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/*
*
* Copyright 2023 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package testutils
import "google.golang.org/grpc/xds/internal/xdsclient/xdsresource"
// TestResourceWatcher implements the xdsresource.ResourceWatcher interface,
// used to receive updates on watches registered with the xDS client, when using
// the resource-type agnostic WatchResource API.
//
// Tests can the channels provided by this tyep to get access to updates and
// errors sent by the xDS client.
type TestResourceWatcher struct {
// UpdateCh is the channel on which xDS client updates are delivered.
UpdateCh chan *xdsresource.ResourceData
// ErrorCh is the channel on which errors from the xDS client are delivered.
ErrorCh chan error
// ResourceDoesNotExistCh is the channel used to indicate calls to OnResourceDoesNotExist
ResourceDoesNotExistCh chan struct{}
}
// OnUpdate is invoked by the xDS client to report the latest update on the resource
// being watched.
func (w *TestResourceWatcher) OnUpdate(data xdsresource.ResourceData) {
select {
case <-w.UpdateCh:
default:
}
w.UpdateCh <- &data
}
// OnError is invoked by the xDS client to report the latest error.
func (w *TestResourceWatcher) OnError(err error) {
select {
case <-w.ErrorCh:
default:
}
w.ErrorCh <- err
}
// OnResourceDoesNotExist is used by the xDS client to report that the resource
// being watched no longer exists.
func (w *TestResourceWatcher) OnResourceDoesNotExist() {
select {
case <-w.ResourceDoesNotExistCh:
default:
}
w.ResourceDoesNotExistCh <- struct{}{}
}
// NewTestResourceWatcher returns a TestResourceWatcher to watch for resources
// via the xDS client.
func NewTestResourceWatcher() *TestResourceWatcher {
return &TestResourceWatcher{
UpdateCh: make(chan *xdsresource.ResourceData, 1),
ErrorCh: make(chan error, 1),
ResourceDoesNotExistCh: make(chan struct{}, 1),
}
}
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