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

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/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

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:cdd15cc841013c839eda23818f7da6fe55fa75723d67b05f59d39d7457f16165","contract":["Address_SocketAddress wraps SocketAddress and sets Address oneof","Address.GetSocketAddress returns configured socket address properties","Cluster configures cluster discovery type and load balancing policy"],"goal":"verify 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},"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","verifierAdapter":"golang@1"}

module sample

go 1.24.0

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

require (
	cel.dev/expr v0.24.0 // indirect
	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
	google.golang.org/genproto/googleapis/api v0.0.0-20251029180050-ab9386a59fda // indirect
	google.golang.org/genproto/googleapis/rpc v0.0.0-20251029180050-ab9386a59fda // indirect
)

cel.dev/expr v0.24.0 h1:56OvJKSH3hDGL0ml5uSxZmz3/3Pq4tJ+fb1unVLAFcY=
cel.dev/expr v0.24.0/go.mod h1:hLPLo1W4QUmuYdA72RBX06QTs6MXw941piREPl3Yfiw=
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/genproto/googleapis/api v0.0.0-20251029180050-ab9386a59fda h1:+2XxjfsAu6vqFxwGBRcHiMaDCuZiqXGDUDVWVtrFAnE=
google.golang.org/genproto/googleapis/api v0.0.0-20251029180050-ab9386a59fda/go.mod h1:fDMmzKV90WSg1NbozdqrE64fkuTv6mlq2zxo9ad+3yo=
google.golang.org/genproto/googleapis/rpc v0.0.0-20251029180050-ab9386a59fda h1:i/Q+bfisr7gq6feoJnS/DlpdwEL4ihp41fvRiM3Ork0=
google.golang.org/genproto/googleapis/rpc v0.0.0-20251029180050-ab9386a59fda/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

{
  "schemaVersion": 1,
  "goal": "verify 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"
  ]
}

package main

import (
	"fmt"
	"os"
	"time"

	clusterv3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
	corev3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	"google.golang.org/protobuf/types/known/durationpb"
)

func main() {
	// Assertion 1: Address_SocketAddress wraps SocketAddress and sets Address oneof
	sockAddr := &corev3.SocketAddress{
		Protocol: corev3.SocketAddress_TCP,
		Address:  "127.0.0.1",
		PortSpecifier: &corev3.SocketAddress_PortValue{
			PortValue: 8080,
		},
	}

	addrSocketAddress := &corev3.Address_SocketAddress{
		SocketAddress: sockAddr,
	}

	addr := &corev3.Address{
		Address: addrSocketAddress,
	}

	sockAddrWrapper, ok := addr.GetAddress().(*corev3.Address_SocketAddress)
	if !ok {
		fmt.Fprintf(os.Stderr, "expected *corev3.Address_SocketAddress, got %T\n", addr.GetAddress())
		os.Exit(1)
	}
	if sockAddrWrapper.SocketAddress == nil {
		fmt.Fprintf(os.Stderr, "expected SocketAddress inside Address_SocketAddress to be non-nil\n")
		os.Exit(1)
	}

	// Assertion 2: Address.GetSocketAddress returns configured socket address properties
	retrievedSockAddr := addr.GetSocketAddress()
	if retrievedSockAddr == nil {
		fmt.Fprintf(os.Stderr, "expected non-nil socket address from GetSocketAddress\n")
		os.Exit(1)
	}
	if retrievedSockAddr.GetAddress() != "127.0.0.1" {
		fmt.Fprintf(os.Stderr, "expected address 127.0.0.1, got %s\n", retrievedSockAddr.GetAddress())
		os.Exit(1)
	}
	if retrievedSockAddr.GetPortValue() != 8080 {
		fmt.Fprintf(os.Stderr, "expected port 8080, got %d\n", retrievedSockAddr.GetPortValue())
		os.Exit(1)
	}
	if retrievedSockAddr.GetProtocol() != corev3.SocketAddress_TCP {
		fmt.Fprintf(os.Stderr, "expected TCP protocol, got %v\n", retrievedSockAddr.GetProtocol())
		os.Exit(1)
	}

	// Assertion 3: Cluster configures cluster discovery type and load balancing policy
	cluster := &clusterv3.Cluster{
		Name:                 "test_cluster",
		ConnectTimeout:       durationpb.New(5 * time.Second),
		ClusterDiscoveryType: &clusterv3.Cluster_Type{Type: clusterv3.Cluster_STATIC},
		LbPolicy:             clusterv3.Cluster_ROUND_ROBIN,
	}

	if cluster.GetName() != "test_cluster" {
		fmt.Fprintf(os.Stderr, "expected cluster name test_cluster, got %s\n", cluster.GetName())
		os.Exit(1)
	}
	if cluster.GetType() != clusterv3.Cluster_STATIC {
		fmt.Fprintf(os.Stderr, "expected cluster type STATIC, got %v\n", cluster.GetType())
		os.Exit(1)
	}
	if cluster.GetLbPolicy() != clusterv3.Cluster_ROUND_ROBIN {
		fmt.Fprintf(os.Stderr, "expected ROUND_ROBIN load balancer policy\n")
		os.Exit(1)
	}

	fmt.Println("PASS: envoy v1.37.0 contract passed")
}