text: #!/usr/bin/env python3
  # Copyright (c) 2014-2017 The Catcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test longpolling with getblocktemplate."""
  
  from test_framework.test_framework import CatcoinTestFramework
  from test_framework.util import *
  
  import threading
  
  class LongpollThread(threading.Thread):
      def __init__(self, node):
          threading.Thread.__init__(self)
          # query current longpollid
          templat = node.getblocktemplate()
          self.longpollid = templat['longpollid']
          # create a new connection to the node, we can't use the same
          # connection from two threads
          self.node = get_rpc_proxy(node.url, 1, timeout=600, coveragedir=node.coverage_dir)
  
      def run(self):
          self.node.getblocktemplate({'longpollid':self.longpollid})
  
  class GetBlockTemplateLPTest(CatcoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 2
  
      def run_test(self):
          self.log.info("Warning: this test will take about 70 seconds in the best case. Be patient.")
          self.nodes[0].generate(10)
          templat = self.nodes[0].getblocktemplate()
          longpollid = templat['longpollid']
          # longpollid should not change between successive invocations if nothing else happens
          templat2 = self.nodes[0].getblocktemplate()
          assert(templat2['longpollid'] == longpollid)
  
          # Test 1: test that the longpolling wait if we do nothing
          thr = LongpollThread(self.nodes[0])
          thr.start()
          # check that thread still lives
          thr.join(5)  # wait 5 seconds or until thread exits
          assert(thr.is_alive())
  
          # Test 2: test that longpoll will terminate if another node generates a block
          self.nodes[1].generate(1)  # generate a block on another node
          # check that thread will exit now that new transaction entered mempool
          thr.join(5)  # wait 5 seconds or until thread exits
          assert(not thr.is_alive())
  
          # Test 3: test that longpoll will terminate if we generate a block ourselves
          thr = LongpollThread(self.nodes[0])
          thr.start()
          self.nodes[0].generate(1)  # generate a block on another node
          thr.join(5)  # wait 5 seconds or until thread exits
          assert(not thr.is_alive())
  
          # Test 4: test that introducing a new transaction into the mempool will terminate the longpoll
          thr = LongpollThread(self.nodes[0])
          thr.start()
          # generate a random transaction and submit it
          min_relay_fee = self.nodes[0].getnetworkinfo()["relayfee"]
          # min_relay_fee is fee per 1000 bytes, which should be more than enough.
          (txid, txhex, fee) = random_transaction(self.nodes, Decimal("1.1"), min_relay_fee, Decimal("0.001"), 20)
          # after one minute, every 10 seconds the mempool is probed, so in 80 seconds it should have returned
          thr.join(60 + 20)
          assert(not thr.is_alive())
  
  if __name__ == '__main__':
      GetBlockTemplateLPTest().main()
  
  