MediaWiki  1.27.2
RedisBagOStuff Class Reference

Redis-based caching module for redis server >= 2.6.12. More...

Inheritance diagram for RedisBagOStuff:
Collaboration diagram for RedisBagOStuff:

Public Member Functions

 __construct ($params)
 Construct a RedisBagOStuff object. More...
 
 add ($key, $value, $expiry=0)
 
 delete ($key)
 
 getMulti (array $keys, $flags=0)
 
 incr ($key, $value=1)
 Non-atomic implementation of incr(). More...
 
 logRequest ($method, $key, $server, $result)
 Send information about a single request to the debug log. More...
 
 modifySimpleRelayEvent (array $event)
 
 set ($key, $value, $expiry=0, $flags=0)
 
 setMulti (array $data, $expiry=0)
 
- Public Member Functions inherited from BagOStuff
 __construct (array $params=[])
 $params include: More...
 
 add ($key, $value, $exptime=0)
 
 clearLastError ()
 Clear the "last error" registry. More...
 
 decr ($key, $value=1)
 Decrease stored value of $key by $value while preserving its TTL. More...
 
 delete ($key)
 Delete an item. More...
 
 deleteObjectsExpiringBefore ($date, $progressCallback=false)
 Delete all objects expiring before a certain date. More...
 
 get ($key, $flags=0, $oldFlags=null)
 Get an item with the given key. More...
 
 getLastError ()
 Get the "last error" registered; clearLastError() should be called manually. More...
 
 getMulti (array $keys, $flags=0)
 Get an associative array containing the item for each of the keys that have items. More...
 
 getScopedLock ($key, $timeout=6, $expiry=30, $rclass= '')
 Get a lightweight exclusive self-unlocking lock. More...
 
 getWithSetCallback ($key, $ttl, $callback, $flags=0)
 Get an item with the given key, regenerating and setting it if not found. More...
 
 incr ($key, $value=1)
 Increase stored value of $key by $value while preserving its TTL. More...
 
 incrWithInit ($key, $ttl, $value=1, $init=1)
 Increase stored value of $key by $value while preserving its TTL. More...
 
 lock ($key, $timeout=6, $expiry=6, $rclass= '')
 Acquire an advisory lock on a key string. More...
 
 makeGlobalKey ()
 Make a global cache key. More...
 
 makeKey ()
 Make a cache key, scoped to this instance's keyspace. More...
 
 makeKeyInternal ($keyspace, $args)
 Construct a cache key. More...
 
 merge ($key, $callback, $exptime=0, $attempts=10, $flags=0)
 Merge changes into the existing cache value (possibly creating a new one). More...
 
 modifySimpleRelayEvent (array $event)
 Modify a cache update operation array for EventRelayer::notify() More...
 
 set ($key, $value, $exptime=0, $flags=0)
 Set an item. More...
 
 setDebug ($bool)
 
 setLogger (LoggerInterface $logger)
 
 setMulti (array $data, $exptime=0)
 Batch insertion. More...
 
 unlock ($key)
 Release an advisory lock on a key string. More...
 

Protected Member Functions

 doGet ($key, $flags=0)
 
 getConnection ($key)
 Get a Redis object with a connection suitable for fetching the specified key. More...
 
 getMasterLinkStatus (RedisConnRef $conn)
 Check the master link status of a Redis server that is configured as a slave. More...
 
 handleException (RedisConnRef $conn, $e)
 The redis extension throws an exception in response to various read, write and protocol errors. More...
 
 logError ($msg)
 Log a fatal error. More...
 
 serialize ($data)
 
 unserialize ($data)
 
- Protected Member Functions inherited from BagOStuff
 cas ($casToken, $key, $value, $exptime=0)
 Check and set an item. More...
 
 convertExpiry ($exptime)
 Convert an optionally relative time to an absolute time. More...
 
 convertToRelative ($exptime)
 Convert an optionally absolute expiry time to a relative time. More...
 
 debug ($text)
 
 doGet ($key, $flags=0)
 
 getWithToken ($key, &$casToken, $flags=0)
 
 isInteger ($value)
 Check if a value is an integer. More...
 
 mergeViaCas ($key, $callback, $exptime=0, $attempts=10)
 
 mergeViaLock ($key, $callback, $exptime=0, $attempts=10, $flags=0)
 
 setLastError ($err)
 Set the "last error" registry. More...
 

