mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-02-14 18:09:57 +00:00
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
//go:build journald
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// +build journald
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/*
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Copyright 2018 The Kubernetes Authors All rights reserved.
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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 logcounter
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import (
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"fmt"
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"time"
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"k8s.io/utils/clock"
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"k8s.io/node-problem-detector/cmd/logcounter/options"
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"k8s.io/node-problem-detector/pkg/logcounter/types"
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"k8s.io/node-problem-detector/pkg/systemlogmonitor"
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"k8s.io/node-problem-detector/pkg/systemlogmonitor/logwatchers/journald"
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watchertypes "k8s.io/node-problem-detector/pkg/systemlogmonitor/logwatchers/types"
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systemtypes "k8s.io/node-problem-detector/pkg/systemlogmonitor/types"
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)
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const (
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bufferSize = 1000
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timeout = 1 * time.Second
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journaldSourceKey = "source"
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)
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type logCounter struct {
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logCh <-chan *systemtypes.Log
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buffer systemlogmonitor.LogBuffer
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pattern string
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revertPattern string
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clock clock.Clock
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}
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func NewJournaldLogCounter(options *options.LogCounterOptions) (types.LogCounter, error) {
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watcher := journald.NewJournaldWatcher(watchertypes.WatcherConfig{
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Plugin: "journald",
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PluginConfig: map[string]string{journaldSourceKey: options.JournaldSource},
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LogPath: options.LogPath,
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Lookback: options.Lookback,
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Delay: options.Delay,
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})
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logCh, err := watcher.Watch()
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if err != nil {
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return nil, fmt.Errorf("error watching journald: %v", err)
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}
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return &logCounter{
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logCh: logCh,
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buffer: systemlogmonitor.NewLogBuffer(bufferSize),
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pattern: options.Pattern,
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revertPattern: options.RevertPattern,
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clock: clock.RealClock{},
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}, nil
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}
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func (e *logCounter) Count() (count int, err error) {
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start := e.clock.Now()
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for {
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select {
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case log, ok := <-e.logCh:
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if !ok {
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err = fmt.Errorf("log channel closed unexpectedly")
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return
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}
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// We only want to count events up until the time at which we started.
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// Otherwise we would run forever
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if start.Before(log.Timestamp) {
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return
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}
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e.buffer.Push(log)
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if len(e.buffer.Match(e.pattern)) != 0 {
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count++
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}
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if e.revertPattern != "" && len(e.buffer.Match(e.revertPattern)) != 0 {
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count--
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}
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case <-e.clock.After(timeout):
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// Don't block forever if we do not get any new messages
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return
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}
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}
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}
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