Post request.completed only after envelopes from that request were added to a filter (#27)

* Post completion event after every message was added to a filter

* Add test that request.completed received after all envelope.avaiable

* Process all p2p envelopes and completion events sequantially

* Stop whisper after test

whisperv6/whisper.go

@@ -91,7 +91,7 @@ type Whisper struct {
 	peers  map[*Peer]struct{} // Set of currently active peers
 
 	messageQueue chan *Envelope   // Message queue for normal whisper messages
-	p2pMsgQueue  chan *Envelope // Message queue for peer-to-peer messages (not to be forwarded any further)
+	p2pMsgQueue  chan interface{} // Message queue for peer-to-peer messages (not to be forwarded any further) and history delivery confirmations.
 	quit         chan struct{}    // Channel used for graceful exit
 
 	settings syncmap.Map // holds configuration settings that can be dynamically changed
@@ -125,7 +125,7 @@ func New(cfg *Config) *Whisper {
 		expirations:          make(map[uint32]mapset.Set),
 		peers:                make(map[*Peer]struct{}),
 		messageQueue:         make(chan *Envelope, messageQueueLimit),
-		p2pMsgQueue:          make(chan *Envelope, messageQueueLimit),
+		p2pMsgQueue:          make(chan interface{}, messageQueueLimit),
 		quit:                 make(chan struct{}),
 		syncAllowance:        DefaultSyncAllowance,
 		timeSource:           time.Now,
@@ -815,6 +815,7 @@ func (whisper *Whisper) Start(*p2p.Server) error {
 	for i := 0; i < numCPU; i++ {
 		go whisper.processQueue()
 	}
+	go whisper.processP2P()
 
 	return nil
 }
@@ -1005,7 +1006,7 @@ func (whisper *Whisper) runMessageLoop(p *Peer, rw p2p.MsgReadWriter) error {
 
 				if err = packet.Decode(&envelopes); err == nil {
 					for _, envelope := range envelopes {
-						whisper.postEvent(envelope, true)
+						whisper.postP2P(envelope)
 					}
 					continue
 				}
@@ -1019,7 +1020,7 @@ func (whisper *Whisper) runMessageLoop(p *Peer, rw p2p.MsgReadWriter) error {
 				}
 
 				if err = packet.Decode(&envelope); err == nil {
-					whisper.postEvent(envelope, true)
+					whisper.postP2P(envelope)
 					continue
 				}
 
@@ -1103,7 +1104,7 @@ func (whisper *Whisper) runMessageLoop(p *Peer, rw p2p.MsgReadWriter) error {
 				}
 
 				if event != nil {
-					whisper.envelopeFeed.Send(*event)
+					whisper.postP2P(*event)
 				}
 
 			}
@@ -1208,14 +1209,19 @@ func (whisper *Whisper) add(envelope *Envelope, isP2P bool) (bool, error) {
 	return true, nil
 }
 
+func (whisper *Whisper) postP2P(event interface{}) {
+	whisper.p2pMsgQueue <- event
+}
+
 // postEvent queues the message for further processing.
 func (whisper *Whisper) postEvent(envelope *Envelope, isP2P bool) {
 	if isP2P {
-		whisper.p2pMsgQueue <- envelope
+		whisper.postP2P(envelope)
 	} else {
 		whisper.checkOverflow()
 		whisper.messageQueue <- envelope
 	}
+
 }
 
 // checkOverflow checks if message queue overflow occurs and reports it if necessary.
@@ -1237,25 +1243,36 @@ func (whisper *Whisper) checkOverflow() {
 
 // processQueue delivers the messages to the watchers during the lifetime of the whisper node.
 func (whisper *Whisper) processQueue() {
-	var e *Envelope
 	for {
 		select {
 		case <-whisper.quit:
 			return
-
-		case e = <-whisper.messageQueue:
+		case e := <-whisper.messageQueue:
 			whisper.filters.NotifyWatchers(e, false)
 			whisper.envelopeFeed.Send(EnvelopeEvent{
 				Hash:  e.Hash(),
 				Event: EventEnvelopeAvailable,
 			})
+		}
+	}
+}
 
-		case e = <-whisper.p2pMsgQueue:
-			whisper.filters.NotifyWatchers(e, true)
+func (whisper *Whisper) processP2P() {
+	for {
+		select {
+		case <-whisper.quit:
+			return
+		case e := <-whisper.p2pMsgQueue:
+			switch event := e.(type) {
+			case *Envelope:
+				whisper.filters.NotifyWatchers(event, true)
 				whisper.envelopeFeed.Send(EnvelopeEvent{
-				Hash:  e.Hash(),
+					Hash:  event.Hash(),
 					Event: EventEnvelopeAvailable,
 				})
+			case EnvelopeEvent:
+				whisper.envelopeFeed.Send(event)
+			}
 		}
 	}
 }

whisperv6/whisper_test.go

@@ -1527,3 +1527,44 @@ func (m *mockMailServer) SyncMail(p *Peer, r SyncMailRequest) error {
 	args := m.Called(p, r)
 	return args.Error(0)
 }
+
+func TestMailserverCompletionEvent(t *testing.T) {
+	w := New(nil)
+	require.NoError(t, w.Start(nil))
+	defer w.Stop()
+
+	rw1, rw2 := p2p.MsgPipe()
+	peer := newPeer(w, p2p.NewPeer(enode.ID{1}, "1", nil), rw1)
+	peer.trusted = true
+	w.peers[peer] = struct{}{}
+
+	events := make(chan EnvelopeEvent)
+	sub := w.SubscribeEnvelopeEvents(events)
+	defer sub.Unsubscribe()
+
+	envelopes := []*Envelope{{Data: []byte{1}}, {Data: []byte{2}}}
+	go func() {
+		require.NoError(t, p2p.Send(rw2, p2pMessageCode, envelopes))
+		require.NoError(t, p2p.Send(rw2, p2pRequestCompleteCode, [100]byte{})) // 2 hashes + cursor size
+		rw2.Close()
+	}()
+	require.EqualError(t, w.runMessageLoop(peer, rw1), "p2p: read or write on closed message pipe")
+
+	after := time.After(2 * time.Second)
+	count := 0
+	for {
+		select {
+		case <-after:
+			require.FailNow(t, "timed out waiting for all events")
+		case ev := <-events:
+			switch ev.Event {
+			case EventEnvelopeAvailable:
+				count++
+			case EventMailServerRequestCompleted:
+				require.Equal(t, count, len(envelopes),
+					"all envelope.avaiable events mut be recevied before request is compelted")
+				return
+			}
+		}
+	}
+}