admin: implement admin services (#4274)

admin/admin.go

@@ -0,0 +1,57 @@
+/*
+ *
+ * Copyright 2021 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 admin provides a convenient method for registering a collection of
+// administration services to a gRPC server. The services registered are:
+//
+// - Channelz: https://github.com/grpc/proposal/blob/master/A14-channelz.md
+// - CSDS: https://github.com/grpc/proposal/blob/master/A40-csds-support.md
+//
+// Experimental
+//
+// Notice: All APIs in this package are experimental and may be removed in a
+// later release.
+package admin
+
+import (
+	"google.golang.org/grpc"
+	channelzservice "google.golang.org/grpc/channelz/service"
+	internaladmin "google.golang.org/grpc/internal/admin"
+)
+
+func init() {
+	// Add a list of default services to admin here. Optional services, like
+	// CSDS, will be added by other packages.
+	internaladmin.AddService(func(registrar grpc.ServiceRegistrar) (func(), error) {
+		channelzservice.RegisterChannelzServiceToServer(registrar)
+		return nil, nil
+	})
+}
+
+// Register registers the set of admin services to the given server.
+//
+// The returned cleanup function should be called to clean up the resources
+// allocated for the service handlers after the server is stopped.
+//
+// Note that if `s` is not a *grpc.Server or a *xds.GRPCServer, CSDS will not be
+// registered because CSDS generated code is old and doesn't support interface
+// `grpc.ServiceRegistrar`.
+// https://github.com/envoyproxy/go-control-plane/issues/403
+func Register(s grpc.ServiceRegistrar) (cleanup func(), _ error) {
+	return internaladmin.Register(s)
+}

admin/admin_test.go

@@ -0,0 +1,34 @@
+/*
+ *
+ * Copyright 2021 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 admin_test
+
+import (
+	"testing"
+
+	"google.golang.org/grpc/admin/test"
+	"google.golang.org/grpc/codes"
+)
+
+func TestRegisterNoCSDS(t *testing.T) {
+	test.RunRegisterTests(t, test.ExpectedStatusCodes{
+		ChannelzCode: codes.OK,
+		// CSDS is not registered because xDS isn't imported.
+		CSDSCode: codes.Unimplemented,
+	})
+}

admin/test/admin_test.go

@@ -0,0 +1,38 @@
+/*
+ *
+ * Copyright 2021 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.
+ *
+ */
+
+// This file has the same content as admin_test.go, difference is that this is
+// in another package, and it imports "xds", so we can test that csds is
+// registered when xds is imported.
+
+package test_test
+
+import (
+	"testing"
+
+	"google.golang.org/grpc/admin/test"
+	"google.golang.org/grpc/codes"
+	_ "google.golang.org/grpc/xds"
+)
+
+func TestRegisterWithCSDS(t *testing.T) {
+	test.RunRegisterTests(t, test.ExpectedStatusCodes{
+		ChannelzCode: codes.OK,
+		CSDSCode:     codes.OK,
+	})
+}

