initial commit

leinwand.py

@@ -0,0 +1,106 @@
+#!/bin/env python
+
+import BaseHTTPServer
+import SocketServer
+import re
+import threading
+import enum
+import pifaceio
+
+PORT = 8080
+BIND_ADDRESS = '127.0.0.1'
+WAITING_TIME = 10
+# commands
+UP_COMMAND = 0b00000000
+DOWN_COMMAND = 0b00000000
+STOP_COMMAND = 0b00000000
+
+class ScreenStates(enum.Enum):
+    stop = 'stop'
+    moving_up = 'moving_up'
+    up = 'up'
+    moving_down = 'moving_down'
+    down = 'down'
+    
+class LeinwandRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
+    
+    current_state = ScreenStates.stop
+    stop_timer = None
+    pf = pifaceio.PiFace()
+    lock = threading.Semaphore()
+    
+    
+    def handle_screen_up(self):
+        print('moving up...')
+        LeinwandRequestHandler.pf.write(UP_COMMAND)
+        LeinwandRequestHandler.current_state = ScreenStates.moving_up
+        LeinwandRequestHandler.stop_timer = threading.Timer(WAITING_TIME, self.screen_stop)
+        LeinwandRequestHandler.stop_timer.start()
+        self.send_response(200)
+        print(self.current_state)
+            
+    def handle_screen_down(self):
+        print('moving down...')
+        LeinwandRequestHandler.pf.write(DOWN_COMMAND)
+        LeinwandRequestHandler.current_state = ScreenStates.moving_down
+        LeinwandRequestHandler.stop_timer = threading.Timer(WAITING_TIME, self.screen_stop)
+        LeinwandRequestHandler.stop_timer.start()
+        self.send_response(200)
+    
+    def return_screen_state(self):
+        print('state: %s' % self.current_state)
+        self.send_response(200)
+        self.send_header('content-type', 'text/plain')
+        self.wfile.write('\n')
+        self.wfile.write('{status: "' + LeinwandRequestHandler.current_state + '"}')
+    
+    def screen_stop(self):
+        if LeinwandRequestHandler.current_state == ScreenStates.moving_down:
+            LeinwandRequestHandler.current_state = ScreenStates.down
+        elif LeinwandRequestHandler.current_state == ScreenStates.moving_up:
+            LeinwandRequestHandler.current_state = ScreenStates.up    
+        print('stop')        
+        LeinwandRequestHandler.pf.write(STOP_COMMAND)
+     
+    
+    def do_GET(self):
+        # output just for debugging...
+        print('Request from ' +  self.client_address[0])
+        print(self.path)
+        
+        path_match = re.match('^/(screen)/(up|down|state)$', self.path)
+        
+        # return simple command documentation on error
+        if path_match == None:
+            self.send_response(404)
+            self.send_header('content-type', 'text/plain')
+            self.wfile.write('\n')
+            self.wfile.write('Unknown command. \n\nValid commands are: \n')
+            self.wfile.write('/screen/up \t move screen up\n')
+            self.wfile.write('/screen/down \t move screen down\n')
+            self.wfile.write('/screen/state \t get the current screen state\n')
+            return
+        
+        
+        if path_match.group(1) == 'screen':
+            if path_match.group(2) == 'up':
+                self.handle_screen_up()
+                return
+            elif path_match.group(2) == 'down':
+                self.handle_screen_down()
+                return
+            elif path_match.group(2) == 'state':
+                self.return_screen_state()
+                return
+        
+
+class ThreadedBaseHTTPServer(SocketServer.ThreadingMixIn, BaseHTTPServer.HTTPServer):
+    pass
+
+
+if __name__ == '__main__':
+    
+    handler = LeinwandRequestHandler
+    httpd = ThreadedBaseHTTPServer((BIND_ADDRESS, PORT), handler)
+
+    httpd.serve_forever()