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noop.go
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noop.go
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// Copyright 2020 PingCAP, Inc. Licensed under Apache-2.0.
package storage
import (
"context"
)
type noopStorage struct{}
// WriteFile file to storage.
func (*noopStorage) WriteFile(ctx context.Context, name string, data []byte) error {
return nil
}
// ReadFile storage file.
func (*noopStorage) ReadFile(ctx context.Context, name string) ([]byte, error) {
return []byte{}, nil
}
// FileExists return true if file exists.
func (*noopStorage) FileExists(ctx context.Context, name string) (bool, error) {
return false, nil
}
// Open a Reader by file path.
func (*noopStorage) Open(ctx context.Context, path string) (ExternalFileReader, error) {
return noopReader{}, nil
}
// WalkDir traverse all the files in a dir.
func (*noopStorage) WalkDir(ctx context.Context, opt *WalkOption, fn func(string, int64) error) error {
return nil
}
func (s *noopStorage) URI() string {
return "noop:///"
}
// Create implements ExternalStorage interface.
func (*noopStorage) Create(ctx context.Context, name string) (ExternalFileWriter, error) {
panic("noop storage not support multi-upload")
}
func newNoopStorage() *noopStorage {
return &noopStorage{}
}
type noopReader struct{}
func (noopReader) Read(p []byte) (n int, err error) {
return 0, nil
}
func (noopReader) Close() error {
return nil
}
func (noopReader) Seek(offset int64, whence int) (int64, error) {
return 0, nil
}