fix simplify code to start using context (#9350)

cmd/admin-handlers.go

@@ -982,16 +982,13 @@ func (a adminAPIHandlers) TraceHandler(w http.ResponseWriter, r *http.Request) {
 
 	w.Header().Set(xhttp.ContentType, "text/event-stream")
 
-	doneCh := make(chan struct{})
-	defer close(doneCh)
-
 	// Trace Publisher and peer-trace-client uses nonblocking send and hence does not wait for slow receivers.
 	// Use buffered channel to take care of burst sends or slow w.Write()
 	traceCh := make(chan interface{}, 4000)
 
 	peers := getRestClients(globalEndpoints)
 
-	globalHTTPTrace.Subscribe(traceCh, doneCh, func(entry interface{}) bool {
+	globalHTTPTrace.Subscribe(traceCh, ctx.Done(), func(entry interface{}) bool {
 		return mustTrace(entry, trcAll, trcErr)
 	})
 
@@ -999,7 +996,7 @@ func (a adminAPIHandlers) TraceHandler(w http.ResponseWriter, r *http.Request) {
 		if peer == nil {
 			continue
 		}
-		peer.Trace(traceCh, doneCh, trcAll, trcErr)
+		peer.Trace(traceCh, ctx.Done(), trcAll, trcErr)
 	}
 
 	keepAliveTicker := time.NewTicker(500 * time.Millisecond)
@@ -1018,7 +1015,7 @@ func (a adminAPIHandlers) TraceHandler(w http.ResponseWriter, r *http.Request) {
 				return
 			}
 			w.(http.Flusher).Flush()
-		case <-GlobalServiceDoneCh:
+		case <-ctx.Done():
 			return
 		}
 	}
@@ -1052,20 +1049,18 @@ func (a adminAPIHandlers) ConsoleLogHandler(w http.ResponseWriter, r *http.Reque
 	w.Header().Add("Connection", "close")
 	w.Header().Set(xhttp.ContentType, "text/event-stream")
 
-	doneCh := make(chan struct{})
-	defer close(doneCh)
 	logCh := make(chan interface{}, 4000)
 
 	peers := getRestClients(globalEndpoints)
 
-	globalConsoleSys.Subscribe(logCh, doneCh, node, limitLines, logKind, nil)
+	globalConsoleSys.Subscribe(logCh, ctx.Done(), node, limitLines, logKind, nil)
 
 	for _, peer := range peers {
 		if peer == nil {
 			continue
 		}
 		if node == "" || strings.EqualFold(peer.host.Name, node) {
-			peer.ConsoleLog(logCh, doneCh)
+			peer.ConsoleLog(logCh, ctx.Done())
 		}
 	}
 
@@ -1089,7 +1084,7 @@ func (a adminAPIHandlers) ConsoleLogHandler(w http.ResponseWriter, r *http.Reque
 				return
 			}
 			w.(http.Flusher).Flush()
-		case <-GlobalServiceDoneCh:
+		case <-ctx.Done():
 			return
 		}
 	}
@@ -1175,65 +1170,39 @@ func (a adminAPIHandlers) OBDInfoHandler(w http.ResponseWriter, r *http.Request)
 	}
 
 	vars := mux.Vars(r)
-	pulse := make(chan struct{})
-	obdDone := make(chan struct{})
 	obdInfo := madmin.OBDInfo{}
+	obdInfoCh := make(chan madmin.OBDInfo)
 
 	enc := json.NewEncoder(w)
-	doPartialWrite := func() {
+	partialWrite := func(oinfo madmin.OBDInfo) {
-		logger.LogIf(ctx, enc.Encode(obdInfo))
+		obdInfoCh <- oinfo
 	}
 
