[Platform][Ollama] FallbackModelCatalog for custom platform

src/ai-bundle/config/services.php

@@ -46,7 +46,6 @@
 use Symfony\AI\Platform\Bridge\Mistral\ModelCatalog as MistralModelCatalog;
 use Symfony\AI\Platform\Bridge\Mistral\TokenOutputProcessor as MistralTokenOutputProcessor;
 use Symfony\AI\Platform\Bridge\Ollama\Contract\OllamaContract;
-use Symfony\AI\Platform\Bridge\Ollama\ModelCatalog as OllamaModelCatalog;
 use Symfony\AI\Platform\Bridge\OpenAi\Contract\OpenAiContract;
 use Symfony\AI\Platform\Bridge\OpenAi\ModelCatalog as OpenAiModelCatalog;
 use Symfony\AI\Platform\Bridge\OpenAi\TokenOutputProcessor as OpenAiTokenOutputProcessor;
@@ -67,6 +66,7 @@
 use Symfony\AI\Store\Command\DropStoreCommand;
 use Symfony\AI\Store\Command\IndexCommand;
 use Symfony\AI\Store\Command\SetupStoreCommand;
+use Symfony\Component\DependencyInjection\Reference;
 
 return static function (ContainerConfigurator $container): void {
     $container->services()
@@ -99,7 +99,6 @@
         ->set('ai.platform.model_catalog.huggingface', HuggingFaceModelCatalog::class)
         ->set('ai.platform.model_catalog.lmstudio', LmStudioModelCatalog::class)
         ->set('ai.platform.model_catalog.mistral', MistralModelCatalog::class)
-        ->set('ai.platform.model_catalog.ollama', OllamaModelCatalog::class)
         ->set('ai.platform.model_catalog.openai', OpenAiModelCatalog::class)
         ->set('ai.platform.model_catalog.openrouter', OpenRouterModelCatalog::class)
         ->set('ai.platform.model_catalog.perplexity', PerplexityModelCatalog::class)

src/ai-bundle/src/AiBundle.php

@@ -45,6 +45,7 @@
 use Symfony\AI\Platform\Bridge\Gemini\PlatformFactory as GeminiPlatformFactory;
 use Symfony\AI\Platform\Bridge\LmStudio\PlatformFactory as LmStudioPlatformFactory;
 use Symfony\AI\Platform\Bridge\Mistral\PlatformFactory as MistralPlatformFactory;
+use Symfony\AI\Platform\Bridge\Ollama\OllamaCatalog;
 use Symfony\AI\Platform\Bridge\Ollama\PlatformFactory as OllamaPlatformFactory;
 use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory as OpenAiPlatformFactory;
 use Symfony\AI\Platform\Bridge\OpenRouter\PlatformFactory as OpenRouterPlatformFactory;
@@ -442,7 +443,14 @@ private function processPlatformConfig(string $type, array $platform, ContainerB
         }
 
         if ('ollama' === $type) {
-            $platformId = 'ai.platform.ollama';
+            $catalogDefinition = (new Definition(OllamaCatalog::class))
+                ->setArguments([
+                    $platform['host_url'],
+                    new Reference('http_client'),
+                ]);
+
+            $container->setDefinition('ai.platform.model_catalog.ollama', $catalogDefinition);
+
             $definition = (new Definition(Platform::class))
                 ->setFactory(OllamaPlatformFactory::class.'::create')
                 ->setLazy(true)
@@ -455,7 +463,7 @@ private function processPlatformConfig(string $type, array $platform, ContainerB
                 ])
                 ->addTag('ai.platform', ['name' => 'ollama']);
 
-            $container->setDefinition($platformId, $definition);
+            $container->setDefinition('ai.platform.ollama', $definition);
 
             return;
         }

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

@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Platform\Bridge\Ollama;
+
+use Symfony\AI\Platform\Exception\InvalidArgumentException;
+use Symfony\AI\Platform\Model;
+use Symfony\AI\Platform\ModelCatalog\DynamicModelCatalog;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+
+final class OllamaCatalog extends DynamicModelCatalog
+{
+    public function __construct(
+        private readonly string $host,
+        private readonly HttpClientInterface $httpClient,
+    ) {
+        parent::__construct();
+    }
+
+    public function getModel(string $modelName): Model
+    {
+        $model = parent::getModel($modelName);
+
+        $response = $this->httpClient->request('POST', \sprintf('%s/api/show', $this->host), [
+            'json' => [
+                'model' => $model->getName(),
+            ],
+        ]);
+
+        $payload = $response->toArray();
+
+        if ([] === $payload['capabilities'] ?? []) {
+            throw new InvalidArgumentException('The model information could not be retrieved from the Ollama API. Your Ollama server might be too old. Try upgrade it.');
+        }
+
+        return new Ollama($model->getName(), $payload['capabilities'], $model->getOptions());
+    }
+}

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

@@ -35,21 +35,9 @@ public function supports(Model $model): bool
 
     public function request(Model $model, array|string $payload, array $options = []): RawHttpResult
     {
-        $response = $this->httpClient->request('POST', \sprintf('%s/api/show', $this->hostUrl), [
-            'json' => [
-                'model' => $model->getName(),
-            ],
-        ]);
-
-        $capabilities = $response->toArray()['capabilities'] ?? null;
-
-        if (null === $capabilities) {
-            throw new InvalidArgumentException('The model information could not be retrieved from the Ollama API. Your Ollama server might be too old. Try upgrade it.');
-        }
-
         return match (true) {
-            \in_array('completion', $capabilities, true) => $this->doCompletionRequest($payload, $options),
-            \in_array('embedding', $capabilities, true) => $this->doEmbeddingsRequest($model, $payload, $options),
+            \in_array('completion', $model->getCapabilities(), true) => $this->doCompletionRequest($payload, $options),
+            \in_array('embedding', $model->getCapabilities(), true) => $this->doEmbeddingsRequest($model, $payload, $options),
             default => throw new InvalidArgumentException(\sprintf('Unsupported model "%s": "%s".', $model::class, $model->getName())),
         };
     }

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

@@ -26,15 +26,15 @@ final class PlatformFactory
     public static function create(
         string $hostUrl = 'http://localhost:11434',
         ?HttpClientInterface $httpClient = null,
-        ModelCatalogInterface $modelCatalog = new ModelCatalog(),
+        ?ModelCatalogInterface $modelCatalog = null,
         ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
 
         return new Platform(
             [new OllamaClient($httpClient, $hostUrl)],
             [new OllamaResultConverter()],
-            $modelCatalog,
+            $modelCatalog ?? new OllamaCatalog($hostUrl, $httpClient),
             $contract ?? OllamaContract::create(),
         );
     }