mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-08-20 04:36:41 +00:00
Ciprian Hacman
b02e2dcd09
Compile fixed patterns during monitor and log counter initialization, pass compiled expressions to the log buffer, and reject invalid log counter patterns before watching logs.
111 lines
3.1 KiB
Go
111 lines
3.1 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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"regexp"
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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 *regexp.Regexp
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revertPattern *regexp.Regexp
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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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pattern, err := systemlogmonitor.CompilePattern(options.Pattern)
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if err != nil {
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return nil, fmt.Errorf("invalid pattern %q: %w", options.Pattern, err)
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}
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var revertPattern *regexp.Regexp
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if options.RevertPattern != "" {
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revertPattern, err = systemlogmonitor.CompilePattern(options.RevertPattern)
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if err != nil {
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return nil, fmt.Errorf("invalid revert pattern %q: %w", options.RevertPattern, err)
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}
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}
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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: pattern,
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revertPattern: 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 != nil && 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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