1 files changed, 117 insertions, 0 deletions
diff --git a/www/wiki/includes/cache/localisation/LCStoreDB.php b/www/wiki/includes/cache/localisation/LCStoreDB.php
new file mode 100644
index 00000000..c57145c0
--- /dev/null
+++ b/www/wiki/includes/cache/localisation/LCStoreDB.php
@@ -0,0 +1,117 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+use Wikimedia\Rdbms\IDatabase;
+use Wikimedia\Rdbms\DBQueryError;
+
+/**
+ * LCStore implementation which uses the standard DB functions to store data.
+ * This will work on any MediaWiki installation.
+ */
+class LCStoreDB implements LCStore {
+
+	/** @var string */
+	private $currentLang;
+	/** @var bool */
+	private $writesDone = false;
+	/** @var IDatabase */
+	private $dbw;
+	/** @var array */
+	private $batch = [];
+	/** @var bool */
+	private $readOnly = false;
+
+	public function get( $code, $key ) {
+		if ( $this->writesDone && $this->dbw ) {
+			$db = $this->dbw; // see the changes in finishWrite()
+		} else {
+			$db = wfGetDB( DB_REPLICA );
+		}
+
+		$value = $db->selectField(
+			'l10n_cache',
+			'lc_value',
+			[ 'lc_lang' => $code, 'lc_key' => $key ],
+			__METHOD__
+		);
+
+		return ( $value !== false ) ? unserialize( $db->decodeBlob( $value ) ) : null;
+	}
+
+	public function startWrite( $code ) {
+		if ( $this->readOnly ) {
+			return;
+		} elseif ( !$code ) {
+			throw new MWException( __METHOD__ . ": Invalid language \"$code\"" );
+		}
+
+		$this->dbw = wfGetDB( DB_MASTER );
+		$this->readOnly = $this->dbw->isReadOnly();
+
+		$this->currentLang = $code;
+		$this->batch = [];
+	}
+
+	public function finishWrite() {
+		if ( $this->readOnly ) {
+			return;
+		} elseif ( is_null( $this->currentLang ) ) {
+			throw new MWException( __CLASS__ . ': must call startWrite() before finishWrite()' );
+		}
+
+		$this->dbw->startAtomic( __METHOD__ );
+		try {
+			$this->dbw->delete(
+				'l10n_cache',
+				[ 'lc_lang' => $this->currentLang ],
+				__METHOD__
+			);
+			foreach ( array_chunk( $this->batch, 500 ) as $rows ) {
+				$this->dbw->insert( 'l10n_cache', $rows, __METHOD__ );
+			}
+			$this->writesDone = true;
+		} catch ( DBQueryError $e ) {
+			if ( $this->dbw->wasReadOnlyError() ) {
+				$this->readOnly = true; // just avoid site down time
+			} else {
+				throw $e;
+			}
+		}
+		$this->dbw->endAtomic( __METHOD__ );
+
+		$this->currentLang = null;
+		$this->batch = [];
+	}
+
+	public function set( $key, $value ) {
+		if ( $this->readOnly ) {
+			return;
+		} elseif ( is_null( $this->currentLang ) ) {
+			throw new MWException( __CLASS__ . ': must call startWrite() before set()' );
+		}
+
+		$this->batch[] = [
+			'lc_lang' => $this->currentLang,
+			'lc_key' => $key,
+			'lc_value' => $this->dbw->encodeBlob( serialize( $value ) )
+		];
+	}
+
+}