Most common functions
authorBernard Blackham <dagobah@ucc.gu.uwa.edu.au>
Fri, 25 Jun 2004 15:29:34 +0000 (15:29 +0000)
committerBernard Blackham <dagobah@ucc.gu.uwa.edu.au>
Fri, 25 Jun 2004 15:29:34 +0000 (15:29 +0000)
sql-edition/servers/VendServer.py

index 9221a4d..c6a9416 100755 (executable)
@@ -1,9 +1,11 @@
 #!/usr/bin/python
 
-import sys, os, string, socket, time
+import sys, os, string, socket, time, re
 from popen2 import popen2
 from pyPgSQL import PgSQL
 from LATClient import LATClient
+from CRC import do_crc
+from binascii import unhexlify
 
 asynchronous_responses = [     '400', '401', # door open/closed
                                                        '610',        # switches changed
@@ -11,40 +13,116 @@ asynchronous_responses = [ '400', '401', # door open/closed
 
 class VendingMachine:
        def __init__(self, rfh, wfh):
+               self.secret = 'AAAAAAAAAAAAAAAA'
                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()
 
        def await_prompt(self):
                self.wfh.flush()
-               state = 0
+               state = 1
+               prefix = ''
                s = ''
-               while state != 3:
+               while True:
                        s = self.rfh.read(1)
                        if s == '': raise Exception
-                       if s == '\n' and state == 0: state = 1
+                       if s == '\n' or s == '\r':
+                               state = 1
+                               prefix = ''
                        if (s == '#' or s == '%') and state == 1: state = 2
-                       if s == ' ' and state == 2: state = 3
+                       if s == ' ' and state == 2:
+                               if prefix == '':
+                                       self.challenge = None
+                                       return
+                               if re.search('^[0-9a-fA-F]{4}$', prefix):
+                                       self.challenge = unhexlify(prefix)
+                                       return
 
        def get_response(self):
                self.wfh.flush()
-               s = ''
-               while s == '':
-                       s = self.rfh.readline()
-                       if s == '': return None
-                       s = s.strip('\r\n')
-               return (s[0:3], s[4:])
+               while True:
+                       s = ''
+                       while s == '':
+                               s = self.rfh.readline()
+                               if s == '': return None
+                               s = s.strip('\r\n')
+                       code = s[0:3]
+                       text = s[4:]
+                       if code in asynchronous_responses:
+                               self.handle_event(code, text)
+                       else:
+                               self.await_prompt()
+                               return (code, text)
+
+       def handle_event(self, code, text):
+               pass
+
+       def authed_message(self, message):
+               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)
+               return message+'|'+('%04x'%crc)
 
        def ping(self):
                self.wfh.write('PING\n')
                (code, string) = self.get_response()
-               return code == '000'
+               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\n'%item)+'\n'))
+               (code, string) = self.get_response()
+               return (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()
+               # FIXME: workaround a bug in rom W. should be just: return (code == '500', code, string)
+               return (code == '500' or code == '501', code, string)
+
+       def display(self, string):
+               if len(string) > 10:
+                       string = string[0:10]
+               self.wfh.write('D'+string+'\n')
+               (code, string) = self.get_response()
+               return (code == '300', code, string)
 
 if __name__ == '__main__':
        # Open vending machine via LAT
        latclient = LATClient(service = 'VEND', password = 'dmscptd')
        (rfh, wfh) = latclient.get_fh()
        v = VendingMachine(rfh, wfh)
-       print v.ping()
+       print 'PING is', v.ping()
+       print 'BEEP is', v.beep()
+       print 'VEND 11 is', v.vend('11')
+       print 'SILENCE is', v.silence()
+       print 'DISPLAY is', v.display('GOOD NIGHT')

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