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475 lines
23 KiB
475 lines
23 KiB
import threading
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from typing import Optional, NamedTuple, Iterable
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import os
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from collections import defaultdict
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from .util import PrintError, bh2u, bfh, NoDynamicFeeEstimates, aiosafe
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from .lnutil import (extract_ctn_from_tx_and_chan, derive_privkey,
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get_per_commitment_secret_from_seed, derive_pubkey,
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make_commitment_output_to_remote_address,
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RevocationStore, Outpoint)
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from . import lnutil
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from .bitcoin import redeem_script_to_address, TYPE_ADDRESS
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from . import transaction
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from .transaction import Transaction, TxOutput
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from . import ecc
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from . import wallet
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from .simple_config import SimpleConfig, FEERATE_FALLBACK_STATIC_FEE
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from .storage import WalletStorage
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from .address_synchronizer import AddressSynchronizer
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TX_MINED_STATUS_DEEP, TX_MINED_STATUS_SHALLOW, TX_MINED_STATUS_MEMPOOL, TX_MINED_STATUS_FREE = range(0, 4)
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class EncumberedTransaction(NamedTuple("EncumberedTransaction", [('tx', Transaction),
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('csv_delay', Optional[int])])):
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def to_json(self) -> dict:
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return {
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'tx': str(self.tx),
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'csv_delay': self.csv_delay,
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}
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@classmethod
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def from_json(cls, d: dict):
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d2 = dict(d)
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d2['tx'] = Transaction(d['tx'])
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return EncumberedTransaction(**d2)
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class ChannelWatchInfo(NamedTuple("ChannelWatchInfo", [('outpoint', Outpoint),
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('sweep_address', str),
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('local_pubkey', bytes),
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('remote_pubkey', bytes),
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('last_ctn_our_ctx', int),
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('last_ctn_their_ctx', int),
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('last_ctn_revoked_pcs', int)])):
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def to_json(self) -> dict:
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return {
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'outpoint': self.outpoint,
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'sweep_address': self.sweep_address,
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'local_pubkey': bh2u(self.local_pubkey),
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'remote_pubkey': bh2u(self.remote_pubkey),
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'last_ctn_our_ctx': self.last_ctn_our_ctx,
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'last_ctn_their_ctx': self.last_ctn_their_ctx,
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'last_ctn_revoked_pcs': self.last_ctn_revoked_pcs,
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}
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@classmethod
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def from_json(cls, d: dict):
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d2 = dict(d)
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d2['outpoint'] = Outpoint(*d['outpoint'])
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d2['local_pubkey'] = bfh(d['local_pubkey'])
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d2['remote_pubkey'] = bfh(d['remote_pubkey'])
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return ChannelWatchInfo(**d2)
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class LNWatcher(PrintError):
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# TODO if verifier gets an incorrect merkle proof, that tx will never verify!!
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# similarly, what if server ignores request for merkle proof?
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# maybe we should disconnect from server in these cases
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def __init__(self, network):
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self.network = network
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path = os.path.join(network.config.path, "watcher_db")
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storage = WalletStorage(path)
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self.addr_sync = AddressSynchronizer(storage)
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self.addr_sync.start_network(network)
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self.lock = threading.RLock()
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self.watched_addresses = set()
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self.channel_info = {k: ChannelWatchInfo.from_json(v)
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for k,v in storage.get('channel_info', {}).items()} # access with 'lock'
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self.funding_txo_spent_callback = {} # funding_outpoint -> callback
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# TODO structure will need to change when we handle HTLCs......
