diff options
Diffstat (limited to 'contrib/zmq/zmq_sub.py')
| -rwxr-xr-x | contrib/zmq/zmq_sub.py | 99 |
1 files changed, 70 insertions, 29 deletions
diff --git a/contrib/zmq/zmq_sub.py b/contrib/zmq/zmq_sub.py index 6f57aa47e9..ea398a27ea 100755 --- a/contrib/zmq/zmq_sub.py +++ b/contrib/zmq/zmq_sub.py @@ -1,43 +1,84 @@ -#!/usr/bin/env python2 +#!/usr/bin/env python3 # Copyright (c) 2014-2016 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. +""" + ZMQ example using python3's asyncio + + Bitcoin should be started with the command line arguments: + bitcoind -testnet -daemon \ + -zmqpubhashblock=tcp://127.0.0.1:28332 \ + -zmqpubrawtx=tcp://127.0.0.1:28332 \ + -zmqpubhashtx=tcp://127.0.0.1:28332 \ + -zmqpubhashblock=tcp://127.0.0.1:28332 + + We use the asyncio library here. `self.handle()` installs itself as a + future at the end of the function. Since it never returns with the event + loop having an empty stack of futures, this creates an infinite loop. An + alternative is to wrap the contents of `handle` inside `while True`. + + A blocking example using python 2.7 can be obtained from the git history: + https://github.com/bitcoin/bitcoin/blob/37a7fe9e440b83e2364d5498931253937abe9294/contrib/zmq/zmq_sub.py +""" + import binascii +import asyncio import zmq +import zmq.asyncio +import signal import struct +import sys + +if not (sys.version_info.major >= 3 and sys.version_info.minor >= 5): + print("This example only works with Python 3.5 and greater") + exit(1) port = 28332 -zmqContext = zmq.Context() -zmqSubSocket = zmqContext.socket(zmq.SUB) -zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashblock") -zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashtx") -zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawblock") -zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawtx") -zmqSubSocket.connect("tcp://127.0.0.1:%i" % port) - -try: - while True: - msg = zmqSubSocket.recv_multipart() - topic = str(msg[0]) +class ZMQHandler(): + def __init__(self): + self.loop = zmq.asyncio.install() + self.zmqContext = zmq.asyncio.Context() + + self.zmqSubSocket = self.zmqContext.socket(zmq.SUB) + self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "hashblock") + self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "hashtx") + self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "rawblock") + self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "rawtx") + self.zmqSubSocket.connect("tcp://127.0.0.1:%i" % port) + + async def handle(self) : + msg = await self.zmqSubSocket.recv_multipart() + topic = msg[0] body = msg[1] - sequence = "Unknown"; + sequence = "Unknown" if len(msg[-1]) == 4: msgSequence = struct.unpack('<I', msg[-1])[-1] sequence = str(msgSequence) - if topic == "hashblock": - print '- HASH BLOCK ('+sequence+') -' - print binascii.hexlify(body) - elif topic == "hashtx": - print '- HASH TX ('+sequence+') -' - print binascii.hexlify(body) - elif topic == "rawblock": - print '- RAW BLOCK HEADER ('+sequence+') -' - print binascii.hexlify(body[:80]) - elif topic == "rawtx": - print '- RAW TX ('+sequence+') -' - print binascii.hexlify(body) - -except KeyboardInterrupt: - zmqContext.destroy() + if topic == b"hashblock": + print('- HASH BLOCK ('+sequence+') -') + print(binascii.hexlify(body)) + elif topic == b"hashtx": + print('- HASH TX ('+sequence+') -') + print(binascii.hexlify(body)) + elif topic == b"rawblock": + print('- RAW BLOCK HEADER ('+sequence+') -') + print(binascii.hexlify(body[:80])) + elif topic == b"rawtx": + print('- RAW TX ('+sequence+') -') + print(binascii.hexlify(body)) + # schedule ourselves to receive the next message + asyncio.ensure_future(self.handle()) + + def start(self): + self.loop.add_signal_handler(signal.SIGINT, self.stop) + self.loop.create_task(self.handle()) + self.loop.run_forever() + + def stop(self): + self.loop.stop() + self.zmqContext.destroy() + +daemon = ZMQHandler() +daemon.start() |