Handle database storage of comments such as edit summaries and log reasons. More...

Collaboration diagram for CommentStore:

[legend]

Public Member Functions
	__construct (Language $lang, $stage)

	createComment (IDatabase $dbw, $comment, array $data=null)
	Create a new CommentStoreComment, inserting it into the database if necessary.

	getComment ( $key, $row=null, $fallback=false)
	Extract the comment from a row.

	getCommentLegacy (IDatabase $db, $key, $row=null, $fallback=false)
	Extract the comment from a row, with legacy lookups.

	getFields ( $key)
	Get SELECT fields for the comment key.

	getJoin ( $key)
	Get SELECT fields and joins for the comment key.

	insert (IDatabase $dbw, $key, $comment=null, $data=null)
	Insert a comment in preparation for a row that references it.

	insertWithTempTable (IDatabase $dbw, $key, $comment=null, $data=null)
	Insert a comment in a temporary table in preparation for a row that references it.

Static Public Member Functions
static	getStore ()

static	hash ( $text, $data)
	Hashing function for comment storage.

Public Attributes
const	COMMENT_CHARACTER_LIMIT = 500
	Maximum length of a comment in UTF-8 characters.

const	MAX_DATA_LENGTH = 65535
	Maximum length of serialized data in bytes.

Protected Attributes
const	TEMP_TABLES
	Define fields that use temporary tables for transitional purposes Array keys are field names, values are arrays with these possible fields:

Private Member Functions
	getCommentInternal (?IDatabase $db, $key, $row, $fallback=false)
	Extract the comment from a row.

	insertInternal (IDatabase $dbw, $key, $comment, $data)
	Implementation for `self::insert()` and `self::insertWithTempTable()`

Static Private Member Functions
static	decodeMessage ( $data)
	Decode a message that was encoded by self::encodeMessage()

static	encodeMessage (Message $msg)
	Encode a Message as a PHP data structure.

Private Attributes
array[]	$joinCache = []
	Cache for `self::getJoin()`

Language	$lang
	Language to use for comment truncation.

int	$stage
	One of the MIGRATION_* constants, or an appropriate combination of SCHEMA_COMPAT_* constants.

Detailed Description

Handle database storage of comments such as edit summaries and log reasons.

Since: 1.30

Definition at line 42 of file CommentStore.php.

Constructor & Destructor Documentation

◆ __construct()

CommentStore::__construct	(	Language	$lang,
			$stage
	)

Parameters

Language	$lang	Language to use for comment truncation. Defaults to content language.
int	$stage	One of the MIGRATION_* constants, or an appropriate combination of SCHEMA_COMPAT_* constants. Always MIGRATION_NEW for MediaWiki core since 1.33.

Definition at line 103 of file CommentStore.php.

References $lang, SCHEMA_COMPAT_READ_BOTH, and SCHEMA_COMPAT_WRITE_BOTH.

Member Function Documentation

◆ createComment()

CommentStore::createComment	(	IDatabase	$dbw,
			$comment,
		array	$data = `null`
	)

Create a new CommentStoreComment, inserting it into the database if necessary.

If a comment is going to be passed to self::insert() or the like multiple times, it will be more efficient to pass a CommentStoreComment once rather than making self::insert() do it every time through.

Note: When passing a CommentStoreComment, this may set $comment->id if it's not already set. If $comment->id is already set, it will not be verified that the specified comment actually exists or that it corresponds to the comment text, message, and/or data in the CommentStoreComment.

Parameters

IDatabase	$dbw	Database handle to insert on. Unused if `$comment` is a CommentStoreComment and `$comment->id` is set.
string \| Message \| CommentStoreComment	$comment	Comment text or Message object, or a CommentStoreComment.
array \| null	$data	Structured data to store. Keys beginning with '_' are reserved. Ignored if $comment is a CommentStoreComment.

Returns: CommentStoreComment

Definition at line 434 of file CommentStore.php.

References Wikimedia\Rdbms\IDatabase\insert(), Wikimedia\Rdbms\IDatabase\insertId(), SCHEMA_COMPAT_WRITE_NEW, Wikimedia\Rdbms\IDatabase\selectField(), and true.

Referenced by insertInternal().

◆ decodeMessage()

static CommentStore::decodeMessage ( $data )

staticprivate

Decode a message that was encoded by self::encodeMessage()

Parameters

array $data

Returns: Message

Definition at line 628 of file CommentStore.php.

◆ encodeMessage()

static CommentStore::encodeMessage ( Message $msg )

staticprivate

Encode a Message as a PHP data structure.

Parameters

Message $msg

Returns: array

Definition at line 609 of file CommentStore.php.

References Message\getKey(), Message\getKeysToTry(), and Message\getParams().

◆ getComment()

CommentStore::getComment	(	$key,
		$row = `null`,
		$fallback = `false`
	)

Extract the comment from a row.

Use self::getJoin() to ensure the row contains the needed data.

