fix compile error in tests.

ci: enable

.travis.yml

@@ -0,0 +1,30 @@
+os:
+  - linux
+
+language: go
+
+go:
+  - 1.12.x
+
+env:
+  global:
+    - GOTFLAGS="-race"
+  matrix:
+    - BUILD_DEPTYPE=gomod
+
+
+# disable travis install
+install:
+  - true
+
+script:
+  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)
+
+
+cache:
+  directories:
+    - $GOPATH/pkg/mod
+    - $HOME/.cache/go-build
+
+notifications:
+  email: false

basic.go

@@ -6,17 +6,46 @@ import (
 	"reflect"
 	"sync"
 	"sync/atomic"
+
+	"github.com/libp2p/go-libp2p-core/event"
 )
 
 ///////////////////////
 // BUS
 
+// basicBus is a type-based event delivery system
 type basicBus struct {
 	lk    sync.Mutex
 	nodes map[reflect.Type]*node
 }
 
-func NewBus() *basicBus {
+var _ event.Bus = (*basicBus)(nil)
+
+type Emitter struct {
+	n       *node
+	typ     reflect.Type
+	closed  int32
+	dropper func(reflect.Type)
+}
+
+func (e *Emitter) Emit(evt interface{}) {
+	if atomic.LoadInt32(&e.closed) != 0 {
+		panic("emitter is closed")
+	}
+	e.n.emit(evt)
+}
+
+func (e *Emitter) Close() error {
+	if !atomic.CompareAndSwapInt32(&e.closed, 0, 1) {
+		panic("closed an emitter more than once")
+	}
+	if atomic.AddInt32(&e.n.nEmitters, -1) == 0 {
+		e.dropper(e.typ)
+	}
+	return nil
+}
+
+func NewBus() event.Bus {
 	return &basicBus{
 		nodes: map[reflect.Type]*node{},
 	}
@@ -64,7 +93,16 @@ func (b *basicBus) tryDropNode(typ reflect.Type) {
 	b.lk.Unlock()
 }
 
-func (b *basicBus) Subscribe(typedChan interface{}, opts ...SubOption) (c CancelFunc, err error) {
+// Subscribe creates new subscription. Failing to drain the channel will cause
+// publishers to get blocked. CancelFunc is guaranteed to return after last send
+// to the channel
+//
+// Example:
+// ch := make(chan EventT, 10)
+// defer close(ch)
+// cancel, err := eventbus.Subscribe(ch)
+// defer cancel()
+func (b *basicBus) Subscribe(typedChan interface{}, opts ...event.SubscriptionOpt) (c event.CancelFunc, err error) {
 	var settings subSettings
 	for _, opt := range opts {
 		if err := opt(&settings); err != nil {
@@ -118,10 +156,22 @@ func (b *basicBus) Subscribe(typedChan interface{}, opts ...SubOption) (c Cancel
 	return
 }
 
-func (b *basicBus) Emitter(evtType interface{}, opts ...EmitterOption) (e EmitFunc, err error) {
+// Emitter creates new emitter
+//
+// eventType accepts typed nil pointers, and uses the type information to
+// select output type
+//
+// Example:
+// emit, err := eventbus.Emitter(new(EventT))
+// defer emit.Close() // MUST call this after being done with the emitter
+//
+// emit(EventT{})
+func (b *basicBus) Emitter(evtType interface{}, opts ...event.EmitterOpt) (e event.Emitter, err error) {
 	var settings emitterSettings
 	for _, opt := range opts {
-		opt(&settings)
+		if err := opt(&settings); err != nil {
+			return nil, err
+		}
 	}
 
 	typ := reflect.TypeOf(evtType)
@@ -132,22 +182,8 @@ func (b *basicBus) Emitter(evtType interface{}, opts ...EmitterOption) (e EmitFu
 
 	err = b.withNode(typ, func(n *node) {
 		atomic.AddInt32(&n.nEmitters, 1)
-		closed := false
 		n.keepLast = n.keepLast || settings.makeStateful
-
-		e = func(event interface{}) {
-			if closed {
-				panic("emitter is closed")
-			}
-			if event == closeEmit {
-				closed = true
-				if atomic.AddInt32(&n.nEmitters, -1) == 0 {
-					b.tryDropNode(typ)
-				}
-				return
-			}
-			n.emit(event)
-		}
+		e = &Emitter{n: n, typ: typ, dropper: b.tryDropNode}
 	}, func(_ *node) {})
 	return
 }
@@ -192,8 +228,3 @@ func (n *node) emit(event interface{}) {
 	}
 	n.lk.RUnlock()
 }
-
-///////////////////////
-// UTILS
-
-var _ Bus = &basicBus{}

basic_test.go

@@ -38,13 +38,13 @@ func TestEmit(t *testing.T) {
 		<-events
 	}()
 
-	emit, err := bus.Emitter(new(EventA))
+	em, err := bus.Emitter(new(EventA))
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer emit.Close()
+	defer em.Close()
 
