From 6b6139f7ce06a3637a5403ae7b951d3dccbf6712 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ra=C3=BAl=20Kripalani?= Date: Wed, 20 May 2020 18:51:44 +0100 Subject: [PATCH] Support wildcard subscriptions + getter for known types (optimized) (#40) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Co-authored-by: Raúl Kripalani --- basic.go | 110 ++++++++++++++++++++++++++++++++++++++---- basic_test.go | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++ go.mod | 3 +- go.sum | 69 +++----------------------- 4 files changed, 241 insertions(+), 72 deletions(-) diff --git a/basic.go b/basic.go index 0e92883..7141532 100644 --- a/basic.go +++ b/basic.go @@ -15,14 +15,16 @@ import ( // basicBus is a type-based event delivery system type basicBus struct { - lk sync.Mutex - nodes map[reflect.Type]*node + lk sync.RWMutex + nodes map[reflect.Type]*node + wildcard *wildcardNode } var _ event.Bus = (*basicBus)(nil) type emitter struct { n *node + w *wildcardNode typ reflect.Type closed int32 dropper func(reflect.Type) @@ -33,6 +35,8 @@ func (e *emitter) Emit(evt interface{}) error { return fmt.Errorf("emitter is closed") } e.n.emit(evt) + e.w.emit(evt) + return nil } @@ -48,7 +52,8 @@ func (e *emitter) Close() error { func NewBus() event.Bus { return &basicBus{ - nodes: map[reflect.Type]*node{}, + nodes: map[reflect.Type]*node{}, + wildcard: new(wildcardNode), } } @@ -96,6 +101,20 @@ func (b *basicBus) tryDropNode(typ reflect.Type) { b.lk.Unlock() } +type wildcardSub struct { + ch chan interface{} + w *wildcardNode +} + +func (w *wildcardSub) Out() <-chan interface{} { + return w.ch +} + +func (w *wildcardSub) Close() error { + w.w.removeSink(w.ch) + return nil +} + type sub struct { ch chan interface{} nodes []*node @@ -143,18 +162,35 @@ var _ event.Subscription = (*sub)(nil) // publishers to get blocked. CancelFunc is guaranteed to return after last send // to the channel func (b *basicBus) Subscribe(evtTypes interface{}, opts ...event.SubscriptionOpt) (_ event.Subscription, err error) { - settings := subSettings(subSettingsDefault) + settings := subSettingsDefault for _, opt := range opts { if err := opt(&settings); err != nil { return nil, err } } + if evtTypes == event.WildcardSubscription { + out := &wildcardSub{ + ch: make(chan interface{}, settings.buffer), + w: b.wildcard, + } + b.wildcard.addSink(out.ch) + return out, nil + } + types, ok := evtTypes.([]interface{}) if !ok { types = []interface{}{evtTypes} } + if len(types) > 1 { + for _, t := range types { + if t == event.WildcardSubscription { + return nil, fmt.Errorf("wildcard subscriptions must be started separately") + } + } + } + out := &sub{ ch: make(chan interface{}, settings.buffer), nodes: make([]*node, len(types)), @@ -199,8 +235,11 @@ func (b *basicBus) Subscribe(evtTypes interface{}, opts ...event.SubscriptionOpt // // emit(EventT{}) func (b *basicBus) Emitter(evtType interface{}, opts ...event.EmitterOpt) (e event.Emitter, err error) { - var settings emitterSettings + if evtType == event.WildcardSubscription { + return nil, fmt.Errorf("illegal emitter for wildcard subscription") + } + var settings emitterSettings for _, opt := range opts { if err := opt(&settings); err != nil { return nil, err @@ -216,14 +255,65 @@ func (b *basicBus) Emitter(evtType interface{}, opts ...event.EmitterOpt) (e eve b.withNode(typ, func(n *node) { atomic.AddInt32(&n.nEmitters, 1) n.keepLast = n.keepLast || settings.makeStateful - e = &emitter{n: n, typ: typ, dropper: b.tryDropNode} + e = &emitter{n: n, typ: typ, dropper: b.tryDropNode, w: b.wildcard} }, nil) return } +// GetAllEventTypes returns all the event types that this bus has emitters +// or subscribers for. +func (b *basicBus) GetAllEventTypes() []reflect.Type { + b.lk.RLock() + defer b.lk.RUnlock() + + types := make([]reflect.Type, 0, len(b.nodes)) + for t, _ := range b.nodes { + types = append(types, t) + } + return types +} + /////////////////////// // NODE +type wildcardNode struct { + sync.RWMutex + nSinks int32 + sinks []chan interface{} +} + +func (n *wildcardNode) addSink(ch chan interface{}) { + atomic.AddInt32(&n.nSinks, 1) // ok to do outside the lock + n.Lock() + n.sinks = append(n.sinks, ch) + n.Unlock() +} + +func (n *wildcardNode) removeSink(ch chan interface{}) { + atomic.AddInt32(&n.nSinks, -1) // ok to do outside the lock + n.Lock() + for i := 0; i < len(n.sinks); i++ { + if n.sinks[i] == ch { + n.sinks[i], n.sinks[len(n.sinks)-1] = n.sinks[len(n.sinks)-1], nil + n.sinks = n.sinks[:len(n.sinks)-1] + break + } + } + n.Unlock() +} + +func (n *wildcardNode) emit(evt interface{}) { + if atomic.LoadInt32(&n.nSinks) == 0 { + return + } + + n.RLock() + for _, ch := range n.sinks { + ch <- evt + } + n.RUnlock() +} + type node struct { // Note: make sure to NEVER lock basicBus.lk when this lock is held lk sync.Mutex @@ -245,19 +335,19 @@ func newNode(typ reflect.Type) *node { } } -func (n *node) emit(event interface{}) { - typ := reflect.TypeOf(event) +func (n *node) emit(evt interface{}) { + typ := reflect.TypeOf(evt) if typ != n.typ { panic(fmt.Sprintf("Emit called with wrong type. expected: %s, got: %s", n.typ, typ)) } n.lk.Lock() if n.keepLast { - n.last = event + n.last = evt } for _, ch := range n.sinks { - ch <- event + ch <- evt } n.lk.Unlock() } diff --git a/basic_test.go b/basic_test.go index 8be3d83..172f3f2 100644 --- a/basic_test.go +++ b/basic_test.go @@ -1,13 +1,18 @@ package eventbus import ( + "context" "fmt" + "reflect" "sync" "sync/atomic" "testing" "time" + "github.com/libp2p/go-libp2p-core/event" "github.com/libp2p/go-libp2p-testing/race" + + "github.com/stretchr/testify/require" ) type EventA struct{} @@ -89,6 +94,30 @@ func TestSub(t *testing.T) { } } +func TestGetAllEventTypes(t *testing.T) { + bus := NewBus() + require.Empty(t, bus.GetAllEventTypes()) + + // the wildcard subscription should be returned. + _, err := bus.Subscribe(event.WildcardSubscription) + require.NoError(t, err) + + _, err = bus.Subscribe(new(EventB)) + require.NoError(t, err) + + evts := bus.GetAllEventTypes() + require.Len(t, evts, 1) + require.Equal(t, reflect.TypeOf((*EventB)(nil)).Elem(), evts[0]) + + _, err = bus.Emitter(new(EventA)) + require.NoError(t, err) + + evts = bus.GetAllEventTypes() + require.Len(t, evts, 2) + require.Contains(t, evts, reflect.TypeOf((*EventB)(nil)).Elem()) + require.Contains(t, evts, reflect.TypeOf((*EventA)(nil)).Elem()) +} + func TestEmitNoSubNoBlock(t *testing.T) { bus := NewBus() @@ -206,6 +235,108 @@ func TestSubMany(t *testing.T) { } } +func TestWildcardSubscription(t *testing.T) { + bus := NewBus() + sub, err := bus.Subscribe(event.WildcardSubscription) + require.NoError(t, err) + defer sub.Close() + + em1, err := bus.Emitter(new(EventA)) + require.NoError(t, err) + defer em1.Close() + + em2, err := bus.Emitter(new(EventB)) + require.NoError(t, err) + defer em2.Close() + + require.NoError(t, em1.Emit(EventA{})) + require.NoError(t, em2.Emit(EventB(1))) + + ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) + defer cancel() + var evts []interface{} + +LOOP: + for { + select { + case evt := <-sub.Out(): + if evta, ok := evt.(EventA); ok { + evts = append(evts, evta) + } + + if evtb, ok := evt.(EventB); ok { + evts = append(evts, evtb) + } + + if len(evts) == 2 { + break LOOP + } + + case <-ctx.Done(): + t.Fatalf("did not receive events") + } + } +} + +func TestManyWildcardSubscriptions(t *testing.T) { + bus := NewBus() + var subs []event.Subscription + for i := 0; i < 10; i++ { + sub, err := bus.Subscribe(event.WildcardSubscription) + require.NoError(t, err) + subs = append(subs, sub) + } + + em1, err := bus.Emitter(new(EventA)) + require.NoError(t, err) + defer em1.Close() + + em2, err := bus.Emitter(new(EventB)) + require.NoError(t, err) + defer em2.Close() + + require.NoError(t, em1.Emit(EventA{})) + require.NoError(t, em2.Emit(EventB(1))) + + // all 10 subscriptions received all 2 events. + for _, s := range subs { + require.Len(t, s.Out(), 2) + } + + // close the first five subscriptions. + for _, s := range subs[:5] { + require.NoError(t, s.Close()) + } + + // emit another 2 events. + require.NoError(t, em1.Emit(EventA{})) + require.NoError(t, em2.Emit(EventB(1))) + + // the first five still have 2 events, while the other five have 4 events. + for _, s := range subs[:5] { + require.Len(t, s.Out(), 2) + } + + for _, s := range subs[5:] { + require.Len(t, s.Out(), 