Port/fix txnmall.sh regression test

Ported txnmall.sh to Python, and updated to match
recent transaction malleability changes.

I also modified it so it tests both double-spending
confirmed and unconfirmed (only-in-mempool) transactions.

Renamed to txn_doublespend, since that is really what is
being tested. And told the pull-tester to run both
variations on this test.

1 files changed, 120 insertions, 0 deletions

diff --git a/qa/rpc-tests/txn_doublespend.py b/qa/rpc-tests/txn_doublespend.py
new file mode 100755
index 0000000000..6125147ebc
--- /dev/null
+++ b/qa/rpc-tests/txn_doublespend.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python
+# Copyright (c) 2014 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#
+# Test proper accounting with malleable transactions
+#
+
+from test_framework import BitcoinTestFramework
+from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
+from decimal import Decimal
+from util import *
+import os
+import shutil
+
+class TxnMallTest(BitcoinTestFramework):
+
+    def add_options(self, parser):
+        parser.add_option("--mineblock", dest="mine_block", default=False, action="store_true",
+                          help="Test double-spend of 1-confirmed transaction")
+
+    def setup_network(self):
+        # Start with split network:
+        return super(TxnMallTest, self).setup_network(True)
+
+    def run_test(self):
+        # All nodes should start with 1,250 BTC:
+        starting_balance = 1250
+        for i in range(4):
+            assert_equal(self.nodes[i].getbalance(), starting_balance)
+            self.nodes[i].getnewaddress("")  # bug workaround, coins generated assigned to first getnewaddress!
+        
+        # Assign coins to foo and bar accounts:
+        self.nodes[0].move("", "foo", 1220)
+        self.nodes[0].move("", "bar", 30)
+        assert_equal(self.nodes[0].getbalance(""), 0)
+
+        # Coins are sent to node1_address
+        node1_address = self.nodes[1].getnewaddress("from0")
+
+        # First: use raw transaction API to send 1210 BTC to node1_address,
+        # but don't broadcast:
+        (total_in, inputs) = gather_inputs(self.nodes[0], 1210)
+        change_address = self.nodes[0].getnewaddress("foo")
+        outputs = {}
+        outputs[change_address] = 40
+        outputs[node1_address] = 1210
+        rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
+        doublespend = self.nodes[0].signrawtransaction(rawtx)
+        assert_equal(doublespend["complete"], True)
+
+        # Create two transaction from node[0] to node[1]; the
+        # second must spend change from the first because the first
+        # spends all mature inputs:
+        txid1 = self.nodes[0].sendfrom("foo", node1_address, 1210, 0)
+        txid2 = self.nodes[0].sendfrom("bar", node1_address, 20, 0)
+        
+        # Have node0 mine a block:
+        if (self.options.mine_block):
+            self.nodes[0].setgenerate(True, 1)
+            sync_blocks(self.nodes[0:2])
+
+        tx1 = self.nodes[0].gettransaction(txid1)
+        tx2 = self.nodes[0].gettransaction(txid2)
+
+        # Node0's balance should be starting balance, plus 50BTC for another
+        # matured block, minus 1210, minus 20, and minus transaction fees:
+        expected = starting_balance
+        if self.options.mine_block: expected += 50
+        expected += tx1["amount"] + tx1["fee"]
+        expected += tx2["amount"] + tx2["fee"]
+        assert_equal(self.nodes[0].getbalance(), expected)
+
+        # foo and bar accounts should be debited:
+        assert_equal(self.nodes[0].getbalance("foo"), 1220+tx1["amount"]+tx1["fee"])
+        assert_equal(self.nodes[0].getbalance("bar"), 30+tx2["amount"]+tx2["fee"])
+
+        if self.options.mine_block:
+            assert_equal(tx1["confirmations"], 1)
+            assert_equal(tx2["confirmations"], 1)
+            # Node1's "from0" balance should be both transaction amounts:
+            assert_equal(self.nodes[1].getbalance("from0"), -(tx1["amount"]+tx2["amount"]))
+        else:
+            assert_equal(tx1["confirmations"], 0)
+            assert_equal(tx2["confirmations"], 0)
+        
+        # Now give doublespend to miner:
+        mutated_txid = self.nodes[2].sendrawtransaction(doublespend["hex"])
+        # ... mine a block...
+        self.nodes[2].setgenerate(True, 1)
+
+        # Reconnect the split network, and sync chain:
+        connect_nodes(self.nodes[1], 2)
+        self.nodes[2].setgenerate(True, 1)  # Mine another block to make sure we sync
+        sync_blocks(self.nodes)
+
+        # Re-fetch transaction info:
+        tx1 = self.nodes[0].gettransaction(txid1)
+        tx2 = self.nodes[0].gettransaction(txid2)
+        
+        # Both transactions should be conflicted
+        assert_equal(tx1["confirmations"], -1)
+        assert_equal(tx2["confirmations"], -1)
+
+        # Node0's total balance should be starting balance, plus 100BTC for 
+        # two more matured blocks, minus 1210 for the double-spend:
+        expected = starting_balance + 100 - 1210
+        assert_equal(self.nodes[0].getbalance(), expected)
+        assert_equal(self.nodes[0].getbalance("*"), expected)
+
+        # foo account should be debited, but bar account should not:
+        assert_equal(self.nodes[0].getbalance("foo"), 1220-1210)
+        assert_equal(self.nodes[0].getbalance("bar"), 30)
+
+        # Node1's "from" account balance should be just the mutated send:
+        assert_equal(self.nodes[1].getbalance("from0"), 1210)
+
+if __name__ == '__main__':
+    TxnMallTest().main()