Logger package for gitea repositories
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

259 lines
5.9 KiB

// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package log
import (
"bufio"
"compress/gzip"
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"time"
)
// FileLogger implements LoggerProvider.
// It writes messages by lines limit, file size limit, or time frequency.
type FileLogger struct {
WriterLogger
mw *MuxWriter
// The opened file
Filename string `json:"filename"`
// Rotate at size
Maxsize int `json:"maxsize"`
maxsizeCursize int
// Rotate daily
Daily bool `json:"daily"`
Maxdays int64 `json:"maxdays"`
dailyOpenDate int
Rotate bool `json:"rotate"`
Compress bool `json:"compress"`
CompressionLevel int `json:"compressionLevel"`
startLock sync.Mutex // Only one log can write to the file
}
// MuxWriter an *os.File writer with locker.
type MuxWriter struct {
mu sync.Mutex
fd *os.File
owner *FileLogger
}
// Write writes to os.File.
func (mw *MuxWriter) Write(b []byte) (int, error) {
mw.mu.Lock()
defer mw.mu.Unlock()
mw.owner.docheck(len(b))
return mw.fd.Write(b)
}
// Close the internal writer
func (mw *MuxWriter) Close() error {
return mw.fd.Close()
}
// SetFd sets os.File in writer.
func (mw *MuxWriter) SetFd(fd *os.File) {
if mw.fd != nil {
mw.fd.Close()
}
mw.fd = fd
}
// NewFileLogger create a FileLogger returning as LoggerProvider.
func NewFileLogger() LoggerProvider {
log := &FileLogger{
Filename: "",
Maxsize: 1 << 28, //256 MB
Daily: true,
Maxdays: 7,
Rotate: true,
Compress: true,
CompressionLevel: gzip.DefaultCompression,
}
log.Level = TRACE
// use MuxWriter instead direct use os.File for lock write when rotate
log.mw = new(MuxWriter)
log.mw.owner = log
return log
}
// Init file logger with json config.
// config like:
// {
// "filename":"log/gogs.log",
// "maxsize":1<<30,
// "daily":true,
// "maxdays":15,
// "rotate":true
// }
func (log *FileLogger) Init(config string) error {
if err := json.Unmarshal([]byte(config), log); err != nil {
return err
}
if len(log.Filename) == 0 {
return errors.New("config must have filename")
}
// set MuxWriter as Logger's io.Writer
log.NewWriterLogger(log.mw)
return log.StartLogger()
}
// StartLogger start file logger. create log file and set to locker-inside file writer.
func (log *FileLogger) StartLogger() error {
fd, err := log.createLogFile()
if err != nil {
return err
}
log.mw.SetFd(fd)
return log.initFd()
}
func (log *FileLogger) docheck(size int) {
log.startLock.Lock()
defer log.startLock.Unlock()
if log.Rotate && ((log.Maxsize > 0 && log.maxsizeCursize >= log.Maxsize) ||
(log.Daily && time.Now().Day() != log.dailyOpenDate)) {
if err := log.DoRotate(); err != nil {
fmt.Fprintf(os.Stderr, "FileLogger(%q): %s\n", log.Filename, err)
return
}
}
log.maxsizeCursize += size
}
func (log *FileLogger) createLogFile() (*os.File, error) {
// Open the log file
return os.OpenFile(log.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
}
func (log *FileLogger) initFd() error {
fd := log.mw.fd
finfo, err := fd.Stat()
if err != nil {
return fmt.Errorf("get stat: %v", err)
}
log.maxsizeCursize = int(finfo.Size())
log.dailyOpenDate = time.Now().Day()
return nil
}
// DoRotate means it need to write file in new file.
// new file name like xx.log.2013-01-01.2
func (log *FileLogger) DoRotate() error {
_, err := os.Lstat(log.Filename)
if err == nil { // file exists
// Find the next available number
num := 1
fname := ""
for ; err == nil && num <= 999; num++ {
fname = log.Filename + fmt.Sprintf(".%s.%03d", time.Now().Format("2006-01-02"), num)
_, err = os.Lstat(fname)
if log.Compress && err != nil {
_, err = os.Lstat(fname + ".gz")
}
}
// return error if the last file checked still existed
if err == nil {
return fmt.Errorf("rotate: cannot find free log number to rename %s", log.Filename)
}
fd := log.mw.fd
fd.Close()
// close fd before rename
// Rename the file to its newfound home
if err = os.Rename(log.Filename, fname); err != nil {
return fmt.Errorf("Rotate: %v", err)
}
if log.Compress {
go compressOldLogFile(fname, log.CompressionLevel)
}
// re-start logger
if err = log.StartLogger(); err != nil {
return fmt.Errorf("Rotate StartLogger: %v", err)
}
go log.deleteOldLog()
}
return nil
}
func compressOldLogFile(fname string, compressionLevel int) error {
reader, err := os.Open(fname)
if err != nil {
return err
}
defer reader.Close()
buffer := bufio.NewReader(reader)
fw, err := os.OpenFile(fname+".gz", os.O_WRONLY|os.O_CREATE, 0660)
if err != nil {
return err
}
defer fw.Close()
zw, err := gzip.NewWriterLevel(fw, compressionLevel)
if err != nil {
return err
}
defer zw.Close()
_, err = buffer.WriteTo(zw)
if err != nil {
zw.Close()
fw.Close()
os.Remove(fname + ".gz")
return err
}
reader.Close()
return os.Remove(fname)
}
func (log *FileLogger) deleteOldLog() {
dir := filepath.Dir(log.Filename)
_ = filepath.Walk(dir, func(path string, info os.FileInfo, err error) (returnErr error) {
defer func() {
if r := recover(); r != nil {
returnErr = fmt.Errorf("Unable to delete old log '%s', error: %+v", path, r)
}
}()
if !info.IsDir() && info.ModTime().Unix() < (time.Now().Unix()-60*60*24*log.Maxdays) {
if strings.HasPrefix(filepath.Base(path), filepath.Base(log.Filename)) {
if err := os.Remove(path); err != nil {
returnErr = fmt.Errorf("Failed to remove %s: %v", path, err)
}
}
}
return returnErr
})
}
// Flush flush file logger.
// there are no buffering messages in file logger in memory.
// flush file means sync file from disk.
func (log *FileLogger) Flush() {
_ = log.mw.fd.Sync()
}
// GetName returns the default name for this implementation
func (log *FileLogger) GetName() string {
return "file"
}
func init() {
Register("file", NewFileLogger)
}