Logging

cmd/access.go

@@ -28,7 +28,7 @@ var cmdAccess = &cli.Command{
 	Usage:     "Grant/revoke access to a topic, or show access",
 	UsageText: "ntfy access [USERNAME [TOPIC [PERMISSION]]]",
 	Flags:     flagsAccess,
-	Before:    initLogFunc(initConfigFileInputSourceFunc("config", flagsAccess)),
+	Before:    initConfigFileInputSourceFunc("config", flagsAccess, initLogFunc),
 	Action:    execUserAccess,
 	Category:  categoryServer,
 	Description: `Manage the access control list for the ntfy server.

cmd/app.go

@@ -3,6 +3,7 @@ package cmd
 
 import (
 	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2/altsrc"
 	"heckel.io/ntfy/log"
 	"os"
 )
@@ -16,7 +17,7 @@ var commands = make([]*cli.Command, 0)
 
 var flagsDefault = []cli.Flag{
 	&cli.BoolFlag{Name: "debug", Aliases: []string{"d"}, EnvVars: []string{"NTFY_DEBUG"}, Usage: "enable debug logging"},
-	&cli.StringFlag{Name: "log-level", Aliases: []string{"log_level"}, Value: log.InfoLevel.String(), EnvVars: []string{"NTFY_LOG_LEVEL"}, Usage: "set log level"},
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "log-level", Aliases: []string{"log_level"}, Value: log.InfoLevel.String(), EnvVars: []string{"NTFY_LOG_LEVEL"}, Usage: "set log level"}),
 }
 
 // New creates a new CLI application
@@ -32,22 +33,15 @@ func New() *cli.App {
 		ErrWriter:              os.Stderr,
 		Commands:               commands,
 		Flags:                  flagsDefault,
-		Before:                 initLogFunc(nil),
+		Before:                 initLogFunc,
 	}
 }
 
-func initLogFunc(next cli.BeforeFunc) cli.BeforeFunc {
-	return func(c *cli.Context) error {
-		if c.Bool("debug") {
-			log.SetLevel(log.DebugLevel)
-		} else {
-			log.SetLevel(log.ToLevel(c.String("log-level")))
-		}
-		if next != nil {
-			if err := next(c); err != nil {
-				return err
-			}
-		}
-		return nil
+func initLogFunc(c *cli.Context) error {
+	if c.Bool("debug") {
+		log.SetLevel(log.DebugLevel)
+	} else {
+		log.SetLevel(log.ToLevel(c.String("log-level")))
 	}
+	return nil
 }

cmd/config_loader.go

@@ -11,7 +11,7 @@ import (
 
 // initConfigFileInputSourceFunc is like altsrc.InitInputSourceWithContext and altsrc.NewYamlSourceFromFlagFunc, but checks
 // if the config flag is exists and only loads it if it does. If the flag is set and the file exists, it fails.
-func initConfigFileInputSourceFunc(configFlag string, flags []cli.Flag) cli.BeforeFunc {
+func initConfigFileInputSourceFunc(configFlag string, flags []cli.Flag, next cli.BeforeFunc) cli.BeforeFunc {
 	return func(context *cli.Context) error {
 		configFile := context.String(configFlag)
 		if context.IsSet(configFlag) && !util.FileExists(configFile) {
@@ -23,7 +23,15 @@ func initConfigFileInputSourceFunc(configFlag string, flags []cli.Flag) cli.Befo
 		if err != nil {
 			return err
 		}
-		return altsrc.ApplyInputSourceValues(context, inputSource, flags)
+		if err := altsrc.ApplyInputSourceValues(context, inputSource, flags); err != nil {
+			return err
+		}
+		if next != nil {
+			if err := next(context); err != nil {
+				return err
+			}
+		}
+		return nil
 	}
 }
 

cmd/publish.go

@@ -44,7 +44,7 @@ var cmdPublish = &cli.Command{
 	Action:    execPublish,
 	Category:  categoryClient,
 	Flags:     flagsPublish,
-	Before:    initLogFunc(nil),
+	Before:    initLogFunc,
 	Description: `Publish a message to a ntfy server.
 
