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electrum/electrum/lnworker.py

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# Copyright (C) 2018 The Electrum developers
# Distributed under the MIT software license, see the accompanying
# file LICENCE or http://www.opensource.org/licenses/mit-license.php
import asyncio
import os
from decimal import Decimal
import random
import time
from typing import Optional, Sequence, Tuple, List, Dict, TYPE_CHECKING, NamedTuple, Union, Mapping
import threading
import socket
import json
from datetime import datetime, timezone
from functools import partial
from collections import defaultdict
import concurrent
from concurrent import futures
import dns.resolver
import dns.exception
from aiorpcx import run_in_thread
from . import constants, util
from . import keystore
from .util import profiler
from .invoices import PR_TYPE_LN, PR_UNPAID, PR_EXPIRED, PR_PAID, PR_INFLIGHT, PR_FAILED, PR_ROUTING, LNInvoice
from .util import NetworkRetryManager
from .lnutil import LN_MAX_FUNDING_SAT
from .keystore import BIP32_KeyStore
from .bitcoin import COIN
from .transaction import Transaction
from .crypto import sha256
from .bip32 import BIP32Node
from .util import bh2u, bfh, InvoiceError, resolve_dns_srv, is_ip_address, log_exceptions
from .util import ignore_exceptions, make_aiohttp_session, SilentTaskGroup
from .util import timestamp_to_datetime
from .util import MyEncoder
from .logging import Logger
from .lntransport import LNTransport, LNResponderTransport
from .lnpeer import Peer, LN_P2P_NETWORK_TIMEOUT
from .lnaddr import lnencode, LnAddr, lndecode
from .ecc import der_sig_from_sig_string
from .lnchannel import Channel
from .lnchannel import ChannelState, PeerState
from . import lnutil
from .lnutil import funding_output_script
from .bitcoin import redeem_script_to_address
from .lnutil import (Outpoint, LNPeerAddr,
get_compressed_pubkey_from_bech32, extract_nodeid,
PaymentFailure, split_host_port, ConnStringFormatError,
generate_keypair, LnKeyFamily, LOCAL, REMOTE,
MIN_FINAL_CLTV_EXPIRY_FOR_INVOICE,
NUM_MAX_EDGES_IN_PAYMENT_PATH, SENT, RECEIVED, HTLCOwner,
UpdateAddHtlc, Direction, LnFeatures,
ShortChannelID, PaymentAttemptLog, PaymentAttemptFailureDetails,
BarePaymentAttemptLog, derive_payment_secret_from_payment_preimage)
from .lnutil import ln_dummy_address, ln_compare_features, IncompatibleLightningFeatures
from .transaction import PartialTxOutput, PartialTransaction, PartialTxInput
from .lnonion import OnionFailureCode, process_onion_packet, OnionPacket
from .lnmsg import decode_msg
from .i18n import _
from .lnrouter import (RouteEdge, LNPaymentRoute, LNPaymentPath, is_route_sane_to_use,
NoChannelPolicy, LNPathInconsistent)
from .address_synchronizer import TX_HEIGHT_LOCAL
from . import lnsweep
from .lnwatcher import LNWalletWatcher
from .crypto import pw_encode_bytes, pw_decode_bytes, PW_HASH_VERSION_LATEST
from .lnutil import ChannelBackupStorage
from .lnchannel import ChannelBackup
from .channel_db import UpdateStatus
if TYPE_CHECKING:
from .network import Network
from .wallet import Abstract_Wallet
SAVED_PR_STATUS = [PR_PAID, PR_UNPAID, PR_INFLIGHT] # status that are persisted
NUM_PEERS_TARGET = 4
FALLBACK_NODE_LIST_TESTNET = (
LNPeerAddr(host='203.132.95.10', port=9735, pubkey=bfh('038863cf8ab91046230f561cd5b386cbff8309fa02e3f0c3ed161a3aeb64a643b9')),
LNPeerAddr(host='2401:d002:4402:0:bf1d:986a:7598:6d49', port=9735, pubkey=bfh('038863cf8ab91046230f561cd5b386cbff8309fa02e3f0c3ed161a3aeb64a643b9')),
LNPeerAddr(host='50.116.3.223', port=9734, pubkey=bfh('03236a685d30096b26692dce0cf0fa7c8528bdf61dbf5363a3ef6d5c92733a3016')),
LNPeerAddr(host='3.16.119.191', port=9735, pubkey=bfh('03d5e17a3c213fe490e1b0c389f8cfcfcea08a29717d50a9f453735e0ab2a7c003')),
LNPeerAddr(host='34.250.234.192', port=9735, pubkey=bfh('03933884aaf1d6b108397e5efe5c86bcf2d8ca8d2f700eda99db9214fc2712b134')),
LNPeerAddr(host='88.99.209.230', port=9735, pubkey=bfh('0260d9119979caedc570ada883ff614c6efb93f7f7382e25d73ecbeba0b62df2d7')),
LNPeerAddr(host='160.16.233.215', port=9735, pubkey=bfh('023ea0a53af875580899da0ab0a21455d9c19160c4ea1b7774c9d4be6810b02d2c')),
LNPeerAddr(host='197.155.6.173', port=9735, pubkey=bfh('0269a94e8b32c005e4336bfb743c08a6e9beb13d940d57c479d95c8e687ccbdb9f')),
LNPeerAddr(host='2c0f:fb18:406::4', port=9735, pubkey=bfh('0269a94e8b32c005e4336bfb743c08a6e9beb13d940d57c479d95c8e687ccbdb9f')),
LNPeerAddr(host='163.172.94.64', port=9735, pubkey=bfh('030f0bf260acdbd3edcad84d7588ec7c5df4711e87e6a23016f989b8d3a4147230')),
LNPeerAddr(host='23.237.77.12', port=9735, pubkey=bfh('02312627fdf07fbdd7e5ddb136611bdde9b00d26821d14d94891395452f67af248')),
LNPeerAddr(host='197.155.6.172', port=9735, pubkey=bfh('02ae2f22b02375e3e9b4b4a2db4f12e1b50752b4062dbefd6e01332acdaf680379')),
LNPeerAddr(host='2c0f:fb18:406::3', port=9735, pubkey=bfh('02ae2f22b02375e3e9b4b4a2db4f12e1b50752b4062dbefd6e01332acdaf680379')),
LNPeerAddr(host='23.239.23.44', port=9740, pubkey=bfh('034fe52e98a0e9d3c21b767e1b371881265d8c7578c21f5afd6d6438da10348b36')),
LNPeerAddr(host='2600:3c01::f03c:91ff:fe05:349c', port=9740, pubkey=bfh('034fe52e98a0e9d3c21b767e1b371881265d8c7578c21f5afd6d6438da10348b36')),
)
FALLBACK_NODE_LIST_MAINNET = [
LNPeerAddr(host='172.81.181.3', port=9735, pubkey=bfh('0214382bdce7750dfcb8126df8e2b12de38536902dc36abcebdaeefdeca1df8284')),
LNPeerAddr(host='35.230.100.60', port=9735, pubkey=bfh('023f5e3582716bed96f6f26cfcd8037e07474d7b4743afdc8b07e692df63464d7e')),
LNPeerAddr(host='40.69.71.114', port=9735, pubkey=bfh('028303182c9885da93b3b25c9621d22cf34475e63c123942e402ab530c0556e675')),
