Update bug_report.md

Was testing a setup that wasn't used in production, it would
unnecessarily thrash small buffers.

.githooks/pre-commit

@@ -33,4 +33,4 @@ for file in $modified_files; do
   fi
 done;
 
-return ${FAIL}
+exit ${FAIL}

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,19 +1,17 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-title: "[BUG] "
+title: ""
 labels: bug
-assignees: gitbuda, antonio2368
-
 ---
 
-
 **Memgraph version**
 Which version did you use?
 
 **Environment**
 Some information about the environment you are using Memgraph on: operating
-system, how do you connect, with or without docker, which driver etc.
+system, architecture (ARM, x86), how do you connect, are you running queries
+concurrently, with or without docker, which driver, etc.
 
 **Describe the bug**
 A clear and concise description of what the bug is.
@@ -22,6 +20,7 @@ A clear and concise description of what the bug is.
 Steps to reproduce the behavior:
 1. Run the following query '...'
 2. Click on '....'
+3. ... IDEALLY: link to the workload info (DATASET & QUERIES) ...
 
 **Expected behavior**
 A clear and concise description of what you expected to happen.
@@ -30,5 +29,17 @@ A clear and concise description of what you expected to happen.
 If applicable, add logs of Memgraph, CLI output or screenshots to help explain
 your problem.
 
+**Data**
+If possible, put a link to the snapshot file. Sharing the data greatly increases
+the chances of reproducing the problem and resolving the issue in the shortest time.
+
 **Additional context**
 Add any other context about the problem here.
+
+**Verification Environment**
+Once we fix it, what do you need to verify the fix?
+Do you need:
+* Plain memgraph package -> for which Linux?
+* Plain memgraph Docker image?
+* Which architecture do you use ARM | x86?
+* Full Memgraph platform?

.github/workflows/daily_benchmark.yaml

@@ -59,7 +59,7 @@ jobs:
           source ve3/bin/activate
           pip install -r requirements.txt
           ./main.py --benchmark-name "macro_benchmark" \
-                    --benchmark-results-path "../../tests/macro_benchmark/.harness_summary" \
+                    --benchmark-results "../../tests/macro_benchmark/.harness_summary" \
                     --github-run-id "${{ github.run_id }}" \
                     --github-run-number "${{ github.run_number }}" \
                     --head-branch-name "${{ env.BRANCH_NAME }}"
@@ -73,6 +73,8 @@ jobs:
 
           ./benchmark.py vendor-native --num-workers-for-benchmark 1 --export-results benchmark_high_write_set_property.json high_write_set_property
 
+          ./benchmark.py vendor-native --num-workers-for-benchmark 12 --export-results cartesian.json cartesian
+
       - name: Upload mgbench results
         run: |
           cd tools/bench-graph-client
@@ -80,19 +82,25 @@ jobs:
           source ve3/bin/activate
           pip install -r requirements.txt
           ./main.py --benchmark-name "mgbench" \
-                    --benchmark-results-path "../../tests/mgbench/benchmark_pokec.json" \
+                    --benchmark-results "../../tests/mgbench/benchmark_pokec.json" \
                     --github-run-id "${{ github.run_id }}" \
                     --github-run-number "${{ github.run_number }}" \
                     --head-branch-name "${{ env.BRANCH_NAME }}"
 
           ./main.py --benchmark-name "supernode" \
-                    --benchmark-results-path "../../tests/mgbench/benchmark_supernode.json" \
+                    --benchmark-results "../../tests/mgbench/benchmark_supernode.json" \
                     --github-run-id "${{ github.run_id }}" \
                     --github-run-number "${{ github.run_number }}" \
                     --head-branch-name "${{ env.BRANCH_NAME }}"
 
           ./main.py --benchmark-name "high_write_set_property" \
-                    --benchmark-results-path "../../tests/mgbench/benchmark_high_write_set_property.json" \
+                    --benchmark-results "../../tests/mgbench/benchmark_high_write_set_property.json" \
+                    --github-run-id "${{ github.run_id }}" \
+                    --github-run-number "${{ github.run_number }}" \
+                    --head-branch-name "${{ env.BRANCH_NAME }}"
+
+          ./main.py --benchmark-name "cartesian" \
+                    --benchmark-results "../../tests/mgbench/cartesian.json" \
                     --github-run-id "${{ github.run_id }}" \
                     --github-run-number "${{ github.run_number }}" \
                     --head-branch-name "${{ env.BRANCH_NAME }}"

.github/workflows/diff.yaml

@@ -43,7 +43,7 @@ jobs:
 
           # Build community binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release -DMG_ENTERPRISE=OFF ..
+          cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DMG_ENTERPRISE=OFF ..
           make -j$THREADS
 
       - name: Run unit tests
@@ -101,7 +101,7 @@ jobs:
             echo ${file}
             if [[ ${file} == *.py ]]; then
               python3 -m black --check --diff ${file}
-              python3 -m isort --check-only --diff ${file}
+              python3 -m isort --profile black --check-only --diff ${file}
             fi
           done
 
@@ -229,6 +229,11 @@ jobs:
           # branches and tags. (default: 1)
           fetch-depth: 0
 
+      - name: Check e2e service dependencies
+        run: |
+          cd tests/e2e
+          ./dependency_check.sh
+
       - name: Build release binaries
         run: |
           # Activate toolchain.
@@ -239,12 +244,14 @@ jobs:
 
           # Build release binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release ..
+          cmake -DCMAKE_BUILD_TYPE=Release ..
           make -j$THREADS
 
       - name: Run GQL Behave tests
         run: |
-          cd tests/gql_behave
+          cd tests
+          ./setup.sh /opt/toolchain-v4/activate
+          cd gql_behave
           ./continuous_integration
 
       - name: Save quality assurance status
@@ -275,11 +282,13 @@ jobs:
       - name: Run stress test (plain)
         run: |
           cd tests/stress
+          source ve3/bin/activate
           ./continuous_integration
 
       - name: Run stress test (SSL)
         run: |
           cd tests/stress
+          source ve3/bin/activate
           ./continuous_integration --use-ssl
 
       - name: Run durability test
@@ -342,7 +351,7 @@ jobs:
           ./init
           # Build only memgraph release binarie.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release ..
+          cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
           make -j$THREADS memgraph
 
       - name: Run Jepsen tests
@@ -410,11 +419,12 @@ jobs:
           source ve3/bin/activate
           pip install -r requirements.txt
           ./main.py --benchmark-name "macro_benchmark" \
-                    --benchmark-results-path "../../tests/macro_benchmark/.harness_summary" \
+                    --benchmark-results "../../tests/macro_benchmark/.harness_summary" \
                     --github-run-id "${{ github.run_id }}" \
                     --github-run-number "${{ github.run_number }}" \
                     --head-branch-name "${{ env.BRANCH_NAME }}"
 
+      # TODO (andi) No need for path flags and for --disk-storage and --in-memory-analytical
       - name: Run mgbench
         run: |
           cd tests/mgbench
@@ -427,7 +437,7 @@ jobs:
           source ve3/bin/activate
           pip install -r requirements.txt
           ./main.py --benchmark-name "mgbench" \
-                    --benchmark-results-path "../../tests/mgbench/benchmark_result.json" \
+                    --benchmark-results "../../tests/mgbench/benchmark_result.json" \
                     --github-run-id "${{ github.run_id }}" \
                     --github-run-number "${{ github.run_number }}" \
                     --head-branch-name "${{ env.BRANCH_NAME }}"

.github/workflows/package_all.yaml

@@ -8,6 +8,13 @@ on:
       memgraph_version:
         description: "Memgraph version to upload as. If empty upload is skipped. Format: 'X.Y.Z'"
         required: false
+      build_type:
+        type: choice
+        description: "Memgraph Build type. Default value is Release."
+        default: 'Release'
+        options:
+          - Release
+          - RelWithDebInfo
 
 jobs:
   centos-7:
@@ -20,7 +27,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package centos-7
+          ./release/package/run.sh package centos-7 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -37,7 +44,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package centos-9
+          ./release/package/run.sh package centos-9 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -54,7 +61,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package debian-10
+          ./release/package/run.sh package debian-10 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -71,7 +78,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package debian-11
+          ./release/package/run.sh package debian-11 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -89,7 +96,7 @@ jobs:
       - name: "Build package"
         run: |
           cd release/package
-          ./run.sh package debian-11 --for-docker
+          ./run.sh package debian-11 ${{ github.event.inputs.build_type }} --for-docker
           ./run.sh docker
       - name: "Upload package"
         uses: actions/upload-artifact@v3
@@ -107,7 +114,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package ubuntu-18.04
+          ./release/package/run.sh package ubuntu-18.04 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -124,7 +131,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package ubuntu-20.04
+          ./release/package/run.sh package ubuntu-20.04 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -141,7 +148,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package ubuntu-22.04
+          ./release/package/run.sh package ubuntu-22.04 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -158,7 +165,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package debian-11 --for-platform
+          ./release/package/run.sh package debian-11 ${{ github.event.inputs.build_type }} --for-platform
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -175,7 +182,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package fedora-36
+          ./release/package/run.sh package fedora-36 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -192,7 +199,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package amzn-2
+          ./release/package/run.sh package amzn-2 ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -209,7 +216,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package debian-11-arm
+          ./release/package/run.sh package debian-11-arm ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:
@@ -226,7 +233,7 @@ jobs:
           fetch-depth: 0 # Required because of release/get_version.py
       - name: "Build package"
         run: |
-          ./release/package/run.sh package ubuntu-22.04-arm
+          ./release/package/run.sh package ubuntu-22.04-arm ${{ github.event.inputs.build_type }}
       - name: "Upload package"
         uses: actions/upload-artifact@v3
         with:

.github/workflows/performance_benchmarks.yaml

@@ -0,0 +1,85 @@
+name: Run performance benchmarks manually
+
+on:
+  workflow_dispatch:
+
+jobs:
+  performance_benchmarks:
+    name: "Performance benchmarks"
+    runs-on: [self-hosted, Linux, X64, Diff, Gen7]
+    env:
+      THREADS: 24
+      MEMGRAPH_ENTERPRISE_LICENSE: ${{ secrets.MEMGRAPH_ENTERPRISE_LICENSE }}
+      MEMGRAPH_ORGANIZATION_NAME: ${{ secrets.MEMGRAPH_ORGANIZATION_NAME }}
+
+    steps:
+      - name: Set up repository
+        uses: actions/checkout@v3
+        with:
+          # Number of commits to fetch. `0` indicates all history for all
+          # branches and tags. (default: 1)
+          fetch-depth: 0
+
+      - name: Build release binaries
+        run: |
+          # Activate toolchain.
+          source /opt/toolchain-v4/activate
+
+          # Initialize dependencies.
+          ./init
+
+          # Build only memgraph release binaries.
+          cd build
+          cmake -DCMAKE_BUILD_TYPE=release ..
+          make -j$THREADS
+
+      - name: Get branch name (merge)
+        if: github.event_name != 'pull_request'
+        shell: bash
+        run: echo "BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/} | tr / -)" >> $GITHUB_ENV
+
+      - name: Get branch name (pull request)
+        if: github.event_name == 'pull_request'
+        shell: bash
+        run: echo "BRANCH_NAME=$(echo ${GITHUB_HEAD_REF} | tr / -)" >> $GITHUB_ENV
+
+      - name: Run benchmarks
+        run: |
+          cd tests/mgbench
+          ./benchmark.py vendor-native --num-workers-for-benchmark 12 --export-results benchmark_result.json pokec/medium/*/*
+
+          ./benchmark.py vendor-native --num-workers-for-benchmark 1 --export-results benchmark_supernode.json supernode
+
+          ./benchmark.py vendor-native --num-workers-for-benchmark 1 --export-results benchmark_high_write_set_property.json high_write_set_property
+
+          ./benchmark.py vendor-native --num-workers-for-benchmark 12 --export-results benchmark_cartesian.json cartesian
+
+      - name: Upload benchmark results
+        run: |
+          cd tools/bench-graph-client
+          virtualenv -p python3 ve3
+          source ve3/bin/activate
+          pip install -r requirements.txt
+          ./main.py --benchmark-name "mgbench" \
+                    --benchmark-results "../../tests/mgbench/benchmark_result.json" \
+                    --github-run-id "${{ github.run_id }}" \
+                    --github-run-number "${{ github.run_number }}" \
+                    --head-branch-name "${{ env.BRANCH_NAME }}"
+
+          ./main.py --benchmark-name "supernode" \
+                    --benchmark-results "../../tests/mgbench/benchmark_supernode.json" \
+                    --github-run-id "${{ github.run_id }}" \
+                    --github-run-number "${{ github.run_number }}" \
+                    --head-branch-name "${{ env.BRANCH_NAME }}"
+
+          ./main.py --benchmark-name "high_write_set_property" \
+                    --benchmark-results "../../tests/mgbench/benchmark_high_write_set_property.json" \
+                    --github-run-id "${{ github.run_id }}" \
+                    --github-run-number "${{ github.run_number }}" \
+                    --head-branch-name "${{ env.BRANCH_NAME }}"
+
+          ./main.py --benchmark-name "cartesian" \
+                    --benchmark-results "../../tests/mgbench/cartesian.json" \
+                    --github-run-id "${{ github.run_id }}" \
+                    --github-run-number "${{ github.run_number }}" \
+                    --head-branch-name "${{ env.BRANCH_NAME }}"

.github/workflows/release_centos8.yaml

@@ -2,6 +2,15 @@ name: Release CentOS 8
 
 on:
   workflow_dispatch:
+    inputs:
+      build_type:
+        type: choice
+        description: "Memgraph Build type. Default value is Release."
+        default: 'Release'
+        options:
+          - Release
+          - RelWithDebInfo
+
   schedule:
     - cron: "0 22 * * *"
 
@@ -31,9 +40,13 @@ jobs:
           # Initialize dependencies.
           ./init
 
+          # Set default build_type to Release
+          INPUT_BUILD_TYPE=${{ github.event.inputs.build_type }}
+          BUILD_TYPE=${INPUT_BUILD_TYPE:-"Release"}
+
           # Build community binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release -DMG_ENTERPRISE=OFF ..
+          cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DMG_ENTERPRISE=OFF ..
           make -j$THREADS
 
       - name: Run unit tests
@@ -188,9 +201,13 @@ jobs:
           # Initialize dependencies.
           ./init
 
+          # Set default build_type to Release
+          INPUT_BUILD_TYPE=${{ github.event.inputs.build_type }}
+          BUILD_TYPE=${INPUT_BUILD_TYPE:-"Release"}
+
           # Build release binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release ..
+          cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE ..
           make -j$THREADS
 
       - name: Create enterprise RPM package
@@ -243,7 +260,9 @@ jobs:
 
       - name: Run GQL Behave tests
         run: |
-          cd tests/gql_behave
+          cd tests
+          ./setup.sh /opt/toolchain-v4/activate
+          cd gql_behave
           ./continuous_integration
 
       - name: Save quality assurance status

.github/workflows/release_debian10.yaml

@@ -2,6 +2,15 @@ name: Release Debian 10
 
 on:
   workflow_dispatch:
+    inputs:
+      build_type:
+        type: choice
+        description: "Memgraph Build type. Default value is Release."
+        default: 'Release'
+        options:
+          - Release
+          - RelWithDebInfo
+
   schedule:
     - cron: "0 22 * * *"
 
@@ -31,9 +40,13 @@ jobs:
           # Initialize dependencies.
           ./init
 
+          # Set default build_type to Release
+          INPUT_BUILD_TYPE=${{ github.event.inputs.build_type }}
+          BUILD_TYPE=${INPUT_BUILD_TYPE:-"Release"}
+
           # Build community binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release -DMG_ENTERPRISE=OFF ..
+          cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DMG_ENTERPRISE=OFF ..
           make -j$THREADS
 
       - name: Run unit tests
@@ -188,9 +201,13 @@ jobs:
           # Initialize dependencies.
           ./init
 
+          # Set default build_type to Release
+          INPUT_BUILD_TYPE=${{ github.event.inputs.build_type }}
+          BUILD_TYPE=${INPUT_BUILD_TYPE:-"Release"}
+
           # Build release binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release ..
+          cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE ..
           make -j$THREADS
 
       - name: Create enterprise DEB package
@@ -242,7 +259,9 @@ jobs:
 
       - name: Run GQL Behave tests
         run: |
-          cd tests/gql_behave
+          cd tests
+          ./setup.sh /opt/toolchain-v4/activate
+          cd gql_behave
           ./continuous_integration
 
       - name: Save quality assurance status
@@ -320,9 +339,14 @@ jobs:
           source /opt/toolchain-v4/activate
           # Initialize dependencies.
           ./init
+
+          # Set default build_type to Release
+          INPUT_BUILD_TYPE=${{ github.event.inputs.build_type }}
+          BUILD_TYPE=${INPUT_BUILD_TYPE:-"Release"}
+
           # Build only memgraph release binary.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release ..
+          cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE ..
           make -j$THREADS memgraph
 
       - name: Run Jepsen tests

.github/workflows/release_ubuntu2004.yaml

@@ -2,6 +2,15 @@ name: Release Ubuntu 20.04
 
 on:
   workflow_dispatch:
+    inputs:
+      build_type:
+        type: choice
+        description: "Memgraph Build type. Default value is Release."
+        default: 'Release'
+        options:
+          - Release
+          - RelWithDebInfo
+
   schedule:
     - cron: "0 22 * * *"
 
@@ -31,9 +40,13 @@ jobs:
           # Initialize dependencies.
           ./init
 
+          # Set default build_type to Release
+          INPUT_BUILD_TYPE=${{ github.event.inputs.build_type }}
+          BUILD_TYPE=${INPUT_BUILD_TYPE:-"Release"}
+
           # Build community binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release -DMG_ENTERPRISE=OFF ..
+          cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DMG_ENTERPRISE=OFF ..
           make -j$THREADS
 
       - name: Run unit tests
@@ -188,9 +201,13 @@ jobs:
           # Initialize dependencies.
           ./init
 
+          # Set default build_type to Release
+          INPUT_BUILD_TYPE=${{ github.event.inputs.build_type }}
+          BUILD_TYPE=${INPUT_BUILD_TYPE:-"Release"}
+
           # Build release binaries.
           cd build
-          cmake -DCMAKE_BUILD_TYPE=release ..
+          cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE ..
           make -j$THREADS
 
       - name: Create enterprise DEB package
@@ -242,7 +259,9 @@ jobs:
 
       - name: Run GQL Behave tests
         run: |
-          cd tests/gql_behave
+          cd tests
+          ./setup.sh /opt/toolchain-v4/activate
+          cd gql_behave
           ./continuous_integration
 
       - name: Save quality assurance status

.gitignore

@@ -16,8 +16,7 @@
 .ycm_extra_conf.pyc
 .temp/
 Testing/
-build
-build/
+/build*/
 release/examples/build
 cmake-build-*
 cmake/DownloadProject/
@@ -61,3 +60,5 @@ src/storage/distributed/rpc/concurrent_id_mapper_rpc_messages.hpp
 src/transactions/distributed/engine_rpc_messages.hpp
 /tests/manual/js/transaction_timeout/package-lock.json
 /tests/manual/js/transaction_timeout/node_modules/
+.vscode/
+src/query/frontend/opencypher/grammar/.antlr/*

.pre-commit-config.yaml

@@ -15,6 +15,7 @@ repos:
     hooks:
       - id: isort
         name: isort (python)
+        args: ["--profile", "black"]
   - repo: https://github.com/pre-commit/mirrors-clang-format
     rev: v13.0.0
     hooks:

CMakeLists.txt

@@ -42,10 +42,6 @@ endif()
 
 project(memgraph LANGUAGES C CXX)
 
-# NOTE: once in a while this needs to be toggled to check headers are
-#       correct and PCH isn't masking any include issues
-set(CMAKE_DISABLE_PRECOMPILE_HEADERS OFF)
-
 #TODO: upgrade to cmake 3.24 + CheckIPOSupported
 #cmake_policy(SET CMP0138 NEW)
 #include(CheckIPOSupported)
@@ -239,7 +235,6 @@ else()
 endif()
 
 # -----------------------------------------------------------------------------
-
 # default build type is debug
 if (NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Debug")

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-<img width="400px" src="https://uploads-ssl.webflow.com/5e7ceb09657a69bdab054b3a/5e7ceb09657a6937ab054bba_Black_Original%20_Logo.png">
+<img src="https://public-assets.memgraph.com/github-readme-images/github-memgraph-repo-banner.png">
 </p>
 
 ---
@@ -141,29 +141,20 @@ guide](https://memgraph.com/docs/memgraph/reference-guide/configuration).
 
 ## :trophy: Contributing
 
-The main purpose of this repository is to continue evolving Memgraph, making it
-faster and easier to use. Development of Memgraph happens in the open on GitHub,
-and we are grateful to the community for contributing bug fixes and
-improvements. Read below to learn how you can take part in improving Memgraph.
+Welcome to the heart of Memgraph development! We're on a mission to supercharge Memgraph, making it faster, more user-friendly, and even more powerful. We owe a big thanks to our fantastic community of contributors who help us fix bugs and bring incredible improvements to life. If you're passionate about databases and open source, here's your chance to make a difference!
+
+### Explore Memgraph Internals
+
+Interested in the nuts and bolts of Memgraph? Our [internals documentation](https://memgraph.notion.site/Memgraph-Internals-12b69132d67a417898972927d6870bd2) is where you can uncover the inner workings of Memgraph's architecture, learn how to build the project from scratch, and discover the secrets of effective contributions. Dive deep into the database!
+
+### Dive into the Contributing Guide
+Ready to jump into the action? Explore our [contributing guide](CONTRIBUTING.md) to get the inside scoop on how we develop Memgraph. It's your roadmap for suggesting bug fixes and enhancements. Contribute your skills and ideas!
 
 ### Code of Conduct
 
-Memgraph has adopted a Code of Conduct that we expect project participants to
-adhere to. Please read [the full text](CODE_OF_CONDUCT.md) so that you can
-understand what actions will and will not be tolerated.
+Our commitment to a respectful and professional community is unwavering. Every participant in Memgraph is expected to adhere to a stringent Code of Conduct. Please carefully review [the complete text](CODE_OF_CONDUCT.md) to gain a comprehensive understanding of the behaviors that are both expected and explicitly prohibited.
 
-### Contributing Guide
-
-Read our [contributing guide](CONTRIBUTING.md) to learn about our development
-process and how to propose bug fixes and improvements.
-
-### Internals
-
-Read our
-[internal](https://memgraph.notion.site/Memgraph-Internals-12b69132d67a417898972927d6870bd2)
-docs to learn more about Memgraph's architecture, how to build the project from
-source and how to start contributing. All information related to the database,
-can be found in the aforementioned docs.
+We maintain a zero-tolerance policy towards any violations. Our shared commitment to this Code of Conduct ensures that Memgraph remains a place where integrity and excellence are paramount.
 
 ### :scroll: License
 

cmake/FindJemalloc.cmake

@@ -1,55 +0,0 @@
-# Try to find jemalloc library
-#
-# Use this module as:
-#   find_package(Jemalloc)
-#
-# or:
-#   find_package(Jemalloc REQUIRED)
-#
-# This will define the following variables:
-#
-#   Jemalloc_FOUND           True if the system has the jemalloc library.
-#   Jemalloc_INCLUDE_DIRS    Include directories needed to use jemalloc.
-#   Jemalloc_LIBRARIES       Libraries needed to link to jemalloc.
-#
-# The following cache variables may also be set:
-#
-# Jemalloc_INCLUDE_DIR     The directory containing jemalloc/jemalloc.h.
-# Jemalloc_LIBRARY         The path to the jemalloc static library.
-
-find_path(Jemalloc_INCLUDE_DIR NAMES jemalloc/jemalloc.h PATH_SUFFIXES include)
-
-find_library(Jemalloc_LIBRARY NAMES libjemalloc.a PATH_SUFFIXES lib)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(Jemalloc
-  FOUND_VAR Jemalloc_FOUND
-  REQUIRED_VARS
-    Jemalloc_LIBRARY
-    Jemalloc_INCLUDE_DIR
-)
-
-if(Jemalloc_FOUND)
-  set(Jemalloc_LIBRARIES ${Jemalloc_LIBRARY})
-  set(Jemalloc_INCLUDE_DIRS ${Jemalloc_INCLUDE_DIR})
-else()
-  if(Jemalloc_FIND_REQUIRED)
-    message(FATAL_ERROR "Cannot find jemalloc!")
-  else()
-    message(WARNING "jemalloc is not found!")
-  endif()
-endif()
-
-if(Jemalloc_FOUND AND NOT TARGET Jemalloc::Jemalloc)
-  add_library(Jemalloc::Jemalloc UNKNOWN IMPORTED)
-  set_target_properties(Jemalloc::Jemalloc
-    PROPERTIES
-      IMPORTED_LOCATION "${Jemalloc_LIBRARY}"
-      INTERFACE_INCLUDE_DIRECTORIES "${Jemalloc_INCLUDE_DIR}"
-  )
-endif()
-
-mark_as_advanced(
-  Jemalloc_INCLUDE_DIR
-  Jemalloc_LIBRARY
-)

cmake/Findjemalloc.cmake

@@ -0,0 +1,67 @@
+# Try to find jemalloc library
+#
+# Use this module as:
+#   find_package(jemalloc)
+#
+# or:
+#   find_package(jemalloc REQUIRED)
+#
+# This will define the following variables:
+#
+#   JEMALLOC_FOUND           True if the system has the jemalloc library.
+#   Jemalloc_INCLUDE_DIRS    Include directories needed to use jemalloc.
+#   Jemalloc_LIBRARIES       Libraries needed to link to jemalloc.
+#
+# The following cache variables may also be set:
+#
+# Jemalloc_INCLUDE_DIR     The directory containing jemalloc/jemalloc.h.
+# Jemalloc_LIBRARY         The path to the jemalloc static library.
+
+
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(jemalloc
+  FOUND_VAR JEMALLOC_FOUND
+  REQUIRED_VARS
+    JEMALLOC_LIBRARY
+    JEMALLOC_INCLUDE_DIR
+)
+
+if(JEMALLOC_INCLUDE_DIR)
+  message(STATUS "Found jemalloc include dir: ${JEMALLOC_INCLUDE_DIR}")
+else()
+  message(WARNING "jemalloc not found!")
+endif()
+
+if(JEMALLOC_LIBRARY)
+  message(STATUS "Found jemalloc library: ${JEMALLOC_LIBRARY}")
+else()
+  message(WARNING "jemalloc library not found!")
+endif()
+
+if(JEMALLOC_FOUND)
+  set(Jemalloc_LIBRARIES ${JEMALLOC_LIBRARY})
+  set(Jemalloc_INCLUDE_DIRS ${JEMALLOC_INCLUDE_DIR})
+else()
+  if(Jemalloc_FIND_REQUIRED)
+    message(FATAL_ERROR "Cannot find jemalloc!")
+  else()
+    message(WARNING "jemalloc is not found!")
+  endif()
+endif()
+
+if(JEMALLOC_FOUND AND NOT TARGET Jemalloc::Jemalloc)
+  message(STATUS "JEMALLOC NOT TARGET")
+
+  add_library(Jemalloc::Jemalloc UNKNOWN IMPORTED)
+  set_target_properties(Jemalloc::Jemalloc
+    PROPERTIES
+      IMPORTED_LOCATION "${JEMALLOC_LIBRARY}"
+      INTERFACE_INCLUDE_DIRECTORIES "${JEMALLOC_INCLUDE_DIR}"
+  )
+endif()
+
+mark_as_advanced(
+  JEMALLOC_INCLUDE_DIR
+  JEMALLOC_LIBRARY
+)

config/flags.yaml

@@ -99,6 +99,10 @@ modifications:
     value: "SNAPSHOT_ISOLATION"
     override: true
 
+  - name: "storage_mode"
+    value: "IN_MEMORY_TRANSACTIONAL"
+    override: true
+
   - name: "allow_load_csv"
     value: "true"
     override: false
@@ -107,6 +111,10 @@ modifications:
     value: "false"
     override: true
 
+  - name: "query_callable_mappings_path"
+    value: "/etc/memgraph/apoc_compatibility_mappings.json"
+    override: true
+
 undocumented:
   - "flag_file"
   - "also_log_to_stderr"

config/mappings.json

@@ -0,0 +1,26 @@
+{
+    "dbms.components": "mgps.components",
+    "apoc.util.validate": "mgps.validate",
+    "db.schema.nodeTypeProperties": "schema.NodeTypeOroperties",
+    "db.schema.relTypeProperties": "schema.RelTypeProperties",
+    "apoc.coll.contains": "collections.contains",
+    "apoc.coll.partition": "collections.partition",
+    "apoc.coll.toSet": "collections.to_set",
+    "apoc.coll.unionAll": "collections.unionAll",
+    "apoc.coll.removeAll": "collections.remove_all",
+    "apoc.coll.union": "collections.union",
+    "apoc.coll.sum": "collections.sum",
+    "apoc.coll.pairs": "collections.pairs",
+    "apoc.map.fromLists": "map.from_lists",
+    "apoc.map.removeKeys": "map.remove_keys",
+    "apoc.map.merge": "map.merge",
+    "apoc.create.nodes": "create.nodes",
+    "apoc.create.removeProperties": "create.remove_properties",
+    "apoc.create.node": "create.node",
+    "apoc.create.removeLabel": "create.remove_label",
+    "apoc.refactor.invert": "refactor.invert",
+    "apoc.refactor.cloneNode": "refactor.clone_node",
+    "apoc.refactor.cloneSubgraph": "refactor.clone_subgraph",
+    "apoc.refactor.cloneSubgraphFromPath": "refactor.clone_subgraph_from_path",
+    "apoc.label.exists": "label.exists"
+}

environment/.gitignore

@@ -1,2 +0,0 @@
-archives
-build

environment/README.md

@@ -1,5 +1,10 @@
 # Memgraph Operating Environments
 
+## Issues related to build toolchain
+
+* GCC 11.2 (toolchain-v4) doesn't compile on Fedora 38, multiple definitions of enum issue
+* spdlog 1.10/11 doesn't work with fmt 10.0.0
+
 ## os
 
 Under the `os` directory, you can find scripts to install all required system

environment/os/amzn-2.sh

@@ -18,7 +18,7 @@ TOOLCHAIN_BUILD_DEPS=(
     curl libcurl-devel # for cmake
     readline-devel # for cmake and llvm
     libffi-devel libxml2-devel # for llvm
-    libedit-devel pcre-devel automake bison # for swig
+    libedit-devel pcre-devel pcre2-devel automake bison # for swig
     file
     openssl-devel
     gmp-devel
@@ -158,9 +158,9 @@ install() {
             continue
         fi
         if [ "$pkg" == nodejs ]; then
-            curl -sL https://rpm.nodesource.com/setup_16.x | bash -
             if ! yum list installed nodejs >/dev/null 2>/dev/null; then
-                yum install -y nodejs
+              yum install https://rpm.nodesource.com/pub_16.x/nodistro/repo/nodesource-release-nodistro-1.noarch.rpm -y
+              yum install nodejs -y --setopt=nodesource-nodejs.module_hotfixes=1
             fi
             continue
         fi
@@ -172,13 +172,6 @@ install() {
             fi
             continue
         fi
-        if [ "$pkg" == nodejs ]; then
-            curl -sL https://rpm.nodesource.com/setup_16.x | bash -
-            if ! yum list installed nodejs >/dev/null 2>/dev/null; then
-                yum install -y nodejs
-            fi
-            continue
-        fi
         if [ "$pkg" == java-11-openjdk ]; then
             amazon-linux-extras install -y java-openjdk11
             continue

environment/os/centos-7.sh

@@ -20,7 +20,7 @@ TOOLCHAIN_BUILD_DEPS=(
     curl # snappy
     readline-devel # cmake and llvm
     libffi-devel libxml2-devel perl-Digest-MD5 # llvm
-    libedit-devel pcre-devel automake bison # swig
+    libedit-devel pcre-devel pcre2-devel automake bison # swig
     file
     openssl-devel
     gmp-devel

environment/os/centos-9.sh

@@ -17,7 +17,7 @@ TOOLCHAIN_BUILD_DEPS=(
     expat-devel xz-devel python3-devel texinfo libbabeltrace-devel # for gdb
     readline-devel # for cmake and llvm
     libffi-devel libxml2-devel # for llvm
-    libedit-devel pcre-devel automake bison # for swig
+    libedit-devel pcre-devel pcre2-devel automake bison # for swig
     file
     openssl-devel
     gmp-devel

environment/os/debian-10.sh

@@ -24,7 +24,7 @@ TOOLCHAIN_BUILD_DEPS=(
     libgmp-dev # for gdb
     gperf # for proxygen
     git # for fbthrift
-    libedit-dev libpcre3-dev automake bison # for swig
+    libedit-dev libpcre2-dev libpcre3-dev automake bison # for swig
 )
 
