140 lines
2.9 KiB
Go
140 lines
2.9 KiB
Go
package querylog
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import (
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"bytes"
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"encoding/json"
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"os"
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"time"
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"github.com/AdguardTeam/golibs/log"
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)
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// flushLogBuffer flushes the current buffer to file and resets the current buffer
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func (l *queryLog) flushLogBuffer(fullFlush bool) error {
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if !l.conf.FileEnabled {
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return nil
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}
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l.fileFlushLock.Lock()
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defer l.fileFlushLock.Unlock()
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// flush remainder to file
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l.bufferLock.Lock()
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needFlush := len(l.buffer) >= int(l.conf.MemSize)
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if !needFlush && !fullFlush {
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l.bufferLock.Unlock()
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return nil
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}
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flushBuffer := l.buffer
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l.buffer = nil
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l.flushPending = false
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l.bufferLock.Unlock()
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err := l.flushToFile(flushBuffer)
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if err != nil {
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log.Error("Saving querylog to file failed: %s", err)
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return err
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}
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return nil
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}
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// flushToFile saves the specified log entries to the query log file
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func (l *queryLog) flushToFile(buffer []*logEntry) error {
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if len(buffer) == 0 {
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log.Debug("querylog: there's nothing to write to a file")
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return nil
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}
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start := time.Now()
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var b bytes.Buffer
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e := json.NewEncoder(&b)
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for _, entry := range buffer {
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err := e.Encode(entry)
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if err != nil {
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log.Error("Failed to marshal entry: %s", err)
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return err
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}
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}
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elapsed := time.Since(start)
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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)))
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var err error
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var zb bytes.Buffer
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filename := l.logFile
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zb = b
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l.fileWriteLock.Lock()
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defer l.fileWriteLock.Unlock()
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f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
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if err != nil {
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log.Error("failed to create file \"%s\": %s", filename, err)
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return err
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}
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defer f.Close()
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n, err := f.Write(zb.Bytes())
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if err != nil {
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log.Error("Couldn't write to file: %s", err)
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return err
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}
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log.Debug("querylog: ok \"%s\": %v bytes written", filename, n)
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return nil
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}
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func (l *queryLog) rotate() error {
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from := l.logFile
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to := l.logFile + ".1"
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if _, err := os.Stat(from); os.IsNotExist(err) {
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// do nothing, file doesn't exist
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return nil
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}
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err := os.Rename(from, to)
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if err != nil {
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log.Error("querylog: failed to rename file: %s", err)
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return err
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}
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log.Debug("querylog: renamed %s -> %s", from, to)
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return nil
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}
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func (l *queryLog) readFileFirstTimeValue() int64 {
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f, err := os.Open(l.logFile)
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if err != nil {
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return -1
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}
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defer f.Close()
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buf := make([]byte, 500)
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r, err := f.Read(buf)
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if err != nil {
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return -1
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}
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buf = buf[:r]
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val := readJSONValue(string(buf), "T")
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t, err := time.Parse(time.RFC3339Nano, val)
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if err != nil {
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return -1
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}
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log.Debug("querylog: the oldest log entry: %s", val)
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return t.Unix()
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}
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func (l *queryLog) periodicRotate() {
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intervalSeconds := uint64(l.conf.Interval) * 24 * 60 * 60
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for {
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oldest := l.readFileFirstTimeValue()
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if uint64(oldest)+intervalSeconds <= uint64(time.Now().Unix()) {
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_ = l.rotate()
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}
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time.Sleep(24 * time.Hour)
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}
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}
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