Allows to change the HTTP client in the factory

composer.json

@@ -11,9 +11,12 @@
     ],
     "require": {
         "php": "^8.1.0",
-        "guzzlehttp/guzzle": "^7.5.0"
+        "guzzlehttp/psr7": "^2.4.4",
+        "php-http/discovery": "^1.14",
+        "psr/http-client-implementation": "^1.0"
     },
     "require-dev": {
+        "guzzlehttp/guzzle": "^7.5.0",
         "laravel/pint": "^1.6.0",
         "nunomaduro/collision": "^7.0.5",
         "pestphp/pest": "^2.0.0",
@@ -42,7 +45,8 @@
         "sort-packages": true,
         "preferred-install": "dist",
         "allow-plugins": {
-            "pestphp/pest-plugin": true
+            "pestphp/pest-plugin": true,
+            "php-http/discovery": false
         }
     },
     "scripts": {

src/OpenAI.php

@@ -2,19 +2,20 @@
 
 declare(strict_types=1);
 
-use GuzzleHttp\Client as GuzzleClient;
+use Http\Discovery\Psr18ClientDiscovery;
 use OpenAI\Client;
 use OpenAI\Transporters\HttpTransporter;
 use OpenAI\ValueObjects\ApiKey;
 use OpenAI\ValueObjects\Transporter\BaseUri;
 use OpenAI\ValueObjects\Transporter\Headers;
+use Psr\Http\Client\ClientInterface;
 
 final class OpenAI
 {
     /**
      * Creates a new Open AI Client with the given API token.
      */
-    public static function client(string $apiKey, string $organization = null): Client
+    public static function client(string $apiKey, string $organization = null, ClientInterface $client = null): Client
     {
         $apiKey = ApiKey::from($apiKey);
 
@@ -26,7 +27,7 @@ public static function client(string $apiKey, string $organization = null): Clie
             $headers = $headers->withOrganization($organization);
         }
 
-        $client = new GuzzleClient();
+        $client ??= Psr18ClientDiscovery::find();
 
         $transporter = new HttpTransporter($client, $baseUri, $headers);
 

tests/Arch.php

@@ -33,6 +33,7 @@
 ]);
 
 test('openai')->expect('OpenAI')->toOnlyUse([
+    'Http\Discovery\Psr18ClientDiscovery',
     'Psr\Http\Client',
     'GuzzleHttp\Client',
     'GuzzleHttp\Psr7',

tests/OpenAI.php

@@ -1,5 +1,9 @@
 <?php
 
+use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\Handler\MockHandler;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Psr7\Response;
 use OpenAI\Client;
 
 it('may create a client', function () {
@@ -13,3 +17,18 @@
 
     expect($openAI)->toBeInstanceOf(Client::class);
 });
+
+it('accepts a custom http client', function () {
+    $mock = new MockHandler([
+        new Response(200, [], '{"id":"test-id","object":"text_completion","created":1589478378,"model":"text-davinci-003","choices":[{"text":"\n\nThis is indeed a test","index":0,"logprobs":null,"finish_reason":"length"}],"usage":{"prompt_tokens":5,"completion_tokens":7,"total_tokens":12}}'),
+    ]);
+    $handlerStack = HandlerStack::create($mock);
+    $client = new GuzzleClient(['handler' => $handlerStack]);
+    $openAI = OpenAI::client('foo', client: $client);
+    $response = $openAI->completions()->create([
+        'model' => 'text-davinci-003',
+        'prompt' => 'Say this is a test',
+    ]);
+
+    expect($response->id)->toBe('test-id');
+});