github.com/envoyproxy/go-control-plane/envoy v1.36.0: v3.Cluster_STRICT_DNS

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/cluster/v3.Cluster_STRICT_DNS in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0
Demonstrate these symbols/APIs:
  - github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_STRICT_DNS

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:sha256:514fa875b3cffd10fba20851346912ada09377169b4f6eadf0133f5ec45620a5","contract":["Cluster_STRICT_DNS has defined enum value 1 of type Cluster_DiscoveryType","Cluster_STRICT_DNS name and value mappings match between Cluster_DiscoveryType_name and Cluster_DiscoveryType_value","Cluster initializes with Cluster_STRICT_DNS discovery type via Cluster_Type wrapper","Cluster GetType returns Cluster_STRICT_DNS when discovery type is configured","Cluster GetClusterDiscoveryType returns non-nil *Cluster_Type containing Cluster_STRICT_DNS"],"goal":"verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_STRICT_DNS in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0","kind":"HOW","packages":["pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0"],"schemaVersion":1,"symbols":["github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_STRICT_DNS"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0","symbols":["github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_STRICT_DNS"],"verifierAdapter":"golang@1"}

module sample

go 1.23.0

require github.com/envoyproxy/go-control-plane/envoy v1.36.0

require (
	github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443 // indirect
	github.com/envoyproxy/protoc-gen-validate v1.2.1 // indirect
	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
	google.golang.org/protobuf v1.36.10 // indirect
)

github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443 h1:aQ3y1lwWyqYPiWZThqv1aFbZMiM9vblcSArJRf2Irls=
github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
github.com/envoyproxy/go-control-plane/envoy v1.36.0 h1:yg/JjO5E7ubRyKX3m07GF3reDNEnfOboJ0QySbH736g=
github.com/envoyproxy/go-control-plane/envoy v1.36.0/go.mod h1:ty89S1YCCVruQAm9OtKeEkQLTb+Lkz0k8v9W0Oxsv98=
github.com/envoyproxy/protoc-gen-validate v1.2.1 h1:DEo3O99U8j4hBFwbJfrz9VtgcDfUKS7KJ7spH3d86P8=
github.com/envoyproxy/protoc-gen-validate v1.2.1/go.mod h1:d/C80l/jxXLdfEIhX1W2TmLfsJ31lvEjwamM4DxlWXU=
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 v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

package main

import (
	"fmt"

	clusterv3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
)

func main() {
	discoveryType := clusterv3.Cluster_STRICT_DNS
	fmt.Printf("Cluster discovery type: %s (%d)\n", discoveryType.String(), discoveryType)

	cluster := &clusterv3.Cluster{
		Name: "strict_dns_service",
		ClusterDiscoveryType: &clusterv3.Cluster_Type{
			Type: clusterv3.Cluster_STRICT_DNS,
		},
		DnsLookupFamily: clusterv3.Cluster_V4_ONLY,
	}

	fmt.Printf("Configured cluster %s with discovery type: %s\n", cluster.GetName(), cluster.GetType().String())
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_STRICT_DNS in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.36.0"
  ],
  "symbols": [
    "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_STRICT_DNS"
  ]
}

package main

import (
	"fmt"
	"os"

	clusterv3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
)

func main() {
	if err := runContract(); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("PASS: all contract assertions satisfied")
}

func runContract() error {
	// 1. Cluster_STRICT_DNS has defined enum value 1 of type Cluster_DiscoveryType
	var dt clusterv3.Cluster_DiscoveryType = clusterv3.Cluster_STRICT_DNS
	if dt != 1 {
		return fmt.Errorf("expected Cluster_STRICT_DNS to equal 1, got %d", dt)
	}

	// 2. Cluster_STRICT_DNS name and value mappings match between Cluster_DiscoveryType_name and Cluster_DiscoveryType_value
	name, ok := clusterv3.Cluster_DiscoveryType_name[int32(clusterv3.Cluster_STRICT_DNS)]
	if !ok || name != "STRICT_DNS" {
		return fmt.Errorf("expected Cluster_DiscoveryType_name[1] to be 'STRICT_DNS', got %q", name)
	}
	val, ok := clusterv3.Cluster_DiscoveryType_value["STRICT_DNS"]
	if !ok || val != int32(clusterv3.Cluster_STRICT_DNS) {
		return fmt.Errorf("expected Cluster_DiscoveryType_value['STRICT_DNS'] to be 1, got %d", val)
	}
	if clusterv3.Cluster_STRICT_DNS.String() != "STRICT_DNS" {
		return fmt.Errorf("expected String() to be 'STRICT_DNS', got %q", clusterv3.Cluster_STRICT_DNS.String())
	}

	// 3. Cluster initializes with Cluster_STRICT_DNS discovery type via Cluster_Type wrapper
	cluster := &clusterv3.Cluster{
		Name: "test_cluster",
		ClusterDiscoveryType: &clusterv3.Cluster_Type{
			Type: clusterv3.Cluster_STRICT_DNS,
		},
	}
	if cluster.GetName() != "test_cluster" {
		return fmt.Errorf("expected cluster name 'test_cluster', got %q", cluster.GetName())
	}

	// 4. Cluster GetType returns Cluster_STRICT_DNS when discovery type is configured
	if cluster.GetType() != clusterv3.Cluster_STRICT_DNS {
		return fmt.Errorf("expected GetType() to return Cluster_STRICT_DNS, got %v", cluster.GetType())
	}

	// 5. Cluster GetClusterDiscoveryType returns non-nil *Cluster_Type containing Cluster_STRICT_DNS
	discType := cluster.GetClusterDiscoveryType()
	typeWrapper, ok := discType.(*clusterv3.Cluster_Type)
	if !ok || typeWrapper == nil {
		return fmt.Errorf("expected *clusterv3.Cluster_Type wrapper, got %T", discType)
	}
	if typeWrapper.Type != clusterv3.Cluster_STRICT_DNS {
		return fmt.Errorf("expected wrapper type to be Cluster_STRICT_DNS, got %v", typeWrapper.Type)
	}

	return nil
}