text: #!/usr/bin/env python3
  # Copyright (c) 2014-2016 The Gdrcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test RPCs related to blockchainstate.
  
  Test the following RPCs:
      - gettxoutsetinfo
      - getdifficulty
      - getbestblockhash
      - getblockhash
      - getblockheader
      - getchaintxstats
      - getnetworkhashps
      - verifychain
  
  Tests correspond to code in rpc/blockchain.cpp.
  """
  
  from decimal import Decimal
  import http.client
  import subprocess
  
  from test_framework.test_framework import GdrcoinTestFramework
  from test_framework.util import (
      assert_equal,
      assert_raises,
      assert_raises_rpc_error,
      assert_is_hex_string,
      assert_is_hash_string,
  )
  
  class BlockchainTest(GdrcoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
          self.extra_args = [['-stopatheight=207']]
  
      def run_test(self):
          self._test_getchaintxstats()
          self._test_gettxoutsetinfo()
          self._test_getblockheader()
          self._test_getdifficulty()
          self._test_getnetworkhashps()
          self._test_stopatheight()
          assert self.nodes[0].verifychain(4, 0)
  
      def _test_getchaintxstats(self):
          chaintxstats = self.nodes[0].getchaintxstats(1)
          # 200 txs plus genesis tx
          assert_equal(chaintxstats['txcount'], 201)
          # tx rate should be 1 per 10 minutes, or 1/600
          # we have to round because of binary math
          assert_equal(round(chaintxstats['txrate'] * 600, 10), Decimal(1))
  
      def _test_gettxoutsetinfo(self):
          node = self.nodes[0]
          res = node.gettxoutsetinfo()
  
          assert_equal(res['total_amount'], Decimal('8725.00000000'))
          assert_equal(res['transactions'], 200)
          assert_equal(res['height'], 200)
          assert_equal(res['txouts'], 200)
          assert_equal(res['bogosize'], 17000),
          assert_equal(res['bestblock'], node.getblockhash(200))
          size = res['disk_size']
          assert size > 6400
          assert size < 64000
          assert_equal(len(res['bestblock']), 64)
          assert_equal(len(res['hash_serialized_2']), 64)
  
          self.log.info("Test that gettxoutsetinfo() works for blockchain with just the genesis block")
          b1hash = node.getblockhash(1)
          node.invalidateblock(b1hash)
  
          res2 = node.gettxoutsetinfo()
          assert_equal(res2['transactions'], 0)
          assert_equal(res2['total_amount'], Decimal('0'))
          assert_equal(res2['height'], 0)
          assert_equal(res2['txouts'], 0)
          assert_equal(res2['bogosize'], 0),
          assert_equal(res2['bestblock'], node.getblockhash(0))
          assert_equal(len(res2['hash_serialized_2']), 64)
  
          self.log.info("Test that gettxoutsetinfo() returns the same result after invalidate/reconsider block")
          node.reconsiderblock(b1hash)
  
          res3 = node.gettxoutsetinfo()
          assert_equal(res['total_amount'], res3['total_amount'])
          assert_equal(res['transactions'], res3['transactions'])
          assert_equal(res['height'], res3['height'])
          assert_equal(res['txouts'], res3['txouts'])
          assert_equal(res['bogosize'], res3['bogosize'])
          assert_equal(res['bestblock'], res3['bestblock'])
          assert_equal(res['hash_serialized_2'], res3['hash_serialized_2'])
  
      def _test_getblockheader(self):
          node = self.nodes[0]
  
          assert_raises_rpc_error(-5, "Block not found",
                                node.getblockheader, "nonsense")
  
          besthash = node.getbestblockhash()
          secondbesthash = node.getblockhash(199)
          header = node.getblockheader(besthash)
  
          assert_equal(header['hash'], besthash)
          assert_equal(header['height'], 200)
          assert_equal(header['confirmations'], 1)
          assert_equal(header['previousblockhash'], secondbesthash)
          assert_is_hex_string(header['chainwork'])
          assert_is_hash_string(header['hash'])
          assert_is_hash_string(header['previousblockhash'])
          assert_is_hash_string(header['merkleroot'])
          assert_is_hash_string(header['bits'], length=None)
          assert isinstance(header['time'], int)
          assert isinstance(header['mediantime'], int)
          assert isinstance(header['nonce'], int)
          assert isinstance(header['version'], int)
          assert isinstance(int(header['versionHex'], 16), int)
          assert isinstance(header['difficulty'], Decimal)
  
      def _test_getdifficulty(self):
          difficulty = self.nodes[0].getdifficulty()
          # 1 hash in 2 should be valid, so difficulty should be 1/2**31
          # binary => decimal => binary math is why we do this check
          assert abs(difficulty * 2**31 - 1) < 0.0001
  
      def _test_getnetworkhashps(self):
          hashes_per_second = self.nodes[0].getnetworkhashps()
          # This should be 2 hashes every 10 minutes or 1/300
          assert abs(hashes_per_second * 300 - 1) < 0.0001
  
      def _test_stopatheight(self):
          assert_equal(self.nodes[0].getblockcount(), 200)
          self.nodes[0].generate(6)
          assert_equal(self.nodes[0].getblockcount(), 206)
          self.log.debug('Node should not stop at this height')
          assert_raises(subprocess.TimeoutExpired, lambda: self.nodes[0].process.wait(timeout=3))
          try:
              self.nodes[0].generate(1)
          except (ConnectionError, http.client.BadStatusLine):
              pass  # The node already shut down before response
          self.log.debug('Node should stop at this height...')
          self.nodes[0].wait_until_stopped()
          self.start_node(0)
          assert_equal(self.nodes[0].getblockcount(), 207)
  
  
  if __name__ == '__main__':
      BlockchainTest().main()
  