Python create_and_start_event_loop Examples

Example #1

File: block_headers.py Project: vestx/electrum-vestx

#!/usr/bin/env python3

# A simple script that connects to a server and displays block headers

import time
import asyncio

from electrum_vestx.network import Network
from electrum_vestx.util import print_msg, json_encode, create_and_start_event_loop, log_exceptions

# start network
loop, stopping_fut, loop_thread = create_and_start_event_loop()
network = Network()
network.start()

# wait until connected
while not network.is_connected():
    time.sleep(1)
    print_msg("waiting for network to get connected...")

header_queue = asyncio.Queue()


@log_exceptions
async def f():
    try:
        await network.interface.session.subscribe(
            'blockchain.headers.subscribe', [], header_queue)
        # 3. wait for results
        while network.is_connected():
            header = await header_queue.get()

Example #2

import sys
import asyncio

from electrum_vestx.network import Network
from electrum_vestx.util import print_msg, create_and_start_event_loop
from electrum_vestx.synchronizer import SynchronizerBase

try:
    addr = sys.argv[1]
except Exception:
    print("usage: watch_address <bitcoin_address>")
    sys.exit(1)

# start network
loop = create_and_start_event_loop()[0]
network = Network()
network.start()


class Notifier(SynchronizerBase):
    def __init__(self, network):
        SynchronizerBase.__init__(self, network)
        self.watched_addresses = set()
        self.watch_queue = asyncio.Queue()

    async def main(self):
        # resend existing subscriptions if we were restarted
        for addr in self.watched_addresses:
            await self._add_address(addr)
        # main loop