X-Git-Url: https://git.ucc.asn.au/?p=uccvend-vendserver.git;a=blobdiff_plain;f=sql-edition%2Fservers%2FVendingMachine.py;h=9fe524519e7666579c09245f6110fbcc0050fe24;hp=3046360fe9deb58424853d769cc581483d7a95de;hb=a1f84706e31c65738e52ee1405fa8e54f4e2407b;hpb=38b21b79dca47b875d3005a4708163d77664d223

diff --git a/sql-edition/servers/VendingMachine.py b/sql-edition/servers/VendingMachine.py
index 3046360..9fe5245 100644
--- a/sql-edition/servers/VendingMachine.py
+++ b/sql-edition/servers/VendingMachine.py
@@ -1,13 +1,22 @@
+# vim:ts=4
 import re
 from CRC import do_crc
-from binascii import unhexlify
+from select import select
 
 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
+
+class VendingException(Exception): pass
 
 class VendingMachine:
 	def __init__(self, rfh, wfh):
+		self.events = []
 		self.secret = 'AAAAAAAAAAAAAAAA'
 		self.rfh = rfh
 		self.wfh = wfh
@@ -20,7 +29,8 @@ class VendingMachine:
 		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):
 		self.wfh.flush()
@@ -28,8 +38,12 @@ class VendingMachine:
 		prefix = ''
 		s = ''
 		while True:
-			s = self.rfh.read(1)
-			if s == '': raise Exception
+			try:
+				s = self.rfh.read(1)
+			except socket.error:
+				print "Blah, seems DEC server has fallen over"
+				raise VendingException('failed to read input from vending machine')
+			if s == '': raise VendingException('nothing read!')
 			if s == '\n' or s == '\r':
 				state = 1
 				prefix = ''
@@ -39,10 +53,10 @@ class VendingMachine:
 					self.challenge = None
 					return
 				if re.search('^[0-9a-fA-F]{4}$', prefix):
-					self.challenge = unhexlify(prefix)
+					self.challenge = int(prefix, 16)
 					return
 
-	def get_response(self):
+	def get_response(self, async = False):
 		self.wfh.flush()
 		while True:
 			s = ''
@@ -54,12 +68,34 @@ class VendingMachine:
 			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):
-		pass
+		if code == '400':
+			self.events.append((DOOR, 0))
+		elif code == '401':
+			self.events.append((DOOR, 1))
+		elif code == '610':
+			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))
 
 	def authed_message(self, message):
 		if self.challenge == None:
@@ -79,7 +115,7 @@ class VendingMachine:
 			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)
+		return (code == '100', code, string)
 
 	def beep(self, duration = None, synchronous = True):
 		msg = 'B'
@@ -101,8 +137,7 @@ class VendingMachine:
 			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:
@@ -111,3 +146,18 @@ class VendingMachine:
 		(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.
+		if len(self.events) > 0: timeout = 0
+		while True:
+			(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