text: #!/usr/bin/env python3
  # Copyright (c) 2014-2016 The Bitcoin Core developers
  # Copyright (c) 2017 The Raven 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 RavenTestFramework
  from test_framework.util import *
  
  # Create one-input, one-output, no-fee transaction:
  class MempoolCoinbaseTest(RavenTestFramework):
      def set_test_params(self):
          self.num_nodes = 2
          self.extra_args = [["-checkmempool"]] * 2
  
      alert_filename = None  # Set by setup_network
  
      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, 4999.99)
          spend_102_raw = create_tx(self.nodes[0], coinbase_txids[2], node0_address, 4999.99)
          spend_103_raw = create_tx(self.nodes[0], coinbase_txids[3], node0_address, 4999.99)
  
          # 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: 4999.99})
          # 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_rpc_error(-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_rpc_error(-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, 4999.98)
          spend_103_1_raw = create_tx(self.nodes[0], spend_103_id, node1_address, 4999.98)
  
          # 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()
  