tidb noop 源码
tidb noop 代码
文件路径：/br/pkg/storage/noop.go
// Copyright 2020 PingCAP, Inc. Licensed under Apache-2.0.
package storage
import (
"context"
)
type noopStorage struct{}
// DeleteFile delete the file in storage
func (*noopStorage) DeleteFile(_ context.Context, _ string) error {
return nil
}
// WriteFile file to storage.
func (*noopStorage) WriteFile(_ context.Context, _ string, _ []byte) error {
return nil
}
// ReadFile storage file.
func (*noopStorage) ReadFile(_ context.Context, _ string) ([]byte, error) {
return []byte{}, nil
}
// FileExists return true if file exists.
func (*noopStorage) FileExists(_ context.Context, _ string) (bool, error) {
return false, nil
}
// Open a Reader by file path.
func (*noopStorage) Open(_ context.Context, _ string) (ExternalFileReader, error) {
return noopReader{}, nil
}
// WalkDir traverse all the files in a dir.
func (*noopStorage) WalkDir(_ context.Context, _ *WalkOption, _ func(string, int64) error) error {
return nil
}
func (*noopStorage) URI() string {
return "noop:///"
}
// Create implements ExternalStorage interface.
func (*noopStorage) Create(_ context.Context, _ string) (ExternalFileWriter, error) {
return &noopWriter{}, nil
}
// Rename implements ExternalStorage interface.
func (*noopStorage) Rename(_ context.Context, _, _ string) error {
return nil
}
func newNoopStorage() *noopStorage {
return &noopStorage{}
}
type noopReader struct{}
func (noopReader) Read(p []byte) (n int, err error) {
return len(p), nil
}
func (noopReader) Close() error {
return nil
}
func (noopReader) Seek(offset int64, _ int) (int64, error) {
return offset, nil
}
type noopWriter struct{}
func (noopWriter) Write(_ context.Context, p []byte) (int, error) {
return len(p), nil
}
func (noopWriter) Close(_ context.Context) error {
return nil
}
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