mirror of https://github.com/astaxie/beego.git
315 lines
6.9 KiB
Go
315 lines
6.9 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package logs
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"sync"
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"time"
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)
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// fileLogWriter implements LoggerInterface.
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// It writes messages by lines limit, file size limit, or time frequency.
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type fileLogWriter struct {
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sync.Mutex // write log order by order and atomic incr maxLinesCurLines and maxSizeCurSize
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// The opened file
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Filename string `json:"filename"`
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fileWriter *os.File
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// Rotate at line
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MaxLines int `json:"maxlines"`
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maxLinesCurLines int
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// Rotate at size
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MaxSize int `json:"maxsize"`
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maxSizeCurSize int
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// Rotate daily
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Daily bool `json:"daily"`
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MaxDays int64 `json:"maxdays"`
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dailyOpenDate int
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Rotate bool `json:"rotate"`
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Level int `json:"level"`
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Perm os.FileMode `json:"perm"`
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}
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// NewFileWriter create a FileLogWriter returning as LoggerInterface.
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func newFileWriter() Logger {
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w := &fileLogWriter{
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Filename: "",
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MaxLines: 1000000,
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MaxSize: 1 << 28, //256 MB
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Daily: true,
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MaxDays: 7,
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Rotate: true,
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Level: LevelTrace,
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Perm: 0660,
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}
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return w
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}
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// Init file logger with json config.
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// jsonConfig like:
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// {
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// "filename":"logs/beego.log",
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// "maxLines":10000,
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// "maxsize":1<<30,
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// "daily":true,
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// "maxDays":15,
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// "rotate":true,
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// "perm":0600
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// }
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func (w *fileLogWriter) Init(jsonConfig string) error {
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err := json.Unmarshal([]byte(jsonConfig), w)
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if err != nil {
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return err
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}
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if len(w.Filename) == 0 {
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return errors.New("jsonconfig must have filename")
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}
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err = w.startLogger()
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return err
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}
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// start file logger. create log file and set to locker-inside file writer.
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func (w *fileLogWriter) startLogger() error {
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file, err := w.createLogFile()
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if err != nil {
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return err
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}
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if w.fileWriter != nil {
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w.fileWriter.Close()
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}
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w.fileWriter = file
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return w.initFd()
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}
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func (w *fileLogWriter) needRotate(size int, day int) bool {
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return (w.MaxLines > 0 && w.maxLinesCurLines >= w.MaxLines) ||
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(w.MaxSize > 0 && w.maxSizeCurSize >= w.MaxSize) ||
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(w.Daily && day != w.dailyOpenDate)
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}
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// WriteMsg write logger message into file.
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func (w *fileLogWriter) WriteMsg(msg string, level int) error {
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if level > w.Level {
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return nil
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}
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//2016/01/12 21:34:33
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now := time.Now()
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y, mo, d := now.Date()
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h, mi, s := now.Clock()
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//len(2006/01/02 15:03:04)==19
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var buf [20]byte
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t := 3
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for y >= 10 {
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p := y / 10
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buf[t] = byte('0' + y - p*10)
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y = p
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t--
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}
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buf[0] = byte('0' + y)
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buf[4] = '/'
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if mo > 9 {
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buf[5] = '1'
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buf[6] = byte('0' + mo - 9)
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} else {
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buf[5] = '0'
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buf[6] = byte('0' + mo)
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}
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buf[7] = '/'
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t = d / 10
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buf[8] = byte('0' + t)
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buf[9] = byte('0' + d - t*10)
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buf[10] = ' '
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t = h / 10
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buf[11] = byte('0' + t)
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buf[12] = byte('0' + h - t*10)
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buf[13] = ':'
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t = mi / 10
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buf[14] = byte('0' + t)
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buf[15] = byte('0' + mi - t*10)
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buf[16] = ':'
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t = s / 10
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buf[17] = byte('0' + t)
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buf[18] = byte('0' + s - t*10)
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buf[19] = ' '
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msg = string(buf[0:]) + msg + "\n"
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if w.Rotate {
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if w.needRotate(len(msg), d) {
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w.Lock()
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if w.needRotate(len(msg), d) {
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if err := w.doRotate(); err != nil {
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fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.Filename, err)
