mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-02-27 00:04:01 +00:00
108 lines
3.2 KiB
Go
108 lines
3.2 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 problemdetector
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import (
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"fmt"
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"net/http"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/util/clock"
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"k8s.io/node-problem-detector/pkg/condition"
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"k8s.io/node-problem-detector/pkg/problemclient"
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"k8s.io/node-problem-detector/pkg/systemlogmonitor"
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"k8s.io/node-problem-detector/pkg/types"
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"k8s.io/node-problem-detector/pkg/util"
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)
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// ProblemDetector collects statuses from all problem daemons and update the node condition and send node event.
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type ProblemDetector interface {
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Run() error
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RegisterHTTPHandlers()
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}
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type problemDetector struct {
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client problemclient.Client
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conditionManager condition.ConditionManager
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monitors map[string]systemlogmonitor.LogMonitor
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}
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// NewProblemDetector creates the problem detector. Currently we just directly passed in the problem daemons, but
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// in the future we may want to let the problem daemons register themselves.
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func NewProblemDetector(monitors map[string]systemlogmonitor.LogMonitor, client problemclient.Client) ProblemDetector {
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return &problemDetector{
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client: client,
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conditionManager: condition.NewConditionManager(client, clock.RealClock{}),
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monitors: monitors,
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}
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}
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// Run starts the problem detector.
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func (p *problemDetector) Run() error {
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p.conditionManager.Start()
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// Start the log monitors one by one.
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var chans []<-chan *types.Status
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for cfg, m := range p.monitors {
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ch, err := m.Start()
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if err != nil {
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// Do not return error and keep on trying the following config files.
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glog.Errorf("Failed to start log monitor %q: %v", cfg, err)
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continue
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}
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chans = append(chans, ch)
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}
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if len(chans) == 0 {
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return fmt.Errorf("no log montior is successfully setup")
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}
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ch := groupChannel(chans)
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glog.Info("Problem detector started")
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for {
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select {
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case status := <-ch:
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for _, event := range status.Events {
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p.client.Eventf(util.ConvertToAPIEventType(event.Severity), status.Source, event.Reason, event.Message)
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}
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for _, condition := range status.Conditions {
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p.conditionManager.UpdateCondition(condition)
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}
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}
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}
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}
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// RegisterHTTPHandlers registers http handlers of node problem detector.
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func (p *problemDetector) RegisterHTTPHandlers() {
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// Add the handler to serve condition http request.
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http.HandleFunc("/conditions", func(w http.ResponseWriter, r *http.Request) {
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util.ReturnHTTPJson(w, p.conditionManager.GetConditions())
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})
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}
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func groupChannel(chans []<-chan *types.Status) <-chan *types.Status {
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statuses := make(chan *types.Status)
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for _, ch := range chans {
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go func(c <-chan *types.Status) {
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for status := range c {
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statuses <- status
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}
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}(ch)
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}
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return statuses
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}
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