X-Git-Url: https://git.ucc.asn.au/?p=zanchey%2Fdispense2.git;a=blobdiff_plain;f=sql-edition%2Fservers%2FVendingMachine.py;h=9506daf0599b8c2d0b44697c32e2c6466ea98f87;hp=edc593c7844e40738d5fc547aba43bef2eb0765f;hb=482573e7c8afad56f1c8ca0464a6cf9ac3e267f4;hpb=b89bdb9ca959326160ab5214ce8fcc308241baa4

diff --git a/sql-edition/servers/VendingMachine.py b/sql-edition/servers/VendingMachine.py
index edc593c..9506daf 100644
--- a/sql-edition/servers/VendingMachine.py
+++ b/sql-edition/servers/VendingMachine.py
@@ -2,6 +2,7 @@
 import re
 from CRC import do_crc
 from select import select
+import socket
 
 asynchronous_responses = [	'400', '401', # door open/closed
 				'610',        # switches changed
@@ -12,6 +13,8 @@ DOOR = 1
 SWITCH = 2
 KEY = 3
 
+class VendingException(Exception): pass
+
 class VendingMachine:
 	def __init__(self, rfh, wfh):
 		self.events = []
@@ -27,7 +30,7 @@ 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):
@@ -36,8 +39,12 @@ class VendingMachine:
 		prefix = ''
 		s = ''
 		while True:
-			s = self.rfh.read(1)
-			if s == '': raise Exception('nothing read!')
+			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 = ''
@@ -56,7 +63,8 @@ class VendingMachine:
 			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:]