github.com/envoyproxy/go-control-plane/envoy v1.37.0: v3.Cluster_DiscoveryType_name

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_DiscoveryType_name in 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
Demonstrate these symbols/APIs:
  - github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DiscoveryType_name

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:sha256:38db5c9bdb2d81751557697c54432cba4b6e2b956d108777ab0181be80f64a02","contract":["Cluster_DiscoveryType_name is a non-nil map containing discovery type enum names","Cluster_DiscoveryType_name maps Cluster_STATIC to \"STATIC\"","Cluster_DiscoveryType_name maps Cluster_STRICT_DNS to \"STRICT_DNS\" and Cluster_LOGICAL_DNS to \"LOGICAL_DNS\"","Cluster_DiscoveryType_name maps Cluster_EDS to \"EDS\" and Cluster_ORIGINAL_DST to \"ORIGINAL_DST\"","Cluster_DiscoveryType_name does not contain unmapped discovery type keys"],"goal":"verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DiscoveryType_name in 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,"symbols":["github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DiscoveryType_name"]},"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","symbols":["github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DiscoveryType_name"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

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

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
	google.golang.org/protobuf v1.36.11 // 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=

package main

import (
	"fmt"

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

// LookupDiscoveryTypeName returns the string name for a given discovery type enum value.
func LookupDiscoveryTypeName(discType clusterv3.Cluster_DiscoveryType) (string, bool) {
	name, exists := clusterv3.Cluster_DiscoveryType_name[int32(discType)]
	return name, exists
}

func main() {
	for val, name := range clusterv3.Cluster_DiscoveryType_name {
		fmt.Printf("Cluster discovery type %d: %s\n", val, name)
	}
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DiscoveryType_name in 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"
  ],
  "symbols": [
    "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_DiscoveryType_name"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: Cluster_DiscoveryType_name is a non-nil map containing discovery type enum names
	if clusterv3.Cluster_DiscoveryType_name == nil {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: Cluster_DiscoveryType_name is nil\n")
		os.Exit(1)
	}
	if len(clusterv3.Cluster_DiscoveryType_name) != 5 {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected 5 entries in Cluster_DiscoveryType_name, got %d\n", len(clusterv3.Cluster_DiscoveryType_name))
		for k, v := range clusterv3.Cluster_DiscoveryType_name {
			fmt.Fprintf(os.Stderr, "  %d -> %s\n", k, v)
		}
		os.Exit(1)
	}

	// Assertion 2: Cluster_DiscoveryType_name maps Cluster_STATIC to "STATIC"
	if name, ok := clusterv3.Cluster_DiscoveryType_name[int32(clusterv3.Cluster_STATIC)]; !ok || name != "STATIC" {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected STATIC, got %q (ok=%v)\n", name, ok)
		os.Exit(1)
	}

	// Assertion 3: Cluster_DiscoveryType_name maps Cluster_STRICT_DNS to "STRICT_DNS" and Cluster_LOGICAL_DNS to "LOGICAL_DNS"
	if name, ok := clusterv3.Cluster_DiscoveryType_name[int32(clusterv3.Cluster_STRICT_DNS)]; !ok || name != "STRICT_DNS" {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected STRICT_DNS, got %q (ok=%v)\n", name, ok)
		os.Exit(1)
	}
	if name, ok := clusterv3.Cluster_DiscoveryType_name[int32(clusterv3.Cluster_LOGICAL_DNS)]; !ok || name != "LOGICAL_DNS" {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected LOGICAL_DNS, got %q (ok=%v)\n", name, ok)
		os.Exit(1)
	}

	// Assertion 4: Cluster_DiscoveryType_name maps Cluster_EDS to "EDS" and Cluster_ORIGINAL_DST to "ORIGINAL_DST"
	if name, ok := clusterv3.Cluster_DiscoveryType_name[int32(clusterv3.Cluster_EDS)]; !ok || name != "EDS" {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected EDS, got %q (ok=%v)\n", name, ok)
		os.Exit(1)
	}
	if name, ok := clusterv3.Cluster_DiscoveryType_name[int32(clusterv3.Cluster_ORIGINAL_DST)]; !ok || name != "ORIGINAL_DST" {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: expected ORIGINAL_DST, got %q (ok=%v)\n", name, ok)
		os.Exit(1)
	}

	// Assertion 5: Cluster_DiscoveryType_name does not contain unmapped discovery type keys
	if _, ok := clusterv3.Cluster_DiscoveryType_name[999]; ok {
		fmt.Fprintf(os.Stderr, "assertion 5 failed: unexpected entry found for unmapped key 999\n")
		os.Exit(1)
	}

	fmt.Println("All contract assertions passed.")
}