kivy: implement freezing channels

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

@@ -244,6 +244,8 @@ Builder.load_string(r'''
     can_receive:''
     is_open:False
     warning: ''
+    is_frozen_for_sending: False
+    is_frozen_for_receiving: False
     BoxLayout:
         padding: '12dp', '12dp', '12dp', '12dp'
         spacing: '12dp'
@@ -286,6 +288,12 @@ Builder.load_string(r'''
                 BoxLabel:
                     text: _('Fee rate')
                     value: '{} sat/byte'.format(root.feerate)
+                BoxLabel:
+                    text: _('Frozen (for sending)')
+                    value: str(root.is_frozen_for_sending)
+                BoxLabel:
+                    text: _('Frozen (for receiving)')
+                    value: str(root.is_frozen_for_receiving)
                 Widget:
                     size_hint: 1, 0.1
                 TopLabel:
@@ -474,16 +482,27 @@ class ChannelDetailsPopup(Popup, Logger):
             self.closing_txid, closing_height, closing_timestamp = closed
         msg = messages.MSG_NON_TRAMPOLINE_CHANNEL_FROZEN_WITHOUT_GOSSIP
         self.warning = '' if self.app.wallet.lnworker.channel_db or self.app.wallet.lnworker.is_trampoline_peer(chan.node_id) else _('Warning') + ': ' + msg
+        self.is_frozen_for_sending = chan.is_frozen_for_sending()
+        self.is_frozen_for_receiving = chan.is_frozen_for_receiving()
         self.update_action_dropdown()
 
     def update_action_dropdown(self):
         action_dropdown = self.ids.action_dropdown  # type: ActionDropdown
-        options = (
+        options = [
             ActionButtonOption(text=_('Backup'), func=lambda btn: self.export_backup()),
             ActionButtonOption(text=_('Close channel'), func=lambda btn: self.close(), enabled=not self.is_closed),
             ActionButtonOption(text=_('Force-close'), func=lambda btn: self.force_close(), enabled=not self.is_closed),
             ActionButtonOption(text=_('Delete'), func=lambda btn: self.remove_channel(), enabled=self.can_be_deleted),
-        )
+        ]
+        if not self.chan.is_closed():
+            if not self.chan.is_frozen_for_sending():
+                options.append(ActionButtonOption(text=_("Freeze") + "\n(for sending)", func=lambda btn: self.freeze_for_sending()))
+            else:
+                options.append(ActionButtonOption(text=_("Unfreeze") + "\n(for sending)", func=lambda btn: self.freeze_for_sending()))
+            if not self.chan.is_frozen_for_receiving():
+                options.append(ActionButtonOption(text=_("Freeze") + "\n(for receiving)", func=lambda btn: self.freeze_for_receiving()))
+            else:
+                options.append(ActionButtonOption(text=_("Unfreeze") + "\n(for receiving)", func=lambda btn: self.freeze_for_receiving()))
         action_dropdown.update(options=options)
 
     def close(self):
@@ -574,6 +593,20 @@ class ChannelDetailsPopup(Popup, Logger):
             self.logger.exception("Could not force close channel")
             self.app.show_info(_('Could not force close channel: ') + repr(e)) # repr because str(Exception()) == ''
 
+    def freeze_for_sending(self):
+        lnworker = self.chan.lnworker
+        if lnworker.channel_db or lnworker.is_trampoline_peer(self.chan.node_id):
+            self.is_frozen_for_sending = not self.is_frozen_for_sending
+            self.chan.set_frozen_for_sending(self.is_frozen_for_sending)
+            self.update_action_dropdown()
+        else:
+            self.app.show_info(messages.MSG_NON_TRAMPOLINE_CHANNEL_FROZEN_WITHOUT_GOSSIP)
+
+    def freeze_for_receiving(self):
+        self.is_frozen_for_receiving = not self.is_frozen_for_receiving
+        self.chan.set_frozen_for_receiving(self.is_frozen_for_receiving)
+        self.update_action_dropdown()
+
 
 class LightningChannelsDialog(Factory.Popup):