 Examples:

cmd/serve.go

@@ -8,7 +8,10 @@ import (
 	"heckel.io/ntfy/log"
 	"math"
 	"net"
+	"os"
+	"os/signal"
 	"strings"
+	"syscall"
 	"time"
 
 	"github.com/urfave/cli/v2"
@@ -21,9 +24,13 @@ func init() {
 	commands = append(commands, cmdServe)
 }
 
+const (
+	defaultServerConfigFile = "/etc/ntfy/server.yml"
+)
+
 var flagsServe = append(
 	flagsDefault,
-	&cli.StringFlag{Name: "config", Aliases: []string{"c"}, EnvVars: []string{"NTFY_CONFIG_FILE"}, Value: "/etc/ntfy/server.yml", DefaultText: "/etc/ntfy/server.yml", Usage: "config file"},
+	&cli.StringFlag{Name: "config", Aliases: []string{"c"}, EnvVars: []string{"NTFY_CONFIG_FILE"}, Value: defaultServerConfigFile, DefaultText: defaultServerConfigFile, Usage: "config file"},
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "base-url", Aliases: []string{"base_url", "B"}, EnvVars: []string{"NTFY_BASE_URL"}, Usage: "externally visible base URL for this host (e.g. https://ntfy.sh)"}),
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "listen-http", Aliases: []string{"listen_http", "l"}, EnvVars: []string{"NTFY_LISTEN_HTTP"}, Value: server.DefaultListenHTTP, Usage: "ip:port used to as HTTP listen address"}),
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "listen-https", Aliases: []string{"listen_https", "L"}, EnvVars: []string{"NTFY_LISTEN_HTTPS"}, Usage: "ip:port used to as HTTPS listen address"}),
@@ -69,7 +76,7 @@ var cmdServe = &cli.Command{
 	Action:    execServe,
 	Category:  categoryServer,
 	Flags:     flagsServe,
-	Before:    initLogFunc(initConfigFileInputSourceFunc("config", flagsServe)),
+	Before:    initConfigFileInputSourceFunc("config", flagsServe, initLogFunc),
 	Description: `Run the ntfy server and listen for incoming requests
 
 The command will load the configuration from /etc/ntfy/server.yml. Config options can 
@@ -86,6 +93,7 @@ func execServe(c *cli.Context) error {
 	}
 
 	// Read all the options
+	config := c.String("config")
 	baseURL := c.String("base-url")
 	listenHTTP := c.String("listen-http")
 	listenHTTPS := c.String("listen-https")
@@ -241,11 +249,15 @@ func execServe(c *cli.Context) error {
 	conf.VisitorEmailLimitReplenish = visitorEmailLimitReplenish
 	conf.BehindProxy = behindProxy
 	conf.EnableWeb = enableWeb
+
+	// Set up hot-reloading of config
+	go sigHandlerConfigReload(config)
+
+	// Run server
 	s, err := server.New(conf)
 	if err != nil {
 		log.Fatal(err)
-	}
-	if err := s.Run(); err != nil {
+	} else if err := s.Run(); err != nil {
 		log.Fatal(err)
 	}
 	log.Info("Exiting.")
@@ -262,3 +274,28 @@ func parseSize(s string, defaultValue int64) (v int64, err error) {
 	}
 	return v, nil
 }
+
+func sigHandlerConfigReload(config string) {
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGHUP)
+	for range sigs {
+		log.Info("Partially hot reloading configuration ...")
+		inputSource, err := newYamlSourceFromFile(config, flagsServe)
+		if err != nil {
+			log.Warn("Hot reload failed: %s", err.Error())
+			continue
+		}
+		reloadLogLevel(inputSource)
+	}
+}
+
+func reloadLogLevel(inputSource altsrc.InputSourceContext) {
+	newLevelStr, err := inputSource.String("log-level")
+	if err != nil {
+		log.Warn("Cannot load log level: %s", err.Error())
+		return
+	}
+	newLevel := log.ToLevel(newLevelStr)
+	log.SetLevel(newLevel)
+	log.Info("Log level is %s", newLevel.String())
+}

cmd/subscribe.go

@@ -43,7 +43,7 @@ var cmdSubscribe = &cli.Command{
 	Action:    execSubscribe,
 	Category:  categoryClient,
 	Flags:     flagsSubscribe,
-	Before:    initLogFunc(nil),
+	Before:    initLogFunc,
 	Description: `Subscribe to a topic from a ntfy server, and either print or execute a command for 
 every arriving message. There are 3 modes in which the command can be run:
 
@@ -253,7 +253,7 @@ func loadConfig(c *cli.Context) (*client.Config, error) {
 	if filename != "" {
 		return client.LoadConfig(filename)
 	}
-	configFile := defaultConfigFile()
+	configFile := defaultClientConfigFile()
 	if s, _ := os.Stat(configFile); s != nil {
 		return client.LoadConfig(configFile)
 	}
@@ -261,7 +261,7 @@ func loadConfig(c *cli.Context) (*client.Config, error) {
 }
 
 //lint:ignore U1000 Conditionally used in different builds
-func defaultConfigFileUnix() string {
+func defaultClientConfigFileUnix() string {
 	u, _ := user.Current()
 	configFile := clientRootConfigFileUnixAbsolute
 	if u.Uid != "0" {
@@ -272,7 +272,7 @@ func defaultConfigFileUnix() string {
 }
 
 //lint:ignore U1000 Conditionally used in different builds
-func defaultConfigFileWindows() string {
+func defaultClientConfigFileWindows() string {
 	homeDir, _ := os.UserConfigDir()
 	return filepath.Join(homeDir, clientUserConfigFileWindowsRelative)
 }

cmd/subscribe_darwin.go

@@ -11,6 +11,6 @@ var (
 	scriptLauncher = []string{"sh", "-c"}
 )
 
-func defaultConfigFile() string {
-	return defaultConfigFileUnix()
+func defaultClientConfigFile() string {
+	return defaultClientConfigFileUnix()
 }

cmd/subscribe_linux.go

@@ -11,6 +11,6 @@ var (
 	scriptLauncher = []string{"sh", "-c"}
 )
 
-func defaultConfigFile() string {
-	return defaultConfigFileUnix()
+func defaultClientConfigFile() string {
+	return defaultClientConfigFileUnix()
 }

cmd/subscribe_windows.go

@@ -11,5 +11,5 @@ var (
 )
 
 func defaultConfigFile() string {
-	return defaultConfigFileWindows()
+	return defaultClientConfigFileWindows()
 }

cmd/user.go

@@ -29,7 +29,7 @@ var cmdUser = &cli.Command{
 	Usage:     "Manage/show users",
 	UsageText: "ntfy user [list|add|remove|change-pass|change-role] ...",
 	Flags:     flagsUser,
-	Before:    initLogFunc(initConfigFileInputSourceFunc("config", flagsUser)),
+	Before:    initConfigFileInputSourceFunc("config", flagsUser, initLogFunc),
 	Category:  categoryServer,
 	Subcommands: []*cli.Command{
 		{

log/log.go

@@ -3,10 +3,13 @@ package log
 import (
 	"log"
 	"strings"
+	"sync"
 )
 
+// Level is a well-known log level, as defined below
 type Level int
 
+// Well known log levels
 const (
 	DebugLevel Level = iota
 	InfoLevel
@@ -30,32 +33,50 @@ func (l Level) String() string {
 
 var (
 	level = InfoLevel
+	mu    = &sync.Mutex{}
 )
 
+// Debug prints the given message, if the current log level is DEBUG
 func Debug(message string, v ...interface{}) {
 	logIf(DebugLevel, message, v...)
 }
 
+// Info prints the given message, if the current log level is INFO or lower
 func Info(message string, v ...interface{}) {
 	logIf(InfoLevel, message, v...)
 }
 
+// Warn prints the given message, if the current log level is WARN or lower
 func Warn(message string, v ...interface{}) {
 	logIf(WarnLevel, message, v...)
 }
 
+// Error prints the given message, if the current log level is ERROR or lower
 func Error(message string, v ...interface{}) {
 	logIf(ErrorLevel, message, v...)
 }
 
+// Fatal prints the given message, and exits the program
 func Fatal(v ...interface{}) {
 	log.Fatalln(v...)
 }
 
