go.opentelemetry.io/otel/trace v1.37.0: SpanKindClient

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 go.opentelemetry.io/otel/trace.SpanKindClient in pkg:golang/go.opentelemetry.io/otel/trace@v1.37.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/trace@v1.37.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/trace.SpanKindClient

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:f9af3f265ec5368f917f946e7d06b13df6a1b225df51612404d84d88344bc15c","contract":["trace.SpanKindClient == 3","trace.SpanKindClient.String() == \"client\"","trace.ValidateSpanKind(trace.SpanKindClient) == trace.SpanKindClient","trace.NewSpanStartConfig(trace.WithSpanKind(trace.SpanKindClient)).SpanKind() == trace.SpanKindClient"],"goal":"verify go.opentelemetry.io/otel/trace.SpanKindClient in pkg:golang/go.opentelemetry.io/otel/trace@v1.37.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/trace@v1.37.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/trace.SpanKindClient"]},"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/go.opentelemetry.io/otel/trace@v1.37.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/trace@v1.37.0","symbols":["go.opentelemetry.io/otel/trace.SpanKindClient"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.23.0

require go.opentelemetry.io/otel/trace v1.37.0

require go.opentelemetry.io/otel v1.37.0 // indirect

github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
go.opentelemetry.io/otel v1.37.0 h1:9zhNfelUvx0KBfu/gb+ZgeAfAgtWrfHJZcAqFC228wQ=
go.opentelemetry.io/otel v1.37.0/go.mod h1:ehE/umFRLnuLa/vSccNq9oS1ErUlkkK71gMcN34UG8I=
go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package main

import (
	"fmt"

	"go.opentelemetry.io/otel/trace"
)

func main() {
	kind := trace.SpanKindClient
	fmt.Printf("SpanKind: %s (%d)\n", kind.String(), kind)
}

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/trace.SpanKindClient in pkg:golang/go.opentelemetry.io/otel/trace@v1.37.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/trace@v1.37.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/trace.SpanKindClient"
  ]
}

package main

import (
	"fmt"
	"os"

	"go.opentelemetry.io/otel/trace"
)

func main() {
	// Verify SpanKindClient
	kind := trace.SpanKindClient

	// 1. Check integer value
	if int(kind) != 3 {
		fmt.Fprintf(os.Stderr, "expected SpanKindClient == 3, got %d\n", int(kind))
		os.Exit(1)
	}

	// 2. Check String() representation
	if kind.String() != "client" {
		fmt.Fprintf(os.Stderr, "expected SpanKindClient.String() == \"client\", got %q\n", kind.String())
		os.Exit(1)
	}

	// 3. Check ValidateSpanKind
	if trace.ValidateSpanKind(kind) != trace.SpanKindClient {
		fmt.Fprintf(os.Stderr, "expected ValidateSpanKind(SpanKindClient) == SpanKindClient\n")
		os.Exit(1)
	}

	// 4. Check WithSpanKind option
	cfg := trace.NewSpanStartConfig(trace.WithSpanKind(kind))
	if cfg.SpanKind() != trace.SpanKindClient {
		fmt.Fprintf(os.Stderr, "expected SpanStartConfig SpanKind to be SpanKindClient, got %v\n", cfg.SpanKind())
		os.Exit(1)
	}

	fmt.Println("contract assertions passed")
}