071df2f439
* Split queries into system and data queries * System queries are sequentially executed and generate separate transaction deltas * System transaction try locks for 100ms * last_commited_system_ts saved to DBMS durability * Replicating CREATE/DROP DATABASE * Sending a system snapshot if REPLICA behind * Passing a copy of the gatekeeper::access as std::any to all functions that could call an async execution * Removed delete_on_drop flag (we now always delete on drop) * Using UUID as the directory name for databases * DBMS durability update (added versioning and salient information) * Automatic migration from previous version * Interpreter can run some queries without a target database * SHOW REPLICA returns the status of the currently active DB * Returning UUID instead of db name in the RPC responses * Using UUIDs for database specification in RPC (not name) * FrequentCheck forces update on reconnect * TimestampRpc will detect if a replica is behind, and will update client's state * Safer SLK reads * Split SHOW DATABASES in two SHOW DATABASES (list of current databases) and SHOW DATABASE a single string naming the current database --------- Co-authored-by: Gareth Lloyd <gareth.lloyd@memgraph.io>
96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
// Copyright 2023 Memgraph Ltd.
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//
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// Use of this software is governed by the Business Source License
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// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
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// License, and you may not use this file except in compliance with the Business Source License.
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//
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// As of the Change Date specified in that file, in accordance with
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// the Business Source License, use of this software will be governed
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// by the Apache License, Version 2.0, included in the file
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// licenses/APL.txt.
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#pragma once
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#ifdef MG_ENTERPRISE
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#include <algorithm>
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#include <filesystem>
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#include <iterator>
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#include <memory>
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#include <optional>
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#include <string_view>
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#include <unordered_map>
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#include "dbms/database.hpp"
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#include "handler.hpp"
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namespace memgraph::dbms {
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/* NOTE
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* The Database object is shared. All the higher-level function calls should be protected.
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* Storage function calls should already be protected; add protection where needed.
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*
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* Current implementation uses a handler of Database objects. It owns them and gives
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* Gatekeeper::Accessor to it. These guarantee that the object won't be
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* destroyed unless no one is using it.
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*/
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/**Config
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* @brief Multi-database storage handler
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*
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*/
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class DatabaseHandler : public Handler<Database> {
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public:
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using HandlerT = Handler<Database>;
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/**
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* @brief Generate new storage associated with the passed name.
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*
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* @param name Name associating the new interpreter context
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* @param config Storage configuration
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* @return HandlerT::NewResult
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*/
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HandlerT::NewResult New(storage::Config config, replication::ReplicationState &repl_state) {
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// Control that no one is using the same data directory
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if (std::any_of(begin(), end(), [&](auto &elem) {
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auto db_acc = elem.second.access();
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MG_ASSERT(db_acc.has_value(), "Gatekeeper in invalid state");
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return db_acc->get()->config().durability.storage_directory == config.durability.storage_directory;
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})) {
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spdlog::info("Tried to generate new storage using a claimed directory.");
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return NewError::EXISTS;
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}
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return HandlerT::New(std::piecewise_construct, config.salient.name, config, repl_state);
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}
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/**
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* @brief All currently active storage.
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*
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* @return std::vector<std::string>
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*/
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std::vector<std::string> All() const {
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std::vector<std::string> res;
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res.reserve(std::distance(cbegin(), cend()));
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std::for_each(cbegin(), cend(), [&](const auto &elem) { res.push_back(elem.first); });
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return res;
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}
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/**
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* @brief Get the associated storage's configuration
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*
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* @param name
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* @return std::optional<storage::Config>
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*/
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std::optional<storage::Config> GetConfig(std::string_view name) {
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auto db = Get(name);
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if (db) {
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return (*db)->config();
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}
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return std::nullopt;
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}
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};
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} // namespace memgraph::dbms
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#endif
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