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package logger
import (
"bytes"
"fmt"
"io"
"os"
"path"
"path/filepath"
"sort"
"sync"
)
type File struct {
sync.RWMutex
Path string
File *os.File
}
func (v *File) Flush() error {
v.Lock()
defer v.Unlock()
if v.File != nil {
err := v.File.Sync()
v.File = nil
return err
}
return nil
}
func (v *File) Close() error {
v.Lock()
defer v.Unlock()
if v.File != nil {
err := v.File.Close()
v.File = nil
return err
}
return nil
}
func (v *File) getRotatedFileList() ([]logFile, error) {
var list []logFile
err := filepath.Walk(path.Dir(v.Path), func(p string,
info os.FileInfo, err error) error {
pattern := "*" + path.Base(v.Path) + "*"
if ok, err := path.Match(pattern, path.Base(p)); ok && err == nil {
i := extractIndex(info)
list = append(list, logFile{FileInfo: info, Index: i})
} else if err != nil {
return err
}
return nil
})
if err != nil {
return nil, err
}
s := &sortLogFiles{Items: list}
sort.Sort(s)
return s.Items, nil
}
func (v *File) doRotate(items []logFile, rotateMaxCount int) error {
if len(items) > 0 {
// delete last files
deleteCount := len(items) - rotateMaxCount + 1
if deleteCount > 0 {
for i := 0; i < deleteCount; i++ {
err := os.Remove(items[i].FileInfo.Name())
if err != nil {
return err
}
}
items = items[deleteCount:]
}
// change names of rest files
baseFilePath := items[len(items)-1].FileInfo.Name()
movs := make([]int, len(items))
// 1st round to change names
for i, item := range items {
movs[i] = i + 100000
err := os.Rename(item.FileInfo.Name(),
fmt.Sprintf("%s.%d", baseFilePath, movs[i]))
if err != nil {
return err
}
}
// 2nd round to change names
for i, item := range movs {
err := os.Rename(fmt.Sprintf("%s.%d", baseFilePath, item),
fmt.Sprintf("%s.%d", baseFilePath, len(items)-i))
if err != nil {
return err
}
}
}
return nil
}
func (v *File) rotateFiles(rotateMaxSize int64, rotateMaxCount int) error {
fs, err := v.File.Stat()
if err != nil {
return err
}
if fs.Size() > rotateMaxSize {
if v.File != nil {
err := v.File.Close()
if err != nil {
return err
}
v.File = nil
}
list, err := v.getRotatedFileList()
if err != nil {
return err
}
if err = v.doRotate(list, rotateMaxCount); err != nil {
return err
}
}
return nil
}
func (v *File) getFile() (*os.File, error) {
v.Lock()
defer v.Unlock()
if v.File == nil {
file, err := os.OpenFile(v.Path, os.O_RDWR|os.O_APPEND, 0660)
if err != nil {
file, err = os.Create(v.Path)
if err != nil {
return nil, err
}
}
v.File = file
}
return v.File, nil
}
func (v *File) writeToFile(msg string, rotateMaxSize int64, rotateMaxCount int) error {
file, err := v.getFile()
if err != nil {
return err
}
v.Lock()
defer v.Unlock()
var buf bytes.Buffer
buf.WriteString(msg)
buf.WriteString(fmt.Sprintln())
if _, err := io.Copy(file, &buf); err != nil {
return err
}
// if err = file.Sync(); err != nil {
// return err
// }
if err := v.rotateFiles(rotateMaxSize, rotateMaxCount); err != nil {
return err
}
return nil
}
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