mirror of
https://github.com/k3s-io/kubernetes.git
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118 lines
3.3 KiB
Go
118 lines
3.3 KiB
Go
/*
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Copyright 2025 The Kubernetes Authors.
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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 apidispatcher
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import (
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"context"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/klog/v2"
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fwk "k8s.io/kube-scheduler/framework"
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"k8s.io/kubernetes/pkg/scheduler/metrics"
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)
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// APIDispatcher implements the fwk.APIDispatcher interface and allows for queueing and dispatching API calls asynchronously.
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type APIDispatcher struct {
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cancel func()
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client clientset.Interface
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callQueue *callQueue
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}
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// New returns a new APIDispatcher object.
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func New(client clientset.Interface, parallelization int, apiCallRelevances fwk.APICallRelevances) *APIDispatcher {
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d := APIDispatcher{
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client: client,
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callQueue: newCallQueue(apiCallRelevances),
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}
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return &d
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}
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// Add adds an API call to the dispatcher's queue. It returns an error if the call is not enqueued
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// (e.g., if it's skipped). The caller should handle ErrCallSkipped if returned.
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func (ad *APIDispatcher) Add(newAPICall fwk.APICall, opts fwk.APICallOptions) error {
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apiCall := &queuedAPICall{
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APICall: newAPICall,
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onFinish: opts.OnFinish,
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}
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return ad.callQueue.add(apiCall)
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}
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// SyncObject performs a two-way synchronization between the given object
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// and a pending API call held within the dispatcher and returns the modified object.
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func (ad *APIDispatcher) SyncObject(obj metav1.Object) (metav1.Object, error) {
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return ad.callQueue.syncObject(obj)
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}
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// Run starts the main processing loop of the APIDispatcher, which pops calls
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// from the queue and dispatches them to worker goroutines for execution.
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func (ad *APIDispatcher) Run(logger klog.Logger) {
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// Create a new context to allow to cancel the APICalls' execution when the APIDispatcher is closed.
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ctx, cancel := context.WithCancel(context.Background())
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ad.cancel = cancel
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go func() {
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for {
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select {
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case <-ctx.Done():
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// APIDispatcher is closed.
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return
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default:
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}
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apiCall, err := ad.callQueue.pop()
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if err != nil {
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utilruntime.HandleErrorWithLogger(logger, err, "popping API call from call controller failed")
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continue
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}
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if apiCall == nil {
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// callController is closed.
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return
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}
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go func() {
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startTime := time.Now()
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err := apiCall.Execute(ctx, ad.client)
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result := metrics.GoroutineResultSuccess
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if err != nil {
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result = metrics.GoroutineResultError
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}
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callType := string(apiCall.CallType())
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metrics.AsyncAPICallsTotal.WithLabelValues(callType, result).Inc()
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metrics.AsyncAPICallDuration.WithLabelValues(callType, result).Observe(time.Since(startTime).Seconds())
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ad.callQueue.finalize(apiCall)
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apiCall.sendOnFinish(err)
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}()
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}
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}()
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}
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// Close shuts down the APIDispatcher.
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func (ad *APIDispatcher) Close() {
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ad.callQueue.close()
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if ad.cancel != nil {
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ad.cancel()
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}
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}
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