README

Requirements

• PHP 7.3+
• Composer

Installation

Run composer require netolabs/php-lambda-runtime from the root of your project.

You'll need two files in root of your project for your application to work in Lambda, bootstrap and app.php.

• bootstrap can be copied directly from this library (see bin/bootstrap) and should not require any modification.

• app.php is where you instantiate the App object and define the middleware your application requires. Since the bootstrap script sets up the autoloader, you do not need to do this in your app.php.

Also required is a PHP binary compiled to run in the AWS Lambda environment. Documentation on how to build your own can be found here.

Deploying to AWS

When you're ready to ship your new function you'll need to create a Zip file containing app.php, bootstrap, src, vendor and your PHP binary in bin/php (or use a Lambda layer). The Zip file can then be uploaded via the AWS console or your favourite IaC tool.

Using Middleware

This library uses PSR-15 compliant Middleware. If you want to learn more about how to write and use middleware, have a look at these resources:

• https://mwop.net/blog/2018-01-23-psr-15.html
• http://www.slimframework.com/docs/v4/concepts/middleware.html
• https://github.com/middlewares/awesome-psr15-middlewares

While reusable middleware is great for application logic such as authentication, logging, exception handling and such, it's generally not advisable to put business logic in your middleware.

Examples

These are some basic examples of an app.php file.

Anonymous function

In this example we use an anonymous function to output "hello world" in the response body.

<?php
$app = \Neto\Lambda\Application\AppFactory::create();
$app->addCallable(function() {
    return 'hello world';
});
$app->run();

Anonymous function using Response object

You can also return a Response object if you'd like to manipulate the headers, status code, etc. This example has a header of foo: bar and a response body of baz.

<?php
$app = \Neto\Lambda\Application\AppFactory::create();
$app->addCallable(function() {
    return new \GuzzleHttp\Psr7\Response(200, [ 'foo' => 'bar' ], 'baz');
});
$app->run();

Adding middleware

This example uses the provided HelloWorld middleware to return a response with modified headers and body.

<?php
$app = \Neto\Lambda\Application\AppFactory::create();
$app->addMiddleware(new \Neto\Lambda\Middleware\HelloWorld())
    ->run();

If invoked from the command-line, you would expect to see the following

Status code 200

Headers
hello: world

Response body
{"success":true,"message":"Hello world!"}

Duration: 0.006911039352417ms

Testing locally

Invoking from the command line

To run your lambda from the command line, you can simply run vendor/bin/invoke. There are two optional parameters, handler name (-h) and request body data (-d).

Running a local server

You can also use PHPs built-in web server to test and send requests to your lambda. Simply start the server by running vendor/bin/start_server handler.name [hostname] [port]. You can then send requests to your function via curl, eg: curl --data '{"foo":"bar"}' localhost

License

The MIT License (MIT). Please see the License File for more information.