mirror of https://github.com/k3s-io/k3s
84 lines
2.7 KiB
Go
84 lines
2.7 KiB
Go
/*
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Copyright 2015 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 service
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import (
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log "github.com/golang/glog"
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"k8s.io/kubernetes/pkg/kubelet"
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kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
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"k8s.io/kubernetes/pkg/util"
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)
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// executorKubelet decorates the kubelet with a Run function that notifies the
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// executor by closing kubeletDone before entering blocking state.
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type executorKubelet struct {
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*kubelet.Kubelet
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kubeletDone chan<- struct{} // closed once kubelet.Run() returns
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executorDone <-chan struct{} // closed when executor terminates
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}
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// Run runs the main kubelet loop, closing the kubeletFinished chan when the
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// loop exits. Like the upstream Run, it will never return.
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func (kl *executorKubelet) Run(mergedUpdates <-chan kubetypes.PodUpdate) {
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defer func() {
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// When this Run function is called, we close it here.
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// Otherwise, KubeletExecutorServer.runKubelet will.
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close(kl.kubeletDone)
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util.HandleCrash()
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log.Infoln("kubelet run terminated") //TODO(jdef) turn down verbosity
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// important: never return! this is in our contract
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select {}
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}()
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// push merged updates into another, closable update channel which is closed
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// when the executor shuts down.
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closableUpdates := make(chan kubetypes.PodUpdate)
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go func() {
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// closing closableUpdates will cause our patched kubelet's syncLoop() to exit
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defer close(closableUpdates)
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pipeLoop:
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for {
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select {
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case <-kl.executorDone:
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break pipeLoop
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default:
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select {
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case u := <-mergedUpdates:
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select {
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case closableUpdates <- u: // noop
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case <-kl.executorDone:
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break pipeLoop
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}
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case <-kl.executorDone:
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break pipeLoop
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}
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}
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}
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}()
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// we expect that Run() will complete after closableUpdates is closed and the
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// kubelet's syncLoop() has finished processing its backlog, which hopefully
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// will not take very long. Peeking into the future (current k8s master) it
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// seems that the backlog has grown from 1 to 50 -- this may negatively impact
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// us going forward, time will tell.
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util.Until(func() { kl.Kubelet.Run(closableUpdates) }, 0, kl.executorDone)
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//TODO(jdef) revisit this if/when executor failover lands
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// Force kubelet to delete all pods.
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kl.HandlePodDeletions(kl.GetPods())
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}
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