 TOOLCHAIN_RUN_DEPS=(

environment/os/debian-11-arm.sh

@@ -18,7 +18,7 @@ TOOLCHAIN_BUILD_DEPS=(
     libcurl4-openssl-dev # for cmake
     libreadline-dev # for cmake and llvm
     libffi-dev libxml2-dev # for llvm
-    libedit-dev libpcre3-dev automake bison # for swig
+    libedit-dev libpcre2-dev libpcre3-dev automake bison # for swig
     curl # snappy
     file # for libunwind
     libssl-dev # for libevent

environment/os/debian-11.sh

@@ -18,7 +18,7 @@ TOOLCHAIN_BUILD_DEPS=(
     libcurl4-openssl-dev # for cmake
     libreadline-dev # for cmake and llvm
     libffi-dev libxml2-dev # for llvm
-    libedit-dev libpcre3-dev automake bison # for swig
+    libedit-dev libpcre2-dev libpcre3-dev automake bison # for swig
     curl # snappy
     file # for libunwind
     libssl-dev # for libevent

environment/os/fedora-36.sh

@@ -18,7 +18,7 @@ TOOLCHAIN_BUILD_DEPS=(
     curl libcurl-devel # for cmake
     readline-devel # for cmake and llvm
     libffi-devel libxml2-devel # for llvm
-    libedit-devel pcre-devel automake bison # for swig
+    libedit-devel pcre-devel pcre2-devel automake bison # for swig
     file
     openssl-devel
     gmp-devel

environment/os/fedora-38.sh

@@ -0,0 +1,108 @@
+#!/bin/bash
+
+set -Eeuo pipefail
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+source "$DIR/../util.sh"
+
+check_operating_system "fedora-38"
+check_architecture "x86_64"
+
+TOOLCHAIN_BUILD_DEPS=(
+    coreutils-common gcc gcc-c++ make # generic build tools
+    wget # used for archive download
+    gnupg2 # used for archive signature verification
+    tar gzip bzip2 xz unzip # used for archive unpacking
+    zlib-devel # zlib library used for all builds
+    expat-devel xz-devel python3-devel texinfo libbabeltrace-devel # for gdb
+    curl libcurl-devel # for cmake
+    readline-devel # for cmake and llvm
+    libffi-devel libxml2-devel # for llvm
+    libedit-devel pcre-devel pcre2-devel automake bison # for swig
+    file
+    openssl-devel
+    gmp-devel
+    gperf
+    diffutils
+    libipt libipt-devel # intel
+    patch
+    perl # for openssl
+)
+
+TOOLCHAIN_RUN_DEPS=(
+    make # generic build tools
+    tar gzip bzip2 xz # used for archive unpacking
+    zlib # zlib library used for all builds
+    expat xz-libs python3 # for gdb
+    readline # for cmake and llvm
+    libffi libxml2 # for llvm
+    openssl-devel
+)
+
+MEMGRAPH_BUILD_DEPS=(
+    git # source code control
+    make pkgconf-pkg-config # build system
+    wget # for downloading libs
+    libuuid-devel java-11-openjdk # required by antlr
+    readline-devel # for memgraph console
+    python3-devel # for query modules
+    openssl-devel
+    libseccomp-devel
+    python3 python3-pip python3-virtualenv python3-virtualenvwrapper python3-pyyaml nmap-ncat # for tests
+    libcurl-devel # mg-requests
+    rpm-build rpmlint # for RPM package building
+    doxygen graphviz # source documentation generators
+    which nodejs golang zip unzip java-11-openjdk-devel # for driver tests
+    sbcl # for custom Lisp C++ preprocessing
+    autoconf # for jemalloc code generation
+    libtool  # for protobuf code generation
+)
+
+list() {
+    echo "$1"
+}
+
+check() {
+    if [ -v LD_LIBRARY_PATH ]; then
+      # On Fedora 38 yum/dnf and python11 use newer glibc which is not compatible
+      # with ours, so we need to momentarely disable env
+      local OLD_LD_LIBRARY_PATH=${LD_LIBRARY_PATH}
+      LD_LIBRARY_PATH=""
+    fi
+    local missing=""
+    for pkg in $1; do
+        if ! dnf list installed "$pkg" >/dev/null 2>/dev/null; then
+            missing="$pkg $missing"
+        fi
+    done
+    if [ "$missing" != "" ]; then
+        echo "MISSING PACKAGES: $missing"
+        exit 1
+    fi
+    if [ -v OLD_LD_LIBRARY_PATH ]; then
+      echo "Restoring LD_LIBRARY_PATH..."
+      LD_LIBRARY_PATH=${OLD_LD_LIBRARY_PATH}
+    fi
+}
+
+install() {
+    cd "$DIR"
+    if [ "$EUID" -ne 0 ]; then
+        echo "Please run as root."
+        exit 1
+    fi
+    # If GitHub Actions runner is installed, append LANG to the environment.
+    # Python related tests don't work without the LANG export.
+    if [ -d "/home/gh/actions-runner" ]; then
+        echo "LANG=en_US.utf8" >> /home/gh/actions-runner/.env
+    else
+        echo "NOTE: export LANG=en_US.utf8"
+    fi
+    dnf update -y
+    for pkg in $1; do
+        dnf install -y "$pkg"
+    done
+}
+
+deps=$2"[*]"
+"$1" "${!deps}"

environment/os/ubuntu-18.04.sh

@@ -25,7 +25,7 @@ TOOLCHAIN_BUILD_DEPS=(
     libgmp-dev # for gdb
     gperf # for proxygen
     libssl-dev
-    libedit-dev libpcre3-dev automake bison # swig
+    libedit-dev libpcre2-dev libpcre3-dev automake bison # swig
 )
 
 TOOLCHAIN_RUN_DEPS=(

environment/os/ubuntu-20.04.sh

@@ -24,7 +24,7 @@ TOOLCHAIN_BUILD_DEPS=(
     libgmp-dev # for gdb
     gperf # for proxygen
     libssl-dev
-    libedit-dev libpcre3-dev automake bison # for swig
+    libedit-dev libpcre2-dev libpcre3-dev automake bison # for swig
 )
 
 TOOLCHAIN_RUN_DEPS=(

environment/os/ubuntu-22.04-arm.sh

@@ -24,7 +24,7 @@ TOOLCHAIN_BUILD_DEPS=(
     libgmp-dev # for gdb
     gperf # for proxygen
     libssl-dev
-    libedit-dev libpcre3-dev automake bison # for swig
+    libedit-dev libpcre2-dev libpcre3-dev automake bison # for swig
 )
 
 TOOLCHAIN_RUN_DEPS=(

environment/os/ubuntu-22.04.sh

@@ -24,7 +24,7 @@ TOOLCHAIN_BUILD_DEPS=(
     libgmp-dev # for gdb
     gperf # for proxygen
     libssl-dev
-    libedit-dev libpcre3-dev automake bison # for swig
+    libedit-dev libpcre2-dev libpcre3-dev automake bison # for swig
 )
 
 TOOLCHAIN_RUN_DEPS=(

environment/toolchain/.gitignore

@@ -1 +1,4 @@
+archives
+build
+output
 *.tar.gz

environment/toolchain/v2/build.sh

@@ -7,7 +7,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 CPUS=$( grep -c processor < /proc/cpuinfo )
 cd "$DIR"
 
-source "$DIR/../util.sh"
+source "$DIR/../../util.sh"
 DISTRO="$(operating_system)"
 
 # toolchain version
@@ -30,10 +30,10 @@ LLVM_VERSION=11.0.0
 SWIG_VERSION=4.0.2 # used only for LLVM compilation
 
 # Check for the dependencies.
-echo "ALL BUILD PACKAGES: $($DIR/../os/$DISTRO.sh list TOOLCHAIN_BUILD_DEPS)"
-$DIR/../os/$DISTRO.sh check TOOLCHAIN_BUILD_DEPS
-echo "ALL RUN PACKAGES: $($DIR/../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)"
-$DIR/../os/$DISTRO.sh check TOOLCHAIN_RUN_DEPS
+echo "ALL BUILD PACKAGES: $($DIR/../../os/$DISTRO.sh list TOOLCHAIN_BUILD_DEPS)"
+$DIR/../../os/$DISTRO.sh check TOOLCHAIN_BUILD_DEPS
+echo "ALL RUN PACKAGES: $($DIR/../../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)"
+$DIR/../../os/$DISTRO.sh check TOOLCHAIN_RUN_DEPS
 
 # check installation directory
 NAME=toolchain-v$TOOLCHAIN_VERSION
@@ -442,7 +442,7 @@ In order to be able to run all of these tools you should install the following
 packages:
 
 \`\`\`
-$($DIR/../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)
+$($DIR/../../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)
 \`\`\`
 
 ## Usage

environment/toolchain/v3/build.sh

@@ -7,7 +7,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 CPUS=$( grep -c processor < /proc/cpuinfo )
 cd "$DIR"
 
-source "$DIR/../util.sh"
+source "$DIR/../../util.sh"
 DISTRO="$(operating_system)"
 
 # toolchain version
@@ -31,10 +31,10 @@ LLVM_VERSION_LONG=12.0.1-rc4
 SWIG_VERSION=4.0.2 # used only for LLVM compilation
 
 # Check for the dependencies.
-echo "ALL BUILD PACKAGES: $($DIR/../os/$DISTRO.sh list TOOLCHAIN_BUILD_DEPS)"
-$DIR/../os/$DISTRO.sh check TOOLCHAIN_BUILD_DEPS
-echo "ALL RUN PACKAGES: $($DIR/../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)"
-$DIR/../os/$DISTRO.sh check TOOLCHAIN_RUN_DEPS
+echo "ALL BUILD PACKAGES: $($DIR/../../os/$DISTRO.sh list TOOLCHAIN_BUILD_DEPS)"
+$DIR/../../os/$DISTRO.sh check TOOLCHAIN_BUILD_DEPS
+echo "ALL RUN PACKAGES: $($DIR/../../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)"
+$DIR/../../os/$DISTRO.sh check TOOLCHAIN_RUN_DEPS
 
 # check installation directory
 NAME=toolchain-v$TOOLCHAIN_VERSION
@@ -452,7 +452,7 @@ In order to be able to run all of these tools you should install the following
 packages:
 
 \`\`\`
-$($DIR/../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)
+$($DIR/../../os/$DISTRO.sh list TOOLCHAIN_RUN_DEPS)
 \`\`\`
 
 ## Usage

environment/toolchain/v4/build.sh

@@ -7,7 +7,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 CPUS=$( grep -c processor < /proc/cpuinfo )
 cd "$DIR"
 
-source "$DIR/../util.sh"
+source "$DIR/../../util.sh"
 DISTRO="$(operating_system)"
 
 function log_tool_name () {
@@ -51,17 +51,13 @@ CPPCHECK_VERSION=2.6
 LLVM_VERSION=13.0.0
 SWIG_VERSION=4.0.2 # used only for LLVM compilation
 
-# Set the right env script
-ENV_SCRIPT="$DIR/../os/$DISTRO.sh"
+# Set the right operating system setup script.
+ENV_SCRIPT="$DIR/../../os/$DISTRO.sh"
 if [[ "$for_arm" = true ]]; then
-    ENV_SCRIPT="$DIR/../os/$DISTRO-arm.sh"
+    ENV_SCRIPT="$DIR/../../os/$DISTRO-arm.sh"
 fi
-
-# Check for the toolchain build dependencies.
 echo "ALL BUILD PACKAGES: $(${ENV_SCRIPT} list TOOLCHAIN_BUILD_DEPS)"
 ${ENV_SCRIPT} check TOOLCHAIN_BUILD_DEPS
-
-# Check for the toolchain run dependencies.
 echo "ALL RUN PACKAGES: $(${ENV_SCRIPT} list TOOLCHAIN_RUN_DEPS)"
 ${ENV_SCRIPT} check TOOLCHAIN_RUN_DEPS
 
@@ -658,7 +654,7 @@ In order to be able to run all of these tools you should install the following
 packages:
 
 \`\`\`
-$($DIR/../os/$ENV_SCRIPT.sh list TOOLCHAIN_RUN_DEPS)
+$($DIR/../../os/$ENV_SCRIPT.sh list TOOLCHAIN_RUN_DEPS)
 \`\`\`
 
 ## Usage

environment/toolchain/v4/snappy.patch

@@ -4,7 +4,7 @@ diff -ur a/CMakeLists.txt b/CMakeLists.txt
 @@ -52,9 +52,9 @@
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHs-c-")
    add_definitions(-D_HAS_EXCEPTIONS=0)
- 
+
 -  # Disable RTTI.
 -  string(REGEX REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 -  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-")
@@ -17,7 +17,7 @@ diff -ur a/CMakeLists.txt b/CMakeLists.txt
 @@ -77,9 +77,9 @@
    string(REGEX REPLACE "-fexceptions" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
- 
+
 -  # Disable RTTI.
 -  string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 -  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
@@ -25,5 +25,5 @@ diff -ur a/CMakeLists.txt b/CMakeLists.txt
 +  # string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 +  # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
  endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
- 
+
  # BUILD_SHARED_LIBS is a standard CMake variable, but we declare it here to make

environment/toolchain/v5/clean.sh

@@ -0,0 +1,42 @@
+#!/bin/bash -ex
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+PREFIX=/opt/toolchain-v5
+
+# NOTE: Often times when versions in the build script are changes, something
+# doesn't work. To avoid rebuild of the whole toolchain but rebuild specific
+# lib from 0, just comment specific line under this cript and run it. Don't
+# forget to comment back to avoid unnecessary deletes next time your run this
+# cript.
+
+# rm -rf "$DIR/build"
+# rm -rf "$DIR/output"
+
+# rm -rf "$PREFIX/bin/gcc"
+# rm -rf "$PREFIX/bin/ld.gold"
+# rm -rf "$PREFIX/bin/gdb"
+# rm -rf "$PREFIX/bin/cmake"
+# rm -rf "$PREFIX/bin/clang"
+# rm -rf "$PREFIX/include/bzlib.h"
+# rm -rf "$PREFIX/include/fmt"
+# rm -rf "$PREFIX/include/lz4.h"
+# rm -rf "$PREFIX/include/lzma.h"
+# rm -rf "$PREFIX/include/zlib.h"
+# rm -rf "$PREFIX/include/zstd.h"
+# rm -rf "$PREFIX/include/jemalloc"
+# rm -rf "$PREFIX/include/boost"
+# rm -rf "$PREFIX/include/double-conversion"
+# rm -rf "$PREFIX/include/gflags"
+# rm -rf "$PREFIX/include/libunwind.h"
+# rm -rf "$PREFIX/include/glog"
+# rm -rf "$PREFIX/include/event2"
+# rm -rf "$PREFIX/include/sodium.h"
+# rm -rf "$PREFIX/include/libaio.h"
+# rm -rf "$PREFIX/include/FlexLexer.h"
+# rm -rf "$PREFIX/include/snappy.h"
+# rm -rf "$PREFIX/include/fizz"
+# rm -rf "$PREFIX/include/folly"
+# rm -rf "$PREFIX/include/proxygen"
+# rm -rf "$PREFIX/include/wangle"
+# rm -rf "$PREFIX/include/thrift"
+
+# rm -rf "$PREFIX"

environment/toolchain/v5/folly-2022.01.31.00.patch

@@ -0,0 +1,41 @@
+diff -ur a/folly/CMakeLists.txt b/folly/CMakeLists.txt
+--- a/folly/CMakeLists.txt	2021-12-12 23:10:42.000000000 +0100
++++ b/folly/CMakeLists.txt	2022-02-03 15:19:41.349693134 +0100
+@@ -28,7 +28,6 @@
+ )
+
+ add_subdirectory(experimental/exception_tracer)
+-add_subdirectory(logging/example)
+
+ if (PYTHON_EXTENSIONS)
+   # Create tree of symbolic links in structure required for successful
+diff -ur a/folly/experimental/exception_tracer/ExceptionTracerLib.cpp b/folly/experimental/exception_tracer/ExceptionTracerLib.cpp
+--- a/folly/experimental/exception_tracer/ExceptionTracerLib.cpp	2021-12-12 23:10:42.000000000 +0100
++++ b/folly/experimental/exception_tracer/ExceptionTracerLib.cpp	2022-02-03 15:19:11.003368891 +0100
+@@ -96,6 +96,7 @@
+ #define __builtin_unreachable()
+ #endif
+
++#if 0
+ namespace __cxxabiv1 {
+
+ void __cxa_throw(
+@@ -154,5 +155,5 @@
+ }
+
+ } // namespace std
+-
++#endif
+ #endif // defined(__GLIBCXX__)
+diff -ur a/folly/Portability.h b/folly/Portability.h
+--- a/folly/Portability.h	2021-12-12 23:10:42.000000000 +0100
++++ b/folly/Portability.h	2022-02-03 15:19:11.003368891 +0100
+@@ -566,7 +566,7 @@
+ #define FOLLY_HAS_COROUTINES 0
+ #elif (__cpp_coroutines >= 201703L || __cpp_impl_coroutine >= 201902L) && \
+     (__has_include(<coroutine>) || __has_include(<experimental/coroutine>))
+-#define FOLLY_HAS_COROUTINES 1
++#define FOLLY_HAS_COROUTINES 0
+ // This is mainly to workaround bugs triggered by LTO, when stack allocated
+ // variables in await_suspend end up on a coroutine frame.
+ #define FOLLY_CORO_AWAIT_SUSPEND_NONTRIVIAL_ATTRIBUTES FOLLY_NOINLINE

environment/toolchain/v5/folly-2023.09.25.00.patch

@@ -0,0 +1,26 @@
+diff --git a/folly/CMakeLists.txt b/folly/CMakeLists.txt
+index e0e16df..471131e 100644
+--- a/folly/CMakeLists.txt
++++ b/folly/CMakeLists.txt
+@@ -28,7 +28,7 @@ install(
+ )
+ 
+ add_subdirectory(experimental/exception_tracer)
+-add_subdirectory(logging/example)
++# add_subdirectory(logging/example)
+ 
+ if (PYTHON_EXTENSIONS)
+   # Create tree of symbolic links in structure required for successful
+diff --git a/folly/Portability.h b/folly/Portability.h
+index 365ef1b..42d24b8 100644
+--- a/folly/Portability.h
++++ b/folly/Portability.h
+@@ -560,7 +560,7 @@ constexpr auto kCpplibVer = 0;
+     (defined(__cpp_coroutines) && __cpp_coroutines >= 201703L) ||          \
+     (defined(__cpp_impl_coroutine) && __cpp_impl_coroutine >= 201902L)) && \
+     (__has_include(<coroutine>) || __has_include(<experimental/coroutine>))
+-#define FOLLY_HAS_COROUTINES 1
++#define FOLLY_HAS_COROUTINES 0
+ // This is mainly to workaround bugs triggered by LTO, when stack allocated
+ // variables in await_suspend end up on a coroutine frame.
+ #define FOLLY_CORO_AWAIT_SUSPEND_NONTRIVIAL_ATTRIBUTES FOLLY_NOINLINE

environment/toolchain/v5/snappy.patch

@@ -0,0 +1,29 @@
+diff -ur a/CMakeLists.txt b/CMakeLists.txt
+--- a/CMakeLists.txt	2021-05-05 00:53:34.000000000 +0200
++++ b/CMakeLists.txt	2022-01-27 17:18:34.758302398 +0100
+@@ -52,9 +52,9 @@
+   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHs-c-")
+   add_definitions(-D_HAS_EXCEPTIONS=0)
+
+-  # Disable RTTI.
+-  string(REGEX REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-")
++  # # Disable RTTI.
++  # string(REGEX REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
++  # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-")
+ else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+   # Use -Wall for clang and gcc.
+   if(NOT CMAKE_CXX_FLAGS MATCHES "-Wall")
+@@ -77,9 +77,9 @@
+   string(REGEX REPLACE "-fexceptions" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
+
+-  # Disable RTTI.
+-  string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
++  # # Disable RTTI.
++  # string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
++  # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
+ endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+
+ # BUILD_SHARED_LIBS is a standard CMake variable, but we declare it here to make

environment/toolchain/v5/xz_pgp.txt

@@ -0,0 +1,75 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+mQINBEzEOZIBEACxg/IuXERlDB48JBWmF4NxNUuuup1IhJAJyFGFSKh3OGAO2Ard
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+MlVin9BQPTpdA+PpRiJvKJgVDeAFOg==
+=asTC
+-----END PGP PUBLIC KEY BLOCK-----

include/_mgp.hpp

@@ -255,6 +255,21 @@ inline mgp_edge *graph_create_edge(mgp_graph *graph, mgp_vertex *from, mgp_verte
   return MgInvoke<mgp_edge *>(mgp_graph_create_edge, graph, from, to, type, memory);
 }
 
+inline mgp_edge *graph_edge_set_from(struct mgp_graph *graph, struct mgp_edge *e, struct mgp_vertex *new_from,
+                                     mgp_memory *memory) {
+  return MgInvoke<mgp_edge *>(mgp_graph_edge_set_from, graph, e, new_from, memory);
+}
+
+inline mgp_edge *graph_edge_set_to(struct mgp_graph *graph, struct mgp_edge *e, struct mgp_vertex *new_to,
+                                   mgp_memory *memory) {
+  return MgInvoke<mgp_edge *>(mgp_graph_edge_set_to, graph, e, new_to, memory);
+}
+
+inline mgp_edge *graph_edge_change_type(struct mgp_graph *graph, struct mgp_edge *e, struct mgp_edge_type new_type,
+                                        mgp_memory *memory) {
+  return MgInvoke<mgp_edge *>(mgp_graph_edge_change_type, graph, e, new_type, memory);
+}
+
 inline void graph_delete_edge(mgp_graph *graph, mgp_edge *edge) { MgInvokeVoid(mgp_graph_delete_edge, graph, edge); }
 
 inline mgp_vertex *graph_get_vertex_by_id(mgp_graph *g, mgp_vertex_id id, mgp_memory *memory) {
@@ -345,6 +360,8 @@ inline size_t map_size(mgp_map *map) { return MgInvoke<size_t>(mgp_map_size, map
 
 inline mgp_value *map_at(mgp_map *map, const char *key) { return MgInvoke<mgp_value *>(mgp_map_at, map, key); }
 
+inline bool key_exists(mgp_map *map, const char *key) { return MgInvoke<int>(mgp_key_exists, map, key); }
+
 inline const char *map_item_key(mgp_map_item *item) { return MgInvoke<const char *>(mgp_map_item_key, item); }
 
 inline mgp_value *map_item_value(mgp_map_item *item) { return MgInvoke<mgp_value *>(mgp_map_item_value, item); }
@@ -367,6 +384,10 @@ inline mgp_map_item *map_items_iterator_next(mgp_map_items_iterator *it) {
 
 inline mgp_vertex_id vertex_get_id(mgp_vertex *v) { return MgInvoke<mgp_vertex_id>(mgp_vertex_get_id, v); }
 
+inline size_t vertex_get_in_degree(mgp_vertex *v) { return MgInvoke<size_t>(mgp_vertex_get_in_degree, v); }
+
+inline size_t vertex_get_out_degree(mgp_vertex *v) { return MgInvoke<size_t>(mgp_vertex_get_out_degree, v); }
+
 inline mgp_vertex *vertex_copy(mgp_vertex *v, mgp_memory *memory) {
   return MgInvoke<mgp_vertex *>(mgp_vertex_copy, v, memory);
 }
@@ -463,6 +484,8 @@ inline void path_destroy(mgp_path *path) { mgp_path_destroy(path); }
 
 inline void path_expand(mgp_path *path, mgp_edge *edge) { MgInvokeVoid(mgp_path_expand, path, edge); }
 
+inline void path_pop(mgp_path *path) { MgInvokeVoid(mgp_path_pop, path); }
+
 inline size_t path_size(mgp_path *path) { return MgInvoke<size_t>(mgp_path_size, path); }
 
 inline mgp_vertex *path_vertex_at(mgp_path *path, size_t index) {

include/_mgp_mock.py

@@ -333,6 +333,13 @@ class Path:
         self._vertices.append(edge.end_id)
         self._edges.append((edge.start_id, edge.end_id, edge.id))
 
+    def pop(self):
+        if not self._edges:
+            raise IndexError("Path contains no relationships.")
+
+        self._vertices.pop()
+        self._edges.pop()
+
     def vertex_at(self, index: int) -> Vertex:
         return Vertex(self._vertices[index], self._graph)
 

include/mg_procedure.h

@@ -111,6 +111,22 @@ enum mgp_error mgp_global_aligned_alloc(size_t size_in_bytes, size_t alignment,
 /// The behavior is undefined if `ptr` is not a value returned from a prior
 /// mgp_global_alloc() or mgp_global_aligned_alloc().
 void mgp_global_free(void *p);
+
+/// State of the graph database.
+struct mgp_graph;
+
+/// Allocations are tracked only for master thread. If new threads are spawned
+/// inside procedure, by calling following function
+/// you can start tracking allocations for current thread too. This
+/// is important if you need query memory limit to work
+/// for given procedure or per procedure memory limit.
+enum mgp_error mgp_track_current_thread_allocations(struct mgp_graph *graph);
+
+/// Once allocations are tracked for current thread, you need to stop tracking allocations
+/// for given thread, before thread finishes with execution, or is detached.
+/// Otherwise it might result in slowdown of system due to unnecessary tracking of
+/// allocations.
+enum mgp_error mgp_untrack_current_thread_allocations(struct mgp_graph *graph);
 ///@}
 
 /// @name Operations on mgp_value
@@ -482,6 +498,9 @@ enum mgp_error mgp_map_size(struct mgp_map *map, size_t *result);
 /// Result is NULL if no mapping exists.
 enum mgp_error mgp_map_at(struct mgp_map *map, const char *key, struct mgp_value **result);
 
+/// Returns true if key in map.
+enum mgp_error mgp_key_exists(struct mgp_map *map, const char *key, int *result);
+
 /// An item in the mgp_map.
 struct mgp_map_item;
 
@@ -543,6 +562,10 @@ void mgp_path_destroy(struct mgp_path *path);
 /// Return mgp_error::MGP_ERROR_UNABLE_TO_ALLOCATE if unable to allocate memory for path extension.
 enum mgp_error mgp_path_expand(struct mgp_path *path, struct mgp_edge *edge);
 
+/// Remove the last node and the last relationship from the path.
+/// Return mgp_error::MGP_ERROR_OUT_OF_RANGE if the path contains no relationships.
+enum mgp_error mgp_path_pop(struct mgp_path *path);
+
 /// Get the number of edges in a mgp_path.
 /// Current implementation always returns without errors.
 enum mgp_error mgp_path_size(struct mgp_path *path, size_t *result);
@@ -647,6 +670,12 @@ struct mgp_vertex_id {
 /// Get the ID of given vertex.
 enum mgp_error mgp_vertex_get_id(struct mgp_vertex *v, struct mgp_vertex_id *result);
 
+/// Get the in degree of given vertex.
+enum mgp_error mgp_vertex_get_in_degree(struct mgp_vertex *v, size_t *result);
+
+/// Get the out degree of given vertex.
+enum mgp_error mgp_vertex_get_out_degree(struct mgp_vertex *v, size_t *result);
+
 /// Result is non-zero if the vertex can be modified.
 /// The mutability of the vertex is the same as the graph which it is part of. If a vertex is immutable, then edges
 /// cannot be created or deleted, properties and labels cannot be set or removed and all of the returned edges will be
@@ -841,9 +870,6 @@ enum mgp_error mgp_edge_set_properties(struct mgp_edge *e, struct mgp_map *prope
 enum mgp_error mgp_edge_iter_properties(struct mgp_edge *e, struct mgp_memory *memory,
                                         struct mgp_properties_iterator **result);
 
-/// State of the graph database.
-struct mgp_graph;
-
 /// Get the vertex corresponding to given ID, or NULL if no such vertex exists.
 /// Resulting vertex must be freed using mgp_vertex_destroy.
 /// Return mgp_error::MGP_ERROR_UNABLE_TO_ALLOCATE if unable to allocate the vertex.
@@ -882,6 +908,29 @@ enum mgp_error mgp_graph_detach_delete_vertex(struct mgp_graph *graph, struct mg
 enum mgp_error mgp_graph_create_edge(struct mgp_graph *graph, struct mgp_vertex *from, struct mgp_vertex *to,
                                      struct mgp_edge_type type, struct mgp_memory *memory, struct mgp_edge **result);
 
+/// Change edge from vertex
+/// Return mgp_error::MGP_ERROR_IMMUTABLE_OBJECT if `graph` is immutable.
+/// Return mgp_error::MGP_ERROR_UNABLE_TO_ALLOCATE if unable to allocate a mgp_edge.
+/// Return mgp_error::MGP_ERROR_DELETED_OBJECT if `from` or `to` has been deleted.
+/// Return mgp_error::MGP_ERROR_SERIALIZATION_ERROR if `from` or `to` has been modified by another transaction.
+enum mgp_error mgp_graph_edge_set_from(struct mgp_graph *graph, struct mgp_edge *e, struct mgp_vertex *new_from,
+                                       struct mgp_memory *memory, struct mgp_edge **result);
+
+/// Change edge to vertex
+/// Return mgp_error::MGP_ERROR_IMMUTABLE_OBJECT if `graph` is immutable.
+/// Return mgp_error::MGP_ERROR_UNABLE_TO_ALLOCATE if unable to allocate a mgp_edge.
+/// Return mgp_error::MGP_ERROR_DELETED_OBJECT if `from` or `to` has been deleted.
+/// Return mgp_error::MGP_ERROR_SERIALIZATION_ERROR if `from` or `to` has been modified by another transaction.
+enum mgp_error mgp_graph_edge_set_to(struct mgp_graph *graph, struct mgp_edge *e, struct mgp_vertex *new_to,
+                                     struct mgp_memory *memory, struct mgp_edge **result);
+
+/// Change edge type
+/// Return mgp_error::MGP_ERROR_IMMUTABLE_OBJECT if `graph` is immutable.
+/// Return mgp_error::MGP_ERROR_SERIALIZATION_ERROR if `edge`, its source or destination vertex has been modified by
+/// another transaction.
+enum mgp_error mgp_graph_edge_change_type(struct mgp_graph *graph, struct mgp_edge *e, struct mgp_edge_type new_type,
+                                          struct mgp_memory *memory, struct mgp_edge **result);
+
 /// Delete an edge from the graph.
 /// Return mgp_error::MGP_ERROR_IMMUTABLE_OBJECT if `graph` is immutable.
 /// Return mgp_error::MGP_ERROR_SERIALIZATION_ERROR if `edge`, its source or destination vertex has been modified by

include/mgp.hpp

@@ -126,6 +126,12 @@ class MemoryDispatcher final {
     map_.erase(this_id);
   }
 
