Titivillus/quest/consumers.py

#!/usr/bin/env python3
"""
Consumers available for the /quest websocket.
"""
import json

from channels.generic.websocket import WebsocketConsumer

from .events import events

class QuestConsumer(WebsocketConsumer):
	"""
	The main consumer for /quest websockets.
	"""
	def __init__(self, *args, **kwargs):
		"""
		Overriden method. Adds dictionary of events and functions to be
		used by self.receive().
		"""
		self.events = events
		super().__init__(*args, **kwargs)

	def connect(self):
		self.accept()

	def disconnect(self, close_code):
		pass

	def receive(self, text_data):
		"""
		Parses the received data as JSON and dispatches the appropirate
		event handler.
		"""
		try:
			data = json.loads(text_data)
		except json.JSONDecodeError:
			return
		event = data.get('event')
		if not event or event not in self.events.keys():
			return
		self.events[event](self, data.get('data'))

	def send(self, event, data={}):
		"""
		Overridden method. If a dictionary is provided, it is converted
		to JSON before sending it.
		If a string is provided, it is sent out directly.
		"""
		data = json.dumps({'event': event, 'data': data})
		super().send(text_data=data)