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}
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}
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w.Unlock()
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}
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}
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w.Lock()
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_, err := w.fileWriter.Write([]byte(msg))
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if err == nil {
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w.maxLinesCurLines++
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w.maxSizeCurSize += len(msg)
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}
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w.Unlock()
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return err
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}
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func (w *fileLogWriter) createLogFile() (*os.File, error) {
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// Open the log file
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fd, err := os.OpenFile(w.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, w.Perm)
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return fd, err
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}
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func (w *fileLogWriter) initFd() error {
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fd := w.fileWriter
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fInfo, err := fd.Stat()
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if err != nil {
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return fmt.Errorf("get stat err: %s\n", err)
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}
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w.maxSizeCurSize = int(fInfo.Size())
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w.dailyOpenDate = time.Now().Day()
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w.maxLinesCurLines = 0
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if fInfo.Size() > 0 {
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count, err := w.lines()
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if err != nil {
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return err
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}
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w.maxLinesCurLines = count
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}
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return nil
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}
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func (w *fileLogWriter) lines() (int, error) {
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fd, err := os.Open(w.Filename)
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if err != nil {
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return 0, err
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}
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defer fd.Close()
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buf := make([]byte, 32768) // 32k
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count := 0
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lineSep := []byte{'\n'}
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for {
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c, err := fd.Read(buf)
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if err != nil && err != io.EOF {
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return count, err
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}
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count += bytes.Count(buf[:c], lineSep)
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if err == io.EOF {
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break
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}
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}
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return count, nil
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}
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// DoRotate means it need to write file in new file.
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// new file name like xx.2013-01-01.2.log
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func (w *fileLogWriter) doRotate() error {
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_, err := os.Lstat(w.Filename)
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if err != nil {
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return err
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}
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// file exists
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// Find the next available number
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num := 1
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fName := ""
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suffix := filepath.Ext(w.Filename)
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filenameOnly := strings.TrimSuffix(w.Filename, suffix)
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if suffix == "" {
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suffix = ".log"
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}
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for ; err == nil && num <= 999; num++ {
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fName = filenameOnly + fmt.Sprintf(".%s.%03d%s", time.Now().Format("2006-01-02"), num, suffix)
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_, err = os.Lstat(fName)
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}
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// return error if the last file checked still existed
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if err == nil {
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return fmt.Errorf("Rotate: Cannot find free log number to rename %s\n", w.Filename)
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}
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// close fileWriter before rename
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w.fileWriter.Close()
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// Rename the file to its new found name
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// even if occurs error,we MUST guarantee to restart new logger
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renameErr := os.Rename(w.Filename, fName)
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// re-start logger
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startLoggerErr := w.startLogger()
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go w.deleteOldLog()
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if startLoggerErr != nil {
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return fmt.Errorf("Rotate StartLogger: %s\n", startLoggerErr)
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}
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if renameErr != nil {
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return fmt.Errorf("Rotate: %s\n", renameErr)
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}
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return nil
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}
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func (w *fileLogWriter) deleteOldLog() {
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dir := filepath.Dir(w.Filename)
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filepath.Walk(dir, func(path string, info os.FileInfo, err error) (returnErr error) {
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defer func() {
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if r := recover(); r != nil {
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fmt.Fprintf(os.Stderr, "Unable to delete old log '%s', error: %v\n", path, r)
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}
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}()
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if !info.IsDir() && info.ModTime().Unix() < (time.Now().Unix()-60*60*24*w.MaxDays) {
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if strings.HasPrefix(filepath.Base(path), filepath.Base(w.Filename)) {
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os.Remove(path)
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}
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}
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return
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})
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}
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// Destroy close the file description, close file writer.
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func (w *fileLogWriter) Destroy() {
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w.fileWriter.Close()
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}
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// Flush flush file logger.
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// there are no buffering messages in file logger in memory.
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// flush file means sync file from disk.
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func (w *fileLogWriter) Flush() {
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w.fileWriter.Sync()
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}
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func init() {
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Register("file", newFileWriter)
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}
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