1 files changed, 0 insertions, 295 deletions
diff --git a/includes/filerepo/backend/lockmanager/LSLockManager.php b/includes/filerepo/backend/lockmanager/LSLockManager.php
deleted file mode 100644
index b7ac743c..00000000
--- a/includes/filerepo/backend/lockmanager/LSLockManager.php
+++ /dev/null
@@ -1,295 +0,0 @@
-<?php
-
-/**
- * Manage locks using a lock daemon server.
- *
- * Version of LockManager based on using lock daemon servers.
- * This is meant for multi-wiki systems that may share files.
- * All locks are non-blocking, which avoids deadlocks.
- *
- * All lock requests for a resource, identified by a hash string, will map
- * to one bucket. Each bucket maps to one or several peer servers, each
- * running LockServerDaemon.php, listening on a designated TCP port.
- * A majority of peers must agree for a lock to be acquired.
- *
- * @ingroup LockManager
- * @since 1.19
- */
-class LSLockManager extends LockManager {
-	/** @var Array Mapping of lock types to the type actually used */
-	protected $lockTypeMap = array(
-		self::LOCK_SH => self::LOCK_SH,
-		self::LOCK_UW => self::LOCK_SH,
-		self::LOCK_EX => self::LOCK_EX
-	);
-
-	/** @var Array Map of server names to server config */
-	protected $lockServers; // (server name => server config array)
-	/** @var Array Map of bucket indexes to peer server lists */
-	protected $srvsByBucket; // (bucket index => (lsrv1, lsrv2, ...))
-
-	/** @var Array Map Server connections (server name => resource) */
-	protected $conns = array();
-
-	protected $connTimeout; // float number of seconds
-	protected $session = ''; // random SHA-1 string
-
-	/**
-	 * Construct a new instance from configuration.
-	 * 
-	 * $config paramaters include:
-	 *     'lockServers'  : Associative array of server names to configuration.
-	 *                      Configuration is an associative array that includes:
-	 *                      'host'    - IP address/hostname
-	 *                      'port'    - TCP port
-	 *                      'authKey' - Secret string the lock server uses
-	 *     'srvsByBucket' : Array of 1-16 consecutive integer keys, starting from 0,
-	 *                      each having an odd-numbered list of server names (peers) as values.
-	 *     'connTimeout'  : Lock server connection attempt timeout. [optional]
-	 *
-	 * @param Array $config 
-	 */
-	public function __construct( array $config ) {
-		$this->lockServers = $config['lockServers'];
-		// Sanitize srvsByBucket config to prevent PHP errors
-		$this->srvsByBucket = array_filter( $config['srvsByBucket'], 'is_array' );
-		$this->srvsByBucket = array_values( $this->srvsByBucket ); // consecutive
-
-		if ( isset( $config['connTimeout'] ) ) {
-			$this->connTimeout = $config['connTimeout'];
-		} else {
-			$this->connTimeout = 3; // use some sane amount
-		}
-
-		$this->session = '';
-		for ( $i = 0; $i < 5; $i++ ) {
-			$this->session .= mt_rand( 0, 2147483647 );
-		}
-		$this->session = wfBaseConvert( sha1( $this->session ), 16, 36, 31 );
-	}
-
-	protected function doLock( array $paths, $type ) {
-		$status = Status::newGood();
-
-		$pathsToLock = array();
-		// Get locks that need to be acquired (buckets => locks)...
-		foreach ( $paths as $path ) {
-			if ( isset( $this->locksHeld[$path][$type] ) ) {
-				++$this->locksHeld[$path][$type];
-			} elseif ( isset( $this->locksHeld[$path][self::LOCK_EX] ) ) {
-				$this->locksHeld[$path][$type] = 1;
-			} else {
-				$bucket = $this->getBucketFromKey( $path );
-				$pathsToLock[$bucket][] = $path;
-			}
-		}
-
-		$lockedPaths = array(); // files locked in this attempt
-		// Attempt to acquire these locks...
