mirror of https://github.com/grpc/grpc-go.git
84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
/*
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*
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* Copyright 2023 gRPC authors.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*/
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package testutils
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import "google.golang.org/grpc/xds/internal/xdsclient/xdsresource"
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// TestResourceWatcher implements the xdsresource.ResourceWatcher interface,
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// used to receive updates on watches registered with the xDS client, when using
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// the resource-type agnostic WatchResource API.
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//
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// Tests can use the channels provided by this type to get access to updates and
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// errors sent by the xDS client.
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type TestResourceWatcher struct {
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// UpdateCh is the channel on which xDS client updates are delivered.
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UpdateCh chan *xdsresource.ResourceData
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// AmbientErrorCh is the channel on which ambient errors from the xDS
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// client are delivered.
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AmbientErrorCh chan error
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// ResourceErrorCh is the channel on which resource errors from the xDS
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// client are delivered.
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ResourceErrorCh chan struct{}
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}
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// ResourceChanged is invoked by the xDS client to report the latest update.
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func (w *TestResourceWatcher) ResourceChanged(data xdsresource.ResourceData, onDone func()) {
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defer onDone()
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select {
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case <-w.UpdateCh:
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default:
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}
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w.UpdateCh <- &data
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}
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// ResourceError is invoked by the xDS client to report the latest error to
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// stop watching the resource.
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func (w *TestResourceWatcher) ResourceError(err error, onDone func()) {
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defer onDone()
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select {
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case <-w.ResourceErrorCh:
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case <-w.AmbientErrorCh:
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default:
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}
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w.AmbientErrorCh <- err
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w.ResourceErrorCh <- struct{}{}
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}
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// AmbientError is invoked by the xDS client to report the latest ambient
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// error.
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func (w *TestResourceWatcher) AmbientError(err error, onDone func()) {
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defer onDone()
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select {
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case <-w.AmbientErrorCh:
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default:
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}
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w.AmbientErrorCh <- err
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}
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// NewTestResourceWatcher returns a TestResourceWatcher to watch for resources
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// via the xDS client.
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func NewTestResourceWatcher() *TestResourceWatcher {
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return &TestResourceWatcher{
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UpdateCh: make(chan *xdsresource.ResourceData, 1),
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AmbientErrorCh: make(chan error, 1),
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ResourceErrorCh: make(chan struct{}, 1),
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}
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}
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