basic-logging.rb

#! /usr/bin/env ruby

require 'socket'

def log(source, message)
  time = Time.now.strftime("%Y-%m-%d %H:%M:%S")
  puts "[%s] %s => %s" % [time, source, message]
end

server = TCPServer.new ARGV.first.to_i

loop do
  client = server.accept
  info   = client.remote_address
  source = "%s:%s" % [info.ip_address, info.ip_port]

  log source, "Connection established"

  data = client.readline
  log source, "Client transmitted %d bytes" % data.bytes.count

  client.close
  log source, "Connection terminated"
end