--- /dev/null
+# vim:ts=4
+import re
+from CRC import do_crc
+from select import select
+import socket, logging
+from time import time, sleep
+from MIFAREClient import MIFAREClient
+
+asynchronous_responses = [ '400', '401', # door open/closed
+ '610', # switches changed
+ '200', '201', '202', '203', '204', '205', '206',
+ '207', '208', '209', '211', # key presses
+ ]
+DOOR = 1
+SWITCH = 2
+KEY = 3
+TICK = 4
+MIFARE = 5
+
+class VendingException(Exception): pass
+
+class VendingMachine:
+ def __init__(self, rfh, wfh, use_mifare):
+ self.events = []
+ # Secret
+ self.secret = 'SN4CKZ0RZZZZZZZZ'
+ self.rfh = rfh
+ self.wfh = wfh
+ self.challenge = None
+ # Initialise ourselves into a known state
+ self.wfh.write('\n')
+ self.await_prompt()
+ self.wfh.write('echo off\n')
+ self.await_prompt()
+ self.wfh.write('PING\n')
+ code = ''
+ while code != '000':
+ code = self.get_response()[0]
+ self.get_switches()
+ if use_mifare:
+ self.mifare = MIFAREClient()
+ self.mifare_timeout = 0
+ else:
+ self.mifare = None
+
+ def await_prompt(self):
+ self.wfh.flush()
+ state = 1
+ timeout = 0.5
+ prefix = ''
+ s = ''
+ # mtearle - vending machine was dying wait for a response from
+ # the hardware, suspect it was missing characters
+ #
+ # fixed by migration to pyserial - but future good place to start
+ while True:
+ try:
+ s = self.rfh.read(1)
+ except socket.error:
+ raise VendingException('failed to read input from vending machine')
+ if s == '': raise VendingException('nothing read!')
+ if (s != '#' and s != '%') and state == 1: prefix += s
+ if s == '\n' or s == '\r':
+ state = 1
+ prefix = ''
+ if (s == '#' or s == '%') and state == 1: state = 2
+ if s == ' ' and state == 2:
+ if prefix == '':
+ self.challenge = None
+ return
+ if re.search('^[0-9a-fA-F]{4}$', prefix):
+ self.challenge = int(prefix, 16)
+ return
+
+ def get_response(self, async = False):
+ self.wfh.flush()
+ while True:
+ s = ''
+ while s == '':
+ s = self.rfh.readline()
+ if s == '':
+ raise VendingException('Input socket has closed!')
+ s = s.strip('\r\n')
+ code = s[0:3]
+ text = s[4:]
+ if code in asynchronous_responses:
+ self.handle_event(code, text)
+ if async: return None
+ else:
+ self.await_prompt()
+ return (code, text)
+
+ def get_switches(self):
+ self.wfh.write('S\n')
+ (code, text) = self.get_response()
+ if code != '600':
+ return (False, code, text)
+ self.interpret_switches(text)
+ return (True, code, text)
+
+ def interpret_switches(self, text):
+ self.switches = (int(text[0:2], 16) << 8) | int(text[3:5], 16)
+
+ def handle_event(self, code, text):
+ if code == '400':
+ self.events.append((DOOR, 1))
+ elif code == '401':
+ self.events.append((DOOR, 0))
+ elif code == '610':
+ # NOP this. Nothing handles this yet.
+ #self.events.append((SWITCH, None))
+ self.interpret_switches(text)
+ elif code[0] == '2':
+ self.events.append((KEY, int(code[1:3])))
+ else:
+ logging.warning('Unhandled event! (%s %s)\n'%(code,text))
+
+ def authed_message(self, message):
+ print 'self.challenge = %04x' % self.challenge
+ if self.challenge == None:
+ return message
+ crc = do_crc('%c%c'%(self.challenge >> 8, self.challenge & 0xff))
+ crc = do_crc(self.secret, crc)
+ crc = do_crc(message, crc)
+ print 'output = "%s|%04x"' % (message, crc)
+ return message+'|'+('%04x'%crc)
+
+ def ping(self):
+ self.wfh.write('PING\n')
+ (code, string) = self.get_response()
+ return (code == '000', code, string)
+
+ def vend(self, item):
+ if not re.search('^[0-9][0-9]$', item):
+ return (False, 'Invalid item requested (%s)'%item)
+ self.wfh.write(self.authed_message(('V%s'%item))+'\n')
+ (code, string) = self.get_response()
+ return (code == '100', code, string)
+
+ def beep(self, duration = None, synchronous = True):
+ msg = 'B'
+ if synchronous: msg += 'S'
+ if duration != None:
+ if duration > 255: duration = 255
+ if duration < 1: duration = 1
+ msg += '%02x'%duration
+ self.wfh.write(msg+'\n')
+ (code, string) = self.get_response()
+ return (code == '500', code, string)
+
+ def silence(self, duration = None, synchronous = True):
+ msg = 'C'
+ if synchronous: msg += 'S'
+ if duration != None:
+ if duration > 255: duration = 255
+ if duration < 1: duration = 1
+ msg += '%02x'%duration
+ self.wfh.write(msg+'\n')
+ (code, string) = self.get_response()
+ return (code == '501', code, string)
+
+ def display(self, string):
+ if len(string) > 10:
+ string = string[0:10]
+ string = re.sub('(.)\.', lambda match: '.'+match.group(1), string)
+ self.wfh.write('D'+string+'\n')
+ (code, string) = self.get_response()
+ return (code == '300', code, string)
+
+ def next_event(self, timeout = None):
+ # we don't want to buffer in the serial port, so we get all the events
+ # we can ASAP.
+
+ # Never have no timeout...
+ if timeout == None: timeout = 60*60*24*365
+
+ # Make sure we go through the loop at least once.
+ if timeout < 0: timeout = 0
+
+ while timeout >= 0:
+ this_timeout = min(timeout, 0.2)
+ timeout -= this_timeout
+
+ (r, _, _) = select([self.rfh], [], [], this_timeout)
+ if r:
+ self.get_response(async = True)
+ timeout = 0
+
+ if self.mifare:
+ now = time()
+ if now > self.mifare_timeout:
+ self.mifare_timeout = now + 0.5
+ mifare_uid = self.mifare.get_card_id()
+ if mifare_uid != None:
+ logging.info('Got MIFARE card id %s'%(repr(mifare_uid)))
+ self.events.append((MIFARE, mifare_uid))
+ timeout = 0
+ if timeout == 0:
+ break
+
+ if len(self.events) == 0: return (TICK, time())
+ ret = self.events[0]
+ del self.events[0]
+ return ret
git.ucc.asn.au / uccvend-vendserver.git / blobdiff
UCC git Repository :: git.ucc.asn.au