If you need to fake a comment in a row for some reason, set fields {$key}_text (string) and {$key}_data (JSON string or null).

Since: 1.30; 1.31 Method signature changed, $key parameter added (required since 1.35)

Parameters

string	$key	A key such as "rev_comment" identifying the comment field being fetched.
stdClass \| array \| null	$row	Result row.
bool	$fallback	If true, fall back as well as possible instead of throwing an exception.

Returns: CommentStoreComment

Definition at line 377 of file CommentStore.php.

References $fallback, and getCommentInternal().

◆ getCommentInternal()

CommentStore::getCommentInternal	(	?IDatabase	$db,
			$key,
			$row,
			$fallback = `false`
	)

private

Extract the comment from a row.

Shared implementation for getComment() and getCommentLegacy()

Parameters

IDatabase \| null	$db	Database handle for getCommentLegacy(), or null for getComment()
string	$key	A key such as "rev_comment" identifying the comment field being fetched.
stdClass \| array	$row
bool	$fallback

Returns: CommentStoreComment

Definition at line 249 of file CommentStore.php.

References $fallback, $t, MIGRATION_NEW, SCHEMA_COMPAT_READ_BOTH, SCHEMA_COMPAT_READ_NEW, SCHEMA_COMPAT_READ_OLD, Wikimedia\Rdbms\IDatabase\selectRow(), and wfLogWarning().

Referenced by getComment(), and getCommentLegacy().

◆ getCommentLegacy()

CommentStore::getCommentLegacy	(	IDatabase	$db,
			$key,
			$row = `null`,
			$fallback = `false`
	)

Extract the comment from a row, with legacy lookups.

If $row might have been generated using self::getFields() rather than self::getJoin(), use this. Prefer self::getComment() if you know callers used self::getJoin() for the row fetch.

If you need to fake a comment in a row for some reason, set fields {$key}_text (string) and {$key}_data (JSON string or null).

Since: 1.30; 1.31 Method signature changed, $key parameter added (required since 1.35)

Parameters

IDatabase	$db	Database handle to use for lookup
string	$key	A key such as "rev_comment" identifying the comment field being fetched.
stdClass \| array \| null	$row	Result row.
bool	$fallback	If true, fall back as well as possible instead of throwing an exception.

Returns: CommentStoreComment

Definition at line 405 of file CommentStore.php.

References $fallback, and getCommentInternal().

◆ getFields()

CommentStore::getFields ( $key )

Get SELECT fields for the comment key.

Each resulting row should be passed to self::getCommentLegacy() to get the actual comment.

Note: Use of this method may require a subsequent database query to actually fetch the comment. If possible, use self::getJoin() instead.

Since: 1.30; 1.31 Method signature changed, $key parameter added (required since 1.35)

Parameters

string $key A key such as "rev_comment" identifying the comment field being fetched.

Returns: string[] to include in the $vars to IDatabase->select(). All fields are aliased, so + is safe to use.

Definition at line 140 of file CommentStore.php.

References MIGRATION_NEW, SCHEMA_COMPAT_READ_BOTH, SCHEMA_COMPAT_READ_NEW, and SCHEMA_COMPAT_READ_OLD.

◆ getJoin()

CommentStore::getJoin ( $key )

Get SELECT fields and joins for the comment key.

Each resulting row should be passed to self::getComment() to get the actual comment.

Since: 1.30; 1.31 Method signature changed, $key parameter added (required since 1.35)

Parameters

string $key A key such as "rev_comment" identifying the comment field being fetched.

Returns

array[] With three keys:

tables: (string[]) to include in the $table to IDatabase->select()
fields: (string[]) to include in the $vars to IDatabase->select()
joins: (array) to include in the $join_conds to IDatabase->select() All tables, fields, and joins are aliased, so + is safe to use.

Definition at line 179 of file CommentStore.php.

References $t, MIGRATION_NEW, SCHEMA_COMPAT_READ_BOTH, SCHEMA_COMPAT_READ_NEW, and SCHEMA_COMPAT_READ_OLD.

◆ getStore()

static CommentStore::getStore ( )

static

Since: 1.31

Deprecated:: in 1.31 Use DI to inject a CommentStore instance into your class.

Returns: CommentStore

Definition at line 120 of file CommentStore.php.

◆ hash()

static CommentStore::hash	(	$text,
		$data
	)

static

Hashing function for comment storage.

Parameters

string	$text	Comment text
string \| null	$data	Comment data

Returns: int 32-bit signed integer

Definition at line 647 of file CommentStore.php.

◆ insert()

CommentStore::insert	(	IDatabase	$dbw,
			$key,
			$comment = `null`,
			$data = `null`
	)

Insert a comment in preparation for a row that references it.

Note: It's recommended to include both the call to this method and the row insert in the same transaction.

Since: 1.30; 1.31 Method signature changed, $key parameter added (required since 1.35)

Parameters

IDatabase	$dbw	Database handle to insert on
string	$key	A key such as "rev_comment" identifying the comment field being fetched.
string \| Message \| CommentStoreComment \| null	$comment	As for `self::createComment()`
array \| null	$data	As for `self::createComment()`

Returns: array Fields for the insert or update

Definition at line 545 of file CommentStore.php.

References insertInternal(), MIGRATION_NEW, and SCHEMA_COMPAT_WRITE_OLD.

◆ insertInternal()

CommentStore::insertInternal	(	IDatabase	$dbw,
			$key,
			$comment,
			$data
	)

private

Implementation for self::insert() and self::insertWithTempTable()

Parameters

IDatabase	$dbw
string	$key	A key such as "rev_comment" identifying the comment field being fetched.
string \| Message \| CommentStoreComment	$comment
array \| null	$data

Returns: array [ array $fields, callable $callback ]

Definition at line 495 of file CommentStore.php.

References $t, createComment(), Wikimedia\Rdbms\IDatabase\insert(), MIGRATION_NEW, SCHEMA_COMPAT_WRITE_NEW, and SCHEMA_COMPAT_WRITE_OLD.

Referenced by insert(), and insertWithTempTable().

◆ insertWithTempTable()

CommentStore::insertWithTempTable	(	IDatabase	$dbw,
			$key,
			$comment = `null`,
			$data = `null`
	)

Insert a comment in a temporary table in preparation for a row that references it.

This is currently needed for "rev_comment" and "img_description". In the future that requirement will be removed.

Note: It's recommended to include both the call to this method and the row insert in the same transaction.

Since: 1.30; 1.31 Method signature changed, $key parameter added (required since 1.35)

Parameters

IDatabase	$dbw	Database handle to insert on
string	$key	A key such as "rev_comment" identifying the comment field being fetched.
string \| Message \| CommentStoreComment \| null	$comment	As for `self::createComment()`
array \| null	$data	As for `self::createComment()`

Returns

array Two values:

array Fields for the insert or update
callable Function to call when the primary key of the row being inserted/updated is known. Pass it that primary key.

Definition at line 582 of file CommentStore.php.

References insertInternal(), and wfDeprecated().

Member Data Documentation

◆ $joinCache

array [] CommentStore::$joinCache = []

private

Cache for self::getJoin()

Definition at line 91 of file CommentStore.php.

◆ $lang

Language CommentStore::$lang

private

Language to use for comment truncation.

Definition at line 94 of file CommentStore.php.

◆ $stage

int CommentStore::$stage

private

One of the MIGRATION_* constants, or an appropriate combination of SCHEMA_COMPAT_* constants.

Todo:: Deprecate and remove once extensions seem unlikely to need to use it for migration anymore.

Definition at line 88 of file CommentStore.php.

◆ COMMENT_CHARACTER_LIMIT

const CommentStore::COMMENT_CHARACTER_LIMIT = 500

Maximum length of a comment in UTF-8 characters.

Longer comments will be truncated.

Note: This must be at least 255 and not greater than floor( MAX_DATA_LENGTH / 4 ).

Definition at line 48 of file CommentStore.php.

◆ MAX_DATA_LENGTH

const CommentStore::MAX_DATA_LENGTH = 65535

Maximum length of serialized data in bytes.

Longer data will result in an exception.

Note: This value is determined by the size of the underlying database field, currently BLOB in MySQL/MariaDB.

Definition at line 55 of file CommentStore.php.

◆ TEMP_TABLES

const CommentStore::TEMP_TABLES

protected

Initial value:

= [
        'rev_comment' => [
            'table' => 'revision_comment_temp',
            'pk' => 'revcomment_rev',
            'field' => 'revcomment_comment_id',
            'joinPK' => 'rev_id',
            'stage' => MIGRATION_OLD,
            'deprecatedIn' => null,
        ],
        'img_description' => [
            'stage' => MIGRATION_NEW,
            'deprecatedIn' => '1.32',
        ],
    ]

Define fields that use temporary tables for transitional purposes Array keys are field names, values are arrays with these possible fields:

table: Temporary table name
pk: Temporary table column referring to the main table's primary key
field: Temporary table column referring comment.comment_id
joinPK: Main table's primary key
stage: Migration stage
deprecatedIn: Version when using insertWithTempTable() was deprecated

Definition at line 67 of file CommentStore.php.

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

includes/CommentStore.php

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Attributes

Private Member Functions

Static Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ createComment()

◆ decodeMessage()

◆ encodeMessage()

◆ getComment()

◆ getCommentInternal()

◆ getCommentLegacy()

◆ getFields()

◆ getJoin()

◆ getStore()

◆ hash()

◆ insert()

◆ insertInternal()

◆ insertWithTempTable()

Member Data Documentation

◆ $joinCache

◆ $lang

◆ $stage

◆ COMMENT_CHARACTER_LIMIT

◆ MAX_DATA_LENGTH

◆ TEMP_TABLES