feat(platform): Ollama structured ouput support

Author: Guikingone

examples/ollama/structured-output-math.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Symfony\AI\Agent\Agent;
+use Symfony\AI\Agent\StructuredOutput\AgentProcessor;
+use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
+use Symfony\AI\Platform\Bridge\Ollama\Ollama;
+use Symfony\AI\Platform\Bridge\Ollama\PlatformFactory;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
+
+require_once dirname(__DIR__).'/bootstrap.php';
+
+$platform = PlatformFactory::create(env('OLLAMA_HOST_URL'), http_client());
+$model = new Ollama();
+
+$processor = new AgentProcessor();
+$agent = new Agent($platform, $model, [$processor], [$processor], logger());
+$messages = new MessageBag(
+    Message::forSystem('You are a helpful math tutor. Guide the user through the solution step by step.'),
+    Message::ofUser('how can I solve 8x + 7 = -23'),
+);
+$result = $agent->call($messages, ['output_structure' => MathReasoning::class]);
+
+dump($result->getContent());

src/platform/src/Bridge/Ollama/Ollama.php

@@ -45,6 +45,7 @@ class Ollama extends Model
         '/./' => [
             Capability::INPUT_MESSAGES,
             Capability::OUTPUT_TEXT,
+            Capability::OUTPUT_STRUCTURED,
         ],
         '/^llama\D*3(\D*\d+)/' => [
             Capability::TOOL_CALLING,

src/platform/src/Bridge/Ollama/OllamaClient.php

@@ -63,6 +63,11 @@ private function doCompletionRequest(array|string $payload, array $options = [])
         // Revert Ollama's default streaming behavior
         $options['stream'] ??= false;
 
+        if (array_key_exists('response_format', $options) && array_key_exists('json_schema', $options['response_format'])) {
+            $options['format'] = $options['response_format']['json_schema']['schema'];
+            unset($options['response_format']);
+        }
+
         return new RawHttpResult($this->httpClient->request('POST', \sprintf('%s/api/chat', $this->hostUrl), [
             'headers' => ['Content-Type' => 'application/json'],
             'json' => array_merge($options, $payload),

src/platform/tests/Bridge/Ollama/OllamaClientTest.php

@@ -0,0 +1,90 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Bridge\Ollama;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+use Symfony\AI\Platform\Bridge\Ollama\Ollama;
+use Symfony\AI\Platform\Bridge\Ollama\OllamaClient;
+use Symfony\AI\Platform\Model;
+use Symfony\Component\HttpClient\MockHttpClient;
+use Symfony\Component\HttpClient\Response\JsonMockResponse;
+
+#[CoversClass(OllamaClient::class)]
+#[UsesClass(Ollama::class)]
+#[UsesClass(Model::class)]
+final class OllamaClientTest extends TestCase
+{
+    public function testSupportsModel()
+    {
+        $client = new OllamaClient(new MockHttpClient(), 'http://localhost:1234');
+
+        $this->assertTrue($client->supports(new Ollama()));
+        $this->assertFalse($client->supports(new Model('any-model')));
+    }
+
+    public function testOutputStructureIsSupported()
+    {
+        $httpClient = new MockHttpClient([
+            new JsonMockResponse([
+                'capabilities' => ['completion', 'tools'],
+            ]),
+            new JsonMockResponse([
+                'model' => 'foo',
+                'response' => [
+                    'age' => 22,
+                    'available' => true,
+                ],
+                'done' => true,
+            ]),
+        ], 'http://127.0.0.1:1234');
+
+        $client = new OllamaClient($httpClient, 'http://127.0.0.1:1234');
+        $response = $client->request(new Ollama(), [
+            'messages' => [
+                [
+                    'role' => 'user',
+                    'content' => 'Ollama is 22 years old and is busy saving the world. Respond using JSON',
+                ],
+            ],
+            'model' => 'llama3.2',
+        ], [
+            'response_format' => [
+                'type' => 'json_schema',
+                'json_schema' => [
+                    'name' => 'clock',
+                    'strict' => true,
+                    'schema' => [
+                        'type' => 'object',
+                        'properties' => [
+                            'age' => ['type' => 'integer'],
+                            'available' => ['type' => 'boolean'],
+                        ],
+                        'required' => ['age', 'available'],
+                        'additionalProperties' => false,
+                    ],
+                ],
+            ]
+        ]);
+
+        $this->assertSame(2, $httpClient->getRequestsCount());
+        $this->assertSame([
+            'model' => 'foo',
+            'response' => [
+                'age' => 22,
+                'available' => true,
+            ],
+            'done' => true,
+        ], $response->getData());
+    }
+}