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clientimpl_watchers.go
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/
clientimpl_watchers.go
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/*
*
* Copyright 2020 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 xdsclient
import (
"google.golang.org/grpc/xds/internal/xdsclient/xdsresource"
)
// WatchListener uses LDS to discover information about the provided listener.
//
// Note that during race (e.g. an xDS response is received while the user is
// calling cancel()), there's a small window where the callback can be called
// after the watcher is canceled. The caller needs to handle this case.
func (c *clientImpl) WatchListener(serviceName string, cb func(xdsresource.ListenerUpdate, error)) (cancel func()) {
n := xdsresource.ParseName(serviceName)
a, unref, err := c.findAuthority(n)
if err != nil {
cb(xdsresource.ListenerUpdate{}, err)
return func() {}
}
cancelF := a.watchListener(n.String(), cb)
return func() {
cancelF()
unref()
}
}
// WatchRouteConfig starts a listener watcher for the service.
//
// Note that during race (e.g. an xDS response is received while the user is
// calling cancel()), there's a small window where the callback can be called
// after the watcher is canceled. The caller needs to handle this case.
func (c *clientImpl) WatchRouteConfig(routeName string, cb func(xdsresource.RouteConfigUpdate, error)) (cancel func()) {
n := xdsresource.ParseName(routeName)
a, unref, err := c.findAuthority(n)
if err != nil {
cb(xdsresource.RouteConfigUpdate{}, err)
return func() {}
}
cancelF := a.watchRouteConfig(n.String(), cb)
return func() {
cancelF()
unref()
}
}
// WatchCluster uses CDS to discover information about the provided
// clusterName.
//
// WatchCluster can be called multiple times, with same or different
// clusterNames. Each call will start an independent watcher for the resource.
//
// Note that during race (e.g. an xDS response is received while the user is
// calling cancel()), there's a small window where the callback can be called
// after the watcher is canceled. The caller needs to handle this case.
func (c *clientImpl) WatchCluster(clusterName string, cb func(xdsresource.ClusterUpdate, error)) (cancel func()) {
n := xdsresource.ParseName(clusterName)
a, unref, err := c.findAuthority(n)
if err != nil {
cb(xdsresource.ClusterUpdate{}, err)
return func() {}
}
cancelF := a.watchCluster(n.String(), cb)
return func() {
cancelF()
unref()
}
}
// WatchEndpoints uses EDS to discover endpoints in the provided clusterName.
//
// WatchEndpoints can be called multiple times, with same or different
// clusterNames. Each call will start an independent watcher for the resource.
//
// Note that during race (e.g. an xDS response is received while the user is
// calling cancel()), there's a small window where the callback can be called
// after the watcher is canceled. The caller needs to handle this case.
func (c *clientImpl) WatchEndpoints(clusterName string, cb func(xdsresource.EndpointsUpdate, error)) (cancel func()) {
n := xdsresource.ParseName(clusterName)
a, unref, err := c.findAuthority(n)
if err != nil {
cb(xdsresource.EndpointsUpdate{}, err)
return func() {}
}
cancelF := a.watchEndpoints(n.String(), cb)
return func() {
cancelF()
unref()
}
}