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89 lines
3.2 KiB
89 lines
3.2 KiB
#!/usr/bin/env python3 |
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# Copyright (c) 2014-2017 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 not (sys.version_info.major >= 3 and sys.version_info.minor >= 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 = zmq.asyncio.install() |
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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_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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