Manage locks using redis servers. More...

Inheritance diagram for RedisLockManager:

Collaboration diagram for RedisLockManager:

[legend]

Public Member Functions
	__construct (array $config)
	Construct a new instance from configuration. More...

	__destruct ()
	Make sure remaining locks get cleared for sanity. More...

Public Member Functions inherited from LockManager
	lock (array $paths, $type=self::LOCK_EX, $timeout=0)
	Lock the resources at the given abstract paths. More...

	lockByType (array $pathsByType, $timeout=0)
	Lock the resources at the given abstract paths. More...

	unlock (array $paths, $type=self::LOCK_EX)
	Unlock the resources at the given abstract paths. More...

	unlockByType (array $pathsByType)
	Unlock the resources at the given abstract paths. More...

Protected Member Functions
	freeLocksOnServer ( $lockSrv, array $pathsByType)
	Get a connection to a lock server and release locks on $paths. More...

	getLocksOnServer ( $lockSrv, array $pathsByType)
	Get a connection to a lock server and acquire locks. More...

	isServerUp ( $lockSrv)
	Check if a lock server is up. More...

	recordKeyForPath ( $path, $type)

	releaseAllLocks ()
	Release all locks that this session is holding. More...

Protected Member Functions inherited from QuorumLockManager
	doLock (array $paths, $type)
	Lock resources with the given keys and lock type. More...

	doLockByType (array $pathsByType)

	doLockingRequestBucket ( $bucket, array $pathsByType)
	Attempt to acquire locks with the peers for a bucket. More...

	doUnlock (array $paths, $type)
	Unlock resources with the given keys and lock type. More...

	doUnlockByType (array $pathsByType)

	doUnlockingRequestBucket ( $bucket, array $pathsByType)
	Attempt to release locks with the peers for a bucket. More...

	getBucketFromPath ( $path)
	Get the bucket for resource path. More...

Protected Member Functions inherited from LockManager
	normalizePathsByType (array $pathsByType)
	Normalize the $paths array by converting LOCK_UW locks into the appropriate type and removing any duplicated paths for each lock type. More...

	sha1Base16Absolute ( $path)
	Get the base 16 SHA-1 of a string, padded to 31 digits. More...

	sha1Base36Absolute ( $path)
	Get the base 36 SHA-1 of a string, padded to 31 digits. More...

Protected Attributes
	$lockServers = array()

array	$lockTypeMap
	Mapping of lock types to the type actually used *. More...

RedisConnectionPool	$redisPool

string	$session = ''
	random UUID * More...

Protected Attributes inherited from QuorumLockManager
array	$degradedBuckets = array()
	Map of degraded buckets *. More...

array	$srvsByBucket = array()
	Map of bucket indexes to peer server lists *. More...

Protected Attributes inherited from LockManager
	$domain

array	$locksHeld = array()
	Map of (resource path => lock type => count) *. More...

	$lockTTL

array	$lockTypeMap
	Mapping of lock types to the type actually used *. More...

Additional Inherited Members
Public Attributes inherited from LockManager
const	LOCK_EX = 3

const	LOCK_SH = 1
	Lock types; stronger locks have higher values. More...

const	LOCK_UW = 2

Detailed Description

Manage locks using redis servers.

Version of LockManager based on using redis 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 redis. A majority of peers must agree for a lock to be acquired.

This class requires Redis 2.6 as it makes use Lua scripts for fast atomic operations.

Since: 1.22

Definition at line 40 of file RedisLockManager.php.

Constructor & Destructor Documentation

◆ __construct()

RedisLockManager::__construct ( array $config )

Construct a new instance from configuration.

Parameters

array

$config

Parameters include:

lockServers : Associative array of server names to "<IP>:<port>" strings.
srvsByBucket : Array of 1-16 consecutive integer keys, starting from 0, each having an odd-numbered list of server names (peers) as values.
redisConfig : Configuration for RedisConnectionPool::__construct().

