em-http-request streaming upload

em_http.rb

#
# requires:
#   a) run https://gist.github.com/2022231 on localhost:3001
#   b) provide a streamed.jpg at script location
#
# result:
#   this fails for em-http-request v1.0.1
#

require "rubygems"
require "em-synchrony"
require "em-http"

require "launchy"

@target_host = "localhost"
@target_port = "3001"
@target_path = "/"
@source_image_name = "streamed.jpg"
@result_html_name = "result_em_http.html"

def script_data_path(filename)
  File.join(File.expand_path(File.dirname(__FILE__)), filename)
end

EM.run do

  file_path = script_data_path(@source_image_name)

  puts "Uploading #{File.size(file_path)} bytes..."

  # Content-Length is calculated internally and cannot be overridden
  request_headers = {"Content-Type" => "image/jpeg", "Accept" => "*/*"}

  http = EventMachine::HttpRequest.new("http://#{@target_host}:#{@target_port}").post(
    :path => @target_path, :head => request_headers, :file => file_path)

  http.callback do |a_http|
    puts "DONE: #{a_http.response_header.status}\n"+
      "BODY: #{a_http.response.size} bytes\n"+
      "See #{@result_html_name}"

    result_html_path = script_data_path(@result_html_name)

    File.open(result_html_path, "w") do |f|
      f.puts(a_http.response)
    end

    Launchy.open("file://#{result_html_path}")
    EM.stop
  end

end