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Beego/logs/log.go
stansun a804d242d9 revise a comment
If it gets a msg from the buffer chan, it will write the message to
outputs.
2014-07-27 07:13:17 -04:00

272 lines
6.5 KiB
Go

// Beego (http://beego.me/)
//
// @description beego is an open-source, high-performance web framework for the Go programming language.
//
// @link http://github.com/astaxie/beego for the canonical source repository
//
// @license http://github.com/astaxie/beego/blob/master/LICENSE
//
// @authors astaxie
package logs
import (
"fmt"
"path"
"runtime"
"sync"
)
// RFC5424 log message levels.
const (
LevelEmergency = iota
LevelAlert
LevelCritical
LevelError
LevelWarning
LevelNotice
LevelInformational
LevelDebug
)
// Legacy loglevel constants to ensure backwards compatibility.
//
// Deprecated: will be removed in 1.5.0.
const (
LevelInfo = LevelInformational
LevelTrace = LevelDebug
LevelWarn = LevelWarning
)
type loggerType func() LoggerInterface
// LoggerInterface defines the behavior of a log provider.
type LoggerInterface interface {
Init(config string) error
WriteMsg(msg string, level int) error
Destroy()
Flush()
}
var adapters = make(map[string]loggerType)
// Register makes a log provide available by the provided name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func Register(name string, log loggerType) {
if log == nil {
panic("logs: Register provide is nil")
}
if _, dup := adapters[name]; dup {
panic("logs: Register called twice for provider " + name)
}
adapters[name] = log
}
// BeeLogger is default logger in beego application.
// it can contain several providers and log message into all providers.
type BeeLogger struct {
lock sync.Mutex
level int
enableFuncCallDepth bool
loggerFuncCallDepth int
msg chan *logMsg
outputs map[string]LoggerInterface
}
type logMsg struct {
level int
msg string
}
// NewLogger returns a new BeeLogger.
// channellen means the number of messages in chan.
// if the buffering chan is full, logger adapters write to file or other way.
func NewLogger(channellen int64) *BeeLogger {
bl := new(BeeLogger)
bl.level = LevelDebug
bl.loggerFuncCallDepth = 2
bl.msg = make(chan *logMsg, channellen)
bl.outputs = make(map[string]LoggerInterface)
//bl.SetLogger("console", "") // default output to console
go bl.startLogger()
return bl
}
// SetLogger provides a given logger adapter into BeeLogger with config string.
// config need to be correct JSON as string: {"interval":360}.
func (bl *BeeLogger) SetLogger(adaptername string, config string) error {
bl.lock.Lock()
defer bl.lock.Unlock()
if log, ok := adapters[adaptername]; ok {
lg := log()
err := lg.Init(config)
bl.outputs[adaptername] = lg
if err != nil {
fmt.Println("logs.BeeLogger.SetLogger: " + err.Error())
return err
}
} else {
return fmt.Errorf("logs: unknown adaptername %q (forgotten Register?)", adaptername)
}
return nil
}
// remove a logger adapter in BeeLogger.
func (bl *BeeLogger) DelLogger(adaptername string) error {
bl.lock.Lock()
defer bl.lock.Unlock()
if lg, ok := bl.outputs[adaptername]; ok {
lg.Destroy()
delete(bl.outputs, adaptername)
return nil
} else {
return fmt.Errorf("logs: unknown adaptername %q (forgotten Register?)", adaptername)
}
}
func (bl *BeeLogger) writerMsg(loglevel int, msg string) error {
if loglevel > bl.level {
return nil
}
lm := new(logMsg)
lm.level = loglevel
if bl.enableFuncCallDepth {
_, file, line, ok := runtime.Caller(bl.loggerFuncCallDepth)
if ok {
_, filename := path.Split(file)
lm.msg = fmt.Sprintf("[%s:%d] %s", filename, line, msg)
} else {
lm.msg = msg
}
} else {
lm.msg = msg
}
bl.msg <- lm
return nil
}
// Set log message level.
//
// If message level (such as LevelDebug) is higher than logger level (such as LevelWarning),
// log providers will not even be sent the message.
func (bl *BeeLogger) SetLevel(l int) {
bl.level = l
}
// set log funcCallDepth
func (bl *BeeLogger) SetLogFuncCallDepth(d int) {
bl.loggerFuncCallDepth = d
}
// enable log funcCallDepth
func (bl *BeeLogger) EnableFuncCallDepth(b bool) {
bl.enableFuncCallDepth = b
}
// start logger chan reading.
// when chan is not empty, write logs.
func (bl *BeeLogger) startLogger() {
for {
select {
case bm := <-bl.msg:
for _, l := range bl.outputs {
l.WriteMsg(bm.msg, bm.level)
}
}
}
}
// Log EMERGENCY level message.
func (bl *BeeLogger) Emergency(format string, v ...interface{}) {
msg := fmt.Sprintf("[D] "+format, v...)
bl.writerMsg(LevelEmergency, msg)
}
// Log ALERT level message.
func (bl *BeeLogger) Alert(format string, v ...interface{}) {
msg := fmt.Sprintf("[D] "+format, v...)
bl.writerMsg(LevelAlert, msg)
}
// Log CRITICAL level message.
func (bl *BeeLogger) Critical(format string, v ...interface{}) {
msg := fmt.Sprintf("[C] "+format, v...)
bl.writerMsg(LevelCritical, msg)
}
// Log ERROR level message.
func (bl *BeeLogger) Error(format string, v ...interface{}) {
msg := fmt.Sprintf("[E] "+format, v...)
bl.writerMsg(LevelError, msg)
}
// Log WARNING level message.
func (bl *BeeLogger) Warning(format string, v ...interface{}) {
msg := fmt.Sprintf("[W] "+format, v...)
bl.writerMsg(LevelWarning, msg)
}
// Log NOTICE level message.
func (bl *BeeLogger) Notice(format string, v ...interface{}) {
msg := fmt.Sprintf("[W] "+format, v...)
bl.writerMsg(LevelNotice, msg)
}
// Log INFORMATIONAL level message.
func (bl *BeeLogger) Informational(format string, v ...interface{}) {
msg := fmt.Sprintf("[I] "+format, v...)
bl.writerMsg(LevelInformational, msg)
}
// Log DEBUG level message.
func (bl *BeeLogger) Debug(format string, v ...interface{}) {
msg := fmt.Sprintf("[D] "+format, v...)
bl.writerMsg(LevelDebug, msg)
}
// Log WARN level message.
//
// Deprecated: compatibility alias for Warning(), Will be removed in 1.5.0.
func (bl *BeeLogger) Warn(format string, v ...interface{}) {
bl.Warning(format, v...)
}
// Log INFO level message.
//
// Deprecated: compatibility alias for Informational(), Will be removed in 1.5.0.
func (bl *BeeLogger) Info(format string, v ...interface{}) {
bl.Informational(format, v...)
}
// Log TRACE level message.
//
// Deprecated: compatibility alias for Debug(), Will be removed in 1.5.0.
func (bl *BeeLogger) Trace(format string, v ...interface{}) {
bl.Debug(format, v...)
}
// flush all chan data.
func (bl *BeeLogger) Flush() {
for _, l := range bl.outputs {
l.Flush()
}
}
// close logger, flush all chan data and destroy all adapters in BeeLogger.
func (bl *BeeLogger) Close() {
for {
if len(bl.msg) > 0 {
bm := <-bl.msg
for _, l := range bl.outputs {
l.WriteMsg(bm.msg, bm.level)
}
} else {
break
}
}
for _, l := range bl.outputs {
l.Flush()
l.Destroy()
}
}