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RequestHandlers.py
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RequestHandlers.py
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import tornado.web
import tornado.websocket
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)
from RepeatEvery import RepeatEvery
from TemperatureReader import TemperatureReader
from MessageFactory import MessageFactory
from MessageProducer import MessageProducerFactory
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.render("temperature_demo.html")
class OnHandler(tornado.web.RequestHandler):
def get(self):
GPIO.output(23, True)
self.write("On")
class OffHandler(tornado.web.RequestHandler):
def get(self):
GPIO.output(23, False)
self.write("Off")
class TemperatureSocketHandler(tornado.websocket.WebSocketHandler):
__waiters = set()
thread = set()
stepTemperature = 0
stepDuration = 0
temperatureControlOverriden = False
action = set()
state = False
lastState = False
currentTemperature = 0
def __init__(self, application, request, **kwargs):
self.thread = RepeatEvery(1, self.__send_temperatures)
tornado.websocket.WebSocketHandler.__init__(self, application, request, **kwargs)
def on_message(self, message):
messageObject = MessageFactory.get_message(message)
messageObject.processMessage(self)
messageProducerObject = MessageProducerFactory.get_message(self.action)
messageProducerObject.produceMessage(self)
def open(self):
TemperatureSocketHandler.__waiters.add(self)
def on_close(self):
TemperatureSocketHandler.__waiters.remove(self)
print('Connection Closed')
if len(TemperatureSocketHandler.__waiters) == 0:
print('No more clients. Stop Thread.')
self.thread.stop()
def __send_temperatures(self):
for waiter in self.__waiters:
try:
self.currentTemperature = TemperatureReader().read_temp()
if self.currentTemperature >= self.stepTemperature:
self.state = False
if self.currentTemperature < self.stepTemperature:
self.state = True
if len(self.__waiters) == 0:
break
if not self.temperatureControlOverriden:
self.toggleGPIO()
messageProducerObject = MessageProducerFactory.get_message('state_change')
if (self.lastState != self.state):
messageProducerObject.produceMessage(self)
self.lastState = self.state
messageProducerObject = MessageProducerFactory.get_message('send_temperature')
messageProducerObject.produceMessage(self)
except AttributeError as e:
print("Error sending temp", e)
break
def toggleGPIO(self):
GPIO.output(23, self.state)