github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2

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/github.com/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2

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:sha256:3258319c0e83731b9c12a038846d1974b9af42e5f166efa1819d30550a37e80a","contract":["ResourceLocator v3 initializes with XDSTP scheme, resource name, authority, and exact context params and validates successfully","ResourceName v3 initializes with id, authority, and context parameters and validates successfully","CidrRange v3 initializes with address prefix and prefix length and validates successfully","TypedExtensionConfig v3 initializes with name and typed config and validates successfully"],"goal":"verify pkg:golang/github.com/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2","kind":"HOW","packages":["pkg:golang/github.com/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2"],"schemaVersion":1},"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/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2"],"schemaVersion":1,"subject":"pkg:golang/github.com/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2","verifierAdapter":"golang@1"}

module sample

go 1.24.6

require (
	github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2
	google.golang.org/protobuf v1.36.10
)

require github.com/envoyproxy/protoc-gen-validate v1.3.0 // indirect

github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2 h1:aBangftG7EVZoUb69Os8IaYg++6uMOdKK83QtkkvJik=
github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2/go.mod h1:qwXFYgsP6T7XnJtbKlf1HP8AjxZZyzxMmc+Lq5GjlU4=
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=
google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/cncf/xds/go@v0.0.0-20260202195803-dba9d589def2"
  ]
}

package main

import (
	"fmt"
	"os"

	corev3 "github.com/cncf/xds/go/xds/core/v3"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
	"google.golang.org/protobuf/types/known/wrapperspb"
)

func main() {
	// Assertion 1: ResourceLocator v3 initializes with XDSTP scheme, resource name, authority, and exact context params and validates successfully
	{
		locator := &corev3.ResourceLocator{
			Scheme:       corev3.ResourceLocator_XDSTP,
			Id:           "service-cluster-1",
			Authority:    "example.com",
			ResourceType: "envoy.config.cluster.v3.Cluster",
			ContextParamSpecifier: &corev3.ResourceLocator_ExactContext{
				ExactContext: &corev3.ContextParams{
					Params: map[string]string{
						"stage": "staging",
					},
				},
			},
		}

		if locator.GetScheme() != corev3.ResourceLocator_XDSTP {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: scheme mismatch\n")
			os.Exit(1)
		}
		if locator.GetId() != "service-cluster-1" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: id mismatch\n")
			os.Exit(1)
		}
		if locator.GetAuthority() != "example.com" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: authority mismatch\n")
			os.Exit(1)
		}
		if locator.GetResourceType() != "envoy.config.cluster.v3.Cluster" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: resource type mismatch\n")
			os.Exit(1)
		}
		exactCtx := locator.GetExactContext()
		if exactCtx == nil || exactCtx.GetParams()["stage"] != "staging" {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: exact context params mismatch\n")
			os.Exit(1)
		}
		if err := locator.Validate(); err != nil {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: validation error: %v\n", err)
			os.Exit(1)
		}
	}

	// Assertion 2: ResourceName v3 initializes with id, authority, and context parameters and validates successfully
	{
		resName := &corev3.ResourceName{
			Id:           "listener-1",
			Authority:    "example.com",
			ResourceType: "envoy.config.listener.v3.Listener",
			Context: &corev3.ContextParams{
				Params: map[string]string{
					"region": "us-west",
				},
			},
		}

		if resName.GetId() != "listener-1" {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: id mismatch\n")
			os.Exit(1)
		}
		if resName.GetAuthority() != "example.com" {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: authority mismatch\n")
			os.Exit(1)
		}
		if resName.GetContext() == nil || resName.GetContext().GetParams()["region"] != "us-west" {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: context params mismatch\n")
			os.Exit(1)
		}
		if err := resName.Validate(); err != nil {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: validation error: %v\n", err)
			os.Exit(1)
		}
	}

	// Assertion 3: CidrRange v3 initializes with address prefix and prefix length and validates successfully
	{
		cidr := &corev3.CidrRange{
			AddressPrefix: "192.168.1.0",
			PrefixLen: &wrapperspb.UInt32Value{
				Value: 24,
			},
		}

		if cidr.GetAddressPrefix() != "192.168.1.0" {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: address prefix mismatch\n")
			os.Exit(1)
		}
		if cidr.GetPrefixLen().GetValue() != 24 {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: prefix len mismatch\n")
			os.Exit(1)
		}
		if err := cidr.Validate(); err != nil {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: validation error: %v\n", err)
			os.Exit(1)
		}
	}

	// Assertion 4: TypedExtensionConfig v3 initializes with name and typed config and validates successfully
	{
		innerMsg := &wrapperspb.StringValue{Value: "custom-config"}
		anyMsg, err := anypb.New(innerMsg)
		if err != nil {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: anypb.New: %v\n", err)
			os.Exit(1)
		}

		extConfig := &corev3.TypedExtensionConfig{
			Name:        "custom.extension",
			TypedConfig: anyMsg,
		}

		if extConfig.GetName() != "custom.extension" {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: name mismatch\n")
			os.Exit(1)
		}
		if !proto.Equal(extConfig.GetTypedConfig(), anyMsg) {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: typed config mismatch\n")
			os.Exit(1)
		}
		if err := extConfig.Validate(); err != nil {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: validation error: %v\n", err)
			os.Exit(1)
		}
	}

	fmt.Println("PASS: xds/go verification successful")
}