+// CurrentLevel returns the current log level
+func CurrentLevel() Level {
+	mu.Lock()
+	defer mu.Unlock()
+	return level
+}
+
+// SetLevel sets a new log level
 func SetLevel(newLevel Level) {
+	mu.Lock()
+	defer mu.Unlock()
 	level = newLevel
 }
 
+// ToLevel converts a string to a Level. It returns InfoLevel if the string
+// does not match any known log levels.
 func ToLevel(s string) Level {
 	switch strings.ToLower(s) {
 	case "debug":
@@ -67,13 +88,12 @@ func ToLevel(s string) Level {
 	case "error":
 		return ErrorLevel
 	default:
-		log.Fatalf("unknown log level: %s", s)
-		return 0
+		return InfoLevel
 	}
 }
 
 func logIf(l Level, message string, v ...interface{}) {
-	if level <= l {
+	if CurrentLevel() <= l {
 		log.Printf(l.String()+" "+message, v...)
 	}
 }

server/ntfy.service

@@ -6,6 +6,7 @@ After=network.target
 User=ntfy
 Group=ntfy
 ExecStart=/usr/bin/ntfy serve
+ExecReload=/bin/kill --signal HUP $MAINPID
 Restart=on-failure
 AmbientCapabilities=CAP_NET_BIND_SERVICE
 LimitNOFILE=10000

server/server.go

@@ -179,7 +179,7 @@ func (s *Server) Run() error {
 	if s.config.SMTPServerListen != "" {
 		listenStr += fmt.Sprintf(" %s[smtp]", s.config.SMTPServerListen)
 	}
-	log.Info("Listening on%s", listenStr)
+	log.Info("Listening on%s, log level is %s", listenStr, log.CurrentLevel().String())
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", s.handle)
 	errChan := make(chan error)
@@ -246,18 +246,28 @@ func (s *Server) Stop() {
 
 func (s *Server) handle(w http.ResponseWriter, r *http.Request) {
 	v := s.visitor(r)
-	log.Debug("[%s] %s %s", v.ip, r.Method, r.URL.Path)
-
+	log.Debug("%s HTTP %s %s", v.ip, r.Method, r.URL.Path)
 	if err := s.handleInternal(w, r, v); err != nil {
 		if websocket.IsWebSocketUpgrade(r) {
-			log.Info("[%s] WS %s %s - %s", v.ip, r.Method, r.URL.Path, err.Error())
+			isNormalError := websocket.IsCloseError(err, websocket.CloseAbnormalClosure) || strings.Contains(err.Error(), "i/o timeout")
+			if isNormalError {
+				log.Debug("%s WS %s %s - %s", v.ip, r.Method, r.URL.Path, err.Error())
+			} else {
+				log.Warn("%s WS %s %s - %s", v.ip, r.Method, r.URL.Path, err.Error())
+			}
 			return // Do not attempt to write to upgraded connection
 		}
 		httpErr, ok := err.(*errHTTP)
 		if !ok {
 			httpErr = errHTTPInternalError
 		}
-		log.Info("[%s] HTTP %s %s - %d - %d - %s", v.ip, r.Method, r.URL.Path, httpErr.HTTPCode, httpErr.Code, err.Error())
+		isNormalError := httpErr.Code == 404
+		if isNormalError {
+			log.Debug("%s HTTP %s %s - %d - %d - %s", v.ip, r.Method, r.URL.Path, httpErr.HTTPCode, httpErr.Code, err.Error())
+		} else {
+			log.Info("%s HTTP %s %s - %d - %d - %s", v.ip, r.Method, r.URL.Path, httpErr.HTTPCode, httpErr.Code, err.Error())
+		}
+
 		w.Header().Set("Content-Type", "application/json")
 		w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
 		w.WriteHeader(httpErr.HTTPCode)
@@ -434,21 +444,23 @@ func (s *Server) handlePublish(w http.ResponseWriter, r *http.Request, v *visito
 		m.Message = emptyMessageBody
 	}
 	delayed := m.Time > time.Now().Unix()
-	log.Debug("[%s] %s %s: ev=%s, body=%d bytes, delayed=%t, fb=%t, cache=%t, up=%t, email=%s",
-		v.ip, r.Method, r.URL.Path, m.Event, len(body.PeekedBytes), delayed, firebase, cache, unifiedpush, email)
+	log.Debug("%s Received message: ev=%s, body=%d bytes, delayed=%t, fb=%t, cache=%t, up=%t, email=%s",
+		logPrefix(v, m), m.Event, len(body.PeekedBytes), delayed, firebase, cache, unifiedpush, email)
 	if !delayed {
 		if err := t.Publish(v, m); err != nil {
 			return err
 		}
-	}
-	if s.firebaseClient != nil && firebase && !delayed {
-		go s.sendToFirebase(v, m)
-	}
-	if s.mailer != nil && email != "" && !delayed {
-		go s.sendEmail(v, m, email)
-	}
-	if s.config.UpstreamBaseURL != "" && !delayed {
-		go s.forwardPollRequest(v, m)
+		if s.firebaseClient != nil && firebase {
+			go s.sendToFirebase(v, m)
+		}
+		if s.mailer != nil && email != "" {
+			go s.sendEmail(v, m, email)
+		}
+		if s.config.UpstreamBaseURL != "" {
+			go s.forwardPollRequest(v, m)
+		}
+	} else {
+		log.Debug("%s Message delayed, will process later", logPrefix(v, m))
 	}
 	if cache {
 		if err := s.messageCache.AddMessage(m); err != nil {
@@ -467,14 +479,16 @@ func (s *Server) handlePublish(w http.ResponseWriter, r *http.Request, v *visito
 }
 
