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filestorer.go
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/
filestorer.go
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package storer
import (
"io/ioutil"
"os"
)
// FileStorer 文件配置存储器
type FileStorer struct {
file *os.File
}
// MustNewFileStorer 创建文件配置存储器
func MustNewFileStorer(filePath string) Storer {
file, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
panic(err)
}
return &FileStorer{
file: file,
}
}
// Truncate 清空配置
func (storer *FileStorer) Truncate() (err error) {
err = storer.file.Truncate(0)
return
}
// Writer 刷写配置
func (storer *FileStorer) Writer(data []byte) error {
err := storer.Truncate()
if err != nil {
return err
}
_, err = storer.file.Write(data)
if err != nil {
return err
}
// seek file point to start
_, err = storer.file.Seek(0, 0)
return err
}
// Read 读取配置
func (storer *FileStorer) Read() (data []byte, err error) {
d, err := ioutil.ReadAll(storer.file)
if err != nil {
return []byte{}, err
}
// seek file point to start
_, err = storer.file.Seek(0, 0)
return d, err
}