github.com/envoyproxy/go-control-plane/envoy v1.32.2: v3.Cluster_DnsLookupFamily_value

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_DnsLookupFamily_value 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_DnsLookupFamily_value

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:sha256:3764cc10ce95c1cfbbd0473b63624842a5cbb6f0586040176145454f37eb0c5b","contract":["Cluster_DnsLookupFamily_value contains exactly 5 entries mapping \"AUTO\"-\u003e0, \"V4_ONLY\"-\u003e1, \"V6_ONLY\"-\u003e2, \"V4_PREFERRED\"-\u003e3, and \"ALL\"-\u003e4","Each entry in Cluster_DnsLookupFamily_value matches its corresponding Cluster_DnsLookupFamily enum constant and round-trips with Cluster_DnsLookupFamily_name","Two-value map lookup on Cluster_DnsLookupFamily_value for an unknown key returns ok=false, and converting a valid entry to Cluster_DnsLookupFamily configures Cluster.DnsLookupFamily"],"goal":"verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DnsLookupFamily_value 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_DnsLookupFamily_value"]},"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_DnsLookupFamily_value"],"verifierAdapter":"golang@1"}

module sample

go 1.22

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=

{
  "schemaVersion": 1,
  "goal": "verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DnsLookupFamily_value 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_DnsLookupFamily_value"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	expected := map[string]int32{
		"AUTO":         int32(clusterv3.Cluster_AUTO),
		"V4_ONLY":      int32(clusterv3.Cluster_V4_ONLY),
		"V6_ONLY":      int32(clusterv3.Cluster_V6_ONLY),
		"V4_PREFERRED": int32(clusterv3.Cluster_V4_PREFERRED),
		"ALL":          int32(clusterv3.Cluster_ALL),
	}

	m := clusterv3.Cluster_DnsLookupFamily_value
	if len(m) != len(expected) {
		fmt.Fprintf(os.Stderr, "expected %d entries in Cluster_DnsLookupFamily_value, got %d\n", len(expected), len(m))
		os.Exit(1)
	}

	for name, wantVal := range expected {
		gotVal, ok := m[name]
		if !ok || gotVal != wantVal {
			fmt.Fprintf(os.Stderr, "Cluster_DnsLookupFamily_value[%q] = (%d, %v), want (%d, true)\n", name, gotVal, ok, wantVal)
			os.Exit(1)
		}
		if clusterv3.Cluster_DnsLookupFamily_name[gotVal] != name {
			fmt.Fprintf(os.Stderr, "round-trip name mismatch for %d: got %q, want %q\n", gotVal, clusterv3.Cluster_DnsLookupFamily_name[gotVal], name)
			os.Exit(1)
		}
	}

	if _, ok := m["UNKNOWN_FAMILY"]; ok {
		fmt.Fprintln(os.Stderr, "expected lookup for UNKNOWN_FAMILY to return ok=false")
		os.Exit(1)
	}

	c := &clusterv3.Cluster{
		DnsLookupFamily: clusterv3.Cluster_DnsLookupFamily(m["V4_PREFERRED"]),
	}
	if c.GetDnsLookupFamily() != clusterv3.Cluster_V4_PREFERRED {
		fmt.Fprintf(os.Stderr, "expected Cluster.GetDnsLookupFamily() to be V4_PREFERRED (3), got %v\n", c.GetDnsLookupFamily())
		os.Exit(1)
	}
}