text: #!/usr/bin/env python3
  # Copyright (c) 2018-2020 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Backwards compatibility functional test
  
  Test various backwards compatibility scenarios. Requires previous releases binaries,
  see test/README.md.
  
  v0.15.2 is not required by this test, but it is used in wallet_upgradewallet.py.
  Due to a hardfork in regtest, it can't be used to sync nodes.
  
  
  Due to RPC changes introduced in various versions the below tests
  won't work for older versions without some patches or workarounds.
  
  Use only the latest patch version of each release, unless a test specifically
  needs an older patch version.
  """
  
  import os
  import shutil
  
  from test_framework.blocktools import COINBASE_MATURITY
  from test_framework.test_framework import XCBCTestFramework
  from test_framework.descriptors import descsum_create
  
  from test_framework.util import (
      assert_equal,
      assert_raises_rpc_error,
  )
  
  
  class BackwardsCompatibilityTest(XCBCTestFramework):
      def set_test_params(self):
          self.setup_clean_chain = True
          self.num_nodes = 6
          # Add new version after each release:
          self.extra_args = [
              ["-addresstype=bech32"], # Pre-release: use to mine blocks
              ["-nowallet", "-walletrbf=1", "-addresstype=bech32"], # Pre-release: use to receive coins, swap wallets, etc
              ["-nowallet", "-walletrbf=1", "-addresstype=bech32"], # v0.19.1
              ["-nowallet", "-walletrbf=1", "-addresstype=bech32"], # v0.18.1
              ["-nowallet", "-walletrbf=1", "-addresstype=bech32"], # v0.17.2
              ["-nowallet", "-walletrbf=1", "-addresstype=bech32", "-wallet=wallet.dat"], # v0.16.3
          ]
          self.wallet_names = [self.default_wallet_name]
  
      def skip_test_if_missing_module(self):
          self.skip_if_no_wallet()
          self.skip_if_no_previous_releases()
  
      def setup_nodes(self):
          self.add_nodes(self.num_nodes, extra_args=self.extra_args, versions=[
              None,
              None,
              190100,
              180100,
              170200,
              160300,
          ])
  
          self.start_nodes()
          self.import_deterministic_coinbase_privkeys()
  
      def run_test(self):
          self.nodes[0].generatetoaddress(COINBASE_MATURITY + 1, self.nodes[0].getnewaddress())
  
          self.sync_blocks()
  
          # Sanity check the test framework:
          res = self.nodes[self.num_nodes - 1].getblockchaininfo()
          assert_equal(res['blocks'], COINBASE_MATURITY + 1)
  
          node_master = self.nodes[self.num_nodes - 5]
          node_v19 = self.nodes[self.num_nodes - 4]
          node_v18 = self.nodes[self.num_nodes - 3]
          node_v17 = self.nodes[self.num_nodes - 2]
          node_v16 = self.nodes[self.num_nodes - 1]
  
          self.log.info("Test wallet backwards compatibility...")
          # Create a number of wallets and open them in older versions:
  
          # w1: regular wallet, created on master: update this test when default
          #     wallets can no longer be opened by older versions.
          node_master.createwallet(wallet_name="w1")
          wallet = node_master.get_wallet_rpc("w1")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled']
          assert info['keypoolsize'] > 0
          # Create a confirmed transaction, receiving coins
          address = wallet.getnewaddress()
          self.nodes[0].sendtoaddress(address, 10)
          self.sync_mempools()
          self.nodes[0].generate(1)
          self.sync_blocks()
          # Create a conflicting transaction using RBF
          return_address = self.nodes[0].getnewaddress()
          tx1_id = self.nodes[1].sendtoaddress(return_address, 1)
          tx2_id = self.nodes[1].bumpfee(tx1_id)["txid"]
          # Confirm the transaction
          self.sync_mempools()
          self.nodes[0].generate(1)
          self.sync_blocks()
          # Create another conflicting transaction using RBF
          tx3_id = self.nodes[1].sendtoaddress(return_address, 1)
          tx4_id = self.nodes[1].bumpfee(tx3_id)["txid"]
          # Abandon transaction, but don't confirm
          self.nodes[1].abandontransaction(tx3_id)
  
          # w1_v19: regular wallet, created with v0.19
          node_v19.rpc.createwallet(wallet_name="w1_v19")
          wallet = node_v19.get_wallet_rpc("w1_v19")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled']
          assert info['keypoolsize'] > 0
          # Use addmultisigaddress (see #18075)
          address_18075 = wallet.rpc.addmultisigaddress(1, ["0296b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52", "037211a824f55b505228e4c3d5194c1fcfaa15a456abdf37f9b9d97a4040afc073"], "", "legacy")["address"]
          assert wallet.getaddressinfo(address_18075)["solvable"]
  
          # w1_v18: regular wallet, created with v0.18
          node_v18.rpc.createwallet(wallet_name="w1_v18")
          wallet = node_v18.get_wallet_rpc("w1_v18")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled']
          assert info['keypoolsize'] > 0
  
          # w2: wallet with private keys disabled, created on master: update this
          #     test when default wallets private keys disabled can no longer be
          #     opened by older versions.
          node_master.createwallet(wallet_name="w2", disable_private_keys=True)
          wallet = node_master.get_wallet_rpc("w2")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled'] == False
          assert info['keypoolsize'] == 0
  
          # w2_v19: wallet with private keys disabled, created with v0.19
          node_v19.rpc.createwallet(wallet_name="w2_v19", disable_private_keys=True)
          wallet = node_v19.get_wallet_rpc("w2_v19")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled'] == False
          assert info['keypoolsize'] == 0
  
          # w2_v18: wallet with private keys disabled, created with v0.18
          node_v18.rpc.createwallet(wallet_name="w2_v18", disable_private_keys=True)
          wallet = node_v18.get_wallet_rpc("w2_v18")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled'] == False
          assert info['keypoolsize'] == 0
  
          # w3: blank wallet, created on master: update this
          #     test when default blank wallets can no longer be opened by older versions.
          node_master.createwallet(wallet_name="w3", blank=True)
          wallet = node_master.get_wallet_rpc("w3")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled']
          assert info['keypoolsize'] == 0
  
          # w3_v19: blank wallet, created with v0.19
          node_v19.rpc.createwallet(wallet_name="w3_v19", blank=True)
          wallet = node_v19.get_wallet_rpc("w3_v19")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled']
          assert info['keypoolsize'] == 0
  
          # w3_v18: blank wallet, created with v0.18
          node_v18.rpc.createwallet(wallet_name="w3_v18", blank=True)
          wallet = node_v18.get_wallet_rpc("w3_v18")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled']
          assert info['keypoolsize'] == 0
  
          # Copy the wallets to older nodes:
          node_master_wallets_dir = os.path.join(node_master.datadir, "regtest/wallets")
          node_v19_wallets_dir = os.path.join(node_v19.datadir, "regtest/wallets")
          node_v18_wallets_dir = os.path.join(node_v18.datadir, "regtest/wallets")
          node_v17_wallets_dir = os.path.join(node_v17.datadir, "regtest/wallets")
          node_v16_wallets_dir = os.path.join(node_v16.datadir, "regtest")
          node_master.unloadwallet("w1")
          node_master.unloadwallet("w2")
          node_v19.unloadwallet("w1_v19")
          node_v19.unloadwallet("w2_v19")
          node_v18.unloadwallet("w1_v18")
          node_v18.unloadwallet("w2_v18")
  
          # Copy wallets to v0.16
          for wallet in os.listdir(node_master_wallets_dir):
              shutil.copytree(
                  os.path.join(node_master_wallets_dir, wallet),
                  os.path.join(node_v16_wallets_dir, wallet)
              )
  
          # Copy wallets to v0.17
          for wallet in os.listdir(node_master_wallets_dir):
              shutil.copytree(
                  os.path.join(node_master_wallets_dir, wallet),
                  os.path.join(node_v17_wallets_dir, wallet)
              )
          for wallet in os.listdir(node_v18_wallets_dir):
              shutil.copytree(
                  os.path.join(node_v18_wallets_dir, wallet),
                  os.path.join(node_v17_wallets_dir, wallet)
              )
  
          # Copy wallets to v0.18
          for wallet in os.listdir(node_master_wallets_dir):
              shutil.copytree(
                  os.path.join(node_master_wallets_dir, wallet),
                  os.path.join(node_v18_wallets_dir, wallet)
              )
  
          # Copy wallets to v0.19
          for wallet in os.listdir(node_master_wallets_dir):
              shutil.copytree(
                  os.path.join(node_master_wallets_dir, wallet),
                  os.path.join(node_v19_wallets_dir, wallet)
              )
  
          if not self.options.descriptors:
              # Descriptor wallets break compatibility, only run this test for legacy wallet
              # Open the wallets in v0.19
              node_v19.loadwallet("w1")
              wallet = node_v19.get_wallet_rpc("w1")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled']
              assert info['keypoolsize'] > 0
              txs = wallet.listtransactions()
              assert_equal(len(txs), 5)
              assert_equal(txs[1]["txid"], tx1_id)
              assert_equal(txs[2]["walletconflicts"], [tx1_id])
              assert_equal(txs[1]["replaced_by_txid"], tx2_id)
              assert not(txs[1]["abandoned"])
              assert_equal(txs[1]["confirmations"], -1)
              assert_equal(txs[2]["blockindex"], 1)
              assert txs[3]["abandoned"]
              assert_equal(txs[4]["walletconflicts"], [tx3_id])
              assert_equal(txs[3]["replaced_by_txid"], tx4_id)
              assert not(hasattr(txs[3], "blockindex"))
  
              node_v19.loadwallet("w2")
              wallet = node_v19.get_wallet_rpc("w2")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled'] == False
              assert info['keypoolsize'] == 0
  
              node_v19.loadwallet("w3")
              wallet = node_v19.get_wallet_rpc("w3")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled']
              assert info['keypoolsize'] == 0
  
              # Open the wallets in v0.18
              node_v18.loadwallet("w1")
              wallet = node_v18.get_wallet_rpc("w1")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled']
              assert info['keypoolsize'] > 0
              txs = wallet.listtransactions()
              assert_equal(len(txs), 5)
              assert_equal(txs[1]["txid"], tx1_id)
              assert_equal(txs[2]["walletconflicts"], [tx1_id])
              assert_equal(txs[1]["replaced_by_txid"], tx2_id)
              assert not(txs[1]["abandoned"])
              assert_equal(txs[1]["confirmations"], -1)
              assert_equal(txs[2]["blockindex"], 1)
              assert txs[3]["abandoned"]
              assert_equal(txs[4]["walletconflicts"], [tx3_id])
              assert_equal(txs[3]["replaced_by_txid"], tx4_id)
              assert not(hasattr(txs[3], "blockindex"))
  
              node_v18.loadwallet("w2")
              wallet = node_v18.get_wallet_rpc("w2")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled'] == False
              assert info['keypoolsize'] == 0
  
              node_v18.loadwallet("w3")
              wallet = node_v18.get_wallet_rpc("w3")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled']
              assert info['keypoolsize'] == 0
  
              node_v17.loadwallet("w1")
              wallet = node_v17.get_wallet_rpc("w1")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled']
              assert info['keypoolsize'] > 0
  
