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https://github.com/trezor/trezor-firmware.git
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101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
#!/usr/bin/env python3
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"""Fetch market capitalization data."""
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import json
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import os
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import time
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import requests
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COINMAKETCAP_CACHE = os.path.join(os.path.dirname(__file__), "coinmarketcap.json")
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COINMARKETCAP_API_BASE = "https://pro-api.coinmarketcap.com/v1/"
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MARKET_CAPS = {}
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PRICES = {}
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def call(endpoint, api_key, params=None):
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url = COINMARKETCAP_API_BASE + endpoint
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r = requests.get(url, params=params, headers={"X-CMC_PRO_API_KEY": api_key})
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r.raise_for_status()
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return r.json()
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def init(api_key, refresh=None):
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global MARKET_CAPS, PRICES
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force_refresh = refresh is True
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disable_refresh = refresh is False
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try:
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try:
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mtime = os.path.getmtime(COINMAKETCAP_CACHE)
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except FileNotFoundError:
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mtime = 0
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cache_is_fresh = mtime > time.time() - 3600
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if disable_refresh or (cache_is_fresh and not force_refresh):
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print("Using cached market cap data")
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with open(COINMAKETCAP_CACHE) as f:
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coinmarketcap_data = json.load(f)
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else:
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print("Fetching market cap data")
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coinmarketcap_data = call(
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"cryptocurrency/listings/latest",
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api_key,
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params={"limit": 5000, "convert": "USD"},
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)
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by_id = {str(coin["id"]): coin for coin in coinmarketcap_data["data"]}
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all_ids = list(by_id.keys())
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while all_ids:
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first_100 = all_ids[:100]
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all_ids = all_ids[100:]
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time.sleep(2.2)
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print("Fetching metadata, {} coins remaining...".format(len(all_ids)))
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metadata = call(
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"cryptocurrency/info", api_key, params={"id": ",".join(first_100)}
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)
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for coin_id, meta in metadata["data"].items():
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by_id[coin_id]["meta"] = meta
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with open(COINMAKETCAP_CACHE, "w") as f:
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json.dump(coinmarketcap_data, f)
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except Exception as e:
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raise RuntimeError("market cap data unavailable") from e
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cap_data = {}
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price_data = {}
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for coin in coinmarketcap_data["data"]:
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slug = coin["slug"]
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symbol = coin["symbol"]
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platform = coin["meta"]["platform"]
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market_cap = coin["quote"]["USD"]["market_cap"]
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price = coin["quote"]["USD"]["price"]
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if market_cap is not None:
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cap_data[slug] = cap_data[symbol] = int(market_cap)
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price_data[symbol] = price
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if platform is not None and platform["name"] == "Ethereum":
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address = platform["token_address"].lower()
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cap_data[address] = int(market_cap)
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price_data[symbol] = price
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MARKET_CAPS = cap_data
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PRICES = price_data
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def marketcap(coin):
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cap = None
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if coin["type"] == "erc20":
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address = coin["address"].lower()
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return MARKET_CAPS.get(address)
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if "coinmarketcap_alias" in coin:
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cap = MARKET_CAPS.get(coin["coinmarketcap_alias"])
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if cap is None:
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slug = coin["name"].replace(" ", "-").lower()
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cap = MARKET_CAPS.get(slug)
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if cap is None:
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cap = MARKET_CAPS.get(coin["shortcut"].lower())
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return cap
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def fiat_price(coin_symbol):
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return PRICES.get(coin_symbol)
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