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#!/usr/bin/env python
#
# Bank client.
#
# The client searches the two banks and performs a set of operations.
# (the banks are searched simply by listing the :banks namespace!)
#
import sys
import Pyro.naming, Pyro.core
from banks import BankError
group = ':banks1' # the default namespace group
# A bank client.
class client(object):
def __init__(self,name):
self.name=name
def doBusiness(self, bank):
print
print '***',self.name,'is doing business with',bank.name(),':'
print 'Creating account'
try:
bank.createAccount(self.name)
except BankError,x:
print 'Failed:',x
print 'Removing account and trying again'
bank.deleteAccount(self.name)
bank.createAccount(self.name)
print 'Deposit money'
bank.deposit(self.name, 200.00)
print 'Deposit money'
bank.deposit(self.name, 500.75)
print 'Balance=', bank.balance(self.name)
print 'Withdraw money'
bank.withdraw(self.name, 400.00)
print 'Withdraw money (red)'
try:
bank.withdraw(self.name, 400.00)
except BankError,x:
print 'Failed:',x
print 'End balance=', bank.balance(self.name)
print 'Withdraw money from non-existing account'
try:
bank.withdraw('GOD',2222.22)
print '!!! Succeeded?!? That is an error'
except BankError,x:
print 'Failed, as expected:',x
print 'Deleting non-existing account'
try:
bank.deleteAccount('GOD')
print '!!! Succeeded?!? That is an error'
except BankError,x:
print 'Failed, as expected:',x
# initialize the client and set the default namespace group
Pyro.core.initClient()
Pyro.config.PYRO_NS_DEFAULTGROUP=group
# locate the NS
locator = Pyro.naming.NameServerLocator()
print 'Searching Naming Service...',
ns = locator.getNS()
print 'Naming Service found at',ns.URI.address,'('+(Pyro.protocol.getHostname(ns.URI.address) or '??')+') port',ns.URI.port
# List the banks.
# This is done by simply looking in the :banks namespace, to see what
# banks have registered. The filter is for removing any groups that could
# be in the namespace (the type of real names is 1).
banknames = filter(lambda x: x[1]==1, ns.list(group))
banknames = map(lambda (x,y): x, banknames) # keep only the object name
if not banknames:
raise RuntimeError('There are no banks to do business with!')
banks=[] # list of banks (proxies)
print
for name in banknames:
print 'Found a bank: ',name
try:
URI=ns.resolve(name)
except Pyro.core.PyroError,x:
print 'Bank can\'t be found:',x
raise SystemExit
# create a proxy for the bank object
bank = Pyro.core.getProxyForURI(URI)
banks.append(bank)
# Different clients
irmen = client('Irmen')
suzy = client('Suzy')
# Try the different banks
for bank in banks:
irmen.doBusiness(bank)
suzy.doBusiness(bank)
# List all accounts
print
for bank in banks:
print 'The accounts in the',bank.name(),':'
accounts = bank.allAccounts()
for name in accounts.keys():
print ' ',name,':',accounts[name]
# Pedantic cleanup
del irmen
del suzy
del banks
del ns
|
