github.com/envoyproxy/go-control-plane/envoy v1.32.2: v3.Cluster_LOGICAL_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_LOGICAL_DNS in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.32.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.32.2
Demonstrate these symbols/APIs:
  - github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_LOGICAL_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:e6573d93b0b3bbbabc15e3284cc5367bfdc82aa47e55865610bfa8edc1c94934","contract":["Cluster_LOGICAL_DNS has defined enum value 2 of type Cluster_DiscoveryType","Cluster_LOGICAL_DNS name and value mappings match between Cluster_DiscoveryType_name and Cluster_DiscoveryType_value","Cluster initializes with Cluster_LOGICAL_DNS discovery type via Cluster_Type wrapper","Cluster GetType returns Cluster_LOGICAL_DNS when discovery type is configured","Cluster GetClusterDiscoveryType returns non-nil *Cluster_Type containing Cluster_LOGICAL_DNS"],"goal":"verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_LOGICAL_DNS in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.32.2","kind":"HOW","packages":["pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.32.2"],"schemaVersion":1,"symbols":["github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_LOGICAL_DNS"]},"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@v1.32.2"],"schemaVersion":1,"subject":"pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.32.2","symbols":["github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_LOGICAL_DNS"],"verifierAdapter":"golang@1"}

module sample

go 1.23.0

require github.com/envoyproxy/go-control-plane/envoy v1.32.2

require (
	github.com/cncf/xds/go v0.0.0-20240723142845-024c85f92f20 // indirect
	github.com/envoyproxy/protoc-gen-validate v1.1.0 // indirect
	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
	google.golang.org/protobuf v1.35.2 // indirect
)

github.com/cncf/xds/go v0.0.0-20240723142845-024c85f92f20 h1:N+3sFI5GUjRKBi+i0TxYVST9h4Ie192jJWpHvthBBgg=
github.com/cncf/xds/go v0.0.0-20240723142845-024c85f92f20/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
github.com/envoyproxy/go-control-plane/envoy v1.32.2 h1:zidqwmijfcbyKqVxjQDFx042PgX+p9U+/fu/f9VtSk8=
github.com/envoyproxy/go-control-plane/envoy v1.32.2/go.mod h1:eR2SOX2IedqlPvmiKjUH7Wu//S602JKI7HPC/L3SRq8=
github.com/envoyproxy/protoc-gen-validate v1.1.0 h1:tntQDh69XqOCOZsDz0lVJQez/2L6Uu2PdjCQwWCJ3bM=
github.com/envoyproxy/protoc-gen-validate v1.1.0/go.mod h1:sXRDRVmzEbkM7CVcM06s9shE/m23dg3wzjl0UWqJ2q4=
github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=

package main

import (
	"fmt"

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

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

	cluster := &clusterv3.Cluster{
		Name: "logical_dns_service",
		ClusterDiscoveryType: &clusterv3.Cluster_Type{
			Type: clusterv3.Cluster_LOGICAL_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_LOGICAL_DNS in pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.32.2",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/envoyproxy/go-control-plane/envoy@v1.32.2"
  ],
  "symbols": [
    "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_LOGICAL_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_LOGICAL_DNS has defined enum value 2 of type Cluster_DiscoveryType
	var dt clusterv3.Cluster_DiscoveryType = clusterv3.Cluster_LOGICAL_DNS
	if dt != 2 {
		return fmt.Errorf("expected Cluster_LOGICAL_DNS to equal 2, got %d", dt)
	}

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

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

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

	// 5. Cluster GetClusterDiscoveryType returns non-nil *Cluster_Type containing Cluster_LOGICAL_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_LOGICAL_DNS {
		return fmt.Errorf("expected wrapper type to be Cluster_LOGICAL_DNS, got %v", typeWrapper.Type)
	}

	return nil
}