Move services to plugins/services

Signed-off-by: Derek McGowan <derek@mcg.dev>

plugins/services/introspection/service.go

@@ -0,0 +1,74 @@
+/*
+   Copyright The containerd 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 introspection
+
+import (
+	context "context"
+	"errors"
+
+	api "github.com/containerd/containerd/v2/api/services/introspection/v1"
+	"github.com/containerd/containerd/v2/plugins"
+	"github.com/containerd/containerd/v2/plugins/services"
+	ptypes "github.com/containerd/containerd/v2/protobuf/types"
+	"github.com/containerd/plugin"
+	"github.com/containerd/plugin/registry"
+	"google.golang.org/grpc"
+)
+
+func init() {
+	registry.Register(&plugin.Registration{
+		Type:     plugins.GRPCPlugin,
+		ID:       "introspection",
+		Requires: []plugin.Type{plugins.ServicePlugin},
+		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
+			i, err := ic.GetByID(plugins.ServicePlugin, services.IntrospectionService)
+			if err != nil {
+				return nil, err
+			}
+
+			localClient, ok := i.(*Local)
+			if !ok {
+				return nil, errors.New("could not create a local client for introspection service")
+			}
+			localClient.UpdateLocal(ic.Properties[plugins.PropertyRootDir])
+
+			return &server{
+				local: localClient,
+			}, nil
+		},
+	})
+}
+
+type server struct {
+	local api.IntrospectionClient
+	api.UnimplementedIntrospectionServer
+}
+
+var _ = (api.IntrospectionServer)(&server{})
+
+func (s *server) Register(server *grpc.Server) error {
+	api.RegisterIntrospectionServer(server, s)
+	return nil
+}
+
+func (s *server) Plugins(ctx context.Context, req *api.PluginsRequest) (*api.PluginsResponse, error) {
+	return s.local.Plugins(ctx, req)
+}
+
+func (s *server) Server(ctx context.Context, empty *ptypes.Empty) (*api.ServerResponse, error) {
+	return s.local.Server(ctx, empty)
+}