text: #!/usr/bin/env python3
  # Copyright (c) 2015-2016 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 ZMQ interface
  #
  
  from test_framework.test_framework import BTSTestFramework
  from test_framework.util import *
  import zmq
  import struct
  
  import http.client
  import urllib.parse
  
  class ZMQTest (BTSTestFramework):
  
      def __init__(self):
          super().__init__()
          self.num_nodes = 4
  
      port = 25555
  
      def setup_nodes(self):
          self.zmqContext = zmq.Context()
          self.zmqSubSocket = self.zmqContext.socket(zmq.SUB)
          self.zmqSubSocket.setsockopt(zmq.SUBSCRIBE, b"hashblock")
          self.zmqSubSocket.setsockopt(zmq.SUBSCRIBE, b"hashtx")
          self.zmqSubSocket.connect("tcp://127.0.0.1:%i" % self.port)
          return start_nodes(self.num_nodes, self.options.tmpdir, extra_args=[
              ['-zmqpubhashtx=tcp://127.0.0.1:'+str(self.port), '-zmqpubhashblock=tcp://127.0.0.1:'+str(self.port)],
              [],
              [],
              []
              ])
  
      def run_test(self):
          self.sync_all()
  
          genhashes = self.nodes[0].generate(1)
          self.sync_all()
  
          print("listen...")
          msg = self.zmqSubSocket.recv_multipart()
          topic = msg[0]
          assert_equal(topic, b"hashtx")
          body = msg[1]
          nseq = msg[2]
          msgSequence = struct.unpack('<I', msg[-1])[-1]
          assert_equal(msgSequence, 0) #must be sequence 0 on hashtx
  
          msg = self.zmqSubSocket.recv_multipart()
          topic = msg[0]
          body = msg[1]
          msgSequence = struct.unpack('<I', msg[-1])[-1]
          assert_equal(msgSequence, 0) #must be sequence 0 on hashblock
          blkhash = bytes_to_hex_str(body)
  
          assert_equal(genhashes[0], blkhash) #blockhash from generate must be equal to the hash received over zmq
  
          n = 10
          genhashes = self.nodes[1].generate(n)
          self.sync_all()
  
          zmqHashes = []
          blockcount = 0
          for x in range(0,n*2):
              msg = self.zmqSubSocket.recv_multipart()
              topic = msg[0]
              body = msg[1]
              if topic == b"hashblock":
                  zmqHashes.append(bytes_to_hex_str(body))
                  msgSequence = struct.unpack('<I', msg[-1])[-1]
                  assert_equal(msgSequence, blockcount+1)
                  blockcount += 1
  
          for x in range(0,n):
              assert_equal(genhashes[x], zmqHashes[x]) #blockhash from generate must be equal to the hash received over zmq
  
          #test tx from a second node
          hashRPC = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1.0)
          self.sync_all()
  
          # now we should receive a zmq msg because the tx was broadcast
          msg = self.zmqSubSocket.recv_multipart()
          topic = msg[0]
          body = msg[1]
          hashZMQ = ""
          if topic == b"hashtx":
              hashZMQ = bytes_to_hex_str(body)
              msgSequence = struct.unpack('<I', msg[-1])[-1]
              assert_equal(msgSequence, blockcount+1)
  
          assert_equal(hashRPC, hashZMQ) #blockhash from generate must be equal to the hash received over zmq
  
  
  if __name__ == '__main__':
      ZMQTest ().main ()
  