272 lines
10 KiB
Python
272 lines
10 KiB
Python
"""
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homeassistant.observers
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~~~~~~~~~~~~~~~~~~~~~~~
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This module provides observers that can change the state or fire
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events based on observations.
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"""
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import logging
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import csv
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import os
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from datetime import datetime, timedelta
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import threading
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import re
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import json
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import requests
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import ephem
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from . import track_time_change
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STATE_CATEGORY_SUN = "weather.sun"
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STATE_CATEGORY_NEXT_SUN_RISING = "weather.next_sun_rising"
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STATE_CATEGORY_NEXT_SUN_SETTING = "weather.next_sun_setting"
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STATE_CATEGORY_ALL_DEVICES = 'all_devices'
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STATE_CATEGORY_DEVICE_FORMAT = '{}'
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SUN_STATE_ABOVE_HORIZON = "above_horizon"
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SUN_STATE_BELOW_HORIZON = "below_horizon"
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DEVICE_STATE_NOT_HOME = 'device_not_home'
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DEVICE_STATE_HOME = 'device_home'
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# After how much time do we consider a device not home if
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# it does not show up on scans
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TIME_SPAN_FOR_ERROR_IN_SCANNING = timedelta(minutes=1)
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# Return cached results if last scan was less then this time ago
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TOMATO_MIN_TIME_BETWEEN_SCANS = timedelta(seconds=5)
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# Filename to save known devices to
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KNOWN_DEVICES_FILE = "known_devices.csv"
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def track_sun(eventbus, statemachine, latitude, longitude):
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""" Tracks the state of the sun. """
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sun = ephem.Sun()
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logger = logging.getLogger(__name__)
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def update_sun_state(now):
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""" Method to update the current state of the sun and time the next update. """
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observer = ephem.Observer()
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observer.lat = latitude
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observer.long = longitude
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next_rising = ephem.localtime(observer.next_rising(sun))
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next_setting = ephem.localtime(observer.next_setting(sun))
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if next_rising > next_setting:
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new_state = SUN_STATE_ABOVE_HORIZON
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next_change = next_setting
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else:
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new_state = SUN_STATE_BELOW_HORIZON
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next_change = next_rising
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logger.info("Sun:{}. Next change: {}".format(new_state, next_change.strftime("%H:%M")))
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statemachine.set_state(STATE_CATEGORY_SUN, new_state)
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statemachine.set_state(STATE_CATEGORY_NEXT_SUN_RISING, next_rising.isoformat())
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statemachine.set_state(STATE_CATEGORY_NEXT_SUN_SETTING, next_setting.isoformat())
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# +10 seconds to be sure that the change has occured
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track_time_change(eventbus, update_sun_state, point_in_time=next_change + timedelta(seconds=10))
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update_sun_state(None)
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class DeviceTracker(object):
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""" Class that tracks which devices are home and which are not. """
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def __init__(self, eventbus, statemachine, device_scanner):
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self.statemachine = statemachine
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self.eventbus = eventbus
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self.device_scanner = device_scanner
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self.logger = logging.getLogger(__name__)
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self.lock = threading.Lock()
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self.known_devices = {}
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# Read known devices if file exists
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if os.path.isfile(KNOWN_DEVICES_FILE):
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with open(KNOWN_DEVICES_FILE) as inp:
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default_last_seen = datetime(1990, 1, 1)
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# Temp variable to keep track of which categories we use
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# so we can ensure we have unique categories.
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used_categories = []
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for row in csv.DictReader(inp):
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device = row['device']
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row['track'] = True if row['track'] == '1' else False
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self.known_devices[device] = row
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# If we track this device setup tracking variables
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if row['track']:
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self.known_devices[device]['last_seen'] = default_last_seen
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# Make sure that each device is mapped to a unique category name
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name = row['name'] if row['name'] else "unnamed_device"
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tries = 0
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while True:
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tries += 1
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category = STATE_CATEGORY_DEVICE_FORMAT.format(name if tries == 1 else "{}_{}".format(name, tries))
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if category not in used_categories:
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break
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self.known_devices[device]['category'] = category
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used_categories.append(category)
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if len(self.device_state_categories()) == 0:
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self.logger.warning("No devices to track. Please update {}.".format(KNOWN_DEVICES_FILE))
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track_time_change(eventbus, lambda time: self.update_devices(device_scanner.scan_devices()))
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def device_state_categories(self):
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""" Returns a list containing all categories that are maintained for devices. """
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return [self.known_devices[device]['category'] for device in self.known_devices if self.known_devices[device]['track']]
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def update_devices(self, found_devices):
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""" Keep track of devices that are home, all that are not will be marked not home. """
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self.lock.acquire()
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temp_tracking_devices = [device for device in self.known_devices if self.known_devices[device]['track']]
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for device in found_devices:
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# Are we tracking this device?
