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<?php
/**
* Custom job to perform updates on tables in busier environments
*
* Job parameters include:
* - table : DB table to update
* - column : The *_user_text column to update
* - oldname : The old user name
* - newname : The new user name
* - count : The expected number of rows to update in this batch
* - logId : The ID of the logging table row expected to exist if the rename was committed
*
* Additionally, one of the following groups of parameters must be set:
* a) The timestamp based rename paramaters:
* - timestampColumn : The *_timestamp column
* - minTimestamp : The minimum bound of the timestamp column range for this batch
* - maxTimestamp : The maximum bound of the timestamp column range for this batch
* - uniqueKey : A column that is unique (preferrably the PRIMARY KEY) [optional]
* b) The unique key based rename paramaters:
* - uniqueKey : A column that is unique (preferrably the PRIMARY KEY)
* - keyId : A list of values for this column to determine rows to update for this batch
*
* To avoid some race conditions, the following parameters should be set:
* - userID : The ID of the user to update
* - uidColumn : The *_user_id column
*/
class RenameUserJob extends Job {
public function __construct( Title $title, $params = [], $id = 0 ) {
parent::__construct( 'renameUser', $title, $params, $id );
}
public function run() {
global $wgUpdateRowsPerQuery;
$table = $this->params['table'];
$column = $this->params['column'];
$oldname = $this->params['oldname'];
$newname = $this->params['newname'];
$count = $this->params['count'];
if ( isset( $this->params['userID'] ) ) {
$userID = $this->params['userID'];
$uidColumn = $this->params['uidColumn'];
} else {
$userID = null;
$uidColumn = null;
}
if ( isset( $this->params['timestampColumn'] ) ) {
$timestampColumn = $this->params['timestampColumn'];
$minTimestamp = $this->params['minTimestamp'];
$maxTimestamp = $this->params['maxTimestamp'];
} else {
$timestampColumn = null;
$minTimestamp = null;
$maxTimestamp = null;
}
$uniqueKey = isset( $this->params['uniqueKey'] ) ? $this->params['uniqueKey'] : null;
$keyId = isset( $this->params['keyId'] ) ? $this->params['keyId'] : null;
$logId = isset( $this->params['logId'] ) ? $this->params['logId'] : null;
$dbw = wfGetDB( DB_MASTER );
if ( $logId ) {
# Block until the transaction that inserted this job commits.
# The atomic section is for sanity as FOR UPDATE does not lock in auto-commit mode
# per http://dev.mysql.com/doc/refman/5.7/en/innodb-locking-reads.html.
$dbw->startAtomic( __METHOD__ );
$committed = $dbw->selectField( 'logging',
'1',
[ 'log_id' => $logId ],
__METHOD__,
[ 'FOR UPDATE' ]
);
$dbw->endAtomic( __METHOD__ );
# If the transaction inserting this job was rolled back, detect that
if ( $committed === false ) { // rollback happened?
throw new LogicException( 'Cannot run job if the account rename failed.' );
}
}
# Flush any state snapshot data (and release the lock above)
$dbw->commit( __METHOD__, 'flush' );
# Conditions like "*_user_text = 'x'
$conds = [ $column => $oldname ];
# If user ID given, add that to condition to avoid rename collisions
if ( $userID !== null ) {
$conds[$uidColumn] = $userID;
}
# Bound by timestamp if given
if ( $timestampColumn !== null ) {
$conds[] = "$timestampColumn >= " . $dbw->addQuotes( $minTimestamp );
$conds[] = "$timestampColumn <= " . $dbw->addQuotes( $maxTimestamp );
# Bound by unique key if given (B/C)
} elseif ( $uniqueKey !== null && $keyId !== null ) {
$conds[$uniqueKey] = $keyId;
} else {
throw new InvalidArgumentException( 'Expected ID batch or time range' );
}
$affectedCount = 0;
# Actually update the rows for this job...
if ( $uniqueKey !== null ) {
# Select the rows to update by PRIMARY KEY
$ids = $dbw->selectFieldValues( $table, $uniqueKey, $conds, __METHOD__ );
# Update these rows by PRIMARY KEY to avoid slave lag
foreach ( array_chunk( $ids, $wgUpdateRowsPerQuery ) as $batch ) {
$dbw->commit( __METHOD__, 'flush' );
wfWaitForSlaves();
$dbw->update( $table,
[ $column => $newname ],
[ $column => $oldname, $uniqueKey => $batch ],
__METHOD__
);
$affectedCount += $dbw->affectedRows();
}
} else {
# Update the chunk of rows directly
$dbw->update( $table,
[ $column => $newname ],
$conds,
__METHOD__
);
$affectedCount += $dbw->affectedRows();
}
# Special case: revisions may be deleted while renaming...
if ( $affectedCount < $count && $table === 'revision' && $timestampColumn !== null ) {
# If some revisions were not renamed, they may have been deleted.
# Do a pass on the archive table to get these straglers...
$ids = $dbw->selectFieldValues(
'archive',
'ar_id',
[
'ar_user_text' => $oldname,
'ar_user' => $userID,
// No user,rev_id index, so use timestamp to bound
// the rows. This can use the user,timestamp index.
"ar_timestamp >= '$minTimestamp'",
"ar_timestamp <= '$maxTimestamp'"
],
__METHOD__
);
foreach ( array_chunk( $ids, $wgUpdateRowsPerQuery ) as $batch ) {
$dbw->commit( __METHOD__, 'flush' );
wfWaitForSlaves();
$dbw->update(
'archive',
[ 'ar_user_text' => $newname ],
[ 'ar_user_text' => $oldname, 'ar_id' => $batch ],
__METHOD__
);
}
}
# Special case: revisions may be restored while renaming...
if ( $affectedCount < $count && $table === 'archive' && $timestampColumn !== null ) {
# If some revisions were not renamed, they may have been restored.
# Do a pass on the revision table to get these straglers...
$ids = $dbw->selectFieldValues(
'revision',
'rev_id',
[
'rev_user_text' => $oldname,
'rev_user' => $userID,
// No user,rev_id index, so use timestamp to bound
// the rows. This can use the user,timestamp index.
"rev_timestamp >= '$minTimestamp'",
"rev_timestamp <= '$maxTimestamp'"
],
__METHOD__
);
foreach ( array_chunk( $ids, $wgUpdateRowsPerQuery ) as $batch ) {
$dbw->commit( __METHOD__, 'flush' );
wfWaitForSlaves();
$dbw->update(
'revision',
[ 'rev_user_text' => $newname ],
[ 'rev_user_text' => $oldname, 'rev_id' => $batch ],
__METHOD__
);
}
}
return true;
}
}