fix: high cpu usage

internal/net/http/accesslog/access_logger.go

@@ -19,8 +19,8 @@ type (
 		io   AccessLogIO
 
 		buf     bytes.Buffer // buffer for non-flushed log
-		bufMu   sync.Mutex   // protect buf
-		bufPool sync.Pool    // buffer pool for formatting a single log line
+		bufMu   sync.RWMutex
+		bufPool sync.Pool // buffer pool for formatting a single log line
 
 		flushThreshold int
 
@@ -123,10 +123,10 @@ func (l *AccessLogger) Flush(force bool) {
 		return
 	}
 	if force || l.buf.Len() >= l.flushThreshold {
-		l.bufMu.Lock()
+		l.bufMu.RLock()
 		l.write(l.buf.Bytes())
 		l.buf.Reset()
-		l.bufMu.Unlock()
+		l.bufMu.RUnlock()
 	}
 }
 

internal/net/http/middleware/errorpage/error_page.go

@@ -19,19 +19,12 @@ import (
 const errPagesBasePath = common.ErrorPagesBasePath
 
 var (
-	setupMu        sync.Mutex
+	setupOnce      sync.Once
 	dirWatcher     W.Watcher
 	fileContentMap = F.NewMapOf[string, []byte]()
 )
 
 func setup() {
-	setupMu.Lock()
-	defer setupMu.Unlock()
-
-	if dirWatcher != nil {
-		return
-	}
-
 	t := task.RootTask("error_page", false)
 	dirWatcher = W.NewDirectoryWatcher(t, errPagesBasePath)
 	loadContent()
@@ -39,7 +32,7 @@ func setup() {
 }
 
 func GetStaticFile(filename string) ([]byte, bool) {
-	setup()
+	setupOnce.Do(setup)
 	return fileContentMap.Load(filename)
 }
 

internal/net/http/middleware/rate_limit.go

@@ -49,8 +49,6 @@ func (rl *rateLimiter) newLimiter() *rate.Limiter {
 }
 
 func (rl *rateLimiter) limit(w http.ResponseWriter, r *http.Request) bool {
-	rl.mu.Lock()
-
 	host, _, err := net.SplitHostPort(r.RemoteAddr)
 	if err != nil {
 		rl.AddTracef("unable to parse remote address %s", r.RemoteAddr)
@@ -58,12 +56,12 @@ func (rl *rateLimiter) limit(w http.ResponseWriter, r *http.Request) bool {
 		return false
 	}
 
+	rl.mu.Lock()
 	limiter, ok := rl.requestMap[host]
 	if !ok {
 		limiter = rl.newLimiter()
 		rl.requestMap[host] = limiter
 	}
-
 	rl.mu.Unlock()
 
 	if limiter.Allow() {