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Current File : //usr/share/doc/python3-zeroconf/examples/async_browser.py

#!/usr/bin/env python3

""" Example of browsing for a service.

The default is HTTP and HAP; use --find to search for all available services in the network
"""

import argparse
import asyncio
import logging
from typing import Any, Optional, cast

from zeroconf import IPVersion, ServiceStateChange, Zeroconf
from zeroconf.asyncio import AsyncServiceBrowser, AsyncServiceInfo, AsyncZeroconf, AsyncZeroconfServiceTypes


def async_on_service_state_change(
    zeroconf: Zeroconf, service_type: str, name: str, state_change: ServiceStateChange
) -> None:
    print(f"Service {name} of type {service_type} state changed: {state_change}")
    if state_change is not ServiceStateChange.Added:
        return
    asyncio.ensure_future(async_display_service_info(zeroconf, service_type, name))


async def async_display_service_info(zeroconf: Zeroconf, service_type: str, name: str) -> None:
    info = AsyncServiceInfo(service_type, name)
    await info.async_request(zeroconf, 3000)
    print("Info from zeroconf.get_service_info: %r" % (info))
    if info:
        addresses = ["%s:%d" % (addr, cast(int, info.port)) for addr in info.parsed_scoped_addresses()]
        print("  Name: %s" % name)
        print("  Addresses: %s" % ", ".join(addresses))
        print("  Weight: %d, priority: %d" % (info.weight, info.priority))
        print(f"  Server: {info.server}")
        if info.properties:
            print("  Properties are:")
            for key, value in info.properties.items():
                print(f"    {key}: {value}")
        else:
            print("  No properties")
    else:
        print("  No info")
    print('\n')


class AsyncRunner:
    def __init__(self, args: Any) -> None:
        self.args = args
        self.aiobrowser: Optional[AsyncServiceBrowser] = None
        self.aiozc: Optional[AsyncZeroconf] = None

    async def async_run(self) -> None:
        self.aiozc = AsyncZeroconf(ip_version=ip_version)

        services = ["_http._tcp.local.", "_hap._tcp.local."]
        if self.args.find:
            services = list(
                await AsyncZeroconfServiceTypes.async_find(aiozc=self.aiozc, ip_version=ip_version)
            )

        print("\nBrowsing %s service(s), press Ctrl-C to exit...\n" % services)
        self.aiobrowser = AsyncServiceBrowser(
            self.aiozc.zeroconf, services, handlers=[async_on_service_state_change]
        )
        while True:
            await asyncio.sleep(1)

    async def async_close(self) -> None:
        assert self.aiozc is not None
        assert self.aiobrowser is not None
        await self.aiobrowser.async_cancel()
        await self.aiozc.async_close()


if __name__ == '__main__':
    logging.basicConfig(level=logging.DEBUG)

    parser = argparse.ArgumentParser()
    parser.add_argument('--debug', action='store_true')
    parser.add_argument('--find', action='store_true', help='Browse all available services')
    version_group = parser.add_mutually_exclusive_group()
    version_group.add_argument('--v6', action='store_true')
    version_group.add_argument('--v6-only', action='store_true')
    args = parser.parse_args()

    if args.debug:
        logging.getLogger('zeroconf').setLevel(logging.DEBUG)
    if args.v6:
        ip_version = IPVersion.All
    elif args.v6_only:
        ip_version = IPVersion.V6Only
    else:
        ip_version = IPVersion.V4Only

    loop = asyncio.get_event_loop()
    runner = AsyncRunner(args)
    try:
        loop.run_until_complete(runner.async_run())
    except KeyboardInterrupt:
        loop.run_until_complete(runner.async_close())

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