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- Added support for device scanning in switch.wemo plugin

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- Added generic interface for workers to run jobs in parallel
This commit is contained in:
Fabio Manganiello 2019-12-15 19:42:48 +01:00
parent 5481990834
commit 6082eb62d5
4 changed files with 301 additions and 55 deletions
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108
platypush/plugins/switch/wemo/__init__.py
View file

@ -1,18 +1,10 @@
import enum
import re
import textwrap
from xml.dom.minidom import parseString
import requests
import ipaddress
from platypush.plugins import action
from platypush.plugins.switch import SwitchPlugin
class SwitchAction(enum.Enum):
GET_STATE = 'GetBinaryState'
SET_STATE = 'SetBinaryState'
GET_NAME = 'GetFriendlyName'
from platypush.utils.workers import Workers
from .lib import WemoRunner
from .scanner import Scanner
class SwitchWemoPlugin(SwitchPlugin):
@ -27,19 +19,29 @@ class SwitchWemoPlugin(SwitchPlugin):
_default_port = 49153
def __init__(self, devices=None, **kwargs):
def __init__(self, devices=None, netmask: str = None, port: int = _default_port, **kwargs):
"""
:param devices: List of IP addresses or name->address map containing the WeMo Switch devices to control.
This plugin previously used ouimeaux for auto-discovery but it's been dropped because
1. too slow 2. too heavy 3. auto-discovery failed too often.
:type devices: list or dict
:param netmask: Alternatively to a list of static IP->name pairs, you can specify the network mask where
the devices should be scanned (e.g. '192.168.1.0/24')
:param port: Port where the WeMo devices are expected to expose the RPC/XML over HTTP service (default: 49153)
"""
super().__init__(**kwargs)
self._port = self._default_port
self.port = port
self.netmask = netmask
self._devices = {}
self._init_devices(devices)
def _init_devices(self, devices):
if devices:
self._devices = devices if isinstance(devices, dict) else \
{addr: addr for addr in devices}
self._devices.update(devices if isinstance(devices, dict) else
{addr: addr for addr in devices})
else:
self._devices = {}
@ -71,51 +73,25 @@ class SwitchWemoPlugin(SwitchPlugin):
for device in self._devices.values()
]
# noinspection PyShadowingNames
def _exec(self, device: str, action: SwitchAction, port: int = _default_port, value=None):
def _get_address(self, device: str) -> str:
if device not in self._addresses:
try:
device = self._devices[device]
return self._devices[device]
except KeyError:
pass
state_name = action.value[3:]
response = requests.post(
'http://{}:{}/upnp/control/basicevent1'.format(device, port),
headers={
'User-Agent': '',
'Accept': '',
'Content-Type': 'text/xml; charset="utf-8"',
'SOAPACTION': '\"urn:Belkin:service:basicevent:1#{}\"'.format(action.value),
},
data=re.sub('\s+', ' ', textwrap.dedent(
'''
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:{action} xmlns:u="urn:Belkin:service:basicevent:1">
<{state}>{value}</{state}>
</u:{action}
></s:Body>
</s:Envelope>
'''.format(action=action.value, state=state_name,
value=value if value is not None else ''))))
dom = parseString(response.text)
return dom.getElementsByTagName(state_name).item(0).firstChild.data
return device
@action
def status(self, device=None, *args, **kwargs):
def status(self, device: str = None, *args, **kwargs):
devices = {device: device} if device else self._devices.copy()
ret = [
{
'id': addr,
'ip': addr,
'name': name if name != addr else self.get_name(addr).output,
'on': self.get_state(addr).output,
'name': name if name != addr else WemoRunner.get_name(addr),
'on': WemoRunner.get_state(addr),
}
for (name, addr) in devices.items()
]
@ -129,7 +105,8 @@ class SwitchWemoPlugin(SwitchPlugin):
:param device: Device name or address
"""
self._exec(device=device, action=SwitchAction.SET_STATE, value=1)
device = self._get_address(device)
WemoRunner.on(device)
return self.status(device)
@action
@ -139,7 +116,8 @@ class SwitchWemoPlugin(SwitchPlugin):
:param device: Device name or address
"""
self._exec(device=device, action=SwitchAction.SET_STATE, value=0)
device = self._get_address(device)
WemoRunner.off(device)
return self.status(device)
@action
@ -149,8 +127,9 @@ class SwitchWemoPlugin(SwitchPlugin):
:param device: Device name or address
"""
state = self.get_state(device).output
return self.on(device) if not state else self.off(device)
device = self._get_address(device)
WemoRunner.toggle(device)
return self.status(device)
@action
def get_state(self, device: str):
@ -159,8 +138,8 @@ class SwitchWemoPlugin(SwitchPlugin):
:param device: Device name or address
"""
state = self._exec(device=device, action=SwitchAction.GET_STATE)
return bool(int(state))
device = self._get_address(device)
return WemoRunner.get_state(device)
@action
def get_name(self, device: str):
@ -169,7 +148,26 @@ class SwitchWemoPlugin(SwitchPlugin):
:param device: Device name or address
"""
return self._exec(device=device, action=SwitchAction.GET_NAME)
device = self._get_address(device)
return WemoRunner.get_name(device)
@action
def scan(self, netmask: str = None):
netmask = netmask or self.netmask
assert netmask, 'Scan not supported: No netmask specified'
workers = Workers(10, Scanner, port=self.port)
with workers:
for addr in ipaddress.IPv4Network(netmask):
workers.put(addr.exploded)
devices = {
dev.name: dev.addr
for dev in workers.responses
}
self._init_devices(devices)
return self.status()
# vim:sw=4:ts=4:et:

