terraform/vendor/github.com/cihub/seelog/behavior_asynclogger.go

143 lines
4.0 KiB
Go

// 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 (
"container/list"
"fmt"
"sync"
)
// MaxQueueSize is the critical number of messages in the queue that result in an immediate flush.
const (
MaxQueueSize = 10000
)
type msgQueueItem struct {
level LogLevel
context LogContextInterface
message fmt.Stringer
}
// asyncLogger represents common data for all asynchronous loggers
type asyncLogger struct {
commonLogger
msgQueue *list.List
queueHasElements *sync.Cond
}
// newAsyncLogger creates a new asynchronous logger
func newAsyncLogger(config *logConfig) *asyncLogger {
asnLogger := new(asyncLogger)
asnLogger.msgQueue = list.New()
asnLogger.queueHasElements = sync.NewCond(new(sync.Mutex))
asnLogger.commonLogger = *newCommonLogger(config, asnLogger)
return asnLogger
}
func (asnLogger *asyncLogger) innerLog(
level LogLevel,
context LogContextInterface,
message fmt.Stringer) {
asnLogger.addMsgToQueue(level, context, message)
}
func (asnLogger *asyncLogger) Close() {
asnLogger.m.Lock()
defer asnLogger.m.Unlock()
if !asnLogger.Closed() {
asnLogger.flushQueue(true)
asnLogger.config.RootDispatcher.Flush()
if err := asnLogger.config.RootDispatcher.Close(); err != nil {
reportInternalError(err)
}
asnLogger.closedM.Lock()
asnLogger.closed = true
asnLogger.closedM.Unlock()
asnLogger.queueHasElements.Broadcast()
}
}
func (asnLogger *asyncLogger) Flush() {
asnLogger.m.Lock()
defer asnLogger.m.Unlock()
if !asnLogger.Closed() {
asnLogger.flushQueue(true)
asnLogger.config.RootDispatcher.Flush()
}
}
func (asnLogger *asyncLogger) flushQueue(lockNeeded bool) {
if lockNeeded {
asnLogger.queueHasElements.L.Lock()
defer asnLogger.queueHasElements.L.Unlock()
}
for asnLogger.msgQueue.Len() > 0 {
asnLogger.processQueueElement()
}
}
func (asnLogger *asyncLogger) processQueueElement() {
if asnLogger.msgQueue.Len() > 0 {
backElement := asnLogger.msgQueue.Front()
msg, _ := backElement.Value.(msgQueueItem)
asnLogger.processLogMsg(msg.level, msg.message, msg.context)
asnLogger.msgQueue.Remove(backElement)
}
}
func (asnLogger *asyncLogger) addMsgToQueue(
level LogLevel,
context LogContextInterface,
message fmt.Stringer) {
if !asnLogger.Closed() {
asnLogger.queueHasElements.L.Lock()
defer asnLogger.queueHasElements.L.Unlock()
if asnLogger.msgQueue.Len() >= MaxQueueSize {
fmt.Printf("Seelog queue overflow: more than %v messages in the queue. Flushing.\n", MaxQueueSize)
asnLogger.flushQueue(false)
}
queueItem := msgQueueItem{level, context, message}
asnLogger.msgQueue.PushBack(queueItem)
asnLogger.queueHasElements.Broadcast()
} else {
err := fmt.Errorf("queue closed! Cannot process element: %d %#v", level, message)
reportInternalError(err)
}
}