-		foreach ( $pathsToLock as $bucket => $paths ) {
-			// Try to acquire the locks for this bucket
-			$res = $this->doLockingRequestAll( $bucket, $paths, $type );
-			if ( $res === 'cantacquire' ) {
-				// Resources already locked by another process.
-				// Abort and unlock everything we just locked.
-				foreach ( $paths as $path ) {
-					$status->fatal( 'lockmanager-fail-acquirelock', $path );
-				}
-				$status->merge( $this->doUnlock( $lockedPaths, $type ) );
-				return $status;
-			} elseif ( $res !== true ) {
-				// Couldn't contact any servers for this bucket.
-				// Abort and unlock everything we just locked.
-				foreach ( $paths as $path ) {
-					$status->fatal( 'lockmanager-fail-acquirelock', $path );
-				}
-				$status->merge( $this->doUnlock( $lockedPaths, $type ) );
-				return $status;
-			}
-			// Record these locks as active
-			foreach ( $paths as $path ) {
-				$this->locksHeld[$path][$type] = 1; // locked
-			}
-			// Keep track of what locks were made in this attempt
-			$lockedPaths = array_merge( $lockedPaths, $paths );
-		}
-
-		return $status;
-	}
-
-	protected function doUnlock( array $paths, $type ) {
-		$status = Status::newGood();
-
-		foreach ( $paths as $path ) {
-			if ( !isset( $this->locksHeld[$path] ) ) {
-				$status->warning( 'lockmanager-notlocked', $path );
-			} elseif ( !isset( $this->locksHeld[$path][$type] ) ) {
-				$status->warning( 'lockmanager-notlocked', $path );
-			} else {
-				--$this->locksHeld[$path][$type];
-				if ( $this->locksHeld[$path][$type] <= 0 ) {
-					unset( $this->locksHeld[$path][$type] );
-				}
-				if ( !count( $this->locksHeld[$path] ) ) {
-					unset( $this->locksHeld[$path] ); // no SH or EX locks left for key
-				}
-			}
-		}
-
-		// Reference count the locks held and release locks when zero
-		if ( !count( $this->locksHeld ) ) {
-			$status->merge( $this->releaseLocks() );
-		}
-
-		return $status;
-	}
-
-	/**
-	 * Get a connection to a lock server and acquire locks on $paths
-	 *
-	 * @param $lockSrv string
-	 * @param $paths Array
-	 * @param $type integer LockManager::LOCK_EX or LockManager::LOCK_SH
-	 * @return bool Resources able to be locked
-	 */
-	protected function doLockingRequest( $lockSrv, array $paths, $type ) {
-		if ( $type == self::LOCK_SH ) { // reader locks
-			$type = 'SH';
-		} elseif ( $type == self::LOCK_EX ) { // writer locks
-			$type = 'EX';
-		} else {
-			return true; // ok...
-		}
-
-		// Send out the command and get the response...
-		$keys = array_unique( array_map( 'LockManager::sha1Base36', $paths ) );
-		$response = $this->sendCommand( $lockSrv, 'ACQUIRE', $type, $keys );
-
-		return ( $response === 'ACQUIRED' );
-	}
-
-	/**
-	 * Send a command and get back the response
-	 *
-	 * @param $lockSrv string
-	 * @param $action string
-	 * @param $type string
-	 * @param $values Array
-	 * @return string|false
-	 */
-	protected function sendCommand( $lockSrv, $action, $type, $values ) {
-		$conn = $this->getConnection( $lockSrv );
-		if ( !$conn ) {
-			return false; // no connection
-		}
-		$authKey = $this->lockServers[$lockSrv]['authKey'];
-		// Build of the command as a flat string...
-		$values = implode( '|', $values );
-		$key = sha1( $this->session . $action . $type . $values . $authKey );
-		// Send out the command...
