91 lines
2.7 KiB
Go
91 lines
2.7 KiB
Go
/*
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Copyright 2017 the Heptio Ark contributors.
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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 restore
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import (
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"time"
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"github.com/pkg/errors"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/watch"
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)
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// how long should we wait for certain objects (e.g. PVs, PVCs) to reach
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// their specified conditions before continuing on.
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const objectCreateWaitTimeout = 30 * time.Second
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// resourceWaiter knows how to wait for a set of registered items to become "ready" (according
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// to a provided readyFunc) based on listening to a channel of Events. The correct usage
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// of this struct is to construct it, register all of the desired items to wait for via
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// RegisterItem, and then to Wait() for them to become ready or the timeout to be exceeded.
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type resourceWaiter struct {
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itemWatch watch.Interface
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watchChan <-chan watch.Event
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items sets.String
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readyFunc func(runtime.Unstructured) bool
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}
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func newResourceWaiter(itemWatch watch.Interface, readyFunc func(runtime.Unstructured) bool) *resourceWaiter {
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return &resourceWaiter{
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itemWatch: itemWatch,
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watchChan: itemWatch.ResultChan(),
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items: sets.NewString(),
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readyFunc: readyFunc,
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}
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}
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// RegisterItem adds the specified key to a list of items to listen for events for.
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func (rw *resourceWaiter) RegisterItem(key string) {
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rw.items.Insert(key)
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}
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// Wait listens for events on the watchChan related to items that have been registered,
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// and returns when either all of them have become ready according to readyFunc, or when
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// the timeout has been exceeded.
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func (rw *resourceWaiter) Wait() error {
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for {
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if rw.items.Len() <= 0 {
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return nil
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}
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timeout := time.NewTimer(objectCreateWaitTimeout)
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select {
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case event := <-rw.watchChan:
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obj, ok := event.Object.(*unstructured.Unstructured)
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if !ok {
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return errors.Errorf("Unexpected type %T", event.Object)
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}
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if event.Type == watch.Added || event.Type == watch.Modified {
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if rw.items.Has(obj.GetName()) && rw.readyFunc(obj) {
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rw.items.Delete(obj.GetName())
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}
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}
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case <-timeout.C:
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return errors.New("failed to observe all items becoming ready within the timeout")
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}
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}
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}
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func (rw *resourceWaiter) Stop() {
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rw.itemWatch.Stop()
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}
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