go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0: NewClientHandler, NewServerHandler

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0
Demonstrate these symbols/APIs:
  - otelgrpc.NewClientHandler
  - otelgrpc.NewServerHandler

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:65464e47a9a129ab139ad2d8463702592a7649b66de020b2d01555a1914401cd","contract":["otelgrpc.NewClientHandler returns a non-nil stats.Handler","otelgrpc.NewServerHandler returns a non-nil stats.Handler","otelgrpc.NewClientHandler accepts configuration options including WithTracerProvider and WithMeterProvider","ClientHandler TagRPC creates and annotates context for client RPC call","ServerHandler TagRPC creates and annotates context for server RPC call"],"goal":"verify pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0"],"schemaVersion":1,"symbols":["otelgrpc.NewClientHandler","otelgrpc.NewServerHandler"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0","symbols":["otelgrpc.NewClientHandler","otelgrpc.NewServerHandler"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0
	go.opentelemetry.io/otel v1.42.0
	go.opentelemetry.io/otel/metric v1.42.0
	go.opentelemetry.io/otel/trace v1.42.0
	google.golang.org/grpc v1.79.2
)

require (
	github.com/cespare/xxhash/v2 v2.3.0 // indirect
	github.com/go-logr/logr v1.4.3 // indirect
	github.com/go-logr/stdr v1.2.2 // indirect
	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
	golang.org/x/net v0.51.0 // indirect
	golang.org/x/sys v0.41.0 // indirect
	golang.org/x/text v0.34.0 // indirect
	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 // indirect
	google.golang.org/protobuf v1.36.11 // indirect
)

github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0 h1:yI1/OhfEPy7J9eoa6Sj051C7n5dvpj0QX8g4sRchg04=
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0/go.mod h1:NoUCKYWK+3ecatC4HjkRktREheMeEtrXoQxrqYFeHSc=
go.opentelemetry.io/otel v1.42.0 h1:lSQGzTgVR3+sgJDAU/7/ZMjN9Z+vUip7leaqBKy4sho=
go.opentelemetry.io/otel v1.42.0/go.mod h1:lJNsdRMxCUIWuMlVJWzecSMuNjE7dOYyWlqOXWkdqCc=
go.opentelemetry.io/otel/metric v1.42.0 h1:2jXG+3oZLNXEPfNmnpxKDeZsFI5o4J+nz6xUlaFdF/4=
go.opentelemetry.io/otel/metric v1.42.0/go.mod h1:RlUN/7vTU7Ao/diDkEpQpnz3/92J9ko05BIwxYa2SSI=
go.opentelemetry.io/otel/sdk v1.42.0 h1:LyC8+jqk6UJwdrI/8VydAq/hvkFKNHZVIWuslJXYsDo=
go.opentelemetry.io/otel/sdk v1.42.0/go.mod h1:rGHCAxd9DAph0joO4W6OPwxjNTYWghRWmkHuGbayMts=
go.opentelemetry.io/otel/sdk/metric v1.42.0 h1:D/1QR46Clz6ajyZ3G8SgNlTJKBdGp84q9RKCAZ3YGuA=
go.opentelemetry.io/otel/sdk/metric v1.42.0/go.mod h1:Ua6AAlDKdZ7tdvaQKfSmnFTdHx37+J4ba8MwVCYM5hc=
go.opentelemetry.io/otel/trace v1.42.0 h1:OUCgIPt+mzOnaUTpOQcBiM/PLQ/Op7oq6g4LenLmOYY=
go.opentelemetry.io/otel/trace v1.42.0/go.mod h1:f3K9S+IFqnumBkKhRJMeaZeNk9epyhnCmQh/EysQCdc=
golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 h1:ggcbiqK8WWh6l1dnltU4BgWGIGo+EVYxCaAPih/zQXQ=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
google.golang.org/grpc v1.79.2 h1:fRMD94s2tITpyJGtBBn7MkMseNpOZU8ZxgC3MMBaXRU=
google.golang.org/grpc v1.79.2/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package sample

import (
	"context"
	"fmt"

	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
	"google.golang.org/grpc/stats"
)

// ClientHandlerWrapper wraps an OpenTelemetry instrumented client stats.Handler.
type ClientHandlerWrapper struct {
	Handler stats.Handler
}

