make gateway aware of config.json change

cmd/picoclaw/internal/gateway/helpers.go

@@ -3,12 +3,14 @@ package gateway
 import (
 	"context"
 	"fmt"
-	"log"
 	"os"
 	"os/signal"
 	"path/filepath"
+	"sync"
 	"time"
 
+	"github.com/fsnotify/fsnotify"
+
 	"github.com/sipeed/picoclaw/cmd/picoclaw/internal"
 	"github.com/sipeed/picoclaw/pkg/agent"
 	"github.com/sipeed/picoclaw/pkg/bus"
@@ -45,6 +47,7 @@ func gatewayCmd(debug bool) error {
 		fmt.Println("🔍 Debug mode enabled")
 	}
 
+	configPath := internal.GetConfigPath()
 	cfg, err := internal.LoadConfig()
 	if err != nil {
 		return fmt.Errorf("error loading config: %w", err)
@@ -190,31 +193,167 @@ func gatewayCmd(debug bool) error {
 
 	go agentLoop.Run(ctx)
 
+	// Setup config file watcher for hot reload
+	configWatcher, configReloadChan, watchErr := setupConfigWatcher(configPath, debug)
+	if watchErr != nil {
+		logger.Errorf("⚠ Warning: Could not start config file watcher: %v", watchErr)
+		logger.Warn("  Config changes will require manual restart")
+	} else {
+		logger.Info("✓ Config file watcher started (auto-reload on change)")
+		defer configWatcher.Close()
+	}
+
 	sigChan := make(chan os.Signal, 1)
 	signal.Notify(sigChan, os.Interrupt)
-	<-sigChan
 
-	fmt.Println("\nShutting down...")
-	if cp, ok := provider.(providers.StatefulProvider); ok {
-		cp.Close()
+	// Main event loop - wait for signals or config changes
+	for {
+		select {
+		case <-sigChan:
+			logger.Info("Shutting down...")
+			if cp, ok := provider.(providers.StatefulProvider); ok {
+				cp.Close()
+			}
+			cancel()
+			msgBus.Close()
+
+			// Use a fresh context with timeout for graceful shutdown,
+			// since the original ctx is already canceled.
+			shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 15*time.Second)
+			defer shutdownCancel()
+
+			channelManager.StopAll(shutdownCtx)
+			deviceService.Stop()
+			heartbeatService.Stop()
+			cronService.Stop()
+			mediaStore.Stop()
+			agentLoop.Stop()
+			logger.Info("✓ Gateway stopped")
+
+			return nil
+
+		case newCfg := <-configReloadChan:
+			logger.Info("🔄 Config file changed, reloading...")
+
+			newModel := newCfg.Agents.Defaults.ModelName
+			if newModel == "" {
+				newModel = newCfg.Agents.Defaults.Model
+			}
+
+			logger.Infof(" New model is '%s', recreating provider...", newModel)
+			if cp, ok := provider.(providers.StatefulProvider); ok {
+				cp.Close()
+			}
+
+			// Create new provider from updated config
+			// This will use the correct API key and settings from newCfg.ModelList
+			newProvider, newModelID, err := providers.CreateProvider(newCfg)
+			if err != nil {
+				logger.Errorf("  ⚠ Error creating new provider: %v", err)
+				logger.Warn("  Continuing with old provider")
+				continue
+			}
+
+			provider = newProvider
+			if newModelID != "" {
+				newCfg.Agents.Defaults.ModelName = newModelID
+			}
+
+			// Update agent loop provider and models
+			agentLoop.SetProvider(provider, newCfg)
+
+			logger.Info("  ✓ Provider and agents updated successfully")
+
+			// Update the config reference for other operations
+			// Note: Some changes (like channel configs) may require restart to take full effect
+			cfg = newCfg
+			logger.Info("  ✓ Configuration reloaded successfully")
+		}
 	}
-	cancel()
-	msgBus.Close()
+}
 
-	// Use a fresh context with timeout for graceful shutdown,
-	// since the original ctx is already canceled.
-	shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 15*time.Second)
-	defer shutdownCancel()
+// setupConfigWatcher sets up a file watcher for the config file
+// Returns the watcher, a channel for config updates, and any error
+func setupConfigWatcher(configPath string, debug bool) (*fsnotify.Watcher, chan *config.Config, error) {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		return nil, nil, err
+	}
 
-	channelManager.StopAll(shutdownCtx)
-	deviceService.Stop()
-	heartbeatService.Stop()
-	cronService.Stop()
-	mediaStore.Stop()
-	agentLoop.Stop()
-	fmt.Println("✓ Gateway stopped")
+	configDir := filepath.Dir(configPath)
+	if err := watcher.Add(configDir); err != nil {
+		watcher.Close()
+		return nil, nil, err
+	}
 