admin/test/utils.go

@@ -0,0 +1,113 @@
+/*
+ *
+ * Copyright 2021 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 test contains test only functions for package admin. It's used by
+// admin/admin_test.go and admin/test/admin_test.go.
+package test
+
+import (
+	"context"
+	"net"
+	"testing"
+	"time"
+
+	v3statuspb "github.com/envoyproxy/go-control-plane/envoy/service/status/v3"
+	"github.com/google/uuid"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/admin"
+	channelzpb "google.golang.org/grpc/channelz/grpc_channelz_v1"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/internal/xds"
+	"google.golang.org/grpc/status"
+)
+
+const (
+	defaultTestTimeout = 10 * time.Second
+)
+
+// ExpectedStatusCodes contains the expected status code for each RPC (can be
+// OK).
+type ExpectedStatusCodes struct {
+	ChannelzCode codes.Code
+	CSDSCode     codes.Code
+}
+
+// RunRegisterTests makes a client, runs the RPCs, and compares the status
+// codes.
+func RunRegisterTests(t *testing.T, ec ExpectedStatusCodes) {
+	nodeID := uuid.New().String()
+	bootstrapCleanup, err := xds.SetupBootstrapFile(xds.BootstrapOptions{
+		Version:   xds.TransportV3,
+		NodeID:    nodeID,
+		ServerURI: "no.need.for.a.server",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer bootstrapCleanup()
+
+	lis, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		t.Fatalf("cannot create listener: %v", err)
+	}
+
+	server := grpc.NewServer()
+	defer server.Stop()
+	cleanup, err := admin.Register(server)
+	if err != nil {
+		t.Fatalf("failed to register admin: %v", err)
+	}
+	defer cleanup()
+	go func() {
+		server.Serve(lis)
+	}()
+
+	conn, err := grpc.Dial(lis.Addr().String(), grpc.WithInsecure())
+	if err != nil {
+		t.Fatalf("cannot connect to server: %v", err)
+	}
+
+	t.Run("channelz", func(t *testing.T) {
+		if err := RunChannelz(conn); status.Code(err) != ec.ChannelzCode {
+			t.Fatalf("%s RPC failed with error %v, want code %v", "channelz", err, ec.ChannelzCode)
+		}
+	})
+	t.Run("csds", func(t *testing.T) {
+		if err := RunCSDS(conn); status.Code(err) != ec.CSDSCode {
+			t.Fatalf("%s RPC failed with error %v, want code %v", "CSDS", err, ec.CSDSCode)
+		}
+	})
+}
+
+// RunChannelz makes a channelz RPC.
+func RunChannelz(conn *grpc.ClientConn) error {
+	c := channelzpb.NewChannelzClient(conn)
+	ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
+	defer cancel()
+	_, err := c.GetTopChannels(ctx, &channelzpb.GetTopChannelsRequest{}, grpc.WaitForReady(true))
+	return err
+}
+
+// RunCSDS makes a CSDS RPC.
+func RunCSDS(conn *grpc.ClientConn) error {
+	c := v3statuspb.NewClientStatusDiscoveryServiceClient(conn)
+	ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
+	defer cancel()
+	_, err := c.FetchClientStatus(ctx, &v3statuspb.ClientStatusRequest{}, grpc.WaitForReady(true))
+	return err
+}

channelz/service/service.go

@@ -43,7 +43,7 @@ func init() {
 var logger = grpclog.Component("channelz")
 
 // RegisterChannelzServiceToServer registers the channelz service to the given server.
-func RegisterChannelzServiceToServer(s *grpc.Server) {
+func RegisterChannelzServiceToServer(s grpc.ServiceRegistrar) {
 	channelzgrpc.RegisterChannelzServer(s, newCZServer())
 }
 

internal/admin/admin.go

@@ -0,0 +1,60 @@
+/*
+ *
+ * Copyright 2021 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 admin contains internal implementation for admin service.
+package admin
+
+import "google.golang.org/grpc"
+
+// services is a map from name to service register functions.
+var services []func(grpc.ServiceRegistrar) (func(), error)
+
+// AddService adds a service to the list of admin services.
+//
+// NOTE: this function must only be called during initialization time (i.e. in
+// an init() function), and is not thread-safe.
+//
+// If multiple services with the same service name are added (e.g. two services
+// for `grpc.channelz.v1.Channelz`), the server will panic on `Register()`.
+func AddService(f func(grpc.ServiceRegistrar) (func(), error)) {
+	services = append(services, f)
+}
+
+// Register registers the set of admin services to the given server.
+func Register(s grpc.ServiceRegistrar) (cleanup func(), _ error) {
+	var cleanups []func()
+	for _, f := range services {
+		cleanup, err := f(s)
+		if err != nil {
+			callFuncs(cleanups)
+			return nil, err
+		}
+		if cleanup != nil {
+			cleanups = append(cleanups, cleanup)
+		}
+	}
+	return func() {
+		callFuncs(cleanups)
+	}, nil
+}
+
+func callFuncs(fs []func()) {
+	for _, f := range fs {
+		f()
+	}
+}

