monitoring/ido: implement IDO version support

We want to make use of new IDO features without breaking compatibility.
This is a quickfix as otherwise we would currently break everything
below 1.10. Code contains a few TODOs as this needs improvement.

modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php

@@ -35,6 +35,8 @@ use Icinga\Application\Benchmark;
 use Icinga\Exception\ProgrammingError;
 use Icinga\Filter\Query\Tree;
 use Icinga\Module\Monitoring\Filter\UrlViewFilter;
+use Icinga\Application\Icinga;
+use Icinga\Web\Session;
 
 /**
  * Base class for Ido Queries
@@ -184,6 +186,18 @@ abstract class IdoQuery extends Query
      */
     protected $allowCustomVars = false;
 
+    /**
+     * Current IDO version. This is bullshit and needs to be moved somewhere
+     * else. As someone decided that we need no Backend-specific connection
+     * class unfortunately there is no better place right now. And as of the
+     * 'check_source' patch we need a quick fix immediately. So here you go.
+     *
+     * TODO: Fix this.
+     *
+     * @var string
+     */
+    protected static $idoVersion;
+
     /**
      * Return true when the column is an aggregate column
      *
@@ -580,4 +594,29 @@ abstract class IdoQuery extends Query
         $query = new $class($this->ds, $columns);
         return $query;
     }
+
+    // TODO: Move this away, see note related to $idoVersion var
+    protected function getIdoVersion()
+    {
+        if (self::$idoVersion === null) {
+            $session = null;
+            if (Icinga::app()->isWeb()) {
+                // TODO: Once we have version per connection we should choose a
+                //       namespace based on resource name
+                $session = Session::getSession()->getNamespace('monitoring/ido');
+                if (isset($session->version)) {
+                    self::$idoVersion = $session->version;
+                    return self::$idoVersion;
+                }
+            }
+            self::$idoVersion = $this->db->fetchOne(
+                $this->db->select()->from($this->prefix . 'dbversion', 'version')
+            );
+            if ($session !== null) {
+                $session->version = self::$idoVersion;
+                $session->write(); // <- WHY? I don't want to care about this!
+            }
+        }
+        return self::$idoVersion;
+    }
 }

modules/monitoring/library/Monitoring/Backend/Ido/Query/StatusQuery.php

@@ -305,6 +305,10 @@ class StatusQuery extends IdoQuery
 
     protected function joinBaseTables()
     {
+        if (version_compare($this->getIdoVersion(), '1.10.0', '<')) {
+            $this->columnMap['hoststatus']['host_check_source'] = '(NULL)';
+            $this->columnMap['servicestatus']['service_check_source'] = '(NULL)';
+        }
         $this->baseQuery = $this->db->select()->from(
             array('ho' => $this->prefix . 'objects'),
             array()

modules/monitoring/library/Monitoring/DataView/ServiceStatus.php

@@ -103,7 +103,7 @@ class ServiceStatus extends DataView
             'service_hard_state',
             'service_problem',
             'service_perfdata',
-	    'service_check_source',
+            'service_check_source',
             'service_active_checks_enabled',
             'service_active_checks_enabled_changed',
             'service_passive_checks_enabled',