Use inotify fs watcher. Also shorten errors msg for loggers instantiation.

cmd/dwelling-upload/main.go

@@ -5,6 +5,8 @@ import (
 	"dwelling-upload/internal/handlers"
 	"dwelling-upload/pkg/logging"
 	"dwelling-upload/pkg/server"
+	"dwelling-upload/pkg/utils"
+	"dwelling-upload/pkg/watcher"
 	"flag"
 	"log"
 	"net/http"
@@ -56,23 +58,41 @@ func main() {
 
 	logErr, err := logging.NewLogger(config.Log.Error, config.Log.ToStdout)
 	if err != nil {
-		log.Fatalln("failed to open error logger:", err)
+		log.Fatalln("error logger:", err)
 	}
 	defer logErr.Close()
 
 	logUpload, err := logging.NewLogger(config.Log.Upload, config.Log.ToStdout)
 	if err != nil {
-		log.Fatalln("failed to open upload logger:", err)
+		log.Fatalln("upload logger:", err)
 	}
 	defer logUpload.Close()
 
 	logDownload, err := logging.NewLogger(config.Log.Download, config.Log.ToStdout)
 	if err != nil {
-		log.Fatalln("failed to open download logger:", err)
+		log.Fatalln("download logger:", err)
 	}
 	defer logDownload.Close()
 
-	hand := handlers.NewUploadHandlers(config, logErr, logUpload, logDownload)
+	watcha, err := watcher.NewFSWatcher()
+	if err != nil {
+		logErr.Fatalln(err)
+	}
+	defer watcha.Close()
+
+	if err := watcha.AddWatch(config.Uploads.Directory, watcher.CrDelMask); err != nil {
+		logErr.Fatalln(err)
+	}
+
+	uploadDirNotify := make(chan uint32)
+	uploadDirSize, err := utils.DirectorySize(config.Uploads.Directory)
+	if err != nil {
+		logErr.Fatalln(err)
+	}
+
+	watcha.WatchForMask(uploadDirNotify, watcher.CrDelMask)
+
+	hand := handlers.NewUploadHandlers(config, logErr, logUpload, logDownload, &uploadDirSize)
 	srv := server.NewHttpServer()
 
 	srv.SetNotFoundHandler(hand.NotFound)
@@ -88,9 +108,22 @@ func main() {
 	doneSignal := make(chan os.Signal, 1)
 	signal.Notify(doneSignal, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
 
-	<-doneSignal
+	for {
+		select {
+		case <-doneSignal:
+			if err := srv.Stop(); err != nil {
+				logErr.Fatalln(err)
+			}
+		case <-uploadDirNotify:
+			sz, err := utils.DirectorySize(config.Uploads.Directory)
+			if err != nil {
+				logErr.Println(err)
+			}
 
-	if err := srv.Stop(); err != nil {
+			if sz > 0 {
-		logErr.Fatalln(err)
+				uploadDirSize = sz
+			}
+		}
 	}
+
 }