/
logger_file.go
103 lines (81 loc) · 1.45 KB
/
logger_file.go
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package common
import (
"io"
"os"
"sync"
)
type fileWriter struct {
io.Writer
mu sync.Mutex
file *os.File
filesize int
}
func newFileWriter() (*fileWriter, error) {
fw := &fileWriter{}
if FileExists(*FlagLogFileName) {
fi, err := os.Stat(*FlagLogFileName)
if err != nil {
return nil, err
}
fw.filesize = int(fi.Size())
fw.file, err = os.OpenFile(*FlagLogFileName, os.O_RDWR|os.O_CREATE|os.O_APPEND, DefaultFileMode)
if err != nil {
return nil, err
}
} else {
err := fw.createFile()
if err != nil {
return nil, err
}
}
return fw, nil
}
func (fw *fileWriter) Write(msg []byte) (int, error) {
fw.mu.Lock()
defer fw.mu.Unlock()
if fw.filesize+len(msg) > *FlagLogFileSize {
err := fw.createFile()
if err != nil {
return 0, err
}
}
n, err := fw.file.Write(msg)
if err != nil {
return n, err
}
fw.filesize += n
err = fw.file.Sync()
if err != nil {
return n, err
}
return n, nil
}
func (fw *fileWriter) createFile() error {
err := fw.closeFile()
if err != nil {
return err
}
err = FileBackup(*FlagLogFileName)
if err != nil {
return err
}
fw.file, err = os.OpenFile(*FlagLogFileName, os.O_RDWR|os.O_CREATE|os.O_APPEND, DefaultFileMode)
if err != nil {
return err
}
return nil
}
func (fw *fileWriter) closeFile() error {
if fw.file == nil {
return nil
}
defer func() {
fw.file = nil
fw.filesize = 0
}()
err := fw.file.Close()
if err != nil {
return err
}
return nil
}