Service for storing and loading Content objects. More...

Inheritance diagram for MediaWiki\Storage\SqlBlobStore:

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Collaboration diagram for MediaWiki\Storage\SqlBlobStore:

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Public Member Functions
	__construct (ILoadBalancer $dbLoadBalancer, ExternalStoreAccess $extStoreAccess, WANObjectCache $cache, $dbDomain=false)

	compressData (&$blob)
	If $wgCompressRevisions is enabled, we will compress data.

	decompressData ( $blob, array $blobFlags)
	Re-converts revision text according to its flags.

	expandBlob ( $raw, $flags, $cacheKey=null)
	Expand a raw data blob according to the flags given.

	getBlob ( $blobAddress, $queryFlags=0)
	Retrieve a blob, given an address.

	getBlobBatch ( $blobAddresses, $queryFlags=0)
	A batched version of BlobStore::getBlob.

	getCacheExpiry ()

	getCompressBlobs ()

	getLegacyEncoding ()

	getLegacyEncodingConversionLang ()

	getTextIdFromAddress ( $address)
	Returns an ID corresponding to the old_id field in the text table, corresponding to the given $address.

	getUseExternalStore ()

	isReadOnly ()
	Check if the blob metadata or backing blob data store is read-only.

	setCacheExpiry ( $cacheExpiry)

	setCompressBlobs ( $compressBlobs)

	setLegacyEncoding ( $legacyEncoding)
	Set the legacy encoding to assume for blobs that do not have the utf-8 flag set.

	setUseExternalStore ( $useExternalStore)

	storeBlob ( $data, $hints=[])
	Stores an arbitrary blob of data and returns an address that can be used with getBlob() to retrieve the same blob of data,.

Static Public Member Functions
static	makeAddressFromTextId ( $id)
	Returns an address referring to content stored in the text table row with the given ID.

static	splitBlobAddress ( $address)
	Splits a blob address into three parts: the schema, the ID, and parameters/flags.

Public Attributes
const	TEXT_CACHE_GROUP = 'revisiontext:10'

Public Attributes inherited from IDBAccessObject
const	READ_LOCKING = self::READ_LATEST \| 2
	Constants for object loading bitfield flags (higher => higher QoS)

const	READ_NONE = -1

Public Attributes inherited from MediaWiki\Storage\BlobStore
const	DESIGNATION_HINT = 'designation'
	Hint key for use with storeBlob, indicating the general role the block takes in the application.

const	FORMAT_HINT = 'cont_format'
	Hint key for use with storeBlob, indicating the serialization format used to create the blob, as a MIME type.

const	MODEL_HINT = 'cont_model'
	Hint key for use with storeBlob, indicating the model of the content encoded in the given blob.

const	PAGE_HINT = 'page_id'
	Hint key for use with storeBlob, indicating the page the blob is associated with.

const	PARENT_HINT = 'rev_parent_id'
	Hint key for use with storeBlob, indicating the parent revision of the revision the blob is associated with.

const	REVISION_HINT = 'rev_id'
	Hint key for use with storeBlob, indicating the revision the blob is associated with.

const	ROLE_HINT = 'role_name'
	Hint key for use with storeBlob, indicating the slot the blob is associated with.

const	SHA1_HINT = 'cont_sha1'
	Hint key for use with storeBlob, providing the SHA1 hash of the blob as passed to the method.

Private Member Functions
	fetchBlobs ( $blobAddresses, $queryFlags)
	MCR migration note: this corresponds to Revision::fetchText.

	getCacheKey ( $blobAddress)
	Get a cache key for a given Blob address.

	getCacheTTL ()
	Get the text cache TTL.

	getDBConnection ( $index)

	getDBLoadBalancer ()

Private Attributes
WANObjectCache	$cache

int	$cacheExpiry = 604800

bool	$compressBlobs = false

string bool	$dbDomain
	DB domain ID of a wiki or false for the local one.

ILoadBalancer	$dbLoadBalancer

ExternalStoreAccess	$extStoreAccess

bool string	$legacyEncoding = false

boolean	$useExternalStore = false

Detailed Description

Service for storing and loading Content objects.

Since: 1.31

Note: This was written to act as a drop-in replacement for the corresponding static methods in Revision.

Definition at line 51 of file SqlBlobStore.php.

