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syslog.go
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syslog.go
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// +build linux
package syslog
import (
"io"
"log/syslog"
"net"
"net/url"
"os"
"path"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/pkg/urlutil"
)
const name = "syslog"
type Syslog struct {
writer *syslog.Writer
}
func init() {
if err := logger.RegisterLogDriver(name, New); err != nil {
logrus.Fatal(err)
}
}
func New(ctx logger.Context) (logger.Logger, error) {
tag := ctx.ContainerID[:12]
proto, address, err := parseAddress(ctx.Config["syslog-address"])
if err != nil {
return nil, err
}
log, err := syslog.Dial(
proto,
address,
syslog.LOG_DAEMON,
path.Base(os.Args[0])+"/"+tag,
)
if err != nil {
return nil, err
}
return &Syslog{
writer: log,
}, nil
}
func (s *Syslog) Log(msg *logger.Message) error {
if msg.Source == "stderr" {
return s.writer.Err(string(msg.Line))
}
return s.writer.Info(string(msg.Line))
}
func (s *Syslog) Close() error {
return s.writer.Close()
}
func (s *Syslog) Name() string {
return name
}
func (s *Syslog) GetReader() (io.Reader, error) {
return nil, logger.ReadLogsNotSupported
}
func parseAddress(address string) (string, string, error) {
if urlutil.IsTransportURL(address) {
url, err := url.Parse(address)
if err != nil {
return "", "", err
}
// unix socket validation
if url.Scheme == "unix" {
if _, err := os.Stat(url.Path); err != nil {
return "", "", err
}
return url.Scheme, url.Path, nil
}
// here we process tcp|udp
host := url.Host
if _, _, err := net.SplitHostPort(host); err != nil {
if !strings.Contains(err.Error(), "missing port in address") {
return "", "", err
}
host = host + ":514"
}
return url.Scheme, host, nil
}
return "", "", nil
}