139 lines
4.4 KiB
Python
139 lines
4.4 KiB
Python
#!/bin/env python
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import BaseHTTPServer
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import SocketServer
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import re
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import threading
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import enum
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import pifaceio
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PORT = 8080
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BIND_ADDRESS = '127.0.0.1'
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# time to wait until sending STOP_COMMAND
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WAITING_TIME = 120
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# commands
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UP_COMMAND = 0b00000000
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DOWN_COMMAND = 0b00000000
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STOP_COMMAND = 0b00000000
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# debug
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DEBUG = True
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class ScreenStates(enum.Enum):
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stop = 'stop'
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moving_up = 'moving_up'
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up = 'up'
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moving_down = 'moving_down'
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down = 'down'
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class LeinwandRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
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current_state = ScreenStates.stop
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stop_timer = None
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lock = threading.Semaphore()
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def __init__(self, request, client_address, server):
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BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, request, client_address, server)
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if DEBUG:
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pass
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else:
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LeinwandRequestHandler.pf = pifaceio.PiFace()
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def handle_screen_up(self):
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LeinwandRequestHandler.lock.acquire()
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if DEBUG:
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print('moving up...')
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else:
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LeinwandRequestHandler.pf.write(UP_COMMAND)
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LeinwandRequestHandler.current_state = ScreenStates.moving_up
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if LeinwandRequestHandler.stop_timer is not None:
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LeinwandRequestHandler.stop_timer.cancel()
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LeinwandRequestHandler.stop_timer = threading.Timer(WAITING_TIME, self.screen_stop)
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LeinwandRequestHandler.stop_timer.start()
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LeinwandRequestHandler.lock.release()
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self.send_response(200)
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print(self.current_state)
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def handle_screen_down(self):
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LeinwandRequestHandler.lock.acquire()
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if DEBUG:
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print('moving down...')
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else:
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LeinwandRequestHandler.pf.write(DOWN_COMMAND)
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LeinwandRequestHandler.current_state = ScreenStates.moving_down
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if LeinwandRequestHandler.stop_timer is not None:
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LeinwandRequestHandler.stop_timer.cancel()
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LeinwandRequestHandler.stop_timer = threading.Timer(WAITING_TIME, self.screen_stop)
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LeinwandRequestHandler.stop_timer.start()
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LeinwandRequestHandler.lock.release()
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self.send_response(200)
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def return_screen_state(self):
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print('state: %s' % self.current_state)
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self.send_response(200)
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self.send_header('content-type', 'text/plain')
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self.wfile.write('\n')
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self.wfile.write('{state: "' + LeinwandRequestHandler.current_state + '"}')
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def screen_stop(self):
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LeinwandRequestHandler.lock.acquire()
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if DEBUG:
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print('stop')
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else:
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LeinwandRequestHandler.pf.write(STOP_COMMAND)
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if LeinwandRequestHandler.current_state == ScreenStates.moving_down:
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LeinwandRequestHandler.current_state = ScreenStates.down
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elif LeinwandRequestHandler.current_state == ScreenStates.moving_up:
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LeinwandRequestHandler.current_state = ScreenStates.up
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LeinwandRequestHandler.lock.release()
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def do_GET(self):
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# output just for debugging...
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print('Request from ' + self.client_address[0])
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print(self.path)
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path_match = re.match('^/(screen)/(up|down|state)$', self.path)
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# return simple command documentation on error
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if path_match == None:
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self.send_response(404)
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self.send_header('content-type', 'text/plain')
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self.wfile.write('\n')
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self.wfile.write('Unknown command. \n\nValid commands are: \n')
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self.wfile.write('/screen/up \t move screen up\n')
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self.wfile.write('/screen/down \t move screen down\n')
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self.wfile.write('/screen/state \t get the current screen state\n')
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return
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if path_match.group(1) == 'screen':
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if path_match.group(2) == 'up':
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self.handle_screen_up()
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return
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elif path_match.group(2) == 'down':
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self.handle_screen_down()
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return
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elif path_match.group(2) == 'state':
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self.return_screen_state()
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return
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class ThreadedBaseHTTPServer(SocketServer.ThreadingMixIn, BaseHTTPServer.HTTPServer):
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pass
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if __name__ == '__main__':
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handler = LeinwandRequestHandler
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httpd = ThreadedBaseHTTPServer((BIND_ADDRESS, PORT), handler)
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httpd.serve_forever()
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