a572876775
Merge in DNS/adguard-home from 2276-fix-lint to master Updates #2276. Squashed commit of the following: commit 433f44cc7b674a20ed60a9d29466ba888b3ef66e Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Mon Dec 7 14:14:28 2020 +0300 querylog: improve code and documentation commit 851df97d2a87de5e7180a502055ee6f1a6defdca Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Fri Dec 4 20:36:32 2020 +0300 all: fix lint and naming issues
140 lines
2.9 KiB
Go
140 lines
2.9 KiB
Go
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, 0o644)
|
|
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("querylog: 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("querylog: failed to rename file: %s", err)
|
|
return err
|
|
}
|
|
|
|
log.Debug("querylog: renamed %s -> %s", from, to)
|
|
return nil
|
|
}
|
|
|
|
func (l *queryLog) readFileFirstTimeValue() int64 {
|
|
f, err := os.Open(l.logFile)
|
|
if err != nil {
|
|
return -1
|
|
}
|
|
defer f.Close()
|
|
|
|
buf := make([]byte, 500)
|
|
r, err := f.Read(buf)
|
|
if err != nil {
|
|
return -1
|
|
}
|
|
buf = buf[:r]
|
|
|
|
val := readJSONValue(string(buf), "T")
|
|
t, err := time.Parse(time.RFC3339Nano, val)
|
|
if err != nil {
|
|
return -1
|
|
}
|
|
|
|
log.Debug("querylog: the oldest log entry: %s", val)
|
|
return t.Unix()
|
|
}
|
|
|
|
func (l *queryLog) periodicRotate() {
|
|
intervalSeconds := uint64(l.conf.Interval) * 24 * 60 * 60
|
|
for {
|
|
oldest := l.readFileFirstTimeValue()
|
|
if uint64(oldest)+intervalSeconds <= uint64(time.Now().Unix()) {
|
|
_ = l.rotate()
|
|
}
|
|
|
|
time.Sleep(24 * time.Hour)
|
|
}
|
|
}
|