| /* |
| 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 utils |
| |
| import ( |
| "errors" |
| "fmt" |
| "os" |
| "path/filepath" |
| ) |
| |
| func FileReadAll(path string) ([]byte, error) { |
| stat, err := os.Stat(path) |
| if err != nil { |
| return nil, err |
| } |
| file, err := os.Open(path) |
| if err != nil { |
| return nil, err |
| } |
| data := make([]byte, stat.Size()) |
| _, err = file.Read(data) |
| if err != nil { |
| return nil, err |
| } |
| return data, nil |
| } |
| |
| func ensureDir(path string) error { |
| info, err := os.Stat(path) |
| if err != nil { |
| if os.IsNotExist(err) { |
| err = os.MkdirAll(path, 0755) |
| } |
| return err |
| } |
| if !info.IsDir() { |
| return errors.New(path + " is a file") |
| } |
| return nil |
| } |
| |
| func WriteToFile(path string, data []byte) error { |
| if err := ensureDir(filepath.Dir(path)); err != nil { |
| return err |
| } |
| tmpFile, err := os.Create(path + ".tmp") |
| if err != nil { |
| return err |
| } |
| _, err = tmpFile.Write(data) |
| if err != nil { |
| return err |
| } |
| CheckError(fmt.Sprintf("close %s", tmpFile.Name()), tmpFile.Close()) |
| |
| prevContent, err := FileReadAll(path) |
| if err == nil { |
| bakFile, err := os.Create(path + ".bak") |
| if err != nil { |
| _, err = bakFile.Write(prevContent) |
| } |
| if err != nil { |
| return err |
| } |
| CheckError(fmt.Sprintf("close %s", bakFile.Name()), bakFile.Close()) |
| } |
| |
| _, err = os.Stat(path) |
| if err == nil { |
| CheckError(fmt.Sprintf("remove %s", path), os.Remove(path)) |
| } |
| return os.Rename(path+".tmp", path) |
| } |