Class: PostalCodeLookup

Inherits:
Object
  • Object
show all
Includes:
HTTParty
Defined in:
lib/postal_code_lookup.rb

Defined Under Namespace

Classes: ServiceException

Instance Method Summary collapse

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/postal_code_lookup.rb', line 15

def call(env)
  request = Rack::Request.new(env)

  headers = { "Content-Type" => "application/json" }
  begin
    response = Rack::Response.new(find(request.params['code']), 200, headers)
    response = maybe_cache_response(response)
  rescue Exception => e
    response = Rack::Response.new({ :error => e.message }.to_json, 500, headers)
  end

  response.to_a
end

#find(code) ⇒ Object 



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# File 'lib/postal_code_lookup.rb', line 29

def find(code)
  result = PostalCodeLookup.get('/cgi-bin/postalcode/postalcode.cgi', { :query => { :code => code } })

  if error = result["ServiceExceptionReport"]
    raise ServiceException.new(error['ServiceException'])
  else
    postal_code = result['PostalCodeLookup']['PostalCodeResultSet']['PostalCode']
    location = postal_code["gml:centerOf"]["gml:Point"]
    epsg = location["srsName"].split('#').pop
    lng, lat = location["gml:coordinates"].split(',')
    return {
      :postal_code => postal_code["gml:name"],
      :epsg => epsg.to_i,
      :srs_name => location["srsName"],
      :latitude => lat.to_f,
      :longitude => lng.to_f,
      :placename => postal_code["Placename"],
      :province_or_territory => postal_code["ProvinceOrTerritory"]
    }.to_json
  end
end

#maybe_cache_response(response) ⇒ Object 



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# File 'lib/postal_code_lookup.rb', line 51

def maybe_cache_response(response)
  begin
    # using rack cache
    cached_response = Rack::Cache::Response.new(response.status, response.headers, response.body)
    cached_response.max_age = 1.month
    cached_response
  rescue
    response # just return the original response
  end
end