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writer.go
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/
writer.go
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package log
import (
"log"
"os"
"path"
"sort"
"strings"
"sync"
"sync/atomic"
"time"
"unsafe"
"1Panel/backend/global"
"1Panel/backend/utils/files"
)
type Writer struct {
m Manager
file *os.File
absPath string
fire chan string
cf *Config
rollingfilech chan string
}
type AsynchronousWriter struct {
Writer
ctx chan int
queue chan []byte
errChan chan error
closed int32
wg sync.WaitGroup
}
func (w *AsynchronousWriter) Close() error {
if atomic.CompareAndSwapInt32(&w.closed, 0, 1) {
close(w.ctx)
w.onClose()
func() {
defer func() {
if r := recover(); r != nil {
global.LOG.Error(r)
}
}()
w.m.Close()
}()
return w.file.Close()
}
return ErrClosed
}
func (w *AsynchronousWriter) onClose() {
var err error
for {
select {
case b := <-w.queue:
if _, err = w.file.Write(b); err != nil {
select {
case w.errChan <- err:
default:
_asyncBufferPool.Put(&b)
return
}
}
_asyncBufferPool.Put(&b)
default:
return
}
}
}
var _asyncBufferPool = sync.Pool{
New: func() interface{} {
return make([]byte, BufferSize)
},
}
func NewWriterFromConfig(c *Config) (RollingWriter, error) {
if c.LogPath == "" || c.FileName == "" {
return nil, ErrInvalidArgument
}
if err := os.MkdirAll(c.LogPath, 0700); err != nil {
return nil, err
}
filepath := FilePath(c)
file, err := os.OpenFile(filepath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
return nil, err
}
if err := dupWrite(file); err != nil {
return nil, err
}
mng, err := NewManager(c)
if err != nil {
return nil, err
}
var rollingWriter RollingWriter
writer := Writer{
m: mng,
file: file,
absPath: filepath,
fire: mng.Fire(),
cf: c,
}
if c.MaxRemain > 0 {
writer.rollingfilech = make(chan string, c.MaxRemain)
dir, err := os.ReadDir(c.LogPath)
if err != nil {
mng.Close()
return nil, err
}
files := make([]string, 0, 10)
for _, fi := range dir {
if fi.IsDir() {
continue
}
fileName := c.FileName
if strings.Contains(fi.Name(), fileName) && strings.Contains(fi.Name(), c.LogSuffix+".gz") {
start := strings.Index(fi.Name(), "-")
end := strings.Index(fi.Name(), c.LogSuffix)
name := fi.Name()
if start > 0 && end > 0 {
_, err := time.Parse(c.TimeTagFormat, name[start+1:end])
if err == nil {
files = append(files, fi.Name())
}
}
}
}
sort.Slice(files, func(i, j int) bool {
t1Start := strings.Index(files[i], "-")
t1End := strings.Index(files[i], c.LogSuffix)
t2Start := strings.Index(files[i], "-")
t2End := strings.Index(files[i], c.LogSuffix)
t1, _ := time.Parse(c.TimeTagFormat, files[i][t1Start+1:t1End])
t2, _ := time.Parse(c.TimeTagFormat, files[j][t2Start+1:t2End])
return t1.Before(t2)
})
for _, file := range files {
retry:
select {
case writer.rollingfilech <- path.Join(c.LogPath, file):
default:
writer.DoRemove()
goto retry
}
}
}
wr := &AsynchronousWriter{
ctx: make(chan int),
queue: make(chan []byte, QueueSize),
errChan: make(chan error, QueueSize),
wg: sync.WaitGroup{},
closed: 0,
Writer: writer,
}
wr.wg.Add(1)
go wr.writer()
wr.wg.Wait()
rollingWriter = wr
return rollingWriter, nil
}
func (w *AsynchronousWriter) writer() {
var err error
w.wg.Done()
for {
select {
case filename := <-w.fire:
if err = w.Reopen(filename); err != nil && len(w.errChan) < cap(w.errChan) {
w.errChan <- err
}
case b := <-w.queue:
if _, err = w.file.Write(b); err != nil && len(w.errChan) < cap(w.errChan) {
w.errChan <- err
}
_asyncBufferPool.Put(&b)
case <-w.ctx:
return
}
}
}
func (w *Writer) DoRemove() {
file := <-w.rollingfilech
if err := os.Remove(file); err != nil {
log.Println("error in remove log file", file, err)
}
}
func (w *Writer) Write(b []byte) (int, error) {
var ok = false
for !ok {
select {
case filename := <-w.fire:
if err := w.Reopen(filename); err != nil {
return 0, err
}
default:
ok = true
}
}
fp := atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&w.file)))
file := (*os.File)(fp)
return file.Write(b)
}
func (w *Writer) Reopen(file string) error {
fileInfo, err := w.file.Stat()
if err != nil {
return err
}
if fileInfo.Size() == 0 {
return nil
}
w.file.Close()
if err := os.Rename(w.absPath, file); err != nil {
return err
}
newFile, err := os.OpenFile(w.absPath, DefaultFileFlag, DefaultFileMode)
if err != nil {
return err
}
w.file = newFile
go func() {
if err := w.CompressFile(file); err != nil {
log.Println("error in compress log file", err)
return
}
if w.cf.MaxRemain > 0 {
retry:
select {
case w.rollingfilech <- file:
default:
w.DoRemove()
goto retry
}
}
}()
return nil
}
func (w *Writer) CompressFile(logFile string) error {
op := files.NewFileOp()
comFileName := path.Base(logFile) + ".gz"
filePath := path.Dir(logFile)
if err := op.Compress([]string{logFile}, filePath, comFileName, files.Gz); err != nil {
return err
}
if errR := os.Remove(logFile); errR != nil {
return errR
}
return nil
}