1 files changed, 181 insertions, 0 deletions
diff --git a/www/wiki/includes/libs/redis/RedisConnRef.php b/www/wiki/includes/libs/redis/RedisConnRef.php
new file mode 100644
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+++ b/www/wiki/includes/libs/redis/RedisConnRef.php
@@ -0,0 +1,181 @@
+<?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 Psr\Log\LoggerInterface;
+use Psr\Log\LoggerAwareInterface;
+
+/**
+ * Helper class to handle automatically marking connectons as reusable (via RAII pattern)
+ *
+ * This class simply wraps the Redis class and can be used the same way
+ *
+ * @ingroup Redis
+ * @since 1.21
+ */
+class RedisConnRef implements LoggerAwareInterface {
+	/** @var RedisConnectionPool */
+	protected $pool;
+	/** @var Redis */
+	protected $conn;
+
+	protected $server; // string
+	protected $lastError; // string
+
+	/**
+	 * @var LoggerInterface
+	 */
+	protected $logger;
+
+	/**
+	 * @param RedisConnectionPool $pool
+	 * @param string $server
+	 * @param Redis $conn
+	 * @param LoggerInterface $logger
+	 */
+	public function __construct(
+		RedisConnectionPool $pool, $server, Redis $conn, LoggerInterface $logger
+	) {
+		$this->pool = $pool;
+		$this->server = $server;
+		$this->conn = $conn;
+		$this->logger = $logger;
+	}
+
+	public function setLogger( LoggerInterface $logger ) {
+		$this->logger = $logger;
+	}
+
+	/**
+	 * @return string
+	 * @since 1.23
+	 */
+	public function getServer() {
+		return $this->server;
+	}
+
+	public function getLastError() {
+		return $this->lastError;
+	}
+
+	public function clearLastError() {
+		$this->lastError = null;
+	}
+
+	public function __call( $name, $arguments ) {
+		$conn = $this->conn; // convenience
+
+		// Work around https://github.com/nicolasff/phpredis/issues/70
+		$lname = strtolower( $name );
+		if ( ( $lname === 'blpop' || $lname == 'brpop' )
+			&& is_array( $arguments[0] ) && isset( $arguments[1] )
+		) {
+			$this->pool->resetTimeout( $conn, $arguments[1] + 1 );
+		} elseif ( $lname === 'brpoplpush' && isset( $arguments[2] ) ) {
+			$this->pool->resetTimeout( $conn, $arguments[2] + 1 );
+		}
+
+		$conn->clearLastError();
+		try {
+			$res = call_user_func_array( [ $conn, $name ], $arguments );
+			if ( preg_match( '/^ERR operation not permitted\b/', $conn->getLastError() ) ) {
+				$this->pool->reauthenticateConnection( $this->server, $conn );
+				$conn->clearLastError();
+				$res = call_user_func_array( [ $conn, $name ], $arguments );
+				$this->logger->info(
+					"Used automatic re-authentication for method '$name'.",
+					[ 'redis_server' => $this->server ]
+				);
+			}
+		} catch ( RedisException $e ) {
+			$this->pool->resetTimeout( $conn ); // restore
+			throw $e;
+		}
+
+		$this->lastError = $conn->getLastError() ?: $this->lastError;
+
+		$this->pool->resetTimeout( $conn ); // restore
+
+		return $res;
+	}
+
+	/**
+	 * @param string $script
+	 * @param array $params
+	 * @param int $numKeys
+	 * @return mixed
+	 * @throws RedisException
+	 */
+	public function luaEval( $script, array $params, $numKeys ) {
+		$sha1 = sha1( $script ); // 40 char hex
+		$conn = $this->conn; // convenience
+		$server = $this->server; // convenience
+
+		// Try to run the server-side cached copy of the script
+		$conn->clearLastError();
+		$res = $conn->evalSha( $sha1, $params, $numKeys );
+		// If we got a permission error reply that means that (a) we are not in
+		// multi()/pipeline() and (b) some connection problem likely occurred. If
+		// the password the client gave was just wrong, an exception should have
+		// been thrown back in getConnection() previously.
+		if ( preg_match( '/^ERR operation not permitted\b/', $conn->getLastError() ) ) {
+			$this->pool->reauthenticateConnection( $server, $conn );
+			$conn->clearLastError();
+			$res = $conn->eval( $script, $params, $numKeys );
+			$this->logger->info(
+				"Used automatic re-authentication for Lua script '$sha1'.",
+				[ 'redis_server' => $server ]
+			);
+		}
+		// If the script is not in cache, use eval() to retry and cache it
+		if ( preg_match( '/^NOSCRIPT/', $conn->getLastError() ) ) {
+			$conn->clearLastError();
+			$res = $conn->eval( $script, $params, $numKeys );
+			$this->logger->info(
+				"Used eval() for Lua script '$sha1'.",
+				[ 'redis_server' => $server ]
+			);
+		}
+
+		if ( $conn->getLastError() ) { // script bug?
+			$this->logger->error(
+				'Lua script error on server "{redis_server}": {lua_error}',
+				[
+					'redis_server' => $server,
+					'lua_error' => $conn->getLastError()
+				]
+			);
+		}
+
+		$this->lastError = $conn->getLastError() ?: $this->lastError;
+
+		return $res;
+	}
+
+	/**
+	 * @param Redis $conn
+	 * @return bool
+	 */
+	public function isConnIdentical( Redis $conn ) {
+		return $this->conn === $conn;
+	}
+
+	function __destruct() {
+		$this->pool->freeConnection( $this->server, $this->conn );
+	}
+}