shim: Move ttrpc interceptors to plugins

This makes it so we don't need to import otelttrpc unless the shim is
compiled with the `shim_tracing` build tag.
This way otel is no longer compiled into the binary at all unless
`shim_tracing` is set.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

integration/failpoint/cmd/containerd-shim-runc-fp-v1/plugin_linux.go

@@ -74,7 +74,7 @@ func init() {
 }
 
 var (
-	_ = shim.TTRPCServerOptioner(&taskServiceWithFp{})
+	_ = shim.TTRPCServerUnaryOptioner(&taskServiceWithFp{})
 )
 
 type taskServiceWithFp struct {
@@ -87,7 +87,7 @@ func (s *taskServiceWithFp) RegisterTTRPC(server *ttrpc.Server) error {
 	return nil
 }
 
-func (s *taskServiceWithFp) UnaryInterceptor() ttrpc.UnaryServerInterceptor {
+func (s *taskServiceWithFp) UnaryServerInterceptor() ttrpc.UnaryServerInterceptor {
 	return func(ctx context.Context, unmarshal ttrpc.Unmarshaler, info *ttrpc.UnaryServerInfo, method ttrpc.Method) (interface{}, error) {
 		methodName := filepath.Base(info.FullMethod)
 		if fp, ok := s.fps[methodName]; ok {

pkg/shim/shim.go

@@ -43,7 +43,6 @@ import (
 	"github.com/containerd/containerd/v2/plugins"
 	"github.com/containerd/containerd/v2/version"
 	"github.com/containerd/log"
-	"github.com/containerd/otelttrpc"
 	"github.com/containerd/plugin"
 	"github.com/containerd/plugin/registry"
 	"github.com/containerd/ttrpc"
@@ -112,10 +111,12 @@ type TTRPCService interface {
 	RegisterTTRPC(*ttrpc.Server) error
 }
 
-type TTRPCServerOptioner interface {
-	TTRPCService
+type TTRPCServerUnaryOptioner interface {
+	UnaryServerInterceptor() ttrpc.UnaryServerInterceptor
+}
 
-	UnaryInterceptor() ttrpc.UnaryServerInterceptor
+type TTRPCClientUnaryOptioner interface {
+	UnaryClientInterceptor() ttrpc.UnaryClientInterceptor
 }
 
 var (
@@ -249,13 +250,6 @@ func run(ctx context.Context, manager Manager, config Config) error {
 	}
 
 	ttrpcAddress := os.Getenv(ttrpcAddressEnv)
-	publisher, err := NewPublisher(ttrpcAddress, WithPublishTTRPCOpts(
-		ttrpc.WithUnaryClientInterceptor(otelttrpc.UnaryClientInterceptor()),
-	))
-	if err != nil {
-		return err
-	}
-	defer publisher.Close()
 
 	ctx = namespaces.WithNamespace(ctx, namespaceFlag)
 	ctx = context.WithValue(ctx, OptsKey{}, Opts{BundlePath: bundlePath, Debug: debugFlag})
@@ -333,7 +327,15 @@ func run(ctx context.Context, manager Manager, config Config) error {
 		Type: plugins.EventPlugin,
 		ID:   "publisher",
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
-			return publisher, nil
+			return NewPublisher(ttrpcAddress, func(cfg *publisherConfig) {
+				p, _ := ic.GetByID(plugins.TTRPCPlugin, "otelttrpc")
+				if p == nil {
+					return
+				}
+
+				opts := ttrpc.WithUnaryClientInterceptor(p.(TTRPCClientUnaryOptioner).UnaryClientInterceptor())
+				WithPublishTTRPCOpts(opts)(cfg)
+			})
 		},
 	})
 
@@ -389,11 +391,12 @@ func run(ctx context.Context, manager Manager, config Config) error {
 		if src, ok := instance.(TTRPCService); ok {
 			log.G(ctx).WithField("id", pID).Debug("registering ttrpc service")
 			ttrpcServices = append(ttrpcServices, src)
-
 		}
 
-		if src, ok := instance.(TTRPCServerOptioner); ok {
-			ttrpcUnaryInterceptors = append(ttrpcUnaryInterceptors, src.UnaryInterceptor())
+		if src, ok := instance.(TTRPCServerUnaryOptioner); ok {
+			ttrpcUnaryInterceptors = append(ttrpcUnaryInterceptors, src.UnaryServerInterceptor())
+		}
+
 		}
 	}
 
@@ -401,8 +404,6 @@ func run(ctx context.Context, manager Manager, config Config) error {
 		return fmt.Errorf("required that ttrpc service")
 	}
 
-	ttrpcUnaryInterceptors = append(ttrpcUnaryInterceptors, otelttrpc.UnaryServerInterceptor())
-
 	unaryInterceptor := chainUnaryServerInterceptors(ttrpcUnaryInterceptors...)
 	server, err := newServer(ttrpc.WithUnaryServerInterceptor(unaryInterceptor))
 	if err != nil {

pkg/tracing/plugin/ttrpc.go

@@ -0,0 +1,47 @@
+/*
+   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 plugin
+
+import (
+	"github.com/containerd/containerd/v2/plugins"
+	"github.com/containerd/otelttrpc"
+	"github.com/containerd/plugin"
+	"github.com/containerd/plugin/registry"
+	"github.com/containerd/ttrpc"
+)
+
+func init() {
+	const pluginName = "otelttrpc"
+
+	registry.Register(&plugin.Registration{
+		ID:   pluginName,
+		Type: plugins.TTRPCPlugin,
+		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
+			return otelttrpcopts{}, nil
+		},
+	})
+}
+
+type otelttrpcopts struct{}
+
+func (otelttrpcopts) UnaryServerInterceptor() ttrpc.UnaryServerInterceptor {
+	return otelttrpc.UnaryServerInterceptor()
+}
+
+func (otelttrpcopts) UnaryClientInterceptor() ttrpc.UnaryClientInterceptor {
+	return otelttrpc.UnaryClientInterceptor()
+}