92 lines
2.0 KiB
Go
92 lines
2.0 KiB
Go
// Package logdaily 提供按天滚动的日志写入器（供 go-zero logx.SetWriter 使用）
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package logdaily
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import (
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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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type dailyWriter struct {
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mu sync.Mutex
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dir string
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base string
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keepDays int
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date string
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f *os.File
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}
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// New 创建按天滚动的写入器：文件名 dir/base-2006-01-02.log，跨天自动切换，
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// 超过 keepDays 天的旧日志在跨天时清理（keepDays<=0 表示永久保留）。
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func New(dir, base string, keepDays int) io.WriteCloser {
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return &dailyWriter{dir: dir, base: base, keepDays: keepDays}
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}
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func (w *dailyWriter) filename(date string) string {
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return filepath.Join(w.dir, w.base+"-"+date+".log")
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}
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func (w *dailyWriter) Write(p []byte) (int, error) {
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w.mu.Lock()
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defer w.mu.Unlock()
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today := time.Now().Format("2006-01-02")
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if w.f == nil || today != w.date {
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if w.f != nil {
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_ = w.f.Close()
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}
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if err := os.MkdirAll(w.dir, 0o755); err != nil {
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return 0, err
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}
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f, err := os.OpenFile(w.filename(today), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
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if err != nil {
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return 0, err
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}
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w.f = f
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w.date = today
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w.cleanup()
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}
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return w.f.Write(p)
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}
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func (w *dailyWriter) Close() error {
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w.mu.Lock()
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defer w.mu.Unlock()
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if w.f != nil {
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return w.f.Close()
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}
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return nil
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}
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func (w *dailyWriter) cleanup() {
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if w.keepDays <= 0 {
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return
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}
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entries, err := os.ReadDir(w.dir)
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if err != nil {
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return
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}
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cutoff := time.Now().AddDate(0, 0, -w.keepDays)
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for _, e := range entries {
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if e.IsDir() || !strings.HasPrefix(e.Name(), w.base+"-") || !strings.HasSuffix(e.Name(), ".log") {
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continue
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}
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datePart := strings.TrimSuffix(strings.TrimPrefix(e.Name(), w.base+"-"), ".log")
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t, err := time.ParseInLocation("2006-01-02", datePart, time.Local)
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if err != nil {
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continue
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}
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if t.Before(cutoff) {
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_ = os.Remove(filepath.Join(w.dir, e.Name()))
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}
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}
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}
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var (
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_ io.WriteCloser = (*dailyWriter)(nil)
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_ io.Writer = (*dailyWriter)(nil)
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)
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