Constructor & Destructor Documentation

◆ __construct()

MediaWiki\Storage\SqlBlobStore::__construct	(	ILoadBalancer	$dbLoadBalancer,
		ExternalStoreAccess	$extStoreAccess,
		WANObjectCache	$cache,
			$dbDomain = `false`
	)

Parameters

ILoadBalancer	$dbLoadBalancer	A load balancer for acquiring database connections
ExternalStoreAccess	$extStoreAccess	Access layer for external storage
WANObjectCache	$cache	A cache manager for caching blobs. This can be the local wiki's default instance even if $dbDomain refers to a different wiki, since makeGlobalKey() is used to construct a key that allows cached blobs from the same database to be re-used between wikis. For example, wiki A and wiki B will use the same cache keys for blobs fetched from wiki C, regardless of the wiki-specific default key space.
bool \| string	$dbDomain	The ID of the target wiki database. Use false for the local wiki.

Definition at line 107 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$cache, MediaWiki\Storage\SqlBlobStore\$dbDomain, MediaWiki\Storage\SqlBlobStore\$dbLoadBalancer, and MediaWiki\Storage\SqlBlobStore\$extStoreAccess.

Member Function Documentation

◆ compressData()

MediaWiki\Storage\SqlBlobStore::compressData ( & $blob )

If $wgCompressRevisions is enabled, we will compress data.

The input string is modified in place. Return value is the flags field: contains 'gzip' if the data is compressed, and 'utf-8' if we're saving in UTF-8 mode.

MCR migration note: this replaces Revision::compressRevisionText

Note: direct use is deprecated!

Todo:: make this private, there should be no need to use this method outside this class.

Parameters

mixed &$blob Reference to a text

Returns: string

Definition at line 535 of file SqlBlobStore.php.

References $blob, wfDebug(), and wfLogWarning().

Referenced by MediaWiki\Storage\SqlBlobStore\storeBlob().

◆ decompressData()

MediaWiki\Storage\SqlBlobStore::decompressData	(		$blob,
		array	$blobFlags
	)

Re-converts revision text according to its flags.

MCR migration note: this replaces Revision::decompressRevisionText

Note: direct use is deprecated, use getBlob() or SlotRecord::getContent() instead.

Todo:: make this private, there should be no need to use this method outside this class.

Parameters

string	$blob	Blob in compressed/encoded form.
array	$blobFlags	Compression flags, such as 'gzip'. Note that not including 'utf-8' in $blobFlags will cause the data to be decoded according to the legacy encoding specified via setLegacyEncoding.

Returns: string|bool Decompressed text, or false on failure

Definition at line 575 of file SqlBlobStore.php.

References $blob, unserialize(), and wfWarn().

Referenced by MediaWiki\Storage\SqlBlobStore\expandBlob().

◆ expandBlob()

MediaWiki\Storage\SqlBlobStore::expandBlob	(	$raw,
		$flags,
		$cacheKey = `null`
	)

Expand a raw data blob according to the flags given.

MCR migration note: this replaces Revision::getRevisionText

Note: direct use is deprecated, use getBlob() or SlotRecord::getContent() instead.

Todo:: make this private, there should be no need to use this method outside this class.

Parameters

string	$raw	The raw blob data, to be processed according to $flags. May be the blob itself, or the blob compressed, or just the address of the actual blob, depending on $flags.
string \| string[]	$flags	Blob flags, such as 'external' or 'gzip'. Note that not including 'utf-8' in $flags will cause the data to be decoded according to the legacy encoding specified via setLegacyEncoding.
string \| null	$cacheKey	A blob address for use in the cache key. If not given, caching is disabled.

Returns: false|string The expanded blob or false on failure

Definition at line 483 of file SqlBlobStore.php.

References $blob, MediaWiki\Storage\SqlBlobStore\decompressData(), MediaWiki\Storage\SqlBlobStore\getCacheKey(), MediaWiki\Storage\SqlBlobStore\getCacheTTL(), and MediaWiki\Storage\SqlBlobStore\TEXT_CACHE_GROUP.

Referenced by MediaWiki\Storage\SqlBlobStore\fetchBlobs().

◆ fetchBlobs()

MediaWiki\Storage\SqlBlobStore::fetchBlobs	(	$blobAddresses,
		$queryFlags
	)

private

MCR migration note: this corresponds to Revision::fetchText.

Parameters

string[]	$blobAddresses
int	$queryFlags

Exceptions

BlobAccessException

Returns: array [ $result, $errors ] A map of blob addresses to successfully fetched blobs or false if fetch failed, plus and array of errors

Definition at line 360 of file SqlBlobStore.php.

References $blob, MediaWiki\Storage\SqlBlobStore\expandBlob(), MediaWiki\Storage\SqlBlobStore\getDBConnection(), and MediaWiki\Storage\SqlBlobStore\splitBlobAddress().

Referenced by MediaWiki\Storage\SqlBlobStore\getBlob(), and MediaWiki\Storage\SqlBlobStore\getBlobBatch().

◆ getBlob()

MediaWiki\Storage\SqlBlobStore::getBlob	(	$blobAddress,
		$queryFlags = `0`
	)

Retrieve a blob, given an address.

Currently hardcoded to the 'text' table storage engine.

MCR migration note: this replaces Revision::loadText

Parameters

string	$blobAddress
int	$queryFlags

Exceptions

BlobAccessException

Returns: string

Implements MediaWiki\Storage\BlobStore.

Definition at line 277 of file SqlBlobStore.php.

References $blob, MediaWiki\Storage\SqlBlobStore\fetchBlobs(), MediaWiki\Storage\SqlBlobStore\getCacheKey(), MediaWiki\Storage\SqlBlobStore\getCacheTTL(), and MediaWiki\Storage\SqlBlobStore\TEXT_CACHE_GROUP.

◆ getBlobBatch()

MediaWiki\Storage\SqlBlobStore::getBlobBatch	(	$blobAddresses,
		$queryFlags = `0`
	)

A batched version of BlobStore::getBlob.

Parameters

string[]	$blobAddresses	An array of blob addresses.
int	$queryFlags	See IDBAccessObject.

Exceptions

BlobAccessException

Returns: StatusValue A status with a map of blobAddress => binary blob data or null if fetching the blob has failed. Fetch failures errors are the warnings in the status object.

Since: 1.34

Implements MediaWiki\Storage\BlobStore.

Definition at line 313 of file SqlBlobStore.php.

References $blob, MediaWiki\Storage\SqlBlobStore\fetchBlobs(), MediaWiki\Storage\SqlBlobStore\getCacheKey(), MediaWiki\Storage\SqlBlobStore\getCacheTTL(), and MediaWiki\Storage\SqlBlobStore\TEXT_CACHE_GROUP.

◆ getCacheExpiry()

MediaWiki\Storage\SqlBlobStore::getCacheExpiry ( )

Returns: int time for which blobs can be cached, in seconds

Definition at line 122 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$cacheExpiry.

◆ getCacheKey()

MediaWiki\Storage\SqlBlobStore::getCacheKey ( $blobAddress )

private

Get a cache key for a given Blob address.

The cache key is constructed in a way that allows cached blobs from the same database to be re-used between wikis. For example, wiki A and wiki B will use the same cache keys for blobs fetched from wiki C.

Parameters

string $blobAddress

Returns: string

Definition at line 456 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\expandBlob(), MediaWiki\Storage\SqlBlobStore\getBlob(), and MediaWiki\Storage\SqlBlobStore\getBlobBatch().

◆ getCacheTTL()

MediaWiki\Storage\SqlBlobStore::getCacheTTL ( )

private

Get the text cache TTL.

MCR migration note: this replaces Revision::getCacheTTL

Returns: int

Definition at line 633 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\expandBlob(), MediaWiki\Storage\SqlBlobStore\getBlob(), and MediaWiki\Storage\SqlBlobStore\getBlobBatch().

◆ getCompressBlobs()

MediaWiki\Storage\SqlBlobStore::getCompressBlobs ( )

Returns: bool whether blobs should be compressed for storage

Definition at line 138 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$compressBlobs.

◆ getDBConnection()

MediaWiki\Storage\SqlBlobStore::getDBConnection ( $index )

private

Parameters

int $index A database index, like DB_MASTER or DB_REPLICA

Returns: IDatabase

Definition at line 208 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\getDBLoadBalancer().

Referenced by MediaWiki\Storage\SqlBlobStore\fetchBlobs(), and MediaWiki\Storage\SqlBlobStore\storeBlob().

◆ getDBLoadBalancer()

MediaWiki\Storage\SqlBlobStore::getDBLoadBalancer ( )

private

Returns: ILoadBalancer

Definition at line 199 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$dbLoadBalancer.

Referenced by MediaWiki\Storage\SqlBlobStore\getDBConnection(), and MediaWiki\Storage\SqlBlobStore\isReadOnly().

◆ getLegacyEncoding()

MediaWiki\Storage\SqlBlobStore::getLegacyEncoding ( )

Returns: false|string The legacy encoding to assume for blobs that are not marked as utf8. False means handling of legacy encoding is disabled, and utf8 assumed.

Definition at line 153 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$legacyEncoding.

◆ getLegacyEncodingConversionLang()

MediaWiki\Storage\SqlBlobStore::getLegacyEncodingConversionLang ( )

Deprecated:: since 1.34 No longer needed

Returns: null

Definition at line 161 of file SqlBlobStore.php.

References wfDeprecated().

◆ getTextIdFromAddress()

MediaWiki\Storage\SqlBlobStore::getTextIdFromAddress ( $address )

Returns an ID corresponding to the old_id field in the text table, corresponding to the given $address.

Currently, $address must start with 'tt:' followed by a decimal integer representing the old_id; if $address does not start with 'tt:', null is returned. However, the implementation may change to insert rows into the text table on the fly. This implies that this method cannot be static.

Note: This method exists for use with the text table based storage schema. It should not be assumed that is will function with all future kinds of content addresses.

Deprecated:: since 1.31, so don't assume that all blob addresses refer to a row in the text table. This method should become private once the relevant refactoring in WikiPage is complete.

Parameters

string $address

Returns: int|null

Definition at line 666 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\splitBlobAddress().

◆ getUseExternalStore()

MediaWiki\Storage\SqlBlobStore::getUseExternalStore ( )

Returns: bool Whether to use the ExternalStore mechanism for storing blobs.

Definition at line 183 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$useExternalStore.

◆ isReadOnly()

MediaWiki\Storage\SqlBlobStore::isReadOnly ( )

Check if the blob metadata or backing blob data store is read-only.

Returns: bool

Implements MediaWiki\Storage\BlobStore.

Definition at line 720 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\getDBLoadBalancer().

◆ makeAddressFromTextId()

static MediaWiki\Storage\SqlBlobStore::makeAddressFromTextId ( $id )

static

Returns an address referring to content stored in the text table row with the given ID.

The address schema for blobs stored in the text table is "tt:" followed by an integer that corresponds to a value of the old_id field.

Deprecated:: since 1.31. This method should become private once the relevant refactoring in WikiPage is complete.

Parameters

int $id

Returns: string

Definition at line 694 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\storeBlob().

◆ setCacheExpiry()

MediaWiki\Storage\SqlBlobStore::setCacheExpiry ( $cacheExpiry )

Parameters

int $cacheExpiry time for which blobs can be cached, in seconds

Definition at line 129 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$cacheExpiry.

◆ setCompressBlobs()

MediaWiki\Storage\SqlBlobStore::setCompressBlobs ( $compressBlobs )

Parameters

bool $compressBlobs whether blobs should be compressed for storage

Definition at line 145 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$compressBlobs.

◆ setLegacyEncoding()

MediaWiki\Storage\SqlBlobStore::setLegacyEncoding ( $legacyEncoding )

Set the legacy encoding to assume for blobs that do not have the utf-8 flag set.

Note: The second parameter, Language $language, was removed in 1.34.

Parameters

string $legacyEncoding The legacy encoding to assume for blobs that are not marked as utf8.

Definition at line 174 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$legacyEncoding.

◆ setUseExternalStore()

MediaWiki\Storage\SqlBlobStore::setUseExternalStore ( $useExternalStore )

Parameters

bool $useExternalStore Whether to use the ExternalStore mechanism for storing blobs.

Definition at line 190 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\$useExternalStore.

◆ splitBlobAddress()

static MediaWiki\Storage\SqlBlobStore::splitBlobAddress ( $address )

static

Splits a blob address into three parts: the schema, the ID, and parameters/flags.

Since: 1.33

Parameters

string $address

Exceptions

InvalidArgumentException

Returns: array [ $schema, $id, $parameters ], with $parameters being an assoc array.

Definition at line 708 of file SqlBlobStore.php.

References wfCgiToArray().

Referenced by MediaWiki\Storage\SqlBlobStore\fetchBlobs(), and MediaWiki\Storage\SqlBlobStore\getTextIdFromAddress().

◆ storeBlob()

MediaWiki\Storage\SqlBlobStore::storeBlob	(	$data,
		$hints = `[]`
	)

Stores an arbitrary blob of data and returns an address that can be used with getBlob() to retrieve the same blob of data,.

Parameters

string	$data
array	$hints	An array of hints.

Exceptions

BlobAccessException

Returns: string an address that can be used with getBlob() to retrieve the data.

Implements MediaWiki\Storage\BlobStore.

Definition at line 223 of file SqlBlobStore.php.

References MediaWiki\Storage\SqlBlobStore\compressData(), DB_MASTER, MediaWiki\Storage\SqlBlobStore\getDBConnection(), and MediaWiki\Storage\SqlBlobStore\makeAddressFromTextId().

Member Data Documentation

◆ $cache

WANObjectCache MediaWiki\Storage\SqlBlobStore::$cache

private

Definition at line 69 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\__construct().

◆ $cacheExpiry

int MediaWiki\Storage\SqlBlobStore::$cacheExpiry = 604800

private

Definition at line 79 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\getCacheExpiry(), and MediaWiki\Storage\SqlBlobStore\setCacheExpiry().

◆ $compressBlobs

bool MediaWiki\Storage\SqlBlobStore::$compressBlobs = false

private

Definition at line 84 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\getCompressBlobs(), and MediaWiki\Storage\SqlBlobStore\setCompressBlobs().

◆ $dbDomain

string bool MediaWiki\Storage\SqlBlobStore::$dbDomain

private

DB domain ID of a wiki or false for the local one.

Definition at line 74 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\__construct().

◆ $dbLoadBalancer

ILoadBalancer MediaWiki\Storage\SqlBlobStore::$dbLoadBalancer

private

Definition at line 59 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\__construct(), and MediaWiki\Storage\SqlBlobStore\getDBLoadBalancer().

◆ $extStoreAccess

ExternalStoreAccess MediaWiki\Storage\SqlBlobStore::$extStoreAccess

private

Definition at line 64 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\__construct().

◆ $legacyEncoding

bool string MediaWiki\Storage\SqlBlobStore::$legacyEncoding = false

private

Definition at line 89 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\getLegacyEncoding(), and MediaWiki\Storage\SqlBlobStore\setLegacyEncoding().

◆ $useExternalStore

boolean MediaWiki\Storage\SqlBlobStore::$useExternalStore = false

private

Definition at line 94 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\getUseExternalStore(), and MediaWiki\Storage\SqlBlobStore\setUseExternalStore().

◆ TEXT_CACHE_GROUP

const MediaWiki\Storage\SqlBlobStore::TEXT_CACHE_GROUP = 'revisiontext:10'

Definition at line 54 of file SqlBlobStore.php.

Referenced by MediaWiki\Storage\SqlBlobStore\expandBlob(), MediaWiki\Storage\SqlBlobStore\getBlob(), and MediaWiki\Storage\SqlBlobStore\getBlobBatch().

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

includes/Storage/SqlBlobStore.php

Public Member Functions

Static Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ compressData()

◆ decompressData()

◆ expandBlob()

◆ fetchBlobs()

◆ getBlob()

◆ getBlobBatch()

◆ getCacheExpiry()

◆ getCacheKey()

◆ getCacheTTL()

◆ getCompressBlobs()

◆ getDBConnection()

◆ getDBLoadBalancer()

◆ getLegacyEncoding()

◆ getLegacyEncodingConversionLang()

◆ getTextIdFromAddress()

◆ getUseExternalStore()

◆ isReadOnly()

◆ makeAddressFromTextId()

◆ setCacheExpiry()

◆ setCompressBlobs()

◆ setLegacyEncoding()

◆ setUseExternalStore()

◆ splitBlobAddress()

◆ storeBlob()

Member Data Documentation

◆ $cache

◆ $cacheExpiry

◆ $compressBlobs

◆ $dbDomain

◆ $dbLoadBalancer

◆ $extStoreAccess

◆ $legacyEncoding

◆ $useExternalStore

◆ TEXT_CACHE_GROUP