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journal.go
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journal.go
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// +build linux
package log
import (
"bytes"
"encoding/binary"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"strings"
"sync"
"syscall"
"unsafe"
)
// JournalWriter is an io.WriteCloser that writes logs to journald.
type JournalWriter struct {
// JournalSocket specifies socket name, using `/run/systemd/journal/socket` if empty.
JournalSocket string
once sync.Once
addr *net.UnixAddr
conn *net.UnixConn
}
// Close implements io.Closer.
func (w *JournalWriter) Close() (err error) {
if w.conn != nil {
err = w.conn.Close()
}
return
}
// Write implements io.Writer.
func (w *JournalWriter) Write(p []byte) (n int, err error) {
w.once.Do(func() {
// unix addr
w.addr = &net.UnixAddr{
Net: "unixgram",
Name: w.JournalSocket,
}
if w.addr.Name == "" {
w.addr.Name = "/run/systemd/journal/socket"
}
// unix conn
var autobind *net.UnixAddr
autobind, err = net.ResolveUnixAddr("unixgram", "")
if err != nil {
return
}
w.conn, err = net.ListenUnixgram("unixgram", autobind)
})
if err != nil {
return
}
var m map[string]interface{}
decoder := json.NewDecoder(bytes.NewReader(p))
decoder.UseNumber()
err = decoder.Decode(&m)
if err != nil {
return
}
// buffer
b := bbpool.Get().(*bb)
b.Reset()
defer bbpool.Put(b)
print := func(w io.Writer, name, value string) {
if strings.ContainsRune(value, '\n') {
fmt.Fprintln(w, name)
binary.Write(w, binary.LittleEndian, uint64(len(value)))
fmt.Fprintln(w, value)
} else {
fmt.Fprintf(w, "%s=%s\n", name, value)
}
}
// level
if v, ok := m["level"]; ok {
var priority string
switch s, _ := v.(string); ParseLevel(s) {
case TraceLevel:
priority = "7" // Debug
case DebugLevel:
priority = "7" // Debug
case InfoLevel:
priority = "6" // Informational
case WarnLevel:
priority = "4" // Warning
case ErrorLevel:
priority = "3" // Error
case FatalLevel:
priority = "2" // Critical
case PanicLevel:
priority = "0" // Emergency
default:
priority = "5" // Notice
}
print(b, "PRIORITY", priority)
}
// message
var msgField = "message"
if _, ok := m[msgField]; !ok {
if _, ok := m["msg"]; ok {
msgField = "msg"
}
}
if v, ok := m[msgField]; ok {
s, _ := v.(string)
if s != "" && s[len(s)-1] == '\n' {
s = s[:len(s)-1]
}
print(b, "MESSAGE", s)
}
// fields
for k, v := range m {
switch k {
case "level", "time", msgField:
continue
}
s, ok := v.(string)
if !ok {
s = fmt.Sprint(v)
}
print(b, strings.ToUpper(k), s)
}
print(b, "JSON", *(*string)(unsafe.Pointer(&p)))
// write
n, _, err = w.conn.WriteMsgUnix(b.B, nil, w.addr)
if err == nil {
return
}
opErr, ok := err.(*net.OpError)
if !ok || opErr == nil {
return
}
sysErr, ok := opErr.Err.(*os.SyscallError)
if !ok || sysErr == nil {
return
}
if sysErr.Err != syscall.EMSGSIZE && sysErr.Err != syscall.ENOBUFS {
return
}
// Large log entry, send it via tempfile and ancillary-fd.
var file *os.File
file, err = ioutil.TempFile("/dev/shm/", "journal.XXXXX")
if err != nil {
return
}
err = syscall.Unlink(file.Name())
if err != nil {
return
}
defer file.Close()
n, err = file.Write(b.B)
if err != nil {
return
}
rights := syscall.UnixRights(int(file.Fd()))
_, _, err = w.conn.WriteMsgUnix([]byte{}, rights, w.addr)
if err == nil {
n = len(p)
}
return
}