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logo.go
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logo.go
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/*
* Copyright 2015 Xuyuan Pang
* Author: Xuyuan Pang
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package logo
import (
"fmt"
"io"
"os"
"runtime"
"sync"
"time"
)
// Logger function type
type Logger func(depth int, level LogLevel, msg string)
// New create a new Logger which outputs log message into io.Writer.
func New(lowest LogLevel, w io.Writer, prefix string, flag int) Logger {
var mu sync.Mutex
var buf []byte
return func(depth int, lvl LogLevel, msg string) {
// ignore low level.
if lvl < lowest {
return
}
now := time.Now()
var file string
var line int
mu.Lock()
if flag&(Lshortfile|Llongfile) != 0 {
// release lock wihle getting caller info - it's expensive.
mu.Unlock()
var ok bool
_, file, line, ok = runtime.Caller(depth + 1)
if !ok {
file = "???"
line = 0
}
mu.Lock()
}
buf = buf[:0]
formatHeader(&buf, prefix, flag, now, file, line, lvl)
if flag&Lcolor != 0 {
buf = append(buf, colorMap[lvl]...)
buf = append(buf, msg...)
buf = append(buf, colorReset...)
} else {
buf = append(buf, msg...)
}
if len(msg) > 0 && msg[len(msg)-1] != '\n' {
buf = append(buf, '\n')
}
w.Write(buf)
mu.Unlock()
}
}
// NewStd creates a new Logger using stdout.
func NewStd(lowest LogLevel, prefix string, flags int) Logger {
return New(lowest, os.Stdout, prefix, flags)
}
// Group combines multiple Logger interface into a new Logger which
// outputs all log message into each Logger of provided.
func Group(lowest LogLevel, Loggers ...Logger) Logger {
return func(depth int, lvl LogLevel, msg string) {
if lvl < lowest {
return
}
for _, l := range Loggers {
l.Output(depth+2, lvl, msg)
}
}
}
// Output writes the output for a logging event. The string s contains
// the text to print specified by the flags of the
// Logger. A newline is appended if the last character of s is not
// already a newline. depth 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(depth int, level LogLevel, msg string) {
l(depth, level, msg)
}
// Log messages using this level.
func (l Logger) Log(level LogLevel, format string, args ...interface{}) {
l.Output(2, level, fmt.Sprintf(format, args...))
}
// Debug logs Debug level message.
func (l Logger) Debug(format string, args ...interface{}) {
l.Output(2, LevelDebug, fmt.Sprintf(format, args...))
}
// Info logs Info level message.
func (l Logger) Info(format string, args ...interface{}) {
l.Output(2, LevelInfo, fmt.Sprintf(format, args...))
}
// Warning logs warning level message.
func (l Logger) Warning(format string, args ...interface{}) {
l.Output(2, LevelWarning, fmt.Sprintf(format, args...))
}
// Error logs Error level message.
func (l Logger) Error(format string, args ...interface{}) {
l.Output(2, LevelError, fmt.Sprintf(format, args...))
}
// Critical log Critical level message.
func (l Logger) Critical(format string, args ...interface{}) {
l.Output(2, LevelCritical, fmt.Sprintf(format, args...))
}