mirror of
https://github.com/dashpay/dash.git
synced 2024-12-27 21:12:48 +01:00
90 lines
3.2 KiB
Python
Executable File
90 lines
3.2 KiB
Python
Executable File
#!/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`.
|
|
|
|
The `@asyncio.coroutine` decorator and the `yield from` syntax found here
|
|
was introduced in python 3.4 and has been deprecated in favor of the `async`
|
|
and `await` keywords respectively.
|
|
|
|
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 >= 4):
|
|
print("This example only works with Python 3.4 and greater")
|
|
exit(1)
|
|
|
|
port = 28332
|
|
|
|
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)
|
|
|
|
@asyncio.coroutine
|
|
def handle(self) :
|
|
msg = yield from self.zmqSubSocket.recv_multipart()
|
|
topic = msg[0]
|
|
body = msg[1]
|
|
sequence = "Unknown"
|
|
if len(msg[-1]) == 4:
|
|
msgSequence = struct.unpack('<I', msg[-1])[-1]
|
|
sequence = str(msgSequence)
|
|
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()
|