bootstrap

#!/opt/bin/php -d memory_limit=-1
<?php

// Adapted from https://aws.amazon.com/es/blogs/apn/aws-lambda-custom-runtime-for-php-a-practical-example/

// This invokes Composer's autoloader so that we'll be able to use Guzzle and any other 3rd party libraries we need.
require __DIR__ . '/vendor/autoload.php';

function getNextRequest()
{
    $client = new \GuzzleHttp\Client();
    $response = $client->get('http://' . $_ENV['AWS_LAMBDA_RUNTIME_API'] . '/2018-06-01/runtime/invocation/next');

    return [
      'invocationId' => $response->getHeader('Lambda-Runtime-Aws-Request-Id')[0],
      'payload' => json_decode((string) $response->getBody(), true)
    ];
}

function sendResponse($invocationId, $response)
{
    $client = new \GuzzleHttp\Client();
    $client->post(
    'http://' . $_ENV['AWS_LAMBDA_RUNTIME_API'] . '/2018-06-01/runtime/invocation/' . $invocationId . '/response',
       ['body' => $response]
    );
}

// This is the request processing loop. Barring unrecoverable failure, this loop runs until the environment shuts down.
do {
    // Ask the runtime API for a request to handle.
    $request = getNextRequest();

    // Obtain the function name from the _HANDLER environment variable and ensure the function's code is available.
    $handler = $_ENV['_HANDLER'];

    $namespace = explode('::', $handler)[0];
    $namespaceAppSrc = preg_replace("/^App\\\/", "src\\", $namespace);
    $namespacePath = explode('\\', $namespaceAppSrc);

    require_once($_ENV['LAMBDA_TASK_ROOT'] . "/" . implode("/", $namespacePath) . ".php");

    // Execute the desired function and obtain the response.
    $response = call_user_func($_ENV['_HANDLER'], $request['payload']);

    // Submit the response back to the runtime API.
    sendResponse($request['invocationId'], $response);
    
} while (true);