internal/xds/bootstrap.go

@@ -0,0 +1,134 @@
+/*
+ *
+ * Copyright 2021 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 xds
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/xds/env"
+)
+
+var logger = grpclog.Component("internal/xds")
+
+// TransportAPI refers to the API version for xDS transport protocol.
+type TransportAPI int
+
+const (
+	// TransportV2 refers to the v2 xDS transport protocol.
+	TransportV2 TransportAPI = iota
+	// TransportV3 refers to the v3 xDS transport protocol.
+	TransportV3
+)
+
+// BootstrapOptions wraps the parameters passed to SetupBootstrapFile.
+type BootstrapOptions struct {
+	// Version is the xDS transport protocol version.
+	Version TransportAPI
+	// NodeID is the node identifier of the gRPC client/server node in the
+	// proxyless service mesh.
+	NodeID string
+	// ServerURI is the address of the management server.
+	ServerURI string
+	// ServerListenerResourceNameTemplate is the Listener resource name to fetch.
+	ServerListenerResourceNameTemplate string
+	// CertificateProviders is the certificate providers configuration.
+	CertificateProviders map[string]json.RawMessage
+}
+
+// SetupBootstrapFile creates a temporary file with bootstrap contents, based on
+// the passed in options, and updates the bootstrap environment variable to
+// point to this file.
+//
+// Returns a cleanup function which will be non-nil if the setup process was
+// completed successfully. It is the responsibility of the caller to invoke the
+// cleanup function at the end of the test.
+func SetupBootstrapFile(opts BootstrapOptions) (func(), error) {
+	f, err := ioutil.TempFile("", "test_xds_bootstrap_*")
+	if err != nil {
+		return nil, fmt.Errorf("failed to created bootstrap file: %v", err)
+	}
+
+	cfg := &bootstrapConfig{
+		XdsServers: []server{
+			{
+				ServerURI: opts.ServerURI,
+				ChannelCreds: []creds{
+					{
+						Type: "insecure",
+					},
+				},
+			},
+		},
+		Node: node{
+			ID: opts.NodeID,
+		},
+		CertificateProviders:               opts.CertificateProviders,
+		ServerListenerResourceNameTemplate: opts.ServerListenerResourceNameTemplate,
+	}
+	switch opts.Version {
+	case TransportV2:
+		// TODO: Add any v2 specific fields.
+	case TransportV3:
+		cfg.XdsServers[0].ServerFeatures = append(cfg.XdsServers[0].ServerFeatures, "xds_v3")
+	default:
+		return nil, fmt.Errorf("unsupported xDS transport protocol version: %v", opts.Version)
+	}
+
+	bootstrapContents, err := json.MarshalIndent(cfg, "", "  ")
+	if err != nil {
+		return nil, fmt.Errorf("failed to created bootstrap file: %v", err)
+	}
+	if err := ioutil.WriteFile(f.Name(), bootstrapContents, 0644); err != nil {
+		return nil, fmt.Errorf("failed to created bootstrap file: %v", err)
+	}
+	logger.Infof("Created bootstrap file at %q with contents: %s\n", f.Name(), bootstrapContents)
+
+	origBootstrapFileName := env.BootstrapFileName
+	env.BootstrapFileName = f.Name()
+	return func() {
+		os.Remove(f.Name())
+		env.BootstrapFileName = origBootstrapFileName
+	}, nil
+}
+
+type bootstrapConfig struct {
+	XdsServers                         []server                   `json:"xds_servers,omitempty"`
+	Node                               node                       `json:"node,omitempty"`
+	CertificateProviders               map[string]json.RawMessage `json:"certificate_providers,omitempty"`
+	ServerListenerResourceNameTemplate string                     `json:"server_listener_resource_name_template,omitempty"`
+}
+
+type server struct {
+	ServerURI      string   `json:"server_uri,omitempty"`
+	ChannelCreds   []creds  `json:"channel_creds,omitempty"`
+	ServerFeatures []string `json:"server_features,omitempty"`
+}
+
+type creds struct {
+	Type   string      `json:"type,omitempty"`
+	Config interface{} `json:"config,omitempty"`
+}
+
+type node struct {
+	ID string `json:"id,omitempty"`
+}

xds/csds/csds_test.go

@@ -37,6 +37,7 @@ import (
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/google/uuid"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/internal/xds"
 	"google.golang.org/grpc/xds/internal/client"
 	"google.golang.org/grpc/xds/internal/testutils"
 	"google.golang.org/grpc/xds/internal/testutils/e2e"
@@ -255,8 +256,8 @@ func commonSetup(t *testing.T) (xdsClientInterfaceWithWatch, *e2e.ManagementServ
 	}
 
