# -*- coding: utf-8 -*- import traceback from enum import IntEnum from typing import Sequence, Optional from PyQt5 import QtCore, QtGui from PyQt5.QtCore import Qt from PyQt5.QtWidgets import (QMenu, QHBoxLayout, QLabel, QVBoxLayout, QGridLayout, QLineEdit, QPushButton, QAbstractItemView) from PyQt5.QtGui import QFont, QStandardItem, QBrush from electrum.util import bh2u, NotEnoughFunds, NoDynamicFeeEstimates from electrum.i18n import _ from electrum.lnchannel import AbstractChannel, PeerState from electrum.wallet import Abstract_Wallet from electrum.lnutil import LOCAL, REMOTE, format_short_channel_id, LN_MAX_FUNDING_SAT from electrum.lnworker import LNWallet from .util import (MyTreeView, WindowModalDialog, Buttons, OkButton, CancelButton, EnterButton, WaitingDialog, MONOSPACE_FONT, ColorScheme) from .amountedit import BTCAmountEdit, FreezableLineEdit ROLE_CHANNEL_ID = Qt.UserRole class ChannelsList(MyTreeView): update_rows = QtCore.pyqtSignal(Abstract_Wallet) update_single_row = QtCore.pyqtSignal(Abstract_Wallet, AbstractChannel) gossip_db_loaded = QtCore.pyqtSignal() class Columns(IntEnum): SHORT_CHANID = 0 NODE_ALIAS = 1 LOCAL_BALANCE = 2 REMOTE_BALANCE = 3 CHANNEL_STATUS = 4 headers = { Columns.SHORT_CHANID: _('Short Channel ID'), Columns.NODE_ALIAS: _('Node alias'), Columns.LOCAL_BALANCE: _('Local'), Columns.REMOTE_BALANCE: _('Remote'), Columns.CHANNEL_STATUS: _('Status'), } filter_columns = [ Columns.SHORT_CHANID, Columns.NODE_ALIAS, Columns.CHANNEL_STATUS, ] _default_item_bg_brush = None # type: Optional[QBrush] def __init__(self, parent): super().__init__(parent, self.create_menu, stretch_column=self.Columns.NODE_ALIAS, editable_columns=[]) self.setModel(QtGui.QStandardItemModel(self)) self.setSelectionMode(QAbstractItemView.ExtendedSelection) self.main_window = parent self.gossip_db_loaded.connect(self.on_gossip_db) self.update_rows.connect(self.do_update_rows) self.update_single_row.connect(self.do_update_single_row) self.network = self.parent.network self.lnworker = self.parent.wallet.lnworker self.lnbackups = self.parent.wallet.lnbackups self.setSortingEnabled(True) def format_fields(self, chan): labels = {} for subject in (REMOTE, LOCAL): bal_minus_htlcs = chan.balance_minus_outgoing_htlcs(subject)//1000 label = self.parent.format_amount(bal_minus_htlcs) other = subject.inverted() bal_other = chan.balance(other)//1000 bal_minus_htlcs_other = chan.balance_minus_outgoing_htlcs(other)//1000 if bal_other != bal_minus_htlcs_other: label += ' (+' + self.parent.format_amount(bal_other - bal_minus_htlcs_other) + ')' labels[subject] = label status = chan.get_state_for_GUI() closed = chan.is_closed() if self.parent.network.is_lightning_running(): node_info = self.parent.network.channel_db.get_node_info_for_node_id(chan.node_id) node_alias = (node_info.alias if node_info else '') or '' else: node_alias = '' return [ chan.short_id_for_GUI(), node_alias, '' if closed else labels[LOCAL], '' if closed else labels[REMOTE], status ] def on_success(self, txid): self.main_window.show_error('Channel closed' + '\n' + txid) def on_failure(self, exc_info): type_, e, tb = exc_info traceback.print_tb(tb) self.main_window.show_error('Failed to close channel:\n{}'.format(repr(e))) def close_channel(self, channel_id): msg = _('Close channel?') if not self.parent.question(msg): return def task(): coro = self.lnworker.close_channel(channel_id) return self.network.run_from_another_thread(coro) WaitingDialog(self, 'please wait..', task, self.on_success, self.on_failure) def force_close(self, channel_id): chan = self.lnworker.channels[channel_id] to_self_delay = chan.config[REMOTE].to_self_delay msg = _('Force-close channel?') + '\n\n'\ + _('Funds retrieved from this