mirror of https://github.com/grpc/grpc-go.git
48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
/*
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*
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* Copyright 2020 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 client
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import (
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"fmt"
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"time"
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)
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type rdsUpdate struct {
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clusterName string
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}
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type rdsCallbackFunc func(rdsUpdate, error)
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// watchRDS starts a listener watcher for the service..
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//
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// Note that during race (e.g. an xDS response is received while the user is
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// calling cancel()), there's a small window where the callback can be called
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// after the watcher is canceled. The caller needs to handle this case.
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func (c *Client) watchRDS(routeName string, cb rdsCallbackFunc) (cancel func()) {
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wi := &watchInfo{
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typeURL: rdsURL,
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target: routeName,
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rdsCallback: cb,
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}
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wi.expiryTimer = time.AfterFunc(defaultWatchExpiryTimeout, func() {
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c.scheduleCallback(wi, rdsUpdate{}, fmt.Errorf("xds: RDS target %s not found, watcher timeout", routeName))
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})
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return c.watch(wi)
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}
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