supysonic/schema/migration/20171230.mysql.py

# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# This file is part of Supysonic.
# Supysonic is a Python implementation of the Subsonic server API.
#
# Copyright (C) 2017 Alban 'spl0k' Féron
#
# Distributed under terms of the GNU AGPLv3 license.

# Converts ids from hex-encoded strings to binary data

import argparse
try:
    import MySQLdb as provider
except ImportError:
    import pymysql as provider

from uuid import UUID
from warnings import filterwarnings

parser = argparse.ArgumentParser()
parser.add_argument('username')
parser.add_argument('password')
parser.add_argument('database')
parser.add_argument('-H', '--host', default = 'localhost', help = 'default: localhost')
args = parser.parse_args()

def process_table(connection, table, fields, nullable_fields = ()):
    to_update = { field: set() for field in fields + nullable_fields }

    c = connection.cursor()
    c.execute('SELECT {1} FROM {0}'.format(table, ','.join(fields + nullable_fields)))
    for row in c:
        for field, value in zip(fields + nullable_fields, row):
            if value is None or not isinstance(value, basestring):
                continue
            to_update[field].add(value)

    for field, values in to_update.iteritems():
        if not values:
            continue
        sql = 'UPDATE {0} SET {1}=%s WHERE {1}=%s'.format(table, field)
        c.executemany(sql, map(lambda v: (UUID(v).bytes, v), values))
    for field in fields:
        sql = 'ALTER TABLE {0} MODIFY {1} BINARY(16) NOT NULL'.format(table, field)
        c.execute(sql)
    for field in nullable_fields:
        sql = 'ALTER TABLE {0} MODIFY {1} BINARY(16)'.format(table, field)
        c.execute(sql)

    connection.commit()

filterwarnings('ignore', category = provider.Warning)
conn =  provider.connect(host = args.host, user = args.username, passwd = args.password, db = args.database)
conn.cursor().execute('SET FOREIGN_KEY_CHECKS = 0')

process_table(conn, 'folder', ('id',), ('parent_id',))
process_table(conn, 'artist', ('id',))
process_table(conn, 'album', ('id', 'artist_id'))
process_table(conn, 'track', ('id', 'album_id', 'artist_id', 'root_folder_id', 'folder_id'))
process_table(conn, 'user', ('id',), ('last_play_id',))
process_table(conn, 'client_prefs', ('user_id',))
process_table(conn, 'starred_folder', ('user_id', 'starred_id'))
process_table(conn, 'starred_artist', ('user_id', 'starred_id'))
process_table(conn, 'starred_album', ('user_id', 'starred_id'))
process_table(conn, 'starred_track', ('user_id', 'starred_id'))
process_table(conn, 'rating_folder', ('user_id', 'rated_id'))
process_table(conn, 'rating_track', ('user_id', 'rated_id'))
process_table(conn, 'chat_message', ('id', 'user_id'))
process_table(conn, 'playlist', ('id', 'user_id'))

conn.cursor().execute('SET FOREIGN_KEY_CHECKS = 1')
conn.close()