-		if ( fwrite( $conn, "{$this->session}:$key:$action:$type:$values\n" ) === false ) {
-			return false;
-		}
-		// Get the response...
-		$response = fgets( $conn );
-		if ( $response === false ) {
-			return false;
-		}
-		return trim( $response );
-	}
-
-	/**
-	 * Attempt to acquire locks with the peers for a bucket
-	 *
-	 * @param $bucket integer
-	 * @param $paths Array List of resource keys to lock
-	 * @param $type integer LockManager::LOCK_EX or LockManager::LOCK_SH
-	 * @return bool|string One of (true, 'cantacquire', 'srverrors')
-	 */
-	protected function doLockingRequestAll( $bucket, array $paths, $type ) {
-		$yesVotes = 0; // locks made on trustable servers
-		$votesLeft = count( $this->srvsByBucket[$bucket] ); // remaining peers
-		$quorum = floor( $votesLeft/2 + 1 ); // simple majority
-		// Get votes for each peer, in order, until we have enough...
-		foreach ( $this->srvsByBucket[$bucket] as $lockSrv ) {
-			// Attempt to acquire the lock on this peer
-			if ( !$this->doLockingRequest( $lockSrv, $paths, $type ) ) {
-				return 'cantacquire'; // vetoed; resource locked
-			}
-			++$yesVotes; // success for this peer
-			if ( $yesVotes >= $quorum ) {
-				return true; // lock obtained
-			}
-			--$votesLeft;
-			$votesNeeded = $quorum - $yesVotes;
-			if ( $votesNeeded > $votesLeft ) {
-				// In "trust cache" mode we don't have to meet the quorum
-				break; // short-circuit
-			}
-		}
-		// At this point, we must not have meet the quorum
-		return 'srverrors'; // not enough votes to ensure correctness
-	}
-
-	/**
-	 * Get (or reuse) a connection to a lock server
-	 *
-	 * @param $lockSrv string
-	 * @return resource
-	 */
-	protected function getConnection( $lockSrv ) {
-		if ( !isset( $this->conns[$lockSrv] ) ) {
-			$cfg = $this->lockServers[$lockSrv];
-			wfSuppressWarnings();
-			$errno = $errstr = '';
-			$conn = fsockopen( $cfg['host'], $cfg['port'], $errno, $errstr, $this->connTimeout );
-			wfRestoreWarnings();
-			if ( $conn === false ) {
-				return null;
-			}
-			$sec = floor( $this->connTimeout );
-			$usec = floor( ( $this->connTimeout - floor( $this->connTimeout ) ) * 1e6 );
-			stream_set_timeout( $conn, $sec, $usec );
-			$this->conns[$lockSrv] = $conn;
-		}
-		return $this->conns[$lockSrv];
-	}
-
-	/**
-	 * Release all locks that this session is holding
-	 *
-	 * @return Status
-	 */
-	protected function releaseLocks() {
-		$status = Status::newGood();
-		foreach ( $this->conns as $lockSrv => $conn ) {
-			$response = $this->sendCommand( $lockSrv, 'RELEASE_ALL', '', array() );
-			if ( $response !== 'RELEASED_ALL' ) {
-				$status->fatal( 'lockmanager-fail-svr-release', $lockSrv );
-			}
-		}
-		return $status;
-	}
-
-	/**
-	 * Get the bucket for resource path.
-	 * This should avoid throwing any exceptions.
-	 *
-	 * @param $path string
-	 * @return integer
-	 */
-	protected function getBucketFromKey( $path ) {
-		$prefix = substr( sha1( $path ), 0, 2 ); // first 2 hex chars (8 bits)
-		return intval( base_convert( $prefix, 16, 10 ) ) % count( $this->srvsByBucket );
-	}
-
-	/**
-	 * Make sure remaining locks get cleared for sanity
-	 */
-	function __destruct() {
-		$this->releaseLocks();
-		foreach ( $this->conns as $conn ) {
-			fclose( $conn );
-		}
-	}
-}