better handle exceptions in wizard re "cannot connect to trustedcoin server"

gui/kivy/main_window.py

@@ -485,7 +485,7 @@ class ElectrumWindow(App):
         else:
             return ''
 
-    def on_wizard_complete(self, instance, wallet):
+    def on_wizard_complete(self, wizard, wallet):
         if wallet:  # wizard returned a wallet
             wallet.start_threads(self.daemon.network)
             self.daemon.add_wallet(wallet)
@@ -493,9 +493,9 @@ class ElectrumWindow(App):
         elif not self.wallet:
             # wizard did not return a wallet; and there is no wallet open atm
             # try to open last saved wallet (potentially start wizard again)
-            self.load_wallet_by_name(self.electrum_config.get_wallet_path())
+            self.load_wallet_by_name(self.electrum_config.get_wallet_path(), ask_if_wizard=True)
 
-    def load_wallet_by_name(self, path):
+    def load_wallet_by_name(self, path, ask_if_wizard=False):
         if not path:
             return
         if self.wallet and self.wallet.storage.path == path:
@@ -508,11 +508,27 @@ class ElectrumWindow(App):
                 self.load_wallet(wallet)
         else:
             Logger.debug('Electrum: Wallet not found or action needed. Launching install wizard')
-            storage = WalletStorage(path, manual_upgrades=True)
-            wizard = Factory.InstallWizard(self.electrum_config, self.plugins, storage)
-            wizard.bind(on_wizard_complete=self.on_wizard_complete)
-            action = wizard.storage.get_action()
-            wizard.run(action)
+
+            def launch_wizard():
+                storage = WalletStorage(path, manual_upgrades=True)
+                wizard = Factory.InstallWizard(self.electrum_config, self.plugins, storage)
+                wizard.bind(on_wizard_complete=self.on_wizard_complete)
+                action = wizard.storage.get_action()
+                wizard.run(action)
+            if not ask_if_wizard:
+                launch_wizard()
+            else:
+                from .uix.dialogs.question import Question
+
+                def handle_answer(b: bool):
+                    if b:
+                        launch_wizard()
+                    else:
+                        try: os.unlink(path)
+                        except FileNotFoundError: pass
+                        self.stop()
+                d = Question(_('Do you want to launch the wizard again?'), handle_answer)
+                d.open()
 
     def on_stop(self):
         Logger.info('on_stop')

gui/kivy/uix/dialogs/installwizard.py

@@ -189,6 +189,7 @@ Builder.load_string('''
 
 <WizardTOSDialog>
     message : ''
+    size_hint: 1, 1
     ScrollView:
         size_hint: 1, 1
         Label:

plugins/trustedcoin/kivy.py

@@ -32,7 +32,7 @@ from kivy.clock import Clock
 
 from electrum.i18n import _
 from electrum.plugins import hook
-from .trustedcoin import TrustedCoinPlugin, server, KIVY_DISCLAIMER, TrustedCoinException
+from .trustedcoin import TrustedCoinPlugin, server, KIVY_DISCLAIMER, TrustedCoinException, ErrorConnectingServer
 
 
 
@@ -66,21 +66,30 @@ class Plugin(TrustedCoinPlugin):
             if e.status_code == 400:  # invalid OTP
                 Clock.schedule_once(lambda dt: on_failure(_('Invalid one-time password.')))
             else:
-                Clock.schedule_once(lambda dt, bound_e=e: on_failure(_('Error') + ':' + str(bound_e)))
+                Clock.schedule_once(lambda dt, bound_e=e: on_failure(_('Error') + ':\n' + str(bound_e)))
         except Exception as e:
-            Clock.schedule_once(lambda dt, bound_e=e: on_failure(_('Error') + ':' + str(bound_e)))
+            Clock.schedule_once(lambda dt, bound_e=e: on_failure(_('Error') + ':\n' + str(bound_e)))
         else:
             on_success(tx)
 
     def accept_terms_of_use(self, wizard):
-        tos = server.get_terms_of_service()
-        f = lambda x: self.read_email(wizard)
-        wizard.tos_dialog(tos=tos, run_next = f)
+        def handle_error(msg, e):
+            wizard.show_error(msg + ':\n' + str(e))
+            wizard.terminate()
+        try:
+            tos = server.get_terms_of_service()
+        except ErrorConnectingServer as e:
+            Clock.schedule_once(lambda dt, bound_e=e: handle_error(_('Error connecting to server'), bound_e))
+        except Exception as e:
+            Clock.schedule_once(lambda dt, bound_e=e: handle_error(_('Error'), bound_e))
+        else:
+            f = lambda x: self.read_email(wizard)
+            wizard.tos_dialog(tos=tos, run_next=f)
 
     def read_email(self, wizard):
         f = lambda x: self.create_remote_key(x, wizard)
-        wizard.email_dialog(run_next = f)
+        wizard.email_dialog(run_next=f)
 
     def request_otp_dialog(self, wizard, short_id, otp_secret, xpub3):
         f = lambda otp, reset: self.check_otp(wizard, short_id, otp_secret, xpub3, otp, reset)
-        wizard.otp_dialog(otp_secret=otp_secret, run_next = f)
+        wizard.otp_dialog(otp_secret=otp_secret, run_next=f)

plugins/trustedcoin/trustedcoin.py

@@ -539,8 +539,9 @@ class TrustedCoinPlugin(BasePlugin):
         # secret must be sent by the server
         try:
             r = server.create(xpub1, xpub2, email)
-        except socket.error:
+        except (socket.error, ErrorConnectingServer):
             wizard.show_message('Server not reachable, aborting')
+            wizard.terminate()
             return
         except TrustedCoinException as e:
             if e.status_code == 409: