This repo is a demonstration of hooking into the Thumbor event system and propogating a message to Redis so external systems can subscribe. The Thumbor event system is still under development so we currently have a dependency on my hacked together fork of the refactor branch of Thumbor (where the work is taking place).

You'll need the following to run this:

1. docker
2. python 3.6
3. pip
4. virtualenv
5. git
6. curl

You can set up your python environment using a virtualenv like this

mkdir thumbor-redis-pubsub-venv
cd thumbor-redis-pubsub-venv
virtualenv -p python3.6 .
. bin/activate
cd /path/to/cloned/thumbor-redis-pubsub
pip install -r requirements.txt

You'll need four terminals to run this.

Run the Redis server

./scripts/01-redis-server.sh

Run Thumbor using our wrapper

pushd /path/to/thumbor-redis-pubsub-venv && . bin/activate && popd # we need the virtualenv for this
./scripts/02-thumbor-server.sh

Run the Redis subscriber so we can read the queue

pushd /path/to/thumbor-redis-pubsub-venv && . bin/activate && popd # we need the virtualenv for this
./scripts/03-redis-subber.sh

Now upload an image and you'll see the event come through in the listener

./scripts/04-upload-image.sh

You should see something like the following in your terminal that's running the Thumbor server

2018-02-20 15:59:26 thumbor:DEBUG trigger asynchronous <asyncblink.NamedAsyncSignal object at 0x7eff52c26400; 'imaging.after_upload_image'>
async call due to after_upload event
Published event to Redis: {"method": "POST", "location": "/image/3aafefc9a2e84099bbfdeb8efde296dc/logo-thumbor.png"}

...and something like the following the listener terminal

Listening on channel thumbor_uploads
received "{'method': 'POST', 'location': '/image/3aafefc9a2e84099bbfdeb8efde296dc/logo-thumbor.png'}"