mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-08-23 14:16:35 +00:00
Veer Singh
4334390423
The log buffer joins every buffered line and scans all of them for each pattern on every push, which is wasted work when a pattern cannot even match across lines. The buffer now caches the joined string, and Push invalidates the cache. CompilePattern marks the patterns that cannot match across lines (no start anchor, no way to match a newline, and the appended \z anchor binds every branch) and Match checks them against the most recent line alone.
71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
/*
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Copyright 2016 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 systemlogmonitor
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import (
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watchertypes "k8s.io/node-problem-detector/pkg/systemlogmonitor/logwatchers/types"
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systemlogtypes "k8s.io/node-problem-detector/pkg/systemlogmonitor/types"
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"k8s.io/node-problem-detector/pkg/types"
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)
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var (
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defaultBufferSize = 10
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defaultLookback = "0"
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defaultEnableMetricsReporting = true
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)
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// MonitorConfig is the configuration of log monitor.
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type MonitorConfig struct {
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// WatcherConfig is the configuration of log watcher.
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watchertypes.WatcherConfig
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// BufferSize is the size (in lines) of the log buffer.
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BufferSize int `json:"bufferSize"`
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// Source is the source name of the log monitor
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Source string `json:"source"`
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// DefaultConditions are the default states of all the conditions log monitor should handle.
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DefaultConditions []types.Condition `json:"conditions"`
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// Rules are the rules log monitor will follow to parse the log file.
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Rules []systemlogtypes.Rule `json:"rules"`
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// EnableMetricsReporting describes whether to report problems as metrics or not.
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EnableMetricsReporting *bool `json:"metricsReporting,omitempty"`
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}
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// ApplyDefaultConfiguration applies default configurations.
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func (mc *MonitorConfig) ApplyDefaultConfiguration() {
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if mc.BufferSize == 0 {
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mc.BufferSize = defaultBufferSize
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}
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if mc.EnableMetricsReporting == nil {
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mc.EnableMetricsReporting = &defaultEnableMetricsReporting
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}
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if mc.Lookback == "" {
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mc.Lookback = defaultLookback
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}
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}
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func (mc MonitorConfig) compileRules() ([]*Pattern, error) {
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patterns := make([]*Pattern, len(mc.Rules))
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for i, rule := range mc.Rules {
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pattern, err := CompilePattern(rule.Pattern)
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if err != nil {
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return nil, err
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}
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patterns[i] = pattern
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}
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return patterns, nil
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}
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