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

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_EdsClusterConfig 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_EdsClusterConfig

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:sha256:3c20251837b831074c4dffd6f3b26b7b7130daff7361534259285fdcb99d1c60","contract":["Cluster_EdsClusterConfig initializes with ServiceName and EdsConfig","Cluster_EdsClusterConfig.GetServiceName returns the configured service name or empty string when unset","Cluster_EdsClusterConfig.GetEdsConfig returns the ConfigSource or nil when unset","Cluster_EdsClusterConfig.Validate and ValidateAll pass on valid EDS cluster configuration","Cluster_EdsClusterConfig.ValidateAll returns an error when nested EdsConfig fails validation","Cluster.GetEdsClusterConfig returns the configured Cluster_EdsClusterConfig","Cluster_EdsClusterConfig.Reset clears all fields to their zero values"],"goal":"verify github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_EdsClusterConfig 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_EdsClusterConfig"]},"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@v1.37.0"],"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_EdsClusterConfig"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

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 github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3.Cluster_EdsClusterConfig 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_EdsClusterConfig"
  ]
}

package main

import (
	"fmt"
	"os"

	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() {
	if err := runTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract tests passed successfully.")
}

func runTests() error {
	// 1. Cluster_EdsClusterConfig initializes with ServiceName and EdsConfig
	configSource := &corev3.ConfigSource{
		ResourceApiVersion: corev3.ApiVersion_V3,
		ConfigSourceSpecifier: &corev3.ConfigSource_Ads{
			Ads: &corev3.AggregatedConfigSource{},
		},
		InitialFetchTimeout: durationpb.New(0),
	}
	edsConfig := &clusterv3.Cluster_EdsClusterConfig{
		ServiceName: "backend-service-eds",
		EdsConfig:   configSource,
	}

	// 2. Cluster_EdsClusterConfig.GetServiceName returns the configured service name or empty string when unset
	if edsConfig.GetServiceName() != "backend-service-eds" {
		return fmt.Errorf("expected ServiceName 'backend-service-eds', got %q", edsConfig.GetServiceName())
	}
	var nilEds *clusterv3.Cluster_EdsClusterConfig
	if nilEds.GetServiceName() != "" {
		return fmt.Errorf("expected empty string from nil Cluster_EdsClusterConfig.GetServiceName, got %q", nilEds.GetServiceName())
	}

	// 3. Cluster_EdsClusterConfig.GetEdsConfig returns the ConfigSource or nil when unset
	if edsConfig.GetEdsConfig() != configSource {
		return fmt.Errorf("expected GetEdsConfig to match configSource pointer")
	}
	if nilEds.GetEdsConfig() != nil {
		return fmt.Errorf("expected nil from nil Cluster_EdsClusterConfig.GetEdsConfig")
	}

	// 4. Cluster_EdsClusterConfig.Validate and ValidateAll pass on valid EDS cluster configuration
	if err := edsConfig.Validate(); err != nil {
		return fmt.Errorf("Validate failed unexpectedly: %w", err)
	}
	if err := edsConfig.ValidateAll(); err != nil {
		return fmt.Errorf("ValidateAll failed unexpectedly: %w", err)
	}

	// 5. Cluster_EdsClusterConfig.ValidateAll returns an error when nested EdsConfig fails validation
	invalidEds := &clusterv3.Cluster_EdsClusterConfig{
		EdsConfig: &corev3.ConfigSource{
			// Missing ConfigSourceSpecifier causes validation failure
			InitialFetchTimeout: &durationpb.Duration{Seconds: -1},
		},
	}
	if err := invalidEds.ValidateAll(); err == nil {
		return fmt.Errorf("expected ValidateAll to fail on invalid ConfigSource, got nil")
	}

	// 6. Cluster.GetEdsClusterConfig returns the configured Cluster_EdsClusterConfig
	cluster := &clusterv3.Cluster{
		Name:                 "service_backend_cluster",
		ClusterDiscoveryType: &clusterv3.Cluster_Type{Type: clusterv3.Cluster_EDS},
		EdsClusterConfig:     edsConfig,
	}
	if cluster.GetEdsClusterConfig() != edsConfig {
		return fmt.Errorf("expected Cluster.GetEdsClusterConfig to return configured edsConfig")
	}
	if cluster.GetEdsClusterConfig().GetServiceName() != "backend-service-eds" {
		return fmt.Errorf("expected service name backend-service-eds from cluster, got %q", cluster.GetEdsClusterConfig().GetServiceName())
	}

	// 7. Cluster_EdsClusterConfig.Reset clears all fields to their zero values
	toReset := &clusterv3.Cluster_EdsClusterConfig{
		ServiceName: "temporary-service",
		EdsConfig:   configSource,
	}
	toReset.Reset()
	if toReset.GetServiceName() != "" || toReset.GetEdsConfig() != nil {
		return fmt.Errorf("Reset did not clear fields: ServiceName=%q, EdsConfig=%v", toReset.GetServiceName(), toReset.GetEdsConfig())
	}

	return nil
}