67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
"""
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This module contains the class to persist trades into SQLite
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"""
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import logging
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from typing import Any, Dict
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from sqlalchemy import create_engine, inspect
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from sqlalchemy.exc import NoSuchModuleError
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from sqlalchemy.orm import scoped_session, sessionmaker
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from sqlalchemy.pool import StaticPool
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from freqtrade.exceptions import OperationalException
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from freqtrade.persistence.base import ModelBase
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from freqtrade.persistence.migrations import check_migrate
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from freqtrade.persistence.pairlock import PairLock
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from freqtrade.persistence.trade_model import Order, Trade
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logger = logging.getLogger(__name__)
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_SQL_DOCS_URL = 'http://docs.sqlalchemy.org/en/latest/core/engines.html#database-urls'
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def init_db(db_url: str) -> None:
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"""
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Initializes this module with the given config,
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registers all known command handlers
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and starts polling for message updates
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:param db_url: Database to use
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:return: None
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"""
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kwargs: Dict[str, Any] = {}
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if db_url == 'sqlite:///':
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raise OperationalException(
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f'Bad db-url {db_url}. For in-memory database, please use `sqlite://`.')
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if db_url == 'sqlite://':
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kwargs.update({
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'poolclass': StaticPool,
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})
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# Take care of thread ownership
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if db_url.startswith('sqlite://'):
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kwargs.update({
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'connect_args': {'check_same_thread': False},
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})
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try:
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engine = create_engine(db_url, future=True, **kwargs)
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except NoSuchModuleError:
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raise OperationalException(f"Given value for db_url: '{db_url}' "
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f"is no valid database URL! (See {_SQL_DOCS_URL})")
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# https://docs.sqlalchemy.org/en/13/orm/contextual.html#thread-local-scope
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# Scoped sessions proxy requests to the appropriate thread-local session.
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# We should use the scoped_session object - not a seperately initialized version
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Trade.session = scoped_session(sessionmaker(bind=engine, autoflush=False))
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Order.session = Trade.session
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PairLock.session = Trade.session
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Trade.query = Trade.session.query_property()
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Order.query = Trade.session.query_property()
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PairLock.query = Trade.session.query_property()
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previous_tables = inspect(engine).get_table_names()
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ModelBase.metadata.create_all(engine)
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check_migrate(engine, decl_base=ModelBase, previous_tables=previous_tables)
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