Chat server sample

The following sample code implements a very simple chat server. A chat client may connect to the chat server, who is listening on port number 1234. The server responds with a welcome message and waits for one line of input from the client. The client types some text and transmits it to the server who displays the text and lets the user at the server computer type a line of text, which the client computer again displays. This goes back and forth until either the server or the client computer types the word "bye".

function chatServer() {
   var tcp = new Socket;
   // listen on port 1234
   writeln ("Chat server listening on port 1234");
   if (tcp.listen (1234)) {
      for (;;) {
         // poll for a new connection
         var connection = tcp.poll();
         if (connection != null) {
            writeln ("Connection from " + connection.host);
            // we have a new connection, so welcome and chat
            // until client terminates the session
            connection.writeln ("Welcome to a little chat!");
            chat (connection);
            connection.writeln ("*** Goodbye ***");
            connection.close();
            delete connection;
            writeln ("Connection closed");
         }
      }
   }
}
function chatClient() {
   var connection = new Socket;
   // connect to sample server
   if (connection.open ("remote-pc.corp.adobe.com:1234")) {
      // then chat with server
      chat (connection);
      connection.close();
      delete connection;
   }
}
function chat (c) {
   // select a long timeout
   c.timeout=1000;
   while (true) {
      // get one line and echo it
      writeln (c.read());
      // stop if the connection is broken
      if (!c.connected)
         break;
      // read a line of text
      write ("chat: ");
      var text = readln();
      if (text == "bye")
         // stop conversation if the user entered "bye"
         break;
      else
         // otherwise transmit to server
         c.writeln (text);
   }
}