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562 lines
26 KiB
562 lines
26 KiB
#! /usr/bin/env python |
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from __future__ import print_function |
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|
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import base64 |
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import pprint |
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import random |
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import sys |
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import time |
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import copy |
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|
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import btc |
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from client.configure import jm_single, get_p2pk_vbyte, donation_address |
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from base.support import get_log |
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from client.support import calc_cj_fee, weighted_order_choose, choose_orders |
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from client.wallet import estimate_tx_fee |
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from client.podle import (generate_podle, get_podle_commitments, |
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PoDLE, PoDLEError) |
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jlog = get_log() |
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|
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class JMTakerError(Exception): |
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pass |
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|
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#Taker is now a class to do 1 coinjoin |
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class Taker(object): |
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|
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def __init__(self, |
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wallet, |
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mixdepth, |
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amount, |
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n_counterparties, |
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order_chooser=weighted_order_choose, |
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external_addr=None, |
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sign_method=None, |
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callbacks=None): |
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self.wallet = wallet |
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self.mixdepth = mixdepth |
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self.cjamount = amount |
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self.my_cj_addr = external_addr |
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self.order_chooser = order_chooser |
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self.n_counterparties = n_counterparties |
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self.ignored_makers = None |
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self.outputs = [] |
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self.cjfee_total = 0 |
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self.maker_txfee_contributions = 0 |
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self.txfee_default = 5000 |
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self.txid = None |
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#allow custom wallet-based clients to use their own signing code; |
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#currently only setting "wallet" is allowed, calls wallet.sign_tx(tx) |
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self.sign_method = sign_method |
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if callbacks: |
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self.filter_orders_callback, self.taker_info_callback = callbacks |
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else: |
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self.filter_orders_callback = None |
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self.taker_info_callback = self.default_taker_info_callback |
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|
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def default_taker_info_callback(self, infotype, msg): |
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jlog.debug(infotype + ":" + msg) |
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|
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def initialize(self, orderbook): |
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"""Once the daemon is active and has returned the current orderbook, |
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select offers and prepare a commitment, then send it to the protocol |
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to fill offers. |
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""" |
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if not self.filter_orderbook(orderbook): |
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return (False,) |
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#choose coins to spend |
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if not self.prepare_my_bitcoin_data(): |
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return (False,) |
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#Prepare a commitment |
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commitment, revelation, errmsg = self.make_commitment() |
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if not commitment: |
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self.taker_info_callback("ABORT", errmsg) |
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return (False,) |
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else: |
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self.taker_info_callback("INFO", errmsg) |
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return (True, self.cjamount, commitment, revelation, self.orderbook) |
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|
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def filter_orderbook(self, orderbook): |
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self.orderbook, self.total_cj_fee = choose_orders( |
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orderbook, self.cjamount, self.n_counterparties, self.order_chooser, |
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self.ignored_makers) |
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if self.filter_orders_callback: |
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accepted = self.filter_orders_callback([self.orderbook, |
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self.total_cj_fee]) |
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if not accepted: |
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return False |
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return True |
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|
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def prepare_my_bitcoin_data(self): |
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"""Get a coinjoin address and a change address; prepare inputs |
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appropriate for this transaction""" |
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if not self.my_cj_addr: |
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try: |
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self.my_cj_addr = self.wallet.get_external_addr(self.mixdepth + 1) |
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except: |
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self.taker_info_callback("ABORT", "Failed to get an address") |
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return False |
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self.my_change_addr = None |
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if self.cjamount != 0: |
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try: |
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self.my_change_addr = self.wallet.get_internal_addr(self.mixdepth) |
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except: |
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self.taker_info_callback("ABORT", "Failed to get a change address") |
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return False |
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#TODO sweep, doesn't apply here |
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self.total_txfee = 2 * self.txfee_default * self.n_counterparties |
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total_amount = self.cjamount + self.total_cj_fee + self.total_txfee |
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jlog.debug('total estimated amount spent = ' + str(total_amount)) |
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#adjust the required amount upwards to anticipate an increase in |
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#transaction fees after re-estimation; this is sufficiently conservative |
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#to make failures unlikely while keeping the occurence of failure to |
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#find sufficient utxos extremely rare. Indeed, a doubling of 'normal' |
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#txfee indicates undesirable behaviour on maker side anyway. |
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try: |
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self.input_utxos = self.wallet.select_utxos(self.mixdepth, |
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total_amount) |
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except Exception as e: |
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self.taker_info_callback("ABORT", |
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"Unable to select sufficient coins: " + repr(e)) |
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return False |
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self.utxos = {None: self.input_utxos.keys()} |
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return True |
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|
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def receive_utxos(self, ioauth_data): |
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"""Triggered when the daemon returns utxo data from |
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makers who responded; this is the completion of phase 1 |
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of the protocol |
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""" |
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rejected_counterparties = [] |
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#Enough data, but need to authorize against the btc pubkey first. |
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for nick, nickdata in ioauth_data.iteritems(): |
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utxo_list, auth_pub, cj_addr, change_addr, btc_sig, maker_pk = nickdata |
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if not self.auth_counterparty(btc_sig, auth_pub, maker_pk): |
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print("Counterparty encryption verification failed, aborting") |
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#This counterparty must be rejected |
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rejected_counterparties.append(nick) |
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|
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for rc in rejected_counterparties: |
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del ioauth_data[rc] |
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|
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self.maker_utxo_data = {} |
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|
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for nick, nickdata in ioauth_data.iteritems(): |
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utxo_list, auth_pub, cj_addr, change_addr, btc_sig, maker_pk = nickdata |
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self.utxos[nick] = utxo_list |
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utxo_data = jm_single().bc_interface.query_utxo_set(self.utxos[ |
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nick]) |
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if None in utxo_data: |
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jlog.debug(('ERROR outputs unconfirmed or already spent. ' |
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'utxo_data={}').format(pprint.pformat(utxo_data))) |
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# when internal reviewing of makers is created, add it here to |
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# immediately quit; currently, the timeout thread suffices. |
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continue |
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|
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#Complete maker authorization: |
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#Extract the address fields from the utxos |
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#Construct the Bitcoin address for the auth_pub field |
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#Ensure that at least one address from utxos corresponds. |
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input_addresses = [d['address'] for d in utxo_data] |
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auth_address = btc.pubkey_to_address(auth_pub, get_p2pk_vbyte()) |
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if not auth_address in input_addresses: |
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jlog.warn("ERROR maker's (" + nick + ")" |
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" authorising pubkey is not included " |
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"in the transaction: " + str(auth_address)) |
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#this will not be added to the transaction, so we will have |
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#to recheck if we have enough |
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continue |
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total_input = sum([d['value'] for d in utxo_data]) |
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real_cjfee = calc_cj_fee(self.orderbook[nick]['ordertype'], |
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self.orderbook[nick]['cjfee'], |
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self.cjamount) |
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change_amount = (total_input - self.cjamount - |
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self.orderbook[nick]['txfee'] + real_cjfee) |
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|
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# certain malicious and/or incompetent liquidity providers send |
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# inputs totalling less than the coinjoin amount! this leads to |
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# a change output of zero satoshis; this counterparty must be removed. |
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if change_amount < jm_single().DUST_THRESHOLD: |
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fmt = ('ERROR counterparty requires sub-dust change. nick={}' |
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'totalin={:d} cjamount={:d} change={:d}').format |
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jlog.debug(fmt(nick, total_input, self.cjamount, change_amount)) |
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jlog.warn("Invalid change, too small, nick= " + nick) |
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continue |
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self.outputs.append({'address': change_addr, |
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'value': change_amount}) |
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fmt = ('fee breakdown for {} totalin={:d} ' |
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'cjamount={:d} txfee={:d} realcjfee={:d}').format |
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jlog.debug(fmt(nick, total_input, self.cjamount, self.orderbook[ |
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nick]['txfee'], real_cjfee)) |
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self.outputs.append({'address': cj_addr, 'value': self.cjamount}) |
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self.cjfee_total += real_cjfee |
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self.maker_txfee_contributions += self.orderbook[nick]['txfee'] |
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self.maker_utxo_data[nick] = utxo_data |
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|
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#Apply business logic of how many counterparties are enough: |
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if len(self.maker_utxo_data.keys()) < jm_single().config.getint( |
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"POLICY", "minimum_makers"): |
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return (False, |
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"Not enough counterparties responded to fill, giving up") |
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|
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jlog.info('got all parts, enough to build a tx') |
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self.nonrespondants = list(self.maker_utxo_data.keys()) |
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|
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my_total_in = sum([va['value'] for u, va in self.input_utxos.iteritems() |
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]) |
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if self.my_change_addr: |
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#Estimate fee per choice of next/3/6 blocks targetting. |
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estimated_fee = estimate_tx_fee( |
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len(sum(self.utxos.values(), [])), len(self.outputs) + 2) |
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jlog.info("Based on initial guess: " + str(self.total_txfee) + |
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", we estimated a miner fee of: " + str(estimated_fee)) |
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#reset total |
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self.total_txfee = estimated_fee |
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my_txfee = max(self.total_txfee - self.maker_txfee_contributions, 0) |
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my_change_value = ( |
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my_total_in - self.cjamount - self.cjfee_total - my_txfee) |
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#Since we could not predict the maker's inputs, we may end up needing |
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#too much such that the change value is negative or small. Note that |
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#we have tried to avoid this based on over-estimating the needed amount |
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#in SendPayment.create_tx(), but it is still a possibility if one maker |
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#uses a *lot* of inputs. |
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if self.my_change_addr and my_change_value <= 0: |
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raise ValueError("Calculated transaction fee of: " + str( |
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self.total_txfee) + |
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" is too large for our inputs;Please try again.") |
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elif self.my_change_addr and my_change_value <= jm_single( |
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).BITCOIN_DUST_THRESHOLD: |
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jlog.info("Dynamically calculated change lower than dust: " + str( |
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my_change_value) + "; dropping.") |
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self.my_change_addr = None |
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my_change_value = 0 |
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jlog.info( |
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'fee breakdown for me totalin=%d my_txfee=%d makers_txfee=%d cjfee_total=%d => changevalue=%d' |
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% (my_total_in, my_txfee, self.maker_txfee_contributions, |
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self.cjfee_total, my_change_value)) |
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if self.my_change_addr is None: |
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if my_change_value != 0 and abs(my_change_value) != 1: |
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# seems you wont always get exactly zero because of integer |
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# rounding so 1 satoshi extra or fewer being spent as miner |
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# fees is acceptable |
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jlog.debug(('WARNING CHANGE NOT BEING ' |
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'USED\nCHANGEVALUE = {}').format(my_change_value)) |
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else: |
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self.outputs.append({'address': self.my_change_addr, |
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'value': my_change_value}) |
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self.utxo_tx = [dict([('output', u)]) |
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for u in sum(self.utxos.values(), [])] |
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self.outputs.append({'address': self.coinjoin_address(), |
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'value': self.cjamount}) |
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random.shuffle(self.utxo_tx) |
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random.shuffle(self.outputs) |
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tx = btc.mktx(self.utxo_tx, self.outputs) |
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jlog.debug('obtained tx\n' + pprint.pformat(btc.deserialize(tx))) |
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self.latest_tx = btc.deserialize(tx) |
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for index, ins in enumerate(self.latest_tx['ins']): |
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utxo = ins['outpoint']['hash'] + ':' + str(ins['outpoint']['index']) |
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if utxo not in self.input_utxos.keys(): |
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continue |
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# placeholders required |
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ins['script'] = 'deadbeef' |
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return (True, self.maker_utxo_data.keys(), tx) |
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|
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def auth_counterparty(self, btc_sig, auth_pub, maker_pk): |
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"""Validate the counterpartys claim to own the btc |
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address/pubkey that will be used for coinjoining |
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with an ecdsa verification. |
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""" |
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if not btc.ecdsa_verify(maker_pk, btc_sig, auth_pub): |
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jlog.debug('signature didnt match pubkey and message') |
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return False |
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return True |
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|
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def on_sig(self, nick, sigb64): |
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sig = base64.b64decode(sigb64).encode('hex') |
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inserted_sig = False |
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txhex = btc.serialize(self.latest_tx) |
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|
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# batch retrieval of utxo data |
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utxo = {} |
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ctr = 0 |
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for index, ins in enumerate(self.latest_tx['ins']): |
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utxo_for_checking = ins['outpoint']['hash'] + ':' + str(ins[ |
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'outpoint']['index']) |
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if (ins['script'] != '' or |
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utxo_for_checking in self.input_utxos.keys()): |
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continue |
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utxo[ctr] = [index, utxo_for_checking] |
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ctr += 1 |
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utxo_data = jm_single().bc_interface.query_utxo_set([x[ |
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1] for x in utxo.values()]) |
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|
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# insert signatures |
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for i, u in utxo.iteritems(): |
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if utxo_data[i] is None: |
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continue |
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sig_good = btc.verify_tx_input(txhex, u[0], utxo_data[i]['script'], |
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*btc.deserialize_script(sig)) |
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if sig_good: |
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jlog.debug('found good sig at index=%d' % (u[0])) |
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self.latest_tx['ins'][u[0]]['script'] = sig |
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inserted_sig = True |
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# check if maker has sent everything possible |
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self.utxos[nick].remove(u[1]) |
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if len(self.utxos[nick]) == 0: |
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jlog.debug(('nick = {} sent all sigs, removing from ' |
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'nonrespondant list').format(nick)) |
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self.nonrespondants.remove(nick) |
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break |
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if not inserted_sig: |
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jlog.debug('signature did not match anything in the tx') |
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# TODO what if the signature doesnt match anything |
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# nothing really to do except drop it, carry on and wonder why the |
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# other guy sent a failed signature |
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tx_signed = True |
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for ins in self.latest_tx['ins']: |
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if ins['script'] == '': |
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tx_signed = False |
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if not tx_signed: |
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return False |
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assert not len(self.nonrespondants) |
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jlog.debug('all makers have sent their signatures') |
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self.self_sign_and_push() |
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return True |
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|
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def make_commitment(self): |
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"""The Taker default commitment function, which uses PoDLE. |
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Alternative commitment types should use a different commit type byte. |
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This will allow future upgrades to provide different style commitments |
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by subclassing Taker and changing the commit_type_byte; existing makers |
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will simply not accept this new type of commitment. |
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In case of success, return the commitment and its opening. |
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In case of failure returns (None, None) and constructs a detailed |
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log for the user to read and discern the reason. |
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""" |
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|
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def filter_by_coin_age_amt(utxos, age, amt): |
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results = jm_single().bc_interface.query_utxo_set(utxos, |
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includeconf=True) |
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newresults = [] |
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too_old = [] |
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too_small = [] |
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for i, r in enumerate(results): |
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#results return "None" if txo is spent; drop this |
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if not r: |
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continue |
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valid_age = r['confirms'] >= age |
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valid_amt = r['value'] >= amt |
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if not valid_age: |
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too_old.append(utxos[i]) |
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if not valid_amt: |
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too_small.append(utxos[i]) |
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if valid_age and valid_amt: |
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newresults.append(utxos[i]) |
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return newresults, too_old, too_small |
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|
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def priv_utxo_pairs_from_utxos(utxos, age, amt): |
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#returns pairs list of (priv, utxo) for each valid utxo; |
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#also returns lists "too_old" and "too_small" for any |
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#utxos that did not satisfy the criteria for debugging. |
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priv_utxo_pairs = [] |
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new_utxos, too_old, too_small = filter_by_coin_age_amt(utxos.keys(), |
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age, amt) |
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new_utxos_dict = {k: v for k, v in utxos.items() if k in new_utxos} |
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for k, v in new_utxos_dict.iteritems(): |
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addr = v['address'] |
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priv = self.wallet.get_key_from_addr(addr) |
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if priv: #can be null from create-unsigned |
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priv_utxo_pairs.append((priv, k)) |
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return priv_utxo_pairs, too_old, too_small |
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|
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commit_type_byte = "P" |
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podle_data = None |
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tries = jm_single().config.getint("POLICY", "taker_utxo_retries") |
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age = jm_single().config.getint("POLICY", "taker_utxo_age") |
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#Minor rounding errors don't matter here |
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amt = int(self.cjamount * |
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jm_single().config.getint("POLICY", |
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"taker_utxo_amtpercent") / 100.0) |
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priv_utxo_pairs, to, ts = priv_utxo_pairs_from_utxos(self.input_utxos, |
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age, amt) |
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#Note that we ignore the "too old" and "too small" lists in the first |
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#pass through, because the same utxos appear in the whole-wallet check. |
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|
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#For podle data format see: podle.PoDLE.reveal() |
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#In first round try, don't use external commitments |
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podle_data = generate_podle(priv_utxo_pairs, tries) |
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if not podle_data: |
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#We defer to a second round to try *all* utxos in wallet; |
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#this is because it's much cleaner to use the utxos involved |
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#in the transaction, about to be consumed, rather than use |
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#random utxos that will persist after. At this step we also |
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#allow use of external utxos in the json file. |
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if self.wallet.unspent: |
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priv_utxo_pairs, to, ts = priv_utxo_pairs_from_utxos( |
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self.wallet.unspent, age, amt) |
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#Pre-filter the set of external commitments that work for this |
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#transaction according to its size and age. |
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dummy, extdict = get_podle_commitments() |
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if len(extdict.keys()) > 0: |
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ext_valid, ext_to, ext_ts = filter_by_coin_age_amt( |
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extdict.keys(), age, amt) |
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else: |
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ext_valid = None |
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podle_data = generate_podle(priv_utxo_pairs, tries, ext_valid) |
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if podle_data: |
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jlog.debug("Generated PoDLE: " + pprint.pformat(podle_data)) |
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revelation = PoDLE(u=podle_data['utxo'], |
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P=podle_data['P'], |
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P2=podle_data['P2'], |
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s=podle_data['sig'], |
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e=podle_data['e']).serialize_revelation() |
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return (commit_type_byte + podle_data["commit"], revelation, |
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"Commitment sourced OK") |
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else: |
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#we know that priv_utxo_pairs all passed age and size tests, so |
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#they must have failed the retries test. Summarize this info, |
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#return error message to caller, and also dump to commitments_debug.txt |
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errmsg = "" |