71
platypush/plugins/switch/wemo/lib.py Normal file
View file

@ -0,0 +1,71 @@
import enum
import re
import textwrap
from xml.dom.minidom import parseString
import requests
class SwitchAction(enum.Enum):
GET_STATE = 'GetBinaryState'
SET_STATE = 'SetBinaryState'
GET_NAME = 'GetFriendlyName'
class WemoRunner:
default_port = 49153
@staticmethod
def exec(device: str, action: SwitchAction, port: int = default_port, value=None):
state_name = action.value[3:]
response = requests.post(
'http://{}:{}/upnp/control/basicevent1'.format(device, port),
headers={
'User-Agent': '',
'Accept': '',
'Content-Type': 'text/xml; charset="utf-8"',
'SOAPACTION': '\"urn:Belkin:service:basicevent:1#{}\"'.format(action.value),
},
data=re.sub('\s+', ' ', textwrap.dedent(
'''
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:{action} xmlns:u="urn:Belkin:service:basicevent:1">
<{state}>{value}</{state}>
</u:{action}
></s:Body>
</s:Envelope>
'''.format(action=action.value, state=state_name,
value=value if value is not None else ''))))
dom = parseString(response.text)
return dom.getElementsByTagName(state_name).item(0).firstChild.data
@classmethod
def get_state(cls, device: str) -> bool:
state = cls.exec(device=device, action=SwitchAction.GET_STATE)
return bool(int(state))
@classmethod
def get_name(cls, device: str) -> str:
name = cls.exec(device=device, action=SwitchAction.GET_NAME)
return name
@classmethod
def on(cls, device):
cls.exec(device=device, action=SwitchAction.SET_STATE, value=1)
@classmethod
def off(cls, device):
cls.exec(device=device, action=SwitchAction.SET_STATE, value=0)
@classmethod
def toggle(cls, device):
state = cls.get_state(device)
cls.exec(device=device, action=SwitchAction.SET_STATE, value=int(not state))
# vim:sw=4:ts=4:et:

37
platypush/plugins/switch/wemo/scanner.py Normal file
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@ -0,0 +1,37 @@
import multiprocessing
import socket
from typing import Optional
from platypush.utils.workers import Worker
from .lib import WemoRunner
class ScanResult:
def __init__(self, addr: str, name: str, on: bool):
self.addr = addr
self.name = name
self.on = on
class Scanner(Worker):
timeout = 1.5
def __init__(self, request_queue: multiprocessing.Queue, response_queue: multiprocessing.Queue,
port: int = WemoRunner.default_port):
super().__init__(request_queue, response_queue)
self.port = port
def process(self, addr: str) -> Optional[ScanResult]:
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(self.timeout)
sock.connect((addr, self.port))
sock.close()
return ScanResult(addr=addr, name=WemoRunner.get_name(addr), on=WemoRunner.get_state(addr))
except OSError:
pass
# vim:sw=4:ts=4:et:

140
platypush/utils/workers.py Normal file
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@ -0,0 +1,140 @@
import multiprocessing
from abc import ABC, abstractmethod
from typing import Type
class EndOfStream:
pass
class Worker(ABC, multiprocessing.Process):
"""
Generic class for worker processes, used to split the execution of an action over multiple
parallel instances.
"""
def __init__(self, request_queue: multiprocessing.Queue, response_queue=multiprocessing.Queue):
"""
:param request_queue: The worker will listen for messages to process over this queue
:param response_queue: The worker will return responses over this queue
"""
super().__init__()
self.request_queue = request_queue
self.response_queue = response_queue
def run(self) -> None:
"""
The worker will run until it receives a :class:`EndOfStream` message on the queue.
"""
while True:
msg = self.request_queue.get()
if isinstance(msg, EndOfStream):
break
try:
ret = self.process(msg)
except Exception as e:
ret = e
if ret:
# noinspection PyArgumentList,PyCallByClass
self.response_queue.put(ret)
@abstractmethod
def process(self, msg):
"""
This method must be implemented by the derived classes.
It will take as argument a message received over the `request_queue` and will return a value that will be
processed by the consumer or None.
If this function raises an exception then the exception will be pushed to the response queue and can be
handled by the consumer.
"""
raise NotImplementedError('Must be implemented by a derived class')
def end_stream(self) -> None:
"""
This method will be called when we have no more messages to send to the worker. A special
`EndOfStream` object will be sent on the `request_queue`.
"""
self.request_queue.put(EndOfStream())
class Workers:
"""
Model for a pool of workers. Syntax:
.. code-block:: python
class Squarer(Worker):
def process(self, n):
return n * n
workers = Workers(5, Squarer) # Allocate 5 workers of type Squarer
with workers:
for n in range(100)):
workers.put(n)
print(workers.responses)
"""
def __init__(self, n_workers: int, worker_type: Type[Worker], *args, **kwargs):
"""
:param n_workers: Number of workers
:param worker_type: Type of the workers that will be instantiated. Must be a subclass of :class:`Worker`.
:param args: Extra args to pass to the `worker_type` constructor
:param kwargs: Extra kwargs to pass to the `worker_type` constructor
"""
self.request_queue = multiprocessing.Queue()
self.response_queue = multiprocessing.Queue()
# noinspection PyArgumentList
self._workers = [worker_type(self.request_queue, self.response_queue, *args, **kwargs)
for _ in range(n_workers)]
self.responses: list = []
def start(self):
for wrk in self._workers:
wrk.start()
def put(self, msg) -> None:
"""
Put a message on the `request_queue`
"""
self.request_queue.put(msg)
def wait(self) -> list:
"""
Wait for the termination of all the workers
:ret: A list containing the processed responses
"""
while self._workers:
for i, wrk in enumerate(self._workers):
if not self._workers[i].is_alive():
self._workers.pop(i)
break
self.responses = []
while not self.response_queue.empty():
self.responses.append(self.response_queue.get())
return self.responses
def end_stream(self):
"""
Mark the termination of the stream by sending an :class:`EndOfStream` message on the `request_queue` for
each of the running workers.
"""
for wrk in self._workers:
wrk.end_stream()
def __enter__(self):
self.start()
def __exit__(self, exc_type, exc_val, exc_tb):
self.end_stream()
self.wait()
# vim:sw=4:ts=4:et: