Remove redundant code associated with Bernard Postgres Dispense prototype

VendServer/VendServer.py

 #!/usr/bin/python
 # vim:ts=4
 
-USE_DB = 0
 USE_MIFARE = 1
 
 import ConfigParser
 import sys, os, string, re, pwd, signal, math, syslog
 import logging, logging.handlers
 from traceback import format_tb
-if USE_DB: import pg
 from time import time, sleep, mktime, localtime
 from subprocess import Popen, PIPE
 from LATClient import LATClient, LATClientException
@@ -95,36 +93,6 @@ class VendConfigFile:
 		except ConfigParser.Error, e:
 			raise SystemExit("Error reading config file "+config_file+": " + str(e))
 
-class DispenseDatabaseException(Exception): pass
-
-class DispenseDatabase:
-	def __init__(self, vending_machine, host, name, user, password):
-		self.vending_machine = vending_machine
-		self.db = pg.DB(dbname = name, host = host, user = user, passwd = password)
-		self.db.query('LISTEN vend_requests')
-
-	def process_requests(self):
-		logging.debug('database processing')
-		query = 'SELECT request_id, request_slot FROM vend_requests WHERE request_handled = false'
-		try:
-			outstanding = self.db.query(query).getresult()
-		except (pg.error,), db_err:
-			raise DispenseDatabaseException('Failed to query database: %s\n'%(db_err.strip()))
-		for (id, slot) in outstanding:
-			(worked, code, string) = self.vending_machine.vend(slot)
-			logging.debug (str((worked, code, string)))
-			if worked:
-				query = 'SELECT vend_success(%s)'%id
-				self.db.query(query).getresult()
-			else:
-				query = 'SELECT vend_failed(%s)'%id
-				self.db.query(query).getresult()
-
-	def handle_events(self):
-		notifier = self.db.getnotify()
-		while notifier is not None:
-			self.process_requests()
-			notify = self.db.getnotify()
 """
 This class manages the current state of the vending machine.
 """
@@ -927,18 +895,10 @@ class VendServer():
 
 		logging.debug('PING is ' + str(self.v.ping()))
 
-		if USE_DB: db = DispenseDatabase(v, cf.DBServer, cf.DBName, cf.DBUser, cf.DBPassword)
-
 		self.setup_idlers()
 		self.reset_idler()
 
 		while True:
-			if USE_DB:
-				try:
-					db.handle_events()
-				except DispenseDatabaseException, e:
-					logging.error('Database error: '+str(e))
-
 			timeout = self.time_to_next_update()
 			(event, params) = self.v.next_event(timeout)
 			self.run_handler(event, params)