kivy and qt: adapt open_channel dialogs to trampoline

electrum/gui/kivy/uix/dialogs/lightning_open_channel.py

@@ -21,6 +21,7 @@ Builder.load_string('''
 #:import KIVY_GUI_PATH electrum.gui.kivy.KIVY_GUI_PATH
 
 <LightningOpenChannelDialog@Popup>
+    use_gossip: False
     id: s
     name: 'lightning_open_channel'
     title: _('Open Lightning Channel')
@@ -45,8 +46,9 @@ Builder.load_string('''
                     size: '22dp', '22dp'
                     pos_hint: {'center_y': .5}
                 BlueButton:
-                    text: s.pubkey if s.pubkey else _('Node ID')
+                    text: s.pubkey if s.pubkey else (_('Node ID') if root.use_gossip else _('Trampoline node'))
                     shorten: True
+                    on_release: s.suggest_node()
             CardSeparator:
                 color: blue_bottom.foreground_color
             BoxLayout:
@@ -61,7 +63,7 @@ Builder.load_string('''
                     text: s.amount if s.amount else _('Amount')
                     on_release: app.amount_dialog(s, True)
         TopLabel:
-            text: _('Paste or scan a node ID, a connection string or a lightning invoice.')
+            text: _('Paste or scan a node ID, a connection string or a lightning invoice.') if root.use_gossip else _('Choose a trampoline node and the amount')
         BoxLayout:
             size_hint: 1, None
             height: '48dp'
@@ -107,14 +109,19 @@ class LightningOpenChannelDialog(Factory.Popup, Logger):
         d.open()
 
     def suggest_node(self):
-        suggested = self.app.wallet.lnworker.suggest_peer()
+        if self.use_gossip:
-        if suggested:
+            suggested = self.app.wallet.lnworker.suggest_peer()
-            self.pubkey = suggested.hex()
+            if suggested:
+                self.pubkey = suggested.hex()
+            else:
+                _, _, percent = self.app.wallet.network.lngossip.get_sync_progress_estimate()
+                if percent is None:
+                    percent = "??"
+                self.pubkey = f"Please wait, graph is updating ({percent}% / 30% done)."
         else:
-            _, _, percent = self.app.wallet.network.lngossip.get_sync_progress_estimate()
+            self.trampoline_index += 1
-            if percent is None:
+            self.trampoline_index = self.trampoline_index % len(self.trampoline_names)
-                percent = "??"
+            self.pubkey = self.trampoline_names[self.trampoline_index]
-            self.pubkey = f"Please wait, graph is updating ({percent}% / 30% done)."
 
     def __init__(self, app, lnaddr=None, msg=None):
         Factory.Popup.__init__(self)
@@ -122,6 +129,13 @@ class LightningOpenChannelDialog(Factory.Popup, Logger):
         self.app = app  # type: ElectrumWindow
         self.lnaddr = lnaddr
         self.msg = msg
+        self.use_gossip = bool(self.app.network.channel_db)
+        if not self.use_gossip:
+            from electrum.lnworker import hardcoded_trampoline_nodes
+            self.trampolines = hardcoded_trampoline_nodes()
+            self.trampoline_names = list(self.trampolines.keys())
+            self.trampoline_index = 0
+            self.pubkey = ''
 
     def open(self, *args, **kwargs):
         super(LightningOpenChannelDialog, self).open(*args, **kwargs)
@@ -153,9 +167,12 @@ class LightningOpenChannelDialog(Factory.Popup, Logger):
         if not self.pubkey or not self.amount:
             self.app.show_info(_('All fields must be filled out'))
             return
-        conn_str = self.pubkey
+        if self.use_gossip:
-        if self.ipport:
+            conn_str = self.pubkey
-            conn_str += '@' + self.ipport.strip()
+            if self.ipport:
+                conn_str += '@' + self.ipport.strip()
+        else:
+            conn_str = str(self.trampolines[self.pubkey])
         amount = '!' if self.is_max else self.app.get_amount(self.amount)
         self.app.protected('Create a new channel?', self.do_open_channel, (conn_str, amount))
         self.dismiss()

