potfur / health-json
Health JSON Schema implementation
Requires
- php: ^7.1
Requires (Dev)
- phpspec/phpspec: ^3.2
- phpunit/phpunit: ^5.7
This package is not auto-updated.
Last update: 2024-12-21 21:25:46 UTC
README
Lets say there is a service that needs to be checked periodically if is running.
Simplest solution would be to ping main site and if it responds with 200
everything is fine.
But, in reality service can not connect to database and response is served from outdated cache. Other case would be when everything works but mailing service is unreachable.
And this is where Health comes on stage. Health is an implementation of Health JSON Schema which standardises responses structure for monitoring endpoints.
How to use
Create instance of Health
where all services requiring monitoring will be registered
use Health\Health; use Health\Service\CallableService; $health = new Health( 'some-app', // application name 'healthy-server.com', // host name '1.2.3', // currently deployed version new \DateTime('2016-12-05T12:45:11+00:00') // deployment date ); $health->addService( 'database', // service group new CallableService( 'postgres', // service name function () use ($pdo) { $pdo->exec('SELECT 1'); }, // validating function true // true if service is essential ) );
When all services were registered, Health
can create status snapshots.
Such snapshot can be used to expose service health as simple true/false endpoint:
$state = $health->state(); $state->isHealthy(); // returns true if all services are working $state->summary(); // returns array with detailed information about all registered services
Example
In Symfony, for example
/ping
endpoint that returns 200 when essential services are working properly and 500 otherwise,/health
endpoint that shows summary for all services, response status code is reflectin its health
class HealthController extends Controller { /** * @Route("/ping", name="health_ping") */ public function pingAction(): Response { return (new Response())->setStatusCode($this->get('health')->status()->isHealthy(true) ? 200 : 500); } /** * @Route("/health", name="health_summary") */ public function healthAction(string $sku): Response { $status = $this->get('health')->status(); $response = new JsonResponse(); $response->setData($status->summary()); $response->setStatusCode($status->isHealthy() ? 200 : 500); return $response; } }