Golang StorageDriver.List方法代码示例

// WalkWithChildrenFilter traverses a filesystem defined within driver,
// starting from the given path, calling f on each file. Given filter will be
// called on a list of directory children before being recursively processed.
func WalkWithChildrenFilter(ctx context.Context, driver storageDriver.StorageDriver, from string, filter WalkChildrenFilter, f WalkFn) error {
	children, err := driver.List(ctx, from)
	if err != nil {
		return err
	}
	filter(children)
	for _, child := range children {
		// TODO(stevvooe): Calling driver.Stat for every entry is quite
		// expensive when running against backends with a slow Stat
		// implementation, such as s3. This is very likely a serious
		// performance bottleneck.
		fileInfo, err := driver.Stat(ctx, child)
		if err != nil {
			return err
		}
		err = f(fileInfo)
		skipDir := (err == ErrSkipDir)
		if err != nil && !skipDir {
			return err
		}

		if fileInfo.IsDir() && !skipDir {
			if err := WalkWithChildrenFilter(ctx, driver, child, filter, f); err != nil {
				return err
			}
		}
	}
	return nil
}

// Walk traverses a filesystem defined within driver, starting
// from the given path, calling f on each file
func Walk(driver storageDriver.StorageDriver, from string, f WalkFn) error {
	children, err := driver.List(from)
	if err != nil {
		return err
	}
	for _, child := range children {
		fileInfo, err := driver.Stat(child)
		if err != nil {
			return err
		}
		err = f(fileInfo)
		skipDir := (err == ErrSkipDir)
		if err != nil && !skipDir {
			return err
		}

		if fileInfo.IsDir() && !skipDir {
			Walk(driver, child, f)
		}
	}
	return nil
}

// handleRequest handles storagedriver.StorageDriver method requests as defined in client.go
// Responds to requests using the Request.ResponseChannel
func handleRequest(driver storagedriver.StorageDriver, request Request) {
	switch request.Type {
	case "Version":
		err := request.ResponseChannel.Send(&VersionResponse{Version: storagedriver.CurrentVersion})
		if err != nil {
			panic(err)
		}
	case "GetContent":
		path, _ := request.Parameters["Path"].(string)
		content, err := driver.GetContent(path)
		var response ReadStreamResponse
		if err != nil {
			response = ReadStreamResponse{Error: WrapError(err)}
		} else {
			response = ReadStreamResponse{Reader: ioutil.NopCloser(bytes.NewReader(content))}
		}
		err = request.ResponseChannel.Send(&response)
		if err != nil {
			panic(err)
		}
	case "PutContent":
		path, _ := request.Parameters["Path"].(string)
		reader, _ := request.Parameters["Reader"].(io.ReadCloser)
		contents, err := ioutil.ReadAll(reader)
		defer reader.Close()
		if err == nil {
			err = driver.PutContent(path, contents)
		}
		response := WriteStreamResponse{
			Error: WrapError(err),
		}
		err = request.ResponseChannel.Send(&response)
		if err != nil {
			panic(err)
		}
	case "ReadStream":
		path, _ := request.Parameters["Path"].(string)
		// Depending on serialization method, Offset may be converted to any int/uint type
		offset := reflect.ValueOf(request.Parameters["Offset"]).Convert(reflect.TypeOf(int64(0))).Int()
		reader, err := driver.ReadStream(path, offset)
		var response ReadStreamResponse
		if err != nil {
			response = ReadStreamResponse{Error: WrapError(err)}
		} else {
			response = ReadStreamResponse{Reader: reader}
		}
		err = request.ResponseChannel.Send(&response)
		if err != nil {
			panic(err)
		}
	case "WriteStream":
		path, _ := request.Parameters["Path"].(string)
		// Depending on serialization method, Offset may be converted to any int/uint type
		offset := reflect.ValueOf(request.Parameters["Offset"]).Convert(reflect.TypeOf(int64(0))).Int()
		// Depending on serialization method, Size may be converted to any int/uint type
		size := reflect.ValueOf(request.Parameters["Size"]).Convert(reflect.TypeOf(int64(0))).Int()
		reader, _ := request.Parameters["Reader"].(io.ReadCloser)
		err := driver.WriteStream(path, offset, size, reader)
		response := WriteStreamResponse{
			Error: WrapError(err),
		}
		err = request.ResponseChannel.Send(&response)
		if err != nil {
			panic(err)
		}
	case "CurrentSize":
		path, _ := request.Parameters["Path"].(string)
		position, err := driver.CurrentSize(path)
		response := CurrentSizeResponse{
			Position: position,
			Error:    WrapError(err),
		}
		err = request.ResponseChannel.Send(&response)
		if err != nil {
			panic(err)
		}
	case "List":
		path, _ := request.Parameters["Path"].(string)
		keys, err := driver.List(path)
		response := ListResponse{
			Keys:  keys,
			Error: WrapError(err),
		}
		err = request.ResponseChannel.Send(&response)
		if err != nil {
			panic(err)
		}
	case "Move":
		sourcePath, _ := request.Parameters["SourcePath"].(string)
		destPath, _ := request.Parameters["DestPath"].(string)
		err := driver.Move(sourcePath, destPath)
		response := MoveResponse{
			Error: WrapError(err),
		}
		err = request.ResponseChannel.Send(&response)
		if err != nil {
			panic(err)
		}
//.........这里部分代码省略.........