added RBF transactions support

blockchain_parser/tests/test_transaction.py

@@ -0,0 +1,34 @@
+# Copyright (C) 2015 The bitcoin-blockchain-parser developers
+#
+# This file is part of bitcoin-blockchain-parser.
+#
+# It is subject to the license terms in the LICENSE file found in the top-level
+# directory of this distribution.
+#
+# No part of bitcoin-blockchain-parser, including this file, may be copied,
+# modified, propagated, or distributed except according to the terms contained
+# in the LICENSE file.
+
+import unittest
+from binascii import a2b_hex
+from blockchain_parser.transaction import Transaction
+
+
+class TestTransaction(unittest.TestCase):
+    def test_rbf(self):
+        data = a2b_hex("01000000019222bbb054bb9f94571dfe769af5866835f2a97e8839"
+                       "59fa757de4064bed8bca01000000035101b1000000000100000000"
+                       "00000000016a01000000")
+        tx = Transaction(data)
+        self.assertTrue(tx.uses_replace_by_fee())
+
+        coinbase = a2b_hex("01000000010000000000000000000000000000000000000000"
+                           "000000000000000000000000ffffffff4203c8e405fabe6d6d"
+                           "98b0e98e3809941f1fd8cafe7c8236e27b8d1a776b1835aa54"
+                           "8bb84fe5b5f3d7010000000000000002650300aaa757eb0000"
+                           "002f736c7573682f0000000001baa98396000000001976a914"
+                           "7c154ed1dc59609e3d26abb2df2ea3d587cd8c4188ac000000"
+                           "00")
+        tx = Transaction(coinbase)
+        self.assertTrue(tx.is_coinbase())
+        self.assertFalse(tx.uses_replace_by_fee())

blockchain_parser/transaction.py

@@ -73,3 +73,24 @@ def hash(self):
         if self._hash is None:
             self._hash = format_hash(double_sha256(self.hex))
         return self._hash
+
+    def is_coinbase(self):
+        """Returns whether the transaction is a coinbase transaction"""
+        for input in self.inputs:
+            if input.transaction_hash == "0" * 64:
+                return True
+        return False
+
+    def uses_replace_by_fee(self):
+        """Returns whether the transaction opted-in for RBF"""
+        # Coinbase transactions may have a sequence number that signals RBF
+        # but they cannot use it as it's only enforced for non-coinbase txs
+        if self.is_coinbase():
+            return False
+
+        # A transactions opts-in for RBF when having an input
+        # with a sequence number < MAX_INT - 1
+        for input in self.inputs:
+            if input.sequence_number < 4294967294:
+                return True
+        return False