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Beego/log.go
2013-07-25 19:04:26 +08:00

308 lines
6.8 KiB
Go

package beego
import (
"fmt"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"strings"
"sync"
"time"
)
type FileLogWriter struct {
*log.Logger
mw *MuxWriter
// The opened file
filename string
maxlines int
maxlines_curlines int
// Rotate at size
maxsize int
maxsize_cursize int
// Rotate daily
daily bool
maxdays int64
daily_opendate int
rotate bool
startLock sync.Mutex // Only one log can write to the file
}
type MuxWriter struct {
sync.Mutex
fd *os.File
}
func (l *MuxWriter) Write(b []byte) (int, error) {
l.Lock()
defer l.Unlock()
return l.fd.Write(b)
}
func (l *MuxWriter) SetFd(fd *os.File) {
if l.fd != nil {
l.fd.Close()
}
l.fd = fd
}
func NewFileWriter(fname string, rotate bool) *FileLogWriter {
w := &FileLogWriter{
filename: fname,
maxlines: 1000000,
maxsize: 1 << 28, //256 MB
daily: true,
maxdays: 7,
rotate: rotate,
}
// use MuxWriter instead direct use os.File for lock write when rotate
w.mw = new(MuxWriter)
// set MuxWriter as Logger's io.Writer
w.Logger = log.New(w.mw, "", log.Ldate|log.Ltime)
return w
}
// Set rotate at linecount (chainable). Must be called before call StartLogger
func (w *FileLogWriter) SetRotateLines(maxlines int) *FileLogWriter {
w.maxlines = maxlines
return w
}
// Set rotate at size (chainable). Must be called before call StartLogger
func (w *FileLogWriter) SetRotateSize(maxsize int) *FileLogWriter {
w.maxsize = maxsize
return w
}
// Set rotate daily (chainable). Must be called before call StartLogger
func (w *FileLogWriter) SetRotateDaily(daily bool) *FileLogWriter {
w.daily = daily
return w
}
// Set rotate daily's log keep for maxdays, other will delete
func (w *FileLogWriter) SetRotateMaxDays(maxdays int64) *FileLogWriter {
w.maxdays = maxdays
return w
}
func (w *FileLogWriter) StartLogger() error {
fd, err := w.createLogFile()
if err != nil {
return err
}
w.mw.SetFd(fd)
err = w.initFd()
if err != nil {
return err
}
BeeLogger = w
return nil
}
func (w *FileLogWriter) docheck(size int) {
w.startLock.Lock()
defer w.startLock.Unlock()
if (w.maxlines > 0 && w.maxlines_curlines >= w.maxlines) ||
(w.maxsize > 0 && w.maxsize_cursize >= w.maxsize) ||
(w.daily && time.Now().Day() != w.daily_opendate) {
if err := w.DoRotate(); err != nil {
fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.filename, err)
return
}
}
w.maxlines_curlines++
w.maxsize_cursize += size
}
func (w *FileLogWriter) Printf(format string, v ...interface{}) {
// Perform the write
str := fmt.Sprintf(format, v...)
n := 24 + len(str) // 24 stand for the length "2013/06/23 21:00:22 [T] "
w.docheck(n)
w.Logger.Printf(format, v...)
}
func (w *FileLogWriter) createLogFile() (*os.File, error) {
// Open the log file
fd, err := os.OpenFile(w.filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
return fd, err
}
func (w *FileLogWriter) initFd() error {
fd := w.mw.fd
finfo, err := fd.Stat()
if err != nil {
return fmt.Errorf("get stat err: %s\n", err)
}
w.maxsize_cursize = int(finfo.Size())
w.daily_opendate = time.Now().Day()
if finfo.Size() > 0 {
content, err := ioutil.ReadFile(w.filename)
if err != nil {
fmt.Println(err)
}
w.maxlines_curlines = len(strings.Split(string(content), "\n"))
} else {
w.maxlines_curlines = 0
}
return nil
}
func (w *FileLogWriter) DoRotate() error {
_, err := os.Lstat(w.filename)
if err == nil { // file exists
// Find the next available number
num := 1
fname := ""
for ; err == nil && num <= 999; num++ {
fname = w.filename + fmt.Sprintf(".%s.%03d", time.Now().Format("2006-01-02"), num)
_, err = os.Lstat(fname)
}
// return error if the last file checked still existed
if err == nil {
return fmt.Errorf("Rotate: Cannot find free log number to rename %s\n", w.filename)
}
// block Logger's io.Writer
w.mw.Lock()
defer w.mw.Unlock()
fd := w.mw.fd
fd.Close()
// close fd before rename
// Rename the file to its newfound home
err = os.Rename(w.filename, fname)
if err != nil {
return fmt.Errorf("Rotate: %s\n", err)
}
// re-start logger
err = w.StartLogger()
if err != nil {
return fmt.Errorf("Rotate StartLogger: %s\n", err)
}
go w.deleteOldLog()
}
return nil
}
func (w *FileLogWriter) deleteOldLog() {
dir := path.Dir(w.filename)
filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if !info.IsDir() && info.ModTime().Unix() < (time.Now().Unix()-60*60*24*w.maxdays) {
if strings.HasPrefix(filepath.Base(path), filepath.Base(w.filename)) {
os.Remove(path)
}
}
return nil
})
}
// Log levels to control the logging output.
const (
LevelTrace = iota
LevelDebug
LevelInfo
LevelWarning
LevelError
LevelCritical
)
// logLevel controls the global log level used by the logger.
var level = LevelTrace
// LogLevel returns the global log level and can be used in
// own implementations of the logger interface.
func Level() int {
return level
}
// SetLogLevel sets the global log level used by the simple
// logger.
func SetLevel(l int) {
level = l
}
type IBeeLogger interface {
Fatal(v ...interface{})
Fatalf(format string, v ...interface{})
Fatalln(v ...interface{})
Flags() int
Output(calldepth int, s string) error
Panic(v ...interface{})
Panicf(format string, v ...interface{})
Panicln(v ...interface{})
Prefix() string
Print(v ...interface{})
Printf(format string, v ...interface{})
Println(v ...interface{})
SetFlags(flag int)
SetPrefix(prefix string)
}
// logger references the used application logger.
var BeeLogger IBeeLogger
func init() {
BeeLogger = log.New(os.Stdout, "", log.Ldate|log.Ltime)
}
// SetLogger sets a new logger.
func SetLogger(l *log.Logger) {
BeeLogger = l
}
// Trace logs a message at trace level.
func Trace(v ...interface{}) {
if level <= LevelTrace {
BeeLogger.Printf("[T] %v\n", v)
}
}
// Debug logs a message at debug level.
func Debug(v ...interface{}) {
if level <= LevelDebug {
BeeLogger.Printf("[D] %v\n", v)
}
}
// Info logs a message at info level.
func Info(v ...interface{}) {
if level <= LevelInfo {
BeeLogger.Printf("[I] %v\n", v)
}
}
// Warning logs a message at warning level.
func Warn(v ...interface{}) {
if level <= LevelWarning {
BeeLogger.Printf("[W] %v\n", v)
}
}
// Error logs a message at error level.
func Error(v ...interface{}) {
if level <= LevelError {
BeeLogger.Printf("[E] %v\n", v)
}
}
// Critical logs a message at critical level.
func Critical(v ...interface{}) {
if level <= LevelCritical {
BeeLogger.Printf("[C] %v\n", v)
}
}