<?php

function handler($event, $context)
{
    echo json_encode($context);
    return response("queryStringParameters, ". json_encode($event['queryStringParameters']));
}

function response($body)
{
    $headers = array(
        "Content-Type"=>"application/json"
    );
    return json_encode(array(
        "statusCode"=>200,
        "headers"=>$headers,
        "body"=>$body
    ));
}

#!/usr/bin/php
<?php

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

// This is the request processing loop. Barring unrecoverable failure, this loop runs until the environment shuts down.
do {
    // Ask the runtime API for next to handle.
    $next = getNext();
    try {
        // Obtain the function name from the _HANDLER environment variable and ensure the function's code is available.
        $handlerFunction = explode(".", getenv('_HANDLER'));
        require_once getenv('LAMBDA_TASK_ROOT') . '/' . $handlerFunction[0] . '.php';
        try {
            // Execute the desired function and obtain the response.
            $response = $handlerFunction[1]($next['event'], $next['context']);
            // Submit the response back to the runtime API.
            sendResponse($next['context']['aws_request_id'][0], $response);
        } catch (Throwable $e) {
            // Submit the error back to the runtime API.
            sendError($next['context']['aws_request_id'][0], $e);
        }
    } catch (Throwable $e) {
        // Submit the init error back to the runtime API.
        sendInitError($e);
    }
} while (true);

function getNext()
{
    $client = new \GuzzleHttp\Client();
    $response = $client->get('http://' . getenv('AWS_LAMBDA_RUNTIME_API') . '/2018-06-01/runtime/invocation/next');
    return [
      'event' => json_decode((string) $response->getBody(), true),
      'context' => [
        'function_name' => getenv('AWS_LAMBDA_FUNCTION_NAME'),
        'function_version' => getenv('AWS_LAMBDA_FUNCTION_VERSION'),
        'invoked_function_arn' => $response->getHeader('Lambda-Runtime-Invoked-Function-Arn'),
        'memory_limit_in_mb' => getenv('AWS_LAMBDA_FUNCTION_MEMORY_SIZE'),
        'aws_request_id' => $response->getHeader('Lambda-Runtime-Aws-Request-Id'),
        'log_group_name' => getenv('AWS_LAMBDA_LOG_GROUP_NAME'),
        'log_stream_name' => getenv('AWS_LAMBDA_LOG_STREAM_NAME'),
        'deadline_ms' => $response->getHeader('Lambda-Runtime-Deadline-Ms'),
        'trace_id' => $response->getHeader('Lambda-Runtime-Trace-Id'),
        'x_amzn_trace_id' => getenv('_X_AMZN_TRACE_ID'),
        'identity' => $response->getHeader('Lambda-Runtime-Cognito-Identity'),
        'client_context' => $response->getHeader('Lambda-Runtime-Client-Context')
      ]
    ];
}

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

function sendError($requestId, $error)
{
    $response = json_encode(array('errorMessage' => $error->getMessage(), 'errorType' => get_class($error)));
    $client = new \GuzzleHttp\Client();
    $client->post(
    'http://' . getenv('AWS_LAMBDA_RUNTIME_API') . '/2018-06-01/runtime/invocation/' . $requestId . '/error',
       [
           'body' => $response,
           'headers' => [
            'Lambda-Runtime-Function-Error-Type' => 'Unhandled'
            ]
        ]
    );
}

function sendInitError($error)
{
    $response = json_encode(array('errorMessage' => $error->getMessage(), 'errorType' => get_class($error)));
    $client = new \GuzzleHttp\Client();
    $client->post(
    'http://' . getenv('AWS_LAMBDA_RUNTIME_API') . '/2018-06-01/runtime/init/error',
       [
           'body' => $response,
           'headers' => [
            'Lambda-Runtime-Function-Error-Type' => 'Unhandled'
            ]
        ]
    );
}

#!/usr/bin/php
<?php

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

// This is the request processing loop. Barring unrecoverable failure, this loop runs until the environment shuts down.
do {
    // Ask the runtime API for next to handle.
    $next = getNext();
    try {
        // Obtain the function name from the _HANDLER environment variable and ensure the function's code is available.
        $handlerFunction = explode(".", getenv('_HANDLER'));
        require_once getenv('LAMBDA_TASK_ROOT') . '/' . $handlerFunction[0] . '.php';
        try {
            // Execute the desired function and obtain the response.
            $response = $handlerFunction[1]($next['event'], $next['context']);
            // Submit the response back to the runtime API.
            sendResponse($next['context']['aws_request_id'][0], $response);
        } catch (Throwable $e) {
            // Submit the error back to the runtime API.
            sendError($next['context']['aws_request_id'][0], $e);
        }
    } catch (Throwable $e) {
        // Submit the init error back to the runtime API.
        sendInitError($e);
    }
} while (true);