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log.go
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log.go
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// Copyright (c) 2012 - Cloud Instruments Co., Ltd.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package seelog
import (
"errors"
"fmt"
"sync"
"time"
)
const (
staticFuncCallDepth = 3 // See 'commonLogger.log' method comments
loggerFuncCallDepth = 3
)
// Current is the logger used in all package level convenience funcs like 'Trace', 'Debug', 'Flush', etc.
var Current LoggerInterface
// Default logger that is created from an empty config: "<seelog/>". It is not closed by a ReplaceLogger call.
var Default LoggerInterface
// Disabled logger that doesn't produce any output in any circumstances. It is neither closed nor flushed by a ReplaceLogger call.
var Disabled LoggerInterface
var pkgOperationsMutex *sync.Mutex
func init() {
pkgOperationsMutex = new(sync.Mutex)
var err error
if Default == nil {
Default, err = LoggerFromConfigAsBytes([]byte("<seelog />"))
}
if Disabled == nil {
Disabled, err = LoggerFromConfigAsBytes([]byte("<seelog levels=\"off\"/>"))
}
if err != nil {
panic(fmt.Sprintf("Seelog couldn't start. Error: %s", err.Error()))
}
Current = Default
}
func createLoggerFromFullConfig(config *configForParsing) (LoggerInterface, error) {
if config.LogType == syncloggerTypeFromString {
return NewSyncLogger(&config.logConfig), nil
} else if config.LogType == asyncLooploggerTypeFromString {
return NewAsyncLoopLogger(&config.logConfig), nil
} else if config.LogType == asyncTimerloggerTypeFromString {
logData := config.LoggerData
if logData == nil {
return nil, errors.New("async timer data not set")
}
asyncInt, ok := logData.(asyncTimerLoggerData)
if !ok {
return nil, errors.New("invalid async timer data")
}
logger, err := NewAsyncTimerLogger(&config.logConfig, time.Duration(asyncInt.AsyncInterval))
if !ok {
return nil, err
}
return logger, nil
} else if config.LogType == adaptiveLoggerTypeFromString {
logData := config.LoggerData
if logData == nil {
return nil, errors.New("adaptive logger parameters not set")
}
adaptData, ok := logData.(adaptiveLoggerData)
if !ok {
return nil, errors.New("invalid adaptive logger parameters")
}
logger, err := NewAsyncAdaptiveLogger(
&config.logConfig,
time.Duration(adaptData.MinInterval),
time.Duration(adaptData.MaxInterval),
adaptData.CriticalMsgCount,
)
if err != nil {
return nil, err
}
return logger, nil
}
return nil, errors.New("invalid config log type/data")
}
// UseLogger sets the 'Current' package level logger variable to the specified value.
// This variable is used in all Trace/Debug/... package level convenience funcs.
//
// Example:
//
// after calling
// seelog.UseLogger(somelogger)
// the following:
// seelog.Debug("abc")
// will be equal to
// somelogger.Debug("abc")
//
// IMPORTANT: UseLogger do NOT close the previous logger (only flushes it). So if
// you constantly use it to replace loggers and don't close them in other code, you'll
// end up having memory leaks.
//
// To safely replace loggers, use ReplaceLogger.
func UseLogger(logger LoggerInterface) error {
if logger == nil {
return errors.New("logger can not be nil")
}
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
oldLogger := Current
Current = logger
if oldLogger != nil {
oldLogger.Flush()
}
return nil
}
// ReplaceLogger acts as UseLogger but the logger that was previously
// used is disposed (except Default and Disabled loggers).
