github.com/envoyproxy/go-control-plane/envoy v1.37.0: v3.ApiVersion_V3

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 github.com/envoyproxy/go-control-plane/envoy/config/core/v3.ApiVersion_V3 in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0
Demonstrate these symbols/APIs:
  - github.com/envoyproxy/go-control-plane/envoy/config/core/v3.ApiVersion_V3

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:sha256:68eea0565d0faff749032e6d2a75bae20d0539fd3f312a3f7a920b5fa0e2d32b","contract":["ApiVersion_V3 represents the Envoy xDS v3 API version constant with integer value 2.","ApiVersion_V3 String() method returns 'V3'.","ApiConfigSource accepts ApiVersion_V3 as its TransportApiVersion for gRPC xDS transport.","ConfigSource accepts ApiVersion_V3 as its ResourceApiVersion for xDS resources.","ConfigSource configured with ApiVersion_V3 passes protoc-gen-validate ValidateAll verification."],"goal":"verify github.com/envoyproxy/go-control-plane/envoy/config/core/v3.ApiVersion_V3 in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0","kind":"HOW","packages":["pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0"],"schemaVersion":1,"symbols":["github.com/envoyproxy/go-control-plane/envoy/config/core/v3.ApiVersion_V3"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0","symbols":["github.com/envoyproxy/go-control-plane/envoy/config/core/v3.ApiVersion_V3"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	github.com/envoyproxy/go-control-plane/envoy v1.37.0
	google.golang.org/protobuf v1.36.11
)

require (
	github.com/cncf/xds/go v0.0.0-20251110193048-8bfbf64dc13e // indirect
	github.com/envoyproxy/protoc-gen-validate v1.3.0 // indirect
	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
)

github.com/cncf/xds/go v0.0.0-20251110193048-8bfbf64dc13e h1:gt7U1Igw0xbJdyaCM5H2CnlAlPSkzrhsebQB6WQWjLA=
github.com/cncf/xds/go v0.0.0-20251110193048-8bfbf64dc13e/go.mod h1:KdCmV+x/BuvyMxRnYBlmVaq4OLiKW6iRQfvC62cvdkI=
github.com/envoyproxy/go-control-plane/envoy v1.37.0 h1:u3riX6BoYRfF4Dr7dwSOroNfdSbEPe9Yyl09/B6wBrQ=
github.com/envoyproxy/go-control-plane/envoy v1.37.0/go.mod h1:DReE9MMrmecPy+YvQOAOHNYMALuowAnbjjEMkkWOi6A=
github.com/envoyproxy/protoc-gen-validate v1.3.0 h1:TvGH1wof4H33rezVKWSpqKz5NXWg5VPuZ0uONDT6eb4=
github.com/envoyproxy/protoc-gen-validate v1.3.0/go.mod h1:HvYl7zwPa5mffgyeTUHA9zHIH36nmrm7oCbo4YKoSWA=
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/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 h1:GFCKgmp0tecUJ0sJuv4pzYCqS9+RGSn52M3FUwPs+uo=
github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10/go.mod h1:t/avpk3KcrXxUnYOhZhMXJlSEyie6gQbtLq5NM3loB8=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

package main

import (
	"fmt"
	"time"

	corev3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	"google.golang.org/protobuf/types/known/durationpb"
)

func main() {
	// Demonstrate ApiVersion_V3 constant
	fmt.Printf("ApiVersion_V3 name: %s, enum number: %d\n", corev3.ApiVersion_V3.String(), corev3.ApiVersion_V3)

	// Configure an xDS ApiConfigSource using ApiVersion_V3 transport
	apiConfigSource := &corev3.ApiConfigSource{
		ApiType:             corev3.ApiConfigSource_GRPC,
		TransportApiVersion: corev3.ApiVersion_V3,
		GrpcServices: []*corev3.GrpcService{
			{
				TargetSpecifier: &corev3.GrpcService_EnvoyGrpc_{
					EnvoyGrpc: &corev3.GrpcService_EnvoyGrpc{
						ClusterName: "xds_cluster",
					},
				},
			},
		},
		RefreshDelay:   durationpb.New(10 * time.Second),
		RequestTimeout: durationpb.New(5 * time.Second),
	}

