stable/freqtrade/rpc/fiat_convert.py

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"""
Module that define classes to convert Crypto-currency to FIAT
e.g BTC to USD
"""
import datetime
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import logging
from typing import Dict, List
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from cachetools import TTLCache
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from pycoingecko import CoinGeckoAPI
from requests.exceptions import RequestException
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from freqtrade.constants import SUPPORTED_FIAT
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logger = logging.getLogger(__name__)
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class CryptoToFiatConverter:
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"""
Main class to initiate Crypto to FIAT.
This object contains a list of pair Crypto, FIAT
This object is also a Singleton
"""
__instance = None
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_coingekko: CoinGeckoAPI = None
_coinlistings: List[Dict] = []
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_backoff: float = 0.0
def __new__(cls):
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"""
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This class is a singleton - cannot be instantiated twice.
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"""
if CryptoToFiatConverter.__instance is None:
CryptoToFiatConverter.__instance = object.__new__(cls)
try:
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CryptoToFiatConverter._coingekko = CoinGeckoAPI()
except BaseException:
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CryptoToFiatConverter._coingekko = None
return CryptoToFiatConverter.__instance
def __init__(self) -> None:
# Timeout: 6h
self._pair_price: TTLCache = TTLCache(maxsize=500, ttl=6 * 60 * 60)
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self._load_cryptomap()
def _load_cryptomap(self) -> None:
try:
# Use list-comprehension to ensure we get a list.
self._coinlistings = [x for x in self._coingekko.get_coins_list()]
except RequestException as request_exception:
if "429" in str(request_exception):
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logger.warning(
"Too many requests for Coingecko API, backing off and trying again later.")
# Set backoff timestamp to 60 seconds in the future
self._backoff = datetime.datetime.now().timestamp() + 60
return
# If the request is not a 429 error we want to raise the normal error
logger.error(
"Could not load FIAT Cryptocurrency map for the following problem: {}".format(
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request_exception
)
)
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except (Exception) as exception:
logger.error(
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f"Could not load FIAT Cryptocurrency map for the following problem: {exception}")
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def _get_gekko_id(self, crypto_symbol):
if not self._coinlistings:
if self._backoff <= datetime.datetime.now().timestamp():
self._load_cryptomap()
# Still not loaded.
if not self._coinlistings:
return None
else:
return None
found = [x for x in self._coinlistings if x['symbol'] == crypto_symbol]
if len(found) == 1:
return found[0]['id']
if len(found) > 0:
# Wrong!
logger.warning(f"Found multiple mappings in goingekko for {crypto_symbol}.")
return None
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def convert_amount(self, crypto_amount: float, crypto_symbol: str, fiat_symbol: str) -> float:
"""
Convert an amount of crypto-currency to fiat
:param crypto_amount: amount of crypto-currency to convert
:param crypto_symbol: crypto-currency used
:param fiat_symbol: fiat to convert to
:return: float, value in fiat of the crypto-currency amount
"""
if crypto_symbol == fiat_symbol:
return float(crypto_amount)
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price = self.get_price(crypto_symbol=crypto_symbol, fiat_symbol=fiat_symbol)
return float(crypto_amount) * float(price)
def get_price(self, crypto_symbol: str, fiat_symbol: str) -> float:
"""
Return the price of the Crypto-currency in Fiat
:param crypto_symbol: Crypto-currency you want to convert (e.g BTC)
:param fiat_symbol: FIAT currency you want to convert to (e.g USD)
:return: Price in FIAT
"""
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crypto_symbol = crypto_symbol.lower()
fiat_symbol = fiat_symbol.lower()
inverse = False
if crypto_symbol == 'usd':
# usd corresponds to "uniswap-state-dollar" for coingecko.
# We'll therefore need to "swap" the currencies
logger.info(f"reversing Rates {crypto_symbol}, {fiat_symbol}")
crypto_symbol = fiat_symbol
fiat_symbol = 'usd'
inverse = True
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symbol = f"{crypto_symbol}/{fiat_symbol}"
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# Check if the fiat conversion you want is supported
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if not self._is_supported_fiat(fiat=fiat_symbol):
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raise ValueError(f'The fiat {fiat_symbol} is not supported.')
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price = self._pair_price.get(symbol, None)
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if not price:
price = self._find_price(
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crypto_symbol=crypto_symbol,
fiat_symbol=fiat_symbol
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)
if inverse and price != 0.0:
price = 1 / price
self._pair_price[symbol] = price
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return price
def _is_supported_fiat(self, fiat: str) -> bool:
"""
Check if the FIAT your want to convert to is supported
:param fiat: FIAT to check (e.g USD)
:return: bool, True supported, False not supported
"""
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return fiat.upper() in SUPPORTED_FIAT
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def _find_price(self, crypto_symbol: str, fiat_symbol: str) -> float:
"""
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Call CoinGekko API to retrieve the price in the FIAT
:param crypto_symbol: Crypto-currency you want to convert (e.g btc)
:param fiat_symbol: FIAT currency you want to convert to (e.g usd)
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:return: float, price of the crypto-currency in Fiat
"""
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# Check if the fiat conversion you want is supported
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if not self._is_supported_fiat(fiat=fiat_symbol):
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raise ValueError(f'The fiat {fiat_symbol} is not supported.')
# No need to convert if both crypto and fiat are the same
if crypto_symbol == fiat_symbol:
return 1.0
_gekko_id = self._get_gekko_id(crypto_symbol)
if not _gekko_id:
# return 0 for unsupported stake currencies (fiat-convert should not break the bot)
logger.warning("unsupported crypto-symbol %s - returning 0.0", crypto_symbol)
return 0.0
try:
return float(
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self._coingekko.get_price(
ids=_gekko_id,
vs_currencies=fiat_symbol
)[_gekko_id][fiat_symbol]
)
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except Exception as exception:
logger.error("Error in _find_price: %s", exception)
return 0.0