Integrate Elasticsearch with Silex

Efficient integration of Elasticsearch and Silex: Building high-performance applications

This article discusses how to directly read Elasticsearch data by building a small Silex application to achieve efficient integration of the two. This requires setting Silex as a dependency in an existing Composer-based project and adding the Elasticsearch PHP SDK to Composer.

Core points:

• Under the integration of the two by creating a small Silex application to read data directly from Elasticsearch.
• Expose the Elasticsearch PHP SDK as a service to Silex's dependency injection container Pimple, making it easy to access the Elasticsearch Client class object.
• Create Silex controller to build Elasticsearch query parameters and execute the query. According to the results, use Twig template to render nodes or return a 404 error.
• Integrate Drupal, Elasticsearch and Silex to build high-performance applications: Drupal as a content management system, Elasticsearch as a high-performance data storage, and Silex as a PHP framework for fast data retrieval.

The integration of Drupal 7 and Elasticsearch has been explored in the previous article, with the goal of combining these two open source technologies to build high-performance applications with both advantages. (For related code, please refer to the Code Repository Link )

Next, we will create a small Silex app that reads and returns data directly from Elasticsearch.

Silex application construction

Silex is an excellent PHP microframework developed by the Symfony team. It is mainly based on Symfony components, but is more simplified and easy to use. The method to quickly build a Silex application is as follows:

1. Add to an existing project as a Composer dependency:

<code>"silex/silex": "~1.2",</code>

2. Create a new project with Silex scaffolding:

<code>composer.phar create-project fabpot/silex-skeleton</code>

Eventing Elasticsearch PHP SDK is required for accessing Elasticsearch. Add it to Composer:

<code>"elasticsearch/elasticsearch": "~1.0",</code>

If you use Twig to output data, you also need to add a Twig bridging component (ignored if it already exists):

<code>"symfony/twig-bridge": "~2.3"</code>

To use the SDK, we can expose it as a service to Pimple (Silex's dependency injection container). This can be done in multiple locations (see the code repository for specific examples), but after instantiating the Silex application, you can add the following code:

<code class="language-php">$app['elasticsearch'] = function() {
  return new Client(array());
};</code>

This creates a service in the application called elasticsearch, instantiating the Elasticsearch Client class object. Don't forget to go to the top useThe category:

<code class="language-php">use Elasticsearch\Client;</code>

Now, the Elasticsearch client can be accessed anywhere via $app['elasticsearch'].

Connect Elasticsearch

The previous article has imported node data into the node index, and each node type corresponds to an Elasticsearch document type. For example, the following code returns all nodes of article type:

<code>http://localhost:9200/node/article/_search</code>

We already know how to instantiate the Elasticsearch SDK client and now we can use it. One way is to create a controller:

<code>"silex/silex": "~1.2",</code>

Controller location depends on how Silex applications are organized. In my example it's in the src/Controller folder and is automatically loaded by Composer.

We also need to create a route to map to this controller. Again, there are multiple ways to deal with this, in my example I have a src/ file located in the routes.php folder and introduced in index.php:

<code>composer.phar create-project fabpot/silex-skeleton</code>

In this example, the controller obtains the Elasticsearch client, builds the query parameters, executes the query, checks the results, and uses the Twig template to render if the node is found, otherwise it returns a 404 error.

Using Twig requires registering a Twig service provider:

<code>"elasticsearch/elasticsearch": "~1.0",</code>

Then create the template file in the templates/ folder.

Conclusion

This article shows how to quickly build a Silex application and use it to return data from Elasticsearch. The goal is not to explain the details of these technologies, but to explore their integration solutions. As a content management system, Elasticsearch as a high-performance data storage, and Silex as a fast data retrieval framework, the combination of the three can build high-performance applications.

(More discussions on error handling, performance optimization, security policies, etc., as well as more detailed code examples and FAQs)

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