 func (s *Server) sendToFirebase(v *visitor, m *message) {
+	log.Debug("%s Publishing to Firebase", logPrefix(v, m))
 	if err := s.firebaseClient.Send(v, m); err != nil {
-		log.Warn("[%s] FB - Unable to publish to Firebase: %v", v.ip, err.Error())
+		log.Warn("%s Unable to publish to Firebase: %v", logPrefix(v, m), err.Error())
 	}
 }
 
 func (s *Server) sendEmail(v *visitor, m *message, email string) {
+	log.Debug("%s Sending email to %s", logPrefix(v, m), email)
 	if err := s.mailer.Send(v.ip, email, m); err != nil {
-		log.Warn("[%s] MAIL - Unable to send email: %v", v.ip, err.Error())
+		log.Warn("%s Unable to send email: %v", logPrefix(v, m), err.Error())
 	}
 }
 
@@ -482,9 +496,10 @@ func (s *Server) forwardPollRequest(v *visitor, m *message) {
 	topicURL := fmt.Sprintf("%s/%s", s.config.BaseURL, m.Topic)
 	topicHash := fmt.Sprintf("%x", sha256.Sum256([]byte(topicURL)))
 	forwardURL := fmt.Sprintf("%s/%s", s.config.UpstreamBaseURL, topicHash)
+	log.Debug("%s Publishing poll request to %s", logPrefix(v, m), forwardURL)
 	req, err := http.NewRequest("POST", forwardURL, strings.NewReader(""))
 	if err != nil {
-		log.Warn("[%s] FWD - Unable to forward poll request: %v", v.ip, err.Error())
+		log.Warn("%s Unable to publish poll request: %v", logPrefix(v, m), err.Error())
 		return
 	}
 	req.Header.Set("X-Poll-ID", m.ID)
@@ -493,10 +508,10 @@ func (s *Server) forwardPollRequest(v *visitor, m *message) {
 	}
 	response, err := httpClient.Do(req)
 	if err != nil {
-		log.Warn("[%s] FWD - Unable to forward poll request: %v", v.ip, err.Error())
+		log.Warn("%s Unable to publish poll request: %v", logPrefix(v, m), err.Error())
 		return
 	} else if response.StatusCode != http.StatusOK {
-		log.Warn("[%s] FWD - Unable to forward poll request, unexpected status: %d", v.ip, response.StatusCode)
+		log.Warn("%s Unable to publish poll request, unexpected HTTP status: %d", logPrefix(v, m), response.StatusCode)
 		return
 	}
 }
@@ -1012,6 +1027,7 @@ func (s *Server) updateStatsAndPrune() {
 	// Expire visitors from rate visitors map
 	for ip, v := range s.visitors {
 		if v.Stale() {
+			log.Debug("Deleting stale visitor %s", v.ip)
 			delete(s.visitors, ip)
 		}
 	}
@@ -1019,17 +1035,21 @@ func (s *Server) updateStatsAndPrune() {
 	// Delete expired attachments
 	if s.fileCache != nil {
 		ids, err := s.messageCache.AttachmentsExpired()
-		if err == nil {
+		if err != nil {
+			log.Warn("Error retrieving expired attachments: %s", err.Error())
+		} else if len(ids) > 0 {
+			log.Debug("Deleting expired attachments: %v", ids)
 			if err := s.fileCache.Remove(ids...); err != nil {
 				log.Warn("Error deleting attachments: %s", err.Error())
 			}
 		} else {
-			log.Warn("Error retrieving expired attachments: %s", err.Error())
+			log.Debug("No expired attachments to delete")
 		}
 	}
 