-	partialWrite := func() {
+	setCommonHeaders(w)
-		pulse <- struct{}{}
+	w.Header().Set(xhttp.ContentType, "text/event-stream")
-	}
+	w.WriteHeader(http.StatusOK)
-
-	finish := func() {
-		obdDone <- struct{}{}
-	}
 
 	errResp := func(err error) {
 		errorResponse := getAPIErrorResponse(ctx, toAdminAPIErr(ctx, err), r.URL.String(),
 			w.Header().Get(xhttp.AmzRequestID), globalDeploymentID)
 		encodedErrorResponse := encodeResponse(errorResponse)
 		obdInfo.Error = string(encodedErrorResponse)
-		finish()
+		logger.LogIf(ctx, enc.Encode(obdInfo))
 	}
 
 	deadline := 3600 * time.Second
-	deadlineStr := r.URL.Query().Get("deadline")
+	if dstr := r.URL.Query().Get("deadline"); dstr != "" {
-	if deadlineStr != "" {
 		var err error
-		deadline, err = time.ParseDuration(deadlineStr)
+		deadline, err = time.ParseDuration(dstr)
 		if err != nil {
 			errResp(err)
 			return
 		}
 	}
-	deadlinedCtx, cancel := context.WithDeadline(ctx, time.Now().Add(deadline))
 
-	setCommonHeaders(w)
+	deadlinedCtx, cancel := context.WithTimeout(ctx, deadline)
-	w.Header().Set(xhttp.ContentType, string(mimeJSON))
-	w.WriteHeader(http.StatusOK)
 
-	ticker := time.NewTicker(30 * time.Second)
+	defer cancel()
-	defer ticker.Stop()
-
-	go func() {
-	loop:
-		for {
-			select {
-			case <-ticker.C:
-				doPartialWrite()
-			case <-pulse:
-				doPartialWrite()
-			case <-obdDone:
-				break loop
-			}
-		}
-		w.(http.Flusher).Flush()
-		cancel()
-	}()
 
 	nsLock := objectAPI.NewNSLock(deadlinedCtx, minioMetaBucket, "obd-in-progress")
 	if err := nsLock.GetLock(newDynamicTimeout(deadline, deadline)); err != nil { // returns a locked lock
@@ -1242,89 +1211,114 @@ func (a adminAPIHandlers) OBDInfoHandler(w http.ResponseWriter, r *http.Request)
 	}
 	defer nsLock.Unlock()
 
-	if cpu, ok := vars["syscpu"]; ok && cpu == "true" {
+	go func() {
-		cpuInfo := getLocalCPUOBDInfo(deadlinedCtx)
+		defer close(obdInfoCh)
 
-		obdInfo.Sys.CPUInfo = append(obdInfo.Sys.CPUInfo, cpuInfo)
+		if cpu, ok := vars["syscpu"]; ok && cpu == "true" {
-		obdInfo.Sys.CPUInfo = append(obdInfo.Sys.CPUInfo, globalNotificationSys.CPUOBDInfo(deadlinedCtx)...)
+			cpuInfo := getLocalCPUOBDInfo(deadlinedCtx)
-		partialWrite()
-	}
 
