test/functional/mempool_reorg.py

   1 #!/usr/bin/env python3
   2 # Copyright (c) 2014-2016 The Bitcoin Core developers
   3 # Distributed under the MIT software license, see the accompanying
   4 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5 """Test mempool re-org scenarios.
   6
   7 Test re-org scenarios with a mempool that contains transactions
   8 that spend (directly or indirectly) coinbase transactions.
   9 """
  10
  11 from test_framework.test_framework import BitcoinTestFramework
  12 from test_framework.util import *
  13
  14 # Create one-input, one-output, no-fee transaction:
  15 class MempoolCoinbaseTest(BitcoinTestFramework):
  16     def set_test_params(self):
  17         self.num_nodes = 2
  18         self.extra_args = [["-checkmempool"]] * 2
  19
  20     alert_filename = None  # Set by setup_network
  21
  22     def run_test(self):
  23         # Start with a 200 block chain
  24         assert_equal(self.nodes[0].getblockcount(), 200)
  25
  26         # Mine four blocks. After this, nodes[0] blocks
  27         # 101, 102, and 103 are spend-able.
  28         new_blocks = self.nodes[1].generate(4)
  29         self.sync_all()
  30
  31         node0_address = self.nodes[0].getnewaddress()
  32         node1_address = self.nodes[1].getnewaddress()
  33
  34         # Three scenarios for re-orging coinbase spends in the memory pool:
  35         # 1. Direct coinbase spend  :  spend_101
  36         # 2. Indirect (coinbase spend in chain, child in mempool) : spend_102 and spend_102_1
  37         # 3. Indirect (coinbase and child both in chain) : spend_103 and spend_103_1
  38         # Use invalidatblock to make all of the above coinbase spends invalid (immature coinbase),
  39         # and make sure the mempool code behaves correctly.
  40         b = [ self.nodes[0].getblockhash(n) for n in range(101, 105) ]
  41         coinbase_txids = [ self.nodes[0].getblock(h)['tx'][0] for h in b ]
  42         spend_101_raw = create_tx(self.nodes[0], coinbase_txids[1], node1_address, 49.99)
  43         spend_102_raw = create_tx(self.nodes[0], coinbase_txids[2], node0_address, 49.99)
  44         spend_103_raw = create_tx(self.nodes[0], coinbase_txids[3], node0_address, 49.99)
  45
  46         # Create a transaction which is time-locked to two blocks in the future
  47         timelock_tx = self.nodes[0].createrawtransaction([{"txid": coinbase_txids[0], "vout": 0}], {node0_address: 49.99})
  48         # Set the time lock
  49         timelock_tx = timelock_tx.replace("ffffffff", "11111191", 1)
  50         timelock_tx = timelock_tx[:-8] + hex(self.nodes[0].getblockcount() + 2)[2:] + "000000"
  51         timelock_tx = self.nodes[0].signrawtransaction(timelock_tx)["hex"]
  52         # This will raise an exception because the timelock transaction is too immature to spend
  53         assert_raises_rpc_error(-26, "non-final", self.nodes[0].sendrawtransaction, timelock_tx)
  54
  55         # Broadcast and mine spend_102 and 103:
  56         spend_102_id = self.nodes[0].sendrawtransaction(spend_102_raw)
  57         spend_103_id = self.nodes[0].sendrawtransaction(spend_103_raw)
  58         self.nodes[0].generate(1)
  59         # Time-locked transaction is still too immature to spend
  60         assert_raises_rpc_error(-26,'non-final', self.nodes[0].sendrawtransaction, timelock_tx)
  61
  62         # Create 102_1 and 103_1:
  63         spend_102_1_raw = create_tx(self.nodes[0], spend_102_id, node1_address, 49.98)
  64         spend_103_1_raw = create_tx(self.nodes[0], spend_103_id, node1_address, 49.98)
  65
  66         # Broadcast and mine 103_1:
  67         spend_103_1_id = self.nodes[0].sendrawtransaction(spend_103_1_raw)
  68         last_block = self.nodes[0].generate(1)
  69         # Time-locked transaction can now be spent
  70         timelock_tx_id = self.nodes[0].sendrawtransaction(timelock_tx)
  71
  72         # ... now put spend_101 and spend_102_1 in memory pools:
  73         spend_101_id = self.nodes[0].sendrawtransaction(spend_101_raw)
  74         spend_102_1_id = self.nodes[0].sendrawtransaction(spend_102_1_raw)
  75
  76         self.sync_all()
  77
  78         assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, timelock_tx_id})
  79
  80         for node in self.nodes:
  81             node.invalidateblock(last_block[0])
  82         # Time-locked transaction is now too immature and has been removed from the mempool
  83         # spend_103_1 has been re-orged out of the chain and is back in the mempool
  84         assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, spend_103_1_id})
  85
  86         # Use invalidateblock to re-org back and make all those coinbase spends
  87         # immature/invalid:
  88         for node in self.nodes:
  89             node.invalidateblock(new_blocks[0])
  90
  91         self.sync_all()
  92
  93         # mempool should be empty.
  94         assert_equal(set(self.nodes[0].getrawmempool()), set())
  95
  96 if __name__ == '__main__':
  97     MempoolCoinbaseTest().main()