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package timber
import (
// This should write to anything that you can write to with net.Dial
type SocketWriter struct {
conn net.Conn
network string
addr string
connSync *sync.RWMutex
restartOnce *sync.Once
Timeout time.Duration
func NewSocketWriter(network, addr string) (*SocketWriter, error) {
conn, err := net.Dial(network, addr)
if err != nil {
return nil, err
timeout := 5 * time.Millisecond // logging should be fast
return &SocketWriter{conn, network, addr, &sync.RWMutex{}, &sync.Once{}, timeout}, nil
func (sw *SocketWriter) LogWrite(msg string) {
// Starting with go1.1 (currently tested on go1.1.1)
// writing to /dev/log on linux with rsyslog will occasionally
// return EAGAIN. Unfortunately, the go socket code does
// a blocking wait which never returns when it gets an EAGAIN,
// so a timeout is necessary to unblock. I tested and a reconnect
// is not necessary when this happens but I think the code is more
// general this way so I'm leaving the reconnect on all errors.
_, err := sw.conn.Write([]byte(msg))
if err != nil {
fmt.Printf("Socket logging error: %v\n", err)
sw.restartOnce.Do(func() {
go sw.reconnect()
func (sw *SocketWriter) reconnect() {
for {
conn, err := net.Dial(, sw.addr)
if err == nil {
sw.conn = conn
sw.restartOnce = &sync.Once{}
time.Sleep(100 * time.Millisecond)
func (sw *SocketWriter) Close() {
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