Erik A. Hanson » Ruby

SeleniumQuery

Erik — Mon, 24 May 2010 04:49:46 +0000

I wrote a tiny library to make Selenium testing in Ruby a little easier by helping you easily build a jQuery string that can be executed in the browser during a test.

This:

# this is ruby
jquery = SeleniumQuery.new(selenium)
id = jquery.find("td:nth(5).user:visible").closest("tr").attr!("id")

executes this in the browser:

// this is Javascript
selenium
  .browserbot
  .getCurrentWindow()
  .jQuery(selenium.browserbot.getCurrentWindow().document)
  .find("td:nth(5).user:visible")
  .closest("tr")
  .attr("id");

Check it out here: http://github.com/eahanson/seleniumquery

A Ruby Client for Angular

Erik — Fri, 20 Nov 2009 04:29:08 +0000

Here’s a little Ruby client for storing data in Angular, a system for creating simple database-backed web apps extremely easily.

#!/usr/bin/ruby

require 'rubygems'
require 'httpclient'
require 'json'

class Angular
  def initialize(username, password, library)
    @http = HTTPClient.new
    @library = library
    post("/login", :email => username, :password => password)
  end

  def libraries
    get("/data")
  end

  def store(database, document, data)
    post("/data/#{database}/#{document}", data.to_json)
  end

  private

  def post(path, params)
    request(:post, path, params)
  end

  def get(path, params=nil)
    request(:get, path, params)
  end

  def request(method, path, params)
    uri = (path.index("http") == 0) ? path : ("http://#{@library}.getangular.com" + path)
    response = @http.send(method, uri, params)
    if response.code == 302
      get(response.header["Location"][0])
    elsif response.code == 200
      parsed = parse(response)
      status_code = parsed['$status_code']
      raise "#{uri.to_s} responded with #{status_code}" if status_code && status_code != 200
      parsed
    else
      raise "#{uri.to_s} responded with #{response.code}"
    end
  end

  def parse(response)
    begin
      JSON.parse(response.body.content)
    rescue
      {}
    end
  end
end

Also available on GitHub for your forking pleasure.

Maybe in the future I’ll write up a blog post about how I’m using Angular.

Testing File Uploads To A Rack Server

Erik — Sat, 28 Mar 2009 19:28:46 +0000

I wrote a web app on top of Rack that includes the ability to accept file uploads. It took some time to figure out how to successfully test the file upload using Rack::Test.

The trick was to encode the file exactly correctly, and then post it with the correct headers. I wrote a simple post_file method to do this.

  def post_file(url, param_name, file_path, content_type)
    file_name = File.basename(file_path)
    boundary = "AaB03x"
    data = "--#{boundary}\r\n" +
           "Content-Disposition: form-data; name=\"#{param_name}\"; filename=\"#{file_name}\"\r\n" +
           "Content-Type: #{content_type}\r\n" +
           "\r\n" +
           "#{File.read(file_path)}\r\n" +
           "--#{boundary}--\r\n" +
           "\r\n"
    post(url, {}, {
      "CONTENT_TYPE" => "multipart/form-data, boundary=\"#{boundary}\"",
      "CONTENT_LENGTH" => data.length, :input => data })
  end

I call it from my test like this:

...
post_file("/my_app/upload", "uploaded_image", "../test-images/originals/loki.jpg", "image/jpeg")
...

and my app reads it like this:

...
request = Rack::Request.new(env)
...
uploaded_image = request.params["uploaded_image"][:tempfile]
...