fix transaction parsing from command line

gui/qt/main_window.py

@@ -2244,21 +2244,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
 
 
     def tx_from_text(self, txt):
-        "json or raw hexadecimal"
-        txt = txt.strip()
+        from electrum.transaction import tx_from_str
         try:
-            txt.decode('hex')
-            is_hex = True
-        except:
-            is_hex = False
-
-        try:
-            if is_hex:
-                return Transaction(txt)
-            tx_dict = json.loads(str(txt))
-            assert "hex" in tx_dict.keys()
-            tx = Transaction(tx_dict["hex"])
-            return tx
+            return tx_from_str(txt)
         except:
             traceback.print_exc(file=sys.stdout)
             self.show_critical(_("Electrum was unable to parse your transaction"))

lib/commands.py

@@ -216,24 +216,22 @@ class Commands:
     @command('wp')
     def signtransaction(self, tx, privkey=None):
         """Sign a transaction. The wallet keys will be used unless a private key is provided."""
-        t = Transaction(tx)
         if privkey:
             pubkey = bitcoin.public_key_from_private_key(privkey)
-            t.sign({pubkey:privkey})
+            tx.sign({pubkey:privkey})
         else:
-            self.wallet.sign_transaction(t, self._password)
-        return t.as_dict()
+            self.wallet.sign_transaction(tx, self._password)
+        return tx.as_dict()
 
     @command('')
     def deserialize(self, tx):
         """Deserialize a serialized transaction"""
-        return Transaction(tx).deserialize()
+        return tx.deserialize()
 
     @command('n')
     def broadcast(self, tx, timeout=10):
         """Broadcast a transaction to the network. """
-        t = Transaction(tx)
-        return self.network.broadcast(t, timeout)
+        return self.network.broadcast(tx, timeout)
 
     @command('')
     def createmultisig(self, num, pubkeys):
@@ -667,12 +665,13 @@ command_options = {
 
 
 # don't use floats because of rounding errors
+from transaction import tx_from_str
 json_loads = lambda x: json.loads(x, parse_float=lambda x: str(Decimal(x)))
 arg_types = {
     'num': int,
     'nbits': int,
     'entropy': long,
-    'tx': json_loads,
+    'tx': tx_from_str,
     'pubkeys': json_loads,
     'inputs': json_loads,
     'outputs': json_loads,

lib/transaction.py

@@ -859,3 +859,21 @@ class Transaction:
         print_error(priority, threshold)
 
         return priority < threshold
+
+
+
+def tx_from_str(txt):
+    "json or raw hexadecimal"
+    import json
+    txt = txt.strip()
+    try:
+        txt.decode('hex')
+        is_hex = True
+    except:
+        is_hex = False
+    if is_hex:
+        return Transaction(txt)
+    tx_dict = json.loads(str(txt))
+    assert "hex" in tx_dict.keys()
+    tx = Transaction(tx_dict["hex"])
+    return tx