135 lines
2.6 KiB
Go
135 lines
2.6 KiB
Go
package log
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"sync"
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)
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type baseWriter struct {
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logw *os.File
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stdw *os.File
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errw *os.File
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logFilename string
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logPreBackupTag string
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}
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type cacheWriter struct {
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cache bytes.Buffer
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cacheing bool
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cacheLock *sync.Mutex
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baseWriter io.Writer
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}
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func NewBaseWriter(logw, stdw, errw *os.File) *baseWriter {
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return &baseWriter{
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logw: logw,
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stdw: stdw,
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errw: errw,
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}
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}
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// OpenLogFile
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func (w *baseWriter) OpenLogFile(logDir, logName string, optLogDirs []string) {
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// Step 1. try get available log dir
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if _, err := os.Stat(logDir); err == nil {
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logDir = logDir
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} else if dir, err := tryOptLogDirs(optLogDirs); err == nil {
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logDir = dir
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} else if err := os.Mkdir(logDir, 0755); err == nil {
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logDir = logDir
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} else {
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errstr := fmt.Sprintf("all path not exist:\n "+
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"a.[%s]\n b.[%s]\n c.[%s]\n",
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logDir, "./log/", "./logs/")
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panic("failed initlog:" + errstr)
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}
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// Step 2. open base writer logfile
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filename := filepath.Join(logDir, logName+".log")
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w.logFilename = filename
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w.logPreBackupTag = ""
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w.ReopenLogFile()
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}
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// ReopenLogFile
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func (w *baseWriter) ReopenLogFile() {
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var fil, err = os.OpenFile(w.logFilename,
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os.O_APPEND|os.O_CREATE|os.O_WRONLY, os.ModePerm)
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if err != nil {
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panic("open log file failed:" + err.Error())
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}
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w.logw.Close()
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w.logw = fil
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}
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// BackupLogFile
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func (w *baseWriter) TryBackupLogFile(tag string) bool {
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if w.logPreBackupTag == "" {
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w.logPreBackupTag = tag
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return false
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} else if w.logPreBackupTag == tag {
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return false
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}
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w.logPreBackupTag = tag
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newname := w.logFilename + "." + tag
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if err := os.Rename(w.logFilename, newname); err != nil {
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return false
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}
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w.ReopenLogFile()
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return true
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}
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func NewCacheWriter(basewriter io.Writer) *cacheWriter {
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return &cacheWriter{
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cache: bytes.Buffer{},
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cacheing: false,
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cacheLock: new(sync.Mutex),
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baseWriter: basewriter,
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}
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}
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func (w *baseWriter) Write(p []byte) (n int, err error) {
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if w.errw != nil {
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n, err = w.errw.Write(p)
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}
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if w.stdw != nil {
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n, err = w.stdw.Write(p)
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}
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if w.logw != nil {
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n, err = w.logw.Write(p)
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}
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return n, err
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}
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func (w *cacheWriter) Write(p []byte) (n int, err error) {
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if w.cacheing {
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w.cache.Write(p)
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}
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return w.baseWriter.Write(p)
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}
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func (w *cacheWriter) GetCacheLog() string {
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if w.cacheing != true {
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panic("GetCacheLog MUST call after StartCacheLog called")
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}
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return w.cache.String()
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}
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func (w *cacheWriter) StartCacheLog() {
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w.cacheLock.Lock()
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w.cacheing = true
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w.cache.Reset()
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}
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func (w *cacheWriter) StopCacheLog() {
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w.cacheLock.Unlock()
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w.cacheing = false
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}
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