Allow diviner books to be permanently destroyed

Summary: Fixes T7182.

Test Plan: Deleted a book with `./bin/remove destroy`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7182

Differential Revision: https://secure.phabricator.com/D11742

src/applications/diviner/storage/DivinerLiveBook.php

@@ -1,7 +1,9 @@
 <?php
 
 final class DivinerLiveBook extends DivinerDAO
-  implements PhabricatorPolicyInterface {
+  implements
+    PhabricatorPolicyInterface,
+    PhabricatorDestructibleInterface {
 
   protected $name;
   protected $viewPolicy;
@@ -82,4 +84,25 @@ final class DivinerLiveBook extends DivinerDAO
     return null;
   }
 
+/* -(  PhabricatorDestructibleInterface  )----------------------------------- */
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+      $atoms = id(new DivinerAtomQuery())
+        ->setViewer(PhabricatorUser::getOmnipotentUser())
+        ->withBookPHIDs(array($this->getPHID()))
+        ->withIncludeGhosts(true)
+        ->withIncludeUndocumentable(true)
+        ->execute();
+
+      foreach ($atoms as $atom) {
+        $engine->destroyObject($atom);
+      }
+
+      $this->delete();
+    $this->saveTransaction();
+  }
+
 }

src/applications/diviner/storage/DivinerLiveSymbol.php

@@ -1,7 +1,10 @@
 <?php
 
 final class DivinerLiveSymbol extends DivinerDAO
-  implements PhabricatorPolicyInterface, PhabricatorMarkupInterface {
+  implements
+    PhabricatorPolicyInterface,
+    PhabricatorMarkupInterface,
+    PhabricatorDestructibleInterface {
 
   protected $bookPHID;
   protected $context;
@@ -242,4 +245,22 @@ final class DivinerLiveSymbol extends DivinerDAO
     return true;
   }
 
+/* -(  PhabricatorDestructibleInterface  )----------------------------------- */
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+      $conn_w = $this->establishConnection('w');
+
+      queryfx(
+        $conn_w,
+        'DELETE FROM %T WHERE symbolPHID = %s',
+        id(new DivinerLiveAtom())->getTableName(),
+        $this->getPHID());
+
+      $this->delete();
+    $this->saveTransaction();
+  }
+
 }