Service for storing and loading Content objects representing revision data blobs. More...

Collaboration diagram for MediaWiki\Storage\SqlBlobStore:

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

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

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

	expandBlob ( $raw, $flags, $blobAddress=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 ()

	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 (int $cacheExpiry)

	setCompressBlobs ( $compressBlobs)

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

	setUseExternalStore (bool $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	explodeFlags (string $flagsString)
	Split a comma-separated old_flags value into its constituent parts.

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	DEFAULT_TTL = 7 * 24 * 3600

const	TEXT_CACHE_GROUP = 'revisiontext:10'

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	IMAGE_HINT = 'img_name'
	Hint key for an image name.

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.

Detailed Description

Service for storing and loading Content objects representing revision data blobs.

Since: 1.31

Note: This was written to act as a drop-in replacement for the corresponding static methods in the old Revision class (which was later removed in 1.37).

Definition at line 50 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 109 of file SqlBlobStore.php.

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 replaced Revision::compressRevisionText

Note: direct use is deprecated!

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

Parameters

string &$blob

Returns: string

Definition at line 602 of file SqlBlobStore.php.

References wfDebug(), and wfLogWarning().

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

◆ decompressData()

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

Re-converts revision text according to its flags.

MCR migration note: this replaced 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 642 of file SqlBlobStore.php.

References HistoryBlobUtils\unserialize(), and wfWarn().

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

◆ expandBlob()

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

Expand a raw data blob according to the flags given.

MCR migration note: this replaced 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	$blobAddress	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

Exceptions

BlobAccessException

Definition at line 545 of file SqlBlobStore.php.

References $url, MediaWiki\Storage\SqlBlobStore\decompressData(), MediaWiki\Storage\SqlBlobStore\explodeFlags(), and getCacheKey().

◆ explodeFlags()

static MediaWiki\Storage\SqlBlobStore::explodeFlags ( string $flagsString )

static

Split a comma-separated old_flags value into its constituent parts.

Parameters

string $flagsString

Returns: array

Definition at line 769 of file SqlBlobStore.php.

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

◆ 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 replaced Revision::loadText

Parameters

string	$blobAddress
int	$queryFlags

Exceptions

BlobAccessException

Returns: string

Implements MediaWiki\Storage\BlobStore.

Definition at line 255 of file SqlBlobStore.php.

References getCacheKey().

◆ 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 298 of file SqlBlobStore.php.

◆ getCacheExpiry()

MediaWiki\Storage\SqlBlobStore::getCacheExpiry ( )

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

Definition at line 124 of file SqlBlobStore.php.

◆ getCompressBlobs()

MediaWiki\Storage\SqlBlobStore::getCompressBlobs ( )

Returns: bool Whether blobs should be compressed for storage

Definition at line 138 of file SqlBlobStore.php.

◆ 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.

◆ 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 730 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 172 of file SqlBlobStore.php.

◆ 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 794 of file SqlBlobStore.php.

◆ 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.

Access: internal

Note: This method should not be used by regular application logic. It is public so maintenance scripts can use it for bulk operations on the text table.

Parameters

int $id

Returns: string

Definition at line 759 of file SqlBlobStore.php.

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

◆ setCacheExpiry()

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

Parameters

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

Definition at line 131 of file SqlBlobStore.php.

◆ setCompressBlobs()

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

Parameters

bool $compressBlobs Whether blobs should be compressed for storage

Definition at line 145 of file SqlBlobStore.php.

◆ setLegacyEncoding()

MediaWiki\Storage\SqlBlobStore::setLegacyEncoding ( string $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 165 of file SqlBlobStore.php.

◆ setUseExternalStore()

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

Parameters

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

Definition at line 179 of file SqlBlobStore.php.

◆ 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

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

Definition at line 782 of file SqlBlobStore.php.

References wfCgiToArray().

Referenced by 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 210 of file SqlBlobStore.php.

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

Member Data Documentation

◆ DEFAULT_TTL

const MediaWiki\Storage\SqlBlobStore::DEFAULT_TTL = 7 * 24 * 3600

Access: internal

Definition at line 56 of file SqlBlobStore.php.

◆ TEXT_CACHE_GROUP

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

Definition at line 53 of file SqlBlobStore.php.

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

includes/Storage/SqlBlobStore.php

Public Member Functions

Static Public Member Functions

Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ compressData()

◆ decompressData()

◆ expandBlob()

◆ explodeFlags()

◆ getBlob()

◆ getBlobBatch()

◆ getCacheExpiry()

◆ getCompressBlobs()

◆ getLegacyEncoding()

◆ getTextIdFromAddress()

◆ getUseExternalStore()

◆ isReadOnly()

◆ makeAddressFromTextId()

◆ setCacheExpiry()

◆ setCompressBlobs()

◆ setLegacyEncoding()

◆ setUseExternalStore()

◆ splitBlobAddress()

◆ storeBlob()

Member Data Documentation

◆ DEFAULT_TTL

◆ TEXT_CACHE_GROUP