fix some network.get_transaction calls

see #4814 (issuecomment-434392195)

electrum/gui/qt/main_window.py

@@ -2427,11 +2427,12 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         if ok and txid:
             txid = str(txid).strip()
             try:
-                r = self.network.get_transaction(txid)
-            except BaseException as e:
-                self.show_message(str(e))
+                raw_tx = self.network.run_from_another_thread(
+                    self.network.get_transaction(txid, timeout=10))
+            except Exception as e:
+                self.show_message(_("Error getting transaction from network") + ":\n" + str(e))
                 return
-            tx = transaction.Transaction(r)
+            tx = transaction.Transaction(raw_tx)
             self.show_transaction(tx)
 
     @protected

electrum/interface.py

@@ -68,9 +68,9 @@ class NotificationSession(RPCSession):
             else:
                 raise Exception('unexpected request: {}'.format(repr(request)))
 
-    async def send_request(self, *args, timeout=-1, **kwargs):
+    async def send_request(self, *args, timeout=None, **kwargs):
         # note: the timeout starts after the request touches the wire!
-        if timeout == -1:
+        if timeout is None:
             timeout = 30
         # note: the semaphore implementation guarantees no starvation
         async with self.in_flight_requests_semaphore:
@@ -108,7 +108,13 @@ class NotificationSession(RPCSession):
 
 
 class GracefulDisconnect(Exception): pass
-class RequestTimedOut(GracefulDisconnect): pass
+
+
+class RequestTimedOut(GracefulDisconnect):
+    def __str__(self):
+        return _("Network request timed out.")
+
+
 class ErrorParsingSSLCert(Exception): pass
 class ErrorGettingSSLCertFromServer(Exception): pass
 

electrum/network.py

@@ -706,7 +706,7 @@ class Network(PrintError):
         return await self.interface.session.send_request('blockchain.transaction.get_merkle', [tx_hash, tx_height])
 
     @best_effort_reliable
-    async def broadcast_transaction(self, tx, timeout=10):
+    async def broadcast_transaction(self, tx, *, timeout=10):
         out = await self.interface.session.send_request('blockchain.transaction.broadcast', [str(tx)], timeout=timeout)
         if out != tx.txid():
             raise Exception(out)
@@ -717,8 +717,9 @@ class Network(PrintError):
         return await self.interface.request_chunk(height, tip=tip, can_return_early=can_return_early)
 
     @best_effort_reliable
-    async def get_transaction(self, tx_hash: str) -> str:
-        return await self.interface.session.send_request('blockchain.transaction.get', [tx_hash])
+    async def get_transaction(self, tx_hash: str, *, timeout=None) -> str:
+        return await self.interface.session.send_request('blockchain.transaction.get', [tx_hash],
+                                                         timeout=timeout)
 
     @best_effort_reliable
     async def get_history_for_scripthash(self, sh: str) -> List[dict]:

electrum/util.py

@@ -113,16 +113,6 @@ class FileExportFailed(Exception):
         return _("Failed to export to file.") + "\n" + self.message
 
 
-class TimeoutException(Exception):
-    def __init__(self, message=''):
-        self.message = str(message)
-
-    def __str__(self):
-        if not self.message:
-            return _("Operation timed out.")
-        return self.message
-
-
 class WalletFileException(Exception): pass
 
 

electrum/wallet.py

@@ -43,7 +43,7 @@ from typing import TYPE_CHECKING, List, Optional, Tuple
 from .i18n import _
 from .util import (NotEnoughFunds, PrintError, UserCancelled, profiler,
                    format_satoshis, format_fee_satoshis, NoDynamicFeeEstimates,
-                   TimeoutException, WalletFileException, BitcoinException,
+                   WalletFileException, BitcoinException,
                    InvalidPassword, format_time, timestamp_to_datetime, Satoshis,
                    Fiat, bfh, bh2u)
 from .bitcoin import (COIN, TYPE_ADDRESS, is_address, address_to_script,
@@ -60,6 +60,7 @@ from .address_synchronizer import (AddressSynchronizer, TX_HEIGHT_LOCAL,
 from .paymentrequest import (PR_PAID, PR_UNPAID, PR_UNKNOWN, PR_EXPIRED,
                              InvoiceStore)
 from .contacts import Contacts
+from .interface import RequestTimedOut
 
 if TYPE_CHECKING:
     from .network import Network
@@ -768,11 +769,14 @@ class Abstract_Wallet(AddressSynchronizer):
         tx = self.transactions.get(tx_hash, None)
         if not tx and self.network:
             try:
-                tx = Transaction(self.network.get_transaction(tx_hash))
-            except TimeoutException as e:
-                self.print_error('getting input txn from network timed out for {}'.format(tx_hash))
+                raw_tx = self.network.run_from_another_thread(
+                    self.network.get_transaction(tx_hash, timeout=10))
+            except RequestTimedOut as e:
+                self.print_error(f'getting input txn from network timed out for {tx_hash}')
                 if not ignore_timeout:
                     raise e
+            else:
+                tx = Transaction(raw_tx)
         return tx
 
     def add_hw_info(self, tx):