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elastic_cron/syslog.go

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2016-02-26 17:44:10 +00:00
package main
import (
"bytes"
"fmt"
"io"
"net"
"time"
"github.com/cenkalti/backoff"
)
const (
readWriteTimeout = 1 * time.Second
tcpDialTimeout = 5 * time.Second
)
func NewSyslogAdapter(address string) (*SyslogAdapter, error) {
return &SyslogAdapter{
address: address,
dialer: &net.Dialer{
Timeout: tcpDialTimeout,
},
}, nil
}
type message struct {
Date time.Time
JobName string
Message string
Severity int
}
type SyslogAdapter struct {
address string
dialer *net.Dialer
}
func (a *SyslogAdapter) Stream(logstream chan *message) {
backoff.Retry(func() error {
conn, err := a.dialer.Dial("tcp", a.address)
if err != nil {
fmt.Printf("syslog: Unable to dial to remote address\n")
return fmt.Errorf("Catch me if you can.")
}
defer conn.Close()
b := new(bytes.Buffer)
for msg := range logstream {
b.Reset()
fmt.Fprintf(b, "<%d>%s %s %s: %s\n",
16*8+msg.Severity,
msg.Date.Format("Jan 02 15:04:05"),
cfg.Hostname,
msg.JobName,
msg.Message,
)
if err := conn.SetDeadline(time.Now().Add(readWriteTimeout)); err != nil {
fmt.Printf("syslog: Unable to set deadline: %s\n", err)
return fmt.Errorf("Catch me if you can.")
}
logLine := b.Bytes()
written, err := io.Copy(conn, b)
if err != nil {
if written > 0 {
fmt.Printf("syslog: (%d/%d) %s\n", written, len(logLine), err)
} else {
fmt.Printf("syslog: %s\n", err)
}
return fmt.Errorf("syslog: %s", err)
}
}
fmt.Printf("syslog: I got out of the channel watch. This should never happen.\n")
return fmt.Errorf("Wat? Why am I here?")
}, &backoff.ZeroBackOff{})
}