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log.go
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log.go
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package log
import (
"bytes"
"fmt"
"io"
"log"
"os"
"runtime"
"strings"
)
type Level int
const (
FatalLevel Level = 0 // Errors must be properly handled
ErrorLevel Level = 1 // Errors should be properly handled
WarnLevel Level = 2 // Errors could be ignored; messages might need noticed
InfoLevel Level = 3 // Informational messages
DebugLevel Level = 4 // Debug messages
)
func ParseLevel(levelString string) Level {
switch strings.ToLower(levelString) {
case "debug":
return DebugLevel
case "info":
return InfoLevel
case "warn":
return WarnLevel
case "error":
return ErrorLevel
case "fatal":
return FatalLevel
default:
return InfoLevel
}
}
type Logger struct {
filePath string // the underlying log file path
out io.WriteCloser
level Level
logger *log.Logger
task string
skipCallDepth int
}
var logFlags = log.Ldate | log.Ltime | log.Lmicroseconds
func NewFileLogger(path string, logLevel Level) Logger {
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
panic("Failed to open log file " + path)
}
l := NewLogger(f, logLevel)
l.filePath = path
return l
}
func NewLogger(out io.WriteCloser, logLevel Level) Logger {
l := Logger{
out: out,
level: logLevel,
logger: log.New(out, "", logFlags),
skipCallDepth: 3,
}
return l
}
func (l Logger) NewWithTaskName(taskName string) Logger {
return Logger{
out: l.out,
level: l.level,
logger: l.logger,
task: taskName,
skipCallDepth: l.skipCallDepth,
}
}
func (l *Logger) SetSkipCallDepth(depth int) {
l.skipCallDepth = depth
}
func (l *Logger) ResetLevel(level Level) {
l.level = level
}
func (l Logger) GetLogger() *log.Logger {
return l.logger
}
func (l Logger) Log(level Level, skipCallDepth int, args ...interface{}) {
prefixArray := prefixArray(l.task, skipCallDepth)
switch level {
case InfoLevel:
if l.level < InfoLevel {
return
}
prefixArray = append(prefixArray, "[INFO]")
break
case WarnLevel:
if l.level < WarnLevel {
return
}
prefixArray = append(prefixArray, "[WARN]")
break
case ErrorLevel:
if l.level < ErrorLevel {
return
}
prefixArray = append(prefixArray, "[ERROR]")
break
case FatalLevel:
if l.level < FatalLevel {
return
}
prefixArray = append(prefixArray, "[FATAL]")
break
case DebugLevel:
if l.level < DebugLevel {
return
}
prefixArray = append(prefixArray, "[DEBUG]")
}
args = append(prefixArray, args...)
l.logger.Println(args...)
}
func (l Logger) Debug(args ...interface{}) {
if l.level < DebugLevel {
return
}
prefixArray := prefixArray(l.task, l.skipCallDepth)
prefixArray = append(prefixArray, "[DEBUG]")
args = append(prefixArray, args...)
l.logger.Println(args...)
}
func (l Logger) Info(args ...interface{}) {
if l.level < InfoLevel {
return
}
prefixArray := prefixArray(l.task, l.skipCallDepth)
prefixArray = append(prefixArray, "[INFO]")
args = append(prefixArray, args...)
l.logger.Println(args...)
}
func (l Logger) Warn(args ...interface{}) {
if l.level < WarnLevel {
return
}
prefixArray := prefixArray(l.task, l.skipCallDepth)
prefixArray = append(prefixArray, "[WARN]")
args = append(prefixArray, args...)
l.logger.Println(args...)
}
func (l Logger) Error(args ...interface{}) {
if l.level < ErrorLevel {
return
}
prefixArray := prefixArray(l.task, l.skipCallDepth)
prefixArray = append(prefixArray, "[ERROR]")
args = append(prefixArray, args...)
l.logger.Println(args...)
}
func (l Logger) Fatal(args ...interface{}) {
if l.level < FatalLevel {
return
}
prefixArray := prefixArray(l.task, l.skipCallDepth)
prefixArray = append(prefixArray, "[FATAL]")
args = append(prefixArray, args...)
l.logger.Println(args...)
}
// Write a new line with args. Unless you really want to customize
// output format, use "Info", "Warn", "Error" instead
func (l Logger) Println(args ...interface{}) {
_, _ = l.out.Write([]byte(fmt.Sprintln(args...)))
}
func (l Logger) Close() error {
return l.out.Close()
}
func (l *Logger) ReopenLogFile() {
if len(l.filePath) == 0 {
return
}
newFile, err := os.OpenFile(l.filePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
panic(fmt.Sprintln("ReopenLogFile:", l.filePath, err))
}
newLogger := log.New(newFile, "", logFlags)
oldFile := l.out
l.out = newFile
l.logger = newLogger
_ = oldFile.Close()
}
// get file,line and func
func GetCaller(skipCallDepth int) string {
_, fullPath, line, ok := runtime.Caller(skipCallDepth)
if !ok {
return ""
}
fileParts := strings.Split(fullPath, "/")
file := fileParts[len(fileParts)-2] + "/" + fileParts[len(fileParts)-1]
return fmt.Sprintf("%s:%d", file, line)
}
func prefixArray(task string, skipCallDepth int) []interface{} {
array := make([]interface{}, 0, 3)
if len(task) == 0 {
task = "-"
}
array = append(array, task)
array = append(array, GetCaller(skipCallDepth))
return array
}
// Just for test
type CloseBuffer struct {
*bytes.Buffer
}
func (B CloseBuffer) Close() error {
B.Buffer.Reset()
return nil
}