bip39 scan: follow-up prev

- use logger
- allow qt dialog to be GC-ed
- (trivial) add typing; minor formatting

electrum/base_wizard.py

@@ -404,7 +404,7 @@ class BaseWizard(Logger):
         else:
             raise Exception('unknown purpose: %s' % purpose)
 
-    def derivation_and_script_type_dialog(self, f, get_account_xpub=None):
+    def derivation_and_script_type_dialog(self, f, *, get_account_xpub=None):
         message1 = _('Choose the type of addresses in your wallet.')
         message2 = ' '.join([
             _('You can override the suggested derivation path.'),
@@ -516,7 +516,7 @@ class BaseWizard(Logger):
             account_node = root_node.subkey_at_private_derivation(account_path)
             account_xpub = account_node.to_xpub()
             return account_xpub
-        self.derivation_and_script_type_dialog(f, get_account_xpub)
+        self.derivation_and_script_type_dialog(f, get_account_xpub=get_account_xpub)
 
     def create_keystore(self, seed, passphrase):
         k = keystore.from_seed(seed, passphrase, self.wallet_type == 'multisig')

electrum/bip39_recovery.py

@@ -2,6 +2,8 @@
 # Distributed under the MIT software license, see the accompanying
 # file LICENCE or http://www.opensource.org/licenses/mit-license.php
 
+from typing import TYPE_CHECKING
+
 from aiorpcx import TaskGroup
 
 from . import bitcoin
@@ -10,7 +12,11 @@ from .bip32 import BIP32_PRIME, BIP32Node
 from .bip32 import convert_bip32_path_to_list_of_uint32 as bip32_str_to_ints
 from .bip32 import convert_bip32_intpath_to_strpath as bip32_ints_to_str
 
-async def account_discovery(network, get_account_xpub):
+if TYPE_CHECKING:
+    from .network import Network
+
+
+async def account_discovery(network: 'Network', get_account_xpub):
     async with TaskGroup() as group:
         account_scan_tasks = []
         for wallet_format in BIP39_WALLET_FORMATS:
@@ -21,13 +27,14 @@ async def account_discovery(network, get_account_xpub):
         active_accounts.extend(task.result())
     return active_accounts
 
-async def scan_for_active_accounts(network, get_account_xpub, wallet_format):
+
+async def scan_for_active_accounts(network: 'Network', get_account_xpub, wallet_format):
     active_accounts = []
     account_path = bip32_str_to_ints(wallet_format["derivation_path"])
     while True:
         account_xpub = get_account_xpub(account_path)
         account_node = BIP32Node.from_xkey(account_xpub)
-        has_history = await account_has_history(network, account_node, wallet_format["script_type"]);
+        has_history = await account_has_history(network, account_node, wallet_format["script_type"])
         if has_history:
             account = format_account(wallet_format, account_path)
             active_accounts.append(account)
@@ -36,7 +43,8 @@ async def scan_for_active_accounts(network, get_account_xpub, wallet_format):
         account_path[-1] = account_path[-1] + 1
     return active_accounts
 
-async def account_has_history(network, account_node, script_type):
+
+async def account_has_history(network: 'Network', account_node: BIP32Node, script_type: str) -> bool:
     gap_limit = 20
     async with TaskGroup() as group:
         get_history_tasks = []
@@ -54,6 +62,7 @@ async def account_has_history(network, account_node, script_type):
             return True
     return False
 
+
 def format_account(wallet_format, account_path):
     description = wallet_format["description"]
     if wallet_format["iterate_accounts"]:

electrum/gui/qt/bip39_recovery_dialog.py

@@ -8,9 +8,14 @@ from PyQt5.QtWidgets import QWidget, QVBoxLayout, QGridLayout, QLabel, QListWidg
 from electrum.i18n import _
 from electrum.network import Network
 from electrum.bip39_recovery import account_discovery
+from electrum.logging import get_logger
 
 from .util import WindowModalDialog, MessageBoxMixin, TaskThread, Buttons, CancelButton, OkButton
 
+
+_logger = get_logger(__name__)
+
+
 class Bip39RecoveryDialog(WindowModalDialog):
     def __init__(self, parent: QWidget, get_account_xpub, on_account_select):
         self.get_account_xpub = get_account_xpub
@@ -25,11 +30,15 @@ class Bip39RecoveryDialog(WindowModalDialog):
         self.ok_button.clicked.connect(self.on_ok_button_click)
         self.ok_button.setEnabled(False)
         vbox.addLayout(Buttons(CancelButton(self), self.ok_button))
+        self.finished.connect(self.on_finished)
         self.show()
         self.thread = TaskThread(self)
         self.thread.finished.connect(self.deleteLater) # see #3956
         self.thread.add(self.recovery, self.on_recovery_success, None, self.on_recovery_error)
 
+    def on_finished(self):
+        self.thread.stop()
+
     def on_ok_button_click(self):
         item = self.list.currentItem()
         account = item.data(Qt.UserRole)
@@ -54,10 +63,10 @@ class Bip39RecoveryDialog(WindowModalDialog):
         self.list.clicked.connect(lambda: self.ok_button.setEnabled(True))
         self.content.addWidget(self.list)
 
-    def on_recovery_error(self, error):
+    def on_recovery_error(self, exc_info):
         self.clear_content()
         self.content.addWidget(QLabel(_('Error: Account discovery failed.')))
-        print(error)
+        _logger.error(f"recovery error", exc_info=exc_info)
 
     def clear_content(self):
         for i in reversed(range(self.content.count())):

electrum/gui/qt/installwizard.py

@@ -604,9 +604,18 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
         return clayout.selected_index()
 
     @wizard_dialog
-    def derivation_and_script_type_gui_specific_dialog(self, title: str, message1: str, choices: List[Tuple[str, str, str]],
-                               message2: str, test_text: Callable[[str], int],
-                               run_next, default_choice_idx: int=0, get_account_xpub=None) -> Tuple[str, str]:
+    def derivation_and_script_type_gui_specific_dialog(
+            self,
+            *,
+            title: str,
+            message1: str,
+            choices: List[Tuple[str, str, str]],
+            message2: str,
+            test_text: Callable[[str], int],
+            run_next,
+            default_choice_idx: int = 0,
+            get_account_xpub=None
+    ) -> Tuple[str, str]:
         vbox = QVBoxLayout()
 
         if get_account_xpub: