Add Req/Res count/time to candidate stats (#763)

These details will provide information for
connectivity issue.

agent.go

@@ -980,18 +980,23 @@ func (a *Agent) findRemoteCandidate(networkType NetworkType, addr net.Addr) Cand
 	return nil
 }
 
-func (a *Agent) sendBindingRequest(m *stun.Message, local, remote Candidate) {
+func (a *Agent) sendBindingRequest(msg *stun.Message, local, remote Candidate) {
 	a.log.Tracef("Ping STUN from %s to %s", local, remote)
 
 	a.invalidatePendingBindingRequests(time.Now())
 	a.pendingBindingRequests = append(a.pendingBindingRequests, bindingRequest{
 		timestamp:      time.Now(),
-		transactionID:  m.TransactionID,
+		transactionID:  msg.TransactionID,
 		destination:    remote.addr(),
-		isUseCandidate: m.Contains(stun.AttrUseCandidate),
+		isUseCandidate: msg.Contains(stun.AttrUseCandidate),
 	})
 
-	a.sendSTUN(m, local, remote)
+	if pair := a.findPair(local, remote); pair != nil {
+		pair.UpdateRequestSent()
+	} else {
+		a.log.Warnf("Failed to find pair for add binding request from %s to %s", local, remote)
+	}
+	a.sendSTUN(msg, local, remote)
 }
 
 func (a *Agent) sendBindingSuccess(m *stun.Message, local, remote Candidate) {
@@ -1014,6 +1019,11 @@ func (a *Agent) sendBindingSuccess(m *stun.Message, local, remote Candidate) {
 	); err != nil {
 		a.log.Warnf("Failed to handle inbound ICE from: %s to: %s error: %s", local, remote, err)
 	} else {
+		if pair := a.findPair(local, remote); pair != nil {
+			pair.UpdateResponseSent()
+		} else {
+			a.log.Warnf("Failed to find pair for add binding response from %s to %s", local, remote)
+		}
 		a.sendSTUN(out, local, remote)
 	}
 }

agent_stats.go

@@ -26,18 +26,22 @@ func (a *Agent) GetCandidatePairsStats() []CandidatePairStats {
 				// BytesReceived uint64
 				// LastPacketSentTimestamp time.Time
 				// LastPacketReceivedTimestamp time.Time
-				// FirstRequestTimestamp time.Time
-				// LastRequestTimestamp time.Time
-				// LastResponseTimestamp time.Time
+				FirstRequestTimestamp:         cp.FirstRequestSentAt(),
+				LastRequestTimestamp:          cp.LastRequestSentAt(),
+				FirstResponseTimestamp:        cp.FirstReponseReceivedAt(),
+				LastResponseTimestamp:         cp.LastResponseReceivedAt(),
+				FirstRequestReceivedTimestamp: cp.FirstRequestReceivedAt(),
+				LastRequestReceivedTimestamp:  cp.LastRequestReceivedAt(),
+
 				TotalRoundTripTime:   cp.TotalRoundTripTime(),
 				CurrentRoundTripTime: cp.CurrentRoundTripTime(),
 				// AvailableOutgoingBitrate float64
 				// AvailableIncomingBitrate float64
 				// CircuitBreakerTriggerCount uint32
-				// RequestsReceived uint64
-				// RequestsSent uint64
+				RequestsReceived:  cp.RequestsReceived(),
+				RequestsSent:      cp.RequestsSent(),
 				ResponsesReceived: cp.ResponsesReceived(),
-				// ResponsesSent uint64
+				ResponsesSent:     cp.ResponsesSent(),
 				// RetransmissionsReceived uint64
 				// RetransmissionsSent uint64
 				// ConsentRequestsSent uint64

agent_test.go

@@ -636,7 +636,7 @@ func TestInvalidGather(t *testing.T) {
 	})
 }
 
-func TestCandidatePairsStats(t *testing.T) { //nolint:cyclop
+func TestCandidatePairsStats(t *testing.T) { //nolint:cyclop,gocyclo
 	defer test.CheckRoutines(t)()
 
 	// Avoid deadlocks?
@@ -715,14 +715,18 @@ func TestCandidatePairsStats(t *testing.T) { //nolint:cyclop
 		p := agent.findPair(hostLocal, remote)
 
 		if p == nil {
-			agent.addPair(hostLocal, remote)
+			p = agent.addPair(hostLocal, remote)
 		}
+		p.UpdateRequestReceived()
+		p.UpdateRequestSent()
+		p.UpdateResponseSent()
+		p.UpdateRoundTripTime(time.Second)
 	}
 
 	p := agent.findPair(hostLocal, prflxRemote)
 	p.state = CandidatePairStateFailed
 
-	for i := 0; i < 10; i++ {
+	for i := 1; i < 10; i++ {
 		p.UpdateRoundTripTime(time.Duration(i+1) * time.Second)
 	}
 
