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glog.go
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glog.go
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package glog
import (
"bytes"
"fmt"
"io"
"os"
"runtime"
"strings"
"sync"
"time"
"github.com/winterssy/bufferpool"
)
// Logging output level.
const (
Ldebug = iota
Linfo
Lwarn
Lerror
Lpanic
Lfatal
)
var levels = [...]string{
"DEBUG",
"INFO",
"WARN",
"ERROR",
"PANIC",
"FATAL",
}
// These flags define which text to prefix to each log entry generated by the Logger.
// Bits are or'ed together to control what's printed.
// There is no control over the order they appear (the order listed
// here) or the format they present (as described in the comments).
// The prefix is followed by a colon only when Llongfile or Lshortfile
// is specified.
// For example, flags Ldate | Ltime (or LstdFlags) produce,
// 2009-01-23 01:23:23 [level] message
// while flags Ldate | Ltime | Lmilliseconds | Llongfile produce,
// 2009-01-23 01:23:23,123 [level] /a/b/c/d.go:23: message
const (
Ldate = 1 << iota // the date in the local time zone: 2009-01-23
Ltime // the time in the local time zone: 01:23:23
Lmilliseconds // millisecond resolution: 01:23:23,123. assumes Ltime.
Llongfile // full file name and line number: /a/b/c/d.go:23
Lshortfile // package file name element and line number: package/d.go:23. overrides Llongfile
LUTC // if Ldate or Ltime is set, use UTC rather than the local time zone
Lmsgprefix // move the "prefix" from the beginning of the line to before the message
LstdFlags = Ldate | Ltime | Lmilliseconds // initial values for the standard logger
)
// A Logger represents an active logging object that generates lines of
// output to an io.Writer. Each logging operation makes a single call to
// the Writer's Write method. A Logger can be used simultaneously from
// multiple goroutines; it guarantees to serialize access to the Writer.
type Logger struct {
prefix string // prefix to write at beginning of each line
flag int // properties
level int // output level
out io.Writer // destination for output
mu sync.Mutex // ensures atomic writes
}
var _globalL = New(os.Stderr, "", LstdFlags, Linfo)
// New creates a new Logger. The out variable sets the
// destination to which log data will be written.
// The prefix appears at the beginning of each generated log line.
// The flag argument defines the logging properties.
// The level argument defines the logging output level.
func New(out io.Writer, prefix string, flag int, level int) *Logger {
return &Logger{out: out, prefix: prefix, flag: flag, level: level}
}
// ReplaceGlobal replaces the global Logger.
func ReplaceGlobal(logger *Logger) {
_globalL = logger
}
// Cheap integer to fixed-width decimal ASCII. Give a negative width to avoid zero-padding.
func itoa(buf *bytes.Buffer, i int, wid int) {
// Assemble decimal in reverse order.
var b [20]byte
bp := len(b) - 1
for i >= 10 || wid > 1 {
wid--
q := i / 10
b[bp] = byte('0' + i - q*10)
bp--
i = q
}
// i < 10
b[bp] = byte('0' + i)
buf.Write(b[bp:])
}
func trimmedPath(filename string) string {
idx := strings.LastIndexByte(filename, '/')
if idx == -1 {
return filename
}
// Find the penultimate separator.
idx = strings.LastIndexByte(filename[:idx], '/')
if idx == -1 {
return filename
}
return filename[idx+1:]
}
// formatHeader writes log header to buf in following order:
// * l.prefix (if it's not blank),
// * date and/or time (if corresponding flags are provided),
// * l.level,
// * file and line number (if corresponding flags are provided).