-	if diskHw, ok := vars["sysdiskhw"]; ok && diskHw == "true" {
+			obdInfo.Sys.CPUInfo = append(obdInfo.Sys.CPUInfo, cpuInfo)
-		diskHwInfo := getLocalDiskHwOBD(deadlinedCtx)
+			obdInfo.Sys.CPUInfo = append(obdInfo.Sys.CPUInfo, globalNotificationSys.CPUOBDInfo(deadlinedCtx)...)
-
+			partialWrite(obdInfo)
-		obdInfo.Sys.DiskHwInfo = append(obdInfo.Sys.DiskHwInfo, diskHwInfo)
-		obdInfo.Sys.DiskHwInfo = append(obdInfo.Sys.DiskHwInfo, globalNotificationSys.DiskHwOBDInfo(deadlinedCtx)...)
-		partialWrite()
-	}
-
-	if osInfo, ok := vars["sysosinfo"]; ok && osInfo == "true" {
-		osInfo := getLocalOsInfoOBD(deadlinedCtx)
-
-		obdInfo.Sys.OsInfo = append(obdInfo.Sys.OsInfo, osInfo)
-		obdInfo.Sys.OsInfo = append(obdInfo.Sys.OsInfo, globalNotificationSys.OsOBDInfo(deadlinedCtx)...)
-		partialWrite()
-	}
-
-	if mem, ok := vars["sysmem"]; ok && mem == "true" {
-		memInfo := getLocalMemOBD(deadlinedCtx)
-
-		obdInfo.Sys.MemInfo = append(obdInfo.Sys.MemInfo, memInfo)
-		obdInfo.Sys.MemInfo = append(obdInfo.Sys.MemInfo, globalNotificationSys.MemOBDInfo(deadlinedCtx)...)
-		partialWrite()
-	}
-
-	if proc, ok := vars["sysprocess"]; ok && proc == "true" {
-		procInfo := getLocalProcOBD(deadlinedCtx)
-
-		obdInfo.Sys.ProcInfo = append(obdInfo.Sys.ProcInfo, procInfo)
-		obdInfo.Sys.ProcInfo = append(obdInfo.Sys.ProcInfo, globalNotificationSys.ProcOBDInfo(deadlinedCtx)...)
-		partialWrite()
-	}
-
-	if config, ok := vars["minioconfig"]; ok && config == "true" {
-		cfg, err := readServerConfig(ctx, objectAPI)
-		logger.LogIf(ctx, err)
-		obdInfo.Minio.Config = cfg
-		partialWrite()
-	}
-
-	if drive, ok := vars["perfdrive"]; ok && drive == "true" {
-		// Get drive obd details from local server's drive(s)
-		driveOBDSerial := getLocalDrivesOBD(deadlinedCtx, false, globalEndpoints, r)
-		driveOBDParallel := getLocalDrivesOBD(deadlinedCtx, true, globalEndpoints, r)
-
-		errStr := ""
-		if driveOBDSerial.Error != "" {
-			errStr = "serial: " + driveOBDSerial.Error
-		}
-		if driveOBDParallel.Error != "" {
-			errStr = errStr + " parallel: " + driveOBDParallel.Error
 		}
 
-		driveOBD := madmin.ServerDrivesOBDInfo{
+		if diskHw, ok := vars["sysdiskhw"]; ok && diskHw == "true" {
-			Addr:     driveOBDSerial.Addr,
+			diskHwInfo := getLocalDiskHwOBD(deadlinedCtx)
-			Serial:   driveOBDSerial.Serial,
+
-			Parallel: driveOBDParallel.Parallel,
+			obdInfo.Sys.DiskHwInfo = append(obdInfo.Sys.DiskHwInfo, diskHwInfo)
-			Error:    errStr,
+			obdInfo.Sys.DiskHwInfo = append(obdInfo.Sys.DiskHwInfo, globalNotificationSys.DiskHwOBDInfo(deadlinedCtx)...)
+			partialWrite(obdInfo)
 		}
-		obdInfo.Perf.DriveInfo = append(obdInfo.Perf.DriveInfo, driveOBD)
 
-		// Notify all other MinIO peers to report drive obd numbers
+		if osInfo, ok := vars["sysosinfo"]; ok && osInfo == "true" {
-		driveOBDs := globalNotificationSys.DriveOBDInfo(deadlinedCtx)
+			osInfo := getLocalOsInfoOBD(deadlinedCtx)
-		obdInfo.Perf.DriveInfo = append(obdInfo.Perf.DriveInfo, driveOBDs...)
 
