import logging from typing import List from sqlalchemy import inspect, text logger = logging.getLogger(__name__) def get_table_names_for_table(inspector, tabletype): return [t for t in inspector.get_table_names() if t.startswith(tabletype)] def has_column(columns: List, searchname: str) -> bool: return len(list(filter(lambda x: x["name"] == searchname, columns))) == 1 def get_column_def(columns: List, column: str, default: str) -> str: return default if not has_column(columns, column) else column def get_backup_name(tabs, backup_prefix: str): table_back_name = backup_prefix for i, table_back_name in enumerate(tabs): table_back_name = f'{backup_prefix}{i}' logger.debug(f'trying {table_back_name}') return table_back_name def get_last_sequence_ids(engine, trade_back_name, order_back_name): order_id: int = None trade_id: int = None if engine.name == 'postgresql': with engine.begin() as connection: trade_id = connection.execute(text("select nextval('trades_id_seq')")).fetchone()[0] order_id = connection.execute(text("select nextval('orders_id_seq')")).fetchone()[0] with engine.begin() as connection: connection.execute(text( f"ALTER SEQUENCE orders_id_seq rename to {order_back_name}_id_seq_bak")) connection.execute(text( f"ALTER SEQUENCE trades_id_seq rename to {trade_back_name}_id_seq_bak")) return order_id, trade_id def set_sequence_ids(engine, order_id, trade_id): if engine.name == 'postgresql': with engine.begin() as connection: if order_id: connection.execute(text(f"ALTER SEQUENCE orders_id_seq RESTART WITH {order_id}")) if trade_id: connection.execute(text(f"ALTER SEQUENCE trades_id_seq RESTART WITH {trade_id}")) def migrate_trades_and_orders_table( decl_base, inspector, engine, trade_back_name: str, cols: List, order_back_name: str): fee_open = get_column_def(cols, 'fee_open', 'fee') fee_open_cost = get_column_def(cols, 'fee_open_cost', 'null') fee_open_currency = get_column_def(cols, 'fee_open_currency', 'null') fee_close = get_column_def(cols, 'fee_close', 'fee') fee_close_cost = get_column_def(cols, 'fee_close_cost', 'null') fee_close_currency = get_column_def(cols, 'fee_close_currency', 'null') open_rate_requested = get_column_def(cols, 'open_rate_requested', 'null') close_rate_requested = get_column_def(cols, 'close_rate_requested', 'null') stop_loss = get_column_def(cols, 'stop_loss', '0.0') stop_loss_pct = get_column_def(cols, 'stop_loss_pct', 'null') initial_stop_loss = get_column_def(cols, 'initial_stop_loss', '0.0') initial_stop_loss_pct = get_column_def(cols, 'initial_stop_loss_pct', 'null') stoploss_order_id = get_column_def(cols, 'stoploss_order_id', 'null') stoploss_last_update = get_column_def(cols, 'stoploss_last_update', 'null') max_rate = get_column_def(cols, 'max_rate', '0.0') min_rate = get_column_def(cols, 'min_rate', 'null') sell_reason = get_column_def(cols, 'sell_reason', 'null') strategy = get_column_def(cols, 'strategy', 'null') buy_tag = get_column_def(cols, 'buy_tag', 'null') # If ticker-interval existed use that, else null. if has_column(cols, 'ticker_interval'): timeframe = get_column_def(cols, 'timeframe', 'ticker_interval') else: timeframe = get_column_def(cols, 'timeframe', 'null') open_trade_value = get_column_def(cols, 'open_trade_value', f'amount * open_rate * (1 + {fee_open})') close_profit_abs = get_column_def( cols, 'close_profit_abs', f"(amount * close_rate * (1 - {fee_close})) - {open_trade_value}") sell_order_status = get_column_def(cols, 'sell_order_status', 'null') amount_requested = get_column_def(cols, 'amount_requested', 'amount') # Schema migration necessary with engine.begin() as connection: connection.execute(text(f"alter table trades rename to {trade_back_name}")) with engine.begin() as connection: # drop indexes on backup table in new session for index in inspector.get_indexes(trade_back_name): if engine.name == 'mysql': connection.execute(text(f"drop index {index['name']} on {trade_back_name}")) else: connection.execute(text(f"drop index {index['name']}")) order_id, trade_id = get_last_sequence_ids(engine, trade_back_name, order_back_name) drop_orders_table(engine, order_back_name) # let SQLAlchemy create the schema as required decl_base.metadata.create_all(engine) # Copy data back - following the correct schema with engine.begin() as connection: connection.execute(text(f"""insert into trades (id, exchange, pair, is_open, fee_open, fee_open_cost, fee_open_currency, fee_close, fee_close_cost, fee_close_currency, open_rate, open_rate_requested, close_rate, close_rate_requested, close_profit, stake_amount, amount, amount_requested, open_date, close_date, open_order_id, stop_loss, stop_loss_pct, initial_stop_loss, initial_stop_loss_pct, stoploss_order_id, stoploss_last_update, max_rate, min_rate, sell_reason, sell_order_status, strategy, buy_tag, timeframe, open_trade_value, close_profit_abs ) select id, lower(exchange), pair, is_open, {fee_open} fee_open, {fee_open_cost} fee_open_cost, {fee_open_currency} fee_open_currency, {fee_close} fee_close, {fee_close_cost} fee_close_cost, {fee_close_currency} fee_close_currency, open_rate, {open_rate_requested} open_rate_requested, close_rate, {close_rate_requested} close_rate_requested, close_profit, stake_amount, amount, {amount_requested}, open_date, close_date, open_order_id, {stop_loss} stop_loss, {stop_loss_pct} stop_loss_pct, {initial_stop_loss} initial_stop_loss, {initial_stop_loss_pct} initial_stop_loss_pct, {stoploss_order_id} stoploss_order_id, {stoploss_last_update} stoploss_last_update, {max_rate} max_rate, {min_rate} min_rate, {sell_reason} sell_reason, {sell_order_status} sell_order_status, {strategy} strategy, {buy_tag} buy_tag, {timeframe} timeframe, {open_trade_value} open_trade_value, {close_profit_abs} close_profit_abs from {trade_back_name} """)) migrate_orders_table(engine, order_back_name, cols) set_sequence_ids(engine, order_id, trade_id) def migrate_open_orders_to_trades(engine): with engine.begin() as connection: connection.execute(text(""" insert into orders (ft_trade_id, ft_pair, order_id, ft_order_side, ft_is_open) select id ft_trade_id, pair ft_pair, open_order_id, case when close_rate_requested is null then 'buy' else 'sell' end ft_order_side, 1 ft_is_open from trades where open_order_id is not null union all select id ft_trade_id, pair ft_pair, stoploss_order_id order_id, 'stoploss' ft_order_side, 1 ft_is_open from trades where stoploss_order_id is not null """)) def drop_orders_table(engine, table_back_name: str): # Drop and recreate orders table as backup # This drops foreign keys, too. with engine.begin() as connection: connection.execute(text(f"create table {table_back_name} as select * from orders")) connection.execute(text("drop table orders")) def migrate_orders_table(engine, table_back_name: str, cols: List): # let SQLAlchemy create the schema as required with engine.begin() as connection: connection.execute(text(f""" insert into orders ( id, ft_trade_id, ft_order_side, ft_pair, ft_is_open, order_id, status, symbol, order_type, side, price, amount, filled, average, remaining, cost, order_date, order_filled_date, order_update_date) select id, ft_trade_id, ft_order_side, ft_pair, ft_is_open, order_id, status, symbol, order_type, side, price, amount, filled, null average, remaining, cost, order_date, order_filled_date, order_update_date from {table_back_name} """)) def set_sqlite_to_wal(engine): if engine.name == 'sqlite' and str(engine.url) != 'sqlite://': # Set Mode to with engine.begin() as connection: connection.execute(text("PRAGMA journal_mode=wal")) def check_migrate(engine, decl_base, previous_tables) -> None: """ Checks if migration is necessary and migrates if necessary """ inspector = inspect(engine) cols = inspector.get_columns('trades') tabs = get_table_names_for_table(inspector, 'trades') table_back_name = get_backup_name(tabs, 'trades_bak') order_tabs = get_table_names_for_table(inspector, 'orders') order_table_bak_name = get_backup_name(order_tabs, 'orders_bak') # Check if migration necessary # Migrates both trades and orders table! if not has_column(cols, 'buy_tag'): logger.info(f"Running database migration for trades - " f"backup: {table_back_name}, {order_table_bak_name}") migrate_trades_and_orders_table( decl_base, inspector, engine, table_back_name, cols, order_table_bak_name) # Reread columns - the above recreated the table! inspector = inspect(engine) cols = inspector.get_columns('trades') if 'orders' not in previous_tables and 'trades' in previous_tables: logger.info('Moving open orders to Orders table.') migrate_open_orders_to_trades(engine) set_sqlite_to_wal(engine)