Kafka Playground

A collection of everything.

Life Stream

Collect and act on events occuring in the life of an individual.

Packages

• Sbanken API Client
• Sbanken Transfers Consumer
• Strava API Client
• Strava Webhook Producer
• Node Notifier Consumer
• Console Consumer

Create a .env file with a