143 lines
4.0 KiB
Go
143 lines
4.0 KiB
Go
// Copyright (c) 2012 - Cloud Instruments Co., Ltd.
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package seelog
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import (
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"container/list"
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"fmt"
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"sync"
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)
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// MaxQueueSize is the critical number of messages in the queue that result in an immediate flush.
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const (
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MaxQueueSize = 10000
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)
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type msgQueueItem struct {
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level LogLevel
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context LogContextInterface
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message fmt.Stringer
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}
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// asyncLogger represents common data for all asynchronous loggers
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type asyncLogger struct {
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commonLogger
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msgQueue *list.List
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queueHasElements *sync.Cond
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}
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// newAsyncLogger creates a new asynchronous logger
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func newAsyncLogger(config *logConfig) *asyncLogger {
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asnLogger := new(asyncLogger)
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asnLogger.msgQueue = list.New()
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asnLogger.queueHasElements = sync.NewCond(new(sync.Mutex))
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asnLogger.commonLogger = *newCommonLogger(config, asnLogger)
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return asnLogger
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}
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func (asnLogger *asyncLogger) innerLog(
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level LogLevel,
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context LogContextInterface,
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message fmt.Stringer) {
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asnLogger.addMsgToQueue(level, context, message)
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}
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func (asnLogger *asyncLogger) Close() {
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asnLogger.m.Lock()
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defer asnLogger.m.Unlock()
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if !asnLogger.Closed() {
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asnLogger.flushQueue(true)
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asnLogger.config.RootDispatcher.Flush()
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if err := asnLogger.config.RootDispatcher.Close(); err != nil {
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reportInternalError(err)
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}
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asnLogger.closedM.Lock()
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asnLogger.closed = true
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asnLogger.closedM.Unlock()
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asnLogger.queueHasElements.Broadcast()
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}
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}
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func (asnLogger *asyncLogger) Flush() {
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asnLogger.m.Lock()
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defer asnLogger.m.Unlock()
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if !asnLogger.Closed() {
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asnLogger.flushQueue(true)
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asnLogger.config.RootDispatcher.Flush()
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}
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}
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func (asnLogger *asyncLogger) flushQueue(lockNeeded bool) {
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if lockNeeded {
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asnLogger.queueHasElements.L.Lock()
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defer asnLogger.queueHasElements.L.Unlock()
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}
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for asnLogger.msgQueue.Len() > 0 {
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asnLogger.processQueueElement()
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}
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}
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func (asnLogger *asyncLogger) processQueueElement() {
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if asnLogger.msgQueue.Len() > 0 {
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backElement := asnLogger.msgQueue.Front()
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msg, _ := backElement.Value.(msgQueueItem)
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asnLogger.processLogMsg(msg.level, msg.message, msg.context)
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asnLogger.msgQueue.Remove(backElement)
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}
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}
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func (asnLogger *asyncLogger) addMsgToQueue(
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level LogLevel,
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context LogContextInterface,
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message fmt.Stringer) {
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if !asnLogger.Closed() {
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asnLogger.queueHasElements.L.Lock()
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defer asnLogger.queueHasElements.L.Unlock()
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if asnLogger.msgQueue.Len() >= MaxQueueSize {
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fmt.Printf("Seelog queue overflow: more than %v messages in the queue. Flushing.\n", MaxQueueSize)
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asnLogger.flushQueue(false)
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}
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queueItem := msgQueueItem{level, context, message}
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asnLogger.msgQueue.PushBack(queueItem)
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asnLogger.queueHasElements.Broadcast()
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} else {
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err := fmt.Errorf("queue closed! Cannot process element: %d %#v", level, message)
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reportInternalError(err)
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}
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}
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