-		partialWrite()
+			obdInfo.Sys.OsInfo = append(obdInfo.Sys.OsInfo, osInfo)
+			obdInfo.Sys.OsInfo = append(obdInfo.Sys.OsInfo, globalNotificationSys.OsOBDInfo(deadlinedCtx)...)
+			partialWrite(obdInfo)
+		}
+
+		if mem, ok := vars["sysmem"]; ok && mem == "true" {
+			memInfo := getLocalMemOBD(deadlinedCtx)
+
+			obdInfo.Sys.MemInfo = append(obdInfo.Sys.MemInfo, memInfo)
+			obdInfo.Sys.MemInfo = append(obdInfo.Sys.MemInfo, globalNotificationSys.MemOBDInfo(deadlinedCtx)...)
+			partialWrite(obdInfo)
+		}
+
+		if proc, ok := vars["sysprocess"]; ok && proc == "true" {
+			procInfo := getLocalProcOBD(deadlinedCtx)
+
+			obdInfo.Sys.ProcInfo = append(obdInfo.Sys.ProcInfo, procInfo)
+			obdInfo.Sys.ProcInfo = append(obdInfo.Sys.ProcInfo, globalNotificationSys.ProcOBDInfo(deadlinedCtx)...)
+			partialWrite(obdInfo)
+		}
+
+		if config, ok := vars["minioconfig"]; ok && config == "true" {
+			cfg, err := readServerConfig(ctx, objectAPI)
+			logger.LogIf(ctx, err)
+			obdInfo.Minio.Config = cfg
+			partialWrite(obdInfo)
+		}
+
+		if drive, ok := vars["perfdrive"]; ok && drive == "true" {
+			// Get drive obd details from local server's drive(s)
+			driveOBDSerial := getLocalDrivesOBD(deadlinedCtx, false, globalEndpoints, r)
+			driveOBDParallel := getLocalDrivesOBD(deadlinedCtx, true, globalEndpoints, r)
+
+			errStr := ""
+			if driveOBDSerial.Error != "" {
+				errStr = "serial: " + driveOBDSerial.Error
+			}
+			if driveOBDParallel.Error != "" {
+				errStr = errStr + " parallel: " + driveOBDParallel.Error
+			}
+
+			driveOBD := madmin.ServerDrivesOBDInfo{
+				Addr:     driveOBDSerial.Addr,
+				Serial:   driveOBDSerial.Serial,
+				Parallel: driveOBDParallel.Parallel,
+				Error:    errStr,
+			}
+			obdInfo.Perf.DriveInfo = append(obdInfo.Perf.DriveInfo, driveOBD)
+
+			// Notify all other MinIO peers to report drive obd numbers
+			driveOBDs := globalNotificationSys.DriveOBDInfo(deadlinedCtx)
+			obdInfo.Perf.DriveInfo = append(obdInfo.Perf.DriveInfo, driveOBDs...)
+
+			partialWrite(obdInfo)
+		}
+
+		if net, ok := vars["perfnet"]; ok && net == "true" && globalIsDistXL {
+			obdInfo.Perf.Net = append(obdInfo.Perf.Net, globalNotificationSys.NetOBDInfo(deadlinedCtx))
+			obdInfo.Perf.Net = append(obdInfo.Perf.Net, globalNotificationSys.DispatchNetOBDInfo(deadlinedCtx)...)
+			obdInfo.Perf.NetParallel = globalNotificationSys.NetOBDParallelInfo(deadlinedCtx)
+			partialWrite(obdInfo)
+		}
+	}()
+
+	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case oinfo, ok := <-obdInfoCh:
+			if !ok {
+				return
+			}
+			logger.LogIf(ctx, enc.Encode(oinfo))
+			w.(http.Flusher).Flush()
+		case <-ticker.C:
+			if _, err := w.Write([]byte(" ")); err != nil {
+				return
+			}
+			w.(http.Flusher).Flush()
+		case <-deadlinedCtx.Done():
+			w.(http.Flusher).Flush()
+			return
+		}
 	}
 
-	if net, ok := vars["perfnet"]; ok && net == "true" && globalIsDistXL {
-		obdInfo.Perf.Net = append(obdInfo.Perf.Net, globalNotificationSys.NetOBDInfo(deadlinedCtx))
-		obdInfo.Perf.Net = append(obdInfo.Perf.Net, globalNotificationSys.DispatchNetOBDInfo(deadlinedCtx)...)
-		obdInfo.Perf.NetParallel = globalNotificationSys.NetOBDParallelInfo(deadlinedCtx)
-		partialWrite()
-	}
-
-	finish()
 }
 
 // ServerInfoHandler - GET /minio/admin/v3/info
@@ -1488,7 +1482,7 @@ func (a adminAPIHandlers) ServerInfoHandler(w http.ResponseWriter, r *http.Reque
 func fetchLambdaInfo(cfg config.Config) []map[string][]madmin.TargetIDStatus {
 
