monitoring: Add last *comment columns to the host status queries

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

@@ -128,6 +128,18 @@ class HoststatusQuery extends IdoQuery
             'host_status_update_time'   => 'hs.status_update_time',
             'host_unhandled'            => 'CASE WHEN (hs.problem_has_been_acknowledged + hs.scheduled_downtime_depth) = 0 THEN 1 ELSE 0 END'
         ),
+        'lasthostackcomment' => array(
+            'host_last_ack' => 'hlac.last_ack_data'
+        ),
+        'lasthostcomment' => array(
+            'host_last_comment' => 'hlc.last_comment_data'
+        ),
+        'lasthostdowntimecomment' => array(
+            'host_last_downtime' => 'hldc.last_downtime_data'
+        ),
+        'lasthostflappingcomment' => array(
+            'host_last_flapping' => 'hlfc.last_flapping_data'
+        ),
         'servicegroups' => array(
             'servicegroup'          => 'sgo.name1 COLLATE latin1_general_ci',
             'servicegroup_name'     => 'sgo.name1',
@@ -143,6 +155,37 @@ class HoststatusQuery extends IdoQuery
         )
     );
 
+    /**
+     * Create a sub query to join comments into status query
+     *
+     * @param   int     $entryType
+     * @param   string  $alias
+     *
+     * @return  Zend_Db_Expr
+     */
+    protected function createLastCommentSubQuery($entryType, $alias)
+    {
+        $sql = <<<SQL
+SELECT
+  c.object_id,
+  '[' || c.author_name || '] ' || c.comment_data AS $alias
+FROM
+  icinga_comments c
+INNER JOIN
+  (
+    SELECT
+      MAX(comment_id) AS comment_id,
+      object_id
+    FROM
+      icinga_comments
+    WHERE
+      entry_type = $entryType
+    GROUP BY object_id
+  ) ec ON ec.comment_id = c.comment_id
+SQL;
+        return new Zend_Db_Expr('(' . $sql . ')');
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -205,6 +248,54 @@ class HoststatusQuery extends IdoQuery
         );
     }
 
+    /**
+     * Join last host acknowledgement comment
+     */
+    protected function joinLasthostackcomment()
+    {
+        $this->select->joinLeft(
+            array('hlac' => $this->createLastCommentSubQuery(4, 'last_ack_data')),
+            'hlac.object_id = ho.object_id',
+            array()
+        );
+    }
+
+    /**
+     * Join last host comment
+     */
+    protected function joinLasthostcomment()
+    {
+        $this->select->joinLeft(
+            array('hlc' => $this->createLastCommentSubQuery(1, 'last_comment_data')),
+            'hlc.object_id = ho.object_id',
+            array()
+        );
+    }
+
+    /**
+     * Join last host downtime comment
+     */
+    protected function joinLasthostdowntimeComment()
+    {
+        $this->select->joinLeft(
+            array('hldc' => $this->createLastCommentSubQuery(2, 'last_downtime_data')),
+            'hldc.object_id = ho.object_id',
+            array()
+        );
+    }
+
+    /**
+     * Join last host flapping comment
+     */
+    protected function joinLasthostflappingcomment()
+    {
+        $this->select->joinLeft(
+            array('hlfc' => $this->createLastCommentSubQuery(3, 'last_flapping_data')),
+            'hlfc.object_id = ho.object_id',
+            array()
+        );
+    }
+
     /**
      * Join service groups
      */