 	// Prune message cache
 	olderThan := time.Now().Add(-1 * s.config.CacheDuration)
+	log.Debug("Pruning messages older tha %v", olderThan)
 	if err := s.messageCache.Prune(olderThan); err != nil {
 		log.Warn("Error pruning cache: %s", err.Error())
 	}
@@ -1079,6 +1099,7 @@ func (s *Server) runManager() {
 	for {
 		select {
 		case <-time.After(s.config.ManagerInterval):
+			log.Debug("Running manager")
 			s.updateStatsAndPrune()
 		case <-s.closeChan:
 			return
@@ -1124,7 +1145,7 @@ func (s *Server) sendDelayedMessages() error {
 	for _, m := range messages {
 		v := s.visitorFromIP(m.Sender)
 		if err := s.sendDelayedMessage(v, m); err != nil {
-			log.Warn("error sending delayed message: %s", err.Error())
+			log.Warn("%s Error sending delayed message: %s", logPrefix(v, m), err.Error())
 		}
 	}
 	return nil
@@ -1133,12 +1154,13 @@ func (s *Server) sendDelayedMessages() error {
 func (s *Server) sendDelayedMessage(v *visitor, m *message) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
+	log.Debug("%s Sending delayed message", logPrefix(v, m))
 	t, ok := s.topics[m.Topic] // If no subscribers, just mark message as published
 	if ok {
 		go func() {
 			// We do not rate-limit messages here, since we've rate limited them in the PUT/POST handler
 			if err := t.Publish(v, m); err != nil {
-				log.Warn("unable to publish message %s to topic %s: %v", m.ID, m.Topic, err.Error())
+				log.Warn("%s Unable to publish message: %v", logPrefix(v, m), err.Error())
 			}
 		}()
 	}
@@ -1311,3 +1333,7 @@ func (s *Server) visitorFromIP(ip string) *visitor {
 	v.Keepalive()
 	return v
 }
+
+func logPrefix(v *visitor, m *message) string {
+	return fmt.Sprintf("%s/%s/%s", v.ip, m.Topic, m.ID)
+}

server/server.yml

@@ -178,3 +178,8 @@
 #
 # visitor-attachment-total-size-limit: "100M"
 # visitor-attachment-daily-bandwidth-limit: "500M"
+
+# Log level, can be DEBUG, INFO, WARN or ERROR
+# This option can be hot-reloaded by calling "kill -HUP $pid" or "systemctl reload ntfy".
+#
+# log-level: INFO

server/topic.go

@@ -1,7 +1,7 @@
 package server
 
 import (
-	"log"
+	"heckel.io/ntfy/log"
 	"math/rand"
 	"sync"
 )
@@ -46,10 +46,15 @@ func (t *topic) Publish(v *visitor, m *message) error {
 	go func() {
 		t.mu.Lock()
 		defer t.mu.Unlock()
-		for _, s := range t.subscribers {
-			if err := s(v, m); err != nil {
-				log.Printf("error publishing message to subscriber")
+		if len(t.subscribers) > 0 {
+			log.Debug("%s Forwarding to %d subscriber(s)", logPrefix(v, m), len(t.subscribers))
+			for _, s := range t.subscribers {
+				if err := s(v, m); err != nil {
+					log.Warn("%s Error forwarding to subscriber", logPrefix(v, m))
+				}
 			}
+		} else {
+			log.Debug("%s No subscribers, not forwarding", logPrefix(v, m))
 		}
 	}()
 	return nil