Ruby TCPSocket request not getting response

Question

I have been reading up on TCPSockets over at TutorialsPoint and I need a simple client to make requests but I do not confused why there is no response.

Website API Login

The login command accepts a JSON object as argument followed by the EOT character for a response.

From the website's API

This is what I have

def connect
    url = "someurl.com"
    port = 19534 
    loginRequest = 'login {"protocol":1,"client":"testruby","clientver":0.1}' +"\04"

    s = TCPSocket.open(url,port)

    s.puts(loginRequest)
    while line = s.gets
        puts line.chop
    end
puts "end"
s.close
end
connect

My attempts

1) I run the ruby code in terminal but my connection to the server is immediately closed.

I'm totally clueless and would appreciate some directions on this.

Answer 1

It seems that the server is using raw TCP/IP, using the 0x04 character to signify an "End of Message".

Your code seems to prefer blocking IO (although it probably wouldn't be my first choice), so allow me to suggest a blocking API adjustment:

require 'socket'

module VNDB
   public

   def send_message message
      raise "Not connected" unless @s
      @s.write (message + "\x04")
   end

   def get_message
      raise "Not connected" unless @s
      message = ''
      message << @s.getc until message[-1] == "\x04"
      message
   end

   def connect
       url = "someurl.com"
       port = 19534 
       loginRequest = 'login {"protocol":1,"client":"testruby","clientver":0.1}' +"\04"

       @s = TCPSocket.open(url,port)

       send_message loginRequest
       puts get_message
       puts "end"
       @s.close
       @s = nil
   end
   extend self
end

VNDB.connect

PS

1. I couldn't test the code, because "someurl.com" isn't really the address, I guess.

2. The database server is NOT using Websockets (which is a name of a protocol), so please consider editing your question and removing that tag.