From: Michael Furmaniuk <mfurmaniuk@...>
Date: 2009-03-07T01:19:02+09:00
Subject: Question about GServe and IO

I'm trying to make just a pass through TCP server, utilizing GServer and
some example code I am able to make something that starts up, lets me
connect multiple Clients and see what is happening.  Now I want to be
able to handle data depending on the string I get, the pass should also
respond to some simple commands and return data back to the Client.  But
I am getting some odd behavior on the Client when I send data, it seems
to be a step behind.  What I have so far is a simple Gserver, the port I
want to be constant and ARGV[0] is basically the local hostname I want
to run on.

require 'gserver'
port = 3472
host = ARGV[0]

class TestController < GServer
    def initialize(port, host)
        super(port, host)
    end

    def serve(io)
        @data_mode = false
        loop do
            if IO.select([io],nil,nil,5)
                data = io.readpartial(4096)
                op = handle_client(data,io)
                io.puts op
            end
            break if io.closed?
        end
        io.close
    end

    def handle_client(line,io)
        if line =~ /^time/
            show_time(io)
        elsif line =~ /^agents/
            display_agents(io)
        elsif line =~ /^help/
            show_help(io)
        elsif line =~ /^shutdown/
            io.puts "You don't want to do that Dave."
            self.stop
        elsif line =~ /^stop/
            stop_test(io)
        elsif line =~ /^HELO/
            io.puts "ACK"
        else
            io.puts "Command not understood."
        end
    end

This basically checks the data string and then routes off depending on
what I am sending in from the client...either show time on the GServer,
display some help info or return an ACK if it receives a HELO; pretty
much basic stuff to understand it all.  When I put some commands in I
get "Command not understood" then on the next input from the client I
get my previous command, so I see on the client:

> time
Fri Mar 06 11:13:54 200
> help
nil
> <pressed ENTER>
This is the help function.

nil
> agents
Command not understood.
nil
>
If there was a way to display agents it would be here.
nil
> HELO
Command not understood.
nil
>
ACK
nil

Am I not flushing something right on the Client, or is this in how the
IO is being handled on the GServer?

The Client is set up to send like this:

        loop do
            STDOUT.print '> '
            STDOUT.flush
            local = STDIN.gets
            break if !local
            s.puts(local)
            s.flush
            # Print out servers response
            response = s.readpartial(4096)
            puts(response.chop)
        end

I'm still new to this, so I apologize if its kind of basic I couldn't
understand what is going on or find something that describes a similar
problem in the forum.

Thanks!
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