channel will not be available before {} blocks after forced closure.').format(to_self_delay) + ' '\ + _('After that delay, funds will be sent to an address derived from your wallet seed.') + '\n\n'\ + _('In the meantime, channel funds will not be recoverable from your seed, and might be lost if you lose your wallet.') + ' '\ + _('To prevent that, you should have a backup of this channel on another device.') if self.parent.question(msg): def task(): coro = self.lnworker.force_close_channel(channel_id) return self.network.run_from_another_thread(coro) WaitingDialog(self, 'please wait..', task, self.on_success, self.on_failure) def remove_channel(self, channel_id): if self.main_window.question(_('Are you sure you want to delete this channel? This will purge associated transactions from your wallet history.')): self.lnworker.remove_channel(channel_id) def remove_channel_backup(self, channel_id): if self.main_window.question(_('Remove channel backup?')): self.lnbackups.remove_channel_backup(channel_id) def export_channel_backup(self, channel_id): msg = ' '.join([ _("Channel backups can be imported in another instance of the same wallet, by scanning this QR code."), _("Please note that channel backups cannot be used to restore your channels."), _("If you lose your wallet file, the only thing you can do with a backup is to request your channel to be closed, so that your funds will be sent on-chain."), ]) data = self.lnworker.export_channel_backup(channel_id) self.main_window.show_qrcode(data, 'channel backup', help_text=msg, show_copy_text_btn=True) def request_force_close(self, channel_id): def task(): coro = self.lnbackups.request_force_close(channel_id) return self.network.run_from_another_thread(coro) def on_success(b): self.main_window.show_message('success') WaitingDialog(self, 'please wait..', task, on_success, self.on_failure) def create_menu(self, position): menu = QMenu() menu.setSeparatorsCollapsible(True) # consecutive separators are merged together selected = self.selected_in_column(self.Columns.NODE_ALIAS) if not selected: menu.addAction(_("Import channel backup"), lambda: self.parent.do_process_from_text_channel_backup()) menu.exec_(self.viewport().mapToGlobal(position)) return multi_select = len(selected) > 1 if multi_select: return idx = self.indexAt(position) if not idx.isValid(): return item = self.model().itemFromIndex(idx) if not item: return channel_id = idx.sibling(idx.row(), self.Columns.NODE_ALIAS).data(ROLE_CHANNEL_ID) if channel_id in self.lnbackups.channel_backups: menu.addAction(_("Request force-close"), lambda: self.request_force_close(channel_id)) menu.addAction(_("Delete"), lambda: self.remove_channel_backup(channel_id)) menu.exec_(self.viewport().mapToGlobal(position)) return chan = self.lnworker.channels[channel_id] menu.addAction(_("Details..."), lambda: self.parent.show_channel(channel_id)) cc = self.add_copy_menu(menu, idx) cc.addAction(_("Node ID"), lambda: self.place_text_on_clipboard( chan.node_id.hex(), title=_("Node ID"))) cc.addAction(_("Long Channel ID"), lambda: self.place_text_on_clipboard( channel_id.hex(), title=_("Long Channel ID"))) if not chan.is_closed(): if not chan.is_frozen_for_sending(): menu.addAction(_("Freeze (for sending)"), lambda: chan.set_frozen_for_sending(True)) else: menu.addAction(_("Unfreeze (for sending)"), lambda: chan.set_frozen_for_sending(False)) if not chan.is_frozen_for_receiving(): menu.addAction(_("Freeze (for receiving)"), lambda: chan.set_frozen_for_receiving(True)) else: menu.addAction(_("Unfreeze (for receiving)"), lambda: chan.set_frozen_for_receiving(False)) funding_tx = self.parent.wallet.db.get_transaction(chan.funding_outpoint.txid) if funding_tx: menu.addAction(_("View