stable/persistence.py

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from datetime import datetime
from sqlalchemy import Boolean, Column, DateTime, Float, Integer, String, create_engine
from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm.scoping import scoped_session
from sqlalchemy.orm.session import sessionmaker
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from sqlalchemy.types import Enum
import exchange
_db_handle = None
_session = None
_conf = {}
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Base = declarative_base()
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def init(config: dict) -> None:
"""
Initializes this module with the given config,
registers all known command handlers
and starts polling for message updates
:param config: config to use
:return: None
"""
global _db_handle, _session
_conf.update(config)
if _conf.get('dry_run', False):
_db_handle = 'sqlite:///tradesv2.dry_run.sqlite'
else:
_db_handle = 'sqlite:///tradesv2.sqlite'
engine = create_engine(_db_handle, echo=False)
_session = scoped_session(sessionmaker(bind=engine, autoflush=True, autocommit=True))
Trade.session = _session()
Trade.query = _session.query_property()
Base.metadata.create_all(engine)
def get_session():
return _session
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class Trade(Base):
__tablename__ = 'trades'
id = Column(Integer, primary_key=True)
exchange = Column(Enum(exchange.Exchange), nullable=False)
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pair = Column(String, nullable=False)
is_open = Column(Boolean, nullable=False, default=True)
open_rate = Column(Float, nullable=False)
close_rate = Column(Float)
close_profit = Column(Float)
btc_amount = Column(Float, nullable=False)
amount = Column(Float, nullable=False)
open_date = Column(DateTime, nullable=False, default=datetime.utcnow)
close_date = Column(DateTime)
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open_order_id = Column(String)
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def __repr__(self):
return 'Trade(id={}, pair={}, amount={}, open_rate={}, open_since={})'.format(
self.id,
self.pair,
self.amount,
self.open_rate,
'closed' if not self.is_open else round((datetime.utcnow() - self.open_date).total_seconds() / 60, 2)
)
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def exec_sell_order(self, rate: float, amount: float) -> float:
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"""
Executes a sell for the given trade and updated the entity.
:param rate: rate to sell for
:param amount: amount to sell
:return: current profit as percentage
"""
profit = 100 * ((rate - self.open_rate) / self.open_rate)
# Execute sell and update trade record
order_id = exchange.sell(str(self.pair), rate, amount)
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self.close_rate = rate
self.close_profit = profit
self.close_date = datetime.utcnow()
self.open_order_id = order_id
return profit