Unusual behavior of Ruby script while working with sockets

Question

The thing is that I am very beginner in Ruby programming and I have some troubles with understanding Ruby's behavior.

Here is the code:

require 'socket'

server = TCPServer.new 2000
loop do
  Thread.start(server.accept) do |client|

    puts 'Client connected: ' + client.gets

    line = "-1"

    while (line != "/close ")
      line = client.gets();
      puts line
    end

    puts 'client closed'
    client.close
  end
end

As you see, it's a simple socket server waiting for some input information. The problem is that when it gets "/close ", it exits the while loop, but never goes to puts 'client closed' and client.close. So why is it so, or what am I doing wrong?

Answer 1

I suspect that if you change puts line to puts line.inspect you will see the problem.

---

Found it? gets reads by lines, which includes the line-terminating \n, so no line you get will ever equal "/close ". Changing the comparison to use line.strip will work, for example.