ratelimiter: fixing rate limiter use

blockservice/worker/worker.go

@@ -117,11 +117,10 @@ func (w *Worker) start(c Config) {
 		}
 	})
 
-	// reads from |workerChan| until process closes
-	w.process.Go(func(proc process.Process) {
+	// reads from |workerChan| until w.process closes
+	limiter := ratelimit.NewRateLimiter(w.process, c.NumWorkers)
+	limiter.Go(func(proc process.Process) {
 		ctx := waitable.Context(proc) // shut down in-progress HasBlock when time to die
-		limiter := ratelimit.NewRateLimiter(process.Background(), c.NumWorkers)
-		defer limiter.Close()
 		for {
 			select {
 			case <-proc.Closing():

p2p/net/swarm/swarm_dial.go

@@ -385,20 +385,23 @@ func (s *Swarm) dialAddrs(ctx context.Context, d *conn.Dialer, p peer.ID, remote
 	go func() {
 		// rate limiting just in case. at most 10 addrs at once.
 		limiter := ratelimit.NewRateLimiter(procctx.WithContext(ctx), 10)
-
-		// permute addrs so we try different sets first each time.
-		for _, i := range rand.Perm(len(remoteAddrs)) {
-			select {
-			case <-foundConn: // if one of them succeeded already
-				break
-			default:
+		limiter.Go(func(worker process.Process) {
+			// permute addrs so we try different sets first each time.
+			for _, i := range rand.Perm(len(remoteAddrs)) {
+				select {
+				case <-foundConn: // if one of them succeeded already
+					break
+				case <-worker.Closing(): // our context was cancelled
+					break
+				default:
+				}
+
+				workerAddr := remoteAddrs[i] // shadow variable to avoid race
+				limiter.LimitedGo(func(worker process.Process) {
+					dialSingleAddr(workerAddr)
+				})
 			}
-
-			workerAddr := remoteAddrs[i] // shadow variable to avoid race
-			limiter.Go(func(worker process.Process) {
-				dialSingleAddr(workerAddr)
-			})
-		}
+		})
 	}()
 
 	// wair fot the results.

thirdparty/notifier/notifier.go

@@ -120,18 +120,27 @@ func (n *Notifier) StopNotify(e Notifiee) {
 // hooks into your object that block you accidentally.
 func (n *Notifier) NotifyAll(notify func(Notifiee)) {
 	n.mu.Lock()
-	if n.nots != nil { // so that zero-value is ready to be used.
-		for notifiee := range n.nots {
+	defer n.mu.Unlock()
+
+	if n.nots == nil { // so that zero-value is ready to be used.
+		return
+	}
 
-			if n.lim == nil { // no rate limit
-				go notify(notifiee)
-			} else {
-				notifiee := notifiee // rebind for data races
-				n.lim.LimitedGo(func(worker process.Process) {
-					notify(notifiee)
-				})
-			}
+	// no rate limiting.
+	if n.lim == nil {
+		for notifiee := range n.nots {
+			go notify(notifiee)
 		}
+		return
 	}
-	n.mu.Unlock()
+
+	// with rate limiting.
+	n.lim.Go(func(worker process.Process) {
+		for notifiee := range n.nots {
+			notifiee := notifiee // rebind for loop data races
+			n.lim.LimitedGo(func(worker process.Process) {
+				notify(notifiee)
+			})
+		}
+	})
 }