Notice configuration changes and restart the watchers.

config/config.go

@@ -38,7 +38,8 @@ type ConfigV2 struct {
 }
 
 type ConfigService struct {
-	Config         ConfigV2
+	Config         *ConfigV2
+	Changed        chan bool
 	ConfigFilename string
 }
 
@@ -57,7 +58,7 @@ func (c *ConfigService) LoadOrInit() error {
 	if os.IsNotExist(err) {
 		daulog.SendLog("NOTE: No config file, writing out sample configuration", daulog.LogTypeInfo)
 		daulog.SendLog("You need to set the configuration via the web interface", daulog.LogTypeInfo)
-		c.Config = *DefaultConfig()
+		c.Config = DefaultConfig()
 		return c.Save()
 	} else {
 		return c.Load()
@@ -158,6 +159,7 @@ func (c *ConfigService) Save() error {
 	if err != nil {
 		return fmt.Errorf("cannot save config %s: %s", c.ConfigFilename, err.Error())
 	}
+
 	return nil
 }
 

dau.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"flag"
 	"fmt"
@@ -39,8 +40,10 @@ func main() {
 
 	parseOptions()
 
-	// grab the config
+	// grab the config, register to notice changes
 	config := config.DefaultConfigService()
+	configChanged := make(chan bool)
+	config.Changed = configChanged
 	config.LoadOrInit()
 
 	// create the uploader
@@ -48,26 +51,41 @@ func main() {
 
 	// log.Print("Opening web browser")
 	// open.Start("http://localhost:9090")
-	web := web.WebService{Config: *config}
+	web := web.WebService{Config: config}
 	web.StartWebServer()
 
 	go func() { checkUpdates() }()
 
-	// create the watchers
+	// create the watchers, restart them if config changes
+	// blocks forever
+	startWatchers(config, &up, configChanged)
 
-	log.Printf("Conf: %#v", config.Config)
-
-	for _, c := range config.Config.Watchers {
-		log.Printf("Creating watcher for %v", c)
-		watcher := watch{uploader: up, lastCheck: time.Now(), newLastCheck: time.Now(), config: c}
-		go watcher.Watch(config.Config.WatchInterval)
-	}
-
-	select {}
 }
 
-func (w *watch) Watch(interval int) {
+func startWatchers(config *config.ConfigService, up *upload.Uploader, configChange chan bool) {
 	for {
+		log.Printf("Creating watchers")
+		ctx, cancel := context.WithCancel(context.Background())
+		for _, c := range config.Config.Watchers {
+			log.Printf("Creating watcher for %s interval %d", c.Path, config.Config.WatchInterval)
+			watcher := watch{uploader: *up, lastCheck: time.Now(), newLastCheck: time.Now(), config: c}
+			go watcher.Watch(config.Config.WatchInterval, ctx)
+		}
+		// wait for single that the config changed
+		<-configChange
+		cancel()
+		log.Printf("starting new watchers due to config change")
+	}
+
+}
+
+func (w *watch) Watch(interval int, ctx context.Context) {
+	for {
+		select {
+		case <-ctx.Done():
+			log.Printf("Killing old watcher")
+			return
+		default:
 			newFiles := w.ProcessNewFiles()
 			for _, f := range newFiles {
 				w.uploader.AddFile(f, w.config)
@@ -77,6 +95,7 @@ func (w *watch) Watch(interval int) {
 			daulog.SendLog(fmt.Sprintf("sleeping for %ds before next check of %s", interval, w.config.Path), daulog.LogTypeDebug)
 			time.Sleep(time.Duration(interval) * time.Second)
 		}
+	}
 }
 
 // ProcessNewFiles returns an array of new files that have appeared since
@@ -119,7 +138,6 @@ func (w *watch) checkPath() bool {
 // If the file is eligible, not excluded and new enough to care we add it
 // to the passed in array of files
 func (w *watch) checkFile(path string, found *[]string, exclusions []string) error {
-	log.Printf("Considering %s", path)
 
 	extension := strings.ToLower(filepath.Ext(path))
 

web/server.go

@@ -18,7 +18,7 @@ import (
 )
 
 type WebService struct {
-	Config config.ConfigService
+	Config *config.ConfigService
 }
 
 //go:embed data
@@ -129,7 +129,7 @@ func (ws *WebService) handleConfig(w http.ResponseWriter, r *http.Request) {
 			w.Write(j)
 			return
 		}
-		ws.Config.Config = newConfig
+		ws.Config.Config = &newConfig
 		err = ws.Config.Save()
 		if err != nil {
 			w.WriteHeader(400)
@@ -138,6 +138,11 @@ func (ws *WebService) handleConfig(w http.ResponseWriter, r *http.Request) {
 
 			return
 		}
+		// config has changed, so tell the world
+		if ws.Config.Changed != nil {
+			ws.Config.Changed <- true
+		}
+
 	}
 
 	b, _ := json.Marshal(ws.Config.Config)