You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: find_port.rb
    path of file: ./repos/metasploit-framework/lib/msf/core/handler
    
    the code of the file until where you have to start completion: # -*- coding: binary -*-
module Msf
module Handler

###
#
# This handlers implements port-based findsock handling.
#
###
module FindPort

  include Msf::Handler

  #
  # Returns the string representation of the handler type, in this case
  # 'find_port'.
  #
  def self.handler_type
   
    
  def create_session(sock, opts={})
    go = true

    # Give the payload a chance to run
    Rex::ThreadSafe.sleep(1.5)

    # This is a hack.  If the session is a shell, we check to see if it's
    # functional by sending an echo which tells us whether or not we're good
    # to go.
    if (self.session and self.session.type == 'shell')
      go = _check_shell(sock)
    else
      print_status("Trying to use connection...")
    end