 	// Create a bootstrap file in a temporary directory.
-	bootstrapCleanup, err := e2e.SetupBootstrapFile(e2e.BootstrapOptions{
-		Version:   e2e.TransportV3,
+	bootstrapCleanup, err := xds.SetupBootstrapFile(xds.BootstrapOptions{
+		Version:   xds.TransportV3,
 		NodeID:    nodeID,
 		ServerURI: fs.Address,
 	})

xds/googledirectpath/googlec2p.go

@@ -35,11 +35,11 @@ import (
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/internal/googlecloud"
 	internalgrpclog "google.golang.org/grpc/internal/grpclog"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/resolver"
 	_ "google.golang.org/grpc/xds" // To register xds resolvers and balancers.
 	xdsclient "google.golang.org/grpc/xds/internal/client"
 	"google.golang.org/grpc/xds/internal/client/bootstrap"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/version"
 	"google.golang.org/protobuf/types/known/structpb"
 )

xds/googledirectpath/googlec2p_test.go

@@ -27,9 +27,9 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/xds/internal/client/bootstrap"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/version"
 	"google.golang.org/protobuf/testing/protocmp"
 	"google.golang.org/protobuf/types/known/structpb"

xds/internal/balancer/edsbalancer/eds_impl.go

@@ -31,6 +31,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/internal/grpclog"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/status"
 	"google.golang.org/grpc/xds/internal"
@@ -39,7 +40,6 @@ import (
 	"google.golang.org/grpc/xds/internal/client"
 	xdsclient "google.golang.org/grpc/xds/internal/client"
 	"google.golang.org/grpc/xds/internal/client/load"
-	"google.golang.org/grpc/xds/internal/env"
 )
 
 // TODO: make this a environment variable?

xds/internal/balancer/edsbalancer/eds_impl_test.go

@@ -31,12 +31,12 @@ import (
 	"google.golang.org/grpc/balancer/roundrobin"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/internal/balancer/stub"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/xds/internal"
 	"google.golang.org/grpc/xds/internal/balancer/balancergroup"
 	"google.golang.org/grpc/xds/internal/client"
 	xdsclient "google.golang.org/grpc/xds/internal/client"
 	"google.golang.org/grpc/xds/internal/client/load"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/testutils"
 )
 

xds/internal/client/bootstrap/bootstrap.go

@@ -35,7 +35,7 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/credentials/tls/certprovider"
 	"google.golang.org/grpc/internal"
-	"google.golang.org/grpc/xds/internal/env"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/xds/internal/version"
 )
 

xds/internal/client/bootstrap/bootstrap_test.go

@@ -36,7 +36,7 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/credentials/tls/certprovider"
 	"google.golang.org/grpc/internal"
-	"google.golang.org/grpc/xds/internal/env"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/xds/internal/version"
 )
 

xds/internal/client/cds_test.go

@@ -33,7 +33,7 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	xdsinternal "google.golang.org/grpc/internal/xds"
-	"google.golang.org/grpc/xds/internal/env"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/xds/internal/version"
 	"google.golang.org/protobuf/types/known/wrapperspb"
 )

xds/internal/client/lds_test.go

@@ -31,7 +31,7 @@ import (
 	"github.com/golang/protobuf/ptypes"
 	spb "github.com/golang/protobuf/ptypes/struct"
 	"github.com/google/go-cmp/cmp"
-	"google.golang.org/grpc/xds/internal/env"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/xds/internal/httpfilter"
 	"google.golang.org/grpc/xds/internal/version"
 	"google.golang.org/protobuf/types/known/durationpb"