Exceptions

MWException

Reimplemented from LockManager.

Definition at line 64 of file RedisLockManager.php.

References RedisConnectionPool\singleton(), and wfRandomString().

◆ __destruct()

RedisLockManager::__destruct ( )

Make sure remaining locks get cleared for sanity.

Definition at line 258 of file RedisLockManager.php.

References $count, $path, $type, array(), as, and LockManager\unlockByType().

Member Function Documentation

◆ freeLocksOnServer()

RedisLockManager::freeLocksOnServer	(		$lockSrv,
		array	$pathsByType
	)

protected

Get a connection to a lock server and release locks on $paths.

Subclasses must effectively implement this or releaseAllLocks().

Parameters

string	$lockSrv
array	$pathsByType	Map of LockManager::LOCK_* constants to lists of paths

Returns: Status

Reimplemented from QuorumLockManager.

Definition at line 169 of file RedisLockManager.php.

References $e, $path, $res, $type, are, array(), as, e, in, is(), LockManager\LOCK_SH, Status\newGood(), of, recordKeyForPath(), that, and then.

◆ getLocksOnServer()

RedisLockManager::getLocksOnServer	(		$lockSrv,
		array	$pathsByType
	)

protected

Get a connection to a lock server and acquire locks.

Parameters

string	$lockSrv
array	$pathsByType	Map of LockManager::LOCK_* constants to lists of paths

Returns: Status

Reimplemented from QuorumLockManager.

Definition at line 78 of file RedisLockManager.php.

References $e, $path, $res, $type, addition, are, array(), as, e, in, is(), LockManager\lock(), LockManager\LOCK_SH, Status\newGood(), of, recordKeyForPath(), request, so(), that, then, and type.

◆ isServerUp()

RedisLockManager::isServerUp ( $lockSrv )

protected

Check if a lock server is up.

This should process cache results to reduce RTT.

Parameters

string $lockSrv

Returns: bool

Reimplemented from QuorumLockManager.

Definition at line 241 of file RedisLockManager.php.

◆ recordKeyForPath()

RedisLockManager::recordKeyForPath	(	$path,
		$type
	)

protected

Parameters

string	$path
string	$type	One of (EX,SH)

Returns: string

Definition at line 250 of file RedisLockManager.php.

References $path, array(), and LockManager\sha1Base36Absolute().

Referenced by freeLocksOnServer(), and getLocksOnServer().

◆ releaseAllLocks()

RedisLockManager::releaseAllLocks ( )

protected

Release all locks that this session is holding.

Subclasses must effectively implement this or freeLocksOnServer().

Returns: Status

Reimplemented from QuorumLockManager.

Definition at line 237 of file RedisLockManager.php.

References Status\newGood().

Member Data Documentation

◆ $lockServers

RedisLockManager::$lockServers = array()

protected

Definition at line 50 of file RedisLockManager.php.

◆ $lockTypeMap

array RedisLockManager::$lockTypeMap

protected

Initial value:

= array(
        self::LOCK_SH => self::LOCK_SH,
        self::LOCK_UW => self::LOCK_SH,
        self::LOCK_EX => self::LOCK_EX
    )

Mapping of lock types to the type actually used *.

Definition at line 41 of file RedisLockManager.php.

◆ $redisPool

RedisConnectionPool RedisLockManager::$redisPool

protected

Definition at line 47 of file RedisLockManager.php.

◆ $session

string RedisLockManager::$session = ''

protected

random UUID *

Definition at line 52 of file RedisLockManager.php.

The documentation for this class was generated from the following file:

includes/filebackend/lockmanager/RedisLockManager.php

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

◆ __destruct()

Member Function Documentation

◆ freeLocksOnServer()

◆ getLocksOnServer()

◆ isServerUp()

◆ recordKeyForPath()

◆ releaseAllLocks()

Member Data Documentation

◆ $lockServers

◆ $lockTypeMap

◆ $redisPool

◆ $session