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124 lines
4.0 KiB
Python
124 lines
4.0 KiB
Python
#!/usr/bin/env python3
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"""Updates maxfee_kb in given JSON coin definitions."""
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import glob
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import json
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import logging
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import math
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import os.path
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import re
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import sys
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import click
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import coin_info
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import marketcap
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DEFAULT_SKIP_RE = (
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r"^Bitcoin$",
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r"^Regtest$",
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r"Testnet",
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)
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MAX_DELTA_PERCENT = 25
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def round_sats(sats, precision=1):
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"""
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Truncates `sats` down to a number with more trailing zeros.
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The result is comprised of `precision`+1 of leading digits followed by rest of zeros.
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>>> round_sats(123456789, precision=2)
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123000000
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>>> round_sats(123456789, precision=0)
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100000000
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"""
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exp = math.floor(math.log10(sats))
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div = 10 ** (exp - precision)
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return sats // div * div
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def compute_maxfee(maxcost, price, txsize):
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coins_per_tx = maxcost / price
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sats_per_tx = coins_per_tx * 10**8
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tx_per_kb = 1024.0 / txsize
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sats_per_kb = sats_per_tx * tx_per_kb
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return int(sats_per_kb)
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def delta_percent(old, new):
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return int(abs(new - old) / old * 100.0)
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def setup_logging(verbose):
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log_level = logging.DEBUG if verbose else logging.WARNING
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root = logging.getLogger()
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root.setLevel(log_level)
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handler = logging.StreamHandler(sys.stdout)
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handler.setLevel(log_level)
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root.addHandler(handler)
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@click.command()
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# fmt: off
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@click.argument("filename", nargs=-1, type=click.Path(writable=True))
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@click.option("-m", "--cost", type=float, default=10.0, show_default=True, help="Maximum transaction fee in USD")
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@click.option("-s", "--txsize", type=int, default=250, show_default=True, help="Transaction size in bytes")
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@click.option("-S", "--skip", type=str, multiple=True, help="Regex of coin name to skip, can be used multiple times")
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@click.option("-r", "--refresh", "refresh", flag_value=True, default=None, help="Force refresh market cap info")
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@click.option("-R", "--no-refresh", "refresh", flag_value=False, default=None, help="Force use cached market cap info")
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@click.option("-A", "--api-key", required=True, envvar="COINMARKETCAP_API_KEY", help="Coinmarketcap API key")
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@click.option("-v", "--verbose", is_flag=True, help="Display more info")
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# fmt: on
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def main(filename, cost, skip, txsize, refresh, api_key, verbose):
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"""
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Updates maxfee_kb in JSON coin definitions.
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The new value is calculated from the --cost argument which specifies maximum
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transaction fee in fiat denomination. The fee is converted to coin value
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using current price data. Then per-kilobyte fee is computed using given
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transaction size.
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If no filenames are provided, all definitions except Bitcoin and testnets
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are updated.
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"""
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setup_logging(verbose)
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marketcap.init(api_key, refresh=refresh)
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if len(filename) > 0:
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coin_files = filename
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else:
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coin_files = glob.glob(os.path.join(coin_info.DEFS_DIR, "bitcoin", "*.json"))
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if len(skip) == 0:
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skip = DEFAULT_SKIP_RE
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for filename in sorted(coin_files):
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coin = coin_info.load_json(filename)
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short = coin["coin_shortcut"]
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if any(re.search(s, coin["coin_name"]) is not None for s in skip):
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logging.warning(f"{short}:\tskipping because --skip matches")
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continue
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price = marketcap.fiat_price(short)
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if price is None:
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logging.error(f"{short}:\tno price data, skipping")
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continue
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old_maxfee_kb = coin["maxfee_kb"]
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new_maxfee_kb = round_sats(compute_maxfee(cost, price, txsize))
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if old_maxfee_kb != new_maxfee_kb:
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coin["maxfee_kb"] = new_maxfee_kb
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with open(filename, "w") as fh:
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json.dump(coin, fh, indent=2)
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fh.write("\n")
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logging.info(f"{short}:\tupdated {old_maxfee_kb} -> {new_maxfee_kb}")
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delta = delta_percent(old_maxfee_kb, new_maxfee_kb)
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if delta > MAX_DELTA_PERCENT:
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logging.warning(f"{short}:\tprice has changed by {delta} %")
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else:
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logging.info(f"{short}:\tno change")
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if __name__ == "__main__":
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main()
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