/[anoncvs]/projects/dispense2/sql-edition/servers/VendingMachine.py


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Contents of /projects/dispense2/sql-edition/servers/VendingMachine.py

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Revision 1.21 - (show annotations) (download) (as text)
Fri Feb 29 13:25:50 2008 UTC (13 years, 3 months ago) by dagobah
Branch: MAIN
Changes since 1.20: +25 -6 lines
File MIME type: text/x-python
Work from tonight:
MIFARE integration.
Old DAA patches for balance showing.
Eat easter eggs.

1 # vim:ts=4
2 import re
3 from CRC import do_crc
4 from select import select
5 import socket, logging
6 from time import time, sleep
7 from MIFAREClient import MIFAREClient
8
9 asynchronous_responses = [ '400', '401', # door open/closed
10 '610', # switches changed
11 '200', '201', '202', '203', '204', '205', '206',
12 '207', '208', '209', '211', # key presses
13 ]
14 DOOR = 1
15 SWITCH = 2
16 KEY = 3
17 TICK = 4
18 MIFARE = 5
19
20 class VendingException(Exception): pass
21
22 class VendingMachine:
23 def __init__(self, rfh, wfh):
24 self.events = []
25 # Secret
26 self.secret = 'SN4CKZ0RZZZZZZZZ'
27 self.rfh = rfh
28 self.wfh = wfh
29 self.challenge = None
30 # Initialise ourselves into a known state
31 self.wfh.write('\n')
32 self.await_prompt()
33 self.wfh.write('echo off\n')
34 self.await_prompt()
35 self.wfh.write('PING\n')
36 code = ''
37 while code != '000':
38 code = self.get_response()[0]
39 self.get_switches()
40 self.mifare = MIFAREClient()
41
42 def await_prompt(self):
43 self.wfh.flush()
44 state = 1
45 timeout = 0.5
46 prefix = ''
47 s = ''
48 # mtearle - vending machine was dying wait for a response from
49 # the hardware, suspect it was missing characters
50 #
51 # fixed by migration to pyserial - but future good place to start
52 while True:
53 try:
54 s = self.rfh.read(1)
55 except socket.error:
56 raise VendingException('failed to read input from vending machine')
57 if s == '': raise VendingException('nothing read!')
58 if (s != '#' and s != '%') and state == 1: prefix += s
59 if s == '\n' or s == '\r':
60 state = 1
61 prefix = ''
62 if (s == '#' or s == '%') and state == 1: state = 2
63 if s == ' ' and state == 2:
64 if prefix == '':
65 self.challenge = None
66 return
67 if re.search('^[0-9a-fA-F]{4}$', prefix):
68 self.challenge = int(prefix, 16)
69 return
70
71 def get_response(self, async = False):
72 self.wfh.flush()
73 while True:
74 s = ''
75 while s == '':
76 s = self.rfh.readline()
77 if s == '':
78 raise VendingException('Input socket has closed!')
79 s = s.strip('\r\n')
80 code = s[0:3]
81 text = s[4:]
82 if code in asynchronous_responses:
83 self.handle_event(code, text)
84 if async: return None
85 else:
86 self.await_prompt()
87 return (code, text)
88
89 def get_switches(self):
90 self.wfh.write('S\n')
91 (code, text) = self.get_response()
92 if code != '600':
93 return (False, code, text)
94 self.interpret_switches(text)
95 return (True, code, text)
96
97 def interpret_switches(self, text):
98 self.switches = (int(text[0:2], 16) << 8) | int(text[3:5], 16)
99
100 def handle_event(self, code, text):
101 if code == '400':
102 self.events.append((DOOR, 1))
103 elif code == '401':
104 self.events.append((DOOR, 0))
105 elif code == '610':
106 # NOP this. Nothing handles this yet.
107 #self.events.append((SWITCH, None))
108 self.interpret_switches(text)
109 elif code[0] == '2':
110 self.events.append((KEY, int(code[1:3])))
111 else:
112 logging.warning('Unhandled event! (%s %s)\n'%(code,text))
113
114 def authed_message(self, message):
115 if self.challenge == None:
116 return message
117 crc = do_crc('%c%c'%(self.challenge >> 8, self.challenge & 0xff))
118 crc = do_crc(self.secret, crc)
119 crc = do_crc(message, crc)
120 return message+'|'+('%04x'%crc)
121
122 def ping(self):
123 self.wfh.write('PING\n')
124 (code, string) = self.get_response()
125 return (code == '000', code, string)
126
127 def vend(self, item):
128 if not re.search('^[0-9][0-9]$', item):
129 return (False, 'Invalid item requested (%s)'%item)
130 self.wfh.write(self.authed_message(('V%s'%item))+'\n')
131 (code, string) = self.get_response()
132 return (code == '100', code, string)
133
134 def beep(self, duration = None, synchronous = True):
135 msg = 'B'
136 if synchronous: msg += 'S'
137 if duration != None:
138 if duration > 255: duration = 255
139 if duration < 1: duration = 1
140 msg += '%02x'%duration
141 self.wfh.write(msg+'\n')
142 (code, string) = self.get_response()
143 return (code == '500', code, string)
144
145 def silence(self, duration = None, synchronous = True):
146 msg = 'C'
147 if synchronous: msg += 'S'
148 if duration != None:
149 if duration > 255: duration = 255
150 if duration < 1: duration = 1
151 msg += '%02x'%duration
152 self.wfh.write(msg+'\n')
153 (code, string) = self.get_response()
154 return (code == '501', code, string)
155
156 def display(self, string):
157 if len(string) > 10:
158 string = string[0:10]
159 string = re.sub('(.)\.', lambda match: '.'+match.group(1), string)
160 self.wfh.write('D'+string+'\n')
161 (code, string) = self.get_response()
162 return (code == '300', code, string)
163
164 def next_event(self, timeout = None):
165 # we don't want to buffer in the serial port, so we get all the events
166 # we can ASAP.
167
168 # Never have no timeout...
169 if timeout == None: timeout = 60*60*24*365
170
171 # Make sure we go through the loop at least once.
172 if timeout <= 0: timeout = 0.01
173
174 while timeout > 0:
175 this_timeout = min(timeout, 0.2)
176 timeout -= this_timeout
177
178 (r, _, _) = select([self.rfh], [], [], this_timeout)
179 if r:
180 self.get_response(async = True)
181 timeout = 0
182
183 try:
184 mifare_uid = self.mifare.get_card_uid()
185 except ValueError:
186 mifare_uid = None
187 if mifare_uid != None:
188 logging.info('Got MIFARE uid %s'%(str(mifare_uid)))
189 self.events.append((MIFARE, mifare_uid))
190 timeout = 0
191
192 if len(self.events) == 0: return (TICK, time())
193 ret = self.events[0]
194 del self.events[0]
195 return ret

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