// ServerHandlerWrapper wraps an OpenTelemetry instrumented server stats.Handler.
type ServerHandlerWrapper struct {
	Handler stats.Handler
}

// NewClientHandlerWrapper creates a new ClientHandlerWrapper with the provided options.
func NewClientHandlerWrapper(opts ...otelgrpc.Option) (*ClientHandlerWrapper, error) {
	h := otelgrpc.NewClientHandler(opts...)
	if h == nil {
		return nil, fmt.Errorf("failed to create client handler")
	}
	return &ClientHandlerWrapper{
		Handler: h,
	}, nil
}

// NewServerHandlerWrapper creates a new ServerHandlerWrapper with the provided options.
func NewServerHandlerWrapper(opts ...otelgrpc.Option) (*ServerHandlerWrapper, error) {
	h := otelgrpc.NewServerHandler(opts...)
	if h == nil {
		return nil, fmt.Errorf("failed to create server handler")
	}
	return &ServerHandlerWrapper{
		Handler: h,
	}, nil
}

// TagRPC tags an RPC request using the underlying client stats.Handler.
func (c *ClientHandlerWrapper) TagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
	if c == nil || c.Handler == nil {
		return ctx
	}
	return c.Handler.TagRPC(ctx, info)
}

// TagRPC tags an RPC request using the underlying server stats.Handler.
func (s *ServerHandlerWrapper) TagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
	if s == nil || s.Handler == nil {
		return ctx
	}
	return s.Handler.TagRPC(ctx, info)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc@v0.67.0"
  ],
  "symbols": [
    "otelgrpc.NewClientHandler",
    "otelgrpc.NewServerHandler"
  ]
}

package main

import (
	"context"
	"fmt"
	"os"

	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
	"go.opentelemetry.io/otel/metric/noop"
	"go.opentelemetry.io/otel/propagation"
	traceNoop "go.opentelemetry.io/otel/trace/noop"
	"google.golang.org/grpc/stats"

	"sample"
)

func main() {
	if err := runTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All otelgrpc contract tests passed successfully.")
}

func runTests() error {
	ctx := context.Background()

	// 1. otelgrpc.NewClientHandler returns a non-nil stats.Handler
	clientHandler := otelgrpc.NewClientHandler()
	if clientHandler == nil {
		return fmt.Errorf("expected non-nil stats.Handler from otelgrpc.NewClientHandler")
	}

	// 2. otelgrpc.NewServerHandler returns a non-nil stats.Handler
	serverHandler := otelgrpc.NewServerHandler()
	if serverHandler == nil {
		return fmt.Errorf("expected non-nil stats.Handler from otelgrpc.NewServerHandler")
	}

	// 3. otelgrpc.NewClientHandler accepts configuration options including WithTracerProvider and WithMeterProvider
	configuredClientHandler := otelgrpc.NewClientHandler(
		otelgrpc.WithTracerProvider(traceNoop.NewTracerProvider()),
		otelgrpc.WithMeterProvider(noop.NewMeterProvider()),
		otelgrpc.WithPropagators(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{})),
	)
	if configuredClientHandler == nil {
		return fmt.Errorf("expected non-nil stats.Handler from configured otelgrpc.NewClientHandler")
	}

	// 4. ClientHandler TagRPC creates and annotates context for client RPC call
	clientWrapper, err := sample.NewClientHandlerWrapper()
	if err != nil {
		return fmt.Errorf("failed to create ClientHandlerWrapper: %w", err)
	}
	tagInfo := &stats.RPCTagInfo{
		FullMethodName: "/test.Service/TestMethod",
	}
	clientCtx := clientWrapper.TagRPC(ctx, tagInfo)
	if clientCtx == nil {
		return fmt.Errorf("expected non-nil context from ClientHandlerWrapper.TagRPC")
	}

	// 5. ServerHandler TagRPC creates and annotates context for server RPC call
	serverWrapper, err := sample.NewServerHandlerWrapper()
	if err != nil {
		return fmt.Errorf("failed to create ServerHandlerWrapper: %w", err)
	}
	serverCtx := serverWrapper.TagRPC(ctx, tagInfo)
	if serverCtx == nil {
		return fmt.Errorf("expected non-nil context from ServerHandlerWrapper.TagRPC")
	}

	return nil
}