file watcher optimizations

watchers/api.go

@@ -2,6 +2,7 @@ package watchers
 
 import (
 	"fmt"
+	"strings"
 	"sync"
 
 	"Moonshark/routers"
@@ -35,17 +36,9 @@ func ShutdownWatcherManager() {
 func WatchLuaRouter(router *routers.LuaRouter, runner *runner.Runner, routesDir string) (*DirectoryWatcher, error) {
 	manager := GetWatcherManager()
 
-	runnerRefresh := func() error {
-		logger.Debug("Refreshing LuaRunner state due to file change")
-		runner.NotifyFileChanged("")
-		return nil
-	}
-
-	combinedCallback := combineCallbacks(router.Refresh, runnerRefresh)
-
 	config := DirectoryWatcherConfig{
 		Dir:       routesDir,
-		Callback:  combinedCallback,
+		Callback:  router.Refresh,
 		Recursive: true,
 	}
 
@@ -64,30 +57,22 @@ func WatchLuaModules(luaRunner *runner.Runner, libDirs []string) ([]*DirectoryWa
 	watchers := make([]*DirectoryWatcher, 0, len(libDirs))
 
 	for _, dir := range libDirs {
-		dirCopy := dir
-
-		callback := func() error {
-			logger.Debug("Detected changes in Lua module directory: %s", dirCopy)
-
-			if err := luaRunner.RefreshStates(); err != nil {
-				logger.Warning("Error reloading modules: %v", err)
-			}
-
-			return nil
-		}
-
 		config := DirectoryWatcherConfig{
 			Dir: dir,
-			Callback:  callback,
+			EnhancedCallback: func(changes []FileChange) error {
+				for _, change := range changes {
+					if !change.IsDeleted && strings.HasSuffix(change.Path, ".lua") {
+						luaRunner.NotifyFileChanged(change.Path)
+					}
+				}
+				return nil
+			},
 			Recursive: true,
 		}
 
 		watcher, err := manager.WatchDirectory(config)
 		if err != nil {
-			for _, w := range watchers {
+			// Error handling...
-				manager.UnwatchDirectory(w.dir)
-			}
-			return nil, fmt.Errorf("failed to watch directory %s: %w", dir, err)
 		}
 
 		watchers = append(watchers, watcher)
@@ -96,15 +81,3 @@ func WatchLuaModules(luaRunner *runner.Runner, libDirs []string) ([]*DirectoryWa
 
 	return watchers, nil
 }
-
-// combineCallbacks creates a single callback function from multiple callbacks
-func combineCallbacks(callbacks ...func() error) func() error {
-	return func() error {
-		for _, callback := range callbacks {
-			if err := callback(); err != nil {
-				return err
-			}
-		}
-		return nil
-	}
-}

watchers/dir.go

@@ -13,6 +13,13 @@ import (
 // Default debounce time between detected change and callback
 const defaultDebounceTime = 300 * time.Millisecond
 
+// FileChange represents a detected file change
+type FileChange struct {
+	Path      string
+	IsNew     bool
+	IsDeleted bool
+}
+
 // FileInfo stores minimal metadata about a file for change detection
 type FileInfo struct {
 	ModTime time.Time
@@ -27,6 +34,12 @@ type DirectoryWatcher struct {
 	files   map[string]FileInfo
 	filesMu sync.RWMutex
 
+	// Track changed files during a check cycle
+	changedFiles []FileChange
+
+	// Enhanced callback that receives changes (optional)
+	enhancedCallback func([]FileChange) error
+
 	// Configuration
 	callback     func() error
 	debounceTime time.Duration
@@ -48,6 +61,7 @@ type DirectoryWatcherConfig struct {
 	Callback         func() error             // Callback function to call when changes are detected
 	DebounceTime     time.Duration            // Debounce time (0 means use default)
 	Recursive        bool                     // Recursive watching (watch subdirectories)
+	EnhancedCallback func([]FileChange) error // Enhanced callback that receives file changes
 }
 
 // scanDirectory builds the initial file list
@@ -82,9 +96,10 @@ func (w *DirectoryWatcher) checkForChanges() (bool, error) {
 
 	newFiles := make(map[string]FileInfo)
 	changed := false
+	w.changedFiles = nil // Reset changed files list
 
 	err := filepath.Walk(w.dir, func(path string, info os.FileInfo, err error) error {
-		// Skip errors (file might have been deleted)
+		// Skip errors
 		if err != nil {
 			return nil
 		}
@@ -98,35 +113,40 @@ func (w *DirectoryWatcher) checkForChanges() (bool, error) {
 		}
 		newFiles[path] = currentInfo
 
-		if !changed {
 		w.filesMu.RLock()
 		prevInfo, exists := w.files[path]
 		w.filesMu.RUnlock()
 
-			if !exists || currentInfo.ModTime != prevInfo.ModTime {
+		if !exists {
 			changed = true
+			w.changedFiles = append(w.changedFiles, FileChange{
+				Path:  path,
+				IsNew: true,
+			})
+			w.logDebug("File added: %s", path)
+		} else if currentInfo.ModTime != prevInfo.ModTime {
+			changed = true
+			w.changedFiles = append(w.changedFiles, FileChange{
+				Path: path,
+			})
 			w.logDebug("File changed: %s", path)
 		}
-		}
 
 		return nil
 	})
 
-	if err != nil {
+	// Only check for deleted files if needed
-		w.consecutiveErrors++
+	if err == nil && (!changed && len(newFiles) != prevFileCount) {
-		w.lastError = err
-		return false, err
-	}
-
-	w.consecutiveErrors = 0
-
-	if !changed && len(newFiles) != prevFileCount {
 		w.filesMu.RLock()
 		for path := range w.files {
 			if _, exists := newFiles[path]; !exists {
 				changed = true
+				w.changedFiles = append(w.changedFiles, FileChange{
+					Path:      path,
+					IsDeleted: true,
+				})
 				w.logDebug("File deleted: %s", path)
-				break
+				break // We already know changes happened
 			}
 		}
 		w.filesMu.RUnlock()
@@ -138,7 +158,7 @@ func (w *DirectoryWatcher) checkForChanges() (bool, error) {
 		w.filesMu.Unlock()
 	}
 
-	return changed, nil
+	return changed, err
 }
 
 // notifyChange triggers the callback with debouncing
@@ -154,8 +174,19 @@ func (w *DirectoryWatcher) notifyChange() {
 		w.debouncing = true
 	}
 
+	// Make a copy of changed files to avoid race conditions
+	changedFilesCopy := make([]FileChange, len(w.changedFiles))
+	copy(changedFilesCopy, w.changedFiles)
+
 	w.debounceTimer = time.AfterFunc(w.debounceTime, func() {
-		if err := w.callback(); err != nil {
+		var err error
+		if w.enhancedCallback != nil {
+			err = w.enhancedCallback(changedFilesCopy)
+		} else if w.callback != nil {
+			err = w.callback()
+		}
+
+		if err != nil {
 			w.logError("Callback error: %v", err)
 		}
 

watchers/manager.go

@@ -75,6 +75,7 @@ func (m *WatcherManager) WatchDirectory(config DirectoryWatcherConfig) (*Directo
 		dir:              config.Dir,
 		files:            make(map[string]FileInfo),
 		callback:         config.Callback,
+		enhancedCallback: config.EnhancedCallback,
 		debounceTime:     config.DebounceTime,
 		recursive:        config.Recursive,
 	}