@@ -749,6 +753,13 @@ func TestCandidatePairsStats(t *testing.T) { //nolint:cyclop
 		default:
 			t.Fatal("invalid remote candidate ID")
 		}
+
+		if cps.FirstRequestTimestamp.IsZero() || cps.LastRequestTimestamp.IsZero() ||
+			cps.FirstResponseTimestamp.IsZero() || cps.LastResponseTimestamp.IsZero() ||
+			cps.FirstRequestReceivedTimestamp.IsZero() || cps.LastRequestReceivedTimestamp.IsZero() ||
+			cps.RequestsReceived == 0 || cps.RequestsSent == 0 || cps.ResponsesSent == 0 || cps.ResponsesReceived == 0 {
+			t.Fatal("failed to verify pair stats counter and timestamps", cps)
+		}
 	}
 
 	if relayPairStat.RemoteCandidateID != relayRemote.ID() {

candidatepair.go

@@ -33,7 +33,18 @@ type CandidatePair struct {
 	// stats
 	currentRoundTripTime int64 // in ns
 	totalRoundTripTime   int64 // in ns
-	responsesReceived    uint64
+
+	requestsReceived  uint64
+	requestsSent      uint64
+	responsesReceived uint64
+	responsesSent     uint64
+
+	firstRequestSentAt     atomic.Value // time.Time
+	lastRequestSentAt      atomic.Value // time.Time
+	firstReponseReceivedAt atomic.Value // time.Time
+	lastResponseReceivedAt atomic.Value // time.Time
+	firstRequestReceivedAt atomic.Value // time.Time
+	lastRequestReceivedAt  atomic.Value // time.Time
 }
 
 func (p *CandidatePair) String() string {
@@ -127,6 +138,10 @@ func (p *CandidatePair) UpdateRoundTripTime(rtt time.Duration) {
 	atomic.StoreInt64(&p.currentRoundTripTime, rttNs)
 	atomic.AddInt64(&p.totalRoundTripTime, rttNs)
 	atomic.AddUint64(&p.responsesReceived, 1)
+
+	now := time.Now()
+	p.firstReponseReceivedAt.CompareAndSwap(nil, now)
+	p.lastResponseReceivedAt.Store(now)
 }
 
 // CurrentRoundTripTime returns the current round trip time in seconds
@@ -141,8 +156,101 @@ func (p *CandidatePair) TotalRoundTripTime() float64 {
 	return time.Duration(atomic.LoadInt64(&p.totalRoundTripTime)).Seconds()
 }
 
