A compatible log extension
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log/logext.go

596 lines
14 KiB

package log
import (
"bytes"
"fmt"
"io"
"os"
"runtime"
"strings"
"sync"
"time"
)
// These flags define which text to prefix to each log entry generated by the Logger.
const (
// Bits 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). A colon appears after these items:
// 2009/0123 01:23:23.123123 /a/b/c/d.go:23: message
Ldate = 1 << iota // the date: 2009/0123
Ltime // the time: 01:23:23
Lmicroseconds // microsecond resolution: 01:23:23.123123. assumes Ltime.
Llongfile // full file name and line number: /a/b/c/d.go:23
Lshortfile // final file name element and line number: d.go:23. overrides Llongfile
Lmodule // module name
Llevel // level: 0(Debug), 1(Info), 2(Warn), 3(Error), 4(Panic), 5(Fatal)
Llongcolor // color will start [info] end of line
Lshortcolor // color only include [info]
LstdFlags = Ldate | Ltime // initial values for the standard logger
//Ldefault = Llevel | LstdFlags | Lshortfile | Llongcolor
) // [prefix][time][level][module][shortfile|longfile]
func Ldefault() int {
if runtime.GOOS == "windows" {
return Llevel | LstdFlags | Lshortfile
}
return Llevel | LstdFlags | Lshortfile | Llongcolor
}
func Version() string {
return "0.2.0.1121"
}
const (
Lall = iota
)
const (
Ldebug = iota
Linfo
Lwarn
Lerror
Lpanic
Lfatal
Lnone
)
const (
ForeBlack = iota + 30 //30
ForeRed //31
ForeGreen //32
ForeYellow //33
ForeBlue //34
ForePurple //35
ForeCyan //36
ForeWhite //37
)
const (
BackBlack = iota + 40 //40
BackRed //41
BackGreen //42
BackYellow //43
BackBlue //44
BackPurple //45
BackCyan //46
BackWhite //47
)
var levels = []string{
"[Debug]",
"[Info]",
"[Warn]",
"[Error]",
"[Panic]",
"[Fatal]",
}
// MUST called before all logs
func SetLevels(lvs []string) {
levels = lvs
}
var colors = []int{
ForeCyan,
ForeGreen,
ForeYellow,
ForeRed,
ForePurple,
ForeBlue,
}
// MUST called before all logs
func SetColors(cls []int) {
colors = cls
}
// 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 {
mu sync.Mutex // ensures atomic writes; protects the following fields
prefix string // prefix to write at beginning of each line
flag int // properties
Level int
out io.Writer // destination for output
buf bytes.Buffer // for accumulating text to write
levelStats [6]int64
loc *time.Location
}
// 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.
func New(out io.Writer, prefix string, flag int) *Logger {
l := &Logger{out: out, prefix: prefix, Level: 1, flag: flag, loc: time.Local}
if out != os.Stdout {
l.flag = RmColorFlags(l.flag)
}
return l
}
var Std = New(os.Stderr, "", Ldefault())
// Cheap integer to fixed-width decimal ASCII. Give a negative width to avoid zero-padding.
// Knows the buffer has capacity.
func itoa(buf *bytes.Buffer, i int, wid int) {
var u uint = uint(i)
if u == 0 && wid <= 1 {
buf.WriteByte('0')
return
}
// Assemble decimal in reverse order.
var b [32]byte
bp := len(b)
for ; u > 0 || wid > 0; u /= 10 {
bp--
wid--
b[bp] = byte(u%10) + '0'
}
// avoid slicing b to avoid an allocation.
for bp < len(b) {
buf.WriteByte(b[bp])
bp++
}
}
func moduleOf(file string) string {
pos := strings.LastIndex(file, "/")
if pos != -1 {
pos1 := strings.LastIndex(file[:pos], "/src/")
if pos1 != -1 {
return file[pos1+5 : pos]
}
}
return "UNKNOWN"
}
func (l *Logger) formatHeader(buf *bytes.Buffer, t time.Time,
file string, line int, lvl int, reqId string) {
if l.prefix != "" {
buf.WriteString(l.prefix)
}
if l.flag&(Ldate|Ltime|Lmicroseconds) != 0 {
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|Lmicroseconds) != 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&Lmicroseconds != 0 {
buf.WriteByte('.')
