Host Counter

Simple hit counter, aggregating by hostname

Requires:

• Python
• Flask
• Redis

Development

To install locally and run in debug mode use:

# create virtual environment
virtualenv venv
source venv/bin/activate
pip install -r requirements.txt

# set ENV variables
source secrets.sh

# start redis
redis-server /usr/local/etc/redis.conf

# start flask
python app.py

When the dev server is running, the demo front-end will be accessible at http://localhost:5000/list.

Production

Deploy to Heroku with a Redis add-on. You may need to adjust the config variables to export to REDIS_URL.

Benchmarking

On Heroku with 4 dynos, we can measure over 300 req/sec using ApacheBench:

ab -n 1000 -c 100 -T application/x-www-form-urlencoded -p post.data http://host-counter.herokuapp.com/log

With more realistic AJAX requests, we measure only about 50 req/sec:

http://jsfiddle.net/jlevinger/w008sgrs/1/