xds/internal/client/rds_test.go

@@ -34,7 +34,7 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 
-	"google.golang.org/grpc/xds/internal/env"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/xds/internal/httpfilter"
 	"google.golang.org/grpc/xds/internal/version"
 	"google.golang.org/protobuf/types/known/durationpb"

xds/internal/client/xds.go

@@ -41,8 +41,8 @@ import (
 
 	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/xds"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/xds/internal"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/httpfilter"
 	"google.golang.org/grpc/xds/internal/version"
 )

xds/internal/httpfilter/fault/fault.go

@@ -33,9 +33,9 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/internal/grpcrand"
 	iresolver "google.golang.org/grpc/internal/resolver"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/httpfilter"
 	"google.golang.org/protobuf/types/known/anypb"
 

xds/internal/httpfilter/fault/fault_test.go

@@ -37,9 +37,10 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/internal/grpcrand"
 	"google.golang.org/grpc/internal/grpctest"
+	"google.golang.org/grpc/internal/xds"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/httpfilter"
 	"google.golang.org/grpc/xds/internal/testutils"
 	"google.golang.org/grpc/xds/internal/testutils/e2e"
@@ -104,8 +105,8 @@ func clientSetup(t *testing.T) (*e2e.ManagementServer, string, uint32, func()) {
 	}
 
 	// Create a bootstrap file in a temporary directory.
-	bootstrapCleanup, err := e2e.SetupBootstrapFile(e2e.BootstrapOptions{
-		Version:                            e2e.TransportV3,
+	bootstrapCleanup, err := xds.SetupBootstrapFile(xds.BootstrapOptions{
+		Version:                            xds.TransportV3,
 		NodeID:                             nodeID,
 		ServerURI:                          fs.Address,
 		ServerListenerResourceNameTemplate: "grpc/server",

xds/internal/resolver/serviceconfig.go

@@ -28,10 +28,10 @@ import (
 	"google.golang.org/grpc/codes"
 	iresolver "google.golang.org/grpc/internal/resolver"
 	"google.golang.org/grpc/internal/wrr"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/status"
 	"google.golang.org/grpc/xds/internal/balancer/clustermanager"
 	xdsclient "google.golang.org/grpc/xds/internal/client"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/httpfilter"
 	"google.golang.org/grpc/xds/internal/httpfilter/router"
 )

xds/internal/resolver/xds_resolver_test.go

@@ -36,6 +36,7 @@ import (
 	iresolver "google.golang.org/grpc/internal/resolver"
 	"google.golang.org/grpc/internal/testutils"
 	"google.golang.org/grpc/internal/wrr"
+	"google.golang.org/grpc/internal/xds/env"
 	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/serviceconfig"
 	"google.golang.org/grpc/status"
@@ -44,7 +45,6 @@ import (
 	"google.golang.org/grpc/xds/internal/client"
 	xdsclient "google.golang.org/grpc/xds/internal/client"
 	"google.golang.org/grpc/xds/internal/client/bootstrap"
-	"google.golang.org/grpc/xds/internal/env"
 	"google.golang.org/grpc/xds/internal/httpfilter"
 	"google.golang.org/grpc/xds/internal/httpfilter/router"
 	xdstestutils "google.golang.org/grpc/xds/internal/testutils"

xds/internal/test/xds_client_integration_test.go

@@ -28,6 +28,7 @@ import (
 	"github.com/google/uuid"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/internal/xds"
 	"google.golang.org/grpc/xds/internal/testutils"
 	"google.golang.org/grpc/xds/internal/testutils/e2e"
 
@@ -54,8 +55,8 @@ func clientSetup(t *testing.T) (*e2e.ManagementServer, string, uint32, func()) {
 	}
 
