Consuming RESTful web services

Question

Is there any existing Drupal 8 module (on drupal.org, GitHub or anywhere else) that would leverage Guzzle to consume JSON and/or HAL+JSON Web Services over REST?

Alternatively, is the recommended way to necessarily write a custom module leveraging the Guzzle HTTP Client that ships with Drupal core?

My end goal is to be able to create a 1:1 relationship to map fields (node, user...) with key/value pairs from RESTful web services. Then I need to be able to read, update or delete those values.

Answer 1

OH, just realized now, maybe I misunderstood the question 100%

This is the code which basically generates the output:

$serializer = \Drupal::service('serializer'):
$output = $serializer->serialize($entity, $format);

with $format for example being 'json'.

Luckily the serializer is symetric, so you can do the same the other way round.

$client = \Drupal::service('http_client');
$result = $client->get('http://example.com/entity/node/1', ['Accept' => 'application/json']);
$output = $result->getBody();

$serializer = \Drupal::service('serializer'):
$entity = $serializer->deserialize($output, 'Drupal\node\Entity\Node', $format);

Answer 2

From the HTTP Client Manager module page:

Http Client Manager introduces a new Guzzle based plugin which allows you to manage HTTP clients using Guzzle Service Descriptions via JSON files, in a simple and efficient way

Answer 3

There is a module "RESTful Web Services" - Exposes entities and other resources as RESTful web API. The guzzle is the standard http client used in the Drupal core. "RESTful Web Services" It is modified module "Services" from Drupal 7. It is the service. But the idea is the same. To communicate any service with Drupal as a service.

https://www.youtube.com/watch?v=0mTTfCZ8Iac