/
local.go
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/
local.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package local contains a local file implementation of the Beam file system.
package local
import (
"context"
"io"
"os"
"path/filepath"
"time"
"github.com/apache/beam/sdks/v2/go/pkg/beam/io/filesystem"
)
func init() {
filesystem.Register("default", New)
}
type fs struct{}
// New creates a new local filesystem.
func New(_ context.Context) filesystem.Interface {
return &fs{}
}
func (f *fs) Close() error {
return nil
}
func (f *fs) List(_ context.Context, glob string) ([]string, error) {
return filepath.Glob(glob)
}
func (f *fs) OpenRead(_ context.Context, filename string) (io.ReadCloser, error) {
return os.Open(filename)
}
func (f *fs) OpenWrite(_ context.Context, filename string) (io.WriteCloser, error) {
if err := os.MkdirAll(filepath.Dir(filename), 0755); err != nil {
return nil, err
}
return os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
}
func (f *fs) Size(_ context.Context, filename string) (int64, error) {
file, err := os.Open(filename)
if err != nil {
return -1, err
}
info, err := file.Stat()
if err != nil {
return -1, err
}
return info.Size(), nil
}
// LastModified returns the time at which the file was last modified.
func (f *fs) LastModified(_ context.Context, filename string) (time.Time, error) {
info, err := os.Stat(filename)
if err != nil {
return time.Time{}, err
}
return info.ModTime(), nil
}
// Remove the named file from the filesystem.
func (f *fs) Remove(_ context.Context, filename string) error {
return os.Remove(filename)
}
// Rename the old path to the new path.
func (f *fs) Rename(_ context.Context, oldpath, newpath string) error {
return os.Rename(oldpath, newpath)
}
// Copy copies from oldpath to the newpath.
func (f *fs) Copy(_ context.Context, oldpath, newpath string) error {
srcFile, err := os.Open(oldpath)
if err != nil {
return err
}
defer srcFile.Close()
destFile, err := os.Create(newpath)
if err != nil {
return err
}
defer destFile.Close()
_, err = io.Copy(destFile, srcFile)
return err
}
// Compile time check for interface implementations.
var (
_ filesystem.LastModifiedGetter = ((*fs)(nil))
_ filesystem.Copier = ((*fs)(nil))
_ filesystem.Remover = ((*fs)(nil))
_ filesystem.Renamer = ((*fs)(nil))
)