text: #!/usr/bin/env python3
  # Copyright (c) 2019 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 tx status in case of reorgs while wallet being shutdown.
  
  Wallet txn status rely on block connection/disconnection for its
  accuracy. In case of reorgs happening while wallet being shutdown
  block updates are not going to be received. At wallet loading, we
  check against chain if confirmed txn are still in chain and change
  their status if block in which they have been included has been
  disconnected.
  """
  
  from decimal import Decimal
  import os
  import shutil
  
  from test_framework.test_framework import BitcoinTestFramework
  from test_framework.util import (
          assert_equal,
          disconnect_nodes,
  )
  
  class ReorgsRestoreTest(BitcoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 3
  
      def skip_test_if_missing_module(self):
          self.skip_if_no_wallet()
  
      def run_test(self):
          # Send a tx from which to conflict outputs later
          txid_conflict_from = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), Decimal("10"))
          self.nodes[0].generate(1)
          self.sync_blocks()
  
          # Disconnect node1 from others to reorg its chain later
          disconnect_nodes(self.nodes[0], 1)
          disconnect_nodes(self.nodes[1], 2)
          self.connect_nodes(0, 2)
  
          # Send a tx to be unconfirmed later
          txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), Decimal("10"))
          tx = self.nodes[0].gettransaction(txid)
          self.nodes[0].generate(4)
          tx_before_reorg = self.nodes[0].gettransaction(txid)
          assert_equal(tx_before_reorg["confirmations"], 4)
  
          # Disconnect node0 from node2 to broadcast a conflict on their respective chains
          disconnect_nodes(self.nodes[0], 2)
          nA = next(tx_out["vout"] for tx_out in self.nodes[0].gettransaction(txid_conflict_from)["details"] if tx_out["amount"] == Decimal("10"))
          inputs = []
          inputs.append({"txid": txid_conflict_from, "vout": nA})
          outputs_1 = {}
          outputs_2 = {}
  
          # Create a conflicted tx broadcast on node0 chain and conflicting tx broadcast on node1 chain. Both spend from txid_conflict_from
          outputs_1[self.nodes[0].getnewaddress()] = Decimal("9.99998")
          outputs_2[self.nodes[0].getnewaddress()] = Decimal("9.99998")
          conflicted = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs, outputs_1))
          conflicting = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs, outputs_2))
  
          conflicted_txid = self.nodes[0].sendrawtransaction(conflicted["hex"])
          self.nodes[0].generate(1)
          conflicting_txid = self.nodes[2].sendrawtransaction(conflicting["hex"])
          self.nodes[2].generate(9)
  
          # Reconnect node0 and node2 and check that conflicted_txid is effectively conflicted
          self.connect_nodes(0, 2)
          self.sync_blocks([self.nodes[0], self.nodes[2]])
          conflicted = self.nodes[0].gettransaction(conflicted_txid)
          conflicting = self.nodes[0].gettransaction(conflicting_txid)
          assert_equal(conflicted["confirmations"], -9)
          assert_equal(conflicted["walletconflicts"][0], conflicting["txid"])
  
          # Node0 wallet is shutdown
          self.restart_node(0)
  
          # The block chain re-orgs and the tx is included in a different block
          self.nodes[1].generate(9)
          self.nodes[1].sendrawtransaction(tx["hex"])
          self.nodes[1].generate(1)
          self.nodes[1].sendrawtransaction(conflicted["hex"])
          self.nodes[1].generate(1)
  
          # Node0 wallet file is loaded on longest sync'ed node1
          self.stop_node(1)
          self.nodes[0].backupwallet(os.path.join(self.nodes[0].datadir, 'wallet.bak'))
          shutil.copyfile(os.path.join(self.nodes[0].datadir, 'wallet.bak'), os.path.join(self.nodes[1].datadir, self.chain, self.default_wallet_name, self.wallet_data_filename))
          self.start_node(1)
          tx_after_reorg = self.nodes[1].gettransaction(txid)
          # Check that normal confirmed tx is confirmed again but with different blockhash
          assert_equal(tx_after_reorg["confirmations"], 2)
          assert(tx_before_reorg["blockhash"] != tx_after_reorg["blockhash"])
          conflicted_after_reorg = self.nodes[1].gettransaction(conflicted_txid)
          # Check that conflicted tx is confirmed again with blockhash different than previously conflicting tx
          assert_equal(conflicted_after_reorg["confirmations"], 1)
          assert(conflicting["blockhash"] != conflicted_after_reorg["blockhash"])
  
  if __name__ == '__main__':
      ReorgsRestoreTest().main()
  