upgradeLogging.php

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<?php
require __DIR__ . '/../commandLine.inc';

class UpdateLogging {

    public $dbw;
    public $batchSize = 1000;
    public $minTs = false;

    function execute() {
        $this->dbw = $this->getDB( DB_MASTER );
        $logging = $this->dbw->tableName( 'logging' );
        $logging_1_10 = $this->dbw->tableName( 'logging_1_10' );
        $logging_pre_1_10 = $this->dbw->tableName( 'logging_pre_1_10' );

        if ( $this->dbw->tableExists( 'logging_pre_1_10' ) && !$this->dbw->tableExists( 'logging' ) ) {
            # Fix previous aborted run
            echo "Cleaning up from previous aborted run\n";
            $this->dbw->query( "RENAME TABLE $logging_pre_1_10 TO $logging", __METHOD__ );
        }

        if ( $this->dbw->tableExists( 'logging_pre_1_10' ) ) {
            echo "This script has already been run to completion\n";

            return;
        }

        # Create the target table
        if ( !$this->dbw->tableExists( 'logging_1_10' ) ) {
            global $wgDBTableOptions;

            $sql = <<<EOT
CREATE TABLE $logging_1_10 (
  -- Log ID, for referring to this specific log entry, probably for deletion and such.
  log_id int unsigned NOT NULL auto_increment,

  -- Symbolic keys for the general log type and the action type
  -- within the log. The output format will be controlled by the
  -- action field, but only the type controls categorization.
  log_type varbinary(10) NOT NULL default '',
  log_action varbinary(10) NOT NULL default '',

  -- Timestamp. Duh.
  log_timestamp binary(14) NOT NULL default '19700101000000',

  -- The user who performed this action; key to user_id
  log_user int unsigned NOT NULL default 0,

  -- Key to the page affected. Where a user is the target,
  -- this will point to the user page.
  log_namespace int NOT NULL default 0,
  log_title varchar(255) binary NOT NULL default '',

  -- Freeform text. Interpreted as edit history comments.
  log_comment varchar(255) NOT NULL default '',

  -- LF separated list of miscellaneous parameters
  log_params blob NOT NULL,

  -- rev_deleted for logs
  log_deleted tinyint unsigned NOT NULL default '0',

  PRIMARY KEY log_id (log_id),
  KEY type_time (log_type, log_timestamp),
  KEY user_time (log_user, log_timestamp),
  KEY page_time (log_namespace, log_title, log_timestamp),
  KEY times (log_timestamp)

) $wgDBTableOptions
EOT;
            echo "Creating table logging_1_10\n";
            $this->dbw->query( $sql, __METHOD__ );
        }

        # Synchronise the tables
        echo "Doing initial sync...\n";
        $this->sync( 'logging', 'logging_1_10' );
        echo "Sync done\n\n";

        # Rename the old table away
        echo "Renaming the old table to $logging_pre_1_10\n";
        $this->dbw->query( "RENAME TABLE $logging TO $logging_pre_1_10", __METHOD__ );

        # Copy remaining old rows
        # Done before the new table is active so that $copyPos is accurate
        echo "Doing final sync...\n";
        $this->sync( 'logging_pre_1_10', 'logging_1_10' );

        # Move the new table in
        echo "Moving the new table in...\n";
        $this->dbw->query( "RENAME TABLE $logging_1_10 TO $logging", __METHOD__ );
        echo "Finished.\n";
    }

    function sync( $srcTable, $dstTable ) {
        $batchSize = 1000;
        $minTs = $this->dbw->selectField( $srcTable, 'MIN(log_timestamp)', false, __METHOD__ );
        $minTsUnix = wfTimestamp( TS_UNIX, $minTs );
        $numRowsCopied = 0;

        while ( true ) {
            $maxTs = $this->dbw->selectField( $srcTable, 'MAX(log_timestamp)', false, __METHOD__ );
            $copyPos = $this->dbw->selectField( $dstTable, 'MAX(log_timestamp)', false, __METHOD__ );
            $maxTsUnix = wfTimestamp( TS_UNIX, $maxTs );
            $copyPosUnix = wfTimestamp( TS_UNIX, $copyPos );

            if ( $copyPos === null ) {
                $percent = 0;
            } else {
                $percent = ( $copyPosUnix - $minTsUnix ) / ( $maxTsUnix - $minTsUnix ) * 100;
            }
            printf( "%s  %.2f%%\n", $copyPos, $percent );

            # Handle all entries with timestamp equal to $copyPos
            if ( $copyPos !== null ) {
                $numRowsCopied += $this->copyExactMatch( $srcTable, $dstTable, $copyPos );
            }

            # Now copy a batch of rows
            if ( $copyPos === null ) {
                $conds = false;
            } else {
                $conds = [ 'log_timestamp > ' . $this->dbw->addQuotes( $copyPos ) ];
            }
            $srcRes = $this->dbw->select( $srcTable, '*', $conds, __METHOD__,
                [ 'LIMIT' => $batchSize, 'ORDER BY' => 'log_timestamp' ] );

            if ( !$srcRes->numRows() ) {
                # All done
                break;
            }

            $batch = [];
            foreach ( $srcRes as $srcRow ) {
                $batch[] = (array)$srcRow;
            }
            $this->dbw->insert( $dstTable, $batch, __METHOD__ );
            $numRowsCopied += count( $batch );

            wfWaitForSlaves();
        }
        echo "Copied $numRowsCopied rows\n";
    }

    function copyExactMatch( $srcTable, $dstTable, $copyPos ) {
        $numRowsCopied = 0;
        $srcRes = $this->dbw->select( $srcTable, '*', [ 'log_timestamp' => $copyPos ], __METHOD__ );
        $dstRes = $this->dbw->select( $dstTable, '*', [ 'log_timestamp' => $copyPos ], __METHOD__ );

        if ( $srcRes->numRows() ) {
            $srcRow = $srcRes->fetchObject();
            $srcFields = array_keys( (array)$srcRow );
            $srcRes->seek( 0 );
            $dstRowsSeen = [];

            # Make a hashtable of rows that already exist in the destination
            foreach ( $dstRes as $dstRow ) {
                $reducedDstRow = [];
                foreach ( $srcFields as $field ) {
                    $reducedDstRow[$field] = $dstRow->$field;
                }
                $hash = md5( serialize( $reducedDstRow ) );
                $dstRowsSeen[$hash] = true;
            }

            # Copy all the source rows that aren't already in the destination
            foreach ( $srcRes as $srcRow ) {
                $hash = md5( serialize( (array)$srcRow ) );
                if ( !isset( $dstRowsSeen[$hash] ) ) {
                    $this->dbw->insert( $dstTable, (array)$srcRow, __METHOD__ );
                    $numRowsCopied++;
                }
            }
        }

        return $numRowsCopied;
    }
}

$ul = new UpdateLogging;
$ul->execute();