3 files changed, 132 insertions, 0 deletions
diff --git a/library/Director/Import/PurgeStrategy/ImportRunBasedPurgeStrategy.php b/library/Director/Import/PurgeStrategy/ImportRunBasedPurgeStrategy.php
new file mode 100644
index 0000000..9f0e8ab
--- /dev/null
+++ b/library/Director/Import/PurgeStrategy/ImportRunBasedPurgeStrategy.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Icinga\Module\Director\Import\PurgeStrategy;
+
+use Icinga\Module\Director\Import\SyncUtils;
+use Icinga\Module\Director\Objects\ImportRun;
+use Icinga\Module\Director\Objects\ImportSource;
+
+class ImportRunBasedPurgeStrategy extends PurgeStrategy
+{
+    public function listObjectsToPurge()
+    {
+        $remove = array();
+
+        foreach ($this->getSyncRule()->fetchInvolvedImportSources() as $source) {
+            $remove += $this->checkImportSource($source);
+        }
+
+        return $remove;
+    }
+
+    protected function getLastSync()
+    {
+        return strtotime($this->getSyncRule()->getLastSyncTimestamp());
+    }
+
+    // TODO: NAMING!
+    protected function checkImportSource(ImportSource $source)
+    {
+        if (null === ($lastSync = $this->getLastSync())) {
+            // No last sync, nothing to purge
+            return array();
+        }
+
+        $runA = $source->fetchLastRunBefore($lastSync);
+        if ($runA === null) {
+            // Nothing to purge for this source
+            return array();
+        }
+
+        $runB = $source->fetchLastRun();
+        if ($runA->rowset_checksum === $runB->rowset_checksum) {
+            // Same source data, nothing to purge
+            return array();
+        }
+
+        return $this->listKeysRemovedBetween($runA, $runB);
+    }
+
+    public function listKeysRemovedBetween(ImportRun $runA, ImportRun $runB)
+    {
+        $rule = $this->getSyncRule();
+        $db = $rule->getDb();
+
+        $selectA = $runA->prepareImportedObjectQuery();
+        $selectB = $runB->prepareImportedObjectQuery();
+
+        $query = $db->select()->from(
+            array('a' => $selectA),
+            'a.object_name'
+        )->where('a.object_name NOT IN (?)', $selectB);
+
+        $result = $db->fetchCol($query);
+
+        if (empty($result)) {
+            return array();
+        }
+
+        if ($rule->hasCombinedKey()) {
+            $pattern = $rule->getSourceKeyPattern();
+            $columns = SyncUtils::getRootVariables(
+                SyncUtils::extractVariableNames($pattern)
+            );
+            $resultForCombinedKey = array();
+            foreach (array_chunk($result, 1000) as $keys) {
+                $rows = $runA->fetchRows($columns, null, $keys);
+                foreach ($rows as $row) {
+                    $resultForCombinedKey[] = SyncUtils::fillVariables($pattern, $row);
+                }
+            }
+            $result = $resultForCombinedKey;
+        }
+
+        if (empty($result)) {
+            return array();
+        }
+
+        return array_combine($result, $result);
+    }
+}
diff --git a/library/Director/Import/PurgeStrategy/PurgeNothingPurgeStrategy.php b/library/Director/Import/PurgeStrategy/PurgeNothingPurgeStrategy.php
new file mode 100644
index 0000000..3da8d4f
--- /dev/null
+++ b/library/Director/Import/PurgeStrategy/PurgeNothingPurgeStrategy.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Icinga\Module\Director\Import\PurgeStrategy;
+
+class PurgeNothingPurgeStrategy extends PurgeStrategy
+{
+    public function listObjectsToPurge()
+    {
+        return array();
+    }
+}
diff --git a/library/Director/Import/PurgeStrategy/PurgeStrategy.php b/library/Director/Import/PurgeStrategy/PurgeStrategy.php
new file mode 100644
index 0000000..ffbe14f
--- /dev/null
+++ b/library/Director/Import/PurgeStrategy/PurgeStrategy.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Icinga\Module\Director\Import\PurgeStrategy;
+
+use Icinga\Module\Director\Objects\SyncRule;
+
+abstract class PurgeStrategy
+{
+    private $rule;
+
+    public function __construct(SyncRule $rule)
+    {
+        $this->rule = $rule;
+    }
+
+    protected function getSyncRule()
+    {
+        return $this->rule;
+    }
+
+    abstract public function listObjectsToPurge();
+
+    /**
+     * @return PurgeStrategy
+     */
+    public static function load($name, SyncRule $rule)
+    {
+        $class = __NAMESPACE__ . '\\' . $name . 'PurgeStrategy';
+        return new $class($rule);
+    }
+}