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file.go
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package ulogger | |
import ( | |
"bytes" | |
"encoding/json" | |
"errors" | |
"fmt" | |
"io" | |
"os" | |
"path/filepath" | |
"strconv" | |
"strings" | |
"sync" | |
"time" | |
) | |
type fileLogger struct { | |
sync.RWMutex | |
fileWriter *os.File | |
Filename string `json:"filename"` | |
Append bool `json:"append"` | |
MaxLines int `json:"maxlines"` | |
MaxSize int `json:"maxsize"` | |
Daily bool `json:"daily"` | |
MaxDays int64 `json:"maxdays"` | |
Level string `json:"level"` | |
PermitMask string `json:"permit"` | |
LogLevel int | |
maxSizeCurSize int | |
maxLinesCurLines int | |
dailyOpenDate int | |
dailyOpenTime time.Time | |
fileNameOnly, suffix string | |
} | |
// Init file logger with json config. | |
// jsonConfig like: | |
// { | |
// "filename":"log/app.log", | |
// "maxlines":10000, | |
// "maxsize":1024, | |
// "daily":true, | |
// "maxdays":15, | |
// "rotate":true, | |
// "permit":"0600" | |
// } | |
func (f *fileLogger) Init(jsonConfig string) error { | |
fmt.Printf("fileLogger Init:%s\n", jsonConfig) | |
if len(jsonConfig) == 0 { | |
return nil | |
} | |
err := json.Unmarshal([]byte(jsonConfig), f) | |
if err != nil { | |
return err | |
} | |
if len(f.Filename) == 0 { | |
return errors.New("jsonconfig must have filename") | |
} | |
f.suffix = filepath.Ext(f.Filename) | |
f.fileNameOnly = strings.TrimSuffix(f.Filename, f.suffix) | |
f.MaxSize *= 1024 * 1024 // 将单位转换成MB | |
if f.suffix == "" { | |
f.suffix = ".log" | |
} | |
if l, ok := LevelMap[f.Level]; ok { | |
f.LogLevel = l | |
} | |
err = f.newFile() | |
return err | |
} | |
func (f *fileLogger) needCreateFresh(size int, day int) bool { | |
return (f.MaxLines > 0 && f.maxLinesCurLines >= f.MaxLines) || | |
(f.MaxSize > 0 && f.maxSizeCurSize+size >= f.MaxSize) || | |
(f.Daily && day != f.dailyOpenDate) | |
} | |
// WriteMsg write logger message into file. | |
func (f *fileLogger) LogWrite(when time.Time, msgText interface{}, level int) error { | |
msg, ok := msgText.(string) | |
if !ok { | |
return nil | |
} | |
if level > f.LogLevel { | |
return nil | |
} | |
day := when.Day() | |
msg += "\n" | |
if f.Append { | |
f.RLock() | |
if f.needCreateFresh(len(msg), day) { | |
f.RUnlock() | |
f.Lock() | |
if f.needCreateFresh(len(msg), day) { | |
if err := f.createFreshFile(when); err != nil { | |
fmt.Fprintf(os.Stderr, "createFreshFile(%q): %s\n", f.Filename, err) | |
} | |
} | |
f.Unlock() | |
} else { | |
f.RUnlock() | |
} | |
} | |
f.Lock() | |
_, err := f.fileWriter.Write([]byte(msg)) | |
if err == nil { | |
f.maxLinesCurLines++ | |
f.maxSizeCurSize += len(msg) | |
} | |
f.Unlock() | |
return err | |
} | |
func (f *fileLogger) createLogFile() (*os.File, error) { | |
// Open the log file | |
perm, err := strconv.ParseInt(f.PermitMask, 8, 64) | |
if err != nil { | |
return nil, err | |
} | |
fd, err := os.OpenFile(f.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, os.FileMode(perm)) | |
if err == nil { | |
// Make sure file perm is user set perm cause of `os.OpenFile` will obey umask | |
os.Chmod(f.Filename, os.FileMode(perm)) | |
} | |
return fd, err | |
} | |
func (f *fileLogger) newFile() error { | |
file, err := f.createLogFile() | |
if err != nil { | |
return err | |
} | |
if f.fileWriter != nil { | |
f.fileWriter.Close() | |
} | |
f.fileWriter = file | |
fInfo, err := file.Stat() | |
if err != nil { | |
return fmt.Errorf("get stat err: %s", err) | |
} | |
f.maxSizeCurSize = int(fInfo.Size()) | |
f.dailyOpenTime = time.Now() | |
f.dailyOpenDate = f.dailyOpenTime.Day() | |
f.maxLinesCurLines = 0 | |
if f.maxSizeCurSize > 0 { | |
count, err := f.lines() | |
if err != nil { | |
return err | |
} | |
f.maxLinesCurLines = count | |
} | |
return nil | |
} | |
func (f *fileLogger) lines() (int, error) { | |
fd, err := os.Open(f.Filename) | |
if err != nil { | |
return 0, err | |
} | |
defer fd.Close() | |
buf := make([]byte, 32768) // 32k | |
count := 0 | |
lineSep := []byte{'\n'} | |
for { | |
c, err := fd.Read(buf) | |
if err != nil && err != io.EOF { | |
return count, err | |
} | |
count += bytes.Count(buf[:c], lineSep) | |
if err == io.EOF { | |
break | |
} | |
} | |
return count, nil | |
} | |
// new file name like xx.2013-01-01.001.log | |
func (f *fileLogger) createFreshFile(logTime time.Time) error { | |
// file exists | |
// Find the next available number | |
num := 1 | |
fName := "" | |
rotatePerm, err := strconv.ParseInt(f.PermitMask, 8, 64) | |
if err != nil { | |
return err | |
} | |
_, err = os.Lstat(f.Filename) | |
if err != nil { | |
// 初始日志文件不存在,无需创建新文件 | |
goto RESTART_LOGGER | |
} | |
// 日期变了, 说明跨天,重命名时需要保存为昨天的日期 | |
if f.dailyOpenDate != logTime.Day() { | |
for ; err == nil && num <= 999; num++ { | |
fName = f.fileNameOnly + fmt.Sprintf(".%s.%03d%s", f.dailyOpenTime.Format("2006-01-02"), num, f.suffix) | |
_, err = os.Lstat(fName) | |
} | |
} else { //如果仅仅是文件大小或行数达到了限制,仅仅变更后缀序号即可 | |
for ; err == nil && num <= 999; num++ { | |
fName = f.fileNameOnly + fmt.Sprintf(".%s.%03d%s", logTime.Format("2006-01-02"), num, f.suffix) | |
_, err = os.Lstat(fName) | |
} | |
} | |
if err == nil { | |
return fmt.Errorf("Cannot find free log number to rename %s", f.Filename) | |
} | |
f.fileWriter.Close() | |
// 当创建新文件标记为true时 | |
// 当日志文件超过最大限制行 | |
// 当日志文件超过最大限制字节 | |
// 当日志文件隔天更新标记为true时 | |
// 将旧文件重命名,然后创建新文件 | |
err = os.Rename(f.Filename, fName) | |
if err != nil { | |
fmt.Fprintf(os.Stderr, "os.Rename %s to %s err:%s\n", f.Filename, fName, err.Error()) | |
goto RESTART_LOGGER | |
} | |
err = os.Chmod(fName, os.FileMode(rotatePerm)) | |
RESTART_LOGGER: | |
startLoggerErr := f.newFile() | |
go f.deleteOldLog() | |
if startLoggerErr != nil { | |
return fmt.Errorf("Rotate StartLogger: %s", startLoggerErr) | |
} | |
if err != nil { | |
return fmt.Errorf("Rotate: %s", err) | |
} | |
return nil | |
} | |
func (f *fileLogger) deleteOldLog() { | |
dir := filepath.Dir(f.Filename) | |
filepath.Walk(dir, func(path string, info os.FileInfo, err error) (returnErr error) { | |
defer func() { | |
if r := recover(); r != nil { | |
fmt.Fprintf(os.Stderr, "Unable to delete old log '%s', error: %v\n", path, r) | |
} | |
}() | |
if info == nil { | |
return | |
} | |
if f.MaxDays != -1 && !info.IsDir() && info.ModTime().Add(24*time.Hour*time.Duration(f.MaxDays)).Before(time.Now()) { | |
if strings.HasPrefix(filepath.Base(path), filepath.Base(f.fileNameOnly)) && | |
strings.HasSuffix(filepath.Base(path), f.suffix) { | |
os.Remove(path) | |
} | |
} | |
return | |
}) | |
} | |
func (f *fileLogger) Destroy() { | |
f.fileWriter.Close() | |
} | |
func init() { | |
Register(AdapterFile, &fileLogger{ | |
Daily: true, | |
MaxDays: 7, | |
Append: true, | |
LogLevel: LevelDebug, | |
PermitMask: "0777", | |
MaxLines: 10, | |
MaxSize: 10 * 1024 * 1024, | |
}) | |
} |
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