github.com/aws/aws-lambda-go v1.13.3: lambdacontext.NewContext

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 lambdacontext.NewContext in pkg:golang/github.com/aws/aws-lambda-go@v1.13.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/aws/aws-lambda-go@v1.13.3
Demonstrate these symbols/APIs:
  - lambdacontext.NewContext

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:sha256:97a6f86c9d875bb999153eb4cd11fa22ae87cb83ca88298ca6e6325321acb462","contract":["lambdacontext.NewContext(parent, lc) stores *lambdacontext.LambdaContext in the returned context.Context","lambdacontext.FromContext(ctx) retrieves the exact *lambdacontext.LambdaContext pointer stored by lambdacontext.NewContext and returns ok == true","the parent context passed to lambdacontext.NewContext remains unmodified"],"goal":"verify lambdacontext.NewContext in pkg:golang/github.com/aws/aws-lambda-go@v1.13.3","kind":"HOW","packages":["pkg:golang/github.com/aws/aws-lambda-go@v1.13.3"],"schemaVersion":1,"symbols":["lambdacontext.NewContext"]},"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/aws/aws-lambda-go@v1.13.3"],"schemaVersion":1,"subject":"pkg:golang/github.com/aws/aws-lambda-go@v1.13.3","symbols":["lambdacontext.NewContext"],"verifierAdapter":"golang@1"}

module sample

go 1.21

require github.com/aws/aws-lambda-go v1.13.3

github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/aws/aws-lambda-go v1.13.3 h1:SuCy7H3NLyp+1Mrfp+m80jcbi9KYWAs9/BXwppwRDzY=
github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

{
  "schemaVersion": 1,
  "goal": "verify lambdacontext.NewContext in pkg:golang/github.com/aws/aws-lambda-go@v1.13.3",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/aws/aws-lambda-go@v1.13.3"
  ],
  "symbols": [
    "lambdacontext.NewContext"
  ]
}

package main

import (
	"context"
	"fmt"
	"os"

	"github.com/aws/aws-lambda-go/lambdacontext"
)

func main() {
	lc := &lambdacontext.LambdaContext{
		AwsRequestID:       "req-12345",
		InvokedFunctionArn: "arn:aws:lambda:us-east-1:000000000000:function:example",
		Identity: lambdacontext.CognitoIdentity{
			CognitoIdentityID:     "id-1",
			CognitoIdentityPoolID: "pool-1",
		},
		ClientContext: lambdacontext.ClientContext{
			Env:    map[string]string{"env": "test"},
			Custom: map[string]string{"custom": "val"},
		},
	}

	parent := context.Background()
	ctx := lambdacontext.NewContext(parent, lc)
	if ctx == nil {
		fmt.Fprintln(os.Stderr, "expected non-nil context")
		os.Exit(1)
	}

	got, ok := lambdacontext.FromContext(ctx)
	if !ok || got == nil {
		fmt.Fprintln(os.Stderr, "expected LambdaContext from context")
		os.Exit(1)
	}

	if got != lc {
		fmt.Fprintln(os.Stderr, "expected exact LambdaContext pointer")
		os.Exit(1)
	}

	if got.AwsRequestID != "req-12345" {
		fmt.Fprintf(os.Stderr, "unexpected AwsRequestID: %s\n", got.AwsRequestID)
		os.Exit(1)
	}
	if got.InvokedFunctionArn != "arn:aws:lambda:us-east-1:000000000000:function:example" {
		fmt.Fprintf(os.Stderr, "unexpected InvokedFunctionArn: %s\n", got.InvokedFunctionArn)
		os.Exit(1)
	}
	if got.Identity.CognitoIdentityID != "id-1" || got.Identity.CognitoIdentityPoolID != "pool-1" {
		fmt.Fprintln(os.Stderr, "unexpected Identity fields")
		os.Exit(1)
	}
	if got.ClientContext.Env["env"] != "test" || got.ClientContext.Custom["custom"] != "val" {
		fmt.Fprintln(os.Stderr, "unexpected ClientContext fields")
		os.Exit(1)
	}

	if _, ok := lambdacontext.FromContext(parent); ok {
		fmt.Fprintln(os.Stderr, "expected parent context not to contain LambdaContext")
		os.Exit(1)
	}
}