Reconnection Improvements, Channel Metrics, and Random Seed Support (#21)

* Dynamic Reconnect and Multi-Channel Support

* updating go-release-action to the latest

* Reconnection improvements and extra metrics

Author: filipecosta90

subscriber.go

@@ -30,6 +30,8 @@ const (
 )
 
 var totalMessages uint64
+var totalSubscribedChannels int64
+var totalConnects uint64
 var clusterSlicesMu sync.Mutex
 
 type testResult struct {
@@ -48,41 +50,58 @@ type testResult struct {
 	Addresses             []string  `json:"Addresses"`
 }
 
-func subscriberRoutine(mode string, channels []string, printMessages bool, connectionReconnectInterval int, ctx context.Context, wg *sync.WaitGroup, client *redis.Client) {
+func subscriberRoutine(clientName, mode string, channels []string, printMessages bool, connectionReconnectInterval int, ctx context.Context, wg *sync.WaitGroup, client *redis.Client) {
 	// Tell the caller we've stopped
 	defer wg.Done()
 	var reconnectTicker *time.Ticker
 	if connectionReconnectInterval > 0 {
-		reconnectTicker = time.NewTicker(time.Duration(connectionReconnectInterval) * time.Second)
+		reconnectTicker = time.NewTicker(time.Duration(connectionReconnectInterval) * time.Millisecond)
 		defer reconnectTicker.Stop()
 	} else {
 		reconnectTicker = time.NewTicker(1 * time.Second)
 		reconnectTicker.Stop()
 	}
 
 	var pubsub *redis.PubSub
+	nChannels := len(channels)
 
 	// Helper function to handle subscription based on mode
 	subscribe := func() {
 		if pubsub != nil {
-			// Unsubscribe based on mode before re-subscribing
-			if mode == "ssubscribe" {
-				if err := pubsub.SUnsubscribe(ctx, channels...); err != nil {
-					fmt.Printf("Error during SUnsubscribe: %v\n", err)
+			if nChannels > 1 {
+				// Unsubscribe based on mode before re-subscribing
+				if mode == "ssubscribe" {
+					if err := pubsub.SUnsubscribe(ctx, channels[1:]...); err != nil {
+						fmt.Printf("Error during SUnsubscribe: %v\n", err)
+					}
+					pubsub.Close()
+					atomic.AddInt64(&totalSubscribedChannels, int64(-len(channels[1:])))
+					pubsub = client.SSubscribe(ctx, channels[1:]...)
+					atomic.AddInt64(&totalSubscribedChannels, int64(len(channels[1:])))
+				} else {
+					if err := pubsub.Unsubscribe(ctx, channels[1:]...); err != nil {
+						fmt.Printf("Error during Unsubscribe: %v\n", err)
+						pubsub.Close()
+						atomic.AddInt64(&totalSubscribedChannels, int64(-len(channels[1:])))
+						pubsub = client.Subscribe(ctx, channels[1:]...)
+						atomic.AddInt64(&totalSubscribedChannels, int64(len(channels[1:])))
+					}
 				}
+				atomic.AddUint64(&totalConnects, 1)
 			} else {
-				if err := pubsub.Unsubscribe(ctx, channels...); err != nil {
-					fmt.Printf("Error during Unsubscribe: %v\n", err)
-				}
+				log.Println(fmt.Sprintf("Skipping (S)UNSUBSCRIBE given client %s had only one channel subscribed in this connection: %v.", clientName, channels))
 			}
-			pubsub.Close()
-		}
-		switch mode {
-		case "ssubscribe":
-			pubsub = client.SSubscribe(ctx, channels...)
-		default:
-			pubsub = client.Subscribe(ctx, channels...)
+		} else {
+			switch mode {
+			case "ssubscribe":
+				pubsub = client.SSubscribe(ctx, channels...)
+			default:
+				pubsub = client.Subscribe(ctx, channels...)
+			}
+			atomic.AddInt64(&totalSubscribedChannels, int64(len(channels)))
+			atomic.AddUint64(&totalConnects, 1)
 		}
+
 	}
 
