Tweaks

federationsender/queue/destinationqueue.go

@@ -24,7 +24,7 @@ import (
 
 	"github.com/matrix-org/dendrite/federationsender/producers"
 	"github.com/matrix-org/gomatrixserverlib"
-	"github.com/matrix-org/util"
+	"github.com/sirupsen/logrus"
 	log "github.com/sirupsen/logrus"
 	"go.uber.org/atomic"
 )
@@ -51,6 +51,7 @@ type destinationQueue struct {
 	idleCounter        atomic.Uint32                        // how many ticks have we done nothing?
 	failCounter        atomic.Uint32                        // how many times have we failed?
 	sentCounter        atomic.Uint32                        // how many times have we succeeded?
+	wakeup             chan bool                            // wakes up a sleeping worker
 	runningMutex       sync.RWMutex                         // protects the below
 	lastTransactionIDs []gomatrixserverlib.TransactionID    // protected by runningMutex
 	pendingPDUs        []*gomatrixserverlib.HeaderedEvent   // protected by runningMutex
@@ -73,12 +74,14 @@ func (oq *destinationQueue) backoff() bool {
 		// backoff based on how many times we have failed already. The
 		// worker goroutine will wait until this time before processing
 		// anything from the queue.
-		backoffSeconds := math.Exp2(float64(failCounter))
+		backoffSeconds := time.Second * time.Duration(math.Exp2(float64(failCounter)))
 		oq.backoffUntil.Store(
-			time.Now().Add(time.Second * time.Duration(backoffSeconds)),
+			time.Now().Add(backoffSeconds),
 		)
+		logrus.WithField("server_name", oq.destination).Infof("Increasing backoff to %s", backoffSeconds)
 		return false // Don't give up yet.
 	} else {
+		logrus.WithField("server_name", oq.destination).Infof("Backlisting due to errors")
 		// We've exceeded the maximum amount of times we're willing
 		// to back off, which is probably in the region of hours by
 		// now. Just give up - clear the queues and reset the queue
@@ -112,10 +115,13 @@ func (oq *destinationQueue) sendEvent(ev *gomatrixserverlib.HeaderedEvent) {
 		return
 	}
 	oq.runningMutex.Lock()
-	oq.pendingPDUs = append(oq.pendingPDUs, ev)
+	evCopy := *ev
+	oq.pendingPDUs = append(oq.pendingPDUs, &evCopy)
 	oq.runningMutex.Unlock()
 	if !oq.running.Load() {
 		go oq.backgroundSend()
+	} else {
+		oq.wakeup <- true
 	}
 }
 
@@ -128,10 +134,13 @@ func (oq *destinationQueue) sendEDU(e *gomatrixserverlib.EDU) {
 		return
 	}
 	oq.runningMutex.Lock()
-	oq.pendingEDUs = append(oq.pendingEDUs, e)
+	eCopy := *e
+	oq.pendingEDUs = append(oq.pendingEDUs, &eCopy)
 	oq.runningMutex.Unlock()
 	if !oq.running.Load() {
 		go oq.backgroundSend()
+	} else {
+		oq.wakeup <- true
 	}
 }
 
@@ -144,18 +153,23 @@ func (oq *destinationQueue) sendInvite(ev *gomatrixserverlib.InviteV2Request) {
 		return
 	}
 	oq.runningMutex.Lock()
-	oq.pendingInvites = append(oq.pendingInvites, ev)
+	evCopy := *ev
+	oq.pendingInvites = append(oq.pendingInvites, &evCopy)
 	oq.runningMutex.Unlock()
 	if !oq.running.Load() {
 		go oq.backgroundSend()
+	} else {
+		oq.wakeup <- true
 	}
 }
 
 // backgroundSend is the worker goroutine for sending events.
 func (oq *destinationQueue) backgroundSend() {
 	// Mark the worker as running for its lifetime.
+	oq.wakeup = make(chan bool)
 	oq.running.Store(true)
 	defer oq.running.Store(false)
+	defer close(oq.wakeup)
 
 	for {
 		// Wait for our backoff timer.
@@ -163,6 +177,8 @@ func (oq *destinationQueue) backgroundSend() {
 		if b, ok := oq.backoffUntil.Load().(time.Time); ok {
 			backoffUntil = b
 		}
+
+		// If we have a backoff period then sit and wait for it.
 		if backoffUntil.After(time.Now()) {
 			<-time.After(time.Until(backoffUntil))
 		}
@@ -212,27 +228,24 @@ func (oq *destinationQueue) backgroundSend() {
 			// If we successfully sent the invites then clear out
 			// the pending invites.
 			if invites {
-				oq.success()
 				oq.runningMutex.Lock()
 				oq.pendingInvites = oq.pendingInvites[:0]
 				oq.runningMutex.Unlock()
 			}
 		}
 
-		// At this point, if we did everything successfully,
-		// we can reset the backoff duration.
-		if idleCounter >= 5 {
+		// Wait either for a few seconds, or until a new event is
+		// available.
+		select {
+		case <-oq.wakeup:
+		case <-time.After(time.Second * 5):
 			// If this worker has been idle for a while then stop
 			// running it, otherwise the goroutine will just tick
 			// endlessly. It'll get automatically restarted when
 			// a new event needs to be sent.
+			if idleCounter >= 5 {
 				return
-		} else {
-			// Otherwise, add to the ticker counter and ask the
-			// next iteration to wait for a second (to stop CPU
-			// spinning).
-			oq.idleCounter.Store(idleCounter + 1)
-			oq.backoffUntil.Store(time.Now().Add(time.Second))
+			}
 		}
 	}
 }
@@ -271,7 +284,7 @@ func (oq *destinationQueue) nextTransaction(
 		t.EDUs = append(t.EDUs, *edu)
 	}
 
-	util.GetLogger(context.TODO()).Infof("Sending transaction %q containing %d PDUs, %d EDUs", t.TransactionID, len(t.PDUs), len(t.EDUs))
+	logrus.WithField("server_name", oq.destination).Infof("Sending transaction %q containing %d PDUs, %d EDUs", t.TransactionID, len(t.PDUs), len(t.EDUs))
 
 	_, err := oq.client.SendTransaction(context.TODO(), t)
 	if err != nil {