Minimum code for EPCIS repository simple query interface

minimum_simple_query.rb

#!/usr/bin/env ruby
require 'nokogiri'
require 'optparse'
require 'net/http'
require 'uri'

@opts = { query_url: "http://127.0.0.1:3000/epcis/query",
          query_type: "SimpleEventQuery" }

ARGV.options do |o|
  o.banner = "#{$0} [options] [type:param]"
  o.separator "Options:"
  o.on("-Q", "--query_url url", "Destination URL for query") {|url| @opts[:query_url] = url }
  o.parse!
end

query_params = {}
ARGV.each {|a| query_params[$1] = $2 if a =~ /^([^:]+):(.*)/ }

def body_build(xml, query_type, query_params)
  xml.queryName query_type
  xml.params {
    query_params.map do |type, value|
      xml.param {
        xml.name type
        xml.value value
      }
    end
  }
end

QUERY_NAMESPACES = {
  'xmlns:epcisq' => 'urn:epcglobal:epcis-query:xsd:1'
}

builder = Nokogiri::XML::Builder.new do |xml|
  xml['epcisq'].Poll(QUERY_NAMESPACES) {
    body_build(xml, @opts[:query_type], query_params)
  }
end

body = builder.to_xml
uri = URI.parse(@opts[:query_url])
http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Post.new(uri.request_uri)
request["Content-Type"] = 'text/xml'
request["Accept"] = '*/*'

request.body = body
response = http.request(request)

if response.code.to_i == 200
  puts response.body
else
  puts response.code
end