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refactor(hooks): use external pubsub (#65)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,53 +1,40 @@ | ||
| package hooks | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| "github.com/hannahhoward/go-pubsub" | ||
| "github.com/ipfs/go-graphsync" | ||
| peer "github.com/libp2p/go-libp2p-core/peer" | ||
| ) | ||
|
|
||
| type completedListener struct { | ||
| key uint64 | ||
| listener graphsync.OnResponseCompletedListener | ||
| } | ||
|
|
||
| // CompletedResponseListeners is a set of listeners for completed responses | ||
| type CompletedResponseListeners struct { | ||
| listenersLk sync.RWMutex | ||
| nextKey uint64 | ||
| listeners []completedListener | ||
| pubSub *pubsub.PubSub | ||
| } | ||
|
|
||
| type internalCompletedResponseEvent struct { | ||
| p peer.ID | ||
| request graphsync.RequestData | ||
| status graphsync.ResponseStatusCode | ||
| } | ||
|
|
||
| func completedResponseDispatcher(event pubsub.Event, subscriberFn pubsub.SubscriberFn) error { | ||
| ie := event.(internalCompletedResponseEvent) | ||
| listener := subscriberFn.(graphsync.OnResponseCompletedListener) | ||
| listener(ie.p, ie.request, ie.status) | ||
| return nil | ||
| } | ||
|
|
||
| // NewCompletedResponseListeners returns a new list of completed response listeners | ||
| func NewCompletedResponseListeners() *CompletedResponseListeners { | ||
| return &CompletedResponseListeners{} | ||
| return &CompletedResponseListeners{pubSub: pubsub.New(completedResponseDispatcher)} | ||
| } | ||
|
|
||
| // Register registers an listener for completed responses | ||
| func (crl *CompletedResponseListeners) Register(listener graphsync.OnResponseCompletedListener) graphsync.UnregisterHookFunc { | ||
| crl.listenersLk.Lock() | ||
| cl := completedListener{crl.nextKey, listener} | ||
| crl.nextKey++ | ||
| crl.listeners = append(crl.listeners, cl) | ||
| crl.listenersLk.Unlock() | ||
| return func() { | ||
| crl.listenersLk.Lock() | ||
| defer crl.listenersLk.Unlock() | ||
| for i, matchListener := range crl.listeners { | ||
| if cl.key == matchListener.key { | ||
| crl.listeners = append(crl.listeners[:i], crl.listeners[i+1:]...) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| return graphsync.UnregisterHookFunc(crl.pubSub.Subscribe(listener)) | ||
| } | ||
|
|
||
| // NotifyCompletedListeners runs notifies all completed listeners that a response has completed | ||
| func (crl *CompletedResponseListeners) NotifyCompletedListeners(p peer.ID, request graphsync.RequestData, status graphsync.ResponseStatusCode) { | ||
| crl.listenersLk.RLock() | ||
| defer crl.listenersLk.RUnlock() | ||
| for _, listener := range crl.listeners { | ||
| listener.listener(p, request, status) | ||
| } | ||
| _ = crl.pubSub.Publish(internalCompletedResponseEvent{p, request, status}) | ||
| } |
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