/
fluentbit.go
179 lines (163 loc) · 3.56 KB
/
fluentbit.go
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package log
import (
"bytes"
"errors"
"io"
"net"
"net/url"
"strconv"
"time"
"go.uber.org/zap"
)
const (
KB = 1024
MB = 1024 * KB
bufferSizeConfigKey = "buffer_size"
DefaultBufferSize = 1
)
var (
SEPARATOR = []byte("\r\n")
)
func init() {
if err := zap.RegisterSink("fluent-bit-tcp", func(url *url.URL) (zap.Sink, error) {
return newFluentBitTCPSink(url)
}); err != nil {
Fatal("RegisterSink error", err)
}
}
func newTCPConn(address string) (net.Conn, error) {
tcpAddr, err := net.ResolveTCPAddr("tcp", address)
if err != nil {
return nil, err
}
conn, err := net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
return nil, err
}
if err := conn.SetReadDeadline(time.Now()); err != nil {
return nil, err
}
return conn, nil
}
func newFluentBitTCPSink(url *url.URL) (zap.Sink, error) {
var err error
//Info("newFluentBitTCPSink", Any("url", url))
query := url.Query()
bufferSize := DefaultBufferSize
bufferSizeString := query.Get(bufferSizeConfigKey)
if bufferSizeString != "" {
bufferSize, err = strconv.Atoi(bufferSizeString)
if err != nil {
return nil, err
}
}
ws := &fluentBitTCPSink{
address: url.Host,
logC: make(chan []byte, bufferSize*MB),
buffer: bytes.Buffer{},
stopC: make(chan struct{}),
doneC: make(chan struct{}),
bufferSize: bufferSize * MB,
oneByte: make([]byte, 1),
}
go ws.serve()
return ws, nil
}
type fluentBitTCPSink struct {
address string
logC chan []byte
buffer bytes.Buffer
bufferSize int
stopC chan struct{}
doneC chan struct{}
oneByte []byte
}
func (s *fluentBitTCPSink) bufferFull() bool {
return s.buffer.Len() > s.bufferSize
}
func (s *fluentBitTCPSink) Write(p []byte) (n int, err error) {
if len(s.logC) >= s.bufferSize {
return 0, errors.New("buffer full")
}
data := make([]byte, len(p))
copy(data, p)
s.logC <- data
return len(p), nil
}
func (s *fluentBitTCPSink) sendData(doneC chan<- struct{}) {
if s.buffer.Len() > 0 {
conn, err := newTCPConn(s.address)
if err != nil {
Error("new tcp conn error", err)
goto DONE
}
defer conn.Close()
// Check server close wait
// In go 1.7+, zero byte reads return immediately and will never return an error.
// You must read at least one byte.
if _, err := conn.Read(s.oneByte); err == io.EOF {
Error("connection closed", nil)
goto DONE
}
if _, err := conn.Write(s.buffer.Bytes()); err != nil {
Error("write data error", err)
goto DONE
}
Debug("send success")
s.buffer.Reset()
}
DONE:
doneC <- struct{}{}
}
func (s *fluentBitTCPSink) trySendData() {
Debug("try send data")
sendDataTimer := time.NewTimer(5 * time.Second)
defer sendDataTimer.Stop()
doneC := make(chan struct{})
go s.sendData(doneC)
select {
case <-doneC:
break
case <-sendDataTimer.C:
Error("send data timeout", nil)
}
if s.bufferFull() {
Debug("buffer reset")
s.buffer.Reset()
}
}
func (s *fluentBitTCPSink) serve() {
//Info("fluentBitTCPSink serving")
trySendDataTicker := time.NewTicker(5 * time.Second)
defer trySendDataTicker.Stop()
for {
select {
case <-trySendDataTicker.C:
s.trySendData()
case data := <-s.logC:
s.buffer.Write(data)
s.buffer.Write(SEPARATOR)
if s.buffer.Len() > 512*KB {
s.trySendData()
}
case <-s.stopC:
s.trySendData()
close(s.doneC)
close(s.logC)
return
}
}
}
func (s *fluentBitTCPSink) Sync() error {
return s.Close()
}
func (s *fluentBitTCPSink) Close() error {
//Info("fluentBitTCPSink closing")
select {
case s.stopC <- struct{}{}:
case <-s.doneC:
return nil
}
<-s.doneC
return nil
}