trezor: segwit offline signing

lib/wallet.py

@@ -44,7 +44,7 @@ import sys
 
 from .i18n import _
 from .util import (NotEnoughFunds, PrintError, UserCancelled, profiler,
-                   format_satoshis, NoDynamicFeeEstimates)
+                   format_satoshis, NoDynamicFeeEstimates, TimeoutException)
 
 from .bitcoin import *
 from .version import *
@@ -1401,21 +1401,28 @@ class Abstract_Wallet(PrintError):
                 return True
         return False
 
-    def get_input_tx(self, tx_hash):
+    def get_input_tx(self, tx_hash, ignore_timeout=False):
         # First look up an input transaction in the wallet where it
         # will likely be.  If co-signing a transaction it may not have
         # all the input txs, in which case we ask the network.
-        tx = self.transactions.get(tx_hash)
+        tx = self.transactions.get(tx_hash, None)
         if not tx and self.network:
             request = ('blockchain.transaction.get', [tx_hash])
-            tx = Transaction(self.network.synchronous_get(request))
+            try:
+                tx = Transaction(self.network.synchronous_get(request))
+            except TimeoutException as e:
+                self.print_error('getting input txn from network timed out for {}'.format(tx_hash))
+                if not ignore_timeout:
+                    raise e
         return tx
 
     def add_hw_info(self, tx):
         # add previous tx for hw wallets
         for txin in tx.inputs():
             tx_hash = txin['prevout_hash']
-            txin['prev_tx'] = self.get_input_tx(tx_hash)
+            # segwit inputs might not be needed for some hw wallets
+            ignore_timeout = Transaction.is_segwit_input(txin)
+            txin['prev_tx'] = self.get_input_tx(tx_hash, ignore_timeout)
         # add output info for hw wallets
         info = {}
         xpubs = self.get_master_public_keys()