implement MIN_RELAY_TX_FEE

gui/gui_classic.py

@@ -32,6 +32,7 @@ from PyQt4.QtCore import *
 import PyQt4.QtCore as QtCore
 import PyQt4.QtGui as QtGui
 from electrum.interface import DEFAULT_SERVERS
+from electrum.bitcoin import MIN_RELAY_TX_FEE
 
 try:
     import icons_rc
@@ -795,8 +796,8 @@ class ElectrumWindow(QMainWindow):
             self.show_message(str(e))
             return
 
-        if tx.requires_fee(self.wallet.verifier) and fee == 0:
+        if tx.requires_fee(self.wallet.verifier) and fee < MIN_RELAY_TX_FEE:
-            QMessageBox.warning(self, _('Error'), _("This transaction requires a fee, or it will not be propagated by the network."), _('OK'))
+            QMessageBox.warning(self, _('Error'), _("This transaction requires a higher fee, or it will not be propagated by the network."), _('OK'))
             return
 
         self.run_hook('send_tx', tx)

gui/gui_gtk.py

@@ -35,6 +35,7 @@ MONOSPACE_FONT = 'Lucida Console' if platform.system() == 'Windows' else 'monosp
 
 from electrum.util import format_satoshis
 from electrum.interface import DEFAULT_SERVERS
+from electrum.bitcoin import MIN_RELAY_TX_FEE
 
 def numbify(entry, is_int = False):
     text = entry.get_text().strip()
@@ -844,8 +845,8 @@ class ElectrumWindow:
             self.show_message(str(e))
             return
 
-        if tx.requires_fee(self.wallet.verifier) and fee == 0:
+        if tx.requires_fee(self.wallet.verifier) and fee < MIN_RELAY_TX_FEE:
-            self.show_message( "This transaction requires a fee, or it will not be propagated by the network." )
+            self.show_message( "This transaction requires a higher fee, or it will not be propagated by the network." )
             return
 
             

lib/bitcoin.py

@@ -577,6 +577,7 @@ class BIP32Sequence:
 
 ################################## transactions
 
+MIN_RELAY_TX_FEE = 10000
 
 class Transaction:
     
@@ -877,15 +878,23 @@ class Transaction:
 
 
     def requires_fee(self, verifier):
+        # see https://en.bitcoin.it/wiki/Transaction_fees
         threshold = 57600000
         size = len(self.raw)/2
+        if size >= 10000: 
+            return True
+
+        for o in self.outputs:
+            value = o[1]
+            if value < 1000000:
+                return True
         sum = 0
         for i in self.inputs:
             age = verifier.get_confirmations(i["tx_hash"])[0]
             sum += i["value"] * age
         priority = sum / size
         print_error(priority, threshold)
-        return priority < threshold
+        return priority < threshold 
 
 
 

lib/wallet.py

@@ -912,6 +912,7 @@ class Wallet:
                 height = None
                 for h in ext_h:
                     if h == ['*']: continue
+                    print_error(h)
                     for item in h:
                         if item.get('tx_hash') == tx_hash:
                             height = item.get('height')