text: #!/usr/bin/env python3
  # Copyright (c) 2015-2019 The GleecBTC Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test BIP65 (CHECKLOCKTIMEVERIFY).
  
  Test that the CHECKLOCKTIMEVERIFY soft-fork activates at (regtest) block height
  1351.
  """
  
  from test_framework.blocktools import create_coinbase, create_block, create_transaction
  from test_framework.messages import CTransaction, msg_block, ToHex
  from test_framework.mininode import P2PInterface
  from test_framework.script import CScript, OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP, CScriptNum
  from test_framework.test_framework import GleecBTCTestFramework
  from test_framework.util import (
      assert_equal,
      hex_str_to_bytes,
  )
  
  from io import BytesIO
  
  CLTV_HEIGHT = 1351
  
  # Reject codes that we might receive in this test
  REJECT_INVALID = 16
  REJECT_NONSTANDARD = 64
  
  def cltv_invalidate(tx):
      '''Modify the signature in vin 0 of the tx to fail CLTV
  
      Prepends -1 CLTV DROP in the scriptSig itself.
  
      TODO: test more ways that transactions using CLTV could be invalid (eg
      locktime requirements fail, sequence time requirements fail, etc).
      '''
      tx.vin[0].scriptSig = CScript([OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
                                    list(CScript(tx.vin[0].scriptSig)))
  
  def cltv_validate(node, tx, height):
      '''Modify the signature in vin 0 of the tx to pass CLTV
      Prepends <height> CLTV DROP in the scriptSig, and sets
      the locktime to height'''
      tx.vin[0].nSequence = 0
      tx.nLockTime = height
  
      # Need to re-sign, since nSequence and nLockTime changed
      signed_result = node.signrawtransactionwithwallet(ToHex(tx))
      new_tx = CTransaction()
      new_tx.deserialize(BytesIO(hex_str_to_bytes(signed_result['hex'])))
  
      new_tx.vin[0].scriptSig = CScript([CScriptNum(height), OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
                                    list(CScript(new_tx.vin[0].scriptSig)))
      return new_tx
  
  
  class BIP65Test(GleecBTCTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
          self.extra_args = [[
              '-whitelist=127.0.0.1',
              '-par=1',  # Use only one script thread to get the exact reject reason for testing
              '-acceptnonstdtxn=1',  # cltv_invalidate is nonstandard
          ]]
          self.setup_clean_chain = True
          self.rpc_timeout = 120
  
      def skip_test_if_missing_module(self):
          self.skip_if_no_wallet()
  
      def test_cltv_info(self, *, is_active):
          assert_equal(self.nodes[0].getblockchaininfo()['softforks']['bip65'],
              {
                  "active": is_active,
                  "height": CLTV_HEIGHT,
                  "type": "buried",
              },
          )
  
      def run_test(self):
          self.nodes[0].add_p2p_connection(P2PInterface())
  
          self.test_cltv_info(is_active=False)
  
          self.log.info("Mining %d blocks", CLTV_HEIGHT - 2)
          self.coinbase_txids = [self.nodes[0].getblock(b)['tx'][0] for b in self.nodes[0].generate(CLTV_HEIGHT - 2)]
          self.nodeaddress = self.nodes[0].getnewaddress()
  
          self.log.info("Test that an invalid-according-to-CLTV transaction can still appear in a block")
  
          spendtx = create_transaction(self.nodes[0], self.coinbase_txids[0],
                  self.nodeaddress, amount=1.0)
          cltv_invalidate(spendtx)
          spendtx.rehash()
  
          tip = self.nodes[0].getbestblockhash()
          block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
          block = create_block(int(tip, 16), create_coinbase(CLTV_HEIGHT - 1), block_time)
          block.nVersion = 3
          block.vtx.append(spendtx)
          block.hashMerkleRoot = block.calc_merkle_root()
          block.solve()
  
          self.test_cltv_info(is_active=False)  # Not active as of current tip and next block does not need to obey rules
          self.nodes[0].p2p.send_and_ping(msg_block(block))
          self.test_cltv_info(is_active=True)  # Not active as of current tip, but next block must obey rules
          assert_equal(self.nodes[0].getbestblockhash(), block.hash)
  
          self.log.info("Test that blocks must now be at least version 4")
          tip = block.sha256
          block_time += 1
          block = create_block(tip, create_coinbase(CLTV_HEIGHT), block_time)
          block.nVersion = 3
          block.solve()
  
          with self.nodes[0].assert_debug_log(expected_msgs=['{}, bad-version(0x00000003)'.format(block.hash)]):
              self.nodes[0].p2p.send_and_ping(msg_block(block))
              assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
              self.nodes[0].p2p.sync_with_ping()
  
          self.log.info("Test that invalid-according-to-cltv transactions cannot appear in a block")
          block.nVersion = 4
  
          spendtx = create_transaction(self.nodes[0], self.coinbase_txids[1],
                  self.nodeaddress, amount=1.0)
          cltv_invalidate(spendtx)
          spendtx.rehash()
  
          # First we show that this tx is valid except for CLTV by getting it
          # rejected from the mempool for exactly that reason.
          assert_equal(
              [{'txid': spendtx.hash, 'allowed': False, 'reject-reason': '64: non-mandatory-script-verify-flag (Negative locktime)'}],
              self.nodes[0].testmempoolaccept(rawtxs=[spendtx.serialize().hex()], maxfeerate=0)
          )
  
          # Now we verify that a block with this transaction is also invalid.
          block.vtx.append(spendtx)
          block.hashMerkleRoot = block.calc_merkle_root()
          block.solve()
  
          with self.nodes[0].assert_debug_log(expected_msgs=['CheckInputs on {} failed with non-mandatory-script-verify-flag (Negative locktime)'.format(block.vtx[-1].hash)]):
              self.nodes[0].p2p.send_and_ping(msg_block(block))
              assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
              self.nodes[0].p2p.sync_with_ping()
  
          self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
          spendtx = cltv_validate(self.nodes[0], spendtx, CLTV_HEIGHT - 1)
          spendtx.rehash()
  
          block.vtx.pop(1)
          block.vtx.append(spendtx)
          block.hashMerkleRoot = block.calc_merkle_root()
          block.solve()
  
          self.test_cltv_info(is_active=True)  # Not active as of current tip, but next block must obey rules
          self.nodes[0].p2p.send_and_ping(msg_block(block))
          self.test_cltv_info(is_active=True)  # Active as of current tip
          assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
  
  
  if __name__ == '__main__':
      BIP65Test().main()
  