itoa(buf, t.Nanosecond()/1e3, 6)
}
buf.WriteByte(' ')
}
}
if reqId != "" {
buf.WriteByte('[')
buf.WriteString(reqId)
buf.WriteByte(']')
buf.WriteByte(' ')
}
if l.flag&(Lshortcolor|Llongcolor) != 0 {
buf.WriteString(fmt.Sprintf("\033[1;%dm", colors[lvl]))
}
if l.flag&Llevel != 0 {
buf.WriteString(levels[lvl])
buf.WriteByte(' ')
}
if l.flag&Lshortcolor != 0 {
buf.WriteString("\033[0m")
}
if l.flag&Lmodule != 0 {
buf.WriteByte('[')
buf.WriteString(moduleOf(file))
buf.WriteByte(']')
buf.WriteByte(' ')
}
if l.flag&(Lshortfile|Llongfile) != 0 {
if l.flag&Lshortfile != 0 {
short := file
for i := len(file) - 1; i > 0; i-- {
if file[i] == '/' {
short = file[i+1:]
break
}
}
file = short
}
buf.WriteString(file)
buf.WriteByte(':')
itoa(buf, line, -1)
buf.WriteByte(' ')
}
}
// Output writes the output for a logging event. The string s 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. Calldepth is used to recover the PC and is
// provided for generality, although at the moment on all pre-defined
// paths it will be 2.
func (l *Logger) Output(reqId string, lvl int, calldepth int, s string) error {
if lvl < l.Level {
return nil
}
now := time.Now().In(l.loc) // get this early.
var file string
var line int
l.mu.Lock()
defer l.mu.Unlock()
if l.flag&(Lshortfile|Llongfile|Lmodule) != 0 {
// release lock while getting caller info - it's expensive.
l.mu.Unlock()
var ok bool
_, file, line, ok = runtime.Caller(calldepth)
if !ok {
file = "???"
line = 0
}
l.mu.Lock()
}
l.levelStats[lvl]++
l.buf.Reset()
l.formatHeader(&l.buf, now, file, line, lvl, reqId)
l.buf.WriteString(s)
if l.flag&Llongcolor != 0 {
l.buf.WriteString("\033[0m")
}
if len(s) > 0 && s[len(s)-1] != '\n' {
l.buf.WriteByte('\n')
}
_, err := l.out.Write(l.buf.Bytes())
return err
}
// -----------------------------------------
// Printf calls l.Output to print to the logger.
// Arguments are handled in the manner of fmt.Printf.
func (l *Logger) Printf(format string, v ...interface{}) {
l.Output("", Linfo, 2, fmt.Sprintf(format, v...))
}
// Print calls l.Output to print to the logger.
// Arguments are handled in the manner of fmt.Print.
func (l *Logger) Print(v ...interface{}) {
l.Output("", Linfo, 2, fmt.Sprint(v...))
}
// Println calls l.Output to print to the logger.
// Arguments are handled in the manner of fmt.Println.
func (l *Logger) Println(v ...interface{}) {
l.Output("", Linfo, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func (l *Logger) Debugf(format string, v ...interface{}) {
l.Output("", Ldebug, 2, fmt.Sprintf(format, v...))
}
func (l *Logger) Debug(v ...interface{}) {
l.Output("", Ldebug, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func (l *Logger) Infof(format string, v ...interface{}) {
l.Output("", Linfo, 2, fmt.Sprintf(format, v...))
}
func (l *Logger) Info(v ...interface{}) {
l.Output("", Linfo, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func (l *Logger) Warnf(format string, v ...interface{}) {
l.Output("", Lwarn, 2, fmt.Sprintf(format, v...))
}
func (l *Logger) Warn(v ...interface{}) {
l.Output("", Lwarn, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func (l *Logger) Errorf(format string, v ...interface{}) {
l.Output("", Lerror, 2, fmt.Sprintf(format, v...))
}
func (l *Logger) Error(v ...interface{}) {
l.Output("", Lerror, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func (l *Logger) Fatal(v ...interface{}) {
l.Output("", Lfatal, 2, fmt.Sprintln(v...))
os.Exit(1)
}
// Fatalf is equivalent to l.Printf() followed by a call to os.Exit(1).
func (l *Logger) Fatalf(format string, v ...interface{}) {
l.Output("", Lfatal, 2, fmt.Sprintf(format, v...))
os.Exit(1)
}
// -----------------------------------------
// Panic is equivalent to l.Print() followed by a call to panic().
func (l *Logger) Panic(v ...interface{}) {
s := fmt.Sprintln(v...)
l.Output("", Lpanic, 2, s)
panic(s)
}
// Panicf is equivalent to l.Printf() followed by a call to panic().
func (l *Logger) Panicf(format string, v ...interface{}) {
s := fmt.Sprintf(format, v...)
l.Output("", Lpanic, 2, s)
panic(s)
}
// -----------------------------------------
func (l *Logger) Stack(v ...interface{}) {
s := fmt.Sprint(v...)
s += "\n"
buf := make([]byte, 1024*1024)
n := runtime.Stack(buf, true)
s += string(buf[:n])
s += "\n"
l.Output("", Lerror, 2, s)
}
// -----------------------------------------
func (l *Logger) Stat() (stats []int64) {
l.mu.Lock()
v := l.levelStats
l.mu.Unlock()
return v[:]
}
// Flags returns the output flags for the logger.
