1 files changed, 107 insertions, 0 deletions
diff --git a/test/functional/mempool_reorg.py b/test/functional/mempool_reorg.py
new file mode 100755
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+++ b/test/functional/mempool_reorg.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python3
+# Copyright (c) 2014-2016 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 mempool re-org scenarios.
+
+Test re-org scenarios with a mempool that contains transactions
+that spend (directly or indirectly) coinbase transactions.
+"""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import *
+
+# Create one-input, one-output, no-fee transaction:
+class MempoolCoinbaseTest(BitcoinTestFramework):
+    def __init__(self):
+        super().__init__()
+        self.num_nodes = 2
+        self.setup_clean_chain = False
+
+    alert_filename = None  # Set by setup_network
+
+    def setup_network(self):
+        args = ["-checkmempool"]
+        self.nodes = []
+        self.nodes.append(start_node(0, self.options.tmpdir, args))
+        self.nodes.append(start_node(1, self.options.tmpdir, args))
+        connect_nodes(self.nodes[1], 0)
+        self.is_network_split = False
+        self.sync_all()
+
+    def run_test(self):
+        # Start with a 200 block chain
+        assert_equal(self.nodes[0].getblockcount(), 200)
+
+        # Mine four blocks. After this, nodes[0] blocks
+        # 101, 102, and 103 are spend-able.
+        new_blocks = self.nodes[1].generate(4)
+        self.sync_all()
+
+        node0_address = self.nodes[0].getnewaddress()
+        node1_address = self.nodes[1].getnewaddress()
+
+        # Three scenarios for re-orging coinbase spends in the memory pool:
+        # 1. Direct coinbase spend  :  spend_101
+        # 2. Indirect (coinbase spend in chain, child in mempool) : spend_102 and spend_102_1
+        # 3. Indirect (coinbase and child both in chain) : spend_103 and spend_103_1
+        # Use invalidatblock to make all of the above coinbase spends invalid (immature coinbase),
+        # and make sure the mempool code behaves correctly.
+        b = [ self.nodes[0].getblockhash(n) for n in range(101, 105) ]
+        coinbase_txids = [ self.nodes[0].getblock(h)['tx'][0] for h in b ]
+        spend_101_raw = create_tx(self.nodes[0], coinbase_txids[1], node1_address, 49.99)
+        spend_102_raw = create_tx(self.nodes[0], coinbase_txids[2], node0_address, 49.99)
+        spend_103_raw = create_tx(self.nodes[0], coinbase_txids[3], node0_address, 49.99)
+
+        # Create a transaction which is time-locked to two blocks in the future
+        timelock_tx = self.nodes[0].createrawtransaction([{"txid": coinbase_txids[0], "vout": 0}], {node0_address: 49.99})
+        # Set the time lock
+        timelock_tx = timelock_tx.replace("ffffffff", "11111191", 1)
+        timelock_tx = timelock_tx[:-8] + hex(self.nodes[0].getblockcount() + 2)[2:] + "000000"
+        timelock_tx = self.nodes[0].signrawtransaction(timelock_tx)["hex"]
+        # This will raise an exception because the timelock transaction is too immature to spend
+        assert_raises_jsonrpc(-26, "non-final", self.nodes[0].sendrawtransaction, timelock_tx)
+
+        # Broadcast and mine spend_102 and 103:
+        spend_102_id = self.nodes[0].sendrawtransaction(spend_102_raw)
+        spend_103_id = self.nodes[0].sendrawtransaction(spend_103_raw)
+        self.nodes[0].generate(1)
+        # Time-locked transaction is still too immature to spend
+        assert_raises_jsonrpc(-26,'non-final', self.nodes[0].sendrawtransaction, timelock_tx)
+
+        # Create 102_1 and 103_1:
+        spend_102_1_raw = create_tx(self.nodes[0], spend_102_id, node1_address, 49.98)
+        spend_103_1_raw = create_tx(self.nodes[0], spend_103_id, node1_address, 49.98)
+
+        # Broadcast and mine 103_1:
+        spend_103_1_id = self.nodes[0].sendrawtransaction(spend_103_1_raw)
+        last_block = self.nodes[0].generate(1)
+        # Time-locked transaction can now be spent
+        timelock_tx_id = self.nodes[0].sendrawtransaction(timelock_tx)
+
+        # ... now put spend_101 and spend_102_1 in memory pools:
+        spend_101_id = self.nodes[0].sendrawtransaction(spend_101_raw)
+        spend_102_1_id = self.nodes[0].sendrawtransaction(spend_102_1_raw)
+
+        self.sync_all()
+
+        assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, timelock_tx_id})
+
+        for node in self.nodes:
+            node.invalidateblock(last_block[0])
+        # Time-locked transaction is now too immature and has been removed from the mempool
+        # spend_103_1 has been re-orged out of the chain and is back in the mempool
+        assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, spend_103_1_id})
+
+        # Use invalidateblock to re-org back and make all those coinbase spends
+        # immature/invalid:
+        for node in self.nodes:
+            node.invalidateblock(new_blocks[0])
+
+        self.sync_all()
+
+        # mempool should be empty.
+        assert_equal(set(self.nodes[0].getrawmempool()), set())
+
+if __name__ == '__main__':
+    MempoolCoinbaseTest().main()