import json import binascii import asyncio import os from decimal import Decimal import threading from collections import defaultdict from . import constants from .bitcoin import sha256, COIN from .util import bh2u, bfh, PrintError from .constants import set_testnet, set_simnet from .lnbase import Peer, privkey_to_pubkey from .lightning_payencode.lnaddr import lnencode, LnAddr, lndecode from .ecc import der_sig_from_sig_string from .transaction import Transaction from .lnhtlc import HTLCStateMachine from .lnutil import Outpoint, calc_short_channel_id # hardcoded nodes node_list = [ ('ecdsa.net', '9735', '038370f0e7a03eded3e1d41dc081084a87f0afa1c5b22090b4f3abb391eb15d8ff'), ] class LNWorker(PrintError): def __init__(self, wallet, network): self.wallet = wallet self.network = network pk = wallet.storage.get('lightning_privkey') if pk is None: pk = bh2u(os.urandom(32)) wallet.storage.put('lightning_privkey', pk) wallet.storage.write() self.privkey = bfh(pk) self.pubkey = privkey_to_pubkey(self.privkey) self.config = network.config self.peers = {} self.channels = {x.channel_id: x for x in map(HTLCStateMachine, wallet.storage.get("channels", []))} self.invoices = wallet.storage.get('lightning_invoices', {}) peer_list = network.config.get('lightning_peers', node_list) self.channel_state = {chan.channel_id: "DISCONNECTED" for chan in self.channels.values()} for chan_id, chan in self.channels.items(): self.network.lnwatcher.watch_channel(chan, self.on_channel_utxos) for host, port, pubkey in peer_list: self.add_peer(host, int(port), bfh(pubkey)) # wait until we see confirmations self.network.register_callback(self.on_network_update, ['updated', 'verified']) # thread safe self.on_network_update('updated') # shortcut (don't block) if funding tx locked and verified def channels_for_peer(self, node_id): assert type(node_id) is bytes return {x: y for (x, y) in self.channels.items() if y.node_id == node_id} def add_peer(self, host, port, node_id): peer = Peer(self, host, int(port), node_id, request_initial_sync=self.config.get("request_initial_sync", True)) self.network.futures.append(asyncio.run_coroutine_threadsafe(peer.main_loop(), asyncio.get_event_loop())) self.peers[node_id] = peer self.lock = threading.Lock() def save_channel(self, openchannel): assert type(openchannel) is HTLCStateMachine if openchannel.channel_id not in self.channel_state: self.channel_state[openchannel.channel_id] = "OPENING" self.channels[openchannel.channel_id] = openchannel for node_id, peer in self.peers.items(): peer.channels = self.channels_for_peer(node_id) if openchannel.remote_state.next_per_commitment_point == openchannel.remote_state.current_per_commitment_point: raise Exception("Tried to save channel with next_point == current_point, this should not happen") dumped = [x.serialize() for x in self.channels.values()] self.wallet.storage.put("channels", dumped) self.wallet.storage.write() self.network.trigger_callback('channel', openchannel) def save_short_chan_id(self, chan): """ Checks if the Funding TX has been mined. If it has save the short channel ID to disk and return the new OpenChannel. If the Funding TX has not been mined, return None """ assert self.channel_state[chan.channel_id] in ["OPEN", "OPENING"] peer = self.peers[chan.node_id] conf = self.wallet.get_tx_height(chan.funding_outpoint.txid)[1] if conf >= chan.constraints.funding_txn_minimum_depth: block_height, tx_pos = self.wallet.get_txpos(chan.funding_outpoint.txid) if tx_pos == -1: self.print_error('funding tx is not yet SPV verified.. but there are ' 'already enough confirmations (currently {})'.format(conf)) return False chan.short_channel_id = calc_short_channel_id(block_height, tx_pos, chan.funding_outpoint.output_index) self.save_channel(chan) return True return False def on_channel_utxos(self, chan, utxos): outpoints = [Outpoint(x["tx_hash"], x["tx_pos"]) for x in utxos] if