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!",
"alexgenco@gmail.com"
], "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
endThis 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
- Fork it ( https://github.com/[my-github-username]/site_watcher/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create a new Pull Request