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errmsgheader = ("Failed to source a commitment; this debugging information" |
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" may help:\n\n") |
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errmsg += ("1: Utxos that passed age and size limits, but have " |
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"been used too many times (see taker_utxo_retries " |
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"in the config):\n") |
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if len(priv_utxo_pairs) == 0: |
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errmsg += ("None\n") |
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else: |
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for p, u in priv_utxo_pairs: |
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errmsg += (str(u) + "\n") |
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errmsg += ("2: Utxos that have less than " + jm_single( |
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).config.get("POLICY", "taker_utxo_age") + " confirmations:\n") |
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if len(to) == 0: |
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errmsg += ("None\n") |
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else: |
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for t in to: |
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errmsg += (str(t) + "\n") |
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errmsg += ("3: Utxos that were not at least " + \ |
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jm_single().config.get( |
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"POLICY", "taker_utxo_amtpercent") + "% of the " |
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"size of the coinjoin amount " + str( |
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self.cjamount) + "\n") |
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if len(ts) == 0: |
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errmsg += ("None\n") |
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else: |
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for t in ts: |
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errmsg += (str(t) + "\n") |
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errmsg += ('***\n') |
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errmsg += ("Utxos that appeared in item 1 cannot be used again.\n") |
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errmsg += ( |
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"Utxos only in item 2 can be used by waiting for more " |
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"confirmations, (set by the value of taker_utxo_age).\n") |
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errmsg += ("Utxos only in item 3 are not big enough for this " |
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"coinjoin transaction, set by the value " |
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"of taker_utxo_amtpercent.\n") |
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errmsg += ( |
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"If you cannot source a utxo from your wallet according " |
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"to these rules, use the tool add-utxo.py to source a " |
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"utxo external to your joinmarket wallet. Read the help " |
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"with 'python add-utxo.py --help'\n\n") |
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errmsg += ("You can also reset the rules in the joinmarket.cfg " |
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"file, but this is generally inadvisable.\n") |
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errmsg += ( |
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"***\nFor reference, here are the utxos in your wallet:\n") |
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errmsg += ("\n" + str(self.wallet.unspent)) |
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|
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with open("commitments_debug.txt", "wb") as f: |
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errmsgfileheader = ("THIS IS A TEMPORARY FILE FOR DEBUGGING; " |
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"IT CAN BE SAFELY DELETED ANY TIME.\n") |
|
errmsgfileheader += ("***\n") |
|
f.write(errmsgfileheader + errmsg) |
|
|
|
return (None, None, errmsgheader + errmsg) |
|
|
|
def get_commitment(self, utxos, amount): |
|
"""Create commitment to fulfil anti-DOS requirement of makers, |
|
storing the corresponding reveal/proof data for next step. |
|
""" |
|
while True: |
|
self.commitment, self.reveal_commitment = self.make_commitment( |
|
self.wallet, utxos, amount) |
|
if (self.commitment) or (jm_single().wait_for_commitments == 0): |
|
break |
|
jlog.debug("Failed to source commitments, waiting 3 minutes") |
|
time.sleep(3 * 60) |
|
if not self.commitment: |
|
jlog.debug( |
|
"Cannot construct transaction, failed to generate " |
|
"commitment, shutting down. Please read commitments_debug.txt " |
|
"for some information on why this is, and what can be " |
|
"done to remedy it.") |
|
#TODO: would like to raw_input here to show the user, but |
|
#interactivity is undesirable here. |
|
#Test only: |
|
if jm_single().config.get("BLOCKCHAIN", |
|
"blockchain_source") == 'regtest': |
|
raise PoDLEError("For testing raising podle exception") |
|
#The timeout/recovery code is designed to handle non-responsive |
|
#counterparties, but this condition means that the current bot |
|
#is not able to create transactions following its *own* rules, |
|
#so shutting down is appropriate no matter what style |
|
#of bot this is. |
|
#These two settings shut down the timeout thread and avoid recovery. |
|
self.all_responded = True |
|
self.end_timeout_thread = True |
|
self.msgchan.shutdown() |
|
|
|
def coinjoin_address(self): |
|
if self.my_cj_addr: |
|
return self.my_cj_addr |
|
else: |
|
addr, self.sign_k = donation_address() |
|
return addr |
|
|
|
def sign_tx(self, tx, i, priv): |
|
if self.my_cj_addr: |
|
return btc.sign(tx, i, priv) |
|
else: |
|
return btc.sign(tx, |
|
i, |
|
priv, |
|
usenonce=btc.safe_hexlify(self.sign_k)) |
|
|
|
def self_sign(self): |
|
# now sign it ourselves |
|
tx = btc.serialize(self.latest_tx) |
|
if self.sign_method == "wallet": |
|
#Currently passes addresses of to-be-signed inputs |
|
#to backend wallet; this is correct for Electrum, may need |
|
#different info for other backends. |
|
addrs = {} |
|
for index, ins in enumerate(self.latest_tx['ins']): |
|
utxo = ins['outpoint']['hash'] + ':' + str(ins['outpoint']['index']) |
|
if utxo not in self.input_utxos.keys(): |
|
continue |
|
addrs[index] = self.input_utxos[utxo]['address'] |
|
tx = self.wallet.sign_tx(btc.serialize(wallet_tx), addrs) |
|
else: |
|
for index, ins in enumerate(self.latest_tx['ins']): |
|
utxo = ins['outpoint']['hash'] + ':' + str(ins['outpoint']['index']) |
|
if utxo not in self.input_utxos.keys(): |
|
continue |
|
addr = self.input_utxos[utxo]['address'] |
|
tx = self.sign_tx(tx, index, self.wallet.get_key_from_addr(addr)) |
|
self.latest_tx = btc.deserialize(tx) |
|
|
|
def push(self): |
|
tx = btc.serialize(self.latest_tx) |
|
jlog.debug('\n' + tx) |
|
self.txid = btc.txhash(tx) |
|
jlog.debug('txid = ' + self.txid) |
|
pushed = jm_single().bc_interface.pushtx(tx) |
|
return pushed |
|
|
|
def self_sign_and_push(self): |
|
self.self_sign() |
|
return self.push()
|
|
|