SiteWatcher

I wrote this to notify me when the Wii U Gamecube controller adapter becomes available.

Usage

Here's an example script. I'm using this to monitor gamestop.com and bestbuy.com:

require "site_watcher"

SiteWatcher.watch(every: 2) do
  # HTML
  page("http://www.gamestop.com/wii-u/accessories/wii-u-gamecube-adapter/115426") do
    # Use RSpec to describe your expectations.
    test do |page|
      # `page` is a `Capybara::Node::Simple`. See available matchers here:
      # http://www.rubydoc.info/github/jnicklas/capybara/Capybara/Node/Matchers
      expect(page).not_to have_selector("div.buy1 div.buttonna")
    end

    fulfilled do |url|
      # Call this block when your expectations are met. Here I send myself an email.
      IO.popen(
        [
          "/usr/bin/mail",
          "-s", "GC controller adapter is available!",
          "[email protected]"
        ], "w"
      ) { |io| io.puts(url) }
    end
  end

  # JSON
  page("http://www.bestbuy.com/api/1.0/product/summaries?skus=7522006") do
    # Continue watching this page even after fulfillment
    remove_on_fulfillment false

    test do |json|
      # `json` is a hash of the parsed JSON body.
      expect(
        json[0]["availability"]["ship"]["displayMessage"]
      ).not_to match(/not available/i)
    end
  end
end

This script will block until all expectations have been fulfilled and removed. Using remove_on_fulfillment false will cause it to block indefinitely.

See integration specs for more up-to-date usage examples.

Testing fulfillment

You can force a SiteWatcher.watch process to run each of its fulfilled blocks by sending it the USR1 signal. The process will continue to run as normal after each block has been called.

Contributing

1. Fork it ( https://github.com/[my-github-username]/site_watcher/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request