Allow wallets to use non-deterministic lightning,

if they use a software keystore.

This excludes hardware wallets and watching-only wallet.
Also, this forbids creation of new channels in those wallets,
in case lightning was previously enabled.

Fixes #9440

electrum/commands.py

@@ -1245,6 +1245,8 @@ class Commands(Logger):
 
     @command('wpnl')
     async def open_channel(self, connection_string, amount, push_amount=0, public=False, zeroconf=False, password=None, wallet: Abstract_Wallet = None):
+        if not wallet.can_have_lightning():
+            raise UserFacingException("This wallet cannot create new channels")
         funding_sat = satoshis(amount)
         push_sat = satoshis(push_amount)
         peer = await wallet.lnworker.add_peer(connection_string)

electrum/gui/qml/components/Channels.qml

@@ -134,7 +134,7 @@ Pane {
             FlatButton {
                 Layout.fillWidth: true
                 Layout.preferredWidth: 1
-                enabled: Daemon.currentWallet.confirmedBalance.satsInt > 0
+                enabled: Daemon.currentWallet.canHaveLightning && Daemon.currentWallet.confirmedBalance.satsInt > 0
                 text: qsTr('Open Channel')
                 onClicked: {
                     if (Daemon.currentWallet.channelModel.count == 0) {

electrum/gui/qt/channels_list.py

@@ -368,7 +368,7 @@ class ChannelsList(MyTreeView):
         #     and maybe add item "main_window.init_lightning_dialog()" when applicable
         menu.setEnabled(self.wallet.has_lightning())
         self.new_channel_button = EnterButton(_('New Channel'), self.main_window.new_channel_dialog)
-        self.new_channel_button.setEnabled(self.wallet.has_lightning())
+        self.new_channel_button.setEnabled(self.wallet.can_have_lightning())
         toolbar.insertWidget(2, self.new_channel_button)
         return toolbar
 

electrum/lnpeer.py

@@ -978,15 +978,20 @@ class Peer(Logger, EventListener):
 
         Channel configurations are initialized in this method.
         """
+
+        if public and not self.lnworker.config.EXPERIMENTAL_LN_FORWARD_PAYMENTS:
+            raise Exception('Cannot create public channels')
+
+        if not self.lnworker.wallet.can_have_lightning():
+            # old wallet that cannot have lightning anymore
+            raise Exception('This wallet cannot create new channels')
+
         # will raise if init fails
         await util.wait_for2(self.initialized, LN_P2P_NETWORK_TIMEOUT)
         # trampoline is not yet in features
         if self.lnworker.uses_trampoline() and not self.lnworker.is_trampoline_peer(self.pubkey):
             raise Exception('Not a trampoline node: ' + str(self.their_features))
 
-        if public and not self.lnworker.config.EXPERIMENTAL_LN_FORWARD_PAYMENTS:
-            raise Exception('Cannot create public channels')
-
         channel_flags = CF_ANNOUNCE_CHANNEL if public else 0
         feerate = self.lnworker.current_target_feerate_per_kw()
         # we set a channel type for internal bookkeeping
@@ -1251,6 +1256,10 @@ class Peer(Logger, EventListener):
             # FIXME: we might want to keep the connection open
             raise Exception('not accepting channels')
 
+        if not self.lnworker.wallet.can_have_lightning():
+            # old wallet that cannot have lightning anymore
+            raise Exception('This wallet does not accept new channels')
+
         funding_sat = payload['funding_satoshis']
         push_msat = payload['push_msat']
         feerate = payload['feerate_per_kw']  # note: we are not validating this

electrum/wallet.py

@@ -520,17 +520,21 @@ class Abstract_Wallet(ABC, Logger, EventListener):
         return self.config.ENABLE_ANCHOR_CHANNELS and self.has_channels()
 
     def can_have_lightning(self) -> bool:
-        if self.config.ENABLE_ANCHOR_CHANNELS:
-            # this excludes hardware wallets, watching-only wallets
-            return self.can_have_deterministic_lightning()
-        else:
-            # we want static_remotekey to be a wallet address
-            return self.txin_type == 'p2wpkh'
-
-    def can_have_deterministic_lightning(self) -> bool:
+        """ whether this wallet can create new channels """
+        # we want static_remotekey to be a wallet address
         if not self.txin_type == 'p2wpkh':
             return False
-        if not self.keystore:
+        if self.config.ENABLE_ANCHOR_CHANNELS:
+            # exclude watching-only wallets
+            if not self.keystore:
+                return False
+            # exclude hardware wallets
+            if not self.keystore.may_have_password():
+                return False
+        return True
+
+    def can_have_deterministic_lightning(self) -> bool:
+        if not self.can_have_lightning():
             return False
         return self.keystore.can_have_deterministic_lightning_xprv()