func (l *Logger) formatHeader(buf *bytes.Buffer, t time.Time, file string, line int, level int) {
if l.flag&Lmsgprefix == 0 {
buf.WriteString(l.prefix)
}
if l.flag&(Ldate|Ltime|Lmilliseconds) != 0 {
if l.flag&LUTC != 0 {
t = t.UTC()
}
if l.flag&Ldate != 0 {
year, month, day := t.Date()
itoa(buf, year, 4)
buf.WriteByte('-')
itoa(buf, int(month), 2)
buf.WriteByte('-')
itoa(buf, day, 2)
buf.WriteByte(' ')
}
if l.flag&(Ltime|Lmilliseconds) != 0 {
hour, min, sec := t.Clock()
itoa(buf, hour, 2)
buf.WriteByte(':')
itoa(buf, min, 2)
buf.WriteByte(':')
itoa(buf, sec, 2)
if l.flag&Lmilliseconds != 0 {
buf.WriteByte(',')
itoa(buf, t.Nanosecond()/1e6, 3)
}
buf.WriteByte(' ')
}
}
// format message level
buf.WriteString("[" + levels[level] + "]")
buf.WriteByte(' ')
if l.flag&(Lshortfile|Llongfile) != 0 {
if l.flag&Lshortfile != 0 {
file = trimmedPath(file)
}
buf.WriteString(file)
buf.WriteByte(':')
itoa(buf, line, -1)
buf.WriteByte(' ')
}
if l.flag&Lmsgprefix != 0 {
buf.WriteString(l.prefix)
}
}
// atomic write.
func (l *Logger) write(b []byte) (int, error) {
l.mu.Lock()
defer l.mu.Unlock()
return l.out.Write(b)
}
// Output writes the output for a logging event.
// The string msg contains the text to print after the prefix specified by the flags of the Logger.
// A newline is appended if the last character of s is not already a newline.
// The level argument specifies the log message level.
// The calldepth argument specifies the count of the number of frames to skip
// when computing the file name and line number if Llongfile or Lshortfile is set.
func (l *Logger) Output(level int, calldepth int, msg string) error {
now := time.Now() // get this early.
var file string
var line int
if l.flag&(Lshortfile|Llongfile) != 0 {
var ok bool
_, file, line, ok = runtime.Caller(calldepth)
if !ok {
file = "???"
line = 0
}
}
buf := bufferpool.Get()
defer buf.Free()
l.formatHeader(buf.Buffer, now, file, line, level)
buf.WriteString(msg)
if len(msg) == 0 || msg[len(msg)-1] != '\n' {
buf.WriteByte('\n')
}
_, err := l.write(buf.Bytes())
return err
}
// Debug uses fmt.Sprintln to construct and log a message.
func (l *Logger) Debug(v ...interface{}) {
if Ldebug >= l.level {
l.Output(Ldebug, 2, fmt.Sprintln(v...))
}
}
// Debugf uses fmt.Sprintf to construct and log a message.
func (l *Logger) Debugf(format string, v ...interface{}) {
if Ldebug >= l.level {
l.Output(Ldebug, 2, fmt.Sprintf(format, v...))
}
}
// Info uses fmt.Sprintln to construct and log a message.
func (l *Logger) Info(v ...interface{}) {
if Linfo >= l.level {
l.Output(Linfo, 2, fmt.Sprintln(v...))
}
}
// Infof uses fmt.Sprintf to construct and log a message.
func (l *Logger) Infof(format string, v ...interface{}) {
if Linfo >= l.level {
l.Output(Linfo, 2, fmt.Sprintf(format, v...))
}
}
// Warn uses fmt.Sprintln to construct and log a message.
func (l *Logger) Warn(v ...interface{}) {
if Lwarn >= l.level {
l.Output(Lwarn, 2, fmt.Sprintln(v...))
}
}
// Warnf uses fmt.Sprintf to construct and log a message.
func (l *Logger) Warnf(format string, v ...interface{}) {
if Lwarn >= l.level {
l.Output(Lwarn, 2, fmt.Sprintf(format, v...))
}
}
// Error uses fmt.Sprintln to construct and log a message.
func (l *Logger) Error(v ...interface{}) {
if Lerror >= l.level {
l.Output(Lerror, 2, fmt.Sprintln(v...))
}
}
// Errorf uses fmt.Sprintf to construct and log a message.
func (l *Logger) Errorf(format string, v ...interface{}) {
if Lerror >= l.level {
l.Output(Lerror, 2, fmt.Sprintf(format, v...))