              node_v17.loadwallet("w2")
              wallet = node_v17.get_wallet_rpc("w2")
              info = wallet.getwalletinfo()
              assert info['private_keys_enabled'] == False
              assert info['keypoolsize'] == 0
          else:
              # Descriptor wallets appear to be corrupted wallets to old software
              assert_raises_rpc_error(-4, "Wallet file verification failed: wallet.dat corrupt, salvage failed", node_v19.loadwallet, "w1")
              assert_raises_rpc_error(-4, "Wallet file verification failed: wallet.dat corrupt, salvage failed", node_v19.loadwallet, "w2")
              assert_raises_rpc_error(-4, "Wallet file verification failed: wallet.dat corrupt, salvage failed", node_v19.loadwallet, "w3")
              assert_raises_rpc_error(-4, "Wallet file verification failed: wallet.dat corrupt, salvage failed", node_v18.loadwallet, "w1")
              assert_raises_rpc_error(-4, "Wallet file verification failed: wallet.dat corrupt, salvage failed", node_v18.loadwallet, "w2")
              assert_raises_rpc_error(-4, "Wallet file verification failed: wallet.dat corrupt, salvage failed", node_v18.loadwallet, "w3")
  
          # Open the wallets in v0.17
          node_v17.loadwallet("w1_v18")
          wallet = node_v17.get_wallet_rpc("w1_v18")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled']
          assert info['keypoolsize'] > 0
  
          node_v17.loadwallet("w2_v18")
          wallet = node_v17.get_wallet_rpc("w2_v18")
          info = wallet.getwalletinfo()
          assert info['private_keys_enabled'] == False
          assert info['keypoolsize'] == 0
  
          # RPC loadwallet failure causes xcbcd to exit, in addition to the RPC
          # call failure, so the following test won't work:
          # assert_raises_rpc_error(-4, "Wallet loading failed.", node_v17.loadwallet, 'w3_v18')
  
          # Instead, we stop node and try to launch it with the wallet:
          self.stop_node(4)
          node_v17.assert_start_raises_init_error(["-wallet=w3_v18"], "Error: Error loading w3_v18: Wallet requires newer version of XCBC Core")
          if self.options.descriptors:
              # Descriptor wallets appear to be corrupted wallets to old software
              node_v17.assert_start_raises_init_error(["-wallet=w1"], "Error: wallet.dat corrupt, salvage failed")
              node_v17.assert_start_raises_init_error(["-wallet=w2"], "Error: wallet.dat corrupt, salvage failed")
              node_v17.assert_start_raises_init_error(["-wallet=w3"], "Error: wallet.dat corrupt, salvage failed")
          else:
              node_v17.assert_start_raises_init_error(["-wallet=w3"], "Error: Error loading w3: Wallet requires newer version of XCBC Core")
          self.start_node(4)
  
          if not self.options.descriptors:
              # Descriptor wallets break compatibility, only run this test for legacy wallets
              # Open most recent wallet in v0.16 (no loadwallet RPC)
              self.restart_node(5, extra_args=["-wallet=w2"])
              wallet = node_v16.get_wallet_rpc("w2")
              info = wallet.getwalletinfo()
              assert info['keypoolsize'] == 1
  
          # Create upgrade wallet in v0.16
          self.restart_node(-1, extra_args=["-wallet=u1_v16"])
          wallet = node_v16.get_wallet_rpc("u1_v16")
          v16_addr = wallet.getnewaddress('', "bech32")
          v16_info = wallet.validateaddress(v16_addr)
          v16_pubkey = v16_info['pubkey']
          self.stop_node(-1)
  
          self.log.info("Test wallet upgrade path...")
          # u1: regular wallet, created with v0.17
          node_v17.rpc.createwallet(wallet_name="u1_v17")
          wallet = node_v17.get_wallet_rpc("u1_v17")
          address = wallet.getnewaddress("bech32")
          v17_info = wallet.getaddressinfo(address)
          hdkeypath = v17_info["hdkeypath"]
          pubkey = v17_info["pubkey"]
  
