4 from select import select
6 from time import time, sleep
8 asynchronous_responses = [ '400', '401', # door open/closed
9 '610', # switches changed
10 '200', '201', '202', '203', '204', '205', '206',
11 '207', '208', '209', '211', # key presses
18 class VendingException(Exception): pass
21 def __init__(self, rfh, wfh):
24 self.secret = 'SN4CKZ0RZZZZZZZZ'
28 # Initialise ourselves into a known state
31 self.wfh.write('echo off\n')
33 self.wfh.write('PING\n')
36 code = self.get_response()[0]
39 def await_prompt(self):
48 raise VendingException('failed to read input from vending machine')
49 if s == '': raise VendingException('nothing read!')
50 if (s != '#' and s != '%') and state == 1: prefix += s
51 if s == '\n' or s == '\r':
54 if (s == '#' or s == '%') and state == 1: state = 2
55 if s == ' ' and state == 2:
59 if re.search('^[0-9a-fA-F]{4}$', prefix):
60 self.challenge = int(prefix, 16)
63 def get_response(self, async = False):
68 s = self.rfh.readline()
70 raise VendingException('Input socket has closed!')
74 if code in asynchronous_responses:
75 self.handle_event(code, text)
81 def get_switches(self):
83 (code, text) = self.get_response()
85 return (False, code, text)
86 self.interpret_switches(text)
87 return (True, code, text)
89 def interpret_switches(self, text):
90 self.switches = (int(text[0:2], 16) << 8) | int(text[3:5], 16)
92 def handle_event(self, code, text):
94 self.events.append((DOOR, 1))
96 self.events.append((DOOR, 0))
98 # NOP this. Nothing handles this yet.
99 #self.events.append((SWITCH, None))
100 self.interpret_switches(text)
102 self.events.append((KEY, int(code[1:3])))
104 logging.warning('Unhandled event! (%s %s)\n'%(code,text))
106 def authed_message(self, message):
107 if self.challenge == None:
109 crc = do_crc('%c%c'%(self.challenge >> 8, self.challenge & 0xff))
110 crc = do_crc(self.secret, crc)
111 crc = do_crc(message, crc)
112 return message+'|'+('%04x'%crc)
115 self.wfh.write('PING\n')
116 (code, string) = self.get_response()
117 return (code == '000', code, string)
119 def vend(self, item):
120 if not re.search('^[0-9][0-9]$', item):
121 return (False, 'Invalid item requested (%s)'%item)
122 self.wfh.write(self.authed_message(('V%s'%item))+'\n')
123 (code, string) = self.get_response()
124 return (code == '100', code, string)
126 def beep(self, duration = None, synchronous = True):
128 if synchronous: msg += 'S'
130 if duration > 255: duration = 255
131 if duration < 1: duration = 1
132 msg += '%02x'%duration
133 self.wfh.write(msg+'\n')
134 (code, string) = self.get_response()
135 return (code == '500', code, string)
137 def silence(self, duration = None, synchronous = True):
139 if synchronous: msg += 'S'
141 if duration > 255: duration = 255
142 if duration < 1: duration = 1
143 msg += '%02x'%duration
144 self.wfh.write(msg+'\n')
145 (code, string) = self.get_response()
146 return (code == '501', code, string)
148 def display(self, string):
150 string = string[0:10]
151 string = re.sub('(.)\.', lambda match: '.'+match.group(1), string)
152 self.wfh.write('D'+string+'\n')
153 (code, string) = self.get_response()
154 return (code == '300', code, string)
156 def next_event(self, timeout = None):
157 # we don't want to buffer in the serial port, so we get all the events
159 if timeout < 0: timeout = 0
160 if len(self.events) > 0: timeout = 0
162 (r, _, _) = select([self.rfh], [], [], timeout)
164 self.get_response(async = True)
168 if len(self.events) == 0: return (TICK, time())