More RWLock. Jeff wins again

cmd/app.go

@@ -28,7 +28,7 @@ var flagsDefault = []cli.Flag{
 }
 
 var (
-	logLevelOverrideRegex = regexp.MustCompile(`(?i)^([^=]+)\s*=\s*(\S+)\s*->\s*(TRACE|DEBUG|INFO|WARN|ERROR)$`)
+	logLevelOverrideRegex = regexp.MustCompile(`(?i)^([^=\s]+)(?:\s*=\s*(\S+))?\s*->\s*(TRACE|DEBUG|INFO|WARN|ERROR)$`)
 )
 
 // New creates a new CLI application
@@ -76,11 +76,15 @@ func initLogFunc(c *cli.Context) error {
 func applyLogLevelOverrides(rawOverrides []string) error {
 	for _, override := range rawOverrides {
 		m := logLevelOverrideRegex.FindStringSubmatch(override)
-		if len(m) != 4 {
+		if len(m) == 4 {
-			return fmt.Errorf(`invalid log level override "%s", must be "field=value -> loglevel", e.g. "user_id=u_123 -> DEBUG"`, override)
-		}
 			field, value, level := m[1], m[2], m[3]
 			log.SetLevelOverride(field, value, log.ToLevel(level))
+		} else if len(m) == 3 {
+			field, level := m[1], m[2]
+			log.SetLevelOverride(field, "", log.ToLevel(level)) // Matches any value
+		} else {
+			return fmt.Errorf(`invalid log level override "%s", must be "field=value -> loglevel", e.g. "user_id=u_123 -> DEBUG"`, override)
+		}
 	}
 	return nil
 }

log/event.go

@@ -206,9 +206,7 @@ func (e *Event) globalLevelWithOverride() Level {
 	for field, override := range ov {
 		value, exists := e.fields[field]
 		if exists {
-			if value == override.value {
+			if override.value == "" || override.value == value || override.value == fmt.Sprintf("%v", value) {
-				return override.level
-			} else if fmt.Sprintf("%v", value) == override.value {
 				return override.level
 			}
 		}

log/log_test.go

@@ -151,6 +151,27 @@ func TestLog_Timing(t *testing.T) {
 	require.Contains(t, out.String(), `{"time":"1970-01-01T00:00:12Z","level":"INFO","message":"A thing that takes a while","time_taken_ms":`)
 }
 
+func TestLog_LevelOverrideAny(t *testing.T) {
+	t.Cleanup(resetState)
+
+	var out bytes.Buffer
+	SetOutput(&out)
+	SetFormat(JSONFormat)
+	SetLevelOverride("this_one", "", DebugLevel)
+	SetLevelOverride("time_taken_ms", "", TraceLevel)
+
+	Time(time.Unix(11, 0).UTC()).Field("this_one", "11").Debug("this is logged")
+	Time(time.Unix(12, 0).UTC()).Field("not_this", "11").Debug("this is not logged")
+	Time(time.Unix(13, 0).UTC()).Field("this_too", "11").Info("this is also logged")
+	Time(time.Unix(14, 0).UTC()).Field("time_taken_ms", 0).Info("this is also logged")
+
+	expected := `{"time":"1970-01-01T00:00:11Z","level":"DEBUG","message":"this is logged","this_one":"11"}
+{"time":"1970-01-01T00:00:13Z","level":"INFO","message":"this is also logged","this_too":"11"}
+{"time":"1970-01-01T00:00:14Z","level":"INFO","message":"this is also logged","time_taken_ms":0}
+`
+	require.Equal(t, expected, out.String())
+}
+
 type fakeError struct {
 	Code    int
 	Message string

server/server.go

@@ -44,6 +44,7 @@ import (
 - MEDIUM: Test new token endpoints & never-expiring token
 - LOW: UI: Flickering upgrade banner when logging in
 - LOW: Menu item -> popup click should not open page
+- LOW: get rid of reservation id, replace with DELETE X-Topic: ...
 
 */
 
@@ -143,8 +144,8 @@ const (
 	tagPublish      = "publish"
 	tagSubscribe    = "subscribe"
 	tagFirebase     = "firebase"
-	tagEmail        = "email" // Send email
 	tagSMTP         = "smtp"  // Receive email
+	tagEmail        = "email" // Send email
 	tagFileCache    = "file_cache"
 	tagMessageCache = "message_cache"
 	tagStripe       = "stripe"
@@ -323,16 +324,30 @@ func (s *Server) closeDatabases() {
 	s.messageCache.Close()
 }
 
+// handle is the main entry point for all HTTP requests
 func (s *Server) handle(w http.ResponseWriter, r *http.Request) {
 	v, err := s.maybeAuthenticate(r) // Note: Always returns v, even when error is returned
-	if err == nil {
-		logvr(v, r).Debug("Dispatching request")
-		if log.IsTrace() {
-			logvr(v, r).Trace("Entire request (headers and body):\n%s", renderHTTPRequest(r))
-		}
-		err = s.handleInternal(w, r, v)
-	}
 	if err != nil {
+		s.handleError(w, r, v, err)
+		return
+	}
+
+	if log.IsTrace() {
+		logvr(v, r).Field("http_request", renderHTTPRequest(r)).Trace("HTTP request started")
+	} else if log.IsDebug() {
+		logvr(v, r).Debug("HTTP request started")
+	}
+	logvr(v, r).
+		Timing(func() {
+			if err := s.handleInternal(w, r, v); err != nil {
+				s.handleError(w, r, v, err)
+				return
+			}
+		}).
+		Debug("HTTP request finished")
+}
+
+func (s *Server) handleError(w http.ResponseWriter, r *http.Request, v *visitor, err error) {
 	if websocket.IsWebSocketUpgrade(r) {
 		isNormalError := strings.Contains(err.Error(), "i/o timeout")
 		if isNormalError {
@@ -365,7 +380,6 @@ func (s *Server) handle(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(httpErr.HTTPCode)
 	io.WriteString(w, httpErr.JSON()+"\n")
 }
-}
 
 func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request, v *visitor) error {
 	if r.Method == http.MethodGet && r.URL.Path == "/" {

server/server.yml

@@ -257,7 +257,9 @@
 #   Be aware that "debug" (and particularly "trace") can be VERY CHATTY. Only turn them on briefly for debugging purposes.
 # - log-level-overrides lets you override the log level if certain fields match. This is incredibly powerful
 #   for debugging certain parts of the system (e.g. only the account management, or only a certain visitor).
-#   This is an array of strings in the format "field=value -> level", e.g. "tag=manager -> trace".
+#   This is an array of strings in the format:
+#      - "field=value -> level" to match a value exactly, e.g. "tag=manager -> trace"
+#      - "field -> level" to match any value, e.g. "time_taken_ms -> debug"
 #   Warning: Using log-level-overrides has a performance penalty. Only use it for temporary debugging.
 #
 # Example (good for production):
@@ -269,6 +271,7 @@
 #   log-level-overrides:
 #      - "tag=manager -> trace"
 #      - "visitor_ip=1.2.3.4 -> debug"
+#      - "time_taken_ms -> debug"
 #
 # log-level: info
 # log-level-overrides:

server/visitor.go

@@ -62,7 +62,7 @@ type visitor struct {
 	authLimiter         *rate.Limiter      // Limiter for incorrect login attempts, may be nil
 	firebase            time.Time          // Next allowed Firebase message
 	seen                time.Time          // Last seen time of this visitor (needed for removal of stale visitors)
-	mu                  sync.Mutex
+	mu                  sync.RWMutex
 }
 
 type visitorInfo struct {
@@ -133,8 +133,8 @@ func newVisitor(conf *Config, messageCache *messageCache, userManager *user.Mana
 }
 
 func (v *visitor) Context() log.Context {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.contextNoLock()
 }
 
@@ -184,14 +184,14 @@ func visitorExtendedInfoContext(info *visitorInfo) log.Context {
 
 }
 func (v *visitor) RequestAllowed() bool {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.requestLimiter.Allow()
 }
 
 func (v *visitor) FirebaseAllowed() bool {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return !time.Now().Before(v.firebase)
 }
 