+  bool IsThisThreadRegistered() noexcept {
+    const auto this_id = std::this_thread::get_id();
+    std::shared_lock lock(mut_);
+    return map_.contains(this_id);
+  }
+
  private:
   std::unordered_map<std::thread::id, mgp_memory *> map_;
   std::shared_mutex mut_;
@@ -136,7 +142,7 @@ class MemoryDispatcher final {
 // header. The use of the 'mgp_memory *memory' pointer is deprecated
 // and will be removed in upcoming releases.
 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
-inline extern MemoryDispatcher mrd{};
+inline MemoryDispatcher mrd{};
 
 // TODO - Once we deprecate this we should remove this
 // and make sure nothing relies on it anymore. This alone
@@ -164,7 +170,7 @@ class MemoryDispatcherGuard final {
 // the mapping instead.
 template <typename Func, typename... Args>
 inline decltype(auto) MemHandlerCallback(Func &&func, Args &&...args) {
-  if (memory) {
+  if (!mrd.IsThisThreadRegistered()) {
     return std::forward<Func>(func)(std::forward<Args>(args)..., memory);
   }
   return std::forward<Func>(func)(std::forward<Args>(args)..., mrd.GetMemoryResource());
@@ -250,6 +256,12 @@ class Graph {
   void DetachDeleteNode(const Node &node);
   /// @brief Creates a relationship of type `type` between nodes `from` and `to` and adds it to the graph.
   Relationship CreateRelationship(const Node &from, const Node &to, const std::string_view type);
+  /// @brief Changes a relationship from node.
+  void SetFrom(Relationship &relationship, const Node &new_from);
+  /// @brief Changes a relationship to node.
+  void SetTo(Relationship &relationship, const Node &new_to);
+  /// @brief Changes the relationship type.
+  void ChangeType(Relationship &relationship, std::string_view new_type);
   /// @brief Deletes a relationship from the graph.
   void DeleteRelationship(const Relationship &relationship);
 
@@ -429,6 +441,12 @@ class Labels {
     friend class Labels;
 
    public:
+    using value_type = Labels;
+    using difference_type = std::ptrdiff_t;
+    using pointer = const Labels *;
+    using reference = const Labels &;
+    using iterator_category = std::forward_iterator_tag;
+
     bool operator==(const Iterator &other) const;
 
     bool operator!=(const Iterator &other) const;
@@ -512,6 +530,12 @@ class List {
     friend class List;
 
    public:
+    using value_type = List;
+    using difference_type = std::ptrdiff_t;
+    using pointer = const List *;
+    using reference = const List &;
+    using iterator_category = std::forward_iterator_tag;
+
     bool operator==(const Iterator &other) const;
 
     bool operator!=(const Iterator &other) const;
@@ -608,6 +632,9 @@ class Map {
   /// @brief Returns the value at the given `key`.
   Value const At(std::string_view key) const;
 
+  /// @brief Returns true if the given `key` exists.
+  bool KeyExists(std::string_view key) const;
+
   class Iterator {
    public:
     friend class Map;
@@ -752,6 +779,12 @@ class Node {
   /// @brief returns the string representation
   const std::string ToString() const;
 
+  /// @brief returns the in degree of a node
+  inline size_t InDegree() const;
+
+  /// @brief returns the out degree of a node
+  inline size_t OutDegree() const;
+
  private:
   mgp_vertex *ptr_;
 };
@@ -858,6 +891,8 @@ class Path {
 
   /// @brief Adds a relationship continuing from the last node on the path.
   void Expand(const Relationship &relationship);
+  /// @brief Removes the last node and the last relationship from the path.
+  void Pop();
 
   /// @exception std::runtime_error Path contains element(s) with unknown value.
   bool operator==(const Path &other) const;
@@ -1985,6 +2020,25 @@ inline Relationship Graph::CreateRelationship(const Node &from, const Node &to,
   return relationship;
 }
 
+inline void Graph::SetFrom(Relationship &relationship, const Node &new_from) {
+  mgp_edge *edge = mgp::MemHandlerCallback(mgp::graph_edge_set_from, graph_, relationship.ptr_, new_from.ptr_);
+  relationship = Relationship(edge);
+  mgp::edge_destroy(edge);
+}
+
+inline void Graph::SetTo(Relationship &relationship, const Node &new_to) {
+  mgp_edge *edge = mgp::MemHandlerCallback(mgp::graph_edge_set_to, graph_, relationship.ptr_, new_to.ptr_);
+  relationship = Relationship(edge);
+  mgp::edge_destroy(edge);
+}
+
+inline void Graph::ChangeType(Relationship &relationship, std::string_view new_type) {
+  mgp_edge *edge = mgp::MemHandlerCallback(mgp::graph_edge_change_type, graph_, relationship.ptr_,
+                                           mgp_edge_type{.name = new_type.data()});
+  relationship = Relationship(edge);
+  mgp::edge_destroy(edge);
+}
+
 inline void Graph::DeleteRelationship(const Relationship &relationship) {
   mgp::graph_delete_edge(graph_, relationship.ptr_);
 }
@@ -2531,6 +2585,8 @@ inline const Value Map::At(std::string_view key) const {
   return Value();
 }
 
+inline bool Map::KeyExists(std::string_view key) const { return mgp::key_exists(ptr_, key.data()); }
+
 inline Map::Iterator::Iterator(mgp_map_items_iterator *map_items_iterator) : map_items_iterator_(map_items_iterator) {
   if (map_items_iterator_ == nullptr) return;
   if (mgp::map_items_iterator_get(map_items_iterator_) == nullptr) {
@@ -2790,6 +2846,10 @@ inline const std::string Node::ToString() const {
   return "(id: " + std::to_string(Id().AsInt()) + labels + ", properties: {" + properties + "})";
 }
 
+inline size_t Node::InDegree() const { return mgp::vertex_get_in_degree(ptr_); }
+
+inline size_t Node::OutDegree() const { return mgp::vertex_get_out_degree(ptr_); }
+
 // Relationship:
 
 inline Relationship::Relationship(mgp_edge *ptr) : ptr_(mgp::MemHandlerCallback(edge_copy, ptr)) {}
@@ -2951,6 +3011,8 @@ inline Relationship Path::GetRelationshipAt(size_t index) const {
 
 inline void Path::Expand(const Relationship &relationship) { mgp::path_expand(ptr_, relationship.ptr_); }
 
+inline void Path::Pop() { mgp::path_pop(ptr_); }
+
 inline bool Path::operator==(const Path &other) const { return util::PathsEqual(ptr_, other.ptr_); }
 
 inline bool Path::operator!=(const Path &other) const { return !(*this == other); }

include/mgp.py

@@ -983,6 +983,24 @@ class Path:
         self._vertices = None
         self._edges = None
 
+    def pop(self):
+        """
+        Remove the last node and the last relationship from the path.
+
+        Raises:
+            InvalidContextError: If using an invalid `Path` instance
+            OutOfRangeError: If the path contains no relationships.
+
+        Examples:
+            ```path.pop()```
+        """
+        if not self.is_valid():
+            raise InvalidContextError()
+        self._path.pop()
+        # Invalidate our cached tuples
+        self._vertices = None
+        self._edges = None
+
     @property
     def vertices(self) -> typing.Tuple[Vertex, ...]:
         """
@@ -1023,6 +1041,10 @@ class Path:
             self._edges = tuple(Edge(self._path.edge_at(i)) for i in range(num_edges))
         return self._edges
 
+    @property
+    def length(self) -> int:
+        return self._path.size()
+
 
 class Record:
     """Represents a record of resulting field values."""

include/mgp_mock.py

@@ -929,6 +929,25 @@ class Path:
         self._vertices = None
         self._edges = None
 
+    def pop(self):
+        """
+        Remove the last node and the last relationship from the path.
+
+        Raises:
+            InvalidContextError: If using an invalid `Path` instance
+            OutOfRangeError: If the path contains no relationships.
+
+        Examples:
+            ```path.pop()```
+        """
+        if not self.is_valid():
+            raise InvalidContextError()
+        self._path.pop()
+
+        # Invalidate cached tuples
+        self._vertices = None
+        self._edges = None
+
     @property
     def vertices(self) -> typing.Tuple[Vertex, ...]:
         """

libs/CMakeLists.txt

@@ -4,7 +4,8 @@ include(GNUInstallDirs)
 
 include(ProcessorCount)
 ProcessorCount(NPROC)
-if (NPROC EQUAL 0)
+
+if(NPROC EQUAL 0)
   set(NPROC 1)
 endif()
 
@@ -12,10 +13,10 @@ find_package(Boost 1.78 REQUIRED)
 find_package(BZip2 1.0.6 REQUIRED)
 find_package(Threads REQUIRED)
 set(GFLAGS_NOTHREADS OFF)
+
 # NOTE: config/generate.py depends on the gflags help XML format.
 find_package(gflags REQUIRED)
 find_package(fmt 8.0.1)
-find_package(Jemalloc REQUIRED)
 find_package(ZLIB 1.2.11 REQUIRED)
 
 set(LIB_DIR ${CMAKE_CURRENT_SOURCE_DIR})
@@ -24,24 +25,27 @@ set(LIB_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 function(import_header_library name include_dir)
   add_library(${name} INTERFACE IMPORTED GLOBAL)
   set_property(TARGET ${name} PROPERTY
-               INTERFACE_INCLUDE_DIRECTORIES ${include_dir})
+    INTERFACE_INCLUDE_DIRECTORIES ${include_dir})
   string(TOUPPER ${name} _upper_name)
   set(${_upper_name}_INCLUDE_DIR ${include_dir} CACHE FILEPATH
-      "Path to ${name} include directory" FORCE)
+    "Path to ${name} include directory" FORCE)
   mark_as_advanced(${_upper_name}_INCLUDE_DIR)
   add_library(lib::${name} ALIAS ${name})
 endfunction(import_header_library)
 
 function(import_library name type location include_dir)
   add_library(${name} ${type} IMPORTED GLOBAL)
-  if (${ARGN})
+
+  if(${ARGN})
     # Optional argument is the name of the external project that we need to
     # depend on.
     add_dependencies(${name} ${ARGN0})
   else()
     add_dependencies(${name} ${name}-proj)
   endif()
+
   set_property(TARGET ${name} PROPERTY IMPORTED_LOCATION ${location})
+
   # We need to create the include directory first in order to be able to add it
   # as an include directory. The header files in the include directory will be
   # generated later during the build process.
@@ -61,29 +65,34 @@ function(add_external_project name)
   set(options NO_C_COMPILER)
   set(one_value_kwargs SOURCE_DIR BUILD_IN_SOURCE)
   set(multi_value_kwargs CMAKE_ARGS DEPENDS INSTALL_COMMAND BUILD_COMMAND
-      CONFIGURE_COMMAND)
+    CONFIGURE_COMMAND)
   cmake_parse_arguments(KW "${options}" "${one_value_kwargs}" "${multi_value_kwargs}" ${ARGN})
   set(source_dir ${CMAKE_CURRENT_SOURCE_DIR}/${name})
-  if (KW_SOURCE_DIR)
+
+  if(KW_SOURCE_DIR)
     set(source_dir ${KW_SOURCE_DIR})
   endif()
+
   set(build_in_source 0)
-  if (KW_BUILD_IN_SOURCE)
+
+  if(KW_BUILD_IN_SOURCE)
     set(build_in_source ${KW_BUILD_IN_SOURCE})
   endif()
-  if (NOT KW_NO_C_COMPILER)
+
+  if(NOT KW_NO_C_COMPILER)
     set(KW_CMAKE_ARGS -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER} ${KW_CMAKE_ARGS})
   endif()
+
   ExternalProject_Add(${name}-proj DEPENDS ${KW_DEPENDS}
-                      PREFIX ${source_dir} SOURCE_DIR ${source_dir}
-                      BUILD_IN_SOURCE ${build_in_source}
-                      CONFIGURE_COMMAND ${KW_CONFIGURE_COMMAND}
-                      CMAKE_ARGS -DCMAKE_BUILD_TYPE=Release
-                                 -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-                                 -DCMAKE_INSTALL_PREFIX=${source_dir}
-                                 ${KW_CMAKE_ARGS}
-                      INSTALL_COMMAND ${KW_INSTALL_COMMAND}
-                      BUILD_COMMAND ${KW_BUILD_COMMAND})
+    PREFIX ${source_dir} SOURCE_DIR ${source_dir}
+    BUILD_IN_SOURCE ${build_in_source}
+    CONFIGURE_COMMAND ${KW_CONFIGURE_COMMAND}
+    CMAKE_ARGS -DCMAKE_BUILD_TYPE=Release
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -DCMAKE_INSTALL_PREFIX=${source_dir}
+    ${KW_CMAKE_ARGS}
+    INSTALL_COMMAND ${KW_INSTALL_COMMAND}
+    BUILD_COMMAND ${KW_BUILD_COMMAND})
 endfunction(add_external_project)
 
 # Calls `add_external_project`, sets NAME_LIBRARY, NAME_INCLUDE_DIR variables
@@ -92,23 +101,34 @@ macro(import_external_library name type library_location include_dir)
   add_external_project(${name} ${ARGN})
   string(TOUPPER ${name} _upper_name)
   set(${_upper_name}_LIBRARY ${library_location} CACHE FILEPATH
-      "Path to ${name} library" FORCE)
+    "Path to ${name} library" FORCE)
   set(${_upper_name}_INCLUDE_DIR ${include_dir} CACHE FILEPATH
-      "Path to ${name} include directory" FORCE)
+    "Path to ${name} include directory" FORCE)
   mark_as_advanced(${_upper_name}_LIBRARY ${_upper_name}_INCLUDE_DIR)
   import_library(${name} ${type} ${${_upper_name}_LIBRARY} ${${_upper_name}_INCLUDE_DIR})
 endmacro(import_external_library)
 
+
+macro(set_path_external_library name type library_location include_dir)
+  string(TOUPPER ${name} _upper_name)
+  set(${_upper_name}_LIBRARY ${library_location} CACHE FILEPATH
+      "Path to ${name} library" FORCE)
+  set(${_upper_name}_INCLUDE_DIR ${include_dir} CACHE FILEPATH
+      "Path to ${name} include directory" FORCE)
+  mark_as_advanced(${name}_LIBRARY ${name}_INCLUDE_DIR)
+endmacro(set_path_external_library)
+
+
 # setup antlr
 import_external_library(antlr4 STATIC
   ${CMAKE_CURRENT_SOURCE_DIR}/antlr4/runtime/Cpp/lib/libantlr4-runtime.a
   ${CMAKE_CURRENT_SOURCE_DIR}/antlr4/runtime/Cpp/include/antlr4-runtime
   SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/antlr4/runtime/Cpp
   CMAKE_ARGS # http://stackoverflow.com/questions/37096062/get-a-basic-c-program-to-compile-using-clang-on-ubuntu-16/38385967#38385967
-             -DWITH_LIBCXX=OFF # because of debian bug
-             -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=true
-             -DCMAKE_CXX_STANDARD=20
-             -DANTLR_BUILD_CPP_TESTS=OFF
+  -DWITH_LIBCXX=OFF # because of debian bug
+  -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=true
+  -DCMAKE_CXX_STANDARD=20
+  -DANTLR_BUILD_CPP_TESTS=OFF
   BUILD_COMMAND $(MAKE) antlr4_static
   INSTALL_COMMAND $(MAKE) install)
 
@@ -116,6 +136,7 @@ import_external_library(antlr4 STATIC
 import_external_library(benchmark STATIC
   ${CMAKE_CURRENT_SOURCE_DIR}/benchmark/${CMAKE_INSTALL_LIBDIR}/libbenchmark.a
   ${CMAKE_CURRENT_SOURCE_DIR}/benchmark/include
+
   # Skip testing. The tests don't compile with Clang 8.
   CMAKE_ARGS -DBENCHMARK_ENABLE_TESTING=OFF)
 
@@ -131,15 +152,15 @@ add_subdirectory(rapidcheck EXCLUDE_FROM_ALL)
 # setup google test
 add_external_project(gtest SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/googletest)
 set(GTEST_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/googletest/include
-    CACHE PATH "Path to gtest and gmock include directory" FORCE)
+  CACHE PATH "Path to gtest and gmock include directory" FORCE)
 set(GMOCK_LIBRARY ${CMAKE_CURRENT_SOURCE_DIR}/googletest/lib/libgmock.a
-    CACHE FILEPATH "Path to gmock library" FORCE)
+  CACHE FILEPATH "Path to gmock library" FORCE)
 set(GMOCK_MAIN_LIBRARY ${CMAKE_CURRENT_SOURCE_DIR}/googletest/lib/libgmock_main.a
-    CACHE FILEPATH "Path to gmock_main library" FORCE)
+  CACHE FILEPATH "Path to gmock_main library" FORCE)
 set(GTEST_LIBRARY ${CMAKE_CURRENT_SOURCE_DIR}/googletest/lib/libgtest.a
-    CACHE FILEPATH "Path to gtest library" FORCE)
+  CACHE FILEPATH "Path to gtest library" FORCE)
 set(GTEST_MAIN_LIBRARY ${CMAKE_CURRENT_SOURCE_DIR}/googletest/lib/libgtest_main.a
-    CACHE FILEPATH "Path to gtest_main library" FORCE)
+  CACHE FILEPATH "Path to gtest_main library" FORCE)
 mark_as_advanced(GTEST_INCLUDE_DIR GMOCK_LIBRARY GMOCK_MAIN_LIBRARY GTEST_LIBRARY GTEST_MAIN_LIBRARY)
 import_library(gtest STATIC ${GTEST_LIBRARY} ${GTEST_INCLUDE_DIR} gtest-proj)
 import_library(gtest_main STATIC ${GTEST_MAIN_LIBRARY} ${GTEST_INCLUDE_DIR} gtest-proj)
@@ -157,10 +178,10 @@ import_external_library(rocksdb STATIC
   ${CMAKE_CURRENT_SOURCE_DIR}/rocksdb/lib/librocksdb.a
   ${CMAKE_CURRENT_SOURCE_DIR}/rocksdb/include
   CMAKE_ARGS -DUSE_RTTI=ON
-             -DWITH_TESTS=OFF
-             -DGFLAGS_NOTHREADS=OFF
-             -DCMAKE_INSTALL_LIBDIR=lib
-             -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=true
+  -DWITH_TESTS=OFF
+  -DGFLAGS_NOTHREADS=OFF
+  -DCMAKE_INSTALL_LIBDIR=lib
+  -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=true
   BUILD_COMMAND $(MAKE) rocksdb)
 
 # Setup libbcrypt
@@ -169,8 +190,8 @@ import_external_library(libbcrypt STATIC
   ${CMAKE_CURRENT_SOURCE_DIR}/libbcrypt
   CONFIGURE_COMMAND sed s/-Wcast-align// -i ${CMAKE_CURRENT_SOURCE_DIR}/libbcrypt/crypt_blowfish/Makefile
   BUILD_COMMAND make -C ${CMAKE_CURRENT_SOURCE_DIR}/libbcrypt
-                     CC=${CMAKE_C_COMPILER}
-                     CXX=${CMAKE_CXX_COMPILER}
+  CC=${CMAKE_C_COMPILER}
+  CXX=${CMAKE_CXX_COMPILER}
   INSTALL_COMMAND true)
 
 # Setup mgclient
@@ -178,16 +199,16 @@ import_external_library(mgclient STATIC
   ${CMAKE_CURRENT_SOURCE_DIR}/mgclient/lib/libmgclient.a
   ${CMAKE_CURRENT_SOURCE_DIR}/mgclient/include
   CMAKE_ARGS -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-             -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-             -DBUILD_TESTING=OFF
-             -DBUILD_CPP_BINDINGS=ON)
+  -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+  -DBUILD_TESTING=OFF
+  -DBUILD_CPP_BINDINGS=ON)
 find_package(OpenSSL REQUIRED)
 target_link_libraries(mgclient INTERFACE ${OPENSSL_LIBRARIES})
 
 add_external_project(mgconsole
   SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/mgconsole
   CMAKE_ARGS
-    -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}
+  -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}
   BUILD_COMMAND $(MAKE) mgconsole)
 
 add_custom_target(mgconsole DEPENDS mgconsole-proj)
@@ -204,14 +225,15 @@ import_external_library(librdkafka STATIC
   ${CMAKE_CURRENT_SOURCE_DIR}/librdkafka/lib/librdkafka.a
   ${CMAKE_CURRENT_SOURCE_DIR}/librdkafka/include
   CMAKE_ARGS -DRDKAFKA_BUILD_STATIC=ON
-             -DRDKAFKA_BUILD_EXAMPLES=OFF
-             -DRDKAFKA_BUILD_TESTS=OFF
-             -DWITH_ZSTD=OFF
-             -DENABLE_LZ4_EXT=OFF
-             -DCMAKE_INSTALL_LIBDIR=lib
-             -DWITH_SSL=ON
-             # If we want SASL, we need to install it on build machines
-             -DWITH_SASL=OFF)
+  -DRDKAFKA_BUILD_EXAMPLES=OFF
+  -DRDKAFKA_BUILD_TESTS=OFF
+  -DWITH_ZSTD=OFF
+  -DENABLE_LZ4_EXT=OFF
+  -DCMAKE_INSTALL_LIBDIR=lib
+  -DWITH_SSL=ON
+
+  # If we want SASL, we need to install it on build machines
+  -DWITH_SASL=OFF)
 target_link_libraries(librdkafka INTERFACE ${OPENSSL_LIBRARIES} ZLIB::ZLIB)
 
 import_library(librdkafka++ STATIC
@@ -232,24 +254,24 @@ import_external_library(pulsar STATIC
   ${CMAKE_CURRENT_SOURCE_DIR}/pulsar/install/include
   BUILD_IN_SOURCE 1
   CONFIGURE_COMMAND cmake pulsar-client-cpp
-                            -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_SOURCE_DIR}/pulsar/install
-                            -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-                            -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-                            -DBUILD_DYNAMIC_LIB=OFF
-                            -DBUILD_STATIC_LIB=ON
-                            -DBUILD_TESTS=OFF
-                            -DLINK_STATIC=ON
-                            -DPROTOC_PATH=${PROTOBUF_ROOT}/bin/protoc
-                            -DBOOST_ROOT=${BOOST_ROOT}
-                            -DCMAKE_PREFIX_PATH=${PROTOBUF_ROOT}
-                            -DProtobuf_INCLUDE_DIRS=${PROTOBUF_ROOT}/include
-                            -DBUILD_PYTHON_WRAPPER=OFF
-                            -DBUILD_PERF_TOOLS=OFF
-                            -DUSE_LOG4CXX=OFF
- BUILD_COMMAND $(MAKE) pulsarStaticWithDeps)
+  -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_SOURCE_DIR}/pulsar/install
+  -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+  -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+  -DBUILD_DYNAMIC_LIB=OFF
+  -DBUILD_STATIC_LIB=ON
+  -DBUILD_TESTS=OFF
+  -DLINK_STATIC=ON
+  -DPROTOC_PATH=${PROTOBUF_ROOT}/bin/protoc
+  -DBOOST_ROOT=${BOOST_ROOT}
+  -DCMAKE_PREFIX_PATH=${PROTOBUF_ROOT}
+  -DProtobuf_INCLUDE_DIRS=${PROTOBUF_ROOT}/include
+  -DBUILD_PYTHON_WRAPPER=OFF
+  -DBUILD_PERF_TOOLS=OFF
+  -DUSE_LOG4CXX=OFF
+  BUILD_COMMAND $(MAKE) pulsarStaticWithDeps)
 add_dependencies(pulsar-proj protobuf)
 
-if (${MG_ARCH} STREQUAL "ARM64")
+if(${MG_ARCH} STREQUAL "ARM64")
   set(MG_LIBRDTSC_CMAKE_ARGS -DLIBRDTSC_ARCH_x86=OFF -DLIBRDTSC_ARCH_ARM64=ON)
 endif()
 
@@ -265,3 +287,10 @@ import_header_library(ctre ${CMAKE_CURRENT_SOURCE_DIR})
 # setup absl (cmake sub_directory tolerant)
 set(ABSL_PROPAGATE_CXX_STD ON)
 add_subdirectory(absl EXCLUDE_FROM_ALL)
+
+# set Jemalloc
+set_path_external_library(jemalloc STATIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/jemalloc/lib/libjemalloc.a
+  ${CMAKE_CURRENT_SOURCE_DIR}/jemalloc/include/)
+
+import_header_library(rangev3 ${CMAKE_CURRENT_SOURCE_DIR}/rangev3/include)

libs/setup.sh

@@ -124,6 +124,8 @@ declare -A primary_urls=(
   ["librdtsc"]="http://$local_cache_host/git/librdtsc.git"
   ["ctre"]="http://$local_cache_host/file/hanickadot/compile-time-regular-expressions/v3.7.2/single-header/ctre.hpp"
   ["absl"]="https://$local_cache_host/git/abseil-cpp.git"
+  ["jemalloc"]="https://$local_cache_host/git/jemalloc.git"
+  ["range-v3"]="https://$local_cache_host/git/ericniebler/range-v3.git"
 )
 
 # The goal of secondary urls is to have links to the "source of truth" of
@@ -151,6 +153,8 @@ declare -A secondary_urls=(
   ["librdtsc"]="https://github.com/gabrieleara/librdtsc.git"
   ["ctre"]="https://raw.githubusercontent.com/hanickadot/compile-time-regular-expressions/v3.7.2/single-header/ctre.hpp"
   ["absl"]="https://github.com/abseil/abseil-cpp.git"
+  ["jemalloc"]="https://github.com/jemalloc/jemalloc.git"
+  ["range-v3"]="https://github.com/ericniebler/range-v3.git"
 )
 
 # antlr
@@ -252,3 +256,24 @@ cd ..
 # abseil 20230125.3
 absl_ref="20230125.3"
 repo_clone_try_double "${primary_urls[absl]}" "${secondary_urls[absl]}" "absl" "$absl_ref"
+
+# jemalloc ea6b3e973b477b8061e0076bb257dbd7f3faa756
+JEMALLOC_COMMIT_VERSION="5.2.1"
+repo_clone_try_double "${secondary_urls[jemalloc]}" "${secondary_urls[jemalloc]}" "jemalloc" "$JEMALLOC_COMMIT_VERSION"
+
+# this is hack for cmake in libs to set path, and for FindJemalloc to use Jemalloc_INCLUDE_DIR
+pushd jemalloc
+
+./autogen.sh
+MALLOC_CONF="retain:false,percpu_arena:percpu,oversize_threshold:0,muzzy_decay_ms:5000,dirty_decay_ms:5000" \
+./configure \
+  --disable-cxx \
+  --enable-shared=no --prefix=$working_dir \
+  --with-malloc-conf="retain:false,percpu_arena:percpu,oversize_threshold:0,muzzy_decay_ms:5000,dirty_decay_ms:5000"
+
+make -j$CPUS install
+popd
+
+#range-v3 release-0.12.0
+range_v3_ref="release-0.12.0"
+repo_clone_try_double "${primary_urls[range-v3]}" "${secondary_urls[range-v3]}" "rangev3" "$range_v3_ref"

licenses/BSL.txt

@@ -36,7 +36,7 @@ ADDITIONAL USE GRANT:   You may use the Licensed Work in accordance with the
                         3. using the Licensed Work to create a work or solution
                         which competes (or might reasonably be expected to
                         compete) with the Licensed Work.
-CHANGE DATE:            2027-02-08
+CHANGE DATE:            2027-30-10
 CHANGE LICENSE:         Apache License, Version 2.0
 
 For information about alternative licensing arrangements, please visit: https://memgraph.com/legal.

query_modules/CMakeLists.txt

@@ -40,9 +40,26 @@ install(PROGRAMS $<TARGET_FILE:example_cpp>
 # Also install the source of the example, so user can read it.
 install(FILES example.cpp DESTINATION lib/memgraph/query_modules/src)
 
