AdGuardHome/querylog/querylog_file.go

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package querylog
import (
"bytes"
"encoding/json"
"os"
"time"
"github.com/AdguardTeam/golibs/log"
)
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// flushLogBuffer flushes the current buffer to file and resets the current buffer
func (l *queryLog) flushLogBuffer(fullFlush bool) error {
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 {
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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
}
}
}