4) + } + + // close them all, the first five will be closed twice (asserts idempotency). + for _, s := range subs { + require.NoError(t, s.Close()) + } +} + +func TestWildcardValidations(t *testing.T) { + bus := NewBus() + + _, err := bus.Subscribe([]interface{}{event.WildcardSubscription, new(EventA), new(EventB)}) + require.Error(t, err) + + _, err = bus.Emitter(event.WildcardSubscription) + require.Error(t, err) +} + func TestSubType(t *testing.T) { bus := NewBus() sub, err := bus.Subscribe([]interface{}{new(EventA), new(EventB)}) diff --git a/go.mod b/go.mod index d4e9ee5..7f658af 100644 --- a/go.mod +++ b/go.mod @@ -3,6 +3,7 @@ module github.com/libp2p/go-eventbus go 1.12 require ( - github.com/libp2p/go-libp2p-core v0.5.6 + github.com/libp2p/go-libp2p-core v0.5.7-0.20200520143746-39497bae12c5 github.com/libp2p/go-libp2p-testing v0.1.1 + github.com/stretchr/testify v1.4.0 ) diff --git a/go.sum b/go.sum index 47f5f7a..cade79b 100644 --- a/go.sum +++ b/go.sum @@ -1,15 +1,10 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII= -github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32/go.mod h1:DrZx5ec/dmnfpw9KyYoQyYo7d0KEvTkk/5M/vbZjAr8= -github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c h1:aEbSeNALREWXk0G7UdNhR3ayBV7tZ4M2PNmnrCAph6Q= github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI= -github.com/btcsuite/btcd v0.0.0-20190824003749-130ea5bddde3 h1:A/EVblehb75cUgXA5njHPn0kLAsykn6mJGz7rnmW5W0= -github.com/btcsuite/btcd v0.0.0-20190824003749-130ea5bddde3/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI= github.com/btcsuite/btcd v0.20.1-beta h1:Ik4hyJqN8Jfyv3S4AGBOmyouMsYE3EdYODkMbQjwPGw= github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ= github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA= -github.com/btcsuite/btcutil v0.0.0-20190207003914-4c204d697803/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg= github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg= github.com/btcsuite/go-socks v0.0.0-20170105172521-4720035b7bfd/go.mod h1:HHNXQzUsZCxOoE+CPiyCTO6x34Zs86zZUiwtpXoGdtg= github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVaaLLH7j4eDXPRvw78tMflu7Ie2bzYOH4Y8rRKBY= @@ -18,13 +13,11 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtE github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs= github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk= -github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495 h1:6IyqGr3fnd0tM3YxipK27TUskaOVUjU2nG45yzwcQKY= github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= -github.com/gogo/protobuf v1.2.1 h1:/s5zKNz0uPFCZ5hddgPdo2TK2TVrUNMn0OOX8/aZMTE= github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4= github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls= github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o= @@ -39,15 +32,10 @@ github.com/gxed/hashland/keccakpg v0.0.1/go.mod h1:kRzw3HkwxFU1mpmPP8v1WyQzwdGfm github.com/gxed/hashland/murmur3 v0.0.1/go.mod h1:KjXop02n4/ckmZSnY2+HKcLud/tcmvhST0bie/0lS48= github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8= github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU= -github.com/ipfs/go-cid v0.0.1/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM= github.com/ipfs/go-cid 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v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU= @@ -197,7 +144,6 @@ golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5h golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 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/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb h1:fgwFCsaw9buMuxNd6+DQfAuSFqbNiQZpcgJQAgJsK6k= @@ -210,7 +156,6 @@ golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGm golang.org/x/tools v0.0.0-20181130052023-1c3d964395ce/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY= -golang.org/x/tools v0.0.0-20190311212946-11955173bddd h1:/e+gpKk9r3dJobndpTytxS2gOy6m5uvpg+ISQoEcusQ= golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs= google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM= google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= @@ -220,11 +165,13 @@ 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