+add_library(schema SHARED schema.cpp)
+target_include_directories(schema PRIVATE ${CMAKE_SOURCE_DIR}/include)
+target_compile_options(schema PRIVATE -Wall)
+# Strip C++ example in release build.
+if (lower_build_type STREQUAL "release")
+  add_custom_command(TARGET schema POST_BUILD
+                     COMMAND strip -s $<TARGET_FILE:schema>
+                     COMMENT "Stripping symbols and sections from the C++ schema module")
+endif()
+install(PROGRAMS $<TARGET_FILE:schema>
+        DESTINATION lib/memgraph/query_modules
+        RENAME schema.so)
+# Also install the source of the example, so user can read it.
+install(FILES schema.cpp DESTINATION lib/memgraph/query_modules/src)
+
 # Install the Python example and modules
 install(FILES example.py DESTINATION lib/memgraph/query_modules RENAME py_example.py)
 install(FILES graph_analyzer.py DESTINATION lib/memgraph/query_modules)
 install(FILES mgp_networkx.py DESTINATION lib/memgraph/query_modules)
 install(FILES nxalg.py DESTINATION lib/memgraph/query_modules)
 install(FILES wcc.py DESTINATION lib/memgraph/query_modules)
+install(FILES mgps.py DESTINATION lib/memgraph/query_modules)
+install(FILES convert.py DESTINATION lib/memgraph/query_modules)

query_modules/convert.py

@@ -0,0 +1,10 @@
+from json import loads
+
+import mgp
+
+
+@mgp.function
+def str2object(string: str) -> mgp.Any:
+    if string:
+        return loads(string)
+    return None

query_modules/mgps.py

@@ -0,0 +1,8 @@
+import mgp
+
+
+@mgp.read_proc
+def components(
+    context: mgp.ProcCtx,
+) -> mgp.Record(versions=list, edition=str, name=str):
+    return mgp.Record(versions=["5.9.0"], edition="community", name="Memgraph")

query_modules/schema.cpp

@@ -0,0 +1,187 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#include <mgp.hpp>
+
+namespace Schema {
+
+/*NodeTypeProperties and RelTypeProperties constants*/
+constexpr std::string_view kReturnNodeType = "nodeType";
+constexpr std::string_view kProcedureNodeType = "node_type_properties";
+constexpr std::string_view kProcedureRelType = "rel_type_properties";
+constexpr std::string_view kReturnLabels = "nodeLabels";
+constexpr std::string_view kReturnRelType = "relType";
+constexpr std::string_view kReturnPropertyName = "propertyName";
+constexpr std::string_view kReturnPropertyType = "propertyTypes";
+constexpr std::string_view kReturnMandatory = "mandatory";
+
+std::string TypeOf(const mgp::Type &type);
+
+template <typename T>
+void ProcessPropertiesNode(mgp::Record &record, const std::string &type, const mgp::List &labels,
+                           const std::string &propertyName, const T &propertyType, const bool &mandatory);
+
+template <typename T>
+void ProcessPropertiesRel(mgp::Record &record, const std::string_view &type, const std::string &propertyName,
+                          const T &propertyType, const bool &mandatory);
+
+void NodeTypeProperties(mgp_list *args, mgp_graph *memgraph_graph, mgp_result *result, mgp_memory *memory);
+void RelTypeProperties(mgp_list *args, mgp_graph *memgraph_graph, mgp_result *result, mgp_memory *memory);
+}  // namespace Schema
+
+/*we have << operator for type in Cpp API, but in it we return somewhat different strings than I would like in this
+module, so I implemented a small function here*/
+std::string Schema::TypeOf(const mgp::Type &type) {
+  switch (type) {
+    case mgp::Type::Null:
+      return "Null";
+    case mgp::Type::Bool:
+      return "Bool";
+    case mgp::Type::Int:
+      return "Int";
+    case mgp::Type::Double:
+      return "Double";
+    case mgp::Type::String:
+      return "String";
+    case mgp::Type::List:
+      return "List[Any]";
+    case mgp::Type::Map:
+      return "Map[Any]";
+    case mgp::Type::Node:
+      return "Vertex";
+    case mgp::Type::Relationship:
+      return "Edge";
+    case mgp::Type::Path:
+      return "Path";
+    case mgp::Type::Date:
+      return "Date";
+    case mgp::Type::LocalTime:
+      return "LocalTime";
+    case mgp::Type::LocalDateTime:
+      return "LocalDateTime";
+    case mgp::Type::Duration:
+      return "Duration";
+    default:
+      throw mgp::ValueException("Unsupported type");
+  }
+}
+template <typename T>
+void Schema::ProcessPropertiesNode(mgp::Record &record, const std::string &type, const mgp::List &labels,
+                                   const std::string &propertyName, const T &propertyType, const bool &mandatory) {
+  record.Insert(std::string(kReturnNodeType).c_str(), type);
+  record.Insert(std::string(kReturnLabels).c_str(), labels);
+  record.Insert(std::string(kReturnPropertyName).c_str(), propertyName);
+  record.Insert(std::string(kReturnPropertyType).c_str(), propertyType);
+  record.Insert(std::string(kReturnMandatory).c_str(), mandatory);
+}
+
+template <typename T>
+void Schema::ProcessPropertiesRel(mgp::Record &record, const std::string_view &type, const std::string &propertyName,
+                                  const T &propertyType, const bool &mandatory) {
+  record.Insert(std::string(kReturnRelType).c_str(), type);
+  record.Insert(std::string(kReturnPropertyName).c_str(), propertyName);
+  record.Insert(std::string(kReturnPropertyType).c_str(), propertyType);
+  record.Insert(std::string(kReturnMandatory).c_str(), mandatory);
+}
+
+void Schema::NodeTypeProperties(mgp_list *args, mgp_graph *memgraph_graph, mgp_result *result, mgp_memory *memory) {
+  mgp::MemoryDispatcherGuard guard{memory};
+  ;
+  const auto record_factory = mgp::RecordFactory(result);
+  try {
+    const mgp::Graph graph = mgp::Graph(memgraph_graph);
+    for (auto node : graph.Nodes()) {
+      std::string type = "";
+      mgp::List labels = mgp::List();
+      for (auto label : node.Labels()) {
+        labels.AppendExtend(mgp::Value(label));
+        type += ":`" + std::string(label) + "`";
+      }
+
+      if (node.Properties().size() == 0) {
+        auto record = record_factory.NewRecord();
+        ProcessPropertiesNode<std::string>(record, type, labels, "", "", false);
+        continue;
+      }
+
+      for (auto &[key, prop] : node.Properties()) {
+        auto property_type = mgp::List();
+        auto record = record_factory.NewRecord();
+        property_type.AppendExtend(mgp::Value(TypeOf(prop.Type())));
+        ProcessPropertiesNode<mgp::List>(record, type, labels, key, property_type, true);
+      }
+    }
+
+  } catch (const std::exception &e) {
+    record_factory.SetErrorMessage(e.what());
+    return;
+  }
+}
+
+void Schema::RelTypeProperties(mgp_list *args, mgp_graph *memgraph_graph, mgp_result *result, mgp_memory *memory) {
+  mgp::MemoryDispatcherGuard guard{memory};
+  ;
+  const auto record_factory = mgp::RecordFactory(result);
+  try {
+    const mgp::Graph graph = mgp::Graph(memgraph_graph);
+
+    for (auto rel : graph.Relationships()) {
+      std::string type = ":`" + std::string(rel.Type()) + "`";
+      if (rel.Properties().size() == 0) {
+        auto record = record_factory.NewRecord();
+        ProcessPropertiesRel<std::string>(record, type, "", "", false);
+        continue;
+      }
+
+      for (auto &[key, prop] : rel.Properties()) {
+        auto property_type = mgp::List();
+        auto record = record_factory.NewRecord();
+        property_type.AppendExtend(mgp::Value(TypeOf(prop.Type())));
+        ProcessPropertiesRel<mgp::List>(record, type, key, property_type, true);
+      }
+    }
+
+  } catch (const std::exception &e) {
+    record_factory.SetErrorMessage(e.what());
+    return;
+  }
+}
+
+extern "C" int mgp_init_module(struct mgp_module *module, struct mgp_memory *memory) {
+  try {
+    mgp::MemoryDispatcherGuard guard{memory};
+    ;
+
+    AddProcedure(Schema::NodeTypeProperties, std::string(Schema::kProcedureNodeType).c_str(), mgp::ProcedureType::Read,
+                 {},
+                 {mgp::Return(std::string(Schema::kReturnNodeType).c_str(), mgp::Type::String),
+                  mgp::Return(std::string(Schema::kReturnLabels).c_str(), {mgp::Type::List, mgp::Type::String}),
+                  mgp::Return(std::string(Schema::kReturnPropertyName).c_str(), mgp::Type::String),
+                  mgp::Return(std::string(Schema::kReturnPropertyType).c_str(), mgp::Type::Any),
+                  mgp::Return(std::string(Schema::kReturnMandatory).c_str(), mgp::Type::Bool)},
+                 module, memory);
+
+    AddProcedure(Schema::RelTypeProperties, std::string(Schema::kProcedureRelType).c_str(), mgp::ProcedureType::Read,
+                 {},
+                 {mgp::Return(std::string(Schema::kReturnRelType).c_str(), mgp::Type::String),
+                  mgp::Return(std::string(Schema::kReturnPropertyName).c_str(), mgp::Type::String),
+                  mgp::Return(std::string(Schema::kReturnPropertyType).c_str(), mgp::Type::Any),
+                  mgp::Return(std::string(Schema::kReturnMandatory).c_str(), mgp::Type::Bool)},
+                 module, memory);
+
+  } catch (const std::exception &e) {
+    return 1;
+  }
+
+  return 0;
+}
+
+extern "C" int mgp_shutdown_module() { return 0; }

release/debian/conffiles

@@ -1,3 +1,4 @@
 /etc/memgraph/memgraph.conf
+/etc/memgraph/apoc_compatibility_mappings.json
 /etc/memgraph/auth_module/ldap.example.yaml
 /etc/logrotate.d/memgraph

release/memgraph.service

@@ -1,12 +1,27 @@
 [Unit]
 Description=Memgraph: High performance, in-memory, transactional graph database
 
+# Auto-restart config
+#StartLimitIntervalSec=300
+#StartLimitBurst=5
+
 [Service]
 User=memgraph
 Group=memgraph
 ExecStart=/usr/lib/memgraph/memgraph
+
 # Uncomment this if Memgraph needs more time to write the snapshot on exit.
 #TimeoutStopSec=5min
 
+# Auto-restart config
+#Restart=on-failure
+#RestartSec=10s
+
 [Install]
 WantedBy=multi-user.target
+
+# Checks processes' memory usage and force kills it when it is taking up enough
+# memory to make the system unstable / about to crash, e.g. on Debian-based OS:
+# apt install systemd-oomd
+# systemctl enable systemd-oomd
+# systemctl start systemd-oomd

release/package/run.sh

@@ -11,6 +11,12 @@ SUPPORTED_OS=(
     amzn-2
 )
 
+SUPPORTED_BUILD_TYPES=(
+    Debug
+    Release
+    RelWithDebInfo
+)
+
 PROJECT_ROOT="$SCRIPT_DIR/../.."
 TOOLCHAIN_VERSION="toolchain-v4"
 ACTIVATE_TOOLCHAIN="source /opt/${TOOLCHAIN_VERSION}/activate"
@@ -18,14 +24,16 @@ HOST_OUTPUT_DIR="$PROJECT_ROOT/build/output"
 
 print_help () {
     # TODO(gitbuda): Update the release/package/run.sh help
-    echo "$0 init|package|docker|test {os} [--for-docker|--for-platform]"
+    echo "$0 init|package|docker|test {os} {build_type} [--for-docker|--for-platform]"
     echo ""
     echo "    OSs: ${SUPPORTED_OS[*]}"
+    echo "    Build types: ${SUPPORTED_BUILD_TYPES[*]}"
     exit 1
 }
 
 make_package () {
     os="$1"
+    build_type="$2"
 
     build_container="mgbuild_$os"
     echo "Building Memgraph for $os on $build_container..."
@@ -44,10 +52,10 @@ make_package () {
         package_command=" cpack -G DEB --config ../CPackConfig.cmake "
     fi
     telemetry_id_override_flag=""
-    if [[ "$#" -gt 1 ]]; then
-        if [[ "$2" == "--for-docker" ]]; then
+    if [[ "$#" -gt 2 ]]; then
+        if [[ "$3" == "--for-docker" ]]; then
             telemetry_id_override_flag=" -DMG_TELEMETRY_ID_OVERRIDE=DOCKER "
-        elif [[ "$2" == "--for-platform" ]]; then
+        elif [[ "$3" == "--for-platform" ]]; then
             telemetry_id_override_flag=" -DMG_TELEMETRY_ID_OVERRIDE=DOCKER-PLATFORM"
         else
           print_help
@@ -64,6 +72,10 @@ make_package () {
     if [[ "$(git rev-parse --abbrev-ref HEAD)" != "master" ]]; then
         git fetch origin master:master
     fi
+
+    # Ensure we have a clean build directory
+    docker exec "$build_container" rm -rf /memgraph
+    
     docker exec "$build_container" mkdir -p /memgraph
     # TODO(gitbuda): Revisit copying the whole repo -> makese sense under CI.
     docker cp "$PROJECT_ROOT/." "$build_container:/memgraph/"
@@ -89,9 +101,9 @@ make_package () {
     docker exec "$build_container" bash -c "cd $container_build_dir && rm -rf ./*"
     # TODO(gitbuda): cmake fails locally if remote is clone via ssh because of the key -> FIX
     if [[ "$os" =~ "-arm" ]]; then
-        docker exec "$build_container" bash -c "cd $container_build_dir && $ACTIVATE_TOOLCHAIN && cmake -DCMAKE_BUILD_TYPE=release -DMG_ARCH="ARM64" $telemetry_id_override_flag .."
+        docker exec "$build_container" bash -c "cd $container_build_dir && $ACTIVATE_TOOLCHAIN && cmake -DCMAKE_BUILD_TYPE=$build_type -DMG_ARCH="ARM64" $telemetry_id_override_flag .."
     else
-        docker exec "$build_container" bash -c "cd $container_build_dir && $ACTIVATE_TOOLCHAIN && cmake -DCMAKE_BUILD_TYPE=release $telemetry_id_override_flag .."
+        docker exec "$build_container" bash -c "cd $container_build_dir && $ACTIVATE_TOOLCHAIN && cmake -DCMAKE_BUILD_TYPE=$build_type $telemetry_id_override_flag .."
     fi
     # ' is used instead of " because we need to run make within the allowed
     # container resources.
@@ -141,20 +153,34 @@ case "$1" in
 
     package)
         shift 1
-        if [[ "$#" -lt 1 ]]; then
+        if [[ "$#" -lt 2 ]]; then
             print_help
         fi
         os="$1"
-        shift 1
+        build_type="$2"
+        shift 2
         is_os_ok=false
         for supported_os in "${SUPPORTED_OS[@]}"; do
             if [[ "$supported_os" == "${os}" ]]; then
                 is_os_ok=true
+                break
             fi
         done
-        if [[ "$is_os_ok" == true ]]; then
-            make_package "$os" "$@"
+        is_build_type_ok=false
+        for supported_build_type in "${SUPPORTED_BUILD_TYPES[@]}"; do
+            if [[ "$supported_build_type" == "${build_type}" ]]; then
+                is_build_type_ok=true
+                break
+            fi
+        done
+        if [[ "$is_os_ok" == true && "$is_build_type_ok" == true ]]; then
+            make_package "$os" "$build_type" "$@"
         else
+            if [[ "$is_os_ok" == false ]]; then
+                echo "Unsupported OS: $os"
+            elif [[ "$is_build_type_ok" == false ]]; then
+                echo "Unsupported build type: $build_type"
+            fi
             print_help
         fi
     ;;

release/rpm/memgraph.spec.in

@@ -132,6 +132,7 @@ echo "Don't forget to switch to the 'memgraph' user to use Memgraph" || exit 1
 # Override CPACK_RPM_ABSOLUTE_INSTALL_FILES with our %config(noreplace), cpack
 # uses plain %config.
 %config(noreplace) "/etc/memgraph/memgraph.conf"
+%config(noreplace) "/etc/memgraph/apoc_compatibility_mappings.json"
 %config(noreplace) "/etc/memgraph/auth_module/ldap.example.yaml"
 %config(noreplace) "/etc/logrotate.d/memgraph"
 

src/CMakeLists.txt

@@ -18,6 +18,10 @@ add_subdirectory(rpc)
 add_subdirectory(license)
 add_subdirectory(auth)
 add_subdirectory(audit)
+add_subdirectory(dbms)
+add_subdirectory(flags)
+add_subdirectory(distributed)
+add_subdirectory(replication)
 
 string(TOLOWER ${CMAKE_BUILD_TYPE} lower_build_type)
 
@@ -31,19 +35,13 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 # ----------------------------------------------------------------------------
 set(mg_single_node_v2_sources
         memgraph.cpp
-        flags/isolation_level.cpp
-        flags/memory_limit.cpp
-        flags/log_level.cpp
-        flags/general.cpp
-        flags/audit.cpp
-        flags/bolt.cpp
 )
 
 # memgraph main executable
 add_executable(memgraph ${mg_single_node_v2_sources})
 target_include_directories(memgraph PUBLIC ${CMAKE_SOURCE_DIR}/include)
 target_link_libraries(memgraph stdc++fs Threads::Threads
-        mg-telemetry mg-communication mg-memory mg-utils mg-license mg-settings mg-glue)
+        mg-telemetry mg-communication mg-communication-metrics mg-memory mg-utils mg-license mg-settings mg-glue mg-flags)
 
 # NOTE: `include/mg_procedure.syms` describes a pattern match for symbols which
 # should be dynamically exported, so that `dlopen` can correctly link the
@@ -76,7 +74,7 @@ if(lower_build_type STREQUAL "release")
                 COMMENT "Stripping symbols and sections from memgraph")
 endif()
 
-# Generate the configuration file.
+# Generate the configuration file under the build directory.
 add_custom_command(TARGET memgraph POST_BUILD
         COMMAND ${CMAKE_SOURCE_DIR}/config/generate.py
         ${CMAKE_BINARY_DIR}/memgraph
@@ -85,6 +83,11 @@ add_custom_command(TARGET memgraph POST_BUILD
         ${CMAKE_SOURCE_DIR}/config/flags.yaml
         BYPRODUCTS ${CMAKE_BINARY_DIR}/config/memgraph.conf
         COMMENT "Generating memgraph configuration file")
+# Copy the mappings file to the build directory.
+add_custom_command(TARGET memgraph POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy
+        ${CMAKE_SOURCE_DIR}/config/mappings.json
+        ${CMAKE_BINARY_DIR}/config/apoc_compatibility_mappings.json)
 
 # Everything here is under "memgraph" install component.
 set(CMAKE_INSTALL_DEFAULT_COMPONENT_NAME "memgraph")
@@ -120,6 +123,9 @@ install(FILES ${CMAKE_SOURCE_DIR}/include/mgp.hpp
 # Install the config file (must use absolute path).
 install(FILES ${CMAKE_BINARY_DIR}/config/memgraph.conf
         DESTINATION /etc/memgraph RENAME memgraph.conf)
+# Install the mappings file (must use absolute path).
+install(FILES ${CMAKE_BINARY_DIR}/config/apoc_compatibility_mappings.json
+        DESTINATION /etc/memgraph RENAME apoc_compatibility_mappings.json)
 
 # Install logrotate configuration (must use absolute path).
 install(FILES ${CMAKE_SOURCE_DIR}/release/logrotate.conf
@@ -137,7 +143,7 @@ install(CODE "file(MAKE_DIRECTORY \$ENV{DESTDIR}/var/log/memgraph
 # Memgraph CSV Import Tool Executable
 # ----------------------------------------------------------------------------
 add_executable(mg_import_csv mg_import_csv.cpp)
-target_link_libraries(mg_import_csv mg-storage-v2)
+target_link_libraries(mg_import_csv mg-storage-v2 mg-dbms)
 
 # Strip the executable in release build.
 if(lower_build_type STREQUAL "release")

src/auth/exceptions.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -21,5 +21,6 @@ namespace memgraph::auth {
 class AuthException : public utils::BasicException {
  public:
   using utils::BasicException::BasicException;
+  SPECIALIZE_GET_EXCEPTION_NAME(AuthException)
 };
 }  // namespace memgraph::auth

src/communication/CMakeLists.txt

@@ -16,10 +16,12 @@ set(communication_src_files
 
 find_package(Boost REQUIRED)
 
+add_library(mg-communication-metrics STATIC metrics.cpp)
+target_link_libraries(mg-communication-metrics json)
+
 add_library(mg-communication STATIC ${communication_src_files})
-target_link_libraries(mg-communication Boost::headers Threads::Threads mg-utils mg-io mg-auth fmt::fmt gflags)
+target_link_libraries(mg-communication Boost::headers Threads::Threads mg-utils mg-io mg-auth fmt::fmt gflags mg-communication-metrics mg-events)
 
 find_package(OpenSSL REQUIRED)
 target_link_libraries(mg-communication ${OPENSSL_LIBRARIES})
 target_include_directories(mg-communication SYSTEM PUBLIC ${OPENSSL_INCLUDE_DIR})
-target_precompile_headers(mg-communication INTERFACE http/server.hpp <boost/beast/websocket.hpp> bolt/v1/session.hpp)

src/communication/bolt/client.cpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -264,4 +264,5 @@ bool Client::ReadMessageData(Marker marker, Value &ret) {
   }
   return false;
 }
+
 }  // namespace memgraph::communication::bolt

src/communication/bolt/client.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -38,6 +38,7 @@ class FailureResponseException : public utils::BasicException {
       : utils::BasicException{message}, code_{code} {}
 
   const std::string &code() const { return code_; }
+  SPECIALIZE_GET_EXCEPTION_NAME(FailureResponseException)
 
  private:
   std::string code_;
@@ -49,6 +50,7 @@ class FailureResponseException : public utils::BasicException {
 class ClientQueryException : public FailureResponseException {
  public:
   using FailureResponseException::FailureResponseException;
+  SPECIALIZE_GET_EXCEPTION_NAME(ClientQueryException)
 };
 
 /// This exception is thrown whenever a fatal error occurs during query
@@ -57,6 +59,7 @@ class ClientQueryException : public FailureResponseException {
 class ClientFatalException : public utils::BasicException {
  public:
   using utils::BasicException::BasicException;
+  SPECIALIZE_GET_EXCEPTION_NAME(ClientFatalException)
 };
 
 // Internal exception used whenever a communication error occurs. You should
@@ -64,6 +67,7 @@ class ClientFatalException : public utils::BasicException {
 class ServerCommunicationException : public ClientFatalException {
  public:
   ServerCommunicationException() : ClientFatalException("Couldn't communicate with the server!") {}
+  SPECIALIZE_GET_EXCEPTION_NAME(ServerCommunicationException)
 };
 
 // Internal exception used whenever a malformed data error occurs. You should
@@ -71,6 +75,7 @@ class ServerCommunicationException : public ClientFatalException {
 class ServerMalformedDataException : public ClientFatalException {
  public:
   ServerMalformedDataException() : ClientFatalException("The server sent malformed data!") {}
+  SPECIALIZE_GET_EXCEPTION_NAME(ServerMalformedDataException)
 };
 
 /// Structure that is used to return results from an executed query.
@@ -155,4 +160,5 @@ class Client final {
   ChunkedEncoderBuffer<communication::ClientOutputStream> encoder_buffer_{output_stream_};
   ClientEncoder encoder_{encoder_buffer_};
 };
+
 }  // namespace memgraph::communication::bolt

src/communication/bolt/metrics.hpp

@@ -0,0 +1,55 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include "communication/bolt/v1/value.hpp"
+#include "communication/metrics.hpp"
+
+namespace memgraph::communication::bolt {
+
+template <typename TSession>
+inline void RegisterNewSession(TSession &session, Value &metadata) {
+  auto &data = metadata.ValueMap();
+  session.metrics_ = bolt_metrics.Add(data.contains("user_agent") ? data["user_agent"].ValueString() : "unknown",
+                                      fmt::format("{}.{}", session.version_.major, session.version_.minor),
+                                      session.client_supported_bolt_versions_);
+  ++session.metrics_.value()->sessions;
+  auto conn_type = (!data.contains("scheme") || data["scheme"].ValueString() == "none")
+                       ? BoltMetrics::ConnectionType::kAnonymous
+                       : BoltMetrics::ConnectionType::kBasic;
+  ++session.metrics_.value()->connection_types[(int)conn_type];
+}
+
+template <typename TSession>
+inline void TouchNewSession(TSession &session, Value &metadata) {
+  auto &data = metadata.ValueMap();
+  session.metrics_ = bolt_metrics.Add(data.contains("user_agent") ? data["user_agent"].ValueString() : "unknown");
+}
+
+template <typename TSession>
+inline void UpdateNewSession(TSession &session, Value &metadata) {
+  auto &data = metadata.ValueMap();
+  session.metrics_.value()->bolt_v = fmt::format("{}.{}", session.version_.major, session.version_.minor);
+  session.metrics_.value()->supported_bolt_v = session.client_supported_bolt_versions_;
+  ++session.metrics_.value()->sessions;
+  auto conn_type = (!data.contains("scheme") || data["scheme"].ValueString() == "none")
+                       ? BoltMetrics::ConnectionType::kAnonymous
+                       : BoltMetrics::ConnectionType::kBasic;
+  ++session.metrics_.value()->connection_types[(int)conn_type];
+}
+
+template <typename TSession>
+inline void IncrementQueryMetrics(TSession &session) {
+  ++session.metrics_.value()->queries;
+}
+
+}  // namespace memgraph::communication::bolt

src/communication/bolt/v1/exceptions.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -30,6 +30,7 @@ namespace memgraph::communication::bolt {
 class ClientError : public utils::BasicException {
  public:
   using utils::BasicException::BasicException;
+  SPECIALIZE_GET_EXCEPTION_NAME(ClientError)
 };
 
 /**
@@ -67,6 +68,7 @@ class VerboseError : public utils::BasicException {
         code_(fmt::format("Memgraph.{}.{}.{}", ClassificationToString(classification), category, title)) {}
 
   const std::string &code() const noexcept { return code_; }
+  SPECIALIZE_GET_EXCEPTION_NAME(VerboseError)
 
  private:
   std::string ClassificationToString(Classification classification) {

src/communication/bolt/v1/session.hpp

@@ -27,6 +27,7 @@
 #include "communication/bolt/v1/states/handshake.hpp"
 #include "communication/bolt/v1/states/init.hpp"
 #include "communication/bolt/v1/value.hpp"
+#include "communication/metrics.hpp"
 #include "dbms/constants.hpp"
 #include "dbms/global.hpp"
 #include "utils/exceptions.hpp"
@@ -43,6 +44,7 @@ namespace memgraph::communication::bolt {
 class SessionException : public utils::BasicException {
  public:
   using utils::BasicException::BasicException;
+  SPECIALIZE_GET_EXCEPTION_NAME(SessionException)
 };
 
 /**
@@ -54,7 +56,7 @@ class SessionException : public utils::BasicException {
  * @tparam TOutputStream type of output stream that will be used
  */
 template <typename TInputStream, typename TOutputStream>
-class Session : public dbms::SessionInterface {
+class Session {
  public:
   using TEncoder = Encoder<ChunkedEncoderBuffer<TOutputStream>>;
 
@@ -159,6 +161,7 @@ class Session : public dbms::SessionInterface {
           break;
         case State::Idle:
         case State::Result:
+          at_least_one_run_ = true;
           state_ = StateExecutingRun(*this, state_);
           break;
         case State::Error:
@@ -180,6 +183,12 @@ class Session : public dbms::SessionInterface {
     }
   }
 
+  void HandleError() {
+    if (!at_least_one_run_) {
+      spdlog::info("Sudden connection loss. Make sure the client supports Memgraph.");
+    }
+  }
+
   // TODO: Rethink if there is a way to hide some members. At the momement all of them are public.
   TInputStream &input_stream_;
   TOutputStream &output_stream_;
@@ -192,6 +201,7 @@ class Session : public dbms::SessionInterface {
 
   bool handshake_done_{false};
   State state_{State::Handshake};
+  bool at_least_one_run_{false};
 
   struct Version {
     uint8_t major;
@@ -199,9 +209,11 @@ class Session : public dbms::SessionInterface {
   };
 
   Version version_;
+  std::vector<std::string> client_supported_bolt_versions_;
+  std::optional<BoltMetrics::Metrics> metrics_;
 
-  std::string GetDatabaseName() const override = 0;
-  std::string UUID() const final { return session_uuid_; }
+  virtual std::string GetCurrentDB() const = 0;
+  std::string UUID() const { return session_uuid_; }
 
  private:
   void ClientFailureInvalidData() {

src/communication/bolt/v1/states/handlers.hpp

@@ -18,6 +18,7 @@
 #include <string_view>
 #include <vector>
 
+#include "communication/bolt/metrics.hpp"
 #include "communication/bolt/v1/codes.hpp"
 #include "communication/bolt/v1/constants.hpp"
 #include "communication/bolt/v1/exceptions.hpp"
@@ -208,7 +209,14 @@ State HandleRunV1(TSession &session, const State state, const Marker marker) {
 
   DMG_ASSERT(!session.encoder_buffer_.HasData(), "There should be no data to write in this state");
 
-  spdlog::debug("[Run - {}] '{}'", session.GetDatabaseName(), query.ValueString());
+#if MG_ENTERPRISE
+  spdlog::debug("[Run - {}] '{}'", session.GetCurrentDB(), query.ValueString());
+#else
+  spdlog::debug("[Run] '{}'", query.ValueString());
+#endif
+
+  // Increment number of queries in the metrics
+  IncrementQueryMetrics(session);
 
   try {
     // Interpret can throw.
@@ -272,7 +280,14 @@ State HandleRunV4(TSession &session, const State state, const Marker marker) {
     return HandleFailure(session, e);
   }
 
-  spdlog::debug("[Run - {}] '{}'", session.GetDatabaseName(), query.ValueString());
+#if MG_ENTERPRISE
+  spdlog::debug("[Run - {}] '{}'", session.GetCurrentDB(), query.ValueString());
+#else
+  spdlog::debug("[Run] '{}'", query.ValueString());
+#endif
+
+  // Increment number of queries in the metrics
+  IncrementQueryMetrics(session);
 
   try {
     // Interpret can throw.

src/communication/bolt/v1/states/handshake.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -24,6 +24,31 @@
 
 namespace memgraph::communication::bolt {
 
+inline std::vector<std::string> StringifySupportedVersions(uint8_t *data) {
+  std::vector<std::string> res;
+  uint8_t range_i = 1;
+  uint8_t minor_i = 2;
+  uint8_t major_i = 3;
+  uint8_t chunk_size = 4;
+  uint8_t n_chunks = 4;
+  auto stringify_version = [](uint8_t major, uint8_t minor) { return fmt::format("{}.{}", major, minor); };
+  for (uint8_t i = 0; i < n_chunks; ++i) {
+    const uint32_t full_version = *((uint32_t *)data);
+    if (full_version == 0) break;
+    if (data[1] != 0) {  // Supports a range of versions
+      uint8_t range = data[range_i];
+      auto max_minor = data[minor_i];
+      for (uint8_t r = 0; r <= range; ++r) {
+        res.push_back(stringify_version(data[major_i], max_minor - r));
+      }
+    } else {
+      res.push_back(stringify_version(data[major_i], data[minor_i]));
+    }
+    data += chunk_size;
+  }
+  return res;
+}
+
 inline bool CopyProtocolInformationIfSupported(uint16_t version, uint8_t *protocol) {
   const auto *supported_version = std::find(std::begin(kSupportedVersions), std::end(kSupportedVersions), version);
   if (supported_version != std::end(kSupportedVersions)) {
@@ -71,6 +96,8 @@ State StateHandshakeRun(TSession &session) {
   auto dataPosition = session.input_stream_.data() + sizeof(kPreamble);
   uint8_t protocol[4] = {0x00};
 
+  session.client_supported_bolt_versions_ = std::move(StringifySupportedVersions(dataPosition));
+
   for (int i = 0; i < 4 && !protocol[3]; ++i) {
     // If there is an offset defined (e.g. 0x00 0x03 0x03 0x04) the second byte
     // That would enable the client to pick between 4.0 and 4.3 versions

src/communication/bolt/v1/states/init.hpp

@@ -11,6 +11,7 @@
 
 #pragma once
 
+#include <fmt/core.h>
 #include <fmt/format.h>
 #include <optional>
 
@@ -18,6 +19,7 @@
 #include "communication/bolt/v1/state.hpp"
 #include "communication/bolt/v1/value.hpp"
 #include "communication/exceptions.hpp"
+#include "communication/metrics.hpp"
 #include "spdlog/spdlog.h"
 #include "utils/likely.hpp"
 #include "utils/logging.hpp"
@@ -174,7 +176,7 @@ State SendSuccessMessage(TSession &session) {
   // we send a hardcoded value for now.
   std::map<std::string, Value> metadata{{"connection_id", "bolt-1"}};
   if (auto server_name = session.GetServerNameForInit(); server_name) {
-    metadata.insert({"server", *server_name});
+    metadata.insert({"server", std::move(*server_name)});
   }
   bool success_sent = session.encoder_.MessageSuccess(metadata);
   if (!success_sent) {
@@ -201,6 +203,9 @@ State StateInitRunV1(TSession &session, const Marker marker, const Signature sig
     return result.value();
   }
 
+  // Register session to metrics
+  RegisterNewSession(session, *maybeMetadata);
+
   return SendSuccessMessage(session);
 }
 
@@ -227,6 +232,9 @@ State StateInitRunV4(TSession &session, Marker marker, Signature signature) {
     return result.value();
   }
 
+  // Register session to metrics
+  RegisterNewSession(session, *maybeMetadata);
+
   return SendSuccessMessage(session);
 }
 
@@ -247,6 +255,10 @@ State StateInitRunV5(TSession &session, Marker marker, Signature signature) {
     if (SendSuccessMessage(session) == State::Close) {
       return State::Close;
     }
+
+    // Register session to metrics
+    TouchNewSession(session, *maybeMetadata);
+
     // Stay in Init
     return State::Init;
   }
@@ -274,6 +286,10 @@ State StateInitRunV5(TSession &session, Marker marker, Signature signature) {
     if (SendSuccessMessage(session) == State::Close) {
       return State::Close;
     }
+
+    // Register session to metrics
+    UpdateNewSession(session, *maybeMetadata);
+
     return State::Idle;
   }
 

src/communication/bolt/v1/value.hpp

@@ -276,6 +276,7 @@ class ValueException : public utils::BasicException {
  public:
   using utils::BasicException::BasicException;
   ValueException() : BasicException("Incompatible template param and type!") {}
+  SPECIALIZE_GET_EXCEPTION_NAME(ValueException)
 };
 
 /**

src/communication/client.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -15,6 +15,10 @@
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 
+// Centos 7 OpenSSL includes libkrb5 which has brings in macros TRUE and FALSE. undef to prevent issues.
+#undef TRUE
+#undef FALSE
+
 #include "communication/buffer.hpp"
 #include "communication/context.hpp"
 #include "communication/init.hpp"

src/communication/context.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -17,6 +17,10 @@
 #include <openssl/ssl.h>
 #include <boost/asio/ssl/context.hpp>
 
+// Centos 7 OpenSSL includes libkrb5 which has brings in macros TRUE and FALSE. undef to prevent issues.
+#undef TRUE
+#undef FALSE
+
 namespace memgraph::communication {
 
