Function instanceIdFromSandboxId

packages/worker-utils/src/instance-id.ts:47–53

(sandboxId: string)

 * Throws if the sandboxId is not in the expected format.
 */
export function instanceIdFromSandboxId(sandboxId: string): string {
  if (!isInstanceKeyedSandboxId(sandboxId)) {
    throw new Error('Not an instance-keyed sandboxId (expected ki_ prefix, 35 chars)');
  }
  const hex = sandboxId.slice(3); // strip "ki_"
  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`;
}

/**
 * Return the subject used to bucket image-version rollouts.