package querylog import ( "bytes" "encoding/json" "os" "time" "github.com/AdguardTeam/golibs/log" ) // flushLogBuffer flushes the current buffer to file and resets the current buffer func (l *queryLog) flushLogBuffer(fullFlush bool) error { if !l.conf.FileEnabled { return nil } l.fileFlushLock.Lock() defer l.fileFlushLock.Unlock() // flush remainder to file l.bufferLock.Lock() needFlush := len(l.buffer) >= int(l.conf.MemSize) if !needFlush && !fullFlush { l.bufferLock.Unlock() return nil } flushBuffer := l.buffer l.buffer = nil l.flushPending = false l.bufferLock.Unlock() err := l.flushToFile(flushBuffer) if err != nil { log.Error("Saving querylog to file failed: %s", err) return err } return nil } // flushToFile saves the specified log entries to the query log file func (l *queryLog) flushToFile(buffer []*logEntry) error { if len(buffer) == 0 { log.Debug("querylog: there's nothing to write to a file") return nil } start := time.Now() var b bytes.Buffer e := json.NewEncoder(&b) for _, entry := range buffer { err := e.Encode(entry) if err != nil { log.Error("Failed to marshal entry: %s", err) return err } } elapsed := time.Since(start) log.Debug("%d elements serialized via json in %v: %d kB, %v/entry, %v/entry", len(buffer), elapsed, b.Len()/1024, float64(b.Len())/float64(len(buffer)), elapsed/time.Duration(len(buffer))) var err error var zb bytes.Buffer filename := l.logFile zb = b l.fileWriteLock.Lock() defer l.fileWriteLock.Unlock() f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644) if err != nil { log.Error("failed to create file \"%s\": %s", filename, err) return err } defer f.Close() n, err := f.Write(zb.Bytes()) if err != nil { log.Error("Couldn't write to file: %s", err) return err } log.Debug("ok \"%s\": %v bytes written", filename, n) return nil } func (l *queryLog) rotate() error { from := l.logFile to := l.logFile + ".1" if _, err := os.Stat(from); os.IsNotExist(err) { // do nothing, file doesn't exist return nil } err := os.Rename(from, to) if err != nil { log.Error("Failed to rename querylog: %s", err) return err } log.Debug("Rotated from %s to %s successfully", from, to) return nil } func (l *queryLog) periodicRotate() { for range time.Tick(time.Duration(l.conf.Interval) * 24 * time.Hour) { err := l.rotate() if err != nil { log.Error("Failed to rotate querylog: %s", err) // do nothing, continue rotating } } }