funding transaction"), lambda: self.parent.show_transaction(funding_tx)) if not chan.is_closed(): menu.addSeparator() if chan.peer_state == PeerState.GOOD: menu.addAction(_("Close channel"), lambda: self.close_channel(channel_id)) menu.addAction(_("Force-close channel"), lambda: self.force_close(channel_id)) else: item = chan.get_closing_height() if item: txid, height, timestamp = item closing_tx = self.lnworker.lnwatcher.db.get_transaction(txid) if closing_tx: menu.addAction(_("View closing transaction"), lambda: self.parent.show_transaction(closing_tx)) menu.addSeparator() menu.addAction(_("Export backup"), lambda: self.export_channel_backup(channel_id)) if chan.is_redeemed(): menu.addSeparator() menu.addAction(_("Delete"), lambda: self.remove_channel(channel_id)) menu.exec_(self.viewport().mapToGlobal(position)) @QtCore.pyqtSlot(Abstract_Wallet, AbstractChannel) def do_update_single_row(self, wallet: Abstract_Wallet, chan: AbstractChannel): if wallet != self.parent.wallet: return for row in range(self.model().rowCount()): item = self.model().item(row, self.Columns.NODE_ALIAS) if item.data(ROLE_CHANNEL_ID) != chan.channel_id: continue for column, v in enumerate(self.format_fields(chan)): self.model().item(row, column).setData(v, QtCore.Qt.DisplayRole) items = [self.model().item(row, column) for column in self.Columns] self._update_chan_frozen_bg(chan=chan, items=items) if wallet.lnworker: self.update_can_send(wallet.lnworker) @QtCore.pyqtSlot() def on_gossip_db(self): self.do_update_rows(self.parent.wallet) @QtCore.pyqtSlot(Abstract_Wallet) def do_update_rows(self, wallet): if wallet != self.parent.wallet: return channels = list(wallet.lnworker.channels.values()) if wallet.lnworker else [] backups = list(wallet.lnbackups.channel_backups.values()) if wallet.lnworker: self.update_can_send(wallet.lnworker) self.model().clear() self.update_headers(self.headers) for chan in channels + backups: items = [QtGui.QStandardItem(x) for x in self.format_fields(chan)] self.set_editability(items) if self._default_item_bg_brush is None: self._default_item_bg_brush = items[self.Columns.NODE_ALIAS].background() items[self.Columns.NODE_ALIAS].setData(chan.channel_id, ROLE_CHANNEL_ID) items[self.Columns.NODE_ALIAS].setFont(QFont(MONOSPACE_FONT)) items[self.Columns.LOCAL_BALANCE].setFont(QFont(MONOSPACE_FONT)) items[self.Columns.REMOTE_BALANCE].setFont(QFont(MONOSPACE_FONT)) self._update_chan_frozen_bg(chan=chan, items=items) self.model().insertRow(0, items) self.sortByColumn(self.Columns.SHORT_CHANID, Qt.DescendingOrder) def _update_chan_frozen_bg(self, *, chan: AbstractChannel, items: Sequence[QStandardItem]): assert self._default_item_bg_brush is not None # frozen for sending item = items[self.Columns.LOCAL_BALANCE] if chan.is_frozen_for_sending(): item.setBackground(ColorScheme.BLUE.as_color(True)) item.setToolTip(_("This channel is frozen for sending. It will not be used for outgoing payments.")) else: item.setBackground(self._default_item_bg_brush) item.setToolTip("") # frozen for receiving item = items[self.Columns.REMOTE_BALANCE] if chan.is_frozen_for_receiving(): item.setBackground(ColorScheme.BLUE.as_color(True)) item.setToolTip(_("This channel is frozen for receiving. It will not be included in invoices.")) else: item.setBackground(self._default_item_bg_brush) item.setToolTip("") def update_can_send(self, lnworker: LNWallet): msg = _('Can send') + ' ' + self.parent.format_amount(lnworker.num_sats_can_send())\ + ' ' + self.parent.base_unit() + '; '\ + _('can receive') + ' ' + self.parent.format_amount(lnworker.num_sats_can_receive())\ + ' ' + self.parent.base_unit() self.can_send_label.setText(msg) def get_toolbar(self): h = QHBoxLayout() self.can_send_label = QLabel('') h.addWidget(self.can_send_label) h.addStretch() self.swap_button = EnterButton(_('Swap'), self.swap_dialog) self.swap_button.setEnabled(self.parent.wallet.has_lightning()) self.new_channel_button = EnterButton(_('Open Channel'), self.new_channel_dialog) self.new_channel_button.setEnabled(self.parent.wallet.has_lightning()) h.addWidget(self.new_channel_button) h.addWidget(self.swap_button) return h def statistics_dialog(self): channel_db = self.parent.network.channel_db capacity = self.parent.format_amount(channel_db.capacity()) + ' '+ self.parent.base_unit() d = WindowModalDialog(self.parent, _('Lightning Network Statistics')) d.setMinimumWidth(400) vbox = QVBoxLayout(d) h = QGridLayout() h.addWidget(QLabel(_('Nodes') + ':'), 0, 0) h.addWidget(QLabel('{}'.format(channel_db.num_nodes)), 0, 1) h.addWidget(QLabel(_('Channels') + ':'), 1, 0) h.addWidget(QLabel('{}'.format(channel_db.num_channels)), 1, 1) h.addWidget(QLabel(_('Capacity') + ':'), 2, 0) h.addWidget(QLabel(capacity), 2, 1) vbox.addLayout(h) vbox.addLayout(Buttons(OkButton(d))) d.exec_() def new_channel_dialog(self): lnworker = self.parent.wallet.lnworker d = WindowModalDialog(self.parent, _('Open Channel')) vbox = QVBoxLayout(d) vbox.addWidget(QLabel(_('Enter Remote Node ID or connection string or invoice'))) local_nodeid = FreezableLineEdit() local_nodeid.setMinimumWidth(700) local_nodeid.setText(bh2u(lnworker.node_keypair.pubkey)) local_nodeid.setFrozen(True) local_nodeid.setCursorPosition(0) remote_nodeid = QLineEdit() remote_nodeid.setMinimumWidth(700) amount_e = BTCAmountEdit(self.parent.get_decimal_point) # max button def spend_max(): amount_e.setFrozen(max_button.isChecked()) if not max_button.isChecked(): return make_tx = self.parent.mktx_for_open_channel('!') try: tx = make_tx(None) except (NotEnoughFunds, NoDynamicFeeEstimates) as e: max_button.setChecked(False) amount_e.setFrozen(False) self.main_window.show_error(str(e)) return amount = tx.output_value() amount = min(amount, LN_MAX_FUNDING_SAT) amount_e.setAmount(amount) max_button = EnterButton(_("Max"), spend_max) max_button.setFixedWidth(100) max_button.setCheckable(True) suggest_button = QPushButton(d, text=_('Suggest')) def on_suggest(): remote_nodeid.setText(bh2u(lnworker.suggest_peer() or b'')) remote_nodeid.repaint() # macOS hack for #6269 suggest_button.clicked.connect(on_suggest) clear_button = QPushButton(d, text=_('Clear')) def on_clear(): amount_e.setText('') amount_e.setFrozen(False) amount_e.repaint() # macOS hack for #6269 remote_nodeid.setText('') remote_nodeid.repaint() # macOS hack for #6269 max_button.setChecked(False) max_button.repaint() # macOS hack for #6269 clear_button.clicked.connect(on_clear) h = QGridLayout() h.addWidget(QLabel(_('Your Node ID')), 0, 0) h.addWidget(local_nodeid, 0, 1, 1, 3) h.addWidget(QLabel(_('Remote Node ID')), 1, 0) h.addWidget(remote_nodeid, 1, 1, 1, 3) h.addWidget(suggest_button, 2, 1) h.addWidget(clear_button, 2, 2) h.addWidget(QLabel('Amount'), 3, 0) h.addWidget(amount_e, 3, 1) h.addWidget(max_button, 3, 2) vbox.addLayout(h) ok_button = OkButton(d) ok_button.setDefault(True) vbox.addLayout(Buttons(CancelButton(d), ok_button)) if not d.exec_(): return if max_button.isChecked() and amount_e.get_amount() < LN_MAX_FUNDING_SAT: # if 'max' enabled and amount is strictly less than max allowed, # that means we have fewer coins than max allowed, and hence we can # spend all coins funding_sat = '!' else: funding_sat = amount_e.get_amount() connect_str = str(remote_nodeid.text()).strip() if not connect_str or not funding_sat: return self.parent.open_channel(connect_str, funding_sat, 0) def swap_dialog(self): from .swap_dialog import SwapDialog d = SwapDialog(self.parent) d.run()