fix: 修复应用日志异常膨胀

internal/apps/flared/frpc/manager.go

@@ -95,12 +95,13 @@ func (m *Manager) GetCurrentConfigChecksum() string {
 }
 
 // UpdateConfig reconciles running frpc processes with the latest tunnel configuration.
-func (m *Manager) UpdateConfig(ctx context.Context, newConfig *service.FlaredTunnelConfigResponse) error {
+// The returned bool indicates whether the active config version or checksum changed.
+func (m *Manager) UpdateConfig(ctx context.Context, newConfig *service.FlaredTunnelConfigResponse) (bool, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
 	if newConfig == nil {
-		return nil
+		return false, nil
 	}
 
 	versionChanged := newConfig.Version != m.currentVersion || newConfig.Checksum != m.currentChecksum
@@ -111,7 +112,7 @@ func (m *Manager) UpdateConfig(ctx context.Context, newConfig *service.FlaredTun
 	}
 
 	if err := os.MkdirAll(m.cfg.DataDir, dataDirPerm); err != nil {
-		return fmt.Errorf("create data dir failed: %w", err)
+		return false, fmt.Errorf("create data dir failed: %w", err)
 	}
 
 	activeRelays := make(map[string]struct{})
@@ -155,9 +156,9 @@ func (m *Manager) UpdateConfig(ctx context.Context, newConfig *service.FlaredTun
 	if versionChanged {
 		m.currentVersion = newConfig.Version
 		m.currentChecksum = newConfig.Checksum
-		return m.saveState()
+		return true, m.saveState()
 	}
-	return nil
+	return false, nil
 }
 
 func (m *Manager) restartProcess(ctx context.Context, relayID string, configPath string) {

internal/apps/flared/frpc/manager_test.go

@@ -119,7 +119,7 @@ func TestStartProcessSuccess(t *testing.T) {
 		Proxies: nil,
 	}
 
-	err := m.UpdateConfig(context.Background(), newConfig)
+	_, err := m.UpdateConfig(context.Background(), newConfig)
 	if err != nil {
 		t.Fatalf("failed to UpdateConfig: %v", err)
 	}
@@ -160,7 +160,7 @@ func TestStartProcessFailureAndBackoff(t *testing.T) {
 		Proxies: nil,
 	}
 
-	_ = m.UpdateConfig(context.Background(), newConfig)
+	_, _ = m.UpdateConfig(context.Background(), newConfig)
 
 	assertStatusEventually(t, m, "relay-1", "error", 4*time.Second)
 
@@ -208,7 +208,7 @@ func TestUnexpectedExit0CPUProtection(t *testing.T) {
 		Proxies: nil,
 	}
 
-	_ = m.UpdateConfig(context.Background(), newConfig)
+	_, _ = m.UpdateConfig(context.Background(), newConfig)
 
 	assertStatusEventually(t, m, "relay-1", "stopped", 4*time.Second)
 
@@ -249,7 +249,7 @@ func TestBackoffReset(t *testing.T) {
 		Proxies: nil,
 	}
 
-	_ = m.UpdateConfig(context.Background(), newConfig)
+	_, _ = m.UpdateConfig(context.Background(), newConfig)
 
 	// Wait to crash
 	assertStatusEventually(t, m, "relay-1", "error", 4*time.Second)
@@ -323,7 +323,7 @@ func TestUpdateConfigKillsOrphanProcessBeforeRestart(t *testing.T) {
 		},
 	}
 
-	if err := m.UpdateConfig(context.Background(), newConfig); err != nil {
+	if _, err := m.UpdateConfig(context.Background(), newConfig); err != nil {
 		t.Fatalf("failed to UpdateConfig: %v", err)
 	}
 
@@ -361,7 +361,7 @@ func TestStopCancelsRunningProcesses(t *testing.T) {
 		},
 	}
 
-	if err := m.UpdateConfig(context.Background(), newConfig); err != nil {
+	if _, err := m.UpdateConfig(context.Background(), newConfig); err != nil {
 		t.Fatalf("failed to UpdateConfig: %v", err)
 	}
 

internal/apps/flared/sync/service.go

@@ -68,19 +68,24 @@ func (s *Service) doSync(ctx context.Context) {
 
 	// 不在 sync 层做版本早退，由 frpcManager.UpdateConfig 负责判断。
 	// 原因：重启后进程全部消失，即使版本/checksum 未变，仍需重新拉起 frpc 进程。
-	err = s.frpcManager.UpdateConfig(ctx, configResp)
-
-	result := "success"
-	message := "apply success"
+	configChanged, err := s.frpcManager.UpdateConfig(ctx, configResp)
 	if err != nil {
-		result = "failed"
-		message = err.Error()
 		slog.Error("failed to apply tunnel config", "error", err)
-	} else {
-		slog.Info("tunnel config applied successfully", "version", configResp.Version)
+		s.reportApplyLog(ctx, configResp, "failed", err.Error())
+		return
 	}
+	if configChanged {
+		slog.Info("tunnel config applied successfully", "version", configResp.Version)
+		s.reportApplyLog(ctx, configResp, "success", "apply success")
+		return
+	}
+	slog.Debug("tunnel config unchanged, skipping apply log report", "version", configResp.Version)
+}
 
-	// Report apply log
+func (s *Service) reportApplyLog(ctx context.Context, configResp *service.FlaredTunnelConfigResponse, result string, message string) {
+	if configResp == nil {
+		return
+	}
 	logPayload := service.ApplyLogPayload{
 		Version:  configResp.Version,
 		Result:   result,