LNPeerAddr(host='94.177.171.73', port=9735, pubkey=bfh('0276e09a267592e7451a939c932cf685f0754de382a3ca85d2fb3a864d4c365ad5')),
LNPeerAddr(host='34.236.113.58', port=9735, pubkey=bfh('02fa50c72ee1e2eb5f1b6d9c3032080c4c864373c4201dfa2966aa34eee1051f97')),
LNPeerAddr(host='52.50.244.44', port=9735, pubkey=bfh('030c3f19d742ca294a55c00376b3b355c3c90d61c6b6b39554dbc7ac19b141c14f')),
LNPeerAddr(host='157.245.68.47', port=9735, pubkey=bfh('03c2abfa93eacec04721c019644584424aab2ba4dff3ac9bdab4e9c97007491dda')),
LNPeerAddr(host='18.221.23.28', port=9735, pubkey=bfh('03abf6f44c355dec0d5aa155bdbdd6e0c8fefe318eff402de65c6eb2e1be55dc3e')),
LNPeerAddr(host='52.224.178.244', port=9735, pubkey=bfh('026b105ac13212c48714c6be9b11577a9ce10f10e1c88a45ce217e6331209faf8b')),
LNPeerAddr(host='34.239.230.56', port=9735, pubkey=bfh('03864ef025fde8fb587d989186ce6a4a186895ee44a926bfc370e2c366597a3f8f')),
LNPeerAddr(host='46.229.165.136', port=9735, pubkey=bfh('0390b5d4492dc2f5318e5233ab2cebf6d48914881a33ef6a9c6bcdbb433ad986d0')),
LNPeerAddr(host='157.230.28.160', port=9735, pubkey=bfh('0279c22ed7a068d10dc1a38ae66d2d6461e269226c60258c021b1ddcdfe4b00bc4')),
LNPeerAddr(host='74.108.13.152', port=9735, pubkey=bfh('0331f80652fb840239df8dc99205792bba2e559a05469915804c08420230e23c7c')),
LNPeerAddr(host='167.172.44.148', port=9735, pubkey=bfh('0395033b252c6f40e3756984162d68174e2bd8060a129c0d3462a9370471c6d28f')),
LNPeerAddr(host='138.68.14.104', port=9735, pubkey=bfh('03bb88ccc444534da7b5b64b4f7b15e1eccb18e102db0e400d4b9cfe93763aa26d')),
LNPeerAddr(host='3.124.63.44', port=9735, pubkey=bfh('0242a4ae0c5bef18048fbecf995094b74bfb0f7391418d71ed394784373f41e4f3')),
LNPeerAddr(host='2001:470:8:2e1::43', port=9735, pubkey=bfh('03baa70886d9200af0ffbd3f9e18d96008331c858456b16e3a9b41e735c6208fef')),
LNPeerAddr(host='2601:186:c100:6bcd:219:d1ff:fe75:dc2f', port=9735, pubkey=bfh('0298f6074a454a1f5345cb2a7c6f9fce206cd0bf675d177cdbf0ca7508dd28852f')),
LNPeerAddr(host='2001:41d0:e:734::1', port=9735, pubkey=bfh('03a503d8e30f2ff407096d235b5db63b4fcf3f89a653acb6f43d3fc492a7674019')),
LNPeerAddr(host='2a01:4f9:2b:2254::2', port=9735, pubkey=bfh('02f3069a342ae2883a6f29e275f06f28a56a6ea2e2d96f5888a3266444dcf542b6')),
LNPeerAddr(host='2a02:8070:24c1:100:528c:2997:6dbc:a054', port=9735, pubkey=bfh('02a45def9ae014fdd2603dd7033d157faa3a55a72b06a63ae22ef46d9fafdc6e8d')),
LNPeerAddr(host='2600:3c01::f03c:91ff:fe05:349c', port=9736, pubkey=bfh('02731b798b39a09f9f14e90ee601afb6ebb796d6e5797de14582a978770b33700f')),
LNPeerAddr(host='2a00:8a60:e012:a00::21', port=9735, pubkey=bfh('027ce055380348d7812d2ae7745701c9f93e70c1adeb2657f053f91df4f2843c71')),
LNPeerAddr(host='2604:a880:400:d1::8bd:1001', port=9735, pubkey=bfh('03649c72a4816f0cd546f84aafbd657e92a30ab474de7ab795e8b5650a427611f7')),
LNPeerAddr(host='2a01:4f8:c0c:7b31::1', port=9735, pubkey=bfh('02c16cca44562b590dd279c942200bdccfd4f990c3a69fad620c10ef2f8228eaff')),
LNPeerAddr(host='2001:41d0:1:b40d::1', port=9735, pubkey=bfh('026726a4b043d413b45b334876d17b8a98848129604429ec65532ba286a42efeac')),
]
class PaymentInfo(NamedTuple):
payment_hash: bytes
amount: int # in satoshis
direction: int
status: int
class NoPathFound(PaymentFailure):
def __str__(self):
return _('No path found')
class LNWorker(Logger, NetworkRetryManager[LNPeerAddr]):
def __init__(self, xprv):
Logger.__init__(self)
NetworkRetryManager.__init__(
self,
max_retry_delay_normal=3600,
init_retry_delay_normal=600,
max_retry_delay_urgent=300,
init_retry_delay_urgent=4,
)
self.lock = threading.RLock()
self.node_keypair = generate_keypair(BIP32Node.from_xkey(xprv), LnKeyFamily.NODE_KEY)
self._peers = {} # type: Dict[bytes, Peer] # pubkey -> Peer # needs self.lock
self.taskgroup = SilentTaskGroup()
# set some feature flags as baseline for both LNWallet and LNGossip
# note that e.g. DATA_LOSS_PROTECT is needed for LNGossip as many peers require it
self.features = LnFeatures(0)
self.features |= LnFeatures.OPTION_DATA_LOSS_PROTECT_OPT
self.features |= LnFeatures.OPTION_STATIC_REMOTEKEY_OPT
self.features |= LnFeatures.VAR_ONION_OPT
self.features |= LnFeatures.PAYMENT_SECRET_OPT
util.register_callback(self.on_proxy_changed, ['proxy_set'])
@property
def peers(self) -> Mapping[bytes, Peer]:
"""Returns a read-only copy of peers."""
with self.lock:
return self._peers.copy()
def channels_for_peer(self, node_id):
return {}
async def maybe_listen(self):
# FIXME: only one LNWorker can listen at a time (single port)
listen_addr = self.config.get('lightning_listen')
if listen_addr:
addr, port = listen_addr.rsplit(':', 2)
if addr[0] == '[':
# ipv6
addr = addr[1:-1]
async def cb(reader, writer):
transport = LNResponderTransport(self.node_keypair.privkey, reader, writer)
try:
node_id = await transport.handshake()
except:
self.logger.info('handshake failure from incoming connection')
return
peer = Peer(self, node_id, transport)
with self.lock:
self._peers[node_id] = peer
await self.taskgroup.spawn(peer.main_loop())
try:
# FIXME: server.close(), server.wait_closed(), etc... ?
# TODO: onion hidden service?
server = await asyncio.start_server(cb, addr, int(port))
except OSError as e:
self.logger.error(f"cannot listen for lightning p2p. error: {e!r}")
@ignore_exceptions # don't kill outer taskgroup
async def main_loop(self):
self.logger.info("starting taskgroup.")
try:
async with self.taskgroup as group:
await group.spawn(self._maintain_connectivity())
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.exception("taskgroup died.")
finally:
self.logger.info("taskgroup stopped.")
