mirror of https://github.com/k3s-io/k3s
79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package logreduction
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import (
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"sync"
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"time"
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)
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var nowfunc = func() time.Time { return time.Now() }
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// LogReduction provides a filter for consecutive identical log messages;
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// a message will be printed no more than once per interval.
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// If a string of messages is interrupted by a different message,
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// the interval timer will be reset.
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type LogReduction struct {
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lastError map[string]string
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errorPrinted map[string]time.Time
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errorMapLock sync.Mutex
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identicalErrorDelay time.Duration
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}
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// NewLogReduction returns an initialized LogReduction
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func NewLogReduction(identicalErrorDelay time.Duration) *LogReduction {
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l := new(LogReduction)
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l.lastError = make(map[string]string)
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l.errorPrinted = make(map[string]time.Time)
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l.identicalErrorDelay = identicalErrorDelay
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return l
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}
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func (l *LogReduction) cleanupErrorTimeouts() {
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for name, timeout := range l.errorPrinted {
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if nowfunc().Sub(timeout) >= l.identicalErrorDelay {
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delete(l.errorPrinted, name)
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delete(l.lastError, name)
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}
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}
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}
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// ShouldMessageBePrinted determines whether a message should be printed based
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// on how long ago this particular message was last printed
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func (l *LogReduction) ShouldMessageBePrinted(message string, parentID string) bool {
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l.errorMapLock.Lock()
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defer l.errorMapLock.Unlock()
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l.cleanupErrorTimeouts()
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lastMsg, ok := l.lastError[parentID]
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lastPrinted, ok1 := l.errorPrinted[parentID]
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if !ok || !ok1 || message != lastMsg || nowfunc().Sub(lastPrinted) >= l.identicalErrorDelay {
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l.errorPrinted[parentID] = nowfunc()
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l.lastError[parentID] = message
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return true
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}
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return false
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}
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// ClearID clears out log reduction records pertaining to a particular parent
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// (e. g. container ID)
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func (l *LogReduction) ClearID(parentID string) {
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l.errorMapLock.Lock()
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defer l.errorMapLock.Unlock()
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delete(l.lastError, parentID)
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delete(l.errorPrinted, parentID)
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}
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