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logy.go
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logy.go
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/*
logy logger 实现
*/
package logy
import (
"bytes"
"fmt"
"io"
"os"
"runtime"
"strings"
"sync"
"time"
)
const (
Ldate = 1 << iota // the date in the local time zone: 2006-01-02
Ltime // the time in the local time zone: 15:04:05
Lmicroseconds // microsecond resolution: 01:23:23.123. 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
LUTC // if Ldate or Ltime is set, use UTC rather than the local time zone
Lmodule // module name
Llevel // the level of the logy
LstdFlags = Ldate | Ltime | Lshortfile | Llevel // initial values for the standard logger
)
const (
levelTest = iota
LevelDebug
LevelInfo
LevelNotice
LevelWarn
LevelError
LevelPanic
LevelFatal
)
var levels = []string{
"[T]",
"[D]",
"[I]",
"[N]",
"[W]",
"[E]",
"[P]",
"[F]",
}
// Writer writer interface
type Writer interface {
WriteLog(t time.Time, level int, b []byte)
}
// writer 实现
type writer struct {
w io.Writer
}
func (wr writer) WriteLog(t time.Time, level int, b []byte) {
wr.w.Write(b)
}
// NewWriter return a Writer.
func NewWriter(w io.Writer) Writer {
return writer{w: w}
}
//===========================logger======================
type LogData struct {
Prefix string `json:"prefix"` // log prefix
Level int `json:"level"` // log level
Msg string `json:"msg"` // msg
Created time.Time `json:"created"` // time
}
type Logger struct {
pool *sync.Pool
flag int
level int
out Writer
callDepth int
prefix string
}
// NewLogger return a new Logger
func NewLogger(w Writer, flag int, level int) *Logger {
return &Logger{
pool: &sync.Pool{
New: func() interface{} {
return bytes.NewBuffer(nil)
},
},
flag: flag,
level: level,
out: w,
callDepth: 2,
}
}
func (l *Logger) SetPrefix(prefix string) {
l.prefix = prefix
}
func (l *Logger) Prefix() string {
return l.prefix
}
func (l *Logger) Flags() int {
return l.flag
}
func (l *Logger) SetFlags(flag int) {
l.flag = flag
}
func (l *Logger) SetLevel(level int) {
l.level = level
}
func (l *Logger) SetOutput(w Writer, prefix string) {
l.out = w
l.prefix = prefix
}
func (l *Logger) SetCallDepth(depth int) {
l.callDepth = depth
}
func (l *Logger) CallDepth() int {
return l.callDepth
}
func (l *Logger) formatHeader(buf *bytes.Buffer, t time.Time, file string, line int, lvl int) {
if l.prefix != "" {
buf.WriteByte('[')
buf.WriteString(l.prefix)
buf.WriteByte(']')
buf.WriteByte(' ')
}
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()/1e6, 3)
}
buf.WriteByte(' ')
}
}
if l.flag&Llevel != 0 {
buf.WriteString(levels[lvl])
buf.WriteByte(' ')
}
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.WriteString(": ")
}
}
func (l *Logger) output(lvl int, s string) {
now := time.Now()
var file string
var line int
if l.flag&(Lshortfile|Llongfile) != 0 {
var ok bool
_, file, line, ok = runtime.Caller(l.callDepth)
if !ok {
file = "???"
line = 0
}
}
buf := l.pool.Get().(*bytes.Buffer)
buf.Reset()
l.formatHeader(buf, now, file, line, lvl)
buf.WriteString(s)
if len(s) > 0 && s[len(s)-1] != '\n' {
buf.WriteByte('\n')
}
l.out.WriteLog(now, lvl, buf.Bytes())
l.pool.Put(buf)
}
func (l *Logger) Debug(format string, v ...interface{}) {
if LevelDebug < l.level {
return
}
l.output(LevelDebug, fmt.Sprintf(format, v...))
}
func (l *Logger) Info(format string, v ...interface{}) {
if LevelInfo < l.level {
return
}
l.output(LevelInfo, fmt.Sprintf(format, v...))
}
func (l *Logger) Notice(format string, v ...interface{}) {
if LevelNotice < l.level {
return
}
l.output(LevelNotice, fmt.Sprintf(format, v...))
}
func (l *Logger) Warn(format string, v ...interface{}) {
if LevelWarn < l.level {
return
}
l.output(LevelWarn, fmt.Sprintf(format, v...))
}
func (l *Logger) Error(format string, v ...interface{}) {
if LevelError < l.level {
return
}
l.output(LevelError, fmt.Sprintf(format, v...))
}
func (l *Logger) Panic(format string, v ...interface{}) {
if LevelPanic < l.level {
return
}
s := fmt.Sprintf(format, v...)
l.output(LevelPanic, s)
panic(s)
}
func (l *Logger) Fatal(format string, v ...interface{}) {
if LevelFatal < l.level {
return
}
l.output(LevelFatal, fmt.Sprintf(format, v...))
os.Exit(1)
}
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"
}