async def _maintain_connectivity(self):
while True:
await asyncio.sleep(1)
now = time.time()
if len(self._peers) >= NUM_PEERS_TARGET:
continue
peers = await self._get_next_peers_to_try()
for peer in peers:
if self._can_retry_addr(peer, now=now):
await self._add_peer(peer.host, peer.port, peer.pubkey)
async def _add_peer(self, host: str, port: int, node_id: bytes) -> Peer:
if node_id in self._peers:
return self._peers[node_id]
port = int(port)
peer_addr = LNPeerAddr(host, port, node_id)
transport = LNTransport(self.node_keypair.privkey, peer_addr,
proxy=self.network.proxy)
self._trying_addr_now(peer_addr)
self.logger.info(f"adding peer {peer_addr}")
peer = Peer(self, node_id, transport)
await self.taskgroup.spawn(peer.main_loop())
with self.lock:
self._peers[node_id] = peer
return peer
def peer_closed(self, peer: Peer) -> None:
with self.lock:
self._peers.pop(peer.pubkey, None)
def num_peers(self) -> int:
return sum([p.is_initialized() for p in self.peers.values()])
def start_network(self, network: 'Network'):
assert network
self.network = network
self.config = network.config
self.channel_db = self.network.channel_db
self._add_peers_from_config()
asyncio.run_coroutine_threadsafe(self.main_loop(), self.network.asyncio_loop)
def stop(self):
asyncio.run_coroutine_threadsafe(self.taskgroup.cancel_remaining(), self.network.asyncio_loop)
util.unregister_callback(self.on_proxy_changed)
def _add_peers_from_config(self):
peer_list = self.config.get('lightning_peers', [])
for host, port, pubkey in peer_list:
asyncio.run_coroutine_threadsafe(
self._add_peer(host, int(port), bfh(pubkey)),
self.network.asyncio_loop)
def is_good_peer(self, peer):
# the purpose of this method is to filter peers that advertise the desired feature bits
# it is disabled for now, because feature bits published in node announcements seem to be unreliable
return True
node_id = peer.pubkey
node = self.channel_db._nodes.get(node_id)
if not node:
return False
try:
ln_compare_features(self.features, node.features)
except IncompatibleLightningFeatures:
return False
#self.logger.info(f'is_good {peer.host}')
return True
def on_peer_successfully_established(self, peer: Peer) -> None:
if isinstance(peer.transport, LNTransport):
peer_addr = peer.transport.peer_addr
# reset connection attempt count
self._on_connection_successfully_established(peer_addr)
# add into channel db
if self.channel_db:
self.channel_db.add_recent_peer(peer_addr)
# save network address into channels we might have with peer
for chan in peer.channels.values():
chan.add_or_update_peer_addr(peer_addr)
async def _get_next_peers_to_try(self) -> Sequence[LNPeerAddr]:
now = time.time()
await self.channel_db.data_loaded.wait()
# first try from recent peers
recent_peers = self.channel_db.get_recent_peers()
for peer in recent_peers:
if not peer:
continue
if peer.pubkey in self._peers:
continue
if not self._can_retry_addr(peer, now=now):
continue
if not self.is_good_peer(peer):
continue
return [peer]
# try random peer from graph
unconnected_nodes = self.channel_db.get_200_randomly_sorted_nodes_not_in(self.peers.keys())
if unconnected_nodes:
for node_id in unconnected_nodes:
addrs = self.channel_db.get_node_addresses(node_id)
if not addrs:
continue
host, port, timestamp = self.choose_preferred_address(list(addrs))
try:
peer = LNPeerAddr(host, port, node_id)
except ValueError:
continue
if not self._can_retry_addr(peer, now=now):
continue
if not self.is_good_peer(peer):
continue
#self.logger.info('taking random ln peer from our channel db')
return [peer]
# getting desperate... let's try hardcoded fallback list of peers
if constants.net in (constants.BitcoinTestnet, ):
fallback_list = FALLBACK_NODE_LIST_TESTNET
elif constants.net in (constants.BitcoinMainnet, ):
fallback_list = FALLBACK_NODE_LIST_MAINNET
else:
return [] # regtest??
fallback_list = [peer for peer in fallback_list if self._can_retry_addr(peer, now=now)]
if fallback_list:
return [random.choice(fallback_list)]
# last resort: try dns seeds (BOLT-10)
return await run_in_thread(self._get_peers_from_dns_seeds)
def _get_peers_from_dns_seeds(self) -> Sequence[LNPeerAddr]:
# NOTE: potentially long blocking call, do not run directly on asyncio event loop.
# Return several peers to reduce the number of dns queries.
if not constants.net.LN_DNS_SEEDS:
return []
dns_seed = random.choice(constants.net.LN_DNS_SEEDS)
self.logger.info('asking dns seed "{}" for ln peers'.format(dns_seed))
try:
# note: this might block for several seconds
# this will include bech32-encoded-pubkeys and ports
srv_answers = resolve_dns_srv('r{}.{}'.format(
constants.net.LN_REALM_BYTE, dns_seed))
except dns.exception.DNSException as e:
self.logger.info(f'failed querying (1) dns seed "{dns_seed}" for ln peers: {repr(e)}')
return []
random.shuffle(srv_answers)
num_peers = 2 * NUM_PEERS_TARGET
srv_answers = srv_answers[:num_peers]
# we now have pubkeys and ports but host is still needed
peers = []
for srv_ans in srv_answers:
try:
# note: this might block for several seconds
answers = dns.resolver.query(srv_ans['host'])
except dns.exception.DNSException as e:
self.logger.info(f'failed querying (2) dns seed "{dns_seed}" for ln peers: {repr(e)}')
continue
try:
ln_host = str(answers[0])
port = int(srv_ans['port'])
bech32_pubkey = srv_ans['host'].split('.')[0]
pubkey = get_compressed_pubkey_from_bech32(bech32_pubkey)
peers.append(LNPeerAddr(ln_host, port, pubkey))
except Exception as e:
self.logger.info(f'error with parsing peer from dns seed: {repr(e)}')
continue
self.logger.info(f'got {len(peers)} ln peers from dns seed')
return peers
@staticmethod
def choose_preferred_address(addr_list: Sequence[Tuple[str, int, int]]) -> Tuple[str, int, int]:
assert len(addr_list) >= 1
# choose first one that is an IP
for host, port, timestamp in addr_list:
if is_ip_address(host):
return host, port, timestamp
# otherwise choose one at random
# TODO maybe filter out onion if not on tor?
choice = random.choice(addr_list)
return choice
def on_proxy_changed(self, event, *args):
for peer in self.peers.values():
peer.close_and_cleanup()
self._clear_addr_retry_times()
@log_exceptions
async def add_peer(self, connect_str: str) -> Peer:
node_id, rest = extract_nodeid(connect_str)
peer = self._peers.get(node_id)
if not peer:
if rest is not None:
host, port = split_host_port(rest)
else:
addrs = self.channel_db.get_node_addresses(node_id)
if not addrs:
raise ConnStringFormatError(_('Don\'t know any addresses for node:') + ' ' + bh2u(node_id))
host, port, timestamp = self.choose_preferred_address(addrs)
port = int(port)
# Try DNS-resolving the host (if needed). This is simply so that
# the caller gets a nice exception if it cannot be resolved.
try:
await asyncio.get_event_loop().getaddrinfo(host, port)
except socket.gaierror:
raise ConnStringFormatError(_('Hostname does not resolve (getaddrinfo failed)'))
# add peer
peer = await self._add_peer(host, port, node_id)
return peer
class LNGossip(LNWorker):
max_age = 14*24*3600
LOGGING_SHORTCUT = 'g'
def __init__(self):
seed = os.urandom(32)
node = BIP32Node.from_rootseed(seed, xtype='standard')
xprv = node.to_xprv()
super().__init__(xprv)
self.features |= LnFeatures.GOSSIP_QUERIES_OPT
self.features |= LnFeatures.GOSSIP_QUERIES_REQ
self.unknown_ids = set()
def start_network(self, network: 'Network'):
assert network
super().start_network(network)
asyncio.run_coroutine_threadsafe(self.taskgroup.spawn(self.maintain_db()), self.network.asyncio_loop)
async def maintain_db(self):
await self.channel_db.load_data()
while True:
if len(self.unknown_ids) == 0:
self.channel_db.prune_old_policies(self.max_age)
self.channel_db.prune_orphaned_channels()
await asyncio.sleep(120)
async def add_new_ids(self, ids):
known = self.channel_db.get_channel_ids()
new = set(ids) - set(known)
self.unknown_ids.update(new)
util.trigger_callback('unknown_channels', len(self.unknown_ids))
util.trigger_callback('gossip_peers', self.num_peers())
util.trigger_callback('ln_gossip_sync_progress')
def get_ids_to_query(self):
N = 500
l = list(self.unknown_ids)
self.unknown_ids = set(l[N:])
util.trigger_callback('unknown_channels', len(self.unknown_ids))
util.trigger_callback('ln_gossip_sync_progress')
return l[0:N]
def get_sync_progress_estimate(self) -> Tuple[Optional[int], Optional[int]]:
if self.num_peers() == 0:
return None, None
nchans_with_0p, nchans_with_1p, nchans_with_2p = self.channel_db.get_num_channels_partitioned_by_policy_count()
num_db_channels = nchans_with_0p + nchans_with_1p + nchans_with_2p
# some channels will never have two policies (only one is in gossip?...)
# so if we have at least 1 policy for a channel, we consider that channel "complete" here
current_est = num_db_channels - nchans_with_0p
total_est = len(self.unknown_ids) + num_db_channels
return current_est, total_est
class LNWallet(LNWorker):
def __init__(self, wallet: 'Abstract_Wallet', xprv):
Logger.__init__(self)
self.wallet = wallet
self.db = wallet.db
self.config = wallet.config
LNWorker.__init__(self, xprv)
self.features |= LnFeatures.OPTION_DATA_LOSS_PROTECT_REQ
self.features |= LnFeatures.OPTION_STATIC_REMOTEKEY_REQ
self.payments = self.db.get_dict('lightning_payments') # RHASH -> amount, direction, is_paid
self.preimages = self.db.get_dict('lightning_preimages') # RHASH -> preimage
self.sweep_address = wallet.get_new_sweep_address_for_channel() # TODO possible address-reuse
self.logs = defaultdict(list) # type: Dict[str, List[PaymentAttemptLog]] # key is RHASH # (not persisted)
self.is_routing = set() # (not persisted) keys of invoices that are in PR_ROUTING state
# used in tests
self.enable_htlc_settle = asyncio.Event()
self.enable_htlc_settle.set()
# note: accessing channels (besides simple lookup) needs self.lock!
self._channels = {} # type: Dict[bytes, Channel]
channels = self.db.get_dict("channels")
for channel_id, c in channels.items():
self._channels[bfh(channel_id)] = Channel(c, sweep_address=self.sweep_address, lnworker=self)
self.pending_payments = defaultdict(asyncio.Future) # type: Dict[bytes, asyncio.Future[BarePaymentAttemptLog]]
@property
def channels(self) -> Mapping[bytes, Channel]:
"""Returns a read-only copy of channels."""
with self.lock:
return self._channels.copy()
def get_channel_by_id(self, channel_id: bytes) -> Optional[Channel]:
return self._channels.get(channel_id, None)
@ignore_exceptions
@log_exceptions
async def sync_with_local_watchtower(self):
watchtower = self.network.local_watchtower
if watchtower:
while True:
for chan in self.channels.values():
await self.sync_channel_with_watchtower(chan, watchtower.sweepstore)
await asyncio.sleep(5)
@ignore_exceptions
@log_exceptions
async def sync_with_remote_watchtower(self):
import aiohttp
from jsonrpcclient.clients.aiohttp_client import AiohttpClient
class myAiohttpClient(AiohttpClient):
async def request(self, *args, **kwargs):
r = await super().request(*args, **kwargs)
return r.data.result
while True:
await asyncio.sleep(5)
watchtower_url = self.config.get('watchtower_url')
if not watchtower_url:
continue
try:
async with make_aiohttp_session(proxy=self.network.proxy) as session:
watchtower = myAiohttpClient(session, watchtower_url)
for chan in self.channels.values():
await self.sync_channel_with_watchtower(chan, watchtower)
except aiohttp.client_exceptions.ClientConnectorError:
self.logger.info(f'could not contact remote watchtower {watchtower_url}')
async def sync_channel_with_watchtower(self, chan: Channel, watchtower):
outpoint = chan.funding_outpoint.to_str()
addr = chan.get_funding_address()
current_ctn = chan.get_oldest_unrevoked_ctn(REMOTE)
watchtower_ctn = await watchtower.get_ctn(outpoint, addr)
for ctn in range(watchtower_ctn + 1, current_ctn):
sweeptxs = chan.create_sweeptxs(ctn)
for tx in sweeptxs:
await watchtower.add_sweep_tx(outpoint, ctn, tx.inputs()[0].prevout.to_str(), tx.serialize())
def start_network(self, network: 'Network'):
assert network
self.lnwatcher = LNWalletWatcher(self, network)
self.lnwatcher.start_network(network)
self.network = network
for chan in self.channels.values():
self.lnwatcher.add_channel(chan.funding_outpoint.to_str(), chan.get_funding_address())
super().start_network(network)
for coro in [
self.maybe_listen(),
self.lnwatcher.on_network_update('network_updated'), # shortcut (don't block) if funding tx locked and verified
self.reestablish_peers_and_channels(),
self.sync_with_local_watchtower(),
self.sync_with_remote_watchtower(),
]:
tg_coro = self.taskgroup.spawn(coro)
asyncio.run_coroutine_threadsafe(tg_coro, self.network.asyncio_loop)
def stop(self):
super().stop()
self.lnwatcher.stop()
self.lnwatcher = None
def peer_closed(self, peer):
for chan in self.channels_for_peer(peer.pubkey).values():
chan.peer_state = PeerState.DISCONNECTED
util.trigger_callback('channel', chan)
super().peer_closed(peer)
def get_settled_payments(self):
# return one item per payment_hash
# note: with AMP we will have several channels per payment
out = defaultdict(list)
for chan in self.channels.values():
d = chan.get_settled_payments()
for k, v in d.items():
out[k] += v
return out
def get_lightning_history(self):
out = {}
for key, plist in self.get_settled_payments().items():
if len(plist) == 0:
continue
payment_hash = bytes.fromhex(key)
info = self.get_payment_info(payment_hash)
timestamp = min([htlc.timestamp for chan_id, htlc, _direction in plist])
amount_msat = 0
fee_msat = None
for chan_id, htlc, _direction in plist:
amount_msat += int(_direction) * htlc.amount_msat
if _direction == SENT and info and info.amount:
fee_msat = (fee_msat or 0) - info.amount*1000 - amount_msat
if info is not None:
label = self.wallet.get_label(key)
direction = ('sent' if info.direction == SENT else 'received') if len(plist)==1 else 'self-payment'
else:
direction = 'forwarding'
label = _('Forwarding')
preimage = self.get_preimage(payment_hash).hex()
item = {
'type': 'payment',
'label': label,
'timestamp': timestamp or 0,
'date': timestamp_to_datetime(timestamp),
'direction': direction,
'amount_msat': amount_msat,
'fee_msat': fee_msat,
'payment_hash': key,
'preimage': preimage,
}
out[payment_hash] = item
return out
def get_onchain_history(self):
out = {}
# add funding events
for chan in self.channels.values():
item = chan.get_funding_height()
if item is None:
continue
funding_txid, funding_height, funding_timestamp = item
item = {
'channel_id': bh2u(chan.channel_id),
'type': 'channel_opening',
'label': self.wallet.get_label(funding_txid) or (_('Open channel') + ' ' + chan.get_id_for_log()),
'txid': funding_txid,
'amount_msat': chan.balance(LOCAL, ctn=0),
'direction': 'received',
'timestamp': funding_timestamp,
'fee_msat': None,
}
out[funding_txid] = item
item = chan.get_closing_height()
if item is None:
continue
closing_txid, closing_height, closing_timestamp = item
item = {
'channel_id': bh2u(chan.channel_id),
'txid': closing_txid,
'label': self.wallet.get_label(closing_txid) or (_('Close channel') + ' ' + chan.get_id_for_log()),
'type': 'channel_closure',
'amount_msat': -chan.balance_minus_outgoing_htlcs(LOCAL),
'direction': 'sent',
'timestamp': closing_timestamp,
'fee_msat': None,
}
out[closing_txid] = item
return out
def get_history(self):
out = list(self.get_lightning_history().values()) + list(self.get_onchain_history().values())
# sort by timestamp
out.sort(key=lambda x: (x.get('timestamp') or float("inf")))
balance_msat = 0
for item in out:
balance_msat += item['amount_msat']
item['balance_msat'] = balance_msat
return out
def get_and_inc_counter_for_channel_keys(self):
with self.lock:
ctr = self.db.get('lightning_channel_key_der_ctr', -1)
ctr += 1
self.db.put('lightning_channel_key_der_ctr', ctr)
self.wallet.save_db()
return ctr
def suggest_peer(self):
r = []
for node_id, peer in self.peers.items():
if not peer.is_initialized():
continue
if not all([chan.is_closed() for chan in peer.channels.values()]):
continue
r.append(node_id)
return random.choice(r) if r else None
def channels_for_peer(self, node_id):
assert type(node_id) is bytes