+// RequestsReceived returns the total number of connectivity checks received
+// https://www.w3.org/TR/webrtc-stats/#dom-rtcicecandidatepairstats-requestsreceived
+func (p *CandidatePair) RequestsReceived() uint64 {
+	return atomic.LoadUint64(&p.requestsReceived)
+}
+
+// RequestsSent returns the total number of connectivity checks sent
+// https://www.w3.org/TR/webrtc-stats/#dom-rtcicecandidatepairstats-requestssent
+func (p *CandidatePair) RequestsSent() uint64 {
+	return atomic.LoadUint64(&p.requestsSent)
+}
+
 // ResponsesReceived returns the total number of connectivity responses received
 // https://www.w3.org/TR/webrtc-stats/#dom-rtcicecandidatepairstats-responsesreceived
 func (p *CandidatePair) ResponsesReceived() uint64 {
 	return atomic.LoadUint64(&p.responsesReceived)
 }
+
+// ResponsesSent returns the total number of connectivity responses sent
+// https://www.w3.org/TR/webrtc-stats/#dom-rtcicecandidatepairstats-responsessent
+func (p *CandidatePair) ResponsesSent() uint64 {
+	return atomic.LoadUint64(&p.responsesSent)
+}
+
+// FirstRequestSentAt returns the timestamp of the first connectivity check sent.
+func (p *CandidatePair) FirstRequestSentAt() time.Time {
+	if v, ok := p.firstRequestSentAt.Load().(time.Time); ok {
+		return v
+	}
+
+	return time.Time{}
+}
+
+// LastRequestSentAt returns the timestamp of the last connectivity check sent.
+func (p *CandidatePair) LastRequestSentAt() time.Time {
+	if v, ok := p.lastRequestSentAt.Load().(time.Time); ok {
+		return v
+	}
+
+	return time.Time{}
+}
+
+// FirstReponseReceivedAt returns the timestamp of the first connectivity response received.
+func (p *CandidatePair) FirstReponseReceivedAt() time.Time {
+	if v, ok := p.firstReponseReceivedAt.Load().(time.Time); ok {
+		return v
+	}
+
+	return time.Time{}
+}
+
+// LastResponseReceivedAt returns the timestamp of the last connectivity response received.
+func (p *CandidatePair) LastResponseReceivedAt() time.Time {
+	if v, ok := p.lastResponseReceivedAt.Load().(time.Time); ok {
+		return v
+	}
+
+	return time.Time{}
+}
+
+// FirstRequestReceivedAt returns the timestamp of the first connectivity check received.
+func (p *CandidatePair) FirstRequestReceivedAt() time.Time {
+	if v, ok := p.firstRequestReceivedAt.Load().(time.Time); ok {
+		return v
+	}
+
+	return time.Time{}
+}
+
+// LastRequestReceivedAt returns the timestamp of the last connectivity check received.
+func (p *CandidatePair) LastRequestReceivedAt() time.Time {
+	if v, ok := p.lastRequestReceivedAt.Load().(time.Time); ok {
+		return v
+	}
+
+	return time.Time{}
+}
+
+// UpdateRequestSent increments the number of requests sent and updates the timestamp.
+func (p *CandidatePair) UpdateRequestSent() {
+	atomic.AddUint64(&p.requestsSent, 1)
+	now := time.Now()
+	p.firstRequestSentAt.CompareAndSwap(nil, now)
+	p.lastRequestSentAt.Store(now)
+}
+
+// UpdateResponseSent increments the number of responses sent.
+func (p *CandidatePair) UpdateResponseSent() {
+	atomic.AddUint64(&p.responsesSent, 1)
+}
+
+// UpdateRequestReceived increments the number of requests received and updates the timestamp.
+func (p *CandidatePair) UpdateRequestReceived() {
+	atomic.AddUint64(&p.requestsReceived, 1)
+	now := time.Now()
+	p.firstRequestReceivedAt.CompareAndSwap(nil, now)
+	p.lastRequestReceivedAt.Store(now)
+}

selection.go

@@ -100,10 +100,12 @@ func (s *controllingSelector) HandleBindingRequest(message *stun.Message, local,
 	pair := s.agent.findPair(local, remote)
 
 	if pair == nil {
-		s.agent.addPair(local, remote)
+		pair = s.agent.addPair(local, remote)
+		pair.UpdateRequestReceived()
 
 		return
 	}
+	pair.UpdateRequestReceived()
 
 	if pair.state == CandidatePairStateSucceeded && s.nominatedPair == nil && s.agent.getSelectedPair() == nil {
 		bestPair := s.agent.getBestAvailableCandidatePair()
@@ -281,6 +283,7 @@ func (s *controlledSelector) HandleBindingRequest(message *stun.Message, local,
 	if pair == nil {
 		pair = s.agent.addPair(local, remote)
 	}
+	pair.UpdateRequestReceived()
 
 	if message.Contains(stun.AttrUseCandidate) { //nolint:nestif
 		// https://tools.ietf.org/html/rfc8445#section-7.3.1.5

stats.go

@@ -58,10 +58,22 @@ type CandidatePairStats struct {
 	// (LastRequestTimestamp - FirstRequestTimestamp) / RequestsSent.
 	LastRequestTimestamp time.Time
 
+	// FirstResponseTimestamp represents the timestamp at which the first STUN response
+	// was received on this particular candidate pair.
+	FirstResponseTimestamp time.Time
+
 	// LastResponseTimestamp represents the timestamp at which the last STUN response
 	// was received on this particular candidate pair.
 	LastResponseTimestamp time.Time
 
+	// FirstRequestReceivedTimestamp represents the timestamp at which the first
+	// connectivity check request was received.
+	FirstRequestReceivedTimestamp time.Time
+
+	// LastRequestReceivedTimestamp represents the timestamp at which the last
+	// connectivity check request was received.
+	LastRequestReceivedTimestamp time.Time
+
 	// TotalRoundTripTime represents the sum of all round trip time measurements
 	// in seconds since the beginning of the session, based on STUN connectivity
 	// check responses (ResponsesReceived), including those that reply to requests