seopardy/buttonreader.py

# write a thread that reads buttoninput from fifo or pyserial or something
# https://gist.github.com/elshaka/2999082
# and make this configureable
from __future__ import print_function

import os
import serial
from PySide import QtCore

from player import ButtonEvent

_inputs = {}

def _add_input(inputType, inputClass):
	global _inputs
	_inputs[inputType] = inputClass

def get_input(inputType, args, app):
	global _inputs
	if inputType not in _inputs:
		raise ValueError("'%s' is an unknown input type" % inputType)
	return _inputs[inputType](app, *args)

class BaseInput(QtCore.QThread):
	def __init__(self, app, parent=None):
		super(BaseInput, self).__init__(parent)
		self._app = app

	def _sendButtonEvent(self, btn):
		if self._app.activeWindow():
			QtCore.QCoreApplication.postEvent(self._app.activeWindow(), ButtonEvent(int(btn)))

class SerialThread(QtCore.QThread):
	dataReady = QtCore.Signal(str)

class SerialInput(BaseInput):
	def __init__(self, app, device, baudrate=9600, bytesize=8, parity='N', stopbits=1):
		super(SerialInput, self).__init__(app)
		try:
			self._serial = serial.Serial(device, baudrate, bytesize, parity, stopbits)
		except serial.SerialException as e:
			raise InputException("Error: %s" % e)

		print(" >> serial %s initialized with rate %s %s%s%s" % (device, baudrate, bytesize, parity, stopbits))

	def run(self):
		while True:
			c = self._serial.read(1)
			if len(c) == 1 and ord(c) > ord('0') and ord(c) <= ord('9'):
				self._sendButtonEvent(c)

_add_input("Serial", SerialInput)

class FifoInput(BaseInput):
	def __init__(self, app, fifoPath, debug=False):
		super(FifoInput, self).__init__(app)
		self._path = fifoPath
		self._debug = debug
		if not os.path.exists(self._path):
			try:
				os.mkfifo(self._path)
			except OSError as e:
				raise InputException("Could not create fifo '%s': %s" % (self._path, e))
		if os.path.isfile(self._path) or os.path.isdir(self._path):
			raise InputException("Fifo '%s' is not a fifo" % self._path)

		print(" >> Fifo initialized, using '%s'" % self._path)

	def run(self):
		fifo = open(self._path)
		while True:
			c = fifo.read(1)
			if len(c) == 1 and ord(c) > ord('0') and ord(c) <= ord('9'):
				self._sendButtonEvent(c)

_add_input("Fifo", FifoInput)

class InputException(Exception):
	pass