}
}
// Panic uses fmt.Sprintln to construct and log a message, then panics.
func (l *Logger) Panic(v ...interface{}) {
msg := fmt.Sprintln(v...)
if Lpanic >= l.level {
l.Output(Lpanic, 2, msg)
}
panic(msg)
}
// Panicf uses fmt.Sprintf to construct and log a message, then panics.
func (l *Logger) Panicf(format string, v ...interface{}) {
msg := fmt.Sprintf(format, v...)
if Lpanic >= l.level {
l.Output(Lpanic, 2, msg)
}
panic(msg)
}
// Fatal uses fmt.Sprintln to construct and log a message, then calls os.Exit(1).
func (l *Logger) Fatal(v ...interface{}) {
if Lfatal >= l.level {
l.Output(Lfatal, 2, fmt.Sprintln(v...))
}
os.Exit(1)
}
// Fatalf uses fmt.Sprintf to construct and log a message, then calls os.Exit(1).
func (l *Logger) Fatalf(format string, v ...interface{}) {
if Lfatal >= l.level {
l.Output(Lfatal, 2, fmt.Sprintf(format, v...))
}
os.Exit(1)
}
// Debug uses fmt.Sprintln to construct and log a message.
func Debug(v ...interface{}) {
if Ldebug >= _globalL.level {
_globalL.Output(Ldebug, 2, fmt.Sprintln(v...))
}
}
// Debugf uses fmt.Sprintf to construct and log a message.
func Debugf(format string, v ...interface{}) {
if Ldebug >= _globalL.level {
_globalL.Output(Ldebug, 2, fmt.Sprintf(format, v...))
}
}
// Info uses fmt.Sprintln to construct and log a message.
func Info(v ...interface{}) {
if Linfo >= _globalL.level {
_globalL.Output(Linfo, 2, fmt.Sprintln(v...))
}
}
// Infof uses fmt.Sprintf to construct and log a message.
func Infof(format string, v ...interface{}) {
if Linfo >= _globalL.level {
_globalL.Output(Linfo, 2, fmt.Sprintf(format, v...))
}
}
// Warn uses fmt.Sprintln to construct and log a message.
func Warn(v ...interface{}) {
if Lwarn >= _globalL.level {
_globalL.Output(Lwarn, 2, fmt.Sprintln(v...))
}
}
// Warnf uses fmt.Sprintf to construct and log a message.
func Warnf(format string, v ...interface{}) {
if Lwarn >= _globalL.level {
_globalL.Output(Lwarn, 2, fmt.Sprintf(format, v...))
}
}
// Error uses fmt.Sprintln to construct and log a message.
func Error(v ...interface{}) {
if Lerror >= _globalL.level {
_globalL.Output(Lerror, 2, fmt.Sprintln(v...))
}
}
// Errorf uses fmt.Sprintf to construct and log a message.
func Errorf(format string, v ...interface{}) {
if Lerror >= _globalL.level {
_globalL.Output(Lerror, 2, fmt.Sprintf(format, v...))
}
}
// Panic uses fmt.Sprintln to construct and log a message, then panics.
func Panic(v ...interface{}) {
s := fmt.Sprintln(v...)
if Lpanic >= _globalL.level {
_globalL.Output(Lpanic, 2, s)
}
panic(s)
}
// Panicf uses fmt.Sprintf to construct and log a message, then panics.
func Panicf(format string, v ...interface{}) {
s := fmt.Sprintf(format, v...)
if Lpanic >= _globalL.level {
_globalL.Output(Lpanic, 2, s)
}
panic(s)
}
// Fatal uses fmt.Sprintln to construct and log a message, then calls os.Exit(1).
func Fatal(v ...interface{}) {
if Lfatal >= _globalL.level {
_globalL.Output(Lfatal, 2, fmt.Sprintln(v...))
}
os.Exit(1)
}
// Fatalf uses fmt.Sprintf to construct and log a message, then calls os.Exit(1).
func Fatalf(format string, v ...interface{}) {
if Lfatal >= _globalL.level {
_globalL.Output(Lfatal, 2, fmt.Sprintf(format, v...))
}
os.Exit(1)
}
// Output writes the output for a logging event.
// The string msg contains the text to print after the prefix specified by the flags of the Logger.
// A newline is appended if the last character of s is not already a newline.
// The level argument specifies the log message level.
// The calldepth argument specifies the count of the number of frames to skip
// when computing the file name and line number if Llongfile or Lshortfile is set.
func Output(level int, calldepth int, msg string) error {
return _globalL.Output(level, calldepth+1, msg) // +1 for this frame.
}