CustomVariables: add load from db support

library/Director/CustomVariable/CustomVariable.php

@@ -109,6 +109,25 @@ abstract class CustomVariable
         }
     }
 
+    public static function fromDbRow($row)
+    {
+        switch($row->format) {
+            case 'string':
+                return new CustomVariableString($row->varname, $row->varvalue);
+            case 'json':
+                return self::create($row->varname, json_decode($row->varvalue));
+            case 'expression':
+                throw new ProgrammingError(
+                    'Icinga code expressions are not yet supported'
+                );
+            default:
+                throw new ProgrammingError(
+                    '%s is not a supported custom variable format',
+                    $row->format
+                );
+        }
+    }
+
     public function __toString()
     {
         try {

library/Director/CustomVariable/CustomVariables.php

@@ -3,6 +3,7 @@
 namespace Icinga\Module\Director\CustomVariable;
 
 use Icinga\Module\Director\IcingaConfig\IcingaConfigHelper as c;
+use Icinga\Module\Director\Objects\IcingaObject;
 
 class CustomVariables
 {
@@ -38,6 +39,27 @@ class CustomVariables
         return $this;
     }
 
+    public static function loadForStoredObject(IcingaObject $object)
+    {
+        $db    = $object->getDb();
+
+        $query = $db->select()->from(
+            array('v' => $object->getVarsTableName()),
+            array(
+                'v.varname',
+                'v.varvalue',
+                'v.format',
+            )
+        )->where(sprintf('v.%s = ?', $object->getVarsIdColumn()), $object->getId());
+
+        $vars = new CustomVariables;
+        foreach ($db->fetchAll($query) as $row) {
+            $vars->vars[$row->varname] = CustomVariable::fromDbRow($row);
+        }
+
+        return $vars;
+    }
+
     public function get($key)
     {
         if (array_key_exists($key, $this->vars)) {

library/Director/Objects/IcingaObject.php

@@ -41,12 +41,27 @@ abstract class IcingaObject extends DbObject
     {
         $this->assertCustomVarsSupport();
         if ($this->vars === null) {
-            $this->vars = new CustomVariables();
+            if ($this->hasBeenLoadedFromDb()) {
+                $this->vars = CustomVariables::loadForStoredObject($this);
+            } else {
+                $this->vars = new CustomVariables();
+            }
         }
 
         return $this->vars;
     }
 
+    public function getVarsTableName()
+    {
+        return $this->getTableName() . '_var';
+    }
+
+    public function getVarsIdColumn()
+    {
+        // strlen('icinga_') = 7
+        return substr($this->getTableName(), 7) . '_id';
+    }
+
     public function isTemplate()
     {
         return $this->hasProperty('object_type')