 /**

src/communication/exceptions.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -21,5 +21,6 @@ namespace memgraph::communication {
  */
 class SessionClosedException : public utils::BasicException {
   using utils::BasicException::BasicException;
+  SPECIALIZE_GET_EXCEPTION_NAME(SessionClosedException)
 };
 }  // namespace memgraph::communication

src/communication/metrics.cpp

@@ -0,0 +1,42 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#include "metrics.hpp"
+
+namespace {
+constexpr auto kName = "name";
+constexpr auto kSupportedBoltVersions = "supported_bolt_versions";
+constexpr auto kBoltVersion = "bolt_version";
+constexpr auto kConnectionTypes = "connection_types";
+constexpr auto kSessions = "sessions";
+constexpr auto kQueries = "queries";
+}  // namespace
+namespace memgraph::communication {
+
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+BoltMetrics bolt_metrics;
+
+nlohmann::json BoltMetrics::Info::ToJson() const {
+  nlohmann::json res;
+
+  res[kName] = name;
+  res[kSupportedBoltVersions] = nlohmann::json::array();
+  for (const auto &sbv : supported_bolt_v) {
+    res[kSupportedBoltVersions].push_back(sbv);
+  }
+  res[kBoltVersion] = bolt_v;
+  res[kConnectionTypes] = {{ConnectionTypeStr((ConnectionType)0), connection_types[0].load()},
+                           {ConnectionTypeStr((ConnectionType)1), connection_types[1].load()}};
+  res[kSessions] = sessions.load();
+  res[kQueries] = queries.load();
+  return res;
+}
+}  // namespace memgraph::communication

src/communication/metrics.hpp

@@ -0,0 +1,116 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include <atomic>
+#include <map>
+#include <mutex>
+#include <shared_mutex>
+#include <string>
+#include <vector>
+
+#include <json/json.hpp>
+
+namespace memgraph::communication {
+
+class BoltMetrics {
+ public:
+  enum class ConnectionType { kAnonymous = 0, kBasic, Count };
+  static constexpr std::array<std::string_view, (int)ConnectionType::Count> ct_to_str = {"anonymous", "basic"};
+  static std::string ConnectionTypeStr(ConnectionType type) { return std::string(ct_to_str[(int)type]); }
+  class Metrics;
+
+  struct Info {
+    explicit Info(std::string name) : name(std::move(name)) {}
+    Info(std::string name, std::string bolt_v, std::vector<std::string> supported_bolt_v)
+        : name(std::move(name)), bolt_v(std::move(bolt_v)), supported_bolt_v(std::move(supported_bolt_v)) {}
+
+    const std::string name;                                        //!< Driver name
+    std::string bolt_v;                                            //!< Bolt version used
+    std::vector<std::string> supported_bolt_v;                     //!< Bolt versions supported by the driver
+    std::atomic_int connection_types[(int)ConnectionType::Count];  //!< Authentication used when connecting
+    std::atomic_int sessions;                                      //!< Number of sessions using the same driver
+    std::atomic_int queries;                                       //!< Queries executed by the driver
+
+    nlohmann::json ToJson() const;
+
+   private:
+    friend class Metrics;
+    std::atomic_int concurrent_users;
+  };
+
+  class Metrics {
+    friend class BoltMetrics;
+    explicit Metrics(Info &info) : info_(&info) { ++info_->concurrent_users; }
+
+   public:
+    ~Metrics() {
+      if (info_) --info_->concurrent_users;
+    }
+
+    Metrics(const Metrics &other) : info_(other.info_) { ++info_->concurrent_users; }
+    Metrics(Metrics &&other) noexcept : info_(other.info_) { other.info_ = nullptr; }
+    Metrics &operator=(const Metrics &other) {
+      if (this != &other) {
+        if (info_) --info_->concurrent_users;
+        info_ = other.info_;
+        if (info_) ++info_->concurrent_users;
+      }
+      return *this;
+    }
+    Metrics &operator=(Metrics &&other) noexcept {
+      if (this != &other) {
+        if (info_) --info_->concurrent_users;
+        info_ = other.info_;
+        other.info_ = nullptr;  // Invalidate the source object
+      }
+      return *this;
+    }
+
+    Info *operator->() { return info_; }
+
+    Info *info_;
+  };
+
+  Metrics Add(std::string name) {
+    std::unique_lock<std::mutex> l(mtx);
+    auto key = name;
+    auto [it, _] = info.emplace(std::piecewise_construct, std::forward_as_tuple(std::move(key)),
+                                std::forward_as_tuple(std::move(name)));
+    return Metrics(it->second);
+  }
+
+  Metrics Add(std::string name, std::string bolt_v, std::vector<std::string> supported_bolt_v) {
+    std::unique_lock<std::mutex> l(mtx);
+    auto key = name;
+    auto [it, _] = info.emplace(std::piecewise_construct, std::forward_as_tuple(std::move(key)),
+                                std::forward_as_tuple(std::move(name), std::move(bolt_v), std::move(supported_bolt_v)));
+    return Metrics(it->second);
+  }
+
+  nlohmann::json ToJson() {
+    std::unique_lock<std::mutex> l(mtx);
+    auto res = nlohmann::json::array();
+    for (const auto &[_, client_info] : info) {
+      res.push_back(client_info.ToJson());
+    }
+    return res;
+  }
+
+ private:
+  mutable std::mutex mtx;
+  std::map<std::string, Info> info;
+};
+
+extern BoltMetrics bolt_metrics;
+
+}  // namespace memgraph::communication

src/communication/session.hpp

@@ -22,6 +22,10 @@
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 
+// Centos 7 OpenSSL includes libkrb5 which has brings in macros TRUE and FALSE. undef to prevent issues.
+#undef TRUE
+#undef FALSE
+
 #include "communication/buffer.hpp"
 #include "communication/context.hpp"
 #include "communication/exceptions.hpp"

src/communication/v2/session.hpp

@@ -110,11 +110,7 @@ class WebsocketSession : public std::enable_shared_from_this<WebsocketSession<TS
     return std::shared_ptr<WebsocketSession>(new WebsocketSession(std::forward<Args>(args)...));
   }
 
-#ifdef MG_ENTERPRISE
-  ~WebsocketSession() { session_context_->Delete(session_); }
-#else
   ~WebsocketSession() = default;
-#endif
 
   WebsocketSession(const WebsocketSession &) = delete;
   WebsocketSession &operator=(const WebsocketSession &) = delete;
@@ -171,14 +167,15 @@ class WebsocketSession : public std::enable_shared_from_this<WebsocketSession<TS
       : ws_(std::move(socket)),
         strand_{boost::asio::make_strand(ws_.get_executor())},
         output_stream_([this](const uint8_t *data, size_t len, bool /*have_more*/) { return Write(data, len); }),
-        session_{*session_context, endpoint, input_buffer_.read_end(), &output_stream_},
+        session_{session_context->ic,       endpoint, input_buffer_.read_end(), &output_stream_, session_context->auth,
+#ifdef MG_ENTERPRISE
+                 session_context->audit_log
+#endif
+        },
         session_context_{session_context},
         endpoint_{endpoint},
         remote_endpoint_{ws_.next_layer().socket().remote_endpoint()},
         service_name_{service_name} {
-#ifdef MG_ENTERPRISE
-    session_context_->Register(session_);
-#endif
   }
 
   void OnAccept(boost::beast::error_code ec) {
@@ -286,11 +283,7 @@ class Session final : public std::enable_shared_from_this<Session<TSession, TSes
     return std::shared_ptr<Session>(new Session(std::forward<Args>(args)...));
   }
 
-#ifdef MG_ENTERPRISE
-  ~Session() { session_context_->Delete(session_); }
-#else
   ~Session() = default;
-#endif
 
   Session(const Session &) = delete;
   Session(Session &&) = delete;
@@ -366,17 +359,17 @@ class Session final : public std::enable_shared_from_this<Session<TSession, TSes
       : socket_(CreateSocket(std::move(socket), server_context)),
         strand_{boost::asio::make_strand(GetExecutor())},
         output_stream_([this](const uint8_t *data, size_t len, bool have_more) { return Write(data, len, have_more); }),
-        session_{*session_context, endpoint, input_buffer_.read_end(), &output_stream_},
+        session_{session_context->ic,       endpoint, input_buffer_.read_end(), &output_stream_, session_context->auth,
+#ifdef MG_ENTERPRISE
+                 session_context->audit_log
+#endif
+        },
         session_context_{session_context},
         endpoint_{endpoint},
         remote_endpoint_{GetRemoteEndpoint()},
         service_name_{service_name},
         timeout_seconds_(inactivity_timeout_sec),
         timeout_timer_(GetExecutor()) {
-#ifdef MG_ENTERPRISE
-    // TODO Try to remove Register (see comment at SessionInterface declaration)
-    session_context_->Register(session_);
-#endif
     ExecuteForSocket([](auto &&socket) {
       socket.lowest_layer().set_option(tcp::no_delay(true));                         // enable PSH
       socket.lowest_layer().set_option(boost::asio::socket_base::keep_alive(true));  // enable SO_KEEPALIVE
@@ -413,6 +406,8 @@ class Session final : public std::enable_shared_from_this<Session<TSession, TSes
 
   void OnRead(const boost::system::error_code &ec, const size_t bytes_transferred) {
     if (ec) {
+      // TODO Check if client disconnected
+      session_.HandleError();
       return OnError(ec);
     }
     input_buffer_.write_end()->Written(bytes_transferred);

src/communication/websocket/session.cpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -175,6 +175,11 @@ void Session::OnRead(const boost::beast::error_code ec, const size_t /*bytes_tra
     return;
   }
 
+  if (ec) {
+    LogError(ec, "read");
+    return;
+  }
+
   if (!IsAuthenticated()) {
     auto response = nlohmann::json();
     auto auth_failed = [this, &response](const std::string &message) {

src/communication/websocket/session.hpp

@@ -1,4 +1,4 @@
-// Copyright 2022 Memgraph Ltd.
+// Copyright 2023 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source

src/csv/include/csv/parsing.hpp

@@ -35,6 +35,7 @@ namespace memgraph::csv {
 
 class CsvReadException : public utils::BasicException {
   using utils::BasicException::BasicException;
+  SPECIALIZE_GET_EXCEPTION_NAME(CsvReadException)
 };
 
 class FileCsvSource {

src/dbms/CMakeLists.txt

@@ -0,0 +1,3 @@
+
+add_library(mg-dbms STATIC database.cpp replication_handler.cpp inmemory/replication_handlers.cpp)
+target_link_libraries(mg-dbms mg-utils mg-storage-v2 mg-query)

src/dbms/database.cpp

@@ -0,0 +1,41 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#include "dbms/database.hpp"
+#include "dbms/inmemory/storage_helper.hpp"
+#include "dbms/replication_handler.hpp"
+#include "flags/storage_mode.hpp"
+#include "storage/v2/disk/storage.hpp"
+#include "storage/v2/inmemory/storage.hpp"
+#include "storage/v2/storage_mode.hpp"
+
+template struct memgraph::utils::Gatekeeper<memgraph::dbms::Database>;
+
+namespace memgraph::dbms {
+
+Database::Database(storage::Config config, const replication::ReplicationState &repl_state)
+    : trigger_store_(config.durability.storage_directory / "triggers"),
+      streams_{config.durability.storage_directory / "streams"},
+      plan_cache_{FLAGS_query_plan_cache_max_size},
+      repl_state_(&repl_state) {
+  if (config.storage_mode == memgraph::storage::StorageMode::ON_DISK_TRANSACTIONAL || config.force_on_disk ||
+      utils::DirExists(config.disk.main_storage_directory)) {
+    storage_ = std::make_unique<storage::DiskStorage>(std::move(config));
+  } else {
+    storage_ = dbms::CreateInMemoryStorage(std::move(config), repl_state);
+  }
+}
+
+void Database::SwitchToOnDisk() {
+  storage_ = std::make_unique<memgraph::storage::DiskStorage>(std::move(storage_->config_));
+}
+
+}  // namespace memgraph::dbms

src/dbms/database.hpp

@@ -0,0 +1,173 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include <algorithm>
+#include <filesystem>
+#include <iterator>
+#include <memory>
+#include <optional>
+#include <string_view>
+#include <unordered_map>
+
+#include "query/cypher_query_interpreter.hpp"
+#include "query/stream/streams.hpp"
+#include "query/trigger.hpp"
+#include "storage/v2/storage.hpp"
+#include "utils/gatekeeper.hpp"
+#include "utils/lru_cache.hpp"
+#include "utils/synchronized.hpp"
+
+namespace memgraph::dbms {
+
+struct DatabaseInfo {
+  storage::StorageInfo storage_info;
+  uint64_t triggers;
+  uint64_t streams;
+};
+
+static inline nlohmann::json ToJson(const DatabaseInfo &info) { return ToJson(info.storage_info); }
+
+/**
+ * @brief Class containing everything associated with a single Database
+ *
+ */
+class Database {
+ public:
+  /**
+   * @brief Construct a new Database object
+   *
+   * @param config storage configuration
+   */
+  explicit Database(storage::Config config, const replication::ReplicationState &repl_state);
+
+  /**
+   * @brief Returns the raw storage pointer.
+   * @note Ideally everybody would be using an accessor
+   * TODO: Remove
+   *
+   * @return storage::Storage*
+   */
+  storage::Storage *storage() { return storage_.get(); }
+  storage::Storage const *storage() const { return storage_.get(); }
+
+  /**
+   * @brief Storage's Accessor
+   *
+   * @param override_isolation_level
+   * @return std::unique_ptr<storage::Storage::Accessor>
+   */
+  std::unique_ptr<storage::Storage::Accessor> Access(
+      std::optional<storage::IsolationLevel> override_isolation_level = {}) {
+    return storage_->Access(override_isolation_level, repl_state_->IsMain());
+  }
+
+  std::unique_ptr<storage::Storage::Accessor> UniqueAccess(
+      std::optional<storage::IsolationLevel> override_isolation_level = {}) {
+    return storage_->UniqueAccess(override_isolation_level, repl_state_->IsMain());
+  }
+
+  /**
+   * @brief Unique storage identified (name)
+   *
+   * @return const std::string&
+   */
+  const std::string &id() const { return storage_->id(); }
+
+  /**
+   * @brief Returns the storage configuration
+   *
+   * @return const storage::Config&
+   */
+  const storage::Config &config() const { return storage_->config_; }
+
+  /**
+   * @brief Get the storage mode
+   *
+   * @return storage::StorageMode
+   */
+  storage::StorageMode GetStorageMode() const { return storage_->GetStorageMode(); }
+
+  /**
+   * @brief Get the storage info
+   *
+   * @param force_directory Use the configured directory, do not try to decipher the multi-db version
+   * @return DatabaseInfo
+   */
+  DatabaseInfo GetInfo(bool force_directory = false) const {
+    DatabaseInfo info;
+    info.storage_info = storage_->GetInfo(force_directory);
+    info.triggers = trigger_store_.GetTriggerInfo().size();
+    info.streams = streams_.GetStreamInfo().size();
+    return info;
+  }
+
+  /**
+   * @brief Switch storage to OnDisk
+   *
+   */
+  void SwitchToOnDisk();
+
+  /**
+   * @brief Returns the raw TriggerStore pointer
+   *
+   * @return query::TriggerStore*
+   */
+  query::TriggerStore *trigger_store() { return &trigger_store_; }
+
+  /**
+   * @brief Returns the raw Streams pointer
+   *
+   * @return query::stream::Streams*
+   */
+  query::stream::Streams *streams() { return &streams_; }
+
+  /**
+   * @brief Returns the raw ThreadPool pointer (used for after commit triggers)
+   *
+   * @return utils::ThreadPool*
+   */
+  utils::ThreadPool *thread_pool() { return &after_commit_trigger_pool_; }
+
+  /**
+   * @brief Add task to the after commit trigger thread pool
+   *
+   * @param new_task
+   */
+  void AddTask(std::function<void()> new_task) { after_commit_trigger_pool_.AddTask(std::move(new_task)); }
+
+  /**
+   * @brief Returns the PlanCache vector raw pointer
+   *
+   * @return utils::Synchronized<utils::LRUCache<uint64_t, std::shared_ptr<PlanWrapper>>, utils::RWSpinLock>
+   */
+  query::PlanCacheLRU *plan_cache() { return &plan_cache_; }
+
+ private:
+  std::unique_ptr<storage::Storage> storage_;       //!< Underlying storage
+  query::TriggerStore trigger_store_;               //!< Triggers associated with the storage
+  utils::ThreadPool after_commit_trigger_pool_{1};  //!< Thread pool for executing after commit triggers
+  query::stream::Streams streams_;                  //!< Streams associated with the storage
+
+  // TODO: Move to a better place
+  query::PlanCacheLRU plan_cache_;  //!< Plan cache associated with the storage
+
+  const replication::ReplicationState *repl_state_;
+};
+
+}  // namespace memgraph::dbms
+
+extern template struct memgraph::utils::Gatekeeper<memgraph::dbms::Database>;
+
+namespace memgraph::dbms {
+using DatabaseAccess = memgraph::utils::Gatekeeper<memgraph::dbms::Database>::Accessor;
+}  // namespace memgraph::dbms

src/dbms/database_handler.hpp

@@ -0,0 +1,97 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#ifdef MG_ENTERPRISE
+
+#include <algorithm>
+#include <filesystem>
+#include <iterator>
+#include <memory>
+#include <optional>
+#include <string_view>
+#include <unordered_map>
+
+#include "dbms/database.hpp"
+
+#include "handler.hpp"
+
+namespace memgraph::dbms {
+
+/* NOTE
+ * The Database object is shared. All the higher-level function calls should be protected.
+ * Storage function calls should already be protected; add protection where needed.
+ *
+ * Current implementation uses a handler of Database objects. It owns them and gives
+ * Gatekeeper::Accessor to it. These guarantee that the object won't be
+ * destroyed unless no one is using it.
+ */
+
+/**Config
+ * @brief Multi-database storage handler
+ *
+ */
+class DatabaseHandler : public Handler<Database> {
+ public:
+  using HandlerT = Handler<Database>;
+
+  /**
+   * @brief Generate new storage associated with the passed name.
+   *
+   * @param name Name associating the new interpreter context
+   * @param config Storage configuration
+   * @return HandlerT::NewResult
+   */
+  HandlerT::NewResult New(std::string_view name, storage::Config config,
+                          const replication::ReplicationState &repl_state) {
+    // Control that no one is using the same data directory
+    if (std::any_of(begin(), end(), [&](auto &elem) {
+          auto db_acc = elem.second.access();
+          MG_ASSERT(db_acc.has_value(), "Gatekeeper in invalid state");
+          return db_acc->get()->config().durability.storage_directory == config.durability.storage_directory;
+        })) {
+      spdlog::info("Tried to generate new storage using a claimed directory.");
+      return NewError::EXISTS;
+    }
+    config.name = name;  // Set storage id via config
+    return HandlerT::New(std::piecewise_construct, name, config, repl_state);
+  }
+
+  /**
+   * @brief All currently active storage.
+   *
+   * @return std::vector<std::string>
+   */
+  std::vector<std::string> All() const {
+    std::vector<std::string> res;
+    res.reserve(std::distance(cbegin(), cend()));
+    std::for_each(cbegin(), cend(), [&](const auto &elem) { res.push_back(elem.first); });
+    return res;
+  }
+
+  /**
+   * @brief Get the associated storage's configuration
+   *
+   * @param name
+   * @return std::optional<storage::Config>
+   */
+  std::optional<storage::Config> GetConfig(std::string_view name) {
+    auto db = Get(name);
+    if (db) {
+      return (*db)->config();
+    }
+    return std::nullopt;
+  }
+};
+
+}  // namespace memgraph::dbms
+#endif

src/dbms/dbms_handler.hpp

@@ -0,0 +1,551 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include <algorithm>
+#include <concepts>
+#include <cstdint>
+#include <filesystem>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <ostream>
+#include <stdexcept>
+#include <system_error>
+#include <unordered_map>
+
+#include "auth/auth.hpp"
+#include "constants.hpp"
+#include "dbms/database.hpp"
+#ifdef MG_ENTERPRISE
+#include "dbms/database_handler.hpp"
+#endif
+#include "global.hpp"
+#include "query/config.hpp"
+#include "query/interpreter_context.hpp"
+#include "spdlog/spdlog.h"
+#include "storage/v2/durability/durability.hpp"
+#include "storage/v2/durability/paths.hpp"
+#include "storage/v2/isolation_level.hpp"
+#include "utils/exceptions.hpp"
+#include "utils/file.hpp"
+#include "utils/logging.hpp"
+#include "utils/result.hpp"
+#include "utils/rw_lock.hpp"
+#include "utils/synchronized.hpp"
+#include "utils/uuid.hpp"
+
+namespace memgraph::dbms {
+
+struct Statistics {
+  uint64_t num_vertex;           //!< Sum of vertexes in every database
+  uint64_t num_edges;            //!< Sum of edges in every database
+  uint64_t triggers;             //!< Sum of triggers in every database
+  uint64_t streams;              //!< Sum of streams in every database
+  uint64_t users;                //!< Number of defined users
+  uint64_t num_databases;        //!< Number of isolated databases
+  uint64_t indices;              //!< Sum of indices in every database
+  uint64_t constraints;          //!< Sum of constraints in every database
+  uint64_t storage_modes[3];     //!< Number of databases in each storage mode [IN_MEM_TX, IN_MEM_ANA, ON_DISK_TX]
+  uint64_t isolation_levels[3];  //!< Number of databases in each isolation level [SNAPSHOT, READ_COMM, READ_UNC]
+  uint64_t snapshot_enabled;     //!< Number of databases with snapshots enabled
+  uint64_t wal_enabled;          //!< Number of databases with WAL enabled
+};
+
+static inline nlohmann::json ToJson(const Statistics &stats) {
+  nlohmann::json res;
+
+  res["edges"] = stats.num_edges;
+  res["vertices"] = stats.num_vertex;
+  res["triggers"] = stats.triggers;
+  res["streams"] = stats.streams;
+  res["users"] = stats.users;
+  res["databases"] = stats.num_databases;
+  res["indices"] = stats.indices;
+  res["constraints"] = stats.constraints;
+  res["storage_modes"] = {{storage::StorageModeToString((storage::StorageMode)0), stats.storage_modes[0]},
+                          {storage::StorageModeToString((storage::StorageMode)1), stats.storage_modes[1]},
+                          {storage::StorageModeToString((storage::StorageMode)2), stats.storage_modes[2]}};
+  res["isolation_levels"] = {{storage::IsolationLevelToString((storage::IsolationLevel)0), stats.isolation_levels[0]},
+                             {storage::IsolationLevelToString((storage::IsolationLevel)1), stats.isolation_levels[1]},
+                             {storage::IsolationLevelToString((storage::IsolationLevel)2), stats.isolation_levels[2]}};
+  res["durability"] = {{"snapshot_enabled", stats.snapshot_enabled}, {"WAL_enabled", stats.wal_enabled}};
+
+  return res;
+}
+
+/**
+ * @brief Multi-database session contexts handler.
+ */
+class DbmsHandler {
+ public:
+  using LockT = utils::RWLock;
+#ifdef MG_ENTERPRISE
+
+  using NewResultT = utils::BasicResult<NewError, DatabaseAccess>;
+  using DeleteResult = utils::BasicResult<DeleteError>;
+
+  /**
+   * @brief Initialize the handler.
+   *
+   * @param configs storage configuration
+   * @param auth pointer to the global authenticator
+   * @param recovery_on_startup restore databases (and its content) and authentication data
+   * @param delete_on_drop when dropping delete any associated directories on disk
+   */
+  DbmsHandler(storage::Config config, const replication::ReplicationState &repl_state, auto *auth,
+              bool recovery_on_startup, bool delete_on_drop)
+      : lock_{utils::RWLock::Priority::READ},
+        default_config_{std::move(config)},
+        repl_state_(repl_state),
+        delete_on_drop_(delete_on_drop) {
+    // TODO: Decouple storage config from dbms config
+    // TODO: Save individual db configs inside the kvstore and restore from there
+    storage::UpdatePaths(default_config_, default_config_.durability.storage_directory / "databases");
+    const auto &db_dir = default_config_.durability.storage_directory;
+    const auto durability_dir = db_dir / ".durability";
+    utils::EnsureDirOrDie(db_dir);
+    utils::EnsureDirOrDie(durability_dir);
+    durability_ = std::make_unique<kvstore::KVStore>(durability_dir);
+
+    // Generate the default database
+    MG_ASSERT(!NewDefault_().HasError(), "Failed while creating the default DB.");
+    // Recover previous databases
+    if (recovery_on_startup) {
+      for (const auto &[name, _] : *durability_) {
+        if (name == kDefaultDB) continue;  // Already set
+        spdlog::info("Restoring database {}.", name);
+        MG_ASSERT(!New_(name).HasError(), "Failed while creating database {}.", name);
+        spdlog::info("Database {} restored.", name);
+      }
+    } else {  // Clear databases from the durability list and auth
+      auto locked_auth = auth->Lock();
+      for (const auto &[name, _] : *durability_) {
+        if (name == kDefaultDB) continue;
+        locked_auth->DeleteDatabase(name);
+        durability_->Delete(name);
+      }
+    }
+  }
+#else
+  /**
+   * @brief Initialize the handler. A single database is supported in community edition.
+   *
+   * @param configs storage configuration
+   */
+  DbmsHandler(storage::Config config, const replication::ReplicationState &repl_state)
+      : db_gatekeeper_{[&] {
+                         config.name = kDefaultDB;
+                         return std::move(config);
+                       }(),
+                       repl_state} {}
+#endif
+
+#ifdef MG_ENTERPRISE
+  /**
+   * @brief Create a new Database associated with the "name" database
+   *
+   * @param name name of the database
+   * @return NewResultT context on success, error on failure
+   */
+  NewResultT New(const std::string &name) {
+    std::lock_guard<LockT> wr(lock_);
+    return New_(name, name);
+  }
+
+  /**
+   * @brief Get the context associated with the "name" database
+   *
+   * @param name
+   * @return DatabaseAccess
+   * @throw UnknownDatabaseException if database not found
+   */
+  DatabaseAccess Get(std::string_view name = kDefaultDB) {
+    std::shared_lock<LockT> rd(lock_);
+    return Get_(name);
+  }
+#else
+  /**
+   * @brief Get the context associated with the default database
+   *
+   * @return DatabaseAccess
+   */
+  DatabaseAccess Get() {
+    auto acc = db_gatekeeper_.access();
+    MG_ASSERT(acc, "Failed to get default database!");
+    return *acc;
+  }
+#endif
+
+#ifdef MG_ENTERPRISE
+  /**
+   * @brief Delete database.
+   *
+   * @param db_name database name
+   * @return DeleteResult error on failure
+   */
+  DeleteResult Delete(const std::string &db_name) {
+    std::lock_guard<LockT> wr(lock_);
+    if (db_name == kDefaultDB) {
+      // MSG cannot delete the default db
+      return DeleteError::DEFAULT_DB;
+    }
+
+    const auto storage_path = StorageDir_(db_name);
+    if (!storage_path) return DeleteError::NON_EXISTENT;
+
+    // Check if db exists
+    try {
+      // Low level handlers
+      if (!db_handler_.Delete(db_name)) {
+        return DeleteError::USING;
+      }
+    } catch (utils::BasicException &) {
+      return DeleteError::NON_EXISTENT;
+    }
+
+    // Remove from durability list
+    if (durability_) durability_->Delete(db_name);
+
+    // Delete disk storage
+    if (delete_on_drop_) {
+      std::error_code ec;
+      (void)std::filesystem::remove_all(*storage_path, ec);
+      if (ec) {
+        spdlog::error("Failed to clean disk while deleting database \"{}\".", db_name);
+        defunct_dbs_.emplace(db_name);
+        return DeleteError::DISK_FAIL;
+      }
+    }
+
+    // Delete from defunct_dbs_ (in case a second delete call was successful)
+    defunct_dbs_.erase(db_name);
+
+    return {};  // Success
+  }
+#endif
+
+  /**
+   * @brief Return all active databases.
+   *
+   * @return std::vector<std::string>
+   */
+  std::vector<std::string> All() const {
+#ifdef MG_ENTERPRISE
+    std::shared_lock<LockT> rd(lock_);
+    return db_handler_.All();
+#else
+    return {db_gatekeeper_.access()->get()->id()};
+#endif
+  }
+
+  /**
+   * @brief Return the statistics all databases.
+   *
+   * @return Statistics
+   */
+  Statistics Stats() {
+    Statistics stats{};
+    // TODO: Handle overflow?
+#ifdef MG_ENTERPRISE
+    std::shared_lock<LockT> rd(lock_);
+    for (auto &[_, db_gk] : db_handler_) {
+#else
+    {
+      auto &db_gk = db_gatekeeper_;
+#endif
+      auto db_acc_opt = db_gk.access();
+      if (db_acc_opt) {
+        auto &db_acc = *db_acc_opt;
+        const auto &info = db_acc->GetInfo();
+        const auto &storage_info = info.storage_info;
+        stats.num_vertex += storage_info.vertex_count;
+        stats.num_edges += storage_info.edge_count;
+        stats.triggers += info.triggers;
+        stats.streams += info.streams;
+        ++stats.num_databases;
+        stats.indices += storage_info.label_indices + storage_info.label_property_indices;
+        stats.constraints += storage_info.existence_constraints + storage_info.unique_constraints;
+        ++stats.storage_modes[(int)storage_info.storage_mode];
+        ++stats.isolation_levels[(int)storage_info.isolation_level];
+        stats.snapshot_enabled += storage_info.durability_snapshot_enabled;
+        stats.wal_enabled += storage_info.durability_wal_enabled;
+      }
+    }
+    return stats;
+  }
+
+  /**
+   * @brief Return a vector with all database info.
+   *
+   * @return std::vector<DatabaseInfo>
+   */
+  std::vector<DatabaseInfo> Info() {
+    std::vector<DatabaseInfo> res;
+#ifdef MG_ENTERPRISE
+    std::shared_lock<LockT> rd(lock_);
+    res.reserve(std::distance(db_handler_.cbegin(), db_handler_.cend()));
+    for (auto &[_, db_gk] : db_handler_) {
+#else
+    {
+      auto &db_gk = db_gatekeeper_;
+#endif
+      auto db_acc_opt = db_gk.access();
+      if (db_acc_opt) {
+        auto &db_acc = *db_acc_opt;
+        res.push_back(db_acc->GetInfo());
+      }
+    }
+    return res;
+  }
+
+  /**
+   * @brief Restore triggers for all currently defined databases.
+   * @note: Triggers can execute query procedures, so we need to reload the modules first and then the triggers
+   *
+   * @param ic global InterpreterContext
+   */
+  void RestoreTriggers(query::InterpreterContext *ic) {
+#ifdef MG_ENTERPRISE
+    std::lock_guard<LockT> wr(lock_);
+    for (auto &[_, db_gk] : db_handler_) {
+#else
+    {
+      auto &db_gk = db_gatekeeper_;
+#endif
+      auto db_acc_opt = db_gk.access();
+      if (db_acc_opt) {
+        auto &db_acc = *db_acc_opt;
+        spdlog::debug("Restoring trigger for database \"{}\"", db_acc->id());
+        auto storage_accessor = db_acc->Access();
+        auto dba = memgraph::query::DbAccessor{storage_accessor.get()};
+        db_acc->trigger_store()->RestoreTriggers(&ic->ast_cache, &dba, ic->config.query, ic->auth_checker);
+      }
+    }
+  }
+
+  /**
+   * @brief Restore streams of all currently defined databases.
+   * @note: Stream transformations are using modules, they have to be restored after the query modules are loaded.
+   *
+   * @param ic global InterpreterContext
+   */
+  void RestoreStreams(query::InterpreterContext *ic) {
+#ifdef MG_ENTERPRISE
+    std::lock_guard<LockT> wr(lock_);
+    for (auto &[_, db_gk] : db_handler_) {
+#else
+    {
+      auto &db_gk = db_gatekeeper_;
+#endif
+      auto db_acc = db_gk.access();
+      if (db_acc) {
+        auto *db = db_acc->get();
+        spdlog::debug("Restoring streams for database \"{}\"", db->id());
+        db->streams()->RestoreStreams(*db_acc, ic);
+      }
+    }
+  }
+
+  /**
+   * @brief todo
+   *
+   * @param f
+   */
+  void ForEach(auto f) {
+#ifdef MG_ENTERPRISE
+    std::shared_lock<LockT> rd(lock_);
+    for (auto &[_, db_gk] : db_handler_) {
+#else
+    {
+      auto &db_gk = db_gatekeeper_;
+#endif
+      auto db_acc = db_gk.access();
+      if (db_acc) {  // This isn't an error, just a defunct db
+        f(db_acc->get());
+      }
+    }
+  }
+
+  /**
+   * @brief todo
+   *
+   * @param f
+   */
+  void ForOne(auto f) {
+#ifdef MG_ENTERPRISE
+    std::shared_lock<LockT> rd(lock_);
+    for (auto &[_, db_gk] : db_handler_) {
+      auto db_acc = db_gk.access();
+      if (db_acc) {                   // This isn't an error, just a defunct db
+        if (f(db_acc->get())) break;  // Run until the first successful one
+      }
+    }
+#else
+    {
+      auto db_acc = db_gatekeeper_.access();
+      MG_ASSERT(db_acc, "Should always have the database");
+      f(db_acc->get());
+    }
+#endif
+  }
+
+ private:
+#ifdef MG_ENTERPRISE
+  /**
+   * @brief return the storage directory of the associated database
+   *
+   * @param name Database name
+   * @return std::optional<std::filesystem::path>
+   */
+  std::optional<std::filesystem::path> StorageDir_(const std::string &name) {
+    const auto conf = db_handler_.GetConfig(name);
+    if (conf) {
+      return conf->durability.storage_directory;
+    }
+    spdlog::debug("Failed to find storage dir for database \"{}\"", name);
+    return {};
+  }
+
+  /**
+   * @brief Create a new Database associated with the "name" database
+   *
+   * @param name name of the database
+   * @return NewResultT context on success, error on failure
+   */
+  NewResultT New_(const std::string &name) { return New_(name, name); }
+
+  /**
+   * @brief Create a new Database associated with the "name" database
+   *
+   * @param name name of the database
+   * @param storage_subdir undelying RocksDB directory
+   * @return NewResultT context on success, error on failure
+   */
+  NewResultT New_(const std::string &name, std::filesystem::path storage_subdir) {
+    auto config_copy = default_config_;
+    storage::UpdatePaths(config_copy, default_config_.durability.storage_directory / storage_subdir);
+    return New_(name, config_copy);
+  }
+
+  /**
+   * @brief Create a new Database associated with the "name" database
+   *
+   * @param name name of the database
+   * @param storage_config storage configuration
+   * @return NewResultT context on success, error on failure
+   */
+  NewResultT New_(const std::string &name, storage::Config &storage_config) {
+    if (defunct_dbs_.contains(name)) {
+      spdlog::warn("Failed to generate database due to the unknown state of the previously defunct database \"{}\".",
+                   name);
+      return NewError::DEFUNCT;
+    }
+
+    auto new_db = db_handler_.New(name, storage_config, repl_state_);
+    if (new_db.HasValue()) {
+      // Success
+      if (durability_) durability_->Put(name, "ok");  // TODO: Serialize the configuration?
+      return new_db.GetValue();
+    }
+    return new_db.GetError();
+  }
+
+  /**
+   * @brief Create a new Database associated with the default database
+   *
+   * @return NewResultT context on success, error on failure
+   */
+  NewResultT NewDefault_() {
+    // Create the default DB in the root (this is how it was done pre multi-tenancy)
+    auto res = New_(kDefaultDB, "..");
+    if (res.HasValue()) {
+      // For back-compatibility...
+      // Recreate the dbms layout for the default db and symlink to the root
+      const auto dir = StorageDir_(kDefaultDB);
+      MG_ASSERT(dir, "Failed to find storage path.");
+      const auto main_dir = *dir / "databases" / kDefaultDB;
+
+      if (!std::filesystem::exists(main_dir)) {
+        std::filesystem::create_directory(main_dir);
+      }
+
+      // Force link on-disk directories
+      const auto conf = db_handler_.GetConfig(kDefaultDB);
+      MG_ASSERT(conf, "No configuration for the default database.");
+      const auto &tmp_conf = conf->disk;
+      std::vector<std::filesystem::path> to_link{
+          tmp_conf.main_storage_directory,         tmp_conf.label_index_directory,
+          tmp_conf.label_property_index_directory, tmp_conf.unique_constraints_directory,
+          tmp_conf.name_id_mapper_directory,       tmp_conf.id_name_mapper_directory,
+          tmp_conf.durability_directory,           tmp_conf.wal_directory,
+      };
+
+      // Add in-memory paths
+      // Some directories are redundant (skip those)
+      const std::vector<std::string> skip{".lock", "audit_log", "auth", "databases", "internal_modules", "settings"};
+      for (auto const &item : std::filesystem::directory_iterator{*dir}) {
+        const auto dir_name = std::filesystem::relative(item.path(), item.path().parent_path());
+        if (std::find(skip.begin(), skip.end(), dir_name) != skip.end()) continue;
+        to_link.push_back(item.path());
+      }
+
+      // Symlink to root dir
+      for (auto const &item : to_link) {
+        const auto dir_name = std::filesystem::relative(item, item.parent_path());
+        const auto link = main_dir / dir_name;
+        const auto to = std::filesystem::relative(item, main_dir);
+        if (!std::filesystem::is_symlink(link) && !std::filesystem::exists(link)) {
+          std::filesystem::create_directory_symlink(to, link);
+        } else {  // Check existing link
+          std::error_code ec;
+          const auto test_link = std::filesystem::read_symlink(link, ec);
+          if (ec || test_link != to) {
+            MG_ASSERT(false,
+                      "Memgraph storage directory incompatible with new version.\n"
+                      "Please use a clean directory or remove \"{}\" and try again.",
+                      link.string());
+          }
+        }
+      }
+    }
+    return res;
+  }
+
+  /**
+   * @brief Get the DatabaseAccess for the database associated with the "name"
+   *
+   * @param name
+   * @return DatabaseAccess
+   * @throw UnknownDatabaseException if trying to get unknown database
+   */
+  DatabaseAccess Get_(std::string_view name) {
+    auto db = db_handler_.Get(name);
+    if (db) {
+      return *db;
+    }
+    throw UnknownDatabaseException("Tried to retrieve an unknown database \"{}\".", name);
+  }
+
+  mutable LockT lock_;                               //!< protective lock
+  storage::Config default_config_;                   //!< Storage configuration used when creating new databases
+  const replication::ReplicationState &repl_state_;  //!< Global replication state
+  DatabaseHandler db_handler_;                       //!< multi-tenancy storage handler
+  std::unique_ptr<kvstore::KVStore> durability_;     //!< list of active dbs (pointer so we can postpone its creation)
+  bool delete_on_drop_;                              //!< Flag defining if dropping storage also deletes its directory
+  std::set<std::string> defunct_dbs_;                //!< Databases that are in an unknown state due to various failures
+#else
+  mutable utils::Gatekeeper<Database> db_gatekeeper_;  //!< Single databases gatekeeper
+#endif
+};
+
+}  // namespace memgraph::dbms