 	// Fetch the configured targets
-	targetList, err := notify.FetchRegisteredTargets(cfg, GlobalServiceDoneCh, NewGatewayHTTPTransport(), true, false)
+	targetList, err := notify.FetchRegisteredTargets(cfg, GlobalContext.Done(), NewGatewayHTTPTransport(), true, false)
 	if err != nil && err != notify.ErrTargetsOffline {
 		logger.LogIf(GlobalContext, err)
 		return nil

cmd/bucket-notification-handlers.go

@@ -282,16 +282,13 @@ func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWrit
 
 	w.Header().Set(xhttp.ContentType, "text/event-stream")
 
-	doneCh := make(chan struct{})
-	defer close(doneCh)
-
 	// Listen Publisher and peer-listen-client uses nonblocking send and hence does not wait for slow receivers.
 	// Use buffered channel to take care of burst sends or slow w.Write()
 	listenCh := make(chan interface{}, 4000)
 
 	peers := getRestClients(globalEndpoints)
 
-	globalHTTPListen.Subscribe(listenCh, doneCh, func(evI interface{}) bool {
+	globalHTTPListen.Subscribe(listenCh, ctx.Done(), func(evI interface{}) bool {
 		ev, ok := evI.(event.Event)
 		if !ok {
 			return false
@@ -310,7 +307,7 @@ func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWrit
 		if peer == nil {
 			continue
 		}
-		peer.Listen(listenCh, doneCh, values)
+		peer.Listen(listenCh, ctx.Done(), values)
 	}
 
 	keepAliveTicker := time.NewTicker(500 * time.Millisecond)
@@ -336,7 +333,7 @@ func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWrit
 				return
 			}
 			w.(http.Flusher).Flush()
-		case <-GlobalServiceDoneCh:
+		case <-ctx.Done():
 			return
 		}
 	}

cmd/config-current.go

@@ -307,7 +307,7 @@ func validateConfig(s config.Config) error {
 		return err
 	}
 
-	return notify.TestNotificationTargets(s, GlobalServiceDoneCh, NewGatewayHTTPTransport(),
+	return notify.TestNotificationTargets(s, GlobalContext.Done(), NewGatewayHTTPTransport(),
 		globalNotificationSys.ConfiguredTargetIDs())
 }
 
@@ -469,12 +469,12 @@ func lookupConfigs(s config.Config) {
 		}
 	}
 
-	globalConfigTargetList, err = notify.GetNotificationTargets(s, GlobalServiceDoneCh, NewGatewayHTTPTransport())
+	globalConfigTargetList, err = notify.GetNotificationTargets(s, GlobalContext.Done(), NewGatewayHTTPTransport())
 	if err != nil {
 		logger.LogIf(ctx, fmt.Errorf("Unable to initialize notification target(s): %w", err))
 	}
 
-	globalEnvTargetList, err = notify.GetNotificationTargets(newServerConfig(), GlobalServiceDoneCh, NewGatewayHTTPTransport())
+	globalEnvTargetList, err = notify.GetNotificationTargets(newServerConfig(), GlobalContext.Done(), NewGatewayHTTPTransport())
 	if err != nil {
 		logger.LogIf(ctx, fmt.Errorf("Unable to initialize notification target(s): %w", err))
 	}

cmd/config.go

@@ -186,16 +186,14 @@ func (sys *ConfigSys) Load(objAPI ObjectLayer) error {
 }
 
 // WatchConfigNASDisk - watches nas disk on periodic basis.
-func (sys *ConfigSys) WatchConfigNASDisk(objAPI ObjectLayer) {
+func (sys *ConfigSys) WatchConfigNASDisk(ctx context.Context, objAPI ObjectLayer) {
 	configInterval := globalRefreshIAMInterval
 	watchDisk := func() {
-		ticker := time.NewTicker(configInterval)
-		defer ticker.Stop()
 		for {
 			select {
-			case <-GlobalServiceDoneCh:
+			case <-ctx.Done():
 				return
-			case <-ticker.C:
+			case <-time.After(configInterval):
 				loadConfig(objAPI)
 			}
 		}