return {chan_id: chan for (chan_id, chan) in self.channels.items()
if chan.node_id == node_id}
def channel_state_changed(self, chan):
self.save_channel(chan)
util.trigger_callback('channel', chan)
def save_channel(self, chan):
assert type(chan) is Channel
if chan.config[REMOTE].next_per_commitment_point == chan.config[REMOTE].current_per_commitment_point:
raise Exception("Tried to save channel with next_point == current_point, this should not happen")
self.wallet.save_db()
util.trigger_callback('channel', chan)
def channel_by_txo(self, txo):
for chan in self.channels.values():
if chan.funding_outpoint.to_str() == txo:
return chan
async def on_channel_update(self, chan):
if chan.get_state() == ChannelState.OPEN and chan.should_be_closed_due_to_expiring_htlcs(self.network.get_local_height()):
self.logger.info(f"force-closing due to expiring htlcs")
await self.try_force_closing(chan.channel_id)
elif chan.get_state() == ChannelState.FUNDED:
peer = self._peers.get(chan.node_id)
if peer and peer.is_initialized():
peer.send_funding_locked(chan)
elif chan.get_state() == ChannelState.OPEN:
peer = self._peers.get(chan.node_id)
if peer:
await peer.maybe_update_fee(chan)
conf = self.lnwatcher.get_tx_height(chan.funding_outpoint.txid).conf
peer.on_network_update(chan, conf)
elif chan.get_state() == ChannelState.FORCE_CLOSING:
force_close_tx = chan.force_close_tx()
txid = force_close_tx.txid()
height = self.lnwatcher.get_tx_height(txid).height
if height == TX_HEIGHT_LOCAL:
self.logger.info('REBROADCASTING CLOSING TX')
await self.network.try_broadcasting(force_close_tx, 'force-close')
@log_exceptions
async def _open_channel_coroutine(self, *, connect_str: str, funding_tx: PartialTransaction,
funding_sat: int, push_sat: int,
password: Optional[str]) -> Tuple[Channel, PartialTransaction]:
peer = await self.add_peer(connect_str)
# will raise if init fails
await asyncio.wait_for(peer.initialized, LN_P2P_NETWORK_TIMEOUT)
chan, funding_tx = await peer.channel_establishment_flow(
password=password,
funding_tx=funding_tx,
funding_sat=funding_sat,
push_msat=push_sat * 1000,
temp_channel_id=os.urandom(32))
util.trigger_callback('channels_updated', self.wallet)
self.wallet.add_transaction(funding_tx) # save tx as local into the wallet
self.wallet.set_label(funding_tx.txid(), _('Open channel'))
if funding_tx.is_complete():
await self.network.try_broadcasting(funding_tx, 'open_channel')
return chan, funding_tx
def add_channel(self, chan):
with self.lock:
self._channels[chan.channel_id] = chan
self.lnwatcher.add_channel(chan.funding_outpoint.to_str(), chan.get_funding_address())
def add_new_channel(self, chan):
self.add_channel(chan)
channels_db = self.db.get_dict('channels')
channels_db[chan.channel_id.hex()] = chan.storage
for addr in chan.get_wallet_addresses_channel_might_want_reserved():
self.wallet.set_reserved_state_of_address(addr, reserved=True)
self.wallet.save_backup()
def mktx_for_open_channel(self, *, coins: Sequence[PartialTxInput], funding_sat: int,
fee_est=None) -> PartialTransaction:
dummy_address = ln_dummy_address()
outputs = [PartialTxOutput.from_address_and_value(dummy_address, funding_sat)]
tx = self.wallet.make_unsigned_transaction(
coins=coins,
outputs=outputs,
fee=fee_est)
tx.set_rbf(False)
return tx
def open_channel(self, *, connect_str: str, funding_tx: PartialTransaction,
funding_sat: int, push_amt_sat: int, password: str = None,
timeout: Optional[int] = 20) -> Tuple[Channel, PartialTransaction]:
if funding_sat > LN_MAX_FUNDING_SAT:
raise Exception(_("Requested channel capacity is over protocol allowed maximum."))
coro = self._open_channel_coroutine(connect_str=connect_str, funding_tx=funding_tx, funding_sat=funding_sat,
push_sat=push_amt_sat, password=password)
fut = asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop)
try:
chan, funding_tx = fut.result(timeout=timeout)
except concurrent.futures.TimeoutError:
raise Exception(_("open_channel timed out"))
return chan, funding_tx
def pay(self, invoice: str, amount_sat: int = None, *, attempts: int = 1) -> Tuple[bool, List[PaymentAttemptLog]]:
"""
Can be called from other threads
"""
coro = self._pay(invoice, amount_sat, attempts=attempts)
fut = asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop)
return fut.result()
def get_channel_by_short_id(self, short_channel_id: bytes) -> Optional[Channel]:
for chan in self.channels.values():
if chan.short_channel_id == short_channel_id:
return chan
@log_exceptions
async def _pay(self, invoice: str, amount_sat: int = None, *,
attempts: int = 1,
full_path: LNPaymentPath = None) -> Tuple[bool, List[PaymentAttemptLog]]:
lnaddr = self._check_invoice(invoice, amount_sat)
payment_hash = lnaddr.paymenthash
key = payment_hash.hex()
amount = int(lnaddr.amount * COIN)
status = self.get_payment_status(payment_hash)
if status == PR_PAID:
raise PaymentFailure(_("This invoice has been paid already"))
if status == PR_INFLIGHT:
raise PaymentFailure(_("A payment was already initiated for this invoice"))
info = PaymentInfo(lnaddr.paymenthash, amount, SENT, PR_UNPAID)
self.save_payment_info(info)
self.wallet.set_label(key, lnaddr.get_description())
self.logs[key] = log = []
success = False
reason = ''
for i in range(attempts):
try:
# note: path-finding runs in a separate thread so that we don't block the asyncio loop
# graph updates might occur during the computation
self.set_invoice_status(key, PR_ROUTING)
util.trigger_callback('invoice_status', key)
route = await run_in_thread(partial(self._create_route_from_invoice, lnaddr, full_path=full_path))
self.set_invoice_status(key, PR_INFLIGHT)
util.trigger_callback('invoice_status', key)
payment_attempt_log = await self._pay_to_route(route, lnaddr)
except Exception as e:
log.append(PaymentAttemptLog(success=False, exception=e))
self.set_invoice_status(key, PR_UNPAID)
reason = str(e)
break
log.append(payment_attempt_log)
success = payment_attempt_log.success
if success:
break
else:
reason = _('Failed after {} attempts').format(attempts)
util.trigger_callback('invoice_status', key)
if success:
util.trigger_callback('payment_succeeded', key)
else:
util.trigger_callback('payment_failed', key, reason)
return success, log
async def _pay_to_route(self, route: LNPaymentRoute, lnaddr: LnAddr) -> PaymentAttemptLog:
short_channel_id = route[0].short_channel_id
chan = self.get_channel_by_short_id(short_channel_id)
peer = self._peers.get(route[0].node_id)
if not peer:
raise Exception('Dropped peer')
await peer.initialized
htlc = peer.pay(route=route,
chan=chan,
amount_msat=int(lnaddr.amount * COIN * 1000),
payment_hash=lnaddr.paymenthash,
min_final_cltv_expiry=lnaddr.get_min_final_cltv_expiry(),
payment_secret=lnaddr.payment_secret)
util.trigger_callback('htlc_added', htlc, lnaddr, SENT)
payment_attempt = await self.await_payment(lnaddr.paymenthash)
if payment_attempt.success:
failure_log = None
else:
if payment_attempt.error_bytes:
# TODO "decode_onion_error" might raise, catch and maybe blacklist/penalise someone?
failure_msg, sender_idx = chan.decode_onion_error(payment_attempt.error_bytes, route, htlc.htlc_id)
is_blacklisted = self.handle_error_code_from_failed_htlc(failure_msg, sender_idx, route, peer)
if is_blacklisted:
# blacklist channel after reporter node
# TODO this should depend on the error (even more granularity)
# also, we need finer blacklisting (directed edges; nodes)
try:
short_chan_id = route[sender_idx + 1].short_channel_id
except IndexError:
self.logger.info("payment destination reported error")
else:
self.network.path_finder.add_to_blacklist(short_chan_id)
else:
# probably got "update_fail_malformed_htlc". well... who to penalise now?
assert payment_attempt.failure_message is not None
sender_idx = None
failure_msg = payment_attempt.failure_message
is_blacklisted = False
failure_log = PaymentAttemptFailureDetails(sender_idx=sender_idx,
failure_msg=failure_msg,
is_blacklisted=is_blacklisted)
return PaymentAttemptLog(route=route,
success=payment_attempt.success,
preimage=payment_attempt.preimage,
failure_details=failure_log)
def handle_error_code_from_failed_htlc(self, failure_msg, sender_idx, route, peer):
code, data = failure_msg.code, failure_msg.data
self.logger.info(f"UPDATE_FAIL_HTLC {repr(code)} {data}")
self.logger.info(f"error reported by {bh2u(route[sender_idx].node_id)}")
# handle some specific error codes
failure_codes = {
OnionFailureCode.TEMPORARY_CHANNEL_FAILURE: 0,
OnionFailureCode.AMOUNT_BELOW_MINIMUM: 8,
OnionFailureCode.FEE_INSUFFICIENT: 8,
OnionFailureCode.INCORRECT_CLTV_EXPIRY: 4,
OnionFailureCode.EXPIRY_TOO_SOON: 0,
OnionFailureCode.CHANNEL_DISABLED: 2,
}
if code in failure_codes:
offset = failure_codes[code]
channel_update_len = int.from_bytes(data[offset:offset+2], byteorder="big")
channel_update_as_received = data[offset+2: offset+2+channel_update_len]
channel_update_typed = (258).to_bytes(length=2, byteorder="big") + channel_update_as_received
# note: some nodes put channel updates in error msgs with the leading msg_type already there.
# we try decoding both ways here.
try:
message_type, payload = decode_msg(channel_update_typed)
assert payload['chain_hash'] == constants.net.rev_genesis_bytes()
payload['raw'] = channel_update_typed
except: # FIXME: too broad
try:
message_type, payload = decode_msg(channel_update_as_received)
payload['raw'] = channel_update_as_received
assert payload['chain_hash'] != constants.net.rev_genesis_bytes()
except:
self.logger.info(f'could not decode channel_update for failed htlc: {channel_update_as_received.hex()}')
return True
r = self.channel_db.add_channel_update(payload)
blacklist = False
short_channel_id = ShortChannelID(payload['short_channel_id'])
if r == UpdateStatus.GOOD:
self.logger.info(f"applied channel update to {short_channel_id}")
peer.maybe_save_remote_update(payload)
elif r == UpdateStatus.ORPHANED:
# maybe it is a private channel (and data in invoice was outdated)
self.logger.info(f"Could not find {short_channel_id}. maybe update is for private channel?")
start_node_id = route[sender_idx].node_id
self.channel_db.add_channel_update_for_private_channel(payload, start_node_id)
elif r == UpdateStatus.EXPIRED:
blacklist = True
elif r == UpdateStatus.DEPRECATED:
self.logger.info(f'channel update is not more recent.')
blacklist = True
elif r == UpdateStatus.UNCHANGED:
blacklist = True
else:
blacklist = True
return blacklist
@staticmethod
def _check_invoice(invoice: str, amount_sat: int = None) -> LnAddr:
addr = lndecode(invoice, expected_hrp=constants.net.SEGWIT_HRP)
if addr.is_expired():
raise InvoiceError(_("This invoice has expired"))
if amount_sat:
addr.amount = Decimal(amount_sat) / COIN
if addr.amount is None:
raise InvoiceError(_("Missing amount"))
if addr.get_min_final_cltv_expiry() > lnutil.NBLOCK_CLTV_EXPIRY_TOO_FAR_INTO_FUTURE:
raise InvoiceError("{}\n{}".format(
_("Invoice wants us to risk locking funds for unreasonably long."),
f"min_final_cltv_expiry: {addr.get_min_final_cltv_expiry()}"))
return addr
@profiler
def _create_route_from_invoice(self, decoded_invoice: 'LnAddr',
*, full_path: LNPaymentPath = None) -> LNPaymentRoute:
amount_msat = int(decoded_invoice.amount * COIN * 1000)
invoice_pubkey = decoded_invoice.pubkey.serialize()
# use 'r' field from invoice
route = None # type: Optional[LNPaymentRoute]
# only want 'r' tags
r_tags = list(filter(lambda x: x[0] == 'r', decoded_invoice.tags))
# strip the tag type, it's implicitly 'r' now
r_tags = list(map(lambda x: x[1], r_tags))
# if there are multiple hints, we will use the first one that works,
# from a random permutation
random.shuffle(r_tags)
channels = list(self.channels.values())
scid_to_my_channels = {chan.short_channel_id: chan for chan in channels
if chan.short_channel_id is not None}
for private_route in r_tags:
if len(private_route) == 0:
continue
if len(private_route) > NUM_MAX_EDGES_IN_PAYMENT_PATH:
continue
border_node_pubkey = private_route[0][0]
if full_path:
# user pre-selected path. check that end of given path coincides with private_route:
if [edge.short_channel_id for edge in full_path[-len(private_route):]] != [edge[1] for edge in private_route]:
continue
path = full_path[:-len(private_route)]
else:
# find path now on public graph, to border node
path = self.network.path_finder.find_path_for_payment(self.node_keypair.pubkey, border_node_pubkey, amount_msat,
my_channels=scid_to_my_channels)
if not path:
continue
try:
route = self.network.path_finder.create_route_from_path(path, self.node_keypair.pubkey,
my_channels=scid_to_my_channels)
except NoChannelPolicy:
continue
# we need to shift the node pubkey by one towards the destination:
private_route_nodes = [edge[0] for edge in private_route][1:] + [invoice_pubkey]
private_route_rest = [edge[1:] for edge in private_route]
prev_node_id = border_node_pubkey
for node_pubkey, edge_rest in zip(private_route_nodes, private_route_rest):
short_channel_id, fee_base_msat, fee_proportional_millionths, cltv_expiry_delta = edge_rest
short_channel_id = ShortChannelID(short_channel_id)
# if we have a routing policy for this edge in the db, that takes precedence,
# as it is likely from a previous failure
channel_policy = self.channel_db.get_policy_for_node(short_channel_id=short_channel_id,
node_id=prev_node_id,
my_channels=scid_to_my_channels)
if channel_policy:
fee_base_msat = channel_policy.fee_base_msat
fee_proportional_millionths = channel_policy.fee_proportional_millionths
cltv_expiry_delta = channel_policy.cltv_expiry_delta
node_info = self.channel_db.get_node_info_for_node_id(node_id=node_pubkey)
route.append(RouteEdge(node_id=node_pubkey,
short_channel_id=short_channel_id,
fee_base_msat=fee_base_msat,
fee_proportional_millionths=fee_proportional_millionths,
cltv_expiry_delta=cltv_expiry_delta,
node_features=node_info.features if node_info else 0))
prev_node_id = node_pubkey
# test sanity
if not is_route_sane_to_use(route, amount_msat, decoded_invoice.get_min_final_cltv_expiry()):
self.logger.info(f"rejecting insane route {route}")
route = None
continue
break
# if could not find route using any hint; try without hint now
if route is None:
if full_path: # user pre-selected path
path = full_path
else: # find path now
path = self.network.path_finder.find_path_for_payment(self.node_keypair.pubkey, invoice_pubkey, amount_msat,
my_channels=scid_to_my_channels)
if not path:
raise NoPathFound()
route = self.network.path_finder.create_route_from_path(path, self.node_keypair.pubkey,
my_channels=scid_to_my_channels)
if not is_route_sane_to_use(route, amount_msat, decoded_invoice.get_min_final_cltv_expiry()):
self.logger.info(f"rejecting insane route {route}")
raise NoPathFound()
assert len(route) > 0
if route[-1].node_id != invoice_pubkey:
raise LNPathInconsistent("last node_id != invoice pubkey")
# add features from invoice
invoice_features = decoded_invoice.get_tag('9') or 0
route[-1].node_features |= invoice_features
return route
def add_request(self, amount_sat, message, expiry):
coro = self._add_request_coro(amount_sat, message, expiry)
fut = asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop)
try:
return fut.result(timeout=5)
except concurrent.futures.TimeoutError:
raise Exception(_("add invoice timed out"))
@log_exceptions
async def _add_request_coro(self, amount_sat: Optional[int], message, expiry: int):
timestamp = int(time.time())
routing_hints = await self._calc_routing_hints_for_invoice(amount_sat)
if not routing_hints:
self.logger.info("Warning. No routing hints added to invoice. "
"Other clients will likely not be able to send to us.")
payment_preimage = os.urandom(32)
payment_hash = sha256(payment_preimage)
info = PaymentInfo(payment_hash, amount_sat, RECEIVED, PR_UNPAID)
amount_btc = amount_sat/Decimal(COIN) if amount_sat else None
if expiry == 0:
# hack: BOLT-11 is not really clear on what an expiry of 0 means.
# It probably interprets it as 0 seconds, so already expired...
# Our higher level invoices code however uses 0 for "never".
# Hence set some high expiration here
expiry = 100 * 365 * 24 * 60 * 60 # 100 years
lnaddr = LnAddr(paymenthash=payment_hash,
amount=amount_btc,
tags=[('d', message),
('c', MIN_FINAL_CLTV_EXPIRY_FOR_INVOICE),
('x', expiry),
('9', self.features.for_invoice())]
+ routing_hints,
date=timestamp,
payment_secret=derive_payment_secret_from_payment_preimage(payment_preimage))
invoice = lnencode(lnaddr, self.node_keypair.privkey)
key = bh2u(lnaddr.paymenthash)
req = LNInvoice.from_bech32(invoice)
self.save_preimage(payment_hash, payment_preimage)
self.save_payment_info(info)
self.wallet.add_payment_request(req)
self.wallet.set_label(key, message)
return key
def save_preimage(self, payment_hash: bytes, preimage: bytes):
assert sha256(preimage) == payment_hash
self.preimages[bh2u(payment_hash)] = bh2u(preimage)
self.wallet.save_db()
def get_preimage(self, payment_hash: bytes) -> Optional[bytes]:
r = self.preimages.get(bh2u(payment_hash))
return bfh(r) if r else None
def get_payment_info(self, payment_hash: bytes) -> Optional[PaymentInfo]:
"""returns None if payment_hash is a payment we are forwarding"""
key = payment_hash.hex()
with self.lock:
if key in self.payments:
amount, direction, status = self.payments[key]
return PaymentInfo(payment_hash, amount, direction, status)
def save_payment_info(self, info: PaymentInfo) -> None:
key = info.payment_hash.hex()
assert info.status in SAVED_PR_STATUS
with self.lock:
self.payments[key] = info.amount, info.direction, info.status
self.wallet.save_db()
def get_payment_status(self, payment_hash):
info = self.get_payment_info(payment_hash)
return info.status if info else PR_UNPAID
def get_invoice_status(self, invoice):
key = invoice.rhash
log = self.logs[key]
if key in self.is_routing:
return PR_ROUTING
# status may be PR_FAILED
status = self.get_payment_status(bfh(key))
if status == PR_UNPAID and log:
status = PR_FAILED
return status
def set_invoice_status(self, key, status):
if status == PR_ROUTING:
self.is_routing.add(key)
elif key in self.is_routing:
self.is_routing.remove(key)
if status in SAVED_PR_STATUS:
self.set_payment_status(bfh(key), status)
async def await_payment(self, payment_hash: bytes) -> BarePaymentAttemptLog:
payment_attempt = await self.pending_payments[payment_hash]
self.pending_payments.pop(payment_hash)
return payment_attempt
def set_payment_status(self, payment_hash: bytes, status):
info = self.get_payment_info(payment_hash)
if info is None:
# if we are forwarding
return
info = info._replace(status=status)
self.save_payment_info(info)
def payment_failed(self, chan, payment_hash: bytes, error_bytes: bytes, failure_message):
self.set_payment_status(payment_hash, PR_UNPAID)
f = self.pending_payments.get(payment_hash)
if f and not f.cancelled():
payment_attempt = BarePaymentAttemptLog(
success=False,
error_bytes=error_bytes,
failure_message=failure_message)
f.set_result(payment_attempt)
else:
chan.logger.info('received unexpected payment_failed, probably from previous session')
key = payment_hash.hex()
util.trigger_callback('invoice_status', key)
util.trigger_callback('payment_failed', key, '')
util.trigger_callback('ln_payment_failed', payment_hash, chan.channel_id)
def payment_sent(self, chan, payment_hash: bytes):
self.set_payment_status(payment_hash, PR_PAID)
preimage = self.get_preimage(payment_hash)
f = self.pending_payments.get(payment_hash)
if f and not f.cancelled():
payment_attempt = BarePaymentAttemptLog(
success=True,
preimage=preimage)
f.set_result(payment_attempt)
else:
chan.logger.info('received unexpected payment_sent, probably from previous session')
key = payment_hash.hex()
util.trigger_callback('invoice_status', key)
util.trigger_callback('payment_succeeded', key)
util.trigger_callback('ln_payment_completed', payment_hash, chan.channel_id)
def payment_received(self, chan, payment_hash: bytes):
self.set_payment_status(payment_hash, PR_PAID)
util.trigger_callback('request_status', payment_hash.hex(), PR_PAID)
util.trigger_callback('ln_payment_completed', payment_hash, chan.channel_id)
async def _calc_routing_hints_for_invoice(self, amount_sat: Optional[int]):
"""calculate routing hints (BOLT-11 'r' field)"""
routing_hints = []
channels = list(self.channels.values())
random.shuffle(channels) # not sure this has any benefit but let's not leak channel order
scid_to_my_channels = {chan.short_channel_id: chan for chan in channels
if chan.short_channel_id is not None}
if amount_sat:
amount_msat = 1000 * amount_sat
else:
# for no amt invoices, check if channel can receive at least 1 msat
amount_msat = 1
# note: currently we add *all* our channels; but this might be a privacy leak?
for chan in channels:
# do minimal filtering of channels.
# we include channels that cannot *right now* receive (e.g. peer disconnected or balance insufficient)
if not (chan.is_open() and not chan.is_frozen_for_receiving()):
continue
if amount_msat > 1000 * chan.constraints.capacity:
continue
chan_id = chan.short_channel_id
assert isinstance(chan_id, bytes), chan_id
channel_info = self.channel_db.get_channel_info(chan_id, my_channels=scid_to_my_channels)
# note: as a fallback, if we don't have a channel update for the
# incoming direction of our private channel, we fill the invoice with garbage.
# the sender should still be able to pay us, but will incur an extra round trip
# (they will get the channel update from the onion error)
# at least, that's the theory. https://github.com/lightningnetwork/lnd/issues/2066
fee_base_msat = fee_proportional_millionths = 0
cltv_expiry_delta = 1 # lnd won't even try with zero
missing_info = True
if channel_info:
policy = self.channel_db.get_policy_for_node(channel_info.short_channel_id, chan.node_id,
my_channels=scid_to_my_channels)
if policy:
fee_base_msat = policy.fee_base_msat
fee_proportional_millionths = policy.fee_proportional_millionths
cltv_expiry_delta = policy.cltv_expiry_delta
missing_info = False
if missing_info:
self.logger.info(f"Warning. Missing channel update for our channel {chan_id}; "
f"filling invoice with incorrect data.")