Protected Attributes

bool $automaticFailover
 
RedisConnectionPool $redisPool
 
array $servers
 List of server names. More...
 
array $serverTagMap
 Map of (tag => server name) More...
 
- Protected Attributes inherited from BagOStuff
callback null $asyncHandler
 
string $keyspace = 'local'
 
integer $lastError = self::ERR_NONE
 
array[] $locks = []
 Lock tracking. More...
 
LoggerInterface $logger
 

Additional Inherited Members

- Public Attributes inherited from BagOStuff
const ERR_NO_RESPONSE = 1
 
const ERR_NONE = 0
 Possible values for getLastError() More...
 
const ERR_UNEXPECTED = 3
 
const ERR_UNREACHABLE = 2
 
const READ_LATEST = 1
 Bitfield constants for get()/getMulti() More...
 
const READ_VERIFIED = 2
 
const WRITE_CACHE_ONLY = 2
 
const WRITE_SYNC = 1
 Bitfield constants for set()/merge() More...
 
- Public Attributes inherited from IExpiringStore
const TTL_DAY = 86400
 
const TTL_HOUR = 3600
 
const TTL_INDEFINITE = 0
 
const TTL_MINUTE = 60
 
const TTL_MONTH = 2592000
 
const TTL_WEEK = 604800
 
const TTL_YEAR = 31536000
 

Detailed Description

Redis-based caching module for redis server >= 2.6.12.

Note
: avoid use of Redis::MULTI transactions for twemproxy support

Definition at line 28 of file RedisBagOStuff.php.

Constructor & Destructor Documentation

RedisBagOStuff::__construct (   $params)

Construct a RedisBagOStuff object.

Parameters are:

  • servers: An array of server names. A server name may be a hostname, a hostname/port combination or the absolute path of a UNIX socket. If a hostname is specified but no port, the standard port number 6379 will be used. Arrays keys can be used to specify the tag to hash on in place of the host/port. Required.
  • connectTimeout: The timeout for new connections, in seconds. Optional, default is 1 second.
  • persistent: Set this to true to allow connections to persist across multiple web requests. False by default.
  • password: The authentication password, will be sent to Redis in clear text. Optional, if it is unspecified, no AUTH command will be sent.
  • automaticFailover: If this is false, then each key will be mapped to a single server, and if that server is down, any requests for that key will fail. If this is true, a connection failure will cause the client to immediately try the next server in the list (as determined by a consistent hashing algorithm). True by default. This has the potential to create consistency issues if a server is slow enough to flap, for example if it is in swap death.
    Parameters
    array$params

Definition at line 66 of file RedisBagOStuff.php.

References $key, $params, as, servers, and RedisConnectionPool\singleton().

Member Function Documentation

RedisBagOStuff::add (   $key,
  $value,
  $expiry = 0 
)
RedisBagOStuff::delete (   $key)

Definition at line 127 of file RedisBagOStuff.php.

References $e, $key, getConnection(), handleException(), list, and logRequest().

RedisBagOStuff::doGet (   $key,
  $flags = 0 
)
protected

Definition at line 88 of file RedisBagOStuff.php.

References $e, $key, $value, getConnection(), handleException(), list, logRequest(), and unserialize().

RedisBagOStuff::getConnection (   $key)
protected

Get a Redis object with a connection suitable for fetching the specified key.

Parameters
string$key
Returns
array (server, RedisConnRef) or (false, false)

Definition at line 321 of file RedisBagOStuff.php.

References $e, $key, $tag, ArrayUtils\consistentHashSort(), BagOStuff\ERR_UNREACHABLE, false, getMasterLinkStatus(), handleException(), servers, and BagOStuff\setLastError().

Referenced by add(), delete(), doGet(), getMulti(), incr(), set(), and setMulti().

RedisBagOStuff::getMasterLinkStatus ( RedisConnRef  $conn)
protected

Check the master link status of a Redis server that is configured as a slave.

Parameters
RedisConnRef$conn
Returns
string|null Master link status (either 'up' or 'down'), or null if the server is not a slave.

Definition at line 373 of file RedisBagOStuff.php.

Referenced by getConnection().

RedisBagOStuff::getMulti ( array  $keys,
  $flags = 0 
)
RedisBagOStuff::handleException ( RedisConnRef  $conn,
  $e 
)
protected

The redis extension throws an exception in response to various read, write and protocol errors.

Sometimes it also closes the connection, sometimes not. The safest response for us is to explicitly destroy the connection object and let it be reopened during the next request.

Parameters
RedisConnRef$conn
Exception$e

Definition at line 396 of file RedisBagOStuff.php.

References $e, BagOStuff\ERR_UNEXPECTED, and BagOStuff\setLastError().

Referenced by add(), delete(), doGet(), getConnection(), getMulti(), incr(), set(), and setMulti().

RedisBagOStuff::incr (   $key,
  $value = 1 
)

Non-atomic implementation of incr().

Probably all callers actually want incr() to atomically initialise values to zero if they don't exist, as provided by the Redis INCR command. But we are constrained by the memcached-like interface to return null in that case. Once the key exists, further increments are atomic.

Parameters
string$keyKey to increase
int$valueValue to add to $key (Default 1)
Returns
int|bool New value or false on failure

Definition at line 270 of file RedisBagOStuff.php.

References $e, $key, $value, getConnection(), handleException(), list, and logRequest().

RedisBagOStuff::logError (   $msg)
protected

Log a fatal error.

Parameters
string$msg

Definition at line 384 of file RedisBagOStuff.php.

RedisBagOStuff::logRequest (   $method,
  $key,
  $server,
  $result 
)

Send information about a single request to the debug log.

Parameters
string$method
string$key
string$server
bool$result

Definition at line 408 of file RedisBagOStuff.php.

References BagOStuff\debug().

Referenced by add(), delete(), doGet(), incr(), and set().

RedisBagOStuff::modifySimpleRelayEvent ( array  $event)

Definition at line 290 of file RedisBagOStuff.php.

References serialize().

RedisBagOStuff::serialize (   $data)
protected
Parameters
mixed$data
Returns
string

Definition at line 302 of file RedisBagOStuff.php.

Referenced by add(), modifySimpleRelayEvent(), set(), and setMulti().

RedisBagOStuff::set (   $key,
  $value,
  $expiry = 0,
  $flags = 0 
)
RedisBagOStuff::setMulti ( array  $data,
  $expiry = 0 
)
Parameters
array$data
int$expiry
Returns
bool

Definition at line 189 of file RedisBagOStuff.php.

References $e, $key, $value, as, BagOStuff\convertToRelative(), BagOStuff\debug(), getConnection(), handleException(), list, and serialize().

RedisBagOStuff::unserialize (   $data)
protected
Parameters
string$data
Returns
mixed

Definition at line 312 of file RedisBagOStuff.php.

Referenced by doGet(), and getMulti().

Member Data Documentation

bool RedisBagOStuff::$automaticFailover
protected

Definition at line 36 of file RedisBagOStuff.php.

RedisConnectionPool RedisBagOStuff::$redisPool
protected

Definition at line 30 of file RedisBagOStuff.php.

array RedisBagOStuff::$servers
protected

List of server names.

Definition at line 32 of file RedisBagOStuff.php.

array RedisBagOStuff::$serverTagMap
protected

Map of (tag => server name)

Definition at line 34 of file RedisBagOStuff.php.


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