@@ -202,27 +202,27 @@ func (v *visitor) FirebaseTemporarilyDeny() {
 }
 
 func (v *visitor) MessageAllowed() bool {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.messagesLimiter.Allow()
 }
 
 func (v *visitor) EmailAllowed() bool {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.emailsLimiter.Allow()
 }
 
 func (v *visitor) SubscriptionAllowed() bool {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.subscriptionLimiter.Allow()
 }
 
 // AuthAllowed returns true if an auth request can be attempted (> 1 token available)
 func (v *visitor) AuthAllowed() bool {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	if v.authLimiter == nil {
 		return true
 	}
@@ -231,8 +231,8 @@ func (v *visitor) AuthAllowed() bool {
 
 // AuthFailed records an auth failure
 func (v *visitor) AuthFailed() {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	if v.authLimiter != nil {
 		v.authLimiter.Allow()
 	}
@@ -240,8 +240,8 @@ func (v *visitor) AuthFailed() {
 
 // AccountCreationAllowed returns true if a new account can be created
 func (v *visitor) AccountCreationAllowed() bool {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	if v.accountLimiter == nil || (v.accountLimiter != nil && v.accountLimiter.Tokens() < 1) {
 		return false
 	}
@@ -250,22 +250,22 @@ func (v *visitor) AccountCreationAllowed() bool {
 
 // AccountCreated decreases the account limiter. This is to be called after an account was created.
 func (v *visitor) AccountCreated() {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	if v.accountLimiter != nil {
 		v.accountLimiter.Allow()
 	}
 }
 
 func (v *visitor) BandwidthAllowed(bytes int64) bool {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.bandwidthLimiter.AllowN(bytes)
 }
 
 func (v *visitor) RemoveSubscription() {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	v.subscriptionLimiter.AllowN(-1)
 }
 
@@ -276,20 +276,20 @@ func (v *visitor) Keepalive() {
 }
 
 func (v *visitor) BandwidthLimiter() util.Limiter {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.bandwidthLimiter
 }
 
 func (v *visitor) Stale() bool {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return time.Since(v.seen) > visitorExpungeAfter
 }
 
 func (v *visitor) Stats() *user.Stats {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return &user.Stats{
 		Messages: v.messagesLimiter.Value(),
 		Emails:   v.emailsLimiter.Value(),
@@ -297,30 +297,30 @@ func (v *visitor) Stats() *user.Stats {
 }
 
 func (v *visitor) ResetStats() {
-	v.mu.Lock() // limiters could be replaced!
+	v.mu.RLock() // limiters could be replaced!
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	v.emailsLimiter.Reset()
 	v.messagesLimiter.Reset()
 }
 
 // User returns the visitor user, or nil if there is none
 func (v *visitor) User() *user.User {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.user // May be nil
 }
 
 // IP returns the visitor IP address
 func (v *visitor) IP() netip.Addr {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.ip
 }
 
 // Authenticated returns true if a user successfully authenticated
 func (v *visitor) Authenticated() bool {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.user != nil
 }
 
@@ -338,8 +338,8 @@ func (v *visitor) SetUser(u *user.User) {
 // MaybeUserID returns the user ID of the visitor (if any). If this is an anonymous visitor,
 // an empty string is returned.
 func (v *visitor) MaybeUserID() string {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	if v.user != nil {
 		return v.user.ID
 	}
@@ -369,8 +369,8 @@ func (v *visitor) resetLimitersNoLock(messages, emails int64, enqueueUpdate bool
 }
 
 func (v *visitor) Limits() *visitorLimits {
-	v.mu.Lock()
+	v.mu.RLock()
-	defer v.mu.Unlock()
+	defer v.mu.RUnlock()
 	return v.limitsNoLock()
 }
 
@@ -422,9 +422,9 @@ func configBasedVisitorLimits(conf *Config) *visitorLimits {
 }
 
 func (v *visitor) Info() (*visitorInfo, error) {
-	v.mu.Lock()
+	v.mu.RLock()
 	info := v.infoLightNoLock()
-	v.mu.Unlock()
+	v.mu.RUnlock()
 
 	// Attachment stats from database
 	var attachmentsBytesUsed int64