core/bfxbot/bfxwrapper.py

from bfxapi.rest.bfx_rest import BfxRest
from retrying_async import retry

from bfxbot.currency import TradingPair, Balance, WalletKind, OrderType, Direction, Currency, BalanceGroup, Symbol
from bfxbot.utils import average


class BfxWrapper(BfxRest):
    # default timeframe (in milliseconds) when retrieving old prices
    DEFAULT_TIME_DELTA = 5 * 60 * 1000

    def __init__(self, api_key: str, api_secret: str):
        super().__init__(API_KEY=api_key, API_SECRET=api_secret)

    #######################################
    # OVERRIDDEN METHODS TO IMPLEMENT RETRY
    #######################################

    @retry()
    async def get_public_ticker(self, symbol):
        if isinstance(symbol, TradingPair):
            symbol = str(symbol)

        return await super().get_public_ticker(symbol)

    @retry()
    async def get_active_position(self):
        return await super().get_active_position()

    @retry()
    async def get_active_orders(self, symbol):
        if isinstance(symbol, TradingPair):
            symbol = str(symbol)

        return await super().get_active_orders(symbol)

    @retry()
    async def get_trades(self, symbol, start, end):
        if isinstance(symbol, TradingPair):
            symbol = str(symbol)

        return await super().get_trades(symbol, start, end)

    @retry()
    async def post(self, endpoint: str, data=None, params=""):
        if data is None:
            data = {}
        return await super().post(endpoint, data, params)

    ################################
    # NEW METHODS
    ################################

    async def account_movements_between(self, start: int, end: int, ledger, quote: Symbol) -> BalanceGroup:
        movements = BalanceGroup(quote)

        # TODO: Parallelize this
        for entry in filter(lambda x: start <= x[3] <= end, ledger):
            description: str = entry[8]
            currency = entry[1]
            amount = entry[5]
            time = entry[3]

            if not description.lower().startswith("deposit"):
                continue

            trading_pair = f"t{currency}{quote}"
            start_time = time - self.DEFAULT_TIME_DELTA
            end_time = time + self.DEFAULT_TIME_DELTA

            if currency != str(quote):
                trades = await self.get_public_trades(symbol=trading_pair, start=start_time, end=end_time)
                currency_price = average(list(map(lambda x: x[3], trades)))

                c = Currency(currency, amount, currency_price)
            else:
                c = Currency(currency, amount)

            b = Balance(c, quote)

            movements.add_balance(b)

        return movements

    async def balance_at(self, time: int, ledger, quote: Symbol):
        bg = BalanceGroup(quote)

        # TODO: Parallelize this
        for entry in filter(lambda x: x[3] <= time, ledger):
            currency = entry[1]
            amount = entry[6]

            if currency in bg.currency_names():
                continue

            trading_pair = f"t{currency}{quote}"
            start_time = time - self.DEFAULT_TIME_DELTA
            end_time = time + self.DEFAULT_TIME_DELTA


            if currency != str(quote):
                trades = await self.get_public_trades(symbol=trading_pair, start=start_time, end=end_time)
                currency_price = average(list(map(lambda x: x[3], trades)))

                c = Currency(currency, amount, currency_price)
            else:
                c = Currency(currency, amount)

            b = Balance(c, quote)

            bg.add_balance(b)

        return bg

    # Calculate the average execution price for Trading or rate for Margin funding.
    async def calculate_execution_price(self, pair: str, amount: float):
        api_path = "/calc/trade/avg"

        res = await self.post(api_path, {
            'symbol': pair,
            'amount': amount
        })

        return res[0]

    async def get_account_information(self):
        api_path = "auth/r/info/user"

        return await self.post(api_path)

    async def get_current_balances(self, quote: Symbol) -> BalanceGroup:
        bg: BalanceGroup = BalanceGroup(quote)

        wallets = await self.get_wallets()

        for w in wallets:
            kind = WalletKind.from_str(w.type)

            if not kind:
                continue

            execution_price = await self.calculate_execution_price(f"t{w.currency}{quote}", w.balance)
            c = Currency(w.currency, w.balance, execution_price)
            b = Balance(c, quote, kind)

            bg.add_balance(b)

        return bg

    async def get_current_prices(self, symbol: TradingPair) -> (float, float, float):
        if isinstance(symbol, TradingPair):
            symbol = str(symbol)

        tickers = await self.get_public_ticker(symbol)

        bid_price = tickers[0]
        ask_price = tickers[2]
        ticker_price = tickers[6]

        return bid_price, ask_price, ticker_price

    async def ledger_history(self, start, end):
        def chunks(lst):
            for i in range(len(lst) - 1):
                yield lst[i:i + 2]

        def get_timeframes(start, end, increments=10):
            start = int(start)
            end = int(end)

            delta = int((end - start) / increments)

            return [x for x in range(start, end, delta)]

        api_path = "auth/r/ledgers/hist"

        history = []

        # TODO: Parallelize this
        for c in chunks(get_timeframes(start, end)):
            history.extend(await self.post(api_path, {'start': c[0], 'end': c[1], 'limit': 2500}))

        history.sort(key=lambda ledger_entry: ledger_entry[3], reverse=True)

        return history

    async def maximum_order_amount(self, symbol: TradingPair, direction: Direction,
                                   order_type: OrderType = OrderType.EXCHANGE,
                                   rate: int = 1):
        api_path = "auth/calc/order/avail"

        return await self.post(api_path,
                               {'symbol': str(symbol), 'type': order_type.value, "dir": direction.value, "rate": rate})

    async def profit_loss(self, start: int, end: int, ledger, quote: Symbol):
        if start > end:
            raise ValueError

        start_bg = await self.balance_at(start, ledger, quote)
        end_bg = await self.balance_at(end, ledger, quote)
        movements_bg = await self.account_movements_between(start, end, ledger, quote)

        start_quote = start_bg.quote_equivalent()
        end_quote = end_bg.quote_equivalent()
        movements_quote = movements_bg.quote_equivalent()

        profit_loss = end_quote - (start_quote + movements_quote)

        profit_loss_percentage = profit_loss / (start_quote + movements_quote) * 100


        return profit_loss, profit_loss_percentage