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# [funding_outpoint_str][ctx_txid] -> set of EncumberedTransaction
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# access with 'lock'
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self.sweepstore = defaultdict(lambda: defaultdict(set))
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for funding_outpoint, ctxs in storage.get('sweepstore', {}).items():
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for ctx_txid, set_of_txns in ctxs.items():
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for e_tx in set_of_txns:
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e_tx2 = EncumberedTransaction.from_json(e_tx)
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self.sweepstore[funding_outpoint][ctx_txid].add(e_tx2)
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self.network.register_callback(self.on_network_update, ['network_updated', 'blockchain_updated', 'verified'])
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def write_to_disk(self):
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# FIXME: json => every update takes linear instead of constant disk write
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with self.lock:
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storage = self.addr_sync.storage
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# self.channel_info
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channel_info = {k: v.to_json() for k,v in self.channel_info.items()}
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storage.put('channel_info', channel_info)
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# self.sweepstore
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sweepstore = {}
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for funding_outpoint, ctxs in self.sweepstore.items():
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sweepstore[funding_outpoint] = {}
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for ctx_txid, set_of_txns in ctxs.items():
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sweepstore[funding_outpoint][ctx_txid] = [e_tx.to_json() for e_tx in set_of_txns]
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storage.put('sweepstore', sweepstore)
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storage.write()
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def watch_channel(self, chan, sweep_address, callback_funding_txo_spent):
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address = chan.get_funding_address()
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self.watch_address(address)
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with self.lock:
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if address not in self.channel_info:
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self.channel_info[address] = ChannelWatchInfo(outpoint=chan.funding_outpoint,
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sweep_address=sweep_address,
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local_pubkey=chan.local_config.payment_basepoint.pubkey,
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remote_pubkey=chan.remote_config.payment_basepoint.pubkey,
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last_ctn_our_ctx=0,
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last_ctn_their_ctx=0,
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last_ctn_revoked_pcs=-1)
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self.funding_txo_spent_callback[chan.funding_outpoint] = callback_funding_txo_spent
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self.write_to_disk()
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@aiosafe
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async def on_network_update(self, event, *args):
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if event == 'verified':
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wallet = args[0]
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if wallet != self.addr_sync:
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return
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if not self.addr_sync.synchronizer:
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self.print_error("synchronizer not set yet")
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return
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if not self.addr_sync.synchronizer.is_up_to_date():
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return
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with self.lock:
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channel_info_items = list(self.channel_info.items())
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for address, info in channel_info_items:
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await self.check_onchain_situation(info.outpoint)
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def watch_address(self, addr):
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with self.lock:
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self.watched_addresses.add(addr)
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self.addr_sync.add_address(addr)
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async def check_onchain_situation(self, funding_outpoint):
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ctx_candidate_txid = self.addr_sync.spent_outpoints[funding_outpoint.txid].get(funding_outpoint.output_index)
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# call funding_txo_spent_callback if there is one
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is_funding_txo_spent = ctx_candidate_txid is not None
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cb = self.funding_txo_spent_callback.get(funding_outpoint)
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if cb: cb(is_funding_txo_spent)
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if not is_funding_txo_spent:
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return
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ctx_candidate = self.addr_sync.transactions.get(ctx_candidate_txid)
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if ctx_candidate is None:
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return
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#self.print_error("funding outpoint {} is spent by {}"
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# .format(funding_outpoint, ctx_candidate_txid))
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conf = self.addr_sync.get_tx_height(ctx_candidate_txid).conf
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# only care about confirmed and verified ctxs. TODO is this necessary?
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if conf == 0:
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return
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keep_watching_this = await self.inspect_ctx_candidate(funding_outpoint, ctx_candidate)
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if not keep_watching_this:
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self.stop_and_delete(funding_outpoint)
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def stop_and_delete(self, funding_outpoint):
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# TODO delete channel from watcher_db
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pass
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async def inspect_ctx_candidate(self, funding_outpoint, ctx):
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"""Returns True iff found any not-deeply-spent outputs that we could
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potentially sweep at some point."""
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# make sure we are subscribed to all outputs of ctx
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not_yet_watching = False
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for o in ctx.outputs():
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if o.address not in self.watched_addresses:
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self.watch_address(o.address)
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not_yet_watching = True
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if not_yet_watching:
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return True
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# get all possible responses we have
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ctx_txid = ctx.txid()
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with self.lock:
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encumbered_sweep_txns = self.sweepstore[funding_outpoint.to_str()][ctx_txid]
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if len(encumbered_sweep_txns) == 0:
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# no useful response for this channel close..