-	return nil
+	configChan := make(chan *config.Config, 1)
+	var mu sync.Mutex
+	var debounceTimer *time.Timer
+
+	go func() {
+		for {
+			select {
+			case event, ok := <-watcher.Events:
+				if !ok {
+					return
+				}
+
+				// Only process config.json changes
+				if event.Name != configPath {
+					continue
+				}
+
+				// Debounce rapid file changes (some editors write multiple times)
+				mu.Lock()
+				if debounceTimer != nil {
+					debounceTimer.Stop()
+				}
+
+				debounceTimer = time.AfterFunc(500*time.Millisecond, func() {
+					mu.Unlock()
+
+					if debug {
+						logger.DebugSF("  🔍 Config file event: %v", event)
+					}
+
+					// Validate and load new config
+					newCfg, err := config.LoadConfig(configPath)
+					if err != nil {
+						logger.Errorf("  ⚠ Error loading new config: %v", err)
+						logger.Warn("  Using previous valid config")
+						return
+					}
+
+					// Validate the new config
+					if err := newCfg.ValidateModelList(); err != nil {
+						logger.Errorf("  ⚠ New config validation failed: %v", err)
+						logger.Warn("  Using previous valid config")
+						return
+					}
+
+					logger.Info("  ✓ Config file validated and loaded")
+
+					// Send new config to main loop (non-blocking)
+					select {
+					case configChan <- newCfg:
+					default:
+						// Channel full, skip this update
+						logger.Warn("  ⚠ Previous config reload still in progress, skipping")
+					}
+				})
+				mu.Lock() // Keep lock until timer is set
+				mu.Unlock()
+
+			case err, ok := <-watcher.Errors:
+				if !ok {
+					return
+				}
+				logger.Errorf("  ⚠ Config watcher error: %v", err)
+			}
+		}
+	}()
+
+	return watcher, configChan, nil
 }
 
 func setupCronTool(
@@ -233,7 +372,7 @@ func setupCronTool(
 	// Create and register CronTool
 	cronTool, err := tools.NewCronTool(cronService, agentLoop, msgBus, workspace, restrict, execTimeout, cfg)
 	if err != nil {
-		log.Fatalf("Critical error during CronTool initialization: %v", err)
+		logger.Fatalf("Critical error during CronTool initialization: %v", err)
 	}
 
 	agentLoop.RegisterTool(cronTool)

go.mod

@@ -8,9 +8,11 @@ require (
 	github.com/bwmarrin/discordgo v0.29.0
 	github.com/caarlos0/env/v11 v11.3.1
 	github.com/chzyer/readline v1.5.1
+	github.com/fsnotify/fsnotify v1.4.9
 	github.com/gdamore/tcell/v2 v2.13.8
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/websocket v1.5.3
+	github.com/h2non/filetype v1.1.3
 	github.com/larksuite/oapi-sdk-go/v3 v3.5.3
 	github.com/mdp/qrterminal/v3 v3.2.1
 	github.com/modelcontextprotocol/go-sdk v1.3.0
@@ -37,7 +39,6 @@ require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/elliotchance/orderedmap/v3 v3.1.0 // indirect
 	github.com/gdamore/encoding v1.0.1 // indirect
-	github.com/h2non/filetype v1.1.3 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect

go.sum

@@ -49,6 +49,7 @@ github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+m
 github.com/elliotchance/orderedmap/v3 v3.1.0 h1:j4DJ5ObEmMBt/lcwIecKcoRxIQUEnw0L804lXYDt/pg=
 github.com/elliotchance/orderedmap/v3 v3.1.0/go.mod h1:G+Hc2RwaZvJMcS4JpGCOyViCnGeKf0bTYCGTO4uhjSo=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/gdamore/encoding v1.0.1 h1:YzKZckdBL6jVt2Gc+5p82qhrGiqMdG/eNs6Wy0u3Uhw=
 github.com/gdamore/encoding v1.0.1/go.mod h1:0Z0cMFinngz9kS1QfMjCP8TY7em3bZYeeklsSDPivEo=

pkg/agent/loop.go

@@ -337,6 +337,14 @@ func (al *AgentLoop) SetChannelManager(cm *channels.Manager) {
 	al.channelManager = cm
 }
 
+// SetProvider updates the LLM provider for all agents in the registry
+// and updates their model configurations.
+func (al *AgentLoop) SetProvider(provider providers.LLMProvider, cfg *config.Config) {
+	al.cfg = cfg
+	registry := NewAgentRegistry(cfg, provider)
+	al.registry = registry
+}
+
 // SetMediaStore injects a MediaStore for media lifecycle management.
 func (al *AgentLoop) SetMediaStore(s media.MediaStore) {
 	al.mediaStore = s

pkg/logger/logger.go

@@ -168,6 +168,10 @@ func DebugC(component string, message string) {
 	logMessage(DEBUG, component, message, nil)
 }
 
+func DebugSF(message string, ss ...any) {
+	logMessage(DEBUG, "", fmt.Sprintf(message, ss...), nil)
+}
+
 func DebugF(message string, fields map[string]any) {
 	logMessage(DEBUG, "", message, fields)
 }
@@ -188,6 +192,10 @@ func InfoF(message string, fields map[string]any) {
 	logMessage(INFO, "", message, fields)
 }
 
+func Infof(message string, ss ...any) {
+	logMessage(INFO, "", fmt.Sprintf(message, ss...), nil)
+}
+
 func InfoCF(component string, message string, fields map[string]any) {
 	logMessage(INFO, component, message, fields)
 }
@@ -216,6 +224,10 @@ func ErrorC(component string, message string) {
 	logMessage(ERROR, component, message, nil)
 }
 
+func Errorf(message string, ss ...any) {
+	logMessage(ERROR, "", fmt.Sprintf(message, ss...), nil)
+}
+
 func ErrorF(message string, fields map[string]any) {
 	logMessage(ERROR, "", message, fields)
 }
@@ -232,6 +244,10 @@ func FatalC(component string, message string) {
 	logMessage(FATAL, component, message, nil)
 }
 
+func Fatalf(message string, ss ...any) {
+	logMessage(FATAL, "", fmt.Sprintf(message, ss...), nil)
+}
+
 func FatalF(message string, fields map[string]any) {
 	logMessage(FATAL, "", message, fields)
 }