Add a simple health check

Check if the LDAP connections works

src/Service/HealthCheck.php

+<?php
+
+declare(strict_types=1);
+
+namespace Dbp\Relay\BasePersonConnectorLdapBundle\Service;
+
+use Dbp\Relay\CoreBundle\HealthCheck\CheckInterface;
+use Dbp\Relay\CoreBundle\HealthCheck\CheckOptions;
+use Dbp\Relay\CoreBundle\HealthCheck\CheckResult;
+
+class HealthCheck implements CheckInterface
+{
+    private $ldap;
+
+    public function __construct(LDAPApi $ldap)
+    {
+        $this->ldap = $ldap;
+    }
+
+    public function getName(): string
+    {
+        return 'base-person-connector-ldap';
+    }
+
+    private function checkMethod(string $description, callable $func): CheckResult
+    {
+        $result = new CheckResult($description);
+        try {
+            $func();
+        } catch (\Throwable $e) {
+            $result->set(CheckResult::STATUS_FAILURE, $e->getMessage(), ['exception' => $e]);
+
+            return $result;
+        }
+        $result->set(CheckResult::STATUS_SUCCESS);
+
+        return $result;
+    }
+
+    public function check(CheckOptions $options): array
+    {
+        $results = [];
+        $results[] = $this->checkMethod('Check if we can connect to the LDAP server', [$this->ldap, 'checkConnection']);
+
+        return $results;
+    }
+}

src/Service/LDAPApi.php

@@ -106,6 +106,13 @@ class LDAPApi implements LoggerAwareInterface, ServiceSubscriberInterface
         $this->providerConfig['port'] = ($encryption === 'start_tls') ? 389 : 636;
     }
 
+    public function checkConnection()
+    {
+        $provider = $this->getProvider();
+        $builder = $this->getCachedBuilder($provider);
+        $builder->first();
+    }
+
     public function setDeploymentEnvironment(string $env)
     {
         $this->deploymentEnv = $env;