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#!/usr/bin/env ruby
#
#   Copyright 2006 LogicBlaze Inc.
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#
begin; require 'rubygems'; rescue; end
require 'stomp'

#
# This simple script is inspired by the netcat utility.  It allows you to receive
# data from a stomp destination and output it.
#
# Usage: stompcat (destination-name)
#
# Example: stompcat /topic/foo
#   Would display output that arrives at the /topic/foo stomp destination
#
begin

 if ARGV[0] == '-h' || ARGV[0] == '--help'
    $stdout.puts
    $stdout.puts 'Usage: stompcat DESTINATION'
    $stdout.puts
    $stdout.puts 'Receives data from a stomp destination and outputs it to STDOUT'
    $stdout.puts
    $stdout.puts 'Example: stompcat /topic/foo'
    $stdout.puts
    $stdout.puts 'Defaults:'
    $stdout.puts "DESTINATION\t/topic/default"
    $stdout.puts "STOMP_HOST\tlocalhost"
    $stdout.puts "STOMP_PORT\t61613"
    $stdout.puts "STOMP_USER\t"
    $stdout.puts "STOMP_PASSWORD\t"
    $stdout.puts
    $stdout.puts 'You can override the host, port, user, or password through environment variables'
    exit 0
  end

  @port = 61613
  @host = "localhost"
  @user = ENV["STOMP_USER"];
  @password = ENV["STOMP_PASSWORD"]

  @host = ENV["STOMP_HOST"] if ENV["STOMP_HOST"] != nil
  @port = ENV["STOMP_PORT"] if ENV["STOMP_PORT"] != nil

  @destination = "/topic/default"
  @destination = $*[0] if $*[0] != nil

  $stderr.print "Connecting to stomp://#{@host}:#{@port} as #{@user}\n"
  @conn = Stomp::Connection.open(@user, @password, @host, @port, true)
  $stderr.print "Getting output from #{@destination}\n"

  @conn.subscribe(@destination, { :ack =>"client" })
  while true
      @msg = @conn.receive
      $stdout.print @msg.body
      $stdout.flush
      @conn.ack @msg.headers["message-id"]
  end

rescue
end