 	// Create a bootstrap file in a temporary directory.
-	bootstrapCleanup, err := e2e.SetupBootstrapFile(e2e.BootstrapOptions{
-		Version:   e2e.TransportV3,
+	bootstrapCleanup, err := xds.SetupBootstrapFile(xds.BootstrapOptions{
+		Version:   xds.TransportV3,
 		NodeID:    nodeID,
 		ServerURI: fs.Address,
 	})

xds/internal/test/xds_server_integration_test.go

@@ -38,6 +38,7 @@ import (
 	v3tlspb "github.com/envoyproxy/go-control-plane/envoy/extensions/transport_sockets/tls/v3"
 	wrapperspb "github.com/golang/protobuf/ptypes/wrappers"
 	"github.com/google/uuid"
+	xds2 "google.golang.org/grpc/internal/xds"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/anypb"
 
@@ -150,8 +151,8 @@ func commonSetup(t *testing.T) (*e2e.ManagementServer, string, net.Listener, fun
 	cpc := e2e.DefaultFileWatcherConfig(path.Join(tmpdir, certFile), path.Join(tmpdir, keyFile), path.Join(tmpdir, rootFile))
 
 	// Create a bootstrap file in a temporary directory.
-	bootstrapCleanup, err := e2e.SetupBootstrapFile(e2e.BootstrapOptions{
-		Version:                            e2e.TransportV3,
+	bootstrapCleanup, err := xds2.SetupBootstrapFile(xds2.BootstrapOptions{
+		Version:                            xds2.TransportV3,
 		NodeID:                             nodeID,
 		ServerURI:                          fs.Address,
 		CertificateProviders:               cpc,

xds/internal/testutils/e2e/bootstrap.go

@@ -21,93 +21,8 @@ package e2e
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
-	"os"
-
-	"google.golang.org/grpc/xds/internal/env"
 )
 
-// TransportAPI refers to the API version for xDS transport protocol.
-type TransportAPI int
-
-const (
-	// TransportV2 refers to the v2 xDS transport protocol.
-	TransportV2 TransportAPI = iota
-	// TransportV3 refers to the v3 xDS transport protocol.
-	TransportV3
-)
-
-// BootstrapOptions wraps the parameters passed to SetupBootstrapFile.
-type BootstrapOptions struct {
-	// Version is the xDS transport protocol version.
-	Version TransportAPI
-	// NodeID is the node identifier of the gRPC client/server node in the
-	// proxyless service mesh.
-	NodeID string
-	// ServerURI is the address of the management server.
-	ServerURI string
-	// ServerListenerResourceNameTemplate is the Listener resource name to fetch.
-	ServerListenerResourceNameTemplate string
-	// CertificateProviders is the certificate providers configuration.
-	CertificateProviders map[string]json.RawMessage
-}
-
-// SetupBootstrapFile creates a temporary file with bootstrap contents, based on
-// the passed in options, and updates the bootstrap environment variable to
-// point to this file.
-//
-// Returns a cleanup function which will be non-nil if the setup process was
-// completed successfully. It is the responsibility of the caller to invoke the
-// cleanup function at the end of the test.
-func SetupBootstrapFile(opts BootstrapOptions) (func(), error) {
-	f, err := ioutil.TempFile("", "test_xds_bootstrap_*")
-	if err != nil {
-		return nil, fmt.Errorf("failed to created bootstrap file: %v", err)
-	}
-
-	cfg := &bootstrapConfig{
-		XdsServers: []server{
-			{
-				ServerURI: opts.ServerURI,
-				ChannelCreds: []creds{
-					{
-						Type: "insecure",
-					},
-				},
-			},
-		},
-		Node: node{
-			ID: opts.NodeID,
-		},
-		CertificateProviders:               opts.CertificateProviders,
-		ServerListenerResourceNameTemplate: opts.ServerListenerResourceNameTemplate,
-	}
-	switch opts.Version {
-	case TransportV2:
-		// TODO: Add any v2 specific fields.
-	case TransportV3:
-		cfg.XdsServers[0].ServerFeatures = append(cfg.XdsServers[0].ServerFeatures, "xds_v3")
-	default:
-		return nil, fmt.Errorf("unsupported xDS transport protocol version: %v", opts.Version)
-	}
-
-	bootstrapContents, err := json.MarshalIndent(cfg, "", "  ")
-	if err != nil {
-		return nil, fmt.Errorf("failed to created bootstrap file: %v", err)
-	}
-	if err := ioutil.WriteFile(f.Name(), bootstrapContents, 0644); err != nil {
-		return nil, fmt.Errorf("failed to created bootstrap file: %v", err)
-	}
-	logger.Infof("Created bootstrap file at %q with contents: %s\n", f.Name(), bootstrapContents)
-
-	origBootstrapFileName := env.BootstrapFileName
-	env.BootstrapFileName = f.Name()
-	return func() {
-		os.Remove(f.Name())
-		env.BootstrapFileName = origBootstrapFileName
-	}, nil
-}
-
 // DefaultFileWatcherConfig is a helper function to create a default certificate
 // provider plugin configuration. The test is expected to have setup the files
 // appropriately before this configuration is used to instantiate providers.
@@ -125,25 +40,3 @@ func DefaultFileWatcherConfig(certPath, keyPath, caPath string) map[string]json.
 		"google_cloud_private_spiffe": json.RawMessage(cfg),
 	}
 }
-
-type bootstrapConfig struct {
-	XdsServers                         []server                   `json:"xds_servers,omitempty"`
-	Node                               node                       `json:"node,omitempty"`
-	CertificateProviders               map[string]json.RawMessage `json:"certificate_providers,omitempty"`
-	ServerListenerResourceNameTemplate string                     `json:"server_listener_resource_name_template,omitempty"`
-}
-
-type server struct {
-	ServerURI      string   `json:"server_uri,omitempty"`
-	ChannelCreds   []creds  `json:"channel_creds,omitempty"`
-	ServerFeatures []string `json:"server_features,omitempty"`
-}
-
-type creds struct {
-	Type   string      `json:"type,omitempty"`
-	Config interface{} `json:"config,omitempty"`
-}
-
-type node struct {
-	ID string `json:"id,omitempty"`
-}

