SocketServer class - basis problem

Collapse
This topic is closed.
X
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • lebo
    #1

    SocketServer class - basis problem

    So I'm new to this python stuff - and this has me stumped

    # server
    import SocketServer

    PORT = 8037

    class myRequestHandle r(SocketServer. StreamRequestHa ndler):
    def handle(self):
    self.input = self.rfile.read (1024)
    print self.input
    self.wfile.writ e("blah")

    server = SocketServer.TC PServer(("", PORT), myRequestHandle r)
    print "listening on port", PORT
    server.serve_fo rever()

    # client
    import socket

    HOST = socket.gethostn ame()
    PORT = 8037

    s = socket.socket(s ocket.AF_INET, socket.SOCK_STR EAM)
    s.connect((HOST , PORT))
    s.send('Hello, world')

    # Fails
    data = s.recv(1024)

    s.close()
    print 'Received', data

    Why does s.recv() hang the client? It seems like server is not
    handing back "blah", but I'm sure it is.....this should be
    easy...(sigh)
    Tags: None
    • Miki Tebeka
      #2
      Re: SocketServer class - basis problem

      Hello, Leonard,
      [color=blue]
      > data = s.recv(1024)
      > s.close()
      > print 'Received', data
      >
      > Why does s.recv() hang the client? It seems like server is not
      > handing back "blah", but I'm sure it is.....[/color]
      I think that the socket buffer is not full (since you are waiting for
      1024 and "blah" is not enough).
      [color=blue]
      > this should be easy...(sigh)[/color]
      If it was that easy it won't be interesting ;-)

      Have a look at http://www.amk.ca/python/howto/sockets/

      HTH.
      Miki

        Comment

        • Byron Morgan
          #3
          Re: SocketServer class - basis problem

          "Miki Tebeka" <tebeka@cs.bgu. ac.il> wrote in message
          news:33803989.0 306232125.1cd45 6c2@posting.goo gle.com...[color=blue]
          >
          > Have a look at http://www.amk.ca/python/howto/sockets/
          >
          > HTH.
          > Miki[/color]

          And then check out
          http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/200946



            Comment

            • Steve Holden
              #4
              Re: SocketServer class - basis problem

              "lebo" <leonardbocock@ yahoo.com> wrote in message
              news:63701d2f.0 306231709.7990d 916@posting.goo gle.com...[color=blue]
              > So I'm new to this python stuff - and this has me stumped
              >[/color]
              [sample code][color=blue]
              >
              > Why does s.recv() hang the client? It seems like server is not
              > handing back "blah", but I'm sure it is.....this should be
              > easy...(sigh)[/color]

              <gratuitous self-advertisement>
              If you're going to OSCON you might like to sign up for the Python Network
              Programming tutorial - see
              Conferences - O'Reilly Media
              http://conferences.oreillynet.com/cs/os2003/view/e_sess/4165
              Transforming our in-person events to online


              This tutorial is intended to help network programming beginners to write
              their own networking code.
              </gratuitous self-advertisement>

              regards
              --
              Steve Holden http://www.holdenweb.com/
              Python Web Programming http://pydish.holdenweb.com/pwp/



                Comment

                • Peter Hansen
                  #5
                  Re: SocketServer class - basis problem

                  Miki Tebeka wrote:[color=blue]
                  >
                  > Hello, Leonard,
                  >[color=green]
                  > > data = s.recv(1024)
                  > > s.close()
                  > > print 'Received', data
                  > >
                  > > Why does s.recv() hang the client? It seems like server is not
                  > > handing back "blah", but I'm sure it is.....[/color][/color]
                  [color=blue]
                  > I think that the socket buffer is not full (since you are waiting for
                  > 1024 and "blah" is not enough).[/color]

                  This is not how the size parameter to recv() is used. It is a
                  *maximum*, meaning any amount of data from zero bytes (if the
                  socket is closed) to that value will be returned, with *no*
                  guarantees how much is actually returned. Often, but absolutely
                  not always, you will get a whole "line" and newbies will be
                  deceived into thinking it's enough just to recv(1024) and
                  carry on, but eventually such code will fail.

                  -Peter

                    Comment

                    Previous template Next
                    Working...