cmd/consolelogger.go

@@ -74,7 +74,7 @@ func (sys *HTTPConsoleLoggerSys) HasLogListeners() bool {
 }
 
 // Subscribe starts console logging for this node.
-func (sys *HTTPConsoleLoggerSys) Subscribe(subCh chan interface{}, doneCh chan struct{}, node string, last int, logKind string, filter func(entry interface{}) bool) {
+func (sys *HTTPConsoleLoggerSys) Subscribe(subCh chan interface{}, doneCh <-chan struct{}, node string, last int, logKind string, filter func(entry interface{}) bool) {
 	// Enable console logging for remote client.
 	if !sys.HasLogListeners() {
 		logger.AddTarget(sys)

cmd/fs-v1-multipart.go

@@ -757,13 +757,13 @@ func (fs *FSObjects) AbortMultipartUpload(ctx context.Context, bucket, object, u
 // Removes multipart uploads if any older than `expiry` duration
 // on all buckets for every `cleanupInterval`, this function is
 // blocking and should be run in a go-routine.
-func (fs *FSObjects) cleanupStaleMultipartUploads(ctx context.Context, cleanupInterval, expiry time.Duration, doneCh <-chan struct{}) {
+func (fs *FSObjects) cleanupStaleMultipartUploads(ctx context.Context, cleanupInterval, expiry time.Duration) {
 	ticker := time.NewTicker(cleanupInterval)
 	defer ticker.Stop()
 
 	for {
 		select {
-		case <-doneCh:
+		case <-ctx.Done():
 			return
 		case <-ticker.C:
 			now := time.Now()

cmd/fs-v1-multipart_test.go

@@ -51,7 +51,7 @@ func TestFSCleanupMultipartUploadsInRoutine(t *testing.T) {
 	cleanupWg.Add(1)
 	go func() {
 		defer cleanupWg.Done()
-		fs.cleanupStaleMultipartUploads(GlobalContext, time.Millisecond, 0, ctx.Done())
+		fs.cleanupStaleMultipartUploads(ctx, time.Millisecond, 0)
 	}()
 
 	// Wait for 100ms such that - we have given enough time for

cmd/fs-v1.go

@@ -179,7 +179,7 @@ func NewFSObjectLayer(fsPath string) (ObjectLayer, error) {
 	// or cause changes on backend format.
 	fs.fsFormatRlk = rlk
 
-	go fs.cleanupStaleMultipartUploads(ctx, GlobalMultipartCleanupInterval, GlobalMultipartExpiry, GlobalServiceDoneCh)
+	go fs.cleanupStaleMultipartUploads(ctx, GlobalMultipartCleanupInterval, GlobalMultipartExpiry)
 
 	// Return successfully initialized object layer.
 	return fs, nil

cmd/gateway-main.go

@@ -244,7 +244,7 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		logger.FatalIf(globalNotificationSys.Init(buckets, newObject), "Unable to initialize notification system")
 		// Start watching disk for reloading config, this
 		// is only enabled for "NAS" gateway.
-		globalConfigSys.WatchConfigNASDisk(newObject)
+		globalConfigSys.WatchConfigNASDisk(GlobalContext, newObject)
 	}
 	// This is only to uniquely identify each gateway deployments.
 	globalDeploymentID = env.Get("MINIO_GATEWAY_DEPLOYMENT_ID", mustGetUUID())

cmd/gateway/s3/gateway-s3-sse.go

@@ -679,13 +679,13 @@ func getGWContentPath(object string) string {
 }
 
 // Clean-up the stale incomplete encrypted multipart uploads. Should be run in a Go routine.
-func (l *s3EncObjects) cleanupStaleEncMultipartUploads(ctx context.Context, cleanupInterval, expiry time.Duration, doneCh <-chan struct{}) {
+func (l *s3EncObjects) cleanupStaleEncMultipartUploads(ctx context.Context, cleanupInterval, expiry time.Duration) {
 	ticker := time.NewTicker(cleanupInterval)
 	defer ticker.Stop()
 
 	for {
 		select {
-		case <-doneCh:
+		case <-ctx.Done():
 			return
 		case <-ticker.C:
 			l.cleanupStaleEncMultipartUploadsOnGW(ctx, expiry)

cmd/gateway/s3/gateway-s3.go

@@ -242,7 +242,7 @@ func (g *S3) NewGatewayLayer(creds auth.Credentials) (minio.ObjectLayer, error)
 