electrum/gui/qt/channels_list.py

@@ -6,7 +6,7 @@ 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)
+                             QPushButton, QAbstractItemView, QComboBox)
 from PyQt5.QtGui import QFont, QStandardItem, QBrush
 
 from electrum.util import bh2u, NotEnoughFunds, NoDynamicFeeEstimates
@@ -343,9 +343,30 @@ class ChannelsList(MyTreeView):
         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')))
+        if self.parent.network.channel_db:
-        remote_nodeid = QLineEdit()
+            vbox.addWidget(QLabel(_('Enter Remote Node ID or connection string or invoice')))
-        remote_nodeid.setMinimumWidth(700)
+            remote_nodeid = QLineEdit()
+            remote_nodeid.setMinimumWidth(700)
+            suggest_button = QPushButton(d, text=_('Suggest Peer'))
+            def on_suggest():
+                self.parent.wallet.network.start_gossip()
+                nodeid = bh2u(lnworker.suggest_peer() or b'')
+                if not nodeid:
+                    remote_nodeid.setText("")
+                    remote_nodeid.setPlaceholderText(
+                        "Please wait until the graph is synchronized to 30%, and then try again.")
+                else:
+                    remote_nodeid.setText(nodeid)
+                remote_nodeid.repaint()  # macOS hack for #6269
+            suggest_button.clicked.connect(on_suggest)
+        else:
+            from electrum.lnworker import hardcoded_trampoline_nodes
+            trampolines = hardcoded_trampoline_nodes()
+            trampoline_names = list(trampolines.keys())
+            trampoline_combo = QComboBox()
+            trampoline_combo.addItems(trampoline_names)
+            trampoline_combo.setCurrentIndex(1)
+
         amount_e = BTCAmountEdit(self.parent.get_decimal_point)
         # max button
         def spend_max():
@@ -367,37 +388,31 @@ class ChannelsList(MyTreeView):
         max_button.setFixedWidth(100)
         max_button.setCheckable(True)
 
-        suggest_button = QPushButton(d, text=_('Suggest Peer'))
-        def on_suggest():
-            self.parent.wallet.network.start_gossip()
-            nodeid = bh2u(lnworker.suggest_peer() or b'')
-            if not nodeid:
-                remote_nodeid.setText("")
-                remote_nodeid.setPlaceholderText(
-                    "Please wait until the graph is synchronized to 30%, and then try again.")
-            else:
-                remote_nodeid.setText(nodeid)
-            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('')
+            if self.parent.network.channel_db:
-            remote_nodeid.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)
+        clear_button.setFixedWidth(100)
         h = QGridLayout()
-        h.addWidget(QLabel(_('Remote Node ID')), 0, 0)
+        if self.parent.network.channel_db:
-        h.addWidget(remote_nodeid, 0, 1, 1, 3)
+            h.addWidget(QLabel(_('Remote Node ID')), 0, 0)
-        h.addWidget(suggest_button, 1, 1)
+            h.addWidget(remote_nodeid, 0, 1, 1, 4)
-        h.addWidget(clear_button, 1, 2)
+            h.addWidget(suggest_button, 0, 5)
+        else:
+            h.addWidget(QLabel(_('Trampoline Node')), 0, 0)
+            h.addWidget(trampoline_combo, 0, 1, 1, 3)
+
         h.addWidget(QLabel('Amount'), 2, 0)
         h.addWidget(amount_e, 2, 1)
         h.addWidget(max_button, 2, 2)
+        h.addWidget(clear_button, 2, 3)
         vbox.addLayout(h)
         ok_button = OkButton(d)
         ok_button.setDefault(True)
@@ -411,7 +426,11 @@ class ChannelsList(MyTreeView):
             funding_sat = '!'
         else:
             funding_sat = amount_e.get_amount()
-        connect_str = str(remote_nodeid.text()).strip()
+        if self.parent.network.channel_db:
+            connect_str = str(remote_nodeid.text()).strip()
+        else:
+            name = trampoline_names[trampoline_combo.currentIndex()]
+            connect_str = str(trampolines[name])
         if not connect_str or not funding_sat:
             return
         self.parent.open_channel(connect_str, funding_sat, 0)