feat: show download progress

core/core.go

@@ -21,17 +21,50 @@ import (
 
 func processPendingTask(task *types.Task) error {
 	logger.L.Debugf("Start processing task: %s", task.String())
-
 	os.MkdirAll(config.Cfg.Temp.BasePath, os.ModePerm)
-
-	logger.L.Debugf("Start downloading file: %s", task.String())
-
 	task.Ctx.(*ext.Context).EditMessage(task.ChatID, &tg.MessagesEditMessageRequest{
-		Message: "开始下载文件...",
+		Message: "正在下载文件...",
 		ID:      task.ReplyMessageID,
 	})
 
-	readCloser, err := NewTelegramReader(task.Ctx, bot.Client, task.File.Location, 0, task.File.FileSize-1, task.File.FileSize)
+	barTotalCount := 5
+	if task.File.FileSize > 1024*1024*200 {
+		barTotalCount = 10
+	} else if task.File.FileSize > 1024*1024*500 {
+		barTotalCount = 20
+	} else if task.File.FileSize > 1024*1024*1000 {
+		barTotalCount = 50
+	}
+
+	readCloser, err := NewTelegramReader(task.Ctx, bot.Client, task.File.Location, 0, task.File.FileSize-1, task.File.FileSize, func(bytesRead, contentLength int64) {
+		progress := float64(bytesRead) / float64(contentLength) * 100
+		logger.L.Tracef("Downloading %s: %.2f%%", task.String(), progress)
+		if task.File.FileSize < 1024*1024*50 {
+			return
+		}
+
+		barSize := 100 / barTotalCount
+		if int(progress)%barSize != 0 {
+			return
+		}
+
+		text := fmt.Sprintf("正在下载文件\n[%s] %.2f%%", func() string {
+			bar := ""
+			for i := 0; i < barTotalCount; i++ {
+				if int(progress)/barSize > i {
+					bar += "█"
+				} else {
+					bar += "░"
+				}
+			}
+			return bar
+		}(), progress)
+		task.Ctx.(*ext.Context).EditMessage(task.ChatID, &tg.MessagesEditMessageRequest{
+			Message: text,
+			ID:      task.ReplyMessageID,
+		})
+	}, task.File.FileSize/100)
+
 	if err != nil {
 		return fmt.Errorf("Failed to create reader: %w", err)
 	}
@@ -41,18 +74,18 @@ func processPendingTask(task *types.Task) error {
 	if err != nil {
 		return fmt.Errorf("Failed to create file: %w", err)
 	}
-	logger.L.Debug("Created file: ", dest.Name())
 	defer dest.Close()
 
 	if _, err := io.CopyN(dest, readCloser, task.File.FileSize); err != nil {
 		return fmt.Errorf("Failed to download file: %w", err)
 	}
+	destName := dest.Name()
 
 	defer func() {
 		if config.Cfg.Temp.CacheTTL > 0 {
-			common.RmFileAfter(dest.Name(), time.Duration(config.Cfg.Temp.CacheTTL)*time.Second)
+			common.RmFileAfter(destName, time.Duration(config.Cfg.Temp.CacheTTL)*time.Second)
 		} else {
-			if err := os.Remove(dest.Name()); err != nil {
+			if err := os.Remove(destName); err != nil {
 				logger.L.Errorf("Failed to purge file: %s", err)
 			}
 		}

core/reader.go

@@ -10,17 +10,20 @@ import (
 )
 
 type telegramReader struct {
-	ctx           context.Context
-	client        *gotgproto.Client
-	location      *tg.InputDocumentFileLocation
-	start         int64
-	end           int64
-	next          func() ([]byte, error)
-	buffer        []byte
-	bytesread     int64
-	chunkSize     int64
-	i             int64
-	contentLength int64
+	client           *gotgproto.Client
+	location         *tg.InputDocumentFileLocation
+	bytesread        int64
+	chunkSize        int64
+	i                int64
+	contentLength    int64
+	start            int64
+	end              int64
+	next             func() ([]byte, error)
+	progressCallback func(bytesRead, contentLength int64)
+	callbackInterval int64
+	lastProgress     int64
+	buffer           []byte
+	ctx              context.Context
 }
 
 func (*telegramReader) Close() error {
@@ -50,6 +53,12 @@ func (r *telegramReader) Read(p []byte) (n int, err error) {
 	n = copy(p, r.buffer[r.i:])
 	r.i += int64(n)
 	r.bytesread += int64(n)
+
+	if r.progressCallback != nil && (r.bytesread-r.lastProgress >= r.callbackInterval || r.bytesread == r.contentLength) {
+		r.progressCallback(r.bytesread, r.contentLength)
+		r.lastProgress = r.bytesread
+	}
+
 	return n, nil
 }
 
@@ -60,16 +69,20 @@ func NewTelegramReader(
 	start int64,
 	end int64,
 	contentLength int64,
+	progressCallback func(bytesRead, contentLength int64),
+	callbackInterval int64,
 ) (io.ReadCloser, error) {
 
 	r := &telegramReader{
-		ctx:           ctx,
-		location:      location,
-		client:        client,
-		start:         start,
-		end:           end,
-		chunkSize:     int64(1024 * 1024),
-		contentLength: contentLength,
+		ctx:              ctx,
+		location:         location,
+		client:           client,
+		start:            start,
+		end:              end,
+		chunkSize:        int64(1024 * 1024),
+		contentLength:    contentLength,
+		progressCallback: progressCallback,
+		callbackInterval: callbackInterval,
 	}
 
 	r.next = r.partStream()