xds/xds.go

@@ -28,6 +28,13 @@
 package xds
 
 import (
+	"fmt"
+
+	v3statuspb "github.com/envoyproxy/go-control-plane/envoy/service/status/v3"
+	"google.golang.org/grpc"
+	internaladmin "google.golang.org/grpc/internal/admin"
+	"google.golang.org/grpc/xds/csds"
+
 	_ "google.golang.org/grpc/credentials/tls/certprovider/pemfile" // Register the file watcher certificate provider plugin.
 	_ "google.golang.org/grpc/xds/internal/balancer"                // Register the balancers.
 	_ "google.golang.org/grpc/xds/internal/client/v2"               // Register the v2 xDS API client.
@@ -35,3 +42,32 @@ import (
 	_ "google.golang.org/grpc/xds/internal/httpfilter/fault"        // Register the fault injection filter.
 	_ "google.golang.org/grpc/xds/internal/resolver"                // Register the xds_resolver.
 )
+
+func init() {
+	internaladmin.AddService(func(registrar grpc.ServiceRegistrar) (func(), error) {
+		var grpcServer *grpc.Server
+		switch ss := registrar.(type) {
+		case *grpc.Server:
+			grpcServer = ss
+		case *GRPCServer:
+			sss, ok := ss.gs.(*grpc.Server)
+			if !ok {
+				logger.Warningf("grpc server within xds.GRPCServer is not *grpc.Server, CSDS will not be registered")
+				return nil, nil
+			}
+			grpcServer = sss
+		default:
+			// Returning an error would cause the top level admin.Register() to
+			// fail. Log a warning instead.
+			logger.Warningf("server to register service on is neither a *grpc.Server or a *xds.GRPCServer, CSDS will not be registered")
+			return nil, nil
+		}
+
+		csdss, err := csds.NewClientStatusDiscoveryServer()
+		if err != nil {
+			return nil, fmt.Errorf("failed to create csds server: %v", err)
+		}
+		v3statuspb.RegisterClientStatusDiscoveryServiceServer(grpcServer, csdss)
+		return csdss.Close, nil
+	})
+}