local tx: restructure exception handling wrt wallet.add_transaction and QT

gui/qt/history_list.py

@@ -26,7 +26,7 @@
 import webbrowser
 import datetime
 
-from electrum.wallet import UnrelatedTransactionException, TX_HEIGHT_LOCAL
+from electrum.wallet import AddTransactionException, TX_HEIGHT_LOCAL
 from .util import *
 from electrum.i18n import _
 from electrum.util import block_explorer_URL
@@ -356,16 +356,12 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
         self.parent.need_update.set()
 
     def onFileAdded(self, fn):
-        with open(fn) as f:
-            tx = self.parent.tx_from_text(f.read())
-            try:
-                self.wallet.add_transaction(tx.txid(), tx)
-            except UnrelatedTransactionException as e:
-                self.parent.show_error(e)
-            else:
-                self.wallet.save_transactions(write=True)
-                # need to update at least: history_list, utxo_list, address_list
-                self.parent.need_update.set()
+        try:
+            with open(fn) as f:
+                tx = self.parent.tx_from_text(f.read())
+                self.parent.save_transaction_into_wallet(tx)
+        except IOError as e:
+            self.parent.show_error(e)
 
     def export_history_dialog(self):
         d = WindowModalDialog(self, _('Export History'))

gui/qt/main_window.py

@@ -51,7 +51,7 @@ from electrum.util import (format_time, format_satoshis, PrintError,
 from electrum import Transaction
 from electrum import util, bitcoin, commands, coinchooser
 from electrum import paymentrequest
-from electrum.wallet import Multisig_Wallet
+from electrum.wallet import Multisig_Wallet, AddTransactionException
 
 from .amountedit import AmountEdit, BTCAmountEdit, MyLineEdit, FeerateEdit
 from .qrcodewidget import QRCodeWidget, QRDialog
@@ -3125,3 +3125,21 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         if is_final:
             new_tx.set_rbf(False)
         self.show_transaction(new_tx, tx_label)
+
+    def save_transaction_into_wallet(self, tx):
+        try:
+            if not self.wallet.add_transaction(tx.txid(), tx):
+                self.show_error(_("Transaction could not be saved.") + "\n" +
+                                       _("It conflicts with current history."))
+                return False
+        except AddTransactionException as e:
+            self.show_error(e)
+            return False
+        else:
+            self.wallet.save_transactions(write=True)
+            # need to update at least: history_list, utxo_list, address_list
+            self.need_update.set()
+            self.show_message(_("Transaction saved successfully"))
+            return True
+
+

gui/qt/transaction_dialog.py

@@ -35,7 +35,7 @@ from electrum.i18n import _
 from electrum.plugins import run_hook
 
 from electrum.util import bfh
-from electrum.wallet import UnrelatedTransactionException
+from electrum.wallet import AddTransactionException
 
 from .util import *
 
@@ -179,17 +179,9 @@ class TxDialog(QDialog, MessageBoxMixin):
         self.main_window.sign_tx(self.tx, sign_done)
 
     def save(self):
-        if not self.wallet.add_transaction(self.tx.txid(), self.tx):
-            self.show_error(_("Transaction could not be saved. It conflicts with current history."))
-            return
-        self.wallet.save_transactions(write=True)
-
-        # need to update at least: history_list, utxo_list, address_list
-        self.main_window.need_update.set()
-
-        self.save_button.setDisabled(True)
-        self.show_message(_("Transaction saved successfully"))
-        self.saved = True
+        if self.main_window.save_transaction_into_wallet(self.tx):
+            self.save_button.setDisabled(True)
+            self.saved = True
 
 
     def export(self):