/
dateformat.go
250 lines (199 loc) · 4.49 KB
/
dateformat.go
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// dateformat
// @author LanguageY++2013 2023/5/10 09:36
// @company soulgame
package dateformat
import (
"fmt"
"os"
"sync"
"time"
"strings"
"errors"
"sort"
"path/filepath"
"log"
)
const (
timeFormat = "2006010215"
)
type Configure struct {
//Dir 日志文件目录
Dir string `json:"dir"`
//Prefix 文件名前缀
Prefix string `json:"prefix"`
//MaxAge 日志保留天数
MaxAge int `json:"maxage"`
}
type Logger struct {
Configure
file *os.File
mu sync.Mutex
millCh chan bool
startMill sync.Once
}
func NewLogger(cfg Configure) *Logger {
l := &Logger{
Configure:cfg,
}
return l
}
func (l *Logger) Write(p []byte) (n int, err error) {
l.mu.Lock()
defer l.mu.Unlock()
//文件为空,或者文件名发生变更(时间format划分)
if l.file == nil || l.file.Name() != l.filename() {
if err = l.openExistingOrNew(); err != nil {
return
}
}
n, err = l.file.Write(p)
return
}
func (l *Logger) Sync() error {
return nil
}
func(l *Logger) Close() error {
l.mu.Lock()
defer l.mu.Unlock()
return l.close()
}
func(l *Logger) close() error {
if l.file != nil {
return l.file.Close()
}
l.file = nil
return nil
}
func (l *Logger) openExistingOrNew() (err error) {
l.mill()
filename := l.filename()
_, err = os.Stat(filename)
if os.IsNotExist(err) {
return l.openNew()
}
if err != nil {
return fmt.Errorf("error getting log file info: %s", err)
}
//打开已有文件
file, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
// if we fail to open the old log file for some reason, just ignore
// it and open a new log file.
return l.openNew()
}
l.file = file
return
}
func (l *Logger) filename() string {
dateformat := time.Now().Format(timeFormat)
if l.Prefix == "" {
return fmt.Sprintf("%s/%s.log", l.Dir, dateformat)
}
return fmt.Sprintf("%s/%s-%s.log", l.Dir, l.Prefix, dateformat)
}
func (l *Logger) openNew() error {
err := os.MkdirAll(l.Dir, os.ModePerm)
if err != nil {
return fmt.Errorf("can't make directorie %s : %s", l.Dir, err)
}
filename := l.filename()
file, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("can't open new logfile: %s", err)
}
l.file = file
return nil
}
//发送旧日志的移除的信号,首次触发时创建信息接收处理协程
func (l *Logger) mill() {
l.startMill.Do(func() {
l.millCh = make(chan bool, 1)
go l.millRun()
})
select {
case l.millCh <- true:
default:
}
}
func (l *Logger) millRun() {
for range l.millCh {
err := l.millRunOnce()
if err != nil {
log.Printf("mill run once err %s\n", err)
}
}
}
//旧日志移除处理
func (l *Logger) millRunOnce() error {
files, err := l.oldLogFiles()
if err != nil {
return err
}
var remove []logInfo
if l.MaxAge > 0 {
diff := time.Duration(int64(24*time.Hour) * int64(l.MaxAge))
cutoff := time.Now().Add(-1 * diff)
for _, f := range files {
if f.timestamp.Before(cutoff) {
remove = append(remove, f)
}
}
}
for _, f := range remove {
errRemove := os.Remove(filepath.Join(l.Dir, f.Name()))
if err == nil && errRemove != nil {
err = errRemove
}
}
return err
}
func (l *Logger) oldLogFiles() ([]logInfo, error) {
files, err := os.ReadDir(l.Dir)
if err != nil {
return nil, fmt.Errorf("can't read log file directory: %s", err)
}
logFiles := []logInfo{}
prefix := ""
if l.Prefix != "" {
prefix = l.Prefix + "-"
}
ext := ".log"
for _, f := range files {
if f.IsDir() {
continue
}
if t, err := l.timeFromName(f.Name(), prefix, ext); err == nil {
logFiles = append(logFiles, logInfo{t, f})
continue
}
}
sort.Sort(byFormatTime(logFiles))
return logFiles, nil
}
func (l *Logger) timeFromName(filename, prefix, ext string) (time.Time, error) {
if prefix != "" && !strings.HasPrefix(filename, prefix) {
return time.Time{}, errors.New("mismatched prefix")
}
if !strings.HasSuffix(filename, ext) {
return time.Time{}, errors.New("mismatched extension")
}
ts := filename[len(prefix) : len(filename)-len(ext)]
return time.Parse(timeFormat, ts)
}
// logInfo is a convenience struct to return the filename and its embedded
// timestamp.
type logInfo struct {
timestamp time.Time
os.DirEntry
}
// byFormatTime sorts by newest time formatted in the name.
type byFormatTime []logInfo
func (b byFormatTime) Less(i, j int) bool {
return b[i].timestamp.After(b[j].timestamp)
}
func (b byFormatTime) Swap(i, j int) {
b[i], b[j] = b[j], b[i]
}
func (b byFormatTime) Len() int {
return len(b)
}