mirror of
https://github.com/kubernetes/client-go.git
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83 lines
3.1 KiB
Go
83 lines
3.1 KiB
Go
/*
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Copyright 2024 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 watchlist
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import (
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metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
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metainternalversionvalidation "k8s.io/apimachinery/pkg/apis/meta/internalversion/validation"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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clientfeatures "k8s.io/client-go/features"
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"k8s.io/utils/ptr"
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)
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var scheme = runtime.NewScheme()
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func init() {
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utilruntime.Must(metainternalversion.AddToScheme(scheme))
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}
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// PrepareWatchListOptionsFromListOptions creates a new ListOptions
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// that can be used for a watch-list request from the given listOptions.
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//
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// This function also determines if the given listOptions can be used to form a watch-list request,
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// which would result in streaming semantically equivalent data from the server.
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func PrepareWatchListOptionsFromListOptions(listOptions metav1.ListOptions) (metav1.ListOptions, bool, error) {
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if !clientfeatures.FeatureGates().Enabled(clientfeatures.WatchListClient) {
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return metav1.ListOptions{}, false, nil
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}
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internalListOptions := &metainternalversion.ListOptions{}
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if err := scheme.Convert(&listOptions, internalListOptions, nil); err != nil {
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return metav1.ListOptions{}, false, err
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}
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if errs := metainternalversionvalidation.ValidateListOptions(internalListOptions, true); len(errs) > 0 {
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return metav1.ListOptions{}, false, nil
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}
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watchListOptions := listOptions
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// this is our legacy case, the cache ignores LIMIT for
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// ResourceVersion == 0 and RVM=unset|NotOlderThan
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if listOptions.Limit > 0 && listOptions.ResourceVersion != "0" {
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return metav1.ListOptions{}, false, nil
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}
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watchListOptions.Limit = 0
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// to ensure that we can create a watch-list request that returns
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// semantically equivalent data for the given listOptions,
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// we need to validate that the RVM for the list is supported by watch-list requests.
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if listOptions.ResourceVersionMatch == metav1.ResourceVersionMatchExact {
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return metav1.ListOptions{}, false, nil
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}
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watchListOptions.ResourceVersionMatch = metav1.ResourceVersionMatchNotOlderThan
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watchListOptions.Watch = true
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watchListOptions.AllowWatchBookmarks = true
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watchListOptions.SendInitialEvents = ptr.To(true)
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internalWatchListOptions := &metainternalversion.ListOptions{}
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if err := scheme.Convert(&watchListOptions, internalWatchListOptions, nil); err != nil {
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return metav1.ListOptions{}, false, err
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}
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if errs := metainternalversionvalidation.ValidateListOptions(internalWatchListOptions, true); len(errs) > 0 {
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return metav1.ListOptions{}, false, nil
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}
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return watchListOptions, true, nil
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}
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