 	subscribe()
@@ -142,6 +161,7 @@ func main() {
 	json_out_file := flag.String("json-out-file", "", "Name of json output file, if not set, will not print to json.")
 	client_update_tick := flag.Int("client-update-tick", 1, "client update tick.")
 	test_time := flag.Int("test-time", 0, "Number of seconds to run the test, after receiving the first message.")
+	randSeed := flag.Int64("rand-seed", 12345, "Random deterministic seed.")
 	subscribe_prefix := flag.String("subscriber-prefix", "channel-", "prefix for subscribing to channel, used in conjunction with key-minimum and key-maximum.")
 	client_output_buffer_limit_pubsub := flag.String("client-output-buffer-limit-pubsub", "", "Specify client output buffer limits for clients subscribed to at least one pubsub channel or pattern. If the value specified is different that the one present on the DB, this setting will apply.")
 	distributeSubscribers := flag.Bool("oss-cluster-api-distribute-subscribers", false, "read cluster slots and distribute subscribers among them.")
@@ -167,6 +187,8 @@ func main() {
 		log.Fatal(fmt.Errorf("--messages and --test-time are mutially exclusive ( please specify one or the other )"))
 	}
 	log.Println(fmt.Sprintf("pubsub-sub-bench (git_sha1:%s%s)", git_sha, git_dirty_str))
+	log.Println(fmt.Sprintf("using random seed:%d", *randSeed))
+	rand.Seed(*randSeed)
 
 	ctx := context.Background()
 	nodeCount := 0
@@ -292,7 +314,7 @@ func main() {
 				if *max_channels_per_subscriber == *min_channels_per_subscriber {
 					n_channels_this_conn = *max_channels_per_subscriber
 				} else {
-					n_channels_this_conn = rand.Intn(*max_channels_per_subscriber - *min_channels_per_subscriber)
+					n_channels_this_conn = rand.Intn(*max_channels_per_subscriber-*min_channels_per_subscriber) + *min_channels_per_subscriber
 				}
 				for channel_this_conn := 1; channel_this_conn < n_channels_this_conn; channel_this_conn++ {
 					new_channel_id := rand.Intn(*channel_maximum) + *channel_minimum
@@ -330,12 +352,13 @@ func main() {
 				if *max_reconnect_interval == *min_reconnect_interval {
 					connectionReconnectInterval = *max_reconnect_interval
 				} else {
-					connectionReconnectInterval = rand.Intn(*max_reconnect_interval-*min_reconnect_interval) + *max_reconnect_interval
+					connectionReconnectInterval = rand.Intn(*max_reconnect_interval-*min_reconnect_interval) + *min_reconnect_interval
 				}
 				if connectionReconnectInterval > 0 {
-					log.Println(fmt.Sprintf("Using reconnection interval of %d for subscriber: %s", connectionReconnectInterval, subscriberName))
+					log.Println(fmt.Sprintf("Using reconnection interval of %d milliseconds for subscriber: %s", connectionReconnectInterval, subscriberName))
 				}
-				go subscriberRoutine(*mode, channels, *printMessages, connectionReconnectInterval, ctx, &wg, client)
+				log.Println(fmt.Sprintf("subscriber: %s. Total channels %d: %v", subscriberName, len(channels), channels))
+				go subscriberRoutine(subscriberName, *mode, channels, *printMessages, connectionReconnectInterval, ctx, &wg, client)
 			}
 		}
 	}
@@ -431,10 +454,11 @@ func updateCLI(tick *time.Ticker, c chan os.Signal, message_limit int64, w *tabw
 	start := time.Now()
 	prevTime := time.Now()
 	prevMessageCount := uint64(0)
+	prevConnectCount := uint64(0)
 	messageRateTs := []float64{}
 
 	w.Init(os.Stdout, 25, 0, 1, ' ', tabwriter.AlignRight)
-	fmt.Fprint(w, fmt.Sprintf("Test Time\tTotal Messages\t Message Rate \t"))
+	fmt.Fprint(w, fmt.Sprintf("Test Time\tTotal Messages\t Message Rate \tConnect Rate \tActive subscriptions\t"))
 	fmt.Fprint(w, "\n")
 	w.Flush()
 	for {
@@ -444,16 +468,19 @@ func updateCLI(tick *time.Ticker, c chan os.Signal, message_limit int64, w *tabw
 				now := time.Now()
 				took := now.Sub(prevTime)
 				messageRate := float64(totalMessages-prevMessageCount) / float64(took.Seconds())
+				connectRate := float64(totalConnects-prevConnectCount) / float64(took.Seconds())
+
 				if prevMessageCount == 0 && totalMessages != 0 {
 					start = time.Now()
 				}
 				if totalMessages != 0 {
 					messageRateTs = append(messageRateTs, messageRate)
 				}
 				prevMessageCount = totalMessages
+				prevConnectCount = totalConnects
 				prevTime = now
 
-				fmt.Fprint(w, fmt.Sprintf("%.0f\t%d\t%.2f\t", time.Since(start).Seconds(), totalMessages, messageRate))
+				fmt.Fprint(w, fmt.Sprintf("%.0f\t%d\t%.2f\t%.2f\t%d\t", time.Since(start).Seconds(), totalMessages, messageRate, connectRate, totalSubscribedChannels))
 				fmt.Fprint(w, "\r\n")
 				w.Flush()
 				if message_limit > 0 && totalMessages >= uint64(message_limit) {