def __init__(self,
hostname=None,
catalogue_port=9090,
clients=None,
clients_config=None,
dnssd_enabled=False,
dnssd_instance_name=None):
self._hostname = hostname if hostname is not None else _get_hostname_fallback(
)
if not isinstance(self._hostname, six.string_types):
raise ValueError("Invalid hostname: {}".format(self._hostname))
if isinstance(clients, list):
clients = {item.protocol: item for item in clients}
self._servers = {}
self._clients = clients if clients else {}
self._clients_config = clients_config
self._catalogue_port = catalogue_port
self._catalogue_server = None
self._exposed_thing_set = ExposedThingSet()
self._servient_lock = tornado.locks.Lock()
self._is_running = False
self._dnssd_enabled = dnssd_enabled if dnssd_enabled and is_dnssd_supported(
) else False
self._dnssd_instance_name = dnssd_instance_name
self._dnssd = None
self._enabled_exposed_thing_ids = set()
if not len(self._clients):
self._build_default_clients()
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
DNS Service Discovery (based on Multicast DNS) Thing discovery service.
.. autosummary::
:toctree: _dnssd
wotpy.wot.discovery.dnssd.service
"""
from wotpy.support import is_dnssd_supported
if is_dnssd_supported() is False:
raise NotImplementedError("DNS-SD is not supported in this platform")
observable = wot.discover(thing_filter)
subscription = observable.subscribe(
on_next=lambda td_str: found.append(ThingDescription(td_str)
) or resolve())
yield future_done
assert_equal_td_sequences(found, [TD_DICT_01, TD_DICT_02])
subscription.dispose()
run_test_coroutine(test_coroutine)
@pytest.mark.skipif(not is_dnssd_supported(),
reason="Only for platforms that support DNS-SD")
def test_discovery_method_multicast_dnssd():
"""Things can be discovered usin the multicast method supported by DNS-SD."""
catalogue_port_01 = find_free_port()
catalogue_port_02 = find_free_port()
instance_name_01 = "servient-01-{}".format(Faker().pystr())
instance_name_02 = "servient-02-{}".format(Faker().pystr())
servient_01 = Servient(catalogue_port=catalogue_port_01,
dnssd_enabled=True,
dnssd_instance_name=instance_name_01)
servient_02 = Servient(catalogue_port=catalogue_port_02,
import collections
import logging
import socket
import pytest
import tornado.gen
import tornado.ioloop
from faker import Faker
from tests.utils import find_free_port
from wotpy.support import is_dnssd_supported
from wotpy.wot.servient import Servient
collect_ignore = []
if not is_dnssd_supported():
logging.warning("Skipping DNS-SD tests due to unsupported platform")
collect_ignore.extend(["test_service.py"])
@pytest.fixture
def asyncio_zeroconf():
"""Builds an aiozeroconf service instance and starts browsing for WoT Servient services.
Provides a deque that contains the service state change history."""
from aiozeroconf import Zeroconf, ServiceBrowser
from wotpy.wot.discovery.dnssd.service import DNSSDDiscoveryService
loop = tornado.ioloop.IOLoop.current()
service_history = collections.deque([])
'faker>=0.8.15,<0.9', 'Sphinx>=1.7.5,<2.0.0',
'sphinx-rtd-theme>=0.4.0,<0.5.0', 'futures>=3.1.1,<4.0.0',
'pyOpenSSL>=18.0.0,<19.0.0', 'coveralls>=1.0,<2.0', 'coverage>=5.0<6.0',
'autopep8>=1.4,<2.0', 'rope>=0.14.0,<1.0'
]
if sys.version_info[0] is 3:
test_requires.append("bump2version>=1.0,<2.0")
if is_coap_supported():
install_requires.append('aiocoap[linkheader]==0.4a1')
if is_mqtt_supported():
install_requires.append('hbmqtt>=0.9.4,<1.0')
if is_dnssd_supported():
install_requires.append('zeroconf>=0.21.3,<0.22.0')
test_requires.append('aiozeroconf==0.1.8')
this_dir = path.abspath(path.dirname(__file__))
with open(path.join(this_dir, 'README.md')) as fh:
long_description = fh.read()
setup(name='wotpy',
version=__version__,
description=
'Python implementation of a W3C WoT Runtime and the WoT Scripting API',
long_description=long_description,
long_description_content_type='text/markdown',
keywords='wot iot gateway fog w3c',
def _build_dnssd_discover_observable(self, thing_filter,
dnssd_find_kwargs):
"""Builds an Observable to discover Things using the multicast method based on DNS-SD."""
if not is_dnssd_supported():
warnings.warn("Unsupported DNS-SD multicast discovery")
# noinspection PyUnresolvedReferences
return Observable.empty()
dnssd_find_kwargs = dnssd_find_kwargs if dnssd_find_kwargs else {}
if not self._servient.dnssd:
# noinspection PyUnresolvedReferences
return Observable.empty()
def subscribe(observer):
"""Browses the Servient services using DNS-SD and retrieves the TDs that match the filters."""
state = {"stop": False}
@handle_observer_finalization(observer)
@tornado.gen.coroutine
def callback():
address_port_pairs = yield self._servient.dnssd.find(
**dnssd_find_kwargs)
def build_pair_url(idx, path=None):
addr, port = address_port_pairs[idx]
base = "http://{}:{}".format(addr, port)
path = path if path else ''
return "{}/{}".format(base, path.strip("/"))
http_client = AsyncHTTPClient()
catalogue_resps = [
http_client.fetch(build_pair_url(idx))
for idx in range(len(address_port_pairs))
]
wait_iter = tornado.gen.WaitIterator(*catalogue_resps)
while not wait_iter.done() and not state["stop"]:
try:
catalogue_resp = yield wait_iter.next()
except Exception as ex:
self._logr.warning(
"Exception on HTTP request to TD catalogue: {}".
format(ex))
else:
catalogue = json.loads(catalogue_resp.body)
if state["stop"]:
return
td_resps = yield [
http_client.fetch(
build_pair_url(wait_iter.current_index,
path=path))
for thing_id, path in six.iteritems(catalogue)
]
tds = [
ThingDescription(td_resp.body)
for td_resp in td_resps
]
tds_filtered = [
td for td in tds
if self._is_fragment_match(td, thing_filter)
]
[observer.on_next(td.to_str()) for td in tds_filtered]
def unsubscribe():
state["stop"] = True
tornado.ioloop.IOLoop.current().add_callback(callback)
return unsubscribe
# noinspection PyUnresolvedReferences
return Observable.create(subscribe)
