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filelog.go
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filelog.go
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// Copyright (C) 2010, Kyle Lemons <[email protected]>. All rights reserved.
package log4go
import (
"fmt"
"os"
"time"
)
// This log writer sends output to a file
type FileLogWriter struct {
rec chan *LogRecord
rot chan bool
// The opened file
filename string
file *os.File
// The logging format
format string
// File header/trailer
header, trailer string
// Rotate at linecount
maxlines int
maxlines_curlines int
// Rotate at size
maxsize int
maxsize_cursize int
// Rotate daily
daily bool
daily_opendate int
// Keep old logfiles (.001, .002, etc)
rotate bool
maxbackup int
}
// This is the FileLogWriter's output method
func (w *FileLogWriter) LogWrite(rec *LogRecord) {
w.rec <- rec
}
func (w *FileLogWriter) Close() {
close(w.rec)
w.file.Sync()
}
// NewFileLogWriter creates a new LogWriter which writes to the given file and
// has rotation enabled if rotate is true.
//
// If rotate is true, any time a new log file is opened, the old one is renamed
// with a .### extension to preserve it. The various Set* methods can be used
// to configure log rotation based on lines, size, and daily.
//
// The standard log-line format is:
// [%D %T] [%L] (%S) %M
func NewFileLogWriter(fname string, rotate bool) *FileLogWriter {
w := &FileLogWriter{
rec: make(chan *LogRecord, LogBufferLength),
rot: make(chan bool),
filename: fname,
format: "[%D %T] [%L] (%S) %M",
rotate: rotate,
maxbackup: 999,
}
// open the file for the first time
if err := w.intRotate(); err != nil {
fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.filename, err)
return nil
}
go func() {
defer func() {
if w.file != nil {
fmt.Fprint(w.file, FormatLogRecord(w.trailer, &LogRecord{Created: time.Now()}))
w.file.Close()
}
}()
for {
select {
case <-w.rot:
if err := w.intRotate(); err != nil {
fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.filename, err)
return
}
case rec, ok := <-w.rec:
if !ok {
return
}
now := time.Now()
if (w.maxlines > 0 && w.maxlines_curlines >= w.maxlines) ||
(w.maxsize > 0 && w.maxsize_cursize >= w.maxsize) ||
(w.daily && now.Day() != w.daily_opendate) {
if err := w.intRotate(); err != nil {
fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.filename, err)
return
}
}
// Perform the write
n, err := fmt.Fprint(w.file, FormatLogRecord(w.format, rec))
if err != nil {
fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.filename, err)
return
}
// Update the counts
w.maxlines_curlines
w.maxsize_cursize = n
}
}
}()
return w
}
// Request that the logs rotate
func (w *FileLogWriter) Rotate() {
w.rot <- true
}
// If this is called in a threaded context, it MUST be synchronized
func (w *FileLogWriter) intRotate() error {
// Close any log file that may be open
if w.file != nil {
fmt.Fprint(w.file, FormatLogRecord(w.trailer, &LogRecord{Created: time.Now()}))
w.file.Close()
}
// If we are keeping log files, move it to the next available number
if w.rotate {
_, err := os.Lstat(w.filename)
if err == nil { // file exists
// Find the next available number
num := 1
fname := ""
if w.daily && time.Now().Day() != w.daily_opendate {
yesterday := time.Now().AddDate(0, 0, -1).Format("2006-01-02")
for ; err == nil && num <= w.maxbackup; num {
fname = w.filename fmt.Sprintf(".%s.d", yesterday, 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)
}
} else {
num = w.maxbackup - 1
for ; num >= 1; num-- {
fname = w.filename fmt.Sprintf(".%d", num)
nfname := w.filename fmt.Sprintf(".%d", num 1)
_, err = os.Lstat(fname)
if err == nil {
os.Rename(fname, nfname)
}
}
}
w.file.Close()
// Rename the file to its newfound home
err = os.Rename(w.filename, fname)
if err != nil {
return fmt.Errorf("Rotate: %s\n", err)
}
}
}
// Open the log file
fd, err := os.OpenFile(w.filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
if err != nil {
return err
}
w.file = fd
now := time.Now()
fmt.Fprint(w.file, FormatLogRecord(w.header, &LogRecord{Created: now}))
// Set the daily open date to the current date
w.daily_opendate = now.Day()
// initialize rotation values
w.maxlines_curlines = 0
w.maxsize_cursize = 0
return nil
}
// Set the logging format (chainable). Must be called before the first log
// message is written.
func (w *FileLogWriter) SetFormat(format string) *FileLogWriter {
w.format = format
return w
}
// Set the logfile header and footer (chainable). Must be called before the first log
// message is written. These are formatted similar to the FormatLogRecord (e.g.
// you can use %D and %T in your header/footer for date and time).
func (w *FileLogWriter) SetHeadFoot(head, foot string) *FileLogWriter {
w.header, w.trailer = head, foot
if w.maxlines_curlines == 0 {
fmt.Fprint(w.file, FormatLogRecord(w.header, &LogRecord{Created: time.Now()}))
}
return w
}
// Set rotate at linecount (chainable). Must be called before the first log
// message is written.
func (w *FileLogWriter) SetRotateLines(maxlines int) *FileLogWriter {
//fmt.Fprintf(os.Stderr, "FileLogWriter.SetRotateLines: %v\n", maxlines)
w.maxlines = maxlines
return w
}
// Set rotate at size (chainable). Must be called before the first log message
// is written.
func (w *FileLogWriter) SetRotateSize(maxsize int) *FileLogWriter {
//fmt.Fprintf(os.Stderr, "FileLogWriter.SetRotateSize: %v\n", maxsize)
w.maxsize = maxsize
return w
}
// Set rotate daily (chainable). Must be called before the first log message is
// written.
func (w *FileLogWriter) SetRotateDaily(daily bool) *FileLogWriter {
//fmt.Fprintf(os.Stderr, "FileLogWriter.SetRotateDaily: %v\n", daily)
w.daily = daily
return w
}
// Set max backup files. Must be called before the first log message
// is written.
func (w *FileLogWriter) SetRotateMaxBackup(maxbackup int) *FileLogWriter {
w.maxbackup = maxbackup
return w
}
// SetRotate changes whether or not the old logs are kept. (chainable) Must be
// called before the first log message is written. If rotate is false, the
// files are overwritten; otherwise, they are rotated to another file before the
// new log is opened.
func (w *FileLogWriter) SetRotate(rotate bool) *FileLogWriter {
//fmt.Fprintf(os.Stderr, "FileLogWriter.SetRotate: %v\n", rotate)
w.rotate = rotate
return w
}
// NewXMLLogWriter is a utility method for creating a FileLogWriter set up to
// output XML record log messages instead of line-based ones.
func NewXMLLogWriter(fname string, rotate bool) *FileLogWriter {
return NewFileLogWriter(fname, rotate).SetFormat(
` <record level="%L">
<timestamp>%D %T</timestamp>
<source>%S</source>
<message>%M</message>
</record>`).SetHeadFoot("<log created=\"%D %T\">", "</log>")
}