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91 lines
3.2 KiB
91 lines
3.2 KiB
#!/usr/bin/env python3
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# Copyright (c) 2014-2018 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""
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ZMQ example using python3's asyncio
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Litecoin should be started with the command line arguments:
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litecoind -testnet -daemon \
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-zmqpubrawtx=tcp://127.0.0.1:28332 \
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-zmqpubrawblock=tcp://127.0.0.1:28332 \
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-zmqpubhashtx=tcp://127.0.0.1:28332 \
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-zmqpubhashblock=tcp://127.0.0.1:28332
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We use the asyncio library here. `self.handle()` installs itself as a
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future at the end of the function. Since it never returns with the event
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loop having an empty stack of futures, this creates an infinite loop. An
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alternative is to wrap the contents of `handle` inside `while True`.
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The `@asyncio.coroutine` decorator and the `yield from` syntax found here
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was introduced in python 3.4 and has been deprecated in favor of the `async`
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and `await` keywords respectively.
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A blocking example using python 2.7 can be obtained from the git history:
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https://github.com/bitcoin/bitcoin/blob/37a7fe9e440b83e2364d5498931253937abe9294/contrib/zmq/zmq_sub.py
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"""
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import binascii
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import asyncio
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import zmq
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import zmq.asyncio
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import signal
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import struct
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import sys
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if (sys.version_info.major, sys.version_info.minor) < (3, 4):
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print("This example only works with Python 3.4 and greater")
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sys.exit(1)
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port = 28332
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class ZMQHandler():
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def __init__(self):
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self.loop = asyncio.get_event_loop()
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self.zmqContext = zmq.asyncio.Context()
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self.zmqSubSocket = self.zmqContext.socket(zmq.SUB)
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self.zmqSubSocket.setsockopt(zmq.RCVHWM, 0)
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self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "hashblock")
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self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "hashtx")
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self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "rawblock")
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self.zmqSubSocket.setsockopt_string(zmq.SUBSCRIBE, "rawtx")
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self.zmqSubSocket.connect("tcp://127.0.0.1:%i" % port)
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@asyncio.coroutine
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def handle(self) :
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msg = yield from self.zmqSubSocket.recv_multipart()
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topic = msg[0]
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body = msg[1]
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sequence = "Unknown"
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if len(msg[-1]) == 4:
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msgSequence = struct.unpack('<I', msg[-1])[-1]
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sequence = str(msgSequence)
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if topic == b"hashblock":
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print('- HASH BLOCK ('+sequence+') -')
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print(binascii.hexlify(body))
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elif topic == b"hashtx":
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print('- HASH TX ('+sequence+') -')
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print(binascii.hexlify(body))
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elif topic == b"rawblock":
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print('- RAW BLOCK HEADER ('+sequence+') -')
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print(binascii.hexlify(body[:80]))
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elif topic == b"rawtx":
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print('- RAW TX ('+sequence+') -')
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print(binascii.hexlify(body))
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# schedule ourselves to receive the next message
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asyncio.ensure_future(self.handle())
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def start(self):
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self.loop.add_signal_handler(signal.SIGINT, self.stop)
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self.loop.create_task(self.handle())
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self.loop.run_forever()
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def stop(self):
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self.loop.stop()
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self.zmqContext.destroy()
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daemon = ZMQHandler()
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daemon.start()
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