          if self.is_bdb_compiled():
              # Old wallets are BDB and will only work if BDB is compiled
              # Copy the 0.16 wallet to the last XCBC Core version and open it:
              shutil.copyfile(
                  os.path.join(node_v16_wallets_dir, "wallets/u1_v16"),
                  os.path.join(node_master_wallets_dir, "u1_v16")
              )
              load_res = node_master.loadwallet("u1_v16")
              # Make sure this wallet opens without warnings. See https://github.com/ComputationBenefactorCoin/xcbc/pull/19054
              assert_equal(load_res['warning'], '')
              wallet = node_master.get_wallet_rpc("u1_v16")
              info = wallet.getaddressinfo(v16_addr)
              descriptor = "wpkh([" + info["hdmasterfingerprint"] + hdkeypath[1:] + "]" + v16_pubkey + ")"
              assert_equal(info["desc"], descsum_create(descriptor))
  
              # Now copy that same wallet back to 0.16 to make sure no automatic upgrade breaks it
              os.remove(os.path.join(node_v16_wallets_dir, "wallets/u1_v16"))
              shutil.copyfile(
                  os.path.join(node_master_wallets_dir, "u1_v16"),
                  os.path.join(node_v16_wallets_dir, "wallets/u1_v16")
              )
              self.start_node(-1, extra_args=["-wallet=u1_v16"])
              wallet = node_v16.get_wallet_rpc("u1_v16")
              info = wallet.validateaddress(v16_addr)
              assert_equal(info, v16_info)
  
              # Copy the 0.17 wallet to the last XCBC Core version and open it:
              node_v17.unloadwallet("u1_v17")
              shutil.copytree(
                  os.path.join(node_v17_wallets_dir, "u1_v17"),
                  os.path.join(node_master_wallets_dir, "u1_v17")
              )
              node_master.loadwallet("u1_v17")
              wallet = node_master.get_wallet_rpc("u1_v17")
              info = wallet.getaddressinfo(address)
              descriptor = "wpkh([" + info["hdmasterfingerprint"] + hdkeypath[1:] + "]" + pubkey + ")"
              assert_equal(info["desc"], descsum_create(descriptor))
  
              # Now copy that same wallet back to 0.17 to make sure no automatic upgrade breaks it
              node_master.unloadwallet("u1_v17")
              shutil.rmtree(os.path.join(node_v17_wallets_dir, "u1_v17"))
              shutil.copytree(
                  os.path.join(node_master_wallets_dir, "u1_v17"),
                  os.path.join(node_v17_wallets_dir, "u1_v17")
              )
              node_v17.loadwallet("u1_v17")
              wallet = node_v17.get_wallet_rpc("u1_v17")
              info = wallet.getaddressinfo(address)
              assert_equal(info, v17_info)
  
              # Copy the 0.19 wallet to the last XCBC Core version and open it:
              shutil.copytree(
                  os.path.join(node_v19_wallets_dir, "w1_v19"),
                  os.path.join(node_master_wallets_dir, "w1_v19")
              )
              node_master.loadwallet("w1_v19")
              wallet = node_master.get_wallet_rpc("w1_v19")
              assert wallet.getaddressinfo(address_18075)["solvable"]
  
              # Now copy that same wallet back to 0.19 to make sure no automatic upgrade breaks it
              node_master.unloadwallet("w1_v19")
              shutil.rmtree(os.path.join(node_v19_wallets_dir, "w1_v19"))
              shutil.copytree(
                  os.path.join(node_master_wallets_dir, "w1_v19"),
                  os.path.join(node_v19_wallets_dir, "w1_v19")
              )
              node_v19.loadwallet("w1_v19")
              wallet = node_v19.get_wallet_rpc("w1_v19")
              assert wallet.getaddressinfo(address_18075)["solvable"]
  
  if __name__ == '__main__':
      BackwardsCompatibilityTest().main()
  