routing_hints.append(('r', [(chan.node_id,
chan_id,
fee_base_msat,
fee_proportional_millionths,
cltv_expiry_delta)]))
return routing_hints
def delete_payment(self, payment_hash_hex: str):
try:
with self.lock:
del self.payments[payment_hash_hex]
except KeyError:
return
self.wallet.save_db()
def get_balance(self):
with self.lock:
return Decimal(sum(chan.balance(LOCAL) if not chan.is_closed() else 0
for chan in self.channels.values())) / 1000
def num_sats_can_send(self) -> Union[Decimal, int]:
with self.lock:
return Decimal(max(chan.available_to_spend(LOCAL) if chan.is_open() else 0
for chan in self.channels.values()))/1000 if self.channels else 0
def num_sats_can_receive(self) -> Union[Decimal, int]:
with self.lock:
return Decimal(max(chan.available_to_spend(REMOTE) if chan.is_open() else 0
for chan in self.channels.values()))/1000 if self.channels else 0
def can_pay_invoice(self, invoice):
return invoice.amount <= self.num_sats_can_send()
def can_receive_invoice(self, invoice):
return invoice.amount <= self.num_sats_can_receive()
async def close_channel(self, chan_id):
chan = self._channels[chan_id]
peer = self._peers[chan.node_id]
return await peer.close_channel(chan_id)
async def force_close_channel(self, chan_id):
# returns txid or raises
chan = self._channels[chan_id]
tx = chan.force_close_tx()
await self.network.broadcast_transaction(tx)
chan.set_state(ChannelState.FORCE_CLOSING)
return tx.txid()
async def try_force_closing(self, chan_id):
# fails silently but sets the state, so that we will retry later
chan = self._channels[chan_id]
tx = chan.force_close_tx()
chan.set_state(ChannelState.FORCE_CLOSING)
await self.network.try_broadcasting(tx, 'force-close')
def remove_channel(self, chan_id):
chan = self._channels[chan_id]
assert chan.get_state() == ChannelState.REDEEMED
with self.lock:
self._channels.pop(chan_id)
self.db.get('channels').pop(chan_id.hex())
for addr in chan.get_wallet_addresses_channel_might_want_reserved():
self.wallet.set_reserved_state_of_address(addr, reserved=False)
util.trigger_callback('channels_updated', self.wallet)
util.trigger_callback('wallet_updated', self.wallet)
@ignore_exceptions
@log_exceptions
async def reestablish_peer_for_given_channel(self, chan: Channel) -> None:
now = time.time()
peer_addresses = []
# will try last good address first, from gossip
last_good_addr = self.channel_db.get_last_good_address(chan.node_id)
if last_good_addr:
peer_addresses.append(last_good_addr)
# will try addresses for node_id from gossip
addrs_from_gossip = self.channel_db.get_node_addresses(chan.node_id) or []
for host, port, ts in addrs_from_gossip:
peer_addresses.append(LNPeerAddr(host, port, chan.node_id))
# will try addresses stored in channel storage
peer_addresses += list(chan.get_peer_addresses())
# Done gathering addresses.
# Now select first one that has not failed recently.
for peer in peer_addresses:
if self._can_retry_addr(peer, urgent=True, now=now):
await self._add_peer(peer.host, peer.port, peer.pubkey)
return
async def reestablish_peers_and_channels(self):
while True:
await asyncio.sleep(1)
for chan in self.channels.values():
if chan.is_closed():
continue
# reestablish
if not chan.should_try_to_reestablish_peer():
continue
peer = self._peers.get(chan.node_id, None)
if peer:
await peer.taskgroup.spawn(peer.reestablish_channel(chan))
else:
await self.taskgroup.spawn(self.reestablish_peer_for_given_channel(chan))
def current_feerate_per_kw(self):
from .simple_config import FEE_LN_ETA_TARGET, FEERATE_FALLBACK_STATIC_FEE, FEERATE_REGTEST_HARDCODED
if constants.net is constants.BitcoinRegtest:
return FEERATE_REGTEST_HARDCODED // 4
feerate_per_kvbyte = self.network.config.eta_target_to_fee(FEE_LN_ETA_TARGET)
if feerate_per_kvbyte is None:
feerate_per_kvbyte = FEERATE_FALLBACK_STATIC_FEE
return max(253, feerate_per_kvbyte // 4)
def create_channel_backup(self, channel_id):
chan = self._channels[channel_id]
peer_addresses = list(chan.get_peer_addresses())
peer_addr = peer_addresses[0]
return ChannelBackupStorage(
node_id = chan.node_id,
privkey = self.node_keypair.privkey,
funding_txid = chan.funding_outpoint.txid,
funding_index = chan.funding_outpoint.output_index,
funding_address = chan.get_funding_address(),
host = peer_addr.host,
port = peer_addr.port,
is_initiator = chan.constraints.is_initiator,
channel_seed = chan.config[LOCAL].channel_seed,
local_delay = chan.config[LOCAL].to_self_delay,
remote_delay = chan.config[REMOTE].to_self_delay,
remote_revocation_pubkey = chan.config[REMOTE].revocation_basepoint.pubkey,
remote_payment_pubkey = chan.config[REMOTE].payment_basepoint.pubkey)
def export_channel_backup(self, channel_id):
xpub = self.wallet.get_fingerprint()
backup_bytes = self.create_channel_backup(channel_id).to_bytes()
assert backup_bytes == ChannelBackupStorage.from_bytes(backup_bytes).to_bytes(), "roundtrip failed"
encrypted = pw_encode_bytes(backup_bytes, xpub, version=PW_HASH_VERSION_LATEST)
assert backup_bytes == pw_decode_bytes(encrypted, xpub, version=PW_HASH_VERSION_LATEST), "encrypt failed"
return encrypted
class LNBackups(Logger):
def __init__(self, wallet: 'Abstract_Wallet'):
Logger.__init__(self)
self.features = LnFeatures(0)
self.features |= LnFeatures.OPTION_DATA_LOSS_PROTECT_OPT
self.features |= LnFeatures.OPTION_STATIC_REMOTEKEY_OPT
self.taskgroup = SilentTaskGroup()
self.lock = threading.RLock()
self.wallet = wallet
self.db = wallet.db
self.channel_backups = {}
for channel_id, cb in self.db.get_dict("channel_backups").items():
self.channel_backups[bfh(channel_id)] = ChannelBackup(cb, sweep_address=self.sweep_address, lnworker=self)
@property
def sweep_address(self) -> str:
# TODO possible address-reuse
return self.wallet.get_new_sweep_address_for_channel()
def channel_state_changed(self, chan):
util.trigger_callback('channel', chan)
def peer_closed(self, chan):
pass
async def on_channel_update(self, chan):
pass
def channel_by_txo(self, txo):
with self.lock:
channel_backups = list(self.channel_backups.values())
for chan in channel_backups:
if chan.funding_outpoint.to_str() == txo:
return chan
def start_network(self, network: 'Network'):
assert network
self.lnwatcher = LNWalletWatcher(self, network)
self.lnwatcher.start_network(network)
self.network = network
for cb in self.channel_backups.values():
self.lnwatcher.add_channel(cb.funding_outpoint.to_str(), cb.get_funding_address())
def stop(self):
self.lnwatcher.stop()
self.lnwatcher = None
def import_channel_backup(self, encrypted):
xpub = self.wallet.get_fingerprint()
decrypted = pw_decode_bytes(encrypted, xpub, version=PW_HASH_VERSION_LATEST)
cb_storage = ChannelBackupStorage.from_bytes(decrypted)
channel_id = cb_storage.channel_id().hex()
d = self.db.get_dict("channel_backups")
if channel_id in d:
raise Exception('Channel already in wallet')
d[channel_id] = cb_storage
self.channel_backups[bfh(channel_id)] = cb = ChannelBackup(cb_storage, sweep_address=self.sweep_address, lnworker=self)
self.wallet.save_db()
util.trigger_callback('channels_updated', self.wallet)
self.lnwatcher.add_channel(cb.funding_outpoint.to_str(), cb.get_funding_address())
def remove_channel_backup(self, channel_id):
d = self.db.get_dict("channel_backups")
if channel_id.hex() not in d:
raise Exception('Channel not found')
d.pop(channel_id.hex())
self.channel_backups.pop(channel_id)
self.wallet.save_db()
util.trigger_callback('channels_updated', self.wallet)
@log_exceptions
async def request_force_close(self, channel_id):
cb = self.channel_backups[channel_id].cb
peer_addr = LNPeerAddr(cb.host, cb.port, cb.node_id)
transport = LNTransport(cb.privkey, peer_addr,
proxy=self.network.proxy)
peer = Peer(self, cb.node_id, transport)
await self.taskgroup.spawn(peer._message_loop())
await peer.initialized
await self.taskgroup.spawn(peer.trigger_force_close(channel_id))