doc/core/howto/listings/pb/pbAnonClient.py

   1 #!/usr/bin/env python
   2
   3 # Copyright (c) Twisted Matrix Laboratories.
   4 # See LICENSE for details.
   5
   6 """
   7 Client which will talk to the server run by pbAnonServer.py, logging in
   8 either anonymously or with username/password credentials.
   9 """
  10
  11 from sys import stdout
  12
  13 from twisted.python.log import err, startLogging
  14 from twisted.cred.credentials import Anonymous, UsernamePassword
  15 from twisted.internet import reactor
  16 from twisted.internet.defer import gatherResults
  17 from twisted.spread.pb import PBClientFactory
  18
  19
  20 def error(why, msg):
  21     """
  22     Catch-all errback which simply logs the failure.  This isn't expected to
  23     be invoked in the normal case for this example.
  24     """
  25     err(why, msg)
  26
  27
  28 def connected(perspective):
  29     """
  30     Login callback which invokes the remote "foo" method on the perspective
  31     which the server returned.
  32     """
  33     print "got perspective1 ref:", perspective
  34     print "asking it to foo(13)"
  35     return perspective.callRemote("foo", 13)
  36
  37
  38 def finished(ignored):
  39     """
  40     Callback invoked when both logins and method calls have finished to shut
  41     down the reactor so the example exits.
  42     """
  43     reactor.stop()
  44
  45
  46 def main():
  47     """
  48     Connect to a PB server running on port 8800 on localhost and log in to
  49     it, both anonymously and using a username/password it will recognize.
  50     """
  51     startLogging(stdout)
  52     factory = PBClientFactory()
  53     reactor.connectTCP("localhost", 8800, factory)
  54
  55     anonymousLogin = factory.login(Anonymous())
  56     anonymousLogin.addCallback(connected)
  57     anonymousLogin.addErrback(error, "Anonymous login failed")
  58
  59     usernameLogin = factory.login(UsernamePassword("user1", "pass1"))
  60     usernameLogin.addCallback(connected)
  61     usernameLogin.addErrback(error, "Username/password login failed")
  62
  63     bothDeferreds = gatherResults([anonymousLogin, usernameLogin])
  64     bothDeferreds.addCallback(finished)
  65
  66     reactor.run()
  67
  68
  69 if __name__ == '__main__':
  70     main()