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95 lines
3.7 KiB
Go
95 lines
3.7 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 xds contains an implementation of the xDS suite of protocols, to be
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// used by gRPC client and server applications.
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//
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// On the client-side, users simply need to import this package to get all xDS
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// functionality. On the server-side, users need to use the GRPCServer type
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// exported by this package instead of the regular grpc.Server.
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//
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// See https://github.com/grpc/grpc-go/tree/master/examples/features/xds for
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// example.
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package xds
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import (
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"fmt"
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v3statusgrpc "github.com/envoyproxy/go-control-plane/envoy/service/status/v3"
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"google.golang.org/grpc"
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internaladmin "google.golang.org/grpc/internal/admin"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/xds/csds"
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_ "google.golang.org/grpc/credentials/tls/certprovider/pemfile" // Register the file watcher certificate provider plugin.
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_ "google.golang.org/grpc/xds/internal/balancer" // Register the balancers.
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_ "google.golang.org/grpc/xds/internal/httpfilter/fault" // Register the fault injection filter.
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_ "google.golang.org/grpc/xds/internal/httpfilter/rbac" // Register the RBAC filter.
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_ "google.golang.org/grpc/xds/internal/httpfilter/router" // Register the router filter.
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xdsresolver "google.golang.org/grpc/xds/internal/resolver" // Register the xds_resolver.
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_ "google.golang.org/grpc/xds/internal/xdsclient/v2" // Register the v2 xDS API client.
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_ "google.golang.org/grpc/xds/internal/xdsclient/v3" // Register the v3 xDS API client.
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)
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func init() {
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internaladmin.AddService(func(registrar grpc.ServiceRegistrar) (func(), error) {
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var grpcServer *grpc.Server
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switch ss := registrar.(type) {
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case *grpc.Server:
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grpcServer = ss
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case *GRPCServer:
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sss, ok := ss.gs.(*grpc.Server)
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if !ok {
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logger.Warningf("grpc server within xds.GRPCServer is not *grpc.Server, CSDS will not be registered")
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return nil, nil
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}
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grpcServer = sss
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default:
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// Returning an error would cause the top level admin.Register() to
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// fail. Log a warning instead.
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logger.Warningf("server to register service on is neither a *grpc.Server or a *xds.GRPCServer, CSDS will not be registered")
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return nil, nil
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}
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csdss, err := csds.NewClientStatusDiscoveryServer()
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if err != nil {
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return nil, fmt.Errorf("failed to create csds server: %v", err)
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}
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v3statusgrpc.RegisterClientStatusDiscoveryServiceServer(grpcServer, csdss)
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return csdss.Close, nil
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})
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}
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// NewXDSResolverWithConfigForTesting creates a new xds resolver builder using
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// the provided xds bootstrap config instead of the global configuration from
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// the supported environment variables. The resolver.Builder is meant to be
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// used in conjunction with the grpc.WithResolvers DialOption.
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//
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// Testing Only
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//
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// This function should ONLY be used for testing and may not work with some
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// other features, including the CSDS service.
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//
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// Experimental
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//
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// Notice: This API is EXPERIMENTAL and may be changed or removed in a
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// later release.
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func NewXDSResolverWithConfigForTesting(bootstrapConfig []byte) (resolver.Builder, error) {
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return xdsresolver.NewBuilder(bootstrapConfig)
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}
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