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if self.get_tx_mined_status(ctx_txid) == TX_MINED_STATUS_DEEP:
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self.print_error("channel close detected for {}. but can't sweep anything :(".format(funding_outpoint))
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return False
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# check if any response applies
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keep_watching_this = False
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local_height = self.network.get_local_height()
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for e_tx in encumbered_sweep_txns:
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conflicts = self.addr_sync.get_conflicting_transactions(e_tx.tx.txid(), e_tx.tx, include_self=True)
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conflict_mined_status = self.get_deepest_tx_mined_status_for_txids(conflicts)
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if conflict_mined_status != TX_MINED_STATUS_DEEP:
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keep_watching_this = True
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if conflict_mined_status == TX_MINED_STATUS_FREE:
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tx_height = self.addr_sync.get_tx_height(ctx_txid).height
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num_conf = local_height - tx_height + 1
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if num_conf >= e_tx.csv_delay:
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result = await self.network.broadcast_transaction(e_tx.tx)
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self.print_tx_broadcast_result(result)
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else:
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self.print_error('waiting for CSV ({} < {}) for funding outpoint {} and ctx {}'
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.format(num_conf, e_tx.csv_delay, funding_outpoint, ctx.txid()))
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return keep_watching_this
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def _get_sweep_address_for_chan(self, chan) -> str:
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funding_address = chan.get_funding_address()
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try:
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channel_info = self.channel_info[funding_address]
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except KeyError:
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# this is used during channel opening, as we only start watching
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# the channel once it gets into the "opening" state, but we need to
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# process the first ctx before that.
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return chan.sweep_address
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return channel_info.sweep_address
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def _get_last_ctn_for_processed_ctx(self, funding_address: str, ours: bool) -> int:
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try:
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ci = self.channel_info[funding_address]
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except KeyError:
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return -1
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if ours:
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return ci.last_ctn_our_ctx
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else:
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return ci.last_ctn_their_ctx
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def _inc_last_ctn_for_processed_ctx(self, funding_address: str, ours: bool) -> None:
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try:
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ci = self.channel_info[funding_address]
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except KeyError:
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return
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if ours:
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ci = ci._replace(last_ctn_our_ctx=ci.last_ctn_our_ctx + 1)
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else:
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ci = ci._replace(last_ctn_their_ctx=ci.last_ctn_their_ctx + 1)
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self.channel_info[funding_address] = ci
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def _get_last_ctn_for_revoked_secret(self, funding_address: str) -> int:
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try:
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ci = self.channel_info[funding_address]
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except KeyError:
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return -1
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return ci.last_ctn_revoked_pcs
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def _inc_last_ctn_for_revoked_secret(self, funding_address: str) -> None:
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try:
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ci = self.channel_info[funding_address]