//
// Example:
// import log "github.com/cihub/seelog"
//
// func main() {
// logger, err := log.LoggerFromConfigAsFile("seelog.xml")
//
// if err != nil {
// panic(err)
// }
//
// log.ReplaceLogger(logger)
// defer log.Flush()
//
// log.Trace("test")
// log.Debugf("var = %s", "abc")
// }
func ReplaceLogger(logger LoggerInterface) error {
if logger == nil {
return errors.New("logger can not be nil")
}
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
defer func() {
if err := recover(); err != nil {
reportInternalError(fmt.Errorf("recovered from panic during ReplaceLogger: %s", err))
}
}()
if Current == Default {
Current.Flush()
} else if Current != nil && !Current.Closed() && Current != Disabled {
Current.Flush()
Current.Close()
}
Current = logger
return nil
}
// Tracef formats message according to format specifier
// and writes to default logger with log level = Trace.
func Tracef(format string, params ...interface{}) {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
Current.traceWithCallDepth(staticFuncCallDepth, newLogFormattedMessage(format, params))
}
// Debugf formats message according to format specifier
// and writes to default logger with log level = Debug.
func Debugf(format string, params ...interface{}) {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
Current.debugWithCallDepth(staticFuncCallDepth, newLogFormattedMessage(format, params))
}
// Infof formats message according to format specifier
// and writes to default logger with log level = Info.
func Infof(format string, params ...interface{}) {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
Current.infoWithCallDepth(staticFuncCallDepth, newLogFormattedMessage(format, params))
}
// Warnf formats message according to format specifier and writes to default logger with log level = Warn
func Warnf(format string, params ...interface{}) error {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
message := newLogFormattedMessage(format, params)
Current.warnWithCallDepth(staticFuncCallDepth, message)
return errors.New(message.String())
}
// Errorf formats message according to format specifier and writes to default logger with log level = Error
func Errorf(format string, params ...interface{}) error {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
message := newLogFormattedMessage(format, params)
Current.errorWithCallDepth(staticFuncCallDepth, message)
return errors.New(message.String())
}
// Criticalf formats message according to format specifier and writes to default logger with log level = Critical
func Criticalf(format string, params ...interface{}) error {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
message := newLogFormattedMessage(format, params)
Current.criticalWithCallDepth(staticFuncCallDepth, message)
return errors.New(message.String())
}
// Trace formats message using the default formats for its operands and writes to default logger with log level = Trace
func Trace(v ...interface{}) {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
Current.traceWithCallDepth(staticFuncCallDepth, newLogMessage(v))
}
// Debug formats message using the default formats for its operands and writes to default logger with log level = Debug
func Debug(v ...interface{}) {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
Current.debugWithCallDepth(staticFuncCallDepth, newLogMessage(v))
}
// Info formats message using the default formats for its operands and writes to default logger with log level = Info
func Info(v ...interface{}) {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
Current.infoWithCallDepth(staticFuncCallDepth, newLogMessage(v))
}
// Warn formats message using the default formats for its operands and writes to default logger with log level = Warn
func Warn(v ...interface{}) error {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
message := newLogMessage(v)
Current.warnWithCallDepth(staticFuncCallDepth, message)
return errors.New(message.String())
}
// Error formats message using the default formats for its operands and writes to default logger with log level = Error
func Error(v ...interface{}) error {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
message := newLogMessage(v)
Current.errorWithCallDepth(staticFuncCallDepth, message)
return errors.New(message.String())
}
// Critical formats message using the default formats for its operands and writes to default logger with log level = Critical
func Critical(v ...interface{}) error {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
message := newLogMessage(v)
Current.criticalWithCallDepth(staticFuncCallDepth, message)
return errors.New(message.String())
}
// Flush immediately processes all currently queued messages and all currently buffered messages.
// It is a blocking call which returns only after the queue is empty and all the buffers are empty.
//
// If Flush is called for a synchronous logger (type='sync'), it only flushes buffers (e.g. '<buffered>' receivers)
// , because there is no queue.
//
// Call this method when your app is going to shut down not to lose any log messages.
func Flush() {
pkgOperationsMutex.Lock()
defer pkgOperationsMutex.Unlock()
Current.Flush()
}