From f263ae09b7a149c2be884908560528ce76aee511 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Julius=20H=C3=A4rtl?= <jus@bitgrid.net>
Date: Mon, 3 Jan 2022 11:17:28 +0100
Subject: [PATCH] Add hashed attribute column for indexed job existence check
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Julius Härtl <jus@bitgrid.net>
---
 .../Version24000Date20211230140012.php        | 67 +++++++++++++++++++
 lib/private/BackgroundJob/JobList.php         |  5 +-
 version.php                                   |  2 +-
 3 files changed, 71 insertions(+), 3 deletions(-)
 create mode 100644 core/Migrations/Version24000Date20211230140012.php

diff --git a/core/Migrations/Version24000Date20211230140012.php b/core/Migrations/Version24000Date20211230140012.php
new file mode 100644
index 00000000000..fc013338862
--- /dev/null
+++ b/core/Migrations/Version24000Date20211230140012.php
@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2022 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Core\Migrations;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\DB\Types;
+use OCP\IDBConnection;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version24000Date20211230140012 extends SimpleMigrationStep {
+	/** @var IDBConnection */
+	protected $connection;
+
+	public function __construct(IDBConnection $connection) {
+		$this->connection = $connection;
+	}
+
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable('jobs');
+		if (!$table->hasColumn('argument_hash')) {
+			$table->addColumn('argument_hash', Types::STRING, [
+				'notnull' => false,
+				'length' => 32,
+			]);
+			$table->addIndex(['class', 'argument_hash'], 'job_argument_hash');
+			return $schema;
+		}
+		return null;
+	}
+
+	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options) {
+		$update = $this->connection->getQueryBuilder();
+
+		$update->update('jobs')
+			->set('argument_hash', $update->func()->md5('argument'));
+
+		$update->executeStatement();
+	}
+}
diff --git a/lib/private/BackgroundJob/JobList.php b/lib/private/BackgroundJob/JobList.php
index 0e799595939..a088d4bc8d2 100644
--- a/lib/private/BackgroundJob/JobList.php
+++ b/lib/private/BackgroundJob/JobList.php
@@ -83,6 +83,7 @@ class JobList implements IJobList {
 				->values([
 					'class' => $query->createNamedParameter($class),
 					'argument' => $query->createNamedParameter($argumentJson),
+					'argument_hash' => $query->createNamedParameter(md5($argumentJson)),
 					'last_run' => $query->createNamedParameter(0, IQueryBuilder::PARAM_INT),
 					'last_checked' => $query->createNamedParameter($this->timeFactory->getTime(), IQueryBuilder::PARAM_INT),
 				]);
@@ -91,7 +92,7 @@ class JobList implements IJobList {
 				->set('reserved_at', $query->expr()->literal(0, IQueryBuilder::PARAM_INT))
 				->set('last_checked', $query->createNamedParameter($this->timeFactory->getTime(), IQueryBuilder::PARAM_INT))
 				->where($query->expr()->eq('class', $query->createNamedParameter($class)))
-				->andWhere($query->expr()->eq('argument', $query->createNamedParameter($argumentJson)));
+				->andWhere($query->expr()->eq('argument_hash', $query->createNamedParameter(md5($argumentJson))));
 		}
 		$query->execute();
 	}
@@ -146,7 +147,7 @@ class JobList implements IJobList {
 		$query->select('id')
 			->from('jobs')
 			->where($query->expr()->eq('class', $query->createNamedParameter($class)))
-			->andWhere($query->expr()->eq('argument', $query->createNamedParameter($argument)))
+			->andWhere($query->expr()->eq('argument_hash', $query->createNamedParameter(md5($argument))))
 			->setMaxResults(1);
 
 		$result = $query->execute();
diff --git a/version.php b/version.php
index c2565ca1ac3..086e2d3f1db 100644
--- a/version.php
+++ b/version.php
@@ -30,7 +30,7 @@
 // between betas, final and RCs. This is _not_ the public version number. Reset minor/patchlevel
 // when updating major/minor version number.
 
-$OC_Version = [21, 0, 8, 1];
+$OC_Version = [21, 0, 8, 2];
 
 // The human readable string
 $OC_VersionString = '21.0.8 RC3';