qml: add Save Backup dialog when no onchain backup, some initial work on incomplete funding TX

electrum/gui/qml/components/ChannelOpenProgressDialog.qml

@@ -25,6 +25,7 @@ ElDialog {
 
     property alias state: s.state
     property alias error: errorText.text
+    property alias info: infoText.text
     property alias peer: peerText.text
 
     function reset() {
@@ -110,7 +111,6 @@ ElDialog {
             InfoTextArea {
                 id: infoText
                 visible: false
-                text: qsTr('Channel will be open after 3 confirmations')
                 width: parent.width
             }
         }

electrum/gui/qml/components/OpenChannel.qml

@@ -197,11 +197,28 @@ Pane {
             app.channelOpenProgressDialog.error = message
         }
         onChannelOpenSuccess: {
-            var message = 'success!'
-            if (!has_backup)
-                message = message + ' (but no backup. TODO: show QR)'
+            var message = qsTr('Channel established.') + ' '
+                    + qsTr('This channel will be usable after %1 confirmations').arg(min_depth)
+            if (!tx_complete) {
+                message = message + ' ' + qsTr('Please sign and broadcast the funding transaction.')
+            }
             app.channelOpenProgressDialog.state = 'success'
-            app.channelOpenProgressDialog.error = message
+            app.channelOpenProgressDialog.info = message
+            if (!has_onchain_backup) {
+                app.channelOpenProgressDialog.closed.connect(function() {
+                    var dialog = app.genericShareDialog.createObject(app,
+                        {
+                            title: qsTr('Save Backup')
+                            text: channelopener.channelBackup(cid),
+                            text_help: qsTr('The channel you created is not recoverable from seed.')
+                            + ' ' + qsTr('To prevent fund losses, please save this backup on another device.')
+                            + ' ' + qsTr('It may be imported in another Electrum wallet with the same seed.')
+                        }
+                    )
+                    dialog.open()
+                })
+            }
+            // TODO: handle incomplete TX
             channelopener.wallet.channelModel.new_channel(cid)
             app.stack.pop()
         }

electrum/gui/qml/qechannelopener.py

@@ -6,6 +6,7 @@ from PyQt5.QtCore import pyqtProperty, pyqtSignal, pyqtSlot, QObject
 
 from electrum.i18n import _
 from electrum.gui import messages
+from electrum.util import bfh
 from electrum.lnutil import extract_nodeid, LNPeerAddr, ln_dummy_address
 from electrum.lnworker import hardcoded_trampoline_nodes
 from electrum.logging import get_logger
@@ -27,12 +28,13 @@ class QEChannelOpener(QObject, AuthMixin):
     _amount = QEAmount()
     _valid = False
     _opentx = None
+    _txdetails = None
 
     validationError = pyqtSignal([str,str], arguments=['code','message'])
     conflictingBackup = pyqtSignal([str], arguments=['message'])
     channelOpening = pyqtSignal([str], arguments=['peer'])
     channelOpenError = pyqtSignal([str], arguments=['message'])
-    channelOpenSuccess = pyqtSignal([str,bool], arguments=['cid','has_backup'])
+    channelOpenSuccess = pyqtSignal([str,bool,int], arguments=['cid','has_onchain_backup','min_depth','tx_complete'])
 
     dataChanged = pyqtSignal() # generic notify signal
 
@@ -82,6 +84,11 @@ class QEChannelOpener(QObject, AuthMixin):
     def finalizer(self):
         return self._finalizer
 
+    txDetailsChanged = pyqtSignal()
+    @pyqtProperty(QETxDetails, notify=txDetailsChanged)
+    def txDetails(self):
+        return self._txdetails
+
     @pyqtProperty(list, notify=dataChanged)
     def trampolineNodeNames(self):
         return list(hardcoded_trampoline_nodes().keys())
@@ -180,7 +187,16 @@ class QEChannelOpener(QObject, AuthMixin):
                     push_amt_sat=0,
                     password=password)
                 self._logger.debug('opening channel succeeded')
-                self.channelOpenSuccess.emit(chan.channel_id.hex(), chan.has_onchain_backup())
+                self.channelOpenSuccess.emit(chan.channel_id.hex(), chan.has_onchain_backup(),
+                                             chan.constraints.funding_txn_minimum_depth, funding_tx.is_complete())
+
+                # TODO: handle incomplete TX
+                #if not funding_tx.is_complete():
+                    #self._txdetails = QETxDetails(self)
+                    #self._txdetails.rawTx = funding_tx
+                    #self._txdetails.wallet = self._wallet
+                    #self.txDetailsChanged.emit()
+
             except (CancelledError,TimeoutError):
                 error = _('Could not connect to channel peer')
             except Exception as e:
@@ -212,3 +228,22 @@ class QEChannelOpener(QObject, AuthMixin):
                 #close_button_text=_('OK'),
                 #on_close=lambda: self.maybe_show_funding_tx(chan, funding_tx))
             #popup.open()
+
+
+    #def maybe_show_funding_tx(self, chan, funding_tx):
+        #n = chan.constraints.funding_txn_minimum_depth
+        #message = '\n'.join([
+            #_('Channel established.'),
+            #_('Remote peer ID') + ':' + chan.node_id.hex(),
+            #_('This channel will be usable after {} confirmations').format(n)
+        #])
+        #if not funding_tx.is_complete():
+            #message += '\n\n' + _('Please sign and broadcast the funding transaction')
+        #self.app.show_info(message)
+
+        #if not funding_tx.is_complete():
+            #self.app.tx_dialog(funding_tx)
+
+    @pyqtSlot(str, result=str)
+    def channelBackup(self, cid):
+        return self._wallet.wallet.lnworker.export_channel_backup(bfh(cid))