func (l *Logger) Flags() int {
l.mu.Lock()
defer l.mu.Unlock()
return l.flag
}
func RmColorFlags(flag int) int {
// for un std out, it should not show color since almost them don't support
if flag&Llongcolor != 0 {
flag = flag ^ Llongcolor
}
if flag&Lshortcolor != 0 {
flag = flag ^ Lshortcolor
}
return flag
}
func (l *Logger) Location() *time.Location {
return l.loc
}
func (l *Logger) SetLocation(loc *time.Location) {
l.loc = loc
}
// SetFlags sets the output flags for the logger.
func (l *Logger) SetFlags(flag int) {
l.mu.Lock()
defer l.mu.Unlock()
if l.out != os.Stdout {
flag = RmColorFlags(flag)
}
l.flag = flag
}
// Prefix returns the output prefix for the logger.
func (l *Logger) Prefix() string {
l.mu.Lock()
defer l.mu.Unlock()
return l.prefix
}
// SetPrefix sets the output prefix for the logger.
func (l *Logger) SetPrefix(prefix string) {
l.mu.Lock()
defer l.mu.Unlock()
l.prefix = prefix
}
// SetOutputLevel sets the output level for the logger.
func (l *Logger) SetOutputLevel(lvl int) {
l.mu.Lock()
defer l.mu.Unlock()
l.Level = lvl
}
func (l *Logger) OutputLevel() int {
return l.Level
}
func (l *Logger) SetOutput(w io.Writer) {
l.mu.Lock()
defer l.mu.Unlock()
l.out = w
if w != os.Stdout {
l.flag = RmColorFlags(l.flag)
}
}
// SetOutput sets the output destination for the standard logger.
func SetOutput(w io.Writer) {
Std.SetOutput(w)
}
func SetLocation(loc *time.Location) {
Std.SetLocation(loc)
}
func Location() *time.Location {
return Std.Location()
}
// Flags returns the output flags for the standard logger.
func Flags() int {
return Std.Flags()
}
// SetFlags sets the output flags for the standard logger.
func SetFlags(flag int) {
Std.SetFlags(flag)
}
// Prefix returns the output prefix for the standard logger.
func Prefix() string {
return Std.Prefix()
}
// SetPrefix sets the output prefix for the standard logger.
func SetPrefix(prefix string) {
Std.SetPrefix(prefix)
}
func SetOutputLevel(lvl int) {
Std.SetOutputLevel(lvl)
}
func OutputLevel() int {
return Std.OutputLevel()
}
// -----------------------------------------
// Print calls Output to print to the standard logger.
// Arguments are handled in the manner of fmt.Print.
func Print(v ...interface{}) {
Std.Output("", Linfo, 2, fmt.Sprintln(v...))
}
// Printf calls Output to print to the standard logger.
// Arguments are handled in the manner of fmt.Printf.
func Printf(format string, v ...interface{}) {
Std.Output("", Linfo, 2, fmt.Sprintf(format, v...))
}
// Println calls Output to print to the standard logger.
// Arguments are handled in the manner of fmt.Println.
func Println(v ...interface{}) {
Std.Output("", Linfo, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func Debugf(format string, v ...interface{}) {
Std.Output("", Ldebug, 2, fmt.Sprintf(format, v...))
}
func Debug(v ...interface{}) {
Std.Output("", Ldebug, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func Infof(format string, v ...interface{}) {
Std.Output("", Linfo, 2, fmt.Sprintf(format, v...))
}
func Info(v ...interface{}) {
Std.Output("", Linfo, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func Warnf(format string, v ...interface{}) {
Std.Output("", Lwarn, 2, fmt.Sprintf(format, v...))
}
func Warn(v ...interface{}) {
Std.Output("", Lwarn, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
func Errorf(format string, v ...interface{}) {
Std.Output("", Lerror, 2, fmt.Sprintf(format, v...))
}
func Error(v ...interface{}) {
Std.Output("", Lerror, 2, fmt.Sprintln(v...))
}
// -----------------------------------------
// Fatal is equivalent to Print() followed by a call to os.Exit(1).
func Fatal(v ...interface{}) {
Std.Output("", Lfatal, 2, fmt.Sprintln(v...))
}
// Fatalf is equivalent to Printf() followed by a call to os.Exit(1).
func Fatalf(format string, v ...interface{}) {
Std.Output("", Lfatal, 2, fmt.Sprintf(format, v...))
}
// -----------------------------------------
// Panic is equivalent to Print() followed by a call to panic().
func Panic(v ...interface{}) {
Std.Output("", Lpanic, 2, fmt.Sprintln(v...))
}
// Panicf is equivalent to Printf() followed by a call to panic().
func Panicf(format string, v ...interface{}) {
Std.Output("", Lpanic, 2, fmt.Sprintf(format, v...))
}
// -----------------------------------------
func Stack(v ...interface{}) {
s := fmt.Sprint(v...)
s += "\n"
buf := make([]byte, 1024*1024)
n := runtime.Stack(buf, true)
s += string(buf[:n])
s += "\n"
Std.Output("", Lerror, 2, s)
}
// -----------------------------------------