-	emit(EventA{})
+	em.Emit(EventA{})
 }
 
 func TestSub(t *testing.T) {
@@ -66,13 +66,13 @@ func TestSub(t *testing.T) {
 		wait.Done()
 	}()
 
-	emit, err := bus.Emitter(new(EventB))
+	em, err := bus.Emitter(new(EventB))
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer emit.Close()
+	defer em.Close()
 
-	emit(EventB(7))
+	em.Emit(EventB(7))
 	wait.Wait()
 
 	if event != 7 {
@@ -83,23 +83,23 @@ func TestSub(t *testing.T) {
 func TestEmitNoSubNoBlock(t *testing.T) {
 	bus := NewBus()
 
-	emit, err := bus.Emitter(new(EventA))
+	em, err := bus.Emitter(new(EventA))
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer emit.Close()
+	defer em.Close()
 
-	emit(EventA{})
+	em.Emit(EventA{})
 }
 
 func TestEmitOnClosed(t *testing.T) {
 	bus := NewBus()
 
-	emit, err := bus.Emitter(new(EventA))
+	em, err := bus.Emitter(new(EventA))
 	if err != nil {
 		t.Fatal(err)
 	}
-	emit.Close()
+	em.Close()
 
 	defer func() {
 		r := recover()
@@ -111,7 +111,7 @@ func TestEmitOnClosed(t *testing.T) {
 		}
 	}()
 
-	emit(EventA{})
+	em.Emit(EventA{})
 }
 
 func TestClosingRaces(t *testing.T) {
@@ -156,7 +156,7 @@ func TestClosingRaces(t *testing.T) {
 
 	wg.Wait()
 
-	if len(b.nodes) != 0 {
+	if len(b.(*basicBus).nodes) != 0 {
 		t.Error("expected no nodes")
 	}
 }
@@ -187,15 +187,15 @@ func TestSubMany(t *testing.T) {
 		}()
 	}
 
-	emit, err := bus.Emitter(new(EventB))
+	em, err := bus.Emitter(new(EventB))
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer emit.Close()
+	defer em.Close()
 
 	ready.Wait()
 
-	emit(EventB(7))
+	em.Emit(EventB(7))
 	wait.Wait()
 
 	if int(r) != 7*n {
@@ -222,13 +222,13 @@ func TestSubType(t *testing.T) {
 		wait.Done()
 	}()
 
-	emit, err := bus.Emitter(new(EventA))
+	em, err := bus.Emitter(new(EventA))
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer emit.Close()
+	defer em.Close()
 
-	emit(EventA{})
+	em.Emit(EventA{})
 	wait.Wait()
 
 	if event.String() != "Oh, Hello" {
@@ -238,11 +238,11 @@ func TestSubType(t *testing.T) {
 
 func TestNonStateful(t *testing.T) {
 	bus := NewBus()
-	emit, err := bus.Emitter(new(EventB))
+	em, err := bus.Emitter(new(EventB))
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer emit.Close()
+	defer em.Close()
 
 	eventsA := make(chan EventB, 1)
 	cancelS, err := bus.Subscribe(eventsA)
@@ -257,7 +257,7 @@ func TestNonStateful(t *testing.T) {
 	default:
 	}
 
-	emit(EventB(1))
+	em.Emit(EventB(1))
 
 	select {
 	case e := <-eventsA:
@@ -284,13 +284,13 @@ func TestNonStateful(t *testing.T) {
 
 func TestStateful(t *testing.T) {
 	bus := NewBus()
-	emit, err := bus.Emitter(new(EventB), Stateful)
+	em, err := bus.Emitter(new(EventB), Stateful)
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer emit.Close()
+	defer em.Close()
 
-	emit(EventB(2))
+	em.Emit(EventB(2))
 
 	eventsA := make(chan EventB, 1)
 	cancelS, err := bus.Subscribe(eventsA)
@@ -337,18 +337,19 @@ func testMany(t testing.TB, subs, emits, msgs int, stateful bool) {
 
 	for i := 0; i < emits; i++ {
 		go func() {
-			emit, err := bus.Emitter(new(EventB), func(settings *emitterSettings) {
-				settings.makeStateful = stateful
+			em, err := bus.Emitter(new(EventB), func(settings interface{}) error {
+				settings.(*emitterSettings).makeStateful = stateful
+				return nil
 			})
 			if err != nil {
 				panic(err)
 			}
-			defer emit.Close()
+			defer em.Close()
 
 			ready.Wait()
 
 			for i := 0; i < msgs; i++ {
-				emit(EventB(97))
+				em.Emit(EventB(97))
 			}
 
 			wait.Done()

codecov.yml

@@ -0,0 +1,3 @@
+coverage:
+  range: "50...100"
+comment: off

go.mod

@@ -2,4 +2,7 @@ module github.com/libp2p/go-eventbus
 
 go 1.12
 
-require github.com/jbenet/go-detect-race v0.0.0-20150302022421-3463798d9574
+require (
+	github.com/jbenet/go-detect-race v0.0.0-20150302022421-3463798d9574
+	github.com/libp2p/go-libp2p-core v0.0.4-0.20190619144953-3605e610067d
+)

go.sum

@@ -1,2 +1,79 @@
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+github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
+github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA=
+github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
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+github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVaaLLH7j4eDXPRvw78tMflu7Ie2bzYOH4Y8rRKBY=
+github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
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+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190219092855-153ac476189d/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

interface.go

@@ -1,96 +0,0 @@
-package event
-
-import (
-	"errors"
-	"reflect"
-)
-
-var closeEmit struct{}
-
-type subSettings struct {
-	forcedType reflect.Type
-}
-
-type SubOption func(interface{}) error
-
-// ForceSubType is a Subscribe option which overrides the type to which
-// the subscription will be done. Note that the evtType must be assignable
-// to channel type.
-//
-// This also allows for subscribing to multiple eventbus channels with one
-// Go channel to get better ordering guarantees.
-//
-// Example:
-// type Event struct{}
-// func (Event) String() string {
-//    return "event"
-// }
-//
-// eventCh := make(chan fmt.Stringer) // interface { String() string }
-// cancel, err := eventbus.Subscribe(eventCh, event.ForceSubType(new(Event)))
-// [...]
-func ForceSubType(evtType interface{}) SubOption {
-	return func(settings interface{}) error {
-		s := settings.(*subSettings)
-		typ := reflect.TypeOf(evtType)
-		if typ.Kind() != reflect.Ptr {
-			return errors.New("ForceSubType called with non-pointer type")
-		}
-		s.forcedType = typ
-		return nil
-	}
-}
-
-type emitterSettings struct {
-	makeStateful bool
-}
-type EmitterOption func(interface{}) error
-
-// Stateful is an Emitter option which makes makes the eventbus channel
-// 'remember' last event sent, and when a new subscriber joins the
-// bus, the remembered event is immediately sent to the subscription
-// channel.
-//
-// This allows to provide state tracking for dynamic systems, and/or
-// allows new subscribers to verify that there are Emitters on the channel
-func Stateful(s *emitterSettings) {
-	s.makeStateful = true
-}
-
-// Bus is an interface to type-based event delivery system
-type Bus interface {
-	// Subscribe creates new subscription. Failing to drain the channel will cause
-	// publishers to get blocked. CancelFunc is guaranteed to return after last send
-	// to the channel
-	//
-	// Example:
-	// ch := make(chan EventT, 10)
-	// defer close(ch)
-	// cancel, err := eventbus.Subscribe(ch)
-	// defer cancel()
-	Subscribe(typedChan interface{}, opts ...SubOption) (CancelFunc, error)
-
-	// Emitter creates new emitter
-	//
-	// eventType accepts typed nil pointers, and uses the type information to
-	// select output type
-	//
-	// Example:
-	// emit, err := eventbus.Emitter(new(EventT))
-	// defer emit.Close() // MUST call this after being done with the emitter
-	//
-	// emit(EventT{})
-	Emitter(eventType interface{}, opts ...EmitterOption) (EmitFunc, error)
-}
-
-// EmitFunc emits events. If any channel subscribed to the topic is blocked,
-// calls to EmitFunc will block
-//
-// Calling this function with wrong event type will cause a panic
-type EmitFunc func(event interface{})
-
-func (f EmitFunc) Close() {
-	f(closeEmit)
-}
-
-type CancelFunc func()

opts.go

@@ -0,0 +1,56 @@
+package event
+
+import (
+	"errors"
+	"reflect"
+
+	"github.com/libp2p/go-libp2p-core/event"
+)
+
+type subSettings struct {
+	forcedType reflect.Type
+}
+
+// ForceSubType is a Subscribe option which overrides the type to which
+// the subscription will be done. Note that the evtType must be assignable
+// to channel type.
+//
+// This also allows for subscribing to multiple eventbus channels with one
+// Go channel to get better ordering guarantees.
+//
+// Example:
+// type Event struct{}
+// func (Event) String() string {
+//    return "event"
+// }
+//
+// eventCh := make(chan fmt.Stringer) // interface { String() string }
+// cancel, err := eventbus.Subscribe(eventCh, event.ForceSubType(new(Event)))
+// [...]
+func ForceSubType(evtType interface{}) event.SubscriptionOpt {
+	return func(settings interface{}) error {
+		s := settings.(*subSettings)
+		typ := reflect.TypeOf(evtType)
+		if typ.Kind() != reflect.Ptr {
+			return errors.New("ForceSubType called with non-pointer type")
+		}
+		s.forcedType = typ
+		return nil
+	}
+}
+
+type emitterSettings struct {
+	makeStateful bool
+}
+
+// Stateful is an Emitter option which makes makes the eventbus channel
+// 'remember' last event sent, and when a new subscriber joins the
+// bus, the remembered event is immediately sent to the subscription
+// channel.
+//
+// This allows to provide state tracking for dynamic systems, and/or
+// allows new subscribers to verify that there are Emitters on the channel
+func Stateful(s interface{}) error {
+	s.(*emitterSettings).makeStateful = true
+	return nil
+}