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if device in temp_tracking_devices:
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temp_tracking_devices.remove(device)
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self.known_devices[device]['last_seen'] = datetime.now()
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self.statemachine.set_state(self.known_devices[device]['category'], DEVICE_STATE_HOME)
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# For all devices we did not find, set state to NH
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# But only if they have been gone for longer then the error time span
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# Because we do not want to have stuff happening when the device does
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# not show up for 1 scan beacuse of reboot etc
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for device in temp_tracking_devices:
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if datetime.now() - self.known_devices[device]['last_seen'] > TIME_SPAN_FOR_ERROR_IN_SCANNING:
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self.statemachine.set_state(self.known_devices[device]['category'], DEVICE_STATE_NOT_HOME)
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# Get the currently used statuses
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states_of_devices = [self.statemachine.get_state(category).state for category in self.device_state_categories()]
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# Update the all devices category
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all_devices_state = DEVICE_STATE_HOME if DEVICE_STATE_HOME in states_of_devices else DEVICE_STATE_NOT_HOME
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self.statemachine.set_state(STATE_CATEGORY_ALL_DEVICES, all_devices_state)
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# If we come along any unknown devices we will write them to the known devices file
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unknown_devices = [device for device in found_devices if device not in self.known_devices]
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if len(unknown_devices) > 0:
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try:
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# If file does not exist we will write the header too
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should_write_header = not os.path.isfile(KNOWN_DEVICES_FILE)
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with open(KNOWN_DEVICES_FILE, 'a') as outp:
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self.logger.info("DeviceTracker:Found {} new devices, updating {}".format(len(unknown_devices), KNOWN_DEVICES_FILE))
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writer = csv.writer(outp)
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if should_write_header:
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writer.writerow(("device", "name", "track"))
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for device in unknown_devices:
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# See if the device scanner knows the name
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temp_name = self.device_scanner.get_device_name(device)
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name = temp_name if temp_name else "unknown_device"
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writer.writerow((device, name, 0))
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self.known_devices[device] = {'name':name, 'track': False}
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except IOError:
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self.logger.exception("DeviceTracker:Error updating {} with {} new devices".format(KNOWN_DEVICES_FILE, len(unknown_devices)))
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self.lock.release()
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class TomatoDeviceScanner(object):
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""" This class queries a wireless router running Tomato firmware for connected devices.
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A description of the Tomato API can be found on
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http://paulusschoutsen.nl/blog/2013/10/tomato-api-documentation/ """
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def __init__(self, host, username, password, http_id):
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self.req = requests.Request('POST', 'http://{}/update.cgi'.format(host),
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data={'_http_id':http_id, 'exec':'devlist'},
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auth=requests.auth.HTTPBasicAuth(username, password)).prepare()
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self.logger = logging.getLogger(__name__)
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self.lock = threading.Lock()
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self.date_updated = None
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self.last_results = {"wldev": [], "dhcpd_lease": []}
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def scan_devices(self):
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""" Scans for new devices and returns a list containing found device ids. """
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self._update_tomato_info()
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return [item[1] for item in self.last_results['wldev']]
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def get_device_name(self, device):
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""" Returns the name of the given device or None if we don't know. """
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# Make sure there are results
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if not self.date_updated:
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self._update_tomato_info()
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filter_named = [item[0] for item in self.last_results['dhcpd_lease'] if item[2] == device]
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return None if len(filter_named) == 0 or filter_named[0] == "" else filter_named[0]
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def _update_tomato_info(self):
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""" Ensures the information from the Tomato router is up to date.
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Returns boolean if scanning successful. """
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self.lock.acquire()
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# if date_updated is None or the date is too old we scan for new data
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if not self.date_updated or datetime.now() - self.date_updated > TOMATO_MIN_TIME_BETWEEN_SCANS:
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self.logger.info("Tomato:Scanning")
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try:
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response = requests.Session().send(self.req)
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# Calling and parsing the Tomato api here. We only need the wldev and dhcpd_lease values.
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# See http://paulusschoutsen.nl/blog/2013/10/tomato-api-documentation/ for what's going on here.
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self.last_results = {param: json.loads(value.replace("'",'"'))
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for param, value in re.findall(r"(?P<param>\w*) = (?P<value>.*);", response.text)
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if param in ["wldev","dhcpd_lease"]}
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self.date_updated = datetime.now()
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except requests.ConnectionError:
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# If we could not connect to the router
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self.logger.exception("Tomato:Failed to connect to the router")
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except ValueError:
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# If json decoder could not parse the response
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self.logger.exception("Tomato:Failed to parse response from router")
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finally:
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self.lock.release()
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else:
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# We acquired the lock before the IF check, release it before we return True
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self.lock.release()
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