src/dbms/global.hpp

@@ -19,6 +19,7 @@
 
 namespace memgraph::dbms {
 
+#ifdef MG_ENTERPRISE
 enum class DeleteError : uint8_t {
   DEFAULT_DB,
   USING,
@@ -34,11 +35,7 @@ enum class NewError : uint8_t {
   GENERIC,
 };
 
-enum class SetForResult : uint8_t {
-  SUCCESS,
-  ALREADY_SET,
-  FAIL,
-};
+#endif
 
 /**
  * UnknownSession Exception
@@ -48,6 +45,7 @@ enum class SetForResult : uint8_t {
 class UnknownSessionException : public utils::BasicException {
  public:
   using utils::BasicException::BasicException;
+  SPECIALIZE_GET_EXCEPTION_NAME(UnknownSessionException)
 };
 
 /**
@@ -58,53 +56,7 @@ class UnknownSessionException : public utils::BasicException {
 class UnknownDatabaseException : public utils::BasicException {
  public:
   using utils::BasicException::BasicException;
-};
-
-/**
- * @brief Session interface used by the DBMS to handle the the active sessions.
- * @todo Try to remove this dependency from SessionContextHandler. OnDelete could be removed, as it only does an assert.
- * OnChange could be removed if SetFor returned the pointer and the called then handled the OnChange execution.
- * However, the interface is very useful to  decouple the interpreter's query execution and the sessions themselves.
- */
-class SessionInterface {
- public:
-  SessionInterface() = default;
-  virtual ~SessionInterface() = default;
-
-  SessionInterface(const SessionInterface &) = default;
-  SessionInterface &operator=(const SessionInterface &) = default;
-  SessionInterface(SessionInterface &&) noexcept = default;
-  SessionInterface &operator=(SessionInterface &&) noexcept = default;
-
-  /**
-   * @brief Return the unique string identifying the session.
-   *
-   * @return std::string
-   */
-  virtual std::string UUID() const = 0;
-
-  /**
-   * @brief Return the currently active database.
-   *
-   * @return std::string
-   */
-  virtual std::string GetDatabaseName() const = 0;
-
-#ifdef MG_ENTERPRISE
-  /**
-   * @brief Gets called on database change.
-   *
-   * @return SetForResult enum (SUCCESS, ALREADY_SET or FAIL)
-   */
-  virtual dbms::SetForResult OnChange(const std::string &) = 0;
-
-  /**
-   * @brief Callback that gets called on database delete (drop).
-   *
-   * @return true on success
-   */
-  virtual bool OnDelete(const std::string &) = 0;
-#endif
+  SPECIALIZE_GET_EXCEPTION_NAME(UnknownDatabaseException)
 };
 
 }  // namespace memgraph::dbms

src/dbms/handler.hpp

@@ -18,21 +18,21 @@
 #include <unordered_map>
 
 #include "global.hpp"
+#include "utils/exceptions.hpp"
+#include "utils/gatekeeper.hpp"
 #include "utils/result.hpp"
-#include "utils/sync_ptr.hpp"
 
 namespace memgraph::dbms {
 
 /**
  * @brief Generic multi-database content handler.
  *
- * @tparam TContext
- * @tparam TConfig
+ * @tparam T
  */
-template <typename TContext, typename TConfig>
+template <typename T>
 class Handler {
  public:
-  using NewResult = utils::BasicResult<NewError, std::shared_ptr<TContext>>;
+  using NewResult = utils::BasicResult<NewError, typename utils::Gatekeeper<T>::Accessor>;
 
   /**
    * @brief Empty Handler constructor.
@@ -43,67 +43,65 @@ class Handler {
   /**
    * @brief Generate a new context and corresponding configuration.
    *
-   * @tparam T1 Variadic template of context constructor arguments
-   * @tparam T2 Variadic template of config constructor arguments
-   * @param name Name associated with the new context/config pair
-   * @param args1 Arguments passed (as a tuple) to the context constructor
-   * @param args2 Arguments passed (as a tuple) to the config constructor
+   * @tparam Args Variadic template of constructor arguments of T
+   * @param name Name associated with the new T
+   * @param args Arguments passed to the constructor of T
    * @return NewResult
    */
-  template <typename... T1, typename... T2>
-  NewResult New(std::string name, std::tuple<T1...> args1, std::tuple<T2...> args2) {
-    return New_(name, args1, args2, std::make_index_sequence<sizeof...(T1)>{},
-                std::make_index_sequence<sizeof...(T2)>{});
+  template <typename... Args>
+  NewResult New(std::piecewise_construct_t /* marker */, std::string_view name, Args &&...args) {
+    // Make sure the emplace will succeed, since we don't want to create temporary objects that could break something
+    if (!Has(name)) {
+      auto [itr, _] = items_.emplace(std::piecewise_construct, std::forward_as_tuple(name),
+                                     std::forward_as_tuple(std::forward<Args>(args)...));
+      auto db_acc = itr->second.access();
+      if (db_acc) return std::move(*db_acc);
+      return NewError::DEFUNCT;
+    }
+    spdlog::info("Item with name \"{}\" already exists.", name);
+    return NewError::EXISTS;
   }
 
   /**
    * @brief Get pointer to context.
    *
    * @param name Name associated with the wanted context
-   * @return std::optional<std::shared_ptr<TContext>>
+   * @return std::optional<typename utils::Gatekeeper<T>::Accessor>
    */
-  std::optional<std::shared_ptr<TContext>> Get(const std::string &name) {
+  std::optional<typename utils::Gatekeeper<T>::Accessor> Get(std::string_view name) {
     if (auto search = items_.find(name); search != items_.end()) {
-      return search->second.get();
+      return search->second.access();
     }
-    return {};
+    return std::nullopt;
   }
 
   /**
-   * @brief Get the config.
+   * @brief Delete the context associated with the name.
    *
-   * @param name Name associated with the wanted config
-   * @return std::optional<TConfig>
-   */
-  std::optional<TConfig> GetConfig(const std::string &name) const {
-    if (auto search = items_.find(name); search != items_.end()) {
-      return search->second.config();
-    }
-    return {};
-  }
-
-  /**
-   * @brief Delete the context/config pair associated with the name.
-   *
-   * @param name Name associated with the context/config pair to delete
+   * @param name Name associated with the context to delete
    * @return true on success
+   * @throw BasicException
    */
   bool Delete(const std::string &name) {
     if (auto itr = items_.find(name); itr != items_.end()) {
-      itr->second.DestroyAndSync();
-      items_.erase(itr);
-      return true;
+      auto db_acc = itr->second.access();
+      if (db_acc && db_acc->try_delete()) {
+        db_acc->reset();
+        items_.erase(itr);
+        return true;
+      }
+      return false;
     }
-    return false;
+    throw utils::BasicException("Unknown item \"{}\".", name);
   }
 
   /**
    * @brief Check if a name is already used.
    *
    * @param name Name to check
-   * @return true if a context/config pair is already associated with the name
+   * @return true if a T is already associated with the name
    */
-  bool Has(const std::string &name) const { return items_.find(name) != items_.end(); }
+  bool Has(std::string_view name) const { return items_.find(name) != items_.end(); }
 
   auto begin() { return items_.begin(); }
   auto end() { return items_.end(); }
@@ -112,31 +110,16 @@ class Handler {
   auto cbegin() const { return items_.cbegin(); }
   auto cend() const { return items_.cend(); }
 
- private:
-  /**
-   * @brief Lower level handler that hides some ugly code.
-   *
-   * @tparam T1 Variadic template of context constructor arguments
-   * @tparam T2 Variadic template of config constructor arguments
-   * @tparam I1 List of indexes associated with the first tuple
-   * @tparam I2 List of indexes associated with the second tuple
-   */
-  template <typename... T1, typename... T2, std::size_t... I1, std::size_t... I2>
-  NewResult New_(std::string name, std::tuple<T1...> &args1, std::tuple<T2...> &args2,
-                 std::integer_sequence<std::size_t, I1...> /*not-used*/,
-                 std::integer_sequence<std::size_t, I2...> /*not-used*/) {
-    // Make sure the emplace will succeed, since we don't want to create temporary objects that could break something
-    if (!Has(name)) {
-      auto [itr, _] = items_.emplace(std::piecewise_construct, std::forward_as_tuple(name),
-                                     std::forward_as_tuple(TConfig{std::forward<T1>(std::get<I1>(args1))...},
-                                                           std::forward<T2>(std::get<I2>(args2))...));
-      return itr->second.get();
-    }
-    spdlog::info("Item with name \"{}\" already exists.", name);
-    return NewError::EXISTS;
-  }
+  struct string_hash {
+    using is_transparent = void;
+    [[nodiscard]] size_t operator()(const char *s) const { return std::hash<std::string_view>{}(s); }
+    [[nodiscard]] size_t operator()(std::string_view s) const { return std::hash<std::string_view>{}(s); }
+    [[nodiscard]] size_t operator()(const std::string &s) const { return std::hash<std::string>{}(s); }
+  };
 
-  std::unordered_map<std::string, utils::SyncPtr<TContext, TConfig>> items_;  //!< map to all active items
+ private:
+  std::unordered_map<std::string, utils::Gatekeeper<T>, string_hash, std::equal_to<>>
+      items_;  //!< map to all active items
 };
 
 }  // namespace memgraph::dbms

src/dbms/inmemory/replication_handlers.cpp

@@ -0,0 +1,702 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#include "dbms/inmemory/replication_handlers.hpp"
+#include "dbms/constants.hpp"
+#include "dbms/dbms_handler.hpp"
+#include "replication/replication_server.hpp"
+#include "spdlog/spdlog.h"
+#include "storage/v2/durability/durability.hpp"
+#include "storage/v2/durability/snapshot.hpp"
+#include "storage/v2/durability/version.hpp"
+#include "storage/v2/indices/label_index_stats.hpp"
+#include "storage/v2/inmemory/storage.hpp"
+#include "storage/v2/inmemory/unique_constraints.hpp"
+
+using memgraph::storage::Delta;
+using memgraph::storage::EdgeAccessor;
+using memgraph::storage::EdgeRef;
+using memgraph::storage::EdgeTypeId;
+using memgraph::storage::LabelIndexStats;
+using memgraph::storage::LabelPropertyIndexStats;
+using memgraph::storage::PropertyId;
+using memgraph::storage::UniqueConstraints;
+using memgraph::storage::View;
+using memgraph::storage::durability::WalDeltaData;
+
+namespace memgraph::dbms {
+namespace {
+std::pair<uint64_t, WalDeltaData> ReadDelta(storage::durability::BaseDecoder *decoder) {
+  try {
+    auto timestamp = ReadWalDeltaHeader(decoder);
+    SPDLOG_INFO("       Timestamp {}", timestamp);
+    auto delta = ReadWalDeltaData(decoder);
+    return {timestamp, delta};
+  } catch (const slk::SlkReaderException &) {
+    throw utils::BasicException("Missing data!");
+  } catch (const storage::durability::RecoveryFailure &) {
+    throw utils::BasicException("Invalid data!");
+  }
+};
+
+std::optional<DatabaseAccess> GetDatabaseAccessor(dbms::DbmsHandler *dbms_handler, std::string_view db_name) {
+  try {
+#ifdef MG_ENTERPRISE
+    auto acc = dbms_handler->Get(db_name);
+#else
+    if (db_name != dbms::kDefaultDB) {
+      spdlog::warn("Trying to replicate a non-default database on a community replica.");
+      return std::nullopt;
+    }
+    auto acc = dbms_handler->Get();
+#endif
+    if (!acc) {
+      spdlog::error("Failed to get access to ", db_name);
+      return std::nullopt;
+    }
+    auto *inmem_storage = dynamic_cast<storage::InMemoryStorage *>(acc.get()->storage());
+    if (!inmem_storage || inmem_storage->storage_mode_ != storage::StorageMode::IN_MEMORY_TRANSACTIONAL) {
+      spdlog::error("Database \"{}\" is not IN_MEMORY_TRANSACTIONAL.", db_name);
+      return std::nullopt;
+    }
+    return std::optional{std::move(acc)};
+  } catch (const dbms::UnknownDatabaseException &e) {
+    spdlog::warn("No database \"{}\" on replica!", db_name);
+    return std::nullopt;
+  }
+}
+}  // namespace
+
+void InMemoryReplicationHandlers::Register(dbms::DbmsHandler *dbms_handler, replication::ReplicationServer &server) {
+  server.rpc_server_.Register<storage::replication::HeartbeatRpc>([dbms_handler](auto *req_reader, auto *res_builder) {
+    spdlog::debug("Received HeartbeatRpc");
+    InMemoryReplicationHandlers::HeartbeatHandler(dbms_handler, req_reader, res_builder);
+  });
+  server.rpc_server_.Register<storage::replication::AppendDeltasRpc>(
+      [dbms_handler](auto *req_reader, auto *res_builder) {
+        spdlog::debug("Received AppendDeltasRpc");
+        InMemoryReplicationHandlers::AppendDeltasHandler(dbms_handler, req_reader, res_builder);
+      });
+  server.rpc_server_.Register<storage::replication::SnapshotRpc>([dbms_handler](auto *req_reader, auto *res_builder) {
+    spdlog::debug("Received SnapshotRpc");
+    InMemoryReplicationHandlers::SnapshotHandler(dbms_handler, req_reader, res_builder);
+  });
+  server.rpc_server_.Register<storage::replication::WalFilesRpc>([dbms_handler](auto *req_reader, auto *res_builder) {
+    spdlog::debug("Received WalFilesRpc");
+    InMemoryReplicationHandlers::WalFilesHandler(dbms_handler, req_reader, res_builder);
+  });
+  server.rpc_server_.Register<storage::replication::CurrentWalRpc>([dbms_handler](auto *req_reader, auto *res_builder) {
+    spdlog::debug("Received CurrentWalRpc");
+    InMemoryReplicationHandlers::CurrentWalHandler(dbms_handler, req_reader, res_builder);
+  });
+  server.rpc_server_.Register<storage::replication::TimestampRpc>([dbms_handler](auto *req_reader, auto *res_builder) {
+    spdlog::debug("Received TimestampRpc");
+    InMemoryReplicationHandlers::TimestampHandler(dbms_handler, req_reader, res_builder);
+  });
+}
+
+void InMemoryReplicationHandlers::HeartbeatHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader,
+                                                   slk::Builder *res_builder) {
+  storage::replication::HeartbeatReq req;
+  slk::Load(&req, req_reader);
+  auto const db_acc = GetDatabaseAccessor(dbms_handler, req.db_name);
+  if (!db_acc) return;
+
+  // TODO: this handler is agnostic of InMemory, move to be reused by on-disk
+  auto const *storage = db_acc->get()->storage();
+  storage::replication::HeartbeatRes res{storage->id(), true,
+                                         storage->repl_storage_state_.last_commit_timestamp_.load(),
+                                         std::string{storage->repl_storage_state_.epoch_.id()}};
+  slk::Save(res, res_builder);
+}
+
+void InMemoryReplicationHandlers::AppendDeltasHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader,
+                                                      slk::Builder *res_builder) {
+  storage::replication::AppendDeltasReq req;
+  slk::Load(&req, req_reader);
+  auto db_acc = GetDatabaseAccessor(dbms_handler, req.db_name);
+  if (!db_acc) return;
+
+  storage::replication::Decoder decoder(req_reader);
+
+  auto maybe_epoch_id = decoder.ReadString();
+  MG_ASSERT(maybe_epoch_id, "Invalid replication message");
+
+  auto *storage = static_cast<storage::InMemoryStorage *>(db_acc->get()->storage());
+  auto &repl_storage_state = storage->repl_storage_state_;
+  if (*maybe_epoch_id != storage->repl_storage_state_.epoch_.id()) {
+    auto prev_epoch = storage->repl_storage_state_.epoch_.SetEpoch(*maybe_epoch_id);
+    repl_storage_state.AddEpochToHistoryForce(prev_epoch);
+  }
+
+  if (storage->wal_file_) {
+    if (req.seq_num > storage->wal_file_->SequenceNumber() ||
+        *maybe_epoch_id != storage->repl_storage_state_.epoch_.id()) {
+      storage->wal_file_->FinalizeWal();
+      storage->wal_file_.reset();
+      storage->wal_seq_num_ = req.seq_num;
+      spdlog::trace("Finalized WAL file");
+    } else {
+      MG_ASSERT(storage->wal_file_->SequenceNumber() == req.seq_num, "Invalid sequence number of current wal file");
+      storage->wal_seq_num_ = req.seq_num + 1;
+    }
+  } else {
+    storage->wal_seq_num_ = req.seq_num;
+  }
+
+  if (req.previous_commit_timestamp != repl_storage_state.last_commit_timestamp_.load()) {
+    // Empty the stream
+    bool transaction_complete = false;
+    while (!transaction_complete) {
+      SPDLOG_INFO("Skipping delta");
+      const auto [timestamp, delta] = ReadDelta(&decoder);
+      transaction_complete = storage::durability::IsWalDeltaDataTypeTransactionEnd(
+          delta.type,
+          storage::durability::kVersion);  // TODO: Check if we are always using the latest version when replicating
+    }
+
+    storage::replication::AppendDeltasRes res{storage->id(), false, repl_storage_state.last_commit_timestamp_.load()};
+    slk::Save(res, res_builder);
+    return;
+  }
+
+  ReadAndApplyDelta(
+      storage, &decoder,
+      storage::durability::kVersion);  // TODO: Check if we are always using the latest version when replicating
+
+  storage::replication::AppendDeltasRes res{storage->id(), true, repl_storage_state.last_commit_timestamp_.load()};
+  slk::Save(res, res_builder);
+  spdlog::debug("Replication recovery from append deltas finished, replica is now up to date!");
+}
+
+void InMemoryReplicationHandlers::SnapshotHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader,
+                                                  slk::Builder *res_builder) {
+  storage::replication::SnapshotReq req;
+  slk::Load(&req, req_reader);
+  auto db_acc = GetDatabaseAccessor(dbms_handler, req.db_name);
+  if (!db_acc) return;
+
+  storage::replication::Decoder decoder(req_reader);
+
+  auto *storage = static_cast<storage::InMemoryStorage *>(db_acc->get()->storage());
+  utils::EnsureDirOrDie(storage->snapshot_directory_);
+
+  const auto maybe_snapshot_path = decoder.ReadFile(storage->snapshot_directory_);
+  MG_ASSERT(maybe_snapshot_path, "Failed to load snapshot!");
+  spdlog::info("Received snapshot saved to {}", *maybe_snapshot_path);
+
+  auto storage_guard = std::unique_lock{storage->main_lock_};
+  spdlog::trace("Clearing database since recovering from snapshot.");
+  // Clear the database
+  storage->vertices_.clear();
+  storage->edges_.clear();
+
+  storage->constraints_.existence_constraints_ = std::make_unique<storage::ExistenceConstraints>();
+  storage->constraints_.unique_constraints_ = std::make_unique<storage::InMemoryUniqueConstraints>();
+  storage->indices_.label_index_ = std::make_unique<storage::InMemoryLabelIndex>();
+  storage->indices_.label_property_index_ = std::make_unique<storage::InMemoryLabelPropertyIndex>();
+  try {
+    spdlog::debug("Loading snapshot");
+    auto recovered_snapshot = storage::durability::LoadSnapshot(
+        *maybe_snapshot_path, &storage->vertices_, &storage->edges_, &storage->repl_storage_state_.history,
+        storage->name_id_mapper_.get(), &storage->edge_count_, storage->config_);
+    spdlog::debug("Snapshot loaded successfully");
+    // If this step is present it should always be the first step of
+    // the recovery so we use the UUID we read from snasphost
+    storage->uuid_ = std::move(recovered_snapshot.snapshot_info.uuid);
+    storage->repl_storage_state_.epoch_.SetEpoch(std::move(recovered_snapshot.snapshot_info.epoch_id));
+    const auto &recovery_info = recovered_snapshot.recovery_info;
+    storage->vertex_id_ = recovery_info.next_vertex_id;
+    storage->edge_id_ = recovery_info.next_edge_id;
+    storage->timestamp_ = std::max(storage->timestamp_, recovery_info.next_timestamp);
+
+    spdlog::trace("Recovering indices and constraints from snapshot.");
+    storage::durability::RecoverIndicesAndConstraints(recovered_snapshot.indices_constraints, &storage->indices_,
+                                                      &storage->constraints_, &storage->vertices_);
+  } catch (const storage::durability::RecoveryFailure &e) {
+    LOG_FATAL("Couldn't load the snapshot because of: {}", e.what());
+  }
+  storage_guard.unlock();
+
+  storage::replication::SnapshotRes res{storage->id(), true,
+                                        storage->repl_storage_state_.last_commit_timestamp_.load()};
+  slk::Save(res, res_builder);
+
+  spdlog::trace("Deleting old snapshot files due to snapshot recovery.");
+  // Delete other durability files
+  auto snapshot_files = storage::durability::GetSnapshotFiles(storage->snapshot_directory_, storage->uuid_);
+  for (const auto &[path, uuid, _] : snapshot_files) {
+    if (path != *maybe_snapshot_path) {
+      spdlog::trace("Deleting snapshot file {}", path);
+      storage->file_retainer_.DeleteFile(path);
+    }
+  }
+
+  spdlog::trace("Deleting old WAL files due to snapshot recovery.");
+  auto wal_files = storage::durability::GetWalFiles(storage->wal_directory_, storage->uuid_);
+  if (wal_files) {
+    for (const auto &wal_file : *wal_files) {
+      spdlog::trace("Deleting WAL file {}", wal_file.path);
+      storage->file_retainer_.DeleteFile(wal_file.path);
+    }
+
+    storage->wal_file_.reset();
+  }
+  spdlog::debug("Replication recovery from snapshot finished!");
+}
+
+void InMemoryReplicationHandlers::WalFilesHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader,
+                                                  slk::Builder *res_builder) {
+  storage::replication::WalFilesReq req;
+  slk::Load(&req, req_reader);
+  auto db_acc = GetDatabaseAccessor(dbms_handler, req.db_name);
+  if (!db_acc) return;
+
+  const auto wal_file_number = req.file_number;
+  spdlog::debug("Received WAL files: {}", wal_file_number);
+
+  storage::replication::Decoder decoder(req_reader);
+
+  auto *storage = static_cast<storage::InMemoryStorage *>(db_acc->get()->storage());
+  utils::EnsureDirOrDie(storage->wal_directory_);
+
+  for (auto i = 0; i < wal_file_number; ++i) {
+    LoadWal(storage, &decoder);
+  }
+
+  storage::replication::WalFilesRes res{storage->id(), true,
+                                        storage->repl_storage_state_.last_commit_timestamp_.load()};
+  slk::Save(res, res_builder);
+  spdlog::debug("Replication recovery from WAL files ended successfully, replica is now up to date!");
+}
+
+void InMemoryReplicationHandlers::CurrentWalHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader,
+                                                    slk::Builder *res_builder) {
+  storage::replication::CurrentWalReq req;
+  slk::Load(&req, req_reader);
+  auto db_acc = GetDatabaseAccessor(dbms_handler, req.db_name);
+  if (!db_acc) return;
+
+  storage::replication::Decoder decoder(req_reader);
+
+  auto *storage = static_cast<storage::InMemoryStorage *>(db_acc->get()->storage());
+  utils::EnsureDirOrDie(storage->wal_directory_);
+
+  LoadWal(storage, &decoder);
+
+  storage::replication::CurrentWalRes res{storage->id(), true,
+                                          storage->repl_storage_state_.last_commit_timestamp_.load()};
+  slk::Save(res, res_builder);
+  spdlog::debug("Replication recovery from current WAL ended successfully, replica is now up to date!");
+}
+
+void InMemoryReplicationHandlers::LoadWal(storage::InMemoryStorage *storage, storage::replication::Decoder *decoder) {
+  const auto temp_wal_directory =
+      std::filesystem::temp_directory_path() / "memgraph" / storage::durability::kWalDirectory;
+  utils::EnsureDir(temp_wal_directory);
+  auto maybe_wal_path = decoder->ReadFile(temp_wal_directory);
+  MG_ASSERT(maybe_wal_path, "Failed to load WAL!");
+  spdlog::trace("Received WAL saved to {}", *maybe_wal_path);
+  try {
+    auto wal_info = storage::durability::ReadWalInfo(*maybe_wal_path);
+    if (wal_info.seq_num == 0) {
+      storage->uuid_ = wal_info.uuid;
+    }
+    auto &replica_epoch = storage->repl_storage_state_.epoch_;
+    if (wal_info.epoch_id != replica_epoch.id()) {
+      auto prev_epoch = replica_epoch.SetEpoch(wal_info.epoch_id);
+      storage->repl_storage_state_.AddEpochToHistoryForce(prev_epoch);
+    }
+
+    if (storage->wal_file_) {
+      if (storage->wal_file_->SequenceNumber() != wal_info.seq_num) {
+        storage->wal_file_->FinalizeWal();
+        storage->wal_seq_num_ = wal_info.seq_num;
+        storage->wal_file_.reset();
+        spdlog::trace("WAL file {} finalized successfully", *maybe_wal_path);
+      }
+    } else {
+      storage->wal_seq_num_ = wal_info.seq_num;
+    }
+    spdlog::trace("Loading WAL deltas from {}", *maybe_wal_path);
+    storage::durability::Decoder wal;
+    const auto version = wal.Initialize(*maybe_wal_path, storage::durability::kWalMagic);
+    spdlog::debug("WAL file {} loaded successfully", *maybe_wal_path);
+    if (!version) throw storage::durability::RecoveryFailure("Couldn't read WAL magic and/or version!");
+    if (!storage::durability::IsVersionSupported(*version))
+      throw storage::durability::RecoveryFailure("Invalid WAL version!");
+    wal.SetPosition(wal_info.offset_deltas);
+
+    for (size_t i = 0; i < wal_info.num_deltas;) {
+      i += ReadAndApplyDelta(storage, &wal, *version);
+    }
+
+    spdlog::debug("Replication from current WAL successful!");
+  } catch (const storage::durability::RecoveryFailure &e) {
+    LOG_FATAL("Couldn't recover WAL deltas from {} because of: {}", *maybe_wal_path, e.what());
+  }
+}
+
+void InMemoryReplicationHandlers::TimestampHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader,
+                                                   slk::Builder *res_builder) {
+  storage::replication::TimestampReq req;
+  slk::Load(&req, req_reader);
+  auto const db_acc = GetDatabaseAccessor(dbms_handler, req.db_name);
+  if (!db_acc) return;
+
+  // TODO: this handler is agnostic of InMemory, move to be reused by on-disk
+  auto const *storage = db_acc->get()->storage();
+  storage::replication::TimestampRes res{storage->id(), true,
+                                         storage->repl_storage_state_.last_commit_timestamp_.load()};
+  slk::Save(res, res_builder);
+}
+
+uint64_t InMemoryReplicationHandlers::ReadAndApplyDelta(storage::InMemoryStorage *storage,
+                                                        storage::durability::BaseDecoder *decoder,
+                                                        const uint64_t version) {
+  auto edge_acc = storage->edges_.access();
+  auto vertex_acc = storage->vertices_.access();
+
+  constexpr bool kUniqueAccess = true;
+  constexpr bool kSharedAccess = false;
+
+  std::optional<std::pair<uint64_t, storage::InMemoryStorage::ReplicationAccessor>> commit_timestamp_and_accessor;
+  auto get_transaction = [storage, &commit_timestamp_and_accessor](uint64_t commit_timestamp,
+                                                                   bool unique = kSharedAccess) {
+    if (!commit_timestamp_and_accessor) {
+      std::unique_ptr<storage::Storage::Accessor> acc = nullptr;
+      if (unique) {
+        acc = storage->UniqueAccess(std::nullopt, false /*not main*/);
+      } else {
+        acc = storage->Access(std::nullopt, false /*not main*/);
+      }
+      auto inmem_acc = std::unique_ptr<storage::InMemoryStorage::InMemoryAccessor>(
+          static_cast<storage::InMemoryStorage::InMemoryAccessor *>(acc.release()));
+      commit_timestamp_and_accessor.emplace(commit_timestamp, std::move(*inmem_acc));
+    } else if (commit_timestamp_and_accessor->first != commit_timestamp) {
+      throw utils::BasicException("Received more than one transaction!");
+    }
+    return &commit_timestamp_and_accessor->second;
+  };
+
+  uint64_t applied_deltas = 0;
+  auto max_commit_timestamp = storage->repl_storage_state_.last_commit_timestamp_.load();
+
+  for (bool transaction_complete = false; !transaction_complete; ++applied_deltas) {
+    const auto [timestamp, delta] = ReadDelta(decoder);
+    if (timestamp > max_commit_timestamp) {
+      max_commit_timestamp = timestamp;
+    }
+
+    transaction_complete = storage::durability::IsWalDeltaDataTypeTransactionEnd(delta.type, version);
+
+    if (timestamp < storage->timestamp_) {
+      continue;
+    }
+
+    SPDLOG_INFO("  Delta {}", applied_deltas);
+    switch (delta.type) {
+      case WalDeltaData::Type::VERTEX_CREATE: {
+        spdlog::trace("       Create vertex {}", delta.vertex_create_delete.gid.AsUint());
+        auto *transaction = get_transaction(timestamp);
+        transaction->CreateVertexEx(delta.vertex_create_delete.gid);
+        break;
+      }
+      case WalDeltaData::Type::VERTEX_DELETE: {
+        spdlog::trace("       Delete vertex {}", delta.vertex_create_delete.gid.AsUint());
+        auto *transaction = get_transaction(timestamp);
+        auto vertex = transaction->FindVertex(delta.vertex_create_delete.gid, View::NEW);
+        if (!vertex) throw utils::BasicException("Invalid transaction!");
+        auto ret = transaction->DeleteVertex(&*vertex);
+        if (ret.HasError() || !ret.GetValue()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::VERTEX_ADD_LABEL: {
+        spdlog::trace("       Vertex {} add label {}", delta.vertex_add_remove_label.gid.AsUint(),
+                      delta.vertex_add_remove_label.label);
+        auto *transaction = get_transaction(timestamp);
+        auto vertex = transaction->FindVertex(delta.vertex_add_remove_label.gid, View::NEW);
+        if (!vertex) throw utils::BasicException("Invalid transaction!");
+        auto ret = vertex->AddLabel(transaction->NameToLabel(delta.vertex_add_remove_label.label));
+        if (ret.HasError() || !ret.GetValue()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::VERTEX_REMOVE_LABEL: {
+        spdlog::trace("       Vertex {} remove label {}", delta.vertex_add_remove_label.gid.AsUint(),
+                      delta.vertex_add_remove_label.label);
+        auto *transaction = get_transaction(timestamp);
+        auto vertex = transaction->FindVertex(delta.vertex_add_remove_label.gid, View::NEW);
+        if (!vertex) throw utils::BasicException("Invalid transaction!");
+        auto ret = vertex->RemoveLabel(transaction->NameToLabel(delta.vertex_add_remove_label.label));
+        if (ret.HasError() || !ret.GetValue()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::VERTEX_SET_PROPERTY: {
+        spdlog::trace("       Vertex {} set property {} to {}", delta.vertex_edge_set_property.gid.AsUint(),
+                      delta.vertex_edge_set_property.property, delta.vertex_edge_set_property.value);
+        auto *transaction = get_transaction(timestamp);
+        auto vertex = transaction->FindVertex(delta.vertex_edge_set_property.gid, View::NEW);
+        if (!vertex) throw utils::BasicException("Invalid transaction!");
+        auto ret = vertex->SetProperty(transaction->NameToProperty(delta.vertex_edge_set_property.property),
+                                       delta.vertex_edge_set_property.value);
+        if (ret.HasError()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::EDGE_CREATE: {
+        spdlog::trace("       Create edge {} of type {} from vertex {} to vertex {}",
+                      delta.edge_create_delete.gid.AsUint(), delta.edge_create_delete.edge_type,
+                      delta.edge_create_delete.from_vertex.AsUint(), delta.edge_create_delete.to_vertex.AsUint());
+        auto *transaction = get_transaction(timestamp);
+        auto from_vertex = transaction->FindVertex(delta.edge_create_delete.from_vertex, View::NEW);
+        if (!from_vertex) throw utils::BasicException("Invalid transaction!");
+        auto to_vertex = transaction->FindVertex(delta.edge_create_delete.to_vertex, View::NEW);
+        if (!to_vertex) throw utils::BasicException("Invalid transaction!");
+        auto edge = transaction->CreateEdgeEx(&*from_vertex, &*to_vertex,
+                                              transaction->NameToEdgeType(delta.edge_create_delete.edge_type),
+                                              delta.edge_create_delete.gid);
+        if (edge.HasError()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::EDGE_DELETE: {
+        spdlog::trace("       Delete edge {} of type {} from vertex {} to vertex {}",
+                      delta.edge_create_delete.gid.AsUint(), delta.edge_create_delete.edge_type,
+                      delta.edge_create_delete.from_vertex.AsUint(), delta.edge_create_delete.to_vertex.AsUint());
+        auto *transaction = get_transaction(timestamp);
+        auto from_vertex = transaction->FindVertex(delta.edge_create_delete.from_vertex, View::NEW);
+        if (!from_vertex) throw utils::BasicException("Invalid transaction!");
+        auto to_vertex = transaction->FindVertex(delta.edge_create_delete.to_vertex, View::NEW);
+        if (!to_vertex) throw utils::BasicException("Invalid transaction!");
+        auto edges = from_vertex->OutEdges(View::NEW, {transaction->NameToEdgeType(delta.edge_create_delete.edge_type)},
+                                           &*to_vertex);
+        if (edges.HasError()) throw utils::BasicException("Invalid transaction!");
+        if (edges->edges.size() != 1) throw utils::BasicException("Invalid transaction!");
+        auto &edge = (*edges).edges[0];
+        auto ret = transaction->DeleteEdge(&edge);
+        if (ret.HasError()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::EDGE_SET_PROPERTY: {
+        spdlog::trace("       Edge {} set property {} to {}", delta.vertex_edge_set_property.gid.AsUint(),
+                      delta.vertex_edge_set_property.property, delta.vertex_edge_set_property.value);
+        if (!storage->config_.items.properties_on_edges)
+          throw utils::BasicException(
+              "Can't set properties on edges because properties on edges "
+              "are disabled!");
+
+        auto *transaction = get_transaction(timestamp);
+
+        // The following block of code effectively implements `FindEdge` and
+        // yields an accessor that is only valid for managing the edge's
+        // properties.
+        auto edge = edge_acc.find(delta.vertex_edge_set_property.gid);
+        if (edge == edge_acc.end()) throw utils::BasicException("Invalid transaction!");
+        // The edge visibility check must be done here manually because we
+        // don't allow direct access to the edges through the public API.
+        {
+          bool is_visible = true;
+          Delta *delta = nullptr;
+          {
+            auto guard = std::shared_lock{edge->lock};
+            is_visible = !edge->deleted;
+            delta = edge->delta;
+          }
+          ApplyDeltasForRead(&transaction->GetTransaction(), delta, View::NEW, [&is_visible](const Delta &delta) {
+            switch (delta.action) {
+              case Delta::Action::ADD_LABEL:
+              case Delta::Action::REMOVE_LABEL:
+              case Delta::Action::SET_PROPERTY:
+              case Delta::Action::ADD_IN_EDGE:
+              case Delta::Action::ADD_OUT_EDGE:
+              case Delta::Action::REMOVE_IN_EDGE:
+              case Delta::Action::REMOVE_OUT_EDGE:
+                break;
+              case Delta::Action::RECREATE_OBJECT: {
+                is_visible = true;
+                break;
+              }
+              case Delta::Action::DELETE_DESERIALIZED_OBJECT:
+              case Delta::Action::DELETE_OBJECT: {
+                is_visible = false;
+                break;
+              }
+            }
+          });
+          if (!is_visible) throw utils::BasicException("Invalid transaction!");
+        }
+        EdgeRef edge_ref(&*edge);
+        // Here we create an edge accessor that we will use to get the
+        // properties of the edge. The accessor is created with an invalid
+        // type and invalid from/to pointers because we don't know them
+        // here, but that isn't an issue because we won't use that part of
+        // the API here.
+        auto ea = EdgeAccessor{edge_ref, EdgeTypeId::FromUint(0UL),     nullptr, nullptr,
+                               storage,  &transaction->GetTransaction()};
+
+        auto ret = ea.SetProperty(transaction->NameToProperty(delta.vertex_edge_set_property.property),
+                                  delta.vertex_edge_set_property.value);
+        if (ret.HasError()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+
+      case WalDeltaData::Type::TRANSACTION_END: {
+        spdlog::trace("       Transaction end");
+        if (!commit_timestamp_and_accessor || commit_timestamp_and_accessor->first != timestamp)
+          throw utils::BasicException("Invalid commit data!");
+        auto ret =
+            commit_timestamp_and_accessor->second.Commit(commit_timestamp_and_accessor->first, false /* not main */);
+        if (ret.HasError()) throw utils::BasicException("Invalid transaction!");
+        commit_timestamp_and_accessor = std::nullopt;
+        break;
+      }
+
+      case WalDeltaData::Type::LABEL_INDEX_CREATE: {
+        spdlog::trace("       Create label index on :{}", delta.operation_label.label);
+        // Need to send the timestamp
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        if (transaction->CreateIndex(storage->NameToLabel(delta.operation_label.label)).HasError())
+          throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::LABEL_INDEX_DROP: {
+        spdlog::trace("       Drop label index on :{}", delta.operation_label.label);
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        if (transaction->DropIndex(storage->NameToLabel(delta.operation_label.label)).HasError())
+          throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::LABEL_INDEX_STATS_SET: {
+        spdlog::trace("       Set label index statistics on :{}", delta.operation_label_stats.label);
+        // Need to send the timestamp
+        auto *transaction = get_transaction(timestamp);
+        const auto label = storage->NameToLabel(delta.operation_label_stats.label);
+        LabelIndexStats stats{};
+        if (!FromJson(delta.operation_label_stats.stats, stats)) {
+          throw utils::BasicException("Failed to read statistics!");
+        }
+        transaction->SetIndexStats(label, stats);
+        break;
+      }
+      case WalDeltaData::Type::LABEL_INDEX_STATS_CLEAR: {
+        const auto &info = delta.operation_label;
+        spdlog::trace("       Clear label index statistics on :{}", info.label);
+        // Need to send the timestamp
+        auto *transaction = get_transaction(timestamp);
+        transaction->DeleteLabelIndexStats(storage->NameToLabel(info.label));
+        break;
+      }
+      case WalDeltaData::Type::LABEL_PROPERTY_INDEX_CREATE: {
+        spdlog::trace("       Create label+property index on :{} ({})", delta.operation_label_property.label,
+                      delta.operation_label_property.property);
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        if (transaction
+                ->CreateIndex(storage->NameToLabel(delta.operation_label_property.label),
+                              storage->NameToProperty(delta.operation_label_property.property))
+                .HasError())
+          throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::LABEL_PROPERTY_INDEX_DROP: {
+        spdlog::trace("       Drop label+property index on :{} ({})", delta.operation_label_property.label,
+                      delta.operation_label_property.property);
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        if (transaction
+                ->DropIndex(storage->NameToLabel(delta.operation_label_property.label),
+                            storage->NameToProperty(delta.operation_label_property.property))
+                .HasError())
+          throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::LABEL_PROPERTY_INDEX_STATS_SET: {
+        const auto &info = delta.operation_label_property_stats;
+        spdlog::trace("       Set label-property index statistics on :{}", info.label);
+        // Need to send the timestamp
+        auto *transaction = get_transaction(timestamp);
+        const auto label = storage->NameToLabel(info.label);
+        const auto property = storage->NameToProperty(info.property);
+        LabelPropertyIndexStats stats{};
+        if (!FromJson(info.stats, stats)) {
+          throw utils::BasicException("Failed to read statistics!");
+        }
+        transaction->SetIndexStats(label, property, stats);
+        break;
+      }
+      case WalDeltaData::Type::LABEL_PROPERTY_INDEX_STATS_CLEAR: {
+        const auto &info = delta.operation_label;
+        spdlog::trace("       Clear label-property index statistics on :{}", info.label);
+        // Need to send the timestamp
+        auto *transaction = get_transaction(timestamp);
+        transaction->DeleteLabelPropertyIndexStats(storage->NameToLabel(info.label));
+        break;
+      }
+      case WalDeltaData::Type::EXISTENCE_CONSTRAINT_CREATE: {
+        spdlog::trace("       Create existence constraint on :{} ({})", delta.operation_label_property.label,
+                      delta.operation_label_property.property);
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        auto ret =
+            transaction->CreateExistenceConstraint(storage->NameToLabel(delta.operation_label_property.label),
+                                                   storage->NameToProperty(delta.operation_label_property.property));
+        if (ret.HasError()) throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::EXISTENCE_CONSTRAINT_DROP: {
+        spdlog::trace("       Drop existence constraint on :{} ({})", delta.operation_label_property.label,
+                      delta.operation_label_property.property);
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        if (transaction
+                ->DropExistenceConstraint(storage->NameToLabel(delta.operation_label_property.label),
+                                          storage->NameToProperty(delta.operation_label_property.property))
+                .HasError())
+          throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::UNIQUE_CONSTRAINT_CREATE: {
+        std::stringstream ss;
+        utils::PrintIterable(ss, delta.operation_label_properties.properties);
+        spdlog::trace("       Create unique constraint on :{} ({})", delta.operation_label_properties.label, ss.str());
+        std::set<PropertyId> properties;
+        for (const auto &prop : delta.operation_label_properties.properties) {
+          properties.emplace(storage->NameToProperty(prop));
+        }
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        auto ret = transaction->CreateUniqueConstraint(storage->NameToLabel(delta.operation_label_properties.label),
+                                                       properties);
+        if (!ret.HasValue() || ret.GetValue() != UniqueConstraints::CreationStatus::SUCCESS)
+          throw utils::BasicException("Invalid transaction!");
+        break;
+      }
+      case WalDeltaData::Type::UNIQUE_CONSTRAINT_DROP: {
+        std::stringstream ss;
+        utils::PrintIterable(ss, delta.operation_label_properties.properties);
+        spdlog::trace("       Drop unique constraint on :{} ({})", delta.operation_label_properties.label, ss.str());
+        std::set<PropertyId> properties;
+        for (const auto &prop : delta.operation_label_properties.properties) {
+          properties.emplace(storage->NameToProperty(prop));
+        }
+        auto *transaction = get_transaction(timestamp, kUniqueAccess);
+        auto ret =
+            transaction->DropUniqueConstraint(storage->NameToLabel(delta.operation_label_properties.label), properties);
+        if (ret != UniqueConstraints::DeletionStatus::SUCCESS) {
+          throw utils::BasicException("Invalid transaction!");
+        }
+        break;
+      }
+    }
+  }
+
+  if (commit_timestamp_and_accessor) throw utils::BasicException("Did not finish the transaction!");
+
+  storage->repl_storage_state_.last_commit_timestamp_ = max_commit_timestamp;
+
+  spdlog::debug("Applied {} deltas", applied_deltas);
+  return applied_deltas;
+}
+
+}  // namespace memgraph::dbms

src/dbms/inmemory/replication_handlers.hpp

@@ -0,0 +1,49 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include "replication/replication_server.hpp"
+#include "replication/state.hpp"
+#include "storage/v2/replication/serialization.hpp"
+
+namespace memgraph::storage {
+class InMemoryStorage;
+}
+namespace memgraph::dbms {
+
+class DbmsHandler;
+
+class InMemoryReplicationHandlers {
+ public:
+  static void Register(dbms::DbmsHandler *dbms_handler, replication::ReplicationServer &server);
+
+ private:
+  // RPC handlers
+  static void HeartbeatHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader, slk::Builder *res_builder);
+
+  static void AppendDeltasHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader, slk::Builder *res_builder);
+
+  static void SnapshotHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader, slk::Builder *res_builder);
+
+  static void WalFilesHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader, slk::Builder *res_builder);
+
+  static void CurrentWalHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader, slk::Builder *res_builder);
+
+  static void TimestampHandler(dbms::DbmsHandler *dbms_handler, slk::Reader *req_reader, slk::Builder *res_builder);
+
+  static void LoadWal(storage::InMemoryStorage *storage, storage::replication::Decoder *decoder);
+
+  static uint64_t ReadAndApplyDelta(storage::InMemoryStorage *storage, storage::durability::BaseDecoder *decoder,
+                                    uint64_t version);
+};
+
+}  // namespace memgraph::dbms

src/dbms/inmemory/storage_helper.hpp

@@ -0,0 +1,67 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include <variant>
+
+#include "dbms/constants.hpp"
+#include "dbms/replication_handler.hpp"
+#include "replication/state.hpp"
+#include "storage/v2/config.hpp"
+#include "storage/v2/inmemory/storage.hpp"
+#include "storage/v2/storage.hpp"
+
+namespace memgraph::dbms {
+
+#ifdef MG_EXPERIMENTAL_REPLICATION_MULTITENANCY
+constexpr bool allow_mt_repl = true;
+#else
+constexpr bool allow_mt_repl = false;
+#endif
+
+inline std::unique_ptr<storage::Storage> CreateInMemoryStorage(
+    storage::Config config, const ::memgraph::replication::ReplicationState &repl_state) {
+  const auto wal_mode = config.durability.snapshot_wal_mode;
+  const auto name = config.name;
+  auto storage = std::make_unique<storage::InMemoryStorage>(std::move(config));
+
+  // Connect replication state and storage
+  storage->CreateSnapshotHandler(
+      [storage = storage.get(), &repl_state]() -> utils::BasicResult<storage::InMemoryStorage::CreateSnapshotError> {
+        if (repl_state.IsReplica()) {
+          return storage::InMemoryStorage::CreateSnapshotError::DisabledForReplica;
+        }
+        return storage->CreateSnapshot();
+      });
+
+  if (allow_mt_repl || name == dbms::kDefaultDB) {
+    // Handle global replication state
+    spdlog::info("Replication configuration will be stored and will be automatically restored in case of a crash.");
+    // RECOVER REPLICA CONNECTIONS
+    memgraph::dbms::RestoreReplication(repl_state, *storage);
+  } else if (const ::memgraph::replication::RoleMainData *data =
+                 std::get_if<::memgraph::replication::RoleMainData>(&repl_state.ReplicationData());
+             data && !data->registered_replicas_.empty()) {
+    spdlog::warn("Multi-tenant replication is currently not supported!");
+  }
+
+  if (wal_mode == storage::Config::Durability::SnapshotWalMode::DISABLED && repl_state.IsMain()) {
+    spdlog::warn(
+        "The instance has the MAIN replication role, but durability logs and snapshots are disabled. Please consider "
+        "enabling durability by using --storage-snapshot-interval-sec and --storage-wal-enabled flags because "
+        "without write-ahead logs this instance is not replicating any data.");
+  }
+
+  return std::move(storage);
+}
+
+}  // namespace memgraph::dbms

src/dbms/interp_handler.hpp

@@ -1,106 +0,0 @@
-// Copyright 2023 Memgraph Ltd.
-//
-// Use of this software is governed by the Business Source License
-// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
-// License, and you may not use this file except in compliance with the Business Source License.
-//
-// As of the Change Date specified in that file, in accordance with
-// the Business Source License, use of this software will be governed
-// by the Apache License, Version 2.0, included in the file
-// licenses/APL.txt.
-
-#pragma once
-
-#ifdef MG_ENTERPRISE
-
-#include "global.hpp"
-#include "query/auth_checker.hpp"
-#include "query/config.hpp"
-#include "query/interpreter.hpp"
-#include "storage/v2/storage.hpp"
-
-#include "handler.hpp"
-
-namespace memgraph::dbms {
-
-/**
- * @brief Simple class that adds useful information to the query's InterpreterContext
- *
- * @tparam T Multi-database handler type
- */
-template <typename T>
-class ExpandedInterpContext : public query::InterpreterContext {
- public:
-  template <typename... TArgs>
-  explicit ExpandedInterpContext(T &ref, TArgs &&...args)
-      : query::InterpreterContext(std::forward<TArgs>(args)...), sc_handler_(ref) {}
-
-  T &sc_handler_;  //!< Multi-database/SessionContext handler (used in some queries)
-};
-
-/**
- * @brief Simple structure that expands on the query's InterpreterConfig
- *
- */
-struct ExpandedInterpConfig {
-  storage::Config storage_config;          //!< Storage configuration
-  query::InterpreterConfig interp_config;  //!< Interpreter configuration
-};
-
-/**
- * @brief Multi-database interpreter context handler
- *
- * @tparam TSCHandler High-level multi-database/SessionContext handler type
- */
-template <typename TSCHandler>
-class InterpContextHandler : public Handler<ExpandedInterpContext<TSCHandler>, ExpandedInterpConfig> {
- public:
-  using InterpContextT = ExpandedInterpContext<TSCHandler>;
-  using HandlerT = Handler<InterpContextT, ExpandedInterpConfig>;
-
-  /**
-   * @brief Generate a new interpreter context associated with the passed name.
-   *
-   * @param name Name associating the new interpreter context
-   * @param sc_handler Multi-database/SessionContext handler used (some queries might use it)
-   * @param db Storage associated with the interpreter context
-   * @param config Interpreter's configuration
-   * @param dir Directory used by the interpreter
-   * @param auth_handler AuthQueryHandler used
-   * @param auth_checker AuthChecker used
-   * @return HandlerT::NewResult
-   */
-  typename HandlerT::NewResult New(const std::string &name, TSCHandler &sc_handler, storage::Config storage_config,
-                                   const query::InterpreterConfig &interpreter_config,
-                                   query::AuthQueryHandler &auth_handler, query::AuthChecker &auth_checker) {
-    // Check if compatible with the existing interpreters
-    if (std::any_of(HandlerT::cbegin(), HandlerT::cend(), [&](const auto &elem) {
-          const auto &config = elem.second.config().storage_config;
-          return config.durability.storage_directory == storage_config.durability.storage_directory;
-        })) {
-      spdlog::info("Tried to generate a new context using claimed directory and/or storage.");
-      return NewError::EXISTS;
-    }
-    const auto dir = storage_config.durability.storage_directory;
-    storage_config.name = name;  // Set storage id via config
-    return HandlerT::New(
-        name, std::forward_as_tuple(storage_config, interpreter_config),
-        std::forward_as_tuple(sc_handler, storage_config, interpreter_config, dir, &auth_handler, &auth_checker));
-  }
-
-  /**
-   * @brief All currently active storage.
-   *
-   * @return std::vector<std::string>
-   */
-  std::vector<std::string> All() const {
-    std::vector<std::string> res;
-    res.reserve(std::distance(HandlerT::cbegin(), HandlerT::cend()));
-    std::for_each(HandlerT::cbegin(), HandlerT::cend(), [&](const auto &elem) { res.push_back(elem.first); });
-    return res;
-  }
-};
-
-}  // namespace memgraph::dbms
-
-#endif

src/dbms/replication_handler.cpp

@@ -0,0 +1,234 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#include "dbms/replication_handler.hpp"
+
+#include "dbms/constants.hpp"
+#include "dbms/dbms_handler.hpp"
+#include "dbms/inmemory/replication_handlers.hpp"
+#include "dbms/inmemory/storage_helper.hpp"
+#include "replication/state.hpp"
+
+using memgraph::replication::ReplicationClientConfig;
+using memgraph::replication::ReplicationState;
+using memgraph::replication::RoleMainData;
+using memgraph::replication::RoleReplicaData;
+
+namespace memgraph::dbms {
+
+namespace {
+
+std::string RegisterReplicaErrorToString(RegisterReplicaError error) {
+  switch (error) {
+    using enum RegisterReplicaError;
+    case NAME_EXISTS:
+      return "NAME_EXISTS";
+    case END_POINT_EXISTS:
+      return "END_POINT_EXISTS";
+    case CONNECTION_FAILED:
+      return "CONNECTION_FAILED";
+    case COULD_NOT_BE_PERSISTED:
+      return "COULD_NOT_BE_PERSISTED";
+  }
+}
+}  // namespace
+
+bool ReplicationHandler::SetReplicationRoleMain() {
+  auto const main_handler = [](RoleMainData const &) {
+    // If we are already MAIN, we don't want to change anything
+    return false;
+  };
+  auto const replica_handler = [this](RoleReplicaData const &) {
+    // STEP 1) bring down all REPLICA servers
+    dbms_handler_.ForEach([](Database *db) {
+      auto *storage = db->storage();
+      // Remember old epoch + storage timestamp association
+      storage->PrepareForNewEpoch();
+    });
+
+    // STEP 2) Change to MAIN
+    // TODO: restore replication servers if false?
+    if (!repl_state_.SetReplicationRoleMain()) {
+      // TODO: Handle recovery on failure???
+      return false;
+    }
+
+    // STEP 3) We are now MAIN, update storage local epoch
+    dbms_handler_.ForEach([&](Database *db) {
+      auto *storage = db->storage();
+      storage->repl_storage_state_.epoch_ = std::get<RoleMainData>(std::as_const(repl_state_).ReplicationData()).epoch_;
+    });
+
+    return true;
+  };
+
+  // TODO: under lock
+  return std::visit(utils::Overloaded{main_handler, replica_handler}, repl_state_.ReplicationData());
+}
+
+bool ReplicationHandler::SetReplicationRoleReplica(const memgraph::replication::ReplicationServerConfig &config) {
+  // We don't want to restart the server if we're already a REPLICA
+  if (repl_state_.IsReplica()) {
+    return false;
+  }
+
+  // Remove registered replicas
+  dbms_handler_.ForEach([&](Database *db) {
+    auto *storage = db->storage();
+    storage->repl_storage_state_.replication_clients_.WithLock([](auto &clients) { clients.clear(); });
+  });
+
+  // Creates the server
+  repl_state_.SetReplicationRoleReplica(config);
+
+  // Start
+  const auto success =
+      std::visit(utils::Overloaded{[](auto) {
+                                     // ASSERT
+                                     return false;
+                                   },
+                                   [this](RoleReplicaData const &data) {
+                                     // Register handlers
+                                     InMemoryReplicationHandlers::Register(&dbms_handler_, *data.server);
+                                     if (!data.server->Start()) {
+                                       spdlog::error("Unable to start the replication server.");
+                                       return false;
+                                     }
+                                     return true;
+                                   }},
+                 repl_state_.ReplicationData());
+  // TODO Handle error (restore to main?)
+  return success;
+}
+
+auto ReplicationHandler::RegisterReplica(const memgraph::replication::ReplicationClientConfig &config)
+    -> memgraph::utils::BasicResult<RegisterReplicaError> {
+  MG_ASSERT(repl_state_.IsMain(), "Only main instance can register a replica!");
+
+  auto res = repl_state_.RegisterReplica(config);
+  switch (res) {
+    case memgraph::replication::RegisterReplicaError::NOT_MAIN:
+      MG_ASSERT(false, "Only main instance can register a replica!");
+      return {};
+    case memgraph::replication::RegisterReplicaError::NAME_EXISTS:
+      return memgraph::dbms::RegisterReplicaError::NAME_EXISTS;
+    case memgraph::replication::RegisterReplicaError::END_POINT_EXISTS:
+      return memgraph::dbms::RegisterReplicaError::END_POINT_EXISTS;
+    case memgraph::replication::RegisterReplicaError::COULD_NOT_BE_PERSISTED:
+      return memgraph::dbms::RegisterReplicaError::COULD_NOT_BE_PERSISTED;
+    case memgraph::replication::RegisterReplicaError::SUCCESS:
+      break;
+  }
+
+  bool all_clients_good = true;
+
+  if (!allow_mt_repl && dbms_handler_.All().size() > 1) {
+    spdlog::warn("Multi-tenant replication is currently not supported!");
+  }
+
+  dbms_handler_.ForEach([&](Database *db) {
+    auto *storage = db->storage();
+    if (!allow_mt_repl && storage->id() != kDefaultDB) {
+      return;
+    }
+    // TODO: ATM only IN_MEMORY_TRANSACTIONAL, fix other modes
+    if (storage->storage_mode_ != storage::StorageMode::IN_MEMORY_TRANSACTIONAL) return;
+
+    all_clients_good &=
+        storage->repl_storage_state_.replication_clients_.WithLock([storage, &config](auto &clients) -> bool {
+          auto client = storage->CreateReplicationClient(config, &storage->repl_storage_state_.epoch_);
+          client->Start();
+
+          if (client->State() == storage::replication::ReplicaState::INVALID) {
+            return false;
+          }
+          clients.push_back(std::move(client));
+          return true;
+        });
+  });
+  if (!all_clients_good) return RegisterReplicaError::CONNECTION_FAILED;  // TODO: this happen to 1 or many...what to do
+  return {};
+}
+
+auto ReplicationHandler::UnregisterReplica(std::string_view name) -> UnregisterReplicaResult {
+  auto const replica_handler = [](RoleReplicaData const &) -> UnregisterReplicaResult {
+    return UnregisterReplicaResult::NOT_MAIN;
+  };
+  auto const main_handler = [this, name](RoleMainData &mainData) -> UnregisterReplicaResult {
+    if (!repl_state_.TryPersistUnregisterReplica(name)) {
+      return UnregisterReplicaResult::COULD_NOT_BE_PERSISTED;
+    }
+    auto const n_unregistered =
+        std::erase_if(mainData.registered_replicas_,
+                      [&](ReplicationClientConfig const &registered_config) { return registered_config.name == name; });
+
+    dbms_handler_.ForEach([&](Database *db) {
+      db->storage()->repl_storage_state_.replication_clients_.WithLock(
+          [&](auto &clients) { std::erase_if(clients, [&](const auto &client) { return client->Name() == name; }); });
+    });
+
+    return n_unregistered != 0 ? UnregisterReplicaResult::SUCCESS : UnregisterReplicaResult::CAN_NOT_UNREGISTER;
+  };
+
+  return std::visit(utils::Overloaded{main_handler, replica_handler}, repl_state_.ReplicationData());
+}
+
+auto ReplicationHandler::GetRole() const -> memgraph::replication::ReplicationRole { return repl_state_.GetRole(); }
+
+bool ReplicationHandler::IsMain() const { return repl_state_.IsMain(); }
+
+bool ReplicationHandler::IsReplica() const { return repl_state_.IsReplica(); }
+
+void RestoreReplication(const replication::ReplicationState &repl_state, storage::Storage &storage) {
+  spdlog::info("Restoring replication role.");
+
+  /// MAIN
+  auto const recover_main = [&storage](RoleMainData const &mainData) {
+    for (const auto &config : mainData.registered_replicas_) {
+      spdlog::info("Replica {} restoration started for {}.", config.name, storage.id());
+
+      auto register_replica = [&storage](const memgraph::replication::ReplicationClientConfig &config)
+          -> memgraph::utils::BasicResult<RegisterReplicaError> {
+        return storage.repl_storage_state_.replication_clients_.WithLock(
+            [&storage, &config](auto &clients) -> utils::BasicResult<RegisterReplicaError> {
+              auto client = storage.CreateReplicationClient(config, &storage.repl_storage_state_.epoch_);
+              client->Start();
+
+              if (client->State() == storage::replication::ReplicaState::INVALID) {
+                spdlog::warn("Connection failed when registering replica {}. Replica will still be registered.",
+                             client->Name());
+              }
+              clients.push_back(std::move(client));
+              return {};
+            });
+      };
+
+      auto ret = register_replica(config);
+      if (ret.HasError()) {
+        MG_ASSERT(RegisterReplicaError::CONNECTION_FAILED != ret.GetError());
+        LOG_FATAL("Failure when restoring replica {}: {}.", config.name, RegisterReplicaErrorToString(ret.GetError()));
+      }
+      spdlog::info("Replica {} restored for {}.", config.name, storage.id());
+    }
+    spdlog::info("Replication role restored to MAIN.");
+  };
+
+  /// REPLICA
+  auto const recover_replica = [](RoleReplicaData const &data) { /*nothing to do*/ };
+
+  std::visit(
+      utils::Overloaded{
+          recover_main,
+          recover_replica,
+      },
+      std::as_const(repl_state).ReplicationData());
+}
+}  // namespace memgraph::dbms

src/dbms/replication_handler.hpp

@@ -0,0 +1,69 @@
+// Copyright 2023 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include "replication/role.hpp"
+#include "storage/v2/storage.hpp"
+#include "utils/result.hpp"
+
+// BEGIN fwd declares
+namespace memgraph::replication {
+struct ReplicationState;
+struct ReplicationServerConfig;
+struct ReplicationClientConfig;
+}  // namespace memgraph::replication
+
+namespace memgraph::dbms {
+class DbmsHandler;
+
+enum class RegisterReplicaError : uint8_t { NAME_EXISTS, END_POINT_EXISTS, CONNECTION_FAILED, COULD_NOT_BE_PERSISTED };
+enum class UnregisterReplicaResult : uint8_t {
+  NOT_MAIN,
+  COULD_NOT_BE_PERSISTED,
+  CAN_NOT_UNREGISTER,
+  SUCCESS,
+};
+
+/// A handler type that keep in sync current ReplicationState and the MAIN/REPLICA-ness of Storage
+/// TODO: extend to do multiple storages
+struct ReplicationHandler {
+  ReplicationHandler(memgraph::replication::ReplicationState &replState, DbmsHandler &dbms_handler)
+      : repl_state_(replState), dbms_handler_(dbms_handler) {}
+
+  // as REPLICA, become MAIN
+  bool SetReplicationRoleMain();
+
+  // as MAIN, become REPLICA
+  bool SetReplicationRoleReplica(const memgraph::replication::ReplicationServerConfig &config);
+
+  // as MAIN, define and connect to REPLICAs
+  auto RegisterReplica(const memgraph::replication::ReplicationClientConfig &config)
+      -> utils::BasicResult<RegisterReplicaError>;
+
+  // as MAIN, remove a REPLICA connection
+  auto UnregisterReplica(std::string_view name) -> UnregisterReplicaResult;
+
+  // Helper pass-through (TODO: remove)
+  auto GetRole() const -> memgraph::replication::ReplicationRole;
+  bool IsMain() const;
+  bool IsReplica() const;
+
+ private:
+  memgraph::replication::ReplicationState &repl_state_;
+  DbmsHandler &dbms_handler_;
+};
+
+/// A handler type that keep in sync current ReplicationState and the MAIN/REPLICA-ness of Storage
+/// TODO: extend to do multiple storages
+void RestoreReplication(const replication::ReplicationState &repl_state, storage::Storage &storage);
+
+}  // namespace memgraph::dbms

src/dbms/session_context.hpp

@@ -1,61 +0,0 @@
-// Copyright 2023 Memgraph Ltd.
-//
-// Use of this software is governed by the Business Source License
-// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
-// License, and you may not use this file except in compliance with the Business Source License.
-//
-// As of the Change Date specified in that file, in accordance with
-// the Business Source License, use of this software will be governed
-// by the Apache License, Version 2.0, included in the file
-// licenses/APL.txt.
-
-#pragma once
-
-#include "auth/auth.hpp"
-#include "query/interpreter.hpp"
-#include "storage/v2/storage.hpp"
-#include "utils/synchronized.hpp"
-
-#if MG_ENTERPRISE
-#include "audit/log.hpp"
-#endif
-namespace memgraph::dbms {
-
-/**
- * @brief Structure encapsulating storage and interpreter context.
- *
- * @note Each session contains a copy.
- */
-struct SessionContext {
-  // Explicit constructor here to ensure that pointers to all objects are
-  // supplied.
-
-  SessionContext(std::shared_ptr<memgraph::query::InterpreterContext> interpreter_context, std::string run,
-                 memgraph::utils::Synchronized<memgraph::auth::Auth, memgraph::utils::WritePrioritizedRWLock> *auth
-#ifdef MG_ENTERPRISE
-                 ,
-                 memgraph::audit::Log *audit_log
-#endif
-                 )
-      : interpreter_context(interpreter_context),
-        run_id(run),
-        auth(auth)
-#ifdef MG_ENTERPRISE
-        ,
-        audit_log(audit_log)
-#endif
-  {
-  }
-
-  std::shared_ptr<memgraph::query::InterpreterContext> interpreter_context;
-  std::string run_id;
-
-  // std::shared_ptr<AuthContext> auth_context;
-  memgraph::utils::Synchronized<memgraph::auth::Auth, memgraph::utils::WritePrioritizedRWLock> *auth;
-
-#ifdef MG_ENTERPRISE
-  memgraph::audit::Log *audit_log;
-#endif
-};
-
-}  // namespace memgraph::dbms

src/dbms/session_context_handler.hpp

@@ -1,603 +0,0 @@
-// Copyright 2023 Memgraph Ltd.
-//
-// Use of this software is governed by the Business Source License
-// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
-// License, and you may not use this file except in compliance with the Business Source License.
-//
-// As of the Change Date specified in that file, in accordance with
-// the Business Source License, use of this software will be governed
-// by the Apache License, Version 2.0, included in the file
-// licenses/APL.txt.
-
-#pragma once
-
-#include <algorithm>
-#include <concepts>
-#include <cstdint>
-#include <filesystem>
-#include <memory>
-#include <mutex>
-#include <optional>
-#include <ostream>
-#include <stdexcept>
-#include <system_error>
-#include <unordered_map>
-
-#include "constants.hpp"
-#include "global.hpp"
-#include "interp_handler.hpp"
-#include "query/auth_checker.hpp"
-#include "query/config.hpp"
-#include "query/interpreter.hpp"
-#include "session_context.hpp"
-#include "spdlog/spdlog.h"
-#include "storage/v2/durability/durability.hpp"
-#include "storage/v2/durability/paths.hpp"
-#include "utils/exceptions.hpp"
-#include "utils/file.hpp"
-#include "utils/logging.hpp"
-#include "utils/result.hpp"
-#include "utils/rw_lock.hpp"
-#include "utils/synchronized.hpp"
-#include "utils/uuid.hpp"
-
-#include "handler.hpp"
-
-namespace memgraph::dbms {
-
-#ifdef MG_ENTERPRISE
-
-using DeleteResult = utils::BasicResult<DeleteError>;
-
-/**
- * @brief Multi-database session contexts handler.
- */
-class SessionContextHandler {
- public:
-  using StorageT = storage::Storage;
-  using StorageConfigT = storage::Config;
-  using LockT = utils::RWLock;
-  using NewResultT = utils::BasicResult<NewError, SessionContext>;
-
-  struct Config {
-    StorageConfigT storage_config;           //!< Storage configuration
-    query::InterpreterConfig interp_config;  //!< Interpreter context configuration
-    std::function<void(utils::Synchronized<auth::Auth, utils::WritePrioritizedRWLock> *,
-                       std::unique_ptr<query::AuthQueryHandler> &, std::unique_ptr<query::AuthChecker> &)>
-        glue_auth;
-  };
-
-  struct Statistics {
-    uint64_t num_vertex;     //!< Sum of vertexes in every database
-    uint64_t num_edges;      //!< Sum of edges in every database
-    uint64_t num_databases;  //! number of isolated databases
-  };
-
-  /**
-   * @brief Initialize the handler.
-   *
-   * @param audit_log pointer to the audit logger (ENTERPRISE only)
-   * @param configs storage and interpreter configurations
-   * @param recovery_on_startup restore databases (and its content) and authentication data
-   */
-  SessionContextHandler(memgraph::audit::Log &audit_log, Config configs, bool recovery_on_startup, bool delete_on_drop)
-      : lock_{utils::RWLock::Priority::READ},
-        default_configs_(configs),
-        run_id_{utils::GenerateUUID()},
-        audit_log_(&audit_log),
-        delete_on_drop_(delete_on_drop) {
-    const auto &root = configs.storage_config.durability.storage_directory;
-    utils::EnsureDirOrDie(root);
-    // Verify that the user that started the process is the same user that is
-    // the owner of the storage directory.
-    storage::durability::VerifyStorageDirectoryOwnerAndProcessUserOrDie(root);
-
-    // Create the lock file and open a handle to it. This will crash the
-    // database if it can't open the file for writing or if any other process is
-    // holding the file opened.
-    lock_file_path_ = root / ".lock";
-    lock_file_handle_.Open(lock_file_path_, utils::OutputFile::Mode::OVERWRITE_EXISTING);
-    MG_ASSERT(lock_file_handle_.AcquireLock(),
-              "Couldn't acquire lock on the storage directory {}"
-              "!\nAnother Memgraph process is currently running with the same "
-              "storage directory, please stop it first before starting this "
-              "process!",
-              root);
-
-    // TODO: Figure out if this is needed/wanted
-    // Clear auth database since we are not recovering
-    // if (!recovery_on_startup) {
-    //   const auto &auth_dir = root / "auth";
-    //   // Backup if auth present
-    //   if (utils::DirExists(auth_dir)) {
-    //     auto backup_dir = root / storage::durability::kBackupDirectory;
-    //     std::error_code error_code;
-    //     utils::EnsureDirOrDie(backup_dir);
-    //     std::error_code ec;
-    //     const auto now = std::chrono::system_clock::now();
-    //     std::ostringstream os;
-    //     os << now.time_since_epoch().count();
-    //     std::filesystem::rename(auth_dir, backup_dir / ("auth-" + os.str()), ec);
-    //     MG_ASSERT(!ec, "Couldn't backup auth directory because of: {}", ec.message());
-    //     spdlog::warn(
-    //         "Since Memgraph was not supposed to recover on startup the authentication files will be "
-    //         "overwritten. To prevent important data loss, Memgraph has stored those files into .backup directory "
-    //         "inside the storage directory.");
-    //   }
-
-    //   // Clear
-    //   if (std::filesystem::exists(auth_dir)) {
-    //     std::filesystem::remove_all(auth_dir);
-    //   }
-    // }
-
-    // Lazy initialization of auth_
-    auth_ = std::make_unique<utils::Synchronized<auth::Auth, utils::WritePrioritizedRWLock>>(root / "auth");
-    configs.glue_auth(auth_.get(), auth_handler_, auth_checker_);
-
-    // TODO: Decouple storage config from dbms config
-    // TODO: Save individual db configs inside the kvstore and restore from there
-    storage::UpdatePaths(default_configs_->storage_config,
-                         default_configs_->storage_config.durability.storage_directory / "databases");
-    const auto &db_dir = default_configs_->storage_config.durability.storage_directory;
-    const auto durability_dir = db_dir / ".durability";
-    utils::EnsureDirOrDie(db_dir);
-    utils::EnsureDirOrDie(durability_dir);
-    durability_ = std::make_unique<kvstore::KVStore>(durability_dir);
-
-    // Generate the default database
-    MG_ASSERT(!NewDefault_().HasError(), "Failed while creating the default DB.");
-
-    // Recover previous databases
-    if (recovery_on_startup) {
-      for (const auto &[name, _] : *durability_) {
-        if (name == kDefaultDB) continue;  // Already set
-        spdlog::info("Restoring database {}.", name);
-        MG_ASSERT(!New_(name).HasError(), "Failed while creating database {}.", name);
-        spdlog::info("Database {} restored.", name);
-      }
-    } else {  // Clear databases from the durability list and auth
-      auto locked_auth = auth_->Lock();
-      for (const auto &[name, _] : *durability_) {
-        if (name == kDefaultDB) continue;
-        locked_auth->DeleteDatabase(name);
-        durability_->Delete(name);
-      }
-    }
-  }
-
-  void Shutdown() {
-    for (auto &ic : interp_handler_) memgraph::query::Shutdown(ic.second.get().get());
-  }
-
-  /**
-   * @brief Create a new SessionContext associated with the "name" database
-   *
-   * @param name name of the database
-   * @return NewResultT context on success, error on failure
-   */
-  NewResultT New(const std::string &name) {
-    std::lock_guard<LockT> wr(lock_);
-    return New_(name, name);
-  }
-
-  /**
-   * @brief Get the context associated with the "name" database
-   *
-   * @param name
-   * @return SessionContext
-   * @throw UnknownDatabaseException if getting unknown database
-   */
-  SessionContext Get(const std::string &name) {
-    std::shared_lock<LockT> rd(lock_);
-    return Get_(name);
-  }
-
-  /**
-   * @brief Set the undelying database for a particular session.
-   *
-   * @param uuid unique session identifier
-   * @param db_name unique database name
-   * @return SetForResult enum
-   * @throws UnknownDatabaseException, UnknownSessionException or anything OnChange throws
-   */
-  SetForResult SetFor(const std::string &uuid, const std::string &db_name) {
-    std::shared_lock<LockT> rd(lock_);
-    (void)Get_(
-        db_name);  // throws if db doesn't exist (TODO: Better to pass it via OnChange - but injecting dependency)
-    try {
-      auto &s = sessions_.at(uuid);
-      return s.OnChange(db_name);
-    } catch (std::out_of_range &) {
-      throw UnknownSessionException("Unknown session \"{}\"", uuid);
-    }
-  }
-
-  /**
-   * @brief Set the undelying database from a session itself. SessionContext handler.
-   *
-   * @param db_name unique database name
-   * @param handler function that gets called in place with the appropriate SessionContext
-   * @return SetForResult enum
-   */
-  template <typename THandler>
-  requires std::invocable<THandler, SessionContext> SetForResult SetInPlace(const std::string &db_name,
-                                                                            THandler handler) {
-    std::shared_lock<LockT> rd(lock_);
-    return handler(Get_(db_name));
-  }
-
-  /**
-   * @brief Call void handler under a shared lock.
-   *
-   * @param handler function that gets called in place
-   */
-  template <typename THandler>
-  requires std::invocable<THandler>
-  void CallInPlace(THandler handler) {
-    std::shared_lock<LockT> rd(lock_);
-    handler();
-  }
-
-  /**
-   * @brief Register an active session (used to handle callbacks).
-   *
-   * @param session
-   * @return true on success
-   */
-  bool Register(SessionInterface &session) {
-    std::lock_guard<LockT> wr(lock_);
-    auto [_, success] = sessions_.emplace(session.UUID(), session);
-    return success;
-  }
-
-  /**
-   * @brief Delete a session.
-   *
-   * @param session
-   */
-  bool Delete(const SessionInterface &session) {
-    std::lock_guard<LockT> wr(lock_);
-    return sessions_.erase(session.UUID()) > 0;
-  }
-
-  /**
-   * @brief Delete database.
-   *
-   * @param db_name database name
-   * @return DeleteResult error on failure
-   */
-  DeleteResult Delete(const std::string &db_name) {
-    std::lock_guard<LockT> wr(lock_);
-    if (db_name == kDefaultDB) {
-      // MSG cannot delete the default db
-      return DeleteError::DEFAULT_DB;
-    }
-    // Check if db exists
-    try {
-      auto sc = Get_(db_name);
-      // Check if a session is using the db
-      if (!sc.interpreter_context->interpreters->empty()) {
-        return DeleteError::USING;
-      }
-    } catch (UnknownDatabaseException &) {
-      return DeleteError::NON_EXISTENT;
-    }
-
-    // High level handlers
-    for (auto &[_, s] : sessions_) {
-      if (!s.OnDelete(db_name)) {
-        spdlog::error("Partial failure while deleting database \"{}\".", db_name);
-        defunct_dbs_.emplace(db_name);
-        return DeleteError::FAIL;
-      }
-    }
-
-    // Low level handlers
-    const auto storage_path = StorageDir_(db_name);
-    MG_ASSERT(storage_path, "Missing storage for {}", db_name);
-    if (!interp_handler_.Delete(db_name)) {
-      spdlog::error("Partial failure while deleting database \"{}\".", db_name);
-      defunct_dbs_.emplace(db_name);
-      return DeleteError::FAIL;
-    }
-
-    // Remove from auth
-    auth_->Lock()->DeleteDatabase(db_name);
-    // Remove from durability list
-    if (durability_) durability_->Delete(db_name);
-
-    // Delete disk storage
-    if (delete_on_drop_) {
-      std::error_code ec;
-      (void)std::filesystem::remove_all(*storage_path, ec);
-      if (ec) {
-        spdlog::error("Failed to clean disk while deleting database \"{}\".", db_name);
-        defunct_dbs_.emplace(db_name);
-        return DeleteError::DISK_FAIL;
-      }
-    }
-
-    // Delete from defunct_dbs_ (in case a second delete call was successful)
-    defunct_dbs_.erase(db_name);
-
-    return {};  // Success
-  }
-
-  /**
-   * @brief Set the default configurations.
-   *
-   * @param configs storage, interpreter and authorization configurations
-   */
-  void SetDefaultConfigs(Config configs) {
-    std::lock_guard<LockT> wr(lock_);
-    default_configs_ = configs;
-  }
-
-  /**
-   * @brief Get the default configurations.
-   *
-   * @return std::optional<Config>
-   */
-  std::optional<Config> GetDefaultConfigs() const {
-    std::shared_lock<LockT> rd(lock_);
-    return default_configs_;
-  }
-
-  /**
-   * @brief Return all active databases.
-   *
-   * @return std::vector<std::string>
-   */
-  std::vector<std::string> All() const {
-    std::shared_lock<LockT> rd(lock_);
-    return interp_handler_.All();
-  }
-
-  /**
-   * @brief Return the number of vertex across all databases.
-   *
-   * @return uint64_t
-   */
-  Statistics Info() const {
-    // TODO: Handle overflow
-    uint64_t nv = 0;
-    uint64_t ne = 0;
-    std::shared_lock<LockT> rd(lock_);
-    const uint64_t ndb = std::distance(interp_handler_.cbegin(), interp_handler_.cend());
-    for (const auto &ic : interp_handler_) {
-      const auto &info = ic.second.get()->db->GetInfo();
-      nv += info.vertex_count;
-      ne += info.edge_count;
-    }
-    return {nv, ne, ndb};
-  }
-
-  /**
-   * @brief Return the currently active database for a particular session.
-   *
-   * @param uuid session's unique identifier
-   * @return std::string name of the database
-   * @throw
-   */
-  std::string Current(const std::string &uuid) const {
-    std::shared_lock<LockT> rd(lock_);
-    return sessions_.at(uuid).GetDatabaseName();
-  }
-
-  /**
-   * @brief Restore triggers for all currently defined databases.
-   * @note: Triggers can execute query procedures, so we need to reload the modules first and then the triggers
-   */
-  void RestoreTriggers() {
-    std::lock_guard<LockT> wr(lock_);
-    for (auto &ic_itr : interp_handler_) {
-      auto ic = ic_itr.second.get();
-      spdlog::debug("Restoring trigger for database \"{}\"", ic->db->id());
-      auto storage_accessor = ic->db->Access();
-      auto dba = memgraph::query::DbAccessor{storage_accessor.get()};
-      ic->trigger_store.RestoreTriggers(&ic->ast_cache, &dba, ic->config.query, ic->auth_checker);
-    }
-  }
-
-  /**
-   * @brief Restore streams of all currently defined databases.
-   * @note: Stream transformations are using modules, they have to be restored after the query modules are loaded.
-   */
-  void RestoreStreams() {
-    std::lock_guard<LockT> wr(lock_);
-    for (auto &ic_itr : interp_handler_) {
-      auto ic = ic_itr.second.get();
-      spdlog::debug("Restoring streams for database \"{}\"", ic->db->id());
-      ic->streams.RestoreStreams();
-    }
-  }
-
- private:
-  std::optional<std::filesystem::path> StorageDir_(const std::string &name) const {
-    const auto conf = interp_handler_.GetConfig(name);
-    if (conf) {
-      return conf->storage_config.durability.storage_directory;
-    }
-    spdlog::debug("Failed to find storage dir for database \"{}\"", name);
-    return {};
-  }
-
-  /**
-   * @brief Create a new SessionContext associated with the "name" database
-   *
-   * @param name name of the database
-   * @return NewResultT context on success, error on failure
-   */
-  NewResultT New_(const std::string &name) { return New_(name, name); }
-
-  /**
-   * @brief Create a new SessionContext associated with the "name" database
-   *
-   * @param name name of the database
-   * @param storage_subdir undelying RocksDB directory
-   * @return NewResultT context on success, error on failure
-   */
-  NewResultT New_(const std::string &name, std::filesystem::path storage_subdir) {
-    if (default_configs_) {
-      auto storage = default_configs_->storage_config;
-      storage::UpdatePaths(storage, storage.durability.storage_directory / storage_subdir);
-      return New_(name, storage, default_configs_->interp_config);
-    }
-    spdlog::info("Trying to generate session context without any configurations.");
-    return NewError::NO_CONFIGS;
-  }
-
-  /**
-   * @brief Create a new SessionContext associated with the "name" database
-   *
-   * @param name name of the database
-   * @param storage_config storage configuration
-   * @param inter_config interpreter configuration
-   * @return NewResultT context on success, error on failure
-   */
-  NewResultT New_(const std::string &name, StorageConfigT &storage_config, query::InterpreterConfig &inter_config/*,
-                  const std::string &ah_flags*/) {
-    MG_ASSERT(auth_handler_, "No high level AuthQueryHandler has been supplied.");
-    MG_ASSERT(auth_checker_, "No high level AuthChecker has been supplied.");
-
-    if (defunct_dbs_.contains(name)) {
-      spdlog::warn("Failed to generate database due to the unknown state of the previously defunct database \"{}\".",
-                   name);
-      return NewError::DEFUNCT;
-    }
-
-    auto new_interp = interp_handler_.New(name, *this, storage_config, inter_config, *auth_handler_, *auth_checker_);
-
-    if (new_interp.HasValue()) {
-      // Success
-      if (durability_) durability_->Put(name, "ok");
-      return SessionContext{new_interp.GetValue(), run_id_, auth_.get(), audit_log_};
-    }
-    return new_interp.GetError();
-  }
-
-  /**
-   * @brief Create a new SessionContext associated with the default database
-   *
-   * @return NewResultT context on success, error on failure
-   */
-  NewResultT NewDefault_() {
-    // Create the default DB in the root (this is how it was done pre multi-tenancy)
-    auto res = New_(kDefaultDB, "..");
-    if (res.HasValue()) {
-      // For back-compatibility...
-      // Recreate the dbms layout for the default db and symlink to the root
-      const auto dir = StorageDir_(kDefaultDB);
-      MG_ASSERT(dir, "Failed to find storage path.");
-      const auto main_dir = *dir / "databases" / kDefaultDB;
-
-      if (!std::filesystem::exists(main_dir)) {
-        std::filesystem::create_directory(main_dir);
-      }
-
-      // Force link on-disk directories
-      const auto conf = interp_handler_.GetConfig(kDefaultDB);
-      MG_ASSERT(conf, "No configuration for the default database.");
-      const auto &tmp_conf = conf->storage_config.disk;
-      std::vector<std::filesystem::path> to_link{
-          tmp_conf.main_storage_directory,         tmp_conf.label_index_directory,
-          tmp_conf.label_property_index_directory, tmp_conf.unique_constraints_directory,
-          tmp_conf.name_id_mapper_directory,       tmp_conf.id_name_mapper_directory,
-          tmp_conf.durability_directory,           tmp_conf.wal_directory,
-      };
-
-      // Add in-memory paths
-      // Some directories are redundant (skip those)
-      const std::vector<std::string> skip{".lock", "audit_log", "auth", "databases", "internal_modules", "settings"};
-      for (auto const &item : std::filesystem::directory_iterator{*dir}) {
-        const auto dir_name = std::filesystem::relative(item.path(), item.path().parent_path());
-        if (std::find(skip.begin(), skip.end(), dir_name) != skip.end()) continue;
-        to_link.push_back(item.path());
-      }
-
-      // Symlink to root dir
-      for (auto const &item : to_link) {
-        const auto dir_name = std::filesystem::relative(item, item.parent_path());
-        const auto link = main_dir / dir_name;
-        const auto to = std::filesystem::relative(item, main_dir);
-        if (!std::filesystem::is_symlink(link) && !std::filesystem::exists(link)) {
-          std::filesystem::create_directory_symlink(to, link);
-        } else {  // Check existing link
-          std::error_code ec;
-          const auto test_link = std::filesystem::read_symlink(link, ec);
-          if (ec || test_link != to) {
-            MG_ASSERT(false,
-                      "Memgraph storage directory incompatible with new version.\n"
-                      "Please use a clean directory or remove \"{}\" and try again.",
-                      link.string());
-          }
-        }
-      }
-    }
-    return res;
-  }
-
-  /**
-   * @brief Get the context associated with the "name" database
-   *
-   * @param name
-   * @return SessionContext
-   * @throw UnknownDatabaseException if trying to get unknown database
-   */
-  SessionContext Get_(const std::string &name) {
-    auto interp = interp_handler_.Get(name);
-    if (interp) {
-      return SessionContext{*interp, run_id_, auth_.get(), audit_log_};
-    }
-    throw UnknownDatabaseException("Tried to retrieve an unknown database \"{}\".", name);
-  }
-
-  // Should storage objects ever be deleted?
-  mutable LockT lock_;                                          //!< protective lock
-  std::filesystem::path lock_file_path_;                        //!< Lock file protecting the main storage
-  utils::OutputFile lock_file_handle_;                          //!< Handler the lock (crash if already open)
-  InterpContextHandler<SessionContextHandler> interp_handler_;  //!< multi-tenancy interpreter handler
-  // AuthContextHandler auth_handler_; //!< multi-tenancy authorization handler (currently we use a single global
-  // auth)
-  std::unique_ptr<utils::Synchronized<auth::Auth, utils::WritePrioritizedRWLock>> auth_;
-  std::unique_ptr<query::AuthQueryHandler> auth_handler_;
-  std::unique_ptr<query::AuthChecker> auth_checker_;
-  std::optional<Config> default_configs_;                         //!< default storage and interpreter configurations
-  const std::string run_id_;                                      //!< run's unique identifier (auto generated)
-  memgraph::audit::Log *audit_log_;                               //!< pointer to the audit logger
-  std::unordered_map<std::string, SessionInterface &> sessions_;  //!< map of active/registered sessions
-  std::unique_ptr<kvstore::KVStore> durability_;  //!< list of active dbs (pointer so we can postpone its creation)
-
-  std::set<std::string> defunct_dbs_;  //!< Databases that are in an unknown state due to various failures
-  bool delete_on_drop_;                //!< Flag defining if dropping storage also deletes its directory
- public:
-  static SessionContextHandler &ExtractSCH(query::InterpreterContext *interpreter_context) {
-    return static_cast<typename decltype(interp_handler_)::InterpContextT *>(interpreter_context)->sc_handler_;
-  }
-};
-
-#else
-/**
- * @brief Initialize the handler.
- *
- * @param auth pointer to the authenticator
- * @param configs storage and interpreter configurations
- */
-static inline SessionContext Init(storage::Config &storage_config, query::InterpreterConfig &interp_config,
-                                  utils::Synchronized<auth::Auth, utils::WritePrioritizedRWLock> *auth,
-                                  query::AuthQueryHandler *auth_handler, query::AuthChecker *auth_checker) {
-  MG_ASSERT(auth, "Passed a nullptr auth");
-  MG_ASSERT(auth_handler, "Passed a nullptr auth_handler");
-  MG_ASSERT(auth_checker, "Passed a nullptr auth_checker");
-
-  storage_config.name = kDefaultDB;
-  auto interp_context = std::make_shared<query::InterpreterContext>(
-      storage_config, interp_config, storage_config.durability.storage_directory, auth_handler, auth_checker);
-  MG_ASSERT(interp_context, "Failed to construct main interpret context.");
-
-  return SessionContext{interp_context, utils::GenerateUUID(), auth};
-}
-#endif
-
-}  // namespace memgraph::dbms