CacheBot
CacheBot integrates with Heroku & your Ruby on Rails app to automatically bust your cache every time you deploy.
SUMMARY
CacheBot sets up a deploy hook on your app once you install it. From then on, every time you deploy any commits with the hashtag "#bust" in them, CacheBot will update your app's $RAILS_CACHE_ID with the latest commit hash.
This effectively busts your entire cache, as Rails prepends the value of that environment variable to every cache lookup.
INSECURE INSTALLATION (10 seconds)
If you would just like to use this for a test or inconsequential app, just run the following. CacheBot will take up to 10-20 minutes to recognize your app, but afterwards, cache-busts will happen immediately after deploy.
heroku sharing:add cache-bot@thirdprestige.com
Of course, this gives me full access to your code, database, and customer credit card data, so please don't do this for anything of consequence. I TAKE NO RESPONSIBILITY FOR ANY DAMAGE CAUSED.
THE ABOVE SERVICE IS ONLY PROVIDED FOR ACADEMIC PURPOSES.
SECURE INSTALLATION (5 minutes)
Just set up the app for yourself:
git clone git@github.com:nthj/heroku-cache-bot.git CacheBot
cd CacheBot
heroku create <prefix>-cache-bot --stack cedar
git push heroku master
heroku config:add DEPLOYHOOKS_HTTP_URL="https://<prefix>-cache-bot.herokuapp.com/%s" \
HEROKU_API_KEY=`<API KEY>` SECRET_TOKEN=`openssl rand -base64 32`
heroku addons:add scheduler:free
heroku addons:open scheduler
From the Heroku Scheduler Dashboard, please schedule setup to run every 10 minutes. (Not rake setup, just setup. See Procfile.)
Note: CacheBot will install the deployhooks:http addon into any app which it is a collaborator of, and doesn't have a $DEPLOYHOOKS_HTTP_URL already set, including non-Rails-apps, so be forewarned.
AUTOMATICALLY INCLUDE "#BUST" IN YOUR COMMIT MESSAGES
So, remembering to add "#bust" to your commit messages is annoying. But you also don't want to nuke your cache every time you deploy a change to your rake tasks, for example. So what to do? The included "commit-msg" hook should help you out.
Simply copy it into your local Rails project, and it will watch for any changes to any files in app/assets, app/views, or vendor/assets.
Sure, other changes might affect your cache as well, but this should catch most of them. You can always change this hook later, or manually append #bust to your commit.
curl https://raw.github.com/nthj/heroku-cache-bot/master/bin/commit-msg > .git/hooks/commit-msg
chmod +x .git/hooks/commit-msg
echo "Installed cache-bust commit hook into .git/hooks/commit-msg"