CODEWITHSUNDEEP
javascriptnode.jscoffeescript
joe
joe

Reputation: 25

client and server in same nodejs process

Trying to create an echo server test with both client and server in the same node process. This code works if I split it into 2 files (server and client) but it does not work if combined into 1 file. How can I get it to work inside 1 file?

var HOST, createServer, g, net;

net = require("net");

HOST = "127.0.0.1";

createServer = function(port) {
  net.createServer(function(sock) {
    sock.write("welcome!  on port " + port + "\r\n");
    console.log("CONNECTED: " + sock.remoteAddress + ":" + sock.remotePort);
    while (true) {
      sock.write("hello\r\n");
    }
  }).listen(port, HOST);
  console.log("server listening on " + port);
};

createServer(7001);

g = net.createConnection(7001, HOST);

g.on("data", function(data) {
  console.log("got " + data);
});

and same in coffeescript:

net = require "net"
HOST = "127.0.0.1"

createServer = (port) ->
  net.createServer((sock) ->
    sock.write("welcome!  on port #{port}\r\n")
    console.log("CONNECTED: #{sock.remoteAddress}:#{sock.remotePort}")
    while true # this is the work queue, what ports to send to...                
      sock.write "hello\r\n"
    return
  ).listen port, HOST
  console.log "server listening on #{port}"
  return

createServer(7001)

# XXX why does g.on "data" never fire?                                           
# this works fine if I move it into                                              
# it's own file, how to co-exist                                                 
# this client with server above                                                  
# in same file?                                                                  
g = net.createConnection(7001, HOST)
g.on "data", (data) ->
  console.log "got #{data}"
  return

Upvotes: 1

Views: 167

Answers (1)

bardzusny
bardzusny

Reputation: 3838

while (true) {
  sock.write("hello\r\n");
}

This is your problem. You're writing to the stream indefinitely; and if it never ends, it won't trigger your "data" event. To illustrate more clearly, try this (in the place of the code above):

while (true) {
  console.log("hello!");
  sock.write("hello\r\n");
}

Or:

var i = 0;
while (i < 5) {
  i++;
  sock.write("hello\r\n");
}

EDIT: To keep echoing indefinitely, perhaps try something like this:

net.createServer(function(sock) { 
  sock.write("welcome!  on port " + port + "\r\n");
  console.log("CONNECTED: " + sock.remoteAddress + ":" + sock.remotePort);
  setInterval(function() {
    sock.write("hello\r\n");
  }, 2000);
}).listen(port, HOST);

Upvotes: 1

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