From a71681be7c9cd03668d9eb5a61032702e15e7240 Mon Sep 17 00:00:00 2001
From: Bernard Blackham <dagobah@ucc.gu.uwa.edu.au>
Date: Fri, 25 Jun 2004 15:29:34 +0000
Subject: [PATCH] Most common functions

---
 sql-edition/servers/VendServer.py | 104 ++++++++++++++++++++++++++----
 1 file changed, 91 insertions(+), 13 deletions(-)

diff --git a/sql-edition/servers/VendServer.py b/sql-edition/servers/VendServer.py
index 9221a4d..c6a9416 100755
--- a/sql-edition/servers/VendServer.py
+++ b/sql-edition/servers/VendServer.py
@@ -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')
-- 
2.20.1