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except KeyError:
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return
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ci = ci._replace(last_ctn_revoked_pcs=ci.last_ctn_revoked_pcs + 1)
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self.channel_info[funding_address] = ci
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# TODO batch sweeps
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# TODO sweep HTLC outputs
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def process_new_offchain_ctx(self, chan, ctx, ours: bool):
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funding_address = chan.get_funding_address()
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ctn = extract_ctn_from_tx_and_chan(ctx, chan)
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latest_ctn_on_channel = chan.local_state.ctn if ours else chan.remote_state.ctn
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last_ctn_watcher_saw = self._get_last_ctn_for_processed_ctx(funding_address, ours)
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if latest_ctn_on_channel + 1 != ctn:
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raise Exception('unexpected ctn {}. latest is {}. our ctx: {}'.format(ctn, latest_ctn_on_channel, ours))
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if last_ctn_watcher_saw + 1 != ctn:
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raise Exception('watcher skipping ctns!! ctn {}. last seen {}. our ctx: {}'.format(ctn, last_ctn_watcher_saw, ours))
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#self.print_error("process_new_offchain_ctx. funding {}, ours {}, ctn {}, ctx {}"
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# .format(chan.funding_outpoint.to_str(), ours, ctn, ctx.txid()))
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sweep_address = self._get_sweep_address_for_chan(chan)
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if ours:
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our_per_commitment_secret = get_per_commitment_secret_from_seed(
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chan.local_state.per_commitment_secret_seed, RevocationStore.START_INDEX - ctn)
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our_cur_pcp = ecc.ECPrivkey(our_per_commitment_secret).get_public_key_bytes(compressed=True)
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encumbered_sweeptx = maybe_create_sweeptx_for_our_ctx_to_local(chan, ctx, our_cur_pcp, sweep_address)
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else:
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their_cur_pcp = chan.remote_state.next_per_commitment_point
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encumbered_sweeptx = maybe_create_sweeptx_for_their_ctx_to_remote(chan, ctx, their_cur_pcp, sweep_address)
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self.add_to_sweepstore(chan.funding_outpoint.to_str(), ctx.txid(), encumbered_sweeptx)
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self._inc_last_ctn_for_processed_ctx(funding_address, ours)
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self.write_to_disk()
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def process_new_revocation_secret(self, chan, per_commitment_secret: bytes):
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funding_address = chan.get_funding_address()
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ctx = chan.remote_commitment_to_be_revoked
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ctn = extract_ctn_from_tx_and_chan(ctx, chan)
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latest_ctn_on_channel = chan.remote_state.ctn
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last_ctn_watcher_saw = self._get_last_ctn_for_revoked_secret(funding_address)
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if latest_ctn_on_channel != ctn:
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raise Exception('unexpected ctn {}. latest is {}'.format(ctn, latest_ctn_on_channel))
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if last_ctn_watcher_saw + 1 != ctn:
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raise Exception('watcher skipping ctns!! ctn {}. last seen {}'.format(ctn, last_ctn_watcher_saw))
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sweep_address = self._get_sweep_address_for_chan(chan)
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encumbered_sweeptx = maybe_create_sweeptx_for_their_ctx_to_local(chan, ctx, per_commitment_secret, sweep_address)
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self.add_to_sweepstore(chan.funding_outpoint.to_str(), ctx.txid(), encumbered_sweeptx)
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self._inc_last_ctn_for_revoked_secret(funding_address)
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self.write_to_disk()
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def add_to_sweepstore(self, funding_outpoint: str, ctx_txid: str, encumbered_sweeptx: EncumberedTransaction):
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if encumbered_sweeptx is None:
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return
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with self.lock:
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self.sweepstore[funding_outpoint][ctx_txid].add(encumbered_sweeptx)
