AwsGen - PHP classes for the AWS SDK

AwsGen generates strictly typed PHP classes that allow you to use Amazon Web Services with objects instead of arrays.

Installation

\Rtek\AwsGen has no runtime component, so require it as a development dependency:

$ composer require --dev rtek/aws-gen

Why Bother?

AWS has approximately 170 services with ~18,000 types. The SDK provides access to these services using \ArrayAccess and rich runtime metadata, but does not offer code-completion by realizing the API in PHP classes*.

\Rtek\AwsGen will generate PHP classes for the services and operations that you choose, while allowing you to use the underlying SDK at all times.

You can treat these classes as read-only, or embed them in your project as the basis for more sophisticated wrappers.

_{*If you used AwsGen for all services, there would be ~10x the number of files as the SDK}

An Example: S3 Service

Console generation

$ vendor/bin/aws-gen generate

 Search Service:
 > s3

 Choose Service [Search again]:
  [0] Stop searching
  [1] Search again
  [2] s3
  [3] s3:2006-03-01
  [4] s3control
  [5] s3control:2018-08-20
 > 2

 What namespace? [App\AwsGen\]:
 > App\AwsGen\

 What output directory? [src]:
 > src

 PSR-4 namespace prefix? [App\AwsGen\]:
  [0]
  [1] App\
  [2] App\AwsGen\
 > 1

Generating: s3
==============

 Added s3:latest
 Generating...
 ...Complete

 [OK] Wrote 294 files to src/AwsGen/

PHP generation

<?php

namespace App;

use Rtek\AwsGen\Generator;
use Rtek\AwsGen\Writer\DirWriter;

$gen = new Generator('App\\AwsGen');  //generate classes to the 'App\AwsGen' namespace
$gen->addService('s3', '2006-03-01'); //add the s3 service, version optional
DirWriter::create('src')              //set the root directory to write the files
    ->setPsr4Prefix('App\\')          //optionally set a PSR4 prefix
    ->write($gen);                    //writes App\AwsGen\S3 to src/AwsGen/S3

Usage

<?php 

namespace App;

use App\AwsGen\S3 as S3;

$config = [
    'credentials' => [
        'key' => '***',
        'secret' => '***',
    ],
    'region' => 'us-east-1', 
];
//generated client extends `\Aws\S3Client` with the same config as SDK except
//for `version` which is overridden by the specified generation version
$client = new S3\S3Client($config); 
                                    
//the operation input create(...) contains required params
$input = S3\CreateBucketRequest::create($bucket = 'test'); 

//they can be set directly just like optional params
$input->Bucket($bucket)->ACL('public-read');               
              
//operation names are the same as SDK   
$output = $client->createBucket($input);

//the operation output has getters that match the SDK 
echo "Bucket created at: {$output->Location()}\n"; 

//supports fluent interface
$output = $client->putObject(
    S3\PutObjectRequest::create($bucket, $key = 'foo.txt')
        ->Body('bar baz')->ContentType('text/plain')
);   

//`\ArrayAccess` works as usual since output classes extend `\Aws\Result`
echo "Created object {$key} with ETag {$output['ETag']}\n"; 

//supports setting values via array by constructor
$input = new S3\GetObjectRequest([
    'Bucket' => $bucket,
    'Key' => $key,
]);
$output = $client->getObject($input);
echo "The object has a body of: {$output->Body()}\n";

//you can bypass AwsGen classes by passing the array argument to the client
$result = $client->getObject([
    'Bucket' => $bucket,
    'Key' => $key,
]);
echo "The object still has a body of: {$result['Body']}\n";

//`\IteratorAggregate` is implemented for iterable properties
$output = $client->listObjectsV2(S3\ListObjectsV2Request::create($bucket));
foreach ($output->Contents() as $object) {
    $client->deleteObject(S3\DeleteObjectRequest::create($bucket, $object->getKey()));
}

Terms

• Service
  • An AWS service that has a Client and metadata
  • Contains multiple Operation and Shape
  • e.g. S3, DynamoDb, Ec2
• Operation
  • An AWS API call that does something
  • Has an Input and an Output
  • e.g. DynamoDb\DynamoDbClient::putItem(), S3\S3Client::getObject()
• Shape
  • An AWS type that can be serialized as an associative array
  • Accessors are read and write
  • e.g. S3\ObjectList, Ec2\Instance
• Input
  • A Shape that contains the input parameters for an Operation
  • Defines the expected Output for an Operation
  • Accessors are write-only
  • e.g. DynamoDb\PutItemInput, S3\ListObjectRequest
• Output
  • A Shape that contains the result of an Operation
  • Extends \Aws\Result
  • Accessors are read-only
  • e.g. DynamoDb\PutItemOutput, S3\ListObjectOutput
• Client
  • Extends the corresponding SDK client
  • Marshals an Input to the SDK Operation and returns the Output
  • e.g. S3\S3Client, DynamoDb\DynamoDbClient

Issues / Quriks

• Paginators are not implemented
• CommandPools are not implemented
• \Aws\Result::$data is passed by value to Output classes
• _ will be appended the PHP class name when:
  • A service contains two types with identical case-insensitive names
  • A type is a PHP keyword
• Some service names are oddly named vs the namespace: e.g. streams.dynamodb => DynamoDbStreams
• Some Input classes use the term Request instead of Input per the SDK metadata

Acknowledgements

• Inspired by goetas-webeservices/xsd2php