Function fetchStackOutputs

packages/cli/src/commands/lambda/sam.ts:143–183

(opts: {
  stackName: string;
  region: string;
  awsProfile?: string;
})

 * Used after `samDeploy` to populate the local state file.
 */
export function fetchStackOutputs(opts: {
  stackName: string;
  region: string;
  awsProfile?: string;
}): StackOutputBag {
  assertAwsCliAvailable();
  const args = [
    "cloudformation",
    "describe-stacks",
    "--stack-name",
    opts.stackName,
    "--region",
    opts.region,
    "--query",
    "Stacks[0].Outputs",
    "--output",
    "json",
  ];
  if (opts.awsProfile) {
    args.unshift("--profile", opts.awsProfile);
  }
  const out = execFileSync("aws", args, { encoding: "utf-8" });
  const parsed = JSON.parse(out) as { OutputKey: string; OutputValue: string }[];
  const byKey = new Map(parsed.map((o) => [o.OutputKey, o.OutputValue]));
  const bucketName = byKey.get("RenderBucketName");
  const functionName = byKey.get("RenderFunctionArn");
  const stateMachineArn = byKey.get("RenderStateMachineArn");
  if (!bucketName || !functionName || !stateMachineArn) {
    throw new Error(
      `[lambda] stack ${opts.stackName} is missing one of RenderBucketName/RenderFunctionArn/RenderStateMachineArn. Got keys: ${[...byKey.keys()].join(", ")}`,
    );
  }
  return {
    bucketName,
    // RenderFunctionArn is the full ARN; the Lambda function name is the
    // last colon-segment, which downstream `getRenderProgress` calls use
    // for cost math + CloudWatch lookups.
    functionName: functionName.split(":").pop() ?? functionName,
    stateMachineArn,
  };
}