 		// Start stale enc multipart uploads cleanup routine.
 		go encS.cleanupStaleEncMultipartUploads(minio.GlobalContext,
-			minio.GlobalMultipartCleanupInterval, minio.GlobalMultipartExpiry, minio.GlobalServiceDoneCh)
+			minio.GlobalMultipartCleanupInterval, minio.GlobalMultipartExpiry)
 
 		return &encS, nil
 	}

cmd/peer-rest-client.go

@@ -834,7 +834,7 @@ func (client *peerRESTClient) BackgroundHealStatus() (madmin.BgHealState, error)
 	return state, err
 }
 
-func (client *peerRESTClient) doTrace(traceCh chan interface{}, doneCh chan struct{}, trcAll, trcErr bool) {
+func (client *peerRESTClient) doTrace(traceCh chan interface{}, doneCh <-chan struct{}, trcAll, trcErr bool) {
 	values := make(url.Values)
 	values.Set(peerRESTTraceAll, strconv.FormatBool(trcAll))
 	values.Set(peerRESTTraceErr, strconv.FormatBool(trcErr))
@@ -876,7 +876,7 @@ func (client *peerRESTClient) doTrace(traceCh chan interface{}, doneCh chan stru
 	}
 }
 
-func (client *peerRESTClient) doListen(listenCh chan interface{}, doneCh chan struct{}, v url.Values) {
+func (client *peerRESTClient) doListen(listenCh chan interface{}, doneCh <-chan struct{}, v url.Values) {
 	// To cancel the REST request in case doneCh gets closed.
 	ctx, cancel := context.WithCancel(GlobalContext)
 
@@ -915,7 +915,7 @@ func (client *peerRESTClient) doListen(listenCh chan interface{}, doneCh chan st
 }
 
 // Listen - listen on peers.
-func (client *peerRESTClient) Listen(listenCh chan interface{}, doneCh chan struct{}, v url.Values) {
+func (client *peerRESTClient) Listen(listenCh chan interface{}, doneCh <-chan struct{}, v url.Values) {
 	go func() {
 		for {
 			client.doListen(listenCh, doneCh, v)
@@ -931,7 +931,7 @@ func (client *peerRESTClient) Listen(listenCh chan interface{}, doneCh chan stru
 }
 
 // Trace - send http trace request to peer nodes
-func (client *peerRESTClient) Trace(traceCh chan interface{}, doneCh chan struct{}, trcAll, trcErr bool) {
+func (client *peerRESTClient) Trace(traceCh chan interface{}, doneCh <-chan struct{}, trcAll, trcErr bool) {
 	go func() {
 		for {
 			client.doTrace(traceCh, doneCh, trcAll, trcErr)
@@ -947,7 +947,7 @@ func (client *peerRESTClient) Trace(traceCh chan interface{}, doneCh chan struct
 }
 
 // ConsoleLog - sends request to peer nodes to get console logs
-func (client *peerRESTClient) ConsoleLog(logCh chan interface{}, doneCh chan struct{}) {
+func (client *peerRESTClient) ConsoleLog(logCh chan interface{}, doneCh <-chan struct{}) {
 	go func() {
 		for {
 			// get cancellation context to properly unsubscribe peers

pkg/pubsub/pubsub.go

@@ -50,7 +50,7 @@ func (ps *PubSub) Publish(item interface{}) {
 }
 
 // Subscribe - Adds a subscriber to pubsub system
-func (ps *PubSub) Subscribe(subCh chan interface{}, doneCh chan struct{}, filter func(entry interface{}) bool) {
+func (ps *PubSub) Subscribe(subCh chan interface{}, doneCh <-chan struct{}, filter func(entry interface{}) bool) {
 	ps.Lock()
 	defer ps.Unlock()