The back-end websocket server for wowlet.
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# SPDX-License-Identifier: BSD-3-Clause
# Copyright (c) 2020, The Monero Project.
# Copyright (c) 2020, dsc@xmr.pm
from typing import List, Union
import settings
from wowlet_backend.utils import httpget
from wowlet_backend.tasks import FeatherTask
class CryptoRatesTask(FeatherTask):
def __init__(self, interval: int = 180):
super(CryptoRatesTask, self).__init__(interval)
self._cache_key = "crypto_rates"
self._cache_expiry = self.interval * 10
self._websocket_cmd = "crypto_rates"
self._http_api_gecko = "https://api.coingecko.com/api/v3"
async def task(self) -> Union[List[dict], None]:
"""Fetch USD prices for various coins"""
from wowlet_backend.factory import app
url = f"{self._http_api_gecko}/coins/markets?vs_currency=usd"
rates = await httpget(url, json=True)
# normalize object, too many useless keys
rates = [{
"id": r["id"],
"symbol": r["symbol"],
"image": r["image"],
"name": r["name"],
"current_price": r["current_price"],
"price_change_percentage_24h": r["price_change_percentage_24h"]
} for r in rates]
# additional coins as defined by `settings.CRYPTO_RATES_COINS_EXTRA`
for coin, symbol in settings.CRYPTO_RATES_COINS_EXTRA.items():
url = f"{self._http_api_gecko}/simple/price?ids={coin}&vs_currencies=usd"
try:
data = await httpget(url, json=True)
if coin not in data or "usd" not in data[coin]:
continue
rates.append({
"id": coin,
"symbol": symbol,
"image": "",
"name": coin.capitalize(),
"current_price": data[coin]["usd"],
"price_change_percentage_24h": 0.0
})
except Exception as ex:
app.logger.error(f"extra coin: {coin}; {ex}")
return rates