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def get_tx_mined_status(self, txid: str):
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if not txid:
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return TX_MINED_STATUS_FREE
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tx_mined_status = self.addr_sync.get_tx_height(txid)
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height, conf = tx_mined_status.height, tx_mined_status.conf
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if conf > 100:
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return TX_MINED_STATUS_DEEP
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elif conf > 0:
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return TX_MINED_STATUS_SHALLOW
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elif height in (wallet.TX_HEIGHT_UNCONFIRMED, wallet.TX_HEIGHT_UNCONF_PARENT):
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return TX_MINED_STATUS_MEMPOOL
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elif height == wallet.TX_HEIGHT_LOCAL:
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return TX_MINED_STATUS_FREE
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elif height > 0 and conf == 0:
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# unverified but claimed to be mined
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return TX_MINED_STATUS_MEMPOOL
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else:
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raise NotImplementedError()
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def get_deepest_tx_mined_status_for_txids(self, set_of_txids: Iterable[str]):
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if not set_of_txids:
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return TX_MINED_STATUS_FREE
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# note: using "min" as lower status values are deeper
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return min(map(self.get_tx_mined_status, set_of_txids))
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def print_tx_broadcast_result(self, res):
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success, msg = res
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self.print_error('broadcast: {}, {}'.format('success' if success else 'failure', msg))
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def maybe_create_sweeptx_for_their_ctx_to_remote(chan, ctx, their_pcp: bytes,
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sweep_address) -> Optional[EncumberedTransaction]:
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assert isinstance(their_pcp, bytes)
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payment_bp_privkey = ecc.ECPrivkey(chan.local_config.payment_basepoint.privkey)
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our_payment_privkey = derive_privkey(payment_bp_privkey.secret_scalar, their_pcp)
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our_payment_privkey = ecc.ECPrivkey.from_secret_scalar(our_payment_privkey)
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our_payment_pubkey = our_payment_privkey.get_public_key_bytes(compressed=True)
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to_remote_address = make_commitment_output_to_remote_address(our_payment_pubkey)
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for output_idx, (type_, addr, val) in enumerate(ctx.outputs()):
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if type_ == TYPE_ADDRESS and addr == to_remote_address:
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break
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else:
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return None
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sweep_tx = create_sweeptx_their_ctx_to_remote(address=sweep_address,
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ctx=ctx,
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output_idx=output_idx,
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our_payment_privkey=our_payment_privkey)
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return EncumberedTransaction(sweep_tx, csv_delay=0)
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def maybe_create_sweeptx_for_their_ctx_to_local(chan, ctx, per_commitment_secret: bytes,
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sweep_address) -> Optional[EncumberedTransaction]:
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assert isinstance(per_commitment_secret, bytes)
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per_commitment_point = ecc.ECPrivkey(per_commitment_secret).get_public_key_bytes(compressed=True)
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revocation_privkey = lnutil.derive_blinded_privkey(chan.local_config.revocation_basepoint.privkey,
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per_commitment_secret)
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revocation_pubkey = ecc.ECPrivkey(revocation_privkey).get_public_key_bytes(compressed=True)
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to_self_delay = chan.local_config.to_self_delay
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delayed_pubkey = derive_pubkey(chan.remote_config.delayed_basepoint.pubkey,
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per_commitment_point)
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witness_script = bh2u(lnutil.make_commitment_output_to_local_witness_script(