	// Configure a ConfigSource using ApiVersion_V3 resource API version
	configSource := &corev3.ConfigSource{
		ConfigSourceSpecifier: &corev3.ConfigSource_ApiConfigSource{
			ApiConfigSource: apiConfigSource,
		},
		ResourceApiVersion:  corev3.ApiVersion_V3,
		InitialFetchTimeout: durationpb.New(15 * time.Second),
	}

	fmt.Printf("ConfigSource configured: ResourceApiVersion=%s, TransportApiVersion=%s\n",
		configSource.GetResourceApiVersion().String(),
		configSource.GetApiConfigSource().GetTransportApiVersion().String())
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/envoyproxy/go-control-plane/envoy/config/core/v3.ApiVersion_V3 in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.37.0"
  ],
  "symbols": [
    "github.com/envoyproxy/go-control-plane/envoy/config/core/v3.ApiVersion_V3"
  ]
}

package main

import (
	"fmt"
	"os"
	"time"

	corev3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	"google.golang.org/protobuf/types/known/durationpb"
)

func main() {
	// Assertion 1: ApiVersion_V3 represents the Envoy xDS v3 API version constant with integer value 2.
	if corev3.ApiVersion_V3 != 2 {
		fmt.Fprintf(os.Stderr, "FAIL: expected ApiVersion_V3 to equal 2, got %d\n", corev3.ApiVersion_V3)
		os.Exit(1)
	}

	// Assertion 2: ApiVersion_V3 String() method returns 'V3'.
	if corev3.ApiVersion_V3.String() != "V3" {
		fmt.Fprintf(os.Stderr, "FAIL: expected ApiVersion_V3 String() to be 'V3', got '%s'\n", corev3.ApiVersion_V3.String())
		os.Exit(1)
	}

	// Assertion 3: ApiConfigSource accepts ApiVersion_V3 as its TransportApiVersion for gRPC xDS transport.
	apiConfigSource := &corev3.ApiConfigSource{
		ApiType:             corev3.ApiConfigSource_GRPC,
		TransportApiVersion: corev3.ApiVersion_V3,
		GrpcServices: []*corev3.GrpcService{
			{
				TargetSpecifier: &corev3.GrpcService_EnvoyGrpc_{
					EnvoyGrpc: &corev3.GrpcService_EnvoyGrpc{
						ClusterName: "xds_cluster",
					},
				},
			},
		},
		RefreshDelay:   durationpb.New(10 * time.Second),
		RequestTimeout: durationpb.New(5 * time.Second),
	}

	if apiConfigSource.GetTransportApiVersion() != corev3.ApiVersion_V3 {
		fmt.Fprintf(os.Stderr, "FAIL: expected TransportApiVersion %v, got %v\n", corev3.ApiVersion_V3, apiConfigSource.GetTransportApiVersion())
		os.Exit(1)
	}

	// Assertion 4: ConfigSource accepts ApiVersion_V3 as its ResourceApiVersion for xDS resources.
	configSource := &corev3.ConfigSource{
		ConfigSourceSpecifier: &corev3.ConfigSource_ApiConfigSource{
			ApiConfigSource: apiConfigSource,
		},
		ResourceApiVersion:  corev3.ApiVersion_V3,
		InitialFetchTimeout: durationpb.New(15 * time.Second),
	}

	if configSource.GetResourceApiVersion() != corev3.ApiVersion_V3 {
		fmt.Fprintf(os.Stderr, "FAIL: expected ResourceApiVersion %v, got %v\n", corev3.ApiVersion_V3, configSource.GetResourceApiVersion())
		os.Exit(1)
	}

	// Assertion 5: ConfigSource configured with ApiVersion_V3 passes protoc-gen-validate ValidateAll verification.
	if err := configSource.ValidateAll(); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: ValidateAll failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("PASS: all ApiVersion_V3 contract assertions passed.")
}