-import re, pg
+# vim:ts=4
+import re
from CRC import do_crc
from select import select
+import socket, logging
asynchronous_responses = [ '400', '401', # door open/closed
'610', # switches changed
SWITCH = 2
KEY = 3
+class VendingException(Exception): pass
+
class VendingMachine:
def __init__(self, rfh, wfh):
self.events = []
self.wfh.write('PING\n')
code = ''
while code != '000':
- (code, _) = self.get_response()
+ code = self.get_response()[0]
self.get_switches()
def await_prompt(self):
prefix = ''
s = ''
while True:
- s = self.rfh.read(1)
- if s == '': raise Exception('nothing read!')
+ 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 = ''
s = ''
while s == '':
s = self.rfh.readline()
- if s == '': return None
+ if s == '':
+ raise VendingException('Input socket has closed!')
s = s.strip('\r\n')
code = s[0:3]
text = s[4:]
def handle_event(self, code, text):
if code == '400':
- self.events.append((DOOR, 0))
- elif code == '401':
self.events.append((DOOR, 1))
+ elif code == '401':
+ self.events.append((DOOR, 0))
elif code == '610':
- self.events_append((SWITCH, None))
+ self.events.append((SWITCH, None))
self.interpret_switches(text)
elif code[0] == '2':
self.events.append((KEY, int(code[1:3])))
else:
- sys.stderr.write('WARNING: Unhandled event! (%s %s)\n'%(code,text))
+ logging.warning('Unhandled event! (%s %s)\n'%(code,text))
def authed_message(self, message):
if self.challenge == None:
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'))
+ self.wfh.write(self.authed_message(('V%s'%item))+'\n')
(code, string) = self.get_response()
return (code == '100', code, string)
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)
+ 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):
- if len(self.events) > 0:
- ret = self.events[0]
- del self.events[0]
- return ret
- return None
-
- def wait_for_events(self, timeout = None):
- if self.events: return True
- (r, _, _) = select([self.rfh], [], [], timeout)
- if not r: return False
- event_added = False
+ 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.
+ if len(self.events) > 0: timeout = 0
while True:
- self.get_response(async = True)
- (r, _, _) = select([self.rfh], [], [], 0)
- if not r: return event_added
+ (r, _, _) = select([self.rfh], [], [], timeout)
+ if r:
+ self.get_response(async = True)
+ timeout = 0
+ else:
+ break
+ if len(self.events) == 0: return None
+ ret = self.events[0]
+ del self.events[0]
+ return ret