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/*
*
* Copyright 2019 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 implements a full fledged gRPC client for the xDS API used
// by the xds resolver and balancer implementations.
package xdsclient
import (
"google.golang.org/grpc/xds/internal/xdsclient/bootstrap"
"google.golang.org/grpc/xds/internal/xdsclient/load"
"google.golang.org/grpc/xds/internal/xdsclient/xdsresource"
)
// XDSClient is a full fledged gRPC client which queries a set of discovery APIs
// (collectively termed as xDS) on a remote management server, to discover
// various dynamic resources.
type XDSClient interface {
WatchListener(string, func(xdsresource.ListenerUpdate, error)) func()
WatchRouteConfig(string, func(xdsresource.RouteConfigUpdate, error)) func()
WatchCluster(string, func(xdsresource.ClusterUpdate, error)) func()
WatchEndpoints(string, func(xdsresource.EndpointsUpdate, error)) func()
// WatchResource uses xDS to discover the resource associated with the
// provided resource name. The resource type implementation determines how
// xDS requests are sent out and how responses are deserialized and
// validated. Upon receipt of a response from the management server, an
// appropriate callback on the watcher is invoked.
//
// Most callers will not have a need to use this API directly. They will
// instead use a resource-type-specific wrapper API provided by the relevant
// resource type implementation.
//
//
// During a 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. Callers need to handle this case.
//
// TODO: Once this generic client API is fully implemented and integrated,
// delete the resource type specific watch APIs on this interface.
WatchResource(rType xdsresource.Type, resourceName string, watcher xdsresource.ResourceWatcher) (cancel func())
// DumpResources returns the status of the xDS resources. Returns a map of
// resource type URLs to a map of resource names to resource state.
DumpResources() map[string]map[string]xdsresource.UpdateWithMD
ReportLoad(*bootstrap.ServerConfig) (*load.Store, func())
BootstrapConfig() *bootstrap.Config
}
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