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revocation_pubkey, to_self_delay, delayed_pubkey))
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to_local_address = redeem_script_to_address('p2wsh', witness_script)
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for output_idx, o in enumerate(ctx.outputs()):
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if o.type == TYPE_ADDRESS and o.address == to_local_address:
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break
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else:
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return None
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sweep_tx = create_sweeptx_ctx_to_local(address=sweep_address,
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ctx=ctx,
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output_idx=output_idx,
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witness_script=witness_script,
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privkey=revocation_privkey,
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is_revocation=True)
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return EncumberedTransaction(sweep_tx, csv_delay=0)
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def maybe_create_sweeptx_for_our_ctx_to_local(chan, ctx, our_pcp: bytes,
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sweep_address) -> Optional[EncumberedTransaction]:
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assert isinstance(our_pcp, bytes)
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delayed_bp_privkey = ecc.ECPrivkey(chan.local_config.delayed_basepoint.privkey)
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our_localdelayed_privkey = derive_privkey(delayed_bp_privkey.secret_scalar, our_pcp)
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our_localdelayed_privkey = ecc.ECPrivkey.from_secret_scalar(our_localdelayed_privkey)
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our_localdelayed_pubkey = our_localdelayed_privkey.get_public_key_bytes(compressed=True)
|
|
revocation_pubkey = lnutil.derive_blinded_pubkey(chan.remote_config.revocation_basepoint.pubkey,
|
|
our_pcp)
|
|
to_self_delay = chan.remote_config.to_self_delay
|
|
witness_script = bh2u(lnutil.make_commitment_output_to_local_witness_script(
|
|
revocation_pubkey, to_self_delay, our_localdelayed_pubkey))
|
|
to_local_address = redeem_script_to_address('p2wsh', witness_script)
|
|
for output_idx, o in enumerate(ctx.outputs()):
|
|
if o.type == TYPE_ADDRESS and o.address == to_local_address:
|
|
break
|
|
else:
|
|
return None
|
|
sweep_tx = create_sweeptx_ctx_to_local(address=sweep_address,
|
|
ctx=ctx,
|
|
output_idx=output_idx,
|
|
witness_script=witness_script,
|
|
privkey=our_localdelayed_privkey.get_secret_bytes(),
|
|
is_revocation=False,
|
|
to_self_delay=to_self_delay)
|
|
|
|
return EncumberedTransaction(sweep_tx, csv_delay=to_self_delay)
|
|
|
|
|
|
def create_sweeptx_their_ctx_to_remote(address, ctx, output_idx: int, our_payment_privkey: ecc.ECPrivkey,
|
|
fee_per_kb: int=None) -> Transaction:
|
|
our_payment_pubkey = our_payment_privkey.get_public_key_hex(compressed=True)
|
|
val = ctx.outputs()[output_idx].value
|
|
sweep_inputs = [{
|
|
'type': 'p2wpkh',
|
|
'x_pubkeys': [our_payment_pubkey],
|
|
'num_sig': 1,
|
|
'prevout_n': output_idx,
|
|
'prevout_hash': ctx.txid(),
|
|
'value': val,
|
|
'coinbase': False,
|
|
'signatures': [None],
|
|
}]
|
|
tx_size_bytes = 110 # approx size of p2wpkh->p2wpkh
|
|
if fee_per_kb is None: fee_per_kb = FEERATE_FALLBACK_STATIC_FEE
|
|
fee = SimpleConfig.estimate_fee_for_feerate(fee_per_kb, tx_size_bytes)
|
|
sweep_outputs = [TxOutput(TYPE_ADDRESS, address, val-fee)]
|
|
sweep_tx = Transaction.from_io(sweep_inputs, sweep_outputs)
|
|
sweep_tx.set_rbf(True)
|
|
sweep_tx.sign({our_payment_pubkey: (our_payment_privkey.get_secret_bytes(), True)})
|
|
if not sweep_tx.is_complete():
|
|
raise Exception('channel close sweep tx is not complete')
|
|
return sweep_tx
|
|
|
|
|
|
def create_sweeptx_ctx_to_local(address, ctx, output_idx: int, witness_script: str,
|
|
privkey: bytes, is_revocation: bool,
|
|
to_self_delay: int=None,
|
|
fee_per_kb: int=None) -> Transaction:
|
|
"""Create a txn that sweeps the 'to_local' output of a commitment
|
|
transaction into our wallet.
|
|
|
|
privkey: either revocation_privkey or localdelayed_privkey
|
|
is_revocation: tells us which ^
|
|
"""
|
|
val = ctx.outputs()[output_idx].value
|
|
sweep_inputs = [{
|
|
'scriptSig': '',
|
|
'type': 'p2wsh',
|
|
'signatures': [],
|
|
'num_sig': 0,
|
|
'prevout_n': output_idx,
|
|
'prevout_hash': ctx.txid(),
|
|
'value': val,
|
|
'coinbase': False,
|
|
'preimage_script': witness_script,
|
|
}]
|
|
if to_self_delay is not None:
|
|
sweep_inputs[0]['sequence'] = to_self_delay
|
|
tx_size_bytes = 121 # approx size of to_local -> p2wpkh
|
|
if fee_per_kb is None: fee_per_kb = FEERATE_FALLBACK_STATIC_FEE
|
|
fee = SimpleConfig.estimate_fee_for_feerate(fee_per_kb, tx_size_bytes)
|
|
sweep_outputs = [TxOutput(TYPE_ADDRESS, address, val - fee)]
|
|
sweep_tx = Transaction.from_io(sweep_inputs, sweep_outputs, version=2)
|
|
sig = sweep_tx.sign_txin(0, privkey)
|
|
witness = transaction.construct_witness([sig, int(is_revocation), witness_script])
|
|
sweep_tx.inputs()[0]['witness'] = witness
|
|
return sweep_tx
|
|
|