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logger.go
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logger.go
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package logger
import (
"fmt"
"runtime"
"strings"
"sync"
"time"
)
const (
LevelAbort = iota
LevelError
LevelWarn
LevelInfo
LevelDebug
LoggerConsole = "console"
LoggerFile = "file"
LogRotateNo = 0
LogRotateLines = 1
LogRotateDaily = 2
LogRotateHour = 3
)
var (
levelPrefix []string = []string{"[ABORT]", "[ERROR]", "[WARN]", "[INFO]", "[DEBUG]"}
levelNames []string = []string{"error", "info"}
)
func getLevelByName(name string) int {
switch strings.ToLower(name) {
case "abort":
return LevelAbort
case "error":
return LevelError
case "warn", "warning":
return LevelWarn
case "info", "information":
return LevelInfo
case "debug", "dbg":
return LevelDebug
default:
return LevelDebug
}
}
type LoggerWriter interface {
MatchPrefix(prefix string) bool
Colorful() bool
Write([]byte) (int, error)
Flush()
}
type LoggerOpts struct {
Type string `json:"type"`
Prefixs []string `json:"prefix"`
FileName string `json:"fileName"`
Rotate int `json:"rotate,omitempty"`
MaxLines int `json:"maxLines,omitempty"`
MaxSize int64 `json:"maxSize,omitempty"`
}
var loggerWriters = make(map[string]LoggerWriterCreateFunc)
type LoggerWriterCreateFunc func(opts LoggerOpts) LoggerWriter
func RegisterLoggerWriter(name string, loggerCreateFunc LoggerWriterCreateFunc) {
loggerWriters[name] = loggerCreateFunc
}
func getLoggerWriterCreateFunc(name string) LoggerWriterCreateFunc {
w, e := loggerWriters[name]
if e {
return w
}
name = LoggerConsole
w, _ = loggerWriters[name]
return w
}
// formatter 这个事情貌似不是很合理
type LoggerFormatterFunc func(msg *LoggerMsg, colorful bool) string
type Logger struct {
async bool
level int
prefix string
buff chan *LoggerMsg
formatterFunc LoggerFormatterFunc
}
const defaultBuffSize = 100
func NewLogger(prefix, level string, async bool) *Logger {
logger := &Logger{
async: async,
level: getLevelByName(level),
prefix: prefix,
}
return logger
}
var msgPool *sync.Pool
func allocMsg() *LoggerMsg {
v := msgPool.Get()
msg, _ := v.(*LoggerMsg)
msg.Msg = ""
msg.Caller.Line = -1
msg.Caller.FileName = ""
msg.Prefix = ""
msg.formatter = nil
return msg
}
func freeMsg(msg *LoggerMsg) {
msgPool.Put(msg)
}
func (l *Logger) SetLevel(level int) {
l.level = level
}
func (l *Logger) SetFormatter(formatterFunc LoggerFormatterFunc) {
l.formatterFunc = formatterFunc
}
func (l *Logger) Debug(f string, v ...interface{}) {
if LevelDebug > l.level {
return
}
l.writeMsg(f, v...)
}
func (l *Logger) Info(f string, v ...interface{}) {
if LevelInfo > l.level {
return
}
l.writeMsg(f, v...)
}
func (l *Logger) Warn(f string, v ...interface{}) {
if LevelWarn > l.level {
return
}
l.writeMsg(f, v...)
}
func (l *Logger) Error(f string, v ...interface{}) {
if LevelError > l.level {
return
}
l.writeMsg(f, v...)
}
func (l *Logger) Abort(f string, v ...interface{}) {
if LevelAbort > l.level {
return
}
l.writeMsg(f, v...)
}
func (l *Logger) writeMsg(f string, v ...interface{}) {
rawMsg := fmt.Sprintf(f, v...)
msg := allocMsg()
msg.Msg = rawMsg
msg.Prefix = l.prefix
msg.Time = time.Now()
msg.Level = l.level
msg.formatter = l.formatterFunc
_, file, line, _ := runtime.Caller(2)
msg.Caller.FileName = file
msg.Caller.Line = line
writeLogMsg(msg, l.async)
}
var loggers = struct {
mu sync.Mutex
level string
loggers map[string]*Logger
defaultLogger *Logger
writers []LoggerWriter
buffers chan *LoggerMsg
flush chan int
}{}
func writeLogMsg(msg *LoggerMsg, async bool) {
if loggers.buffers == nil {
return
}
loggers.buffers <- msg
if !async {
loggers.flush <- 1
}
}
func writeTasks() {
flush := false
flushTicker := time.NewTicker(time.Second)
for {
select {
case <-flushTicker.C:
for _, writer := range loggers.writers {
writer.Flush()
}
case <-loggers.flush:
flush = true
continue
case msg := <-loggers.buffers:
for _, writer := range loggers.writers {
if !writer.MatchPrefix(msg.Prefix) {
continue
}
writer.Write([]byte(msg.Format(writer.Colorful())))
if flush && len(loggers.buffers) == 0 {
writer.Flush()
flush = false
}
}
freeMsg(msg)
}
}
}
func init() {
// initialize pool
msgPool = &sync.Pool{
New: func() interface{} {
return &LoggerMsg{}
},
}
go writeTasks()
}
func InitLogger(level string, opts ...LoggerOpts) error {
loggers.mu.Lock()
defer loggers.mu.Unlock()
loggers.loggers = make(map[string]*Logger)
loggers.buffers = make(chan *LoggerMsg, defaultBuffSize)
loggers.flush = make(chan int)
loggers.level = level
if len(opts) == 0 {
opts = append(opts, LoggerOpts{Type: LoggerConsole})
}
for _, opt := range opts {
createFunc := getLoggerWriterCreateFunc(opt.Type)
writer := createFunc(opt)
loggers.writers = append(loggers.writers, writer)
}
return nil
}
func GetLogger(prefix ...string) *Logger {
loggers.mu.Lock()
defer loggers.mu.Unlock()
if len(prefix) == 0 {
return loggers.defaultLogger
}
logger, exist := loggers.loggers[prefix[0]]
if !exist {
logger = NewLogger(prefix[0], loggers.level, true)
loggers.loggers[prefix[0]] = logger
}
return logger
}
func SetLevel(level int) {
loggers.defaultLogger.SetLevel(level)
}
func Debug(f string, v ...interface{}) {
loggers.defaultLogger.Debug(f, v...)
}
func Info(f string, v ...interface{}) {
loggers.defaultLogger.Info(f, v...)
}
func Warn(f string, v ...interface{}) {
loggers.defaultLogger.Warn(f, v...)
}
func Error(f string, v ...interface{}) {
loggers.defaultLogger.Error(f, v...)
}
func Abort(f string, v ...interface{}) {
loggers.defaultLogger.Abort(f, v...)
}