chan.funding_outpoint not in outpoints: self.channel_state[chan.channel_id] = "CLOSED" elif self.channel_state[chan.channel_id] == 'DISCONNECTED': peer = self.peers[chan.node_id] coro = peer.reestablish_channel(chan) asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop) def on_network_update(self, event, *args): for chan in self.channels.values(): peer = self.peers[chan.node_id] if self.channel_state[chan.channel_id] == "OPENING": res = self.save_short_chan_id(chan) if not res: self.print_error("network update but funding tx is still not at sufficient depth") continue # this results in the channel being marked OPEN peer.funding_locked(chan) elif self.channel_state[chan.channel_id] == "OPEN": conf = self.wallet.get_tx_height(chan.funding_outpoint.txid)[1] peer.on_network_update(chan, conf) async def _open_channel_coroutine(self, node_id, amount_sat, push_sat, password): if node_id not in self.peers: node = self.network.lightning_nodes.get(node_id) if node is None: return "node not found, peers available are: " + str(self.network.lightning_nodes.keys()) host, port = node['addresses'][0] self.add_peer(host, port, node_id) peer = self.peers[node_id] openingchannel = await peer.channel_establishment_flow(self.wallet, self.config, password, amount_sat, push_sat * 1000, temp_channel_id=os.urandom(32)) self.save_channel(openingchannel) self.on_channels_updated() def on_channels_updated(self): self.network.trigger_callback('channels') def open_channel(self, node_id, local_amt_sat, push_amt_sat, pw): coro = self._open_channel_coroutine(node_id, local_amt_sat, push_amt_sat, None if pw == "" else pw) return asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop) def pay(self, invoice): addr = lndecode(invoice, expected_hrp=constants.net.SEGWIT_HRP) payment_hash = addr.paymenthash invoice_pubkey = addr.pubkey.serialize() amount_msat = int(addr.amount * COIN * 1000) path = self.network.path_finder.find_path_for_payment(self.pubkey, invoice_pubkey, amount_msat) if path is None: raise Exception("No path found") node_id, short_channel_id = path[0] peer = self.peers[node_id] for chan in self.channels.values(): if chan.short_channel_id == short_channel_id: break else: raise Exception("ChannelDB returned path with short_channel_id that is not in channel list") coro = peer.pay(path, chan, amount_msat, payment_hash, invoice_pubkey, addr.min_final_cltv_expiry) return asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop) def add_invoice(self, amount_sat, message): payment_preimage = os.urandom(32) RHASH = sha256(payment_preimage) amount_btc = amount_sat/Decimal(COIN) if amount_sat else None pay_req = lnencode(LnAddr(RHASH, amount_btc, tags=[('d', message)]), self.privkey) self.invoices[bh2u(payment_preimage)] = pay_req self.wallet.storage.put('lightning_invoices', self.invoices) self.wallet.storage.write() return pay_req def delete_invoice(self, payreq_key): try: del self.invoices[payreq_key] except KeyError: return self.wallet.storage.put('lightning_invoices', self.invoices) self.wallet.storage.write() def list_channels(self): return [str(x) for x in self.channels] def close_channel(self, chan_id): chan = self.channels[chan_id] # local_commitment always gives back the next expected local_commitment, # but in this case, we want the current one. So substract one ctn number old_local_state = chan.local_state chan.local_state=chan.local_state._replace(ctn=chan.local_state.ctn - 1) tx = chan.local_commitment chan.local_state = old_local_state tx.sign({bh2u(chan.local_config.multisig_key.pubkey): (chan.local_config.multisig_key.privkey, True)}) remote_sig = chan.local_state.current_commitment_signature remote_sig = der_sig_from_sig_string(remote_sig) + b"\x01" none_idx = tx._inputs[0]["signatures"].index(None) tx.add_signature_to_txin(0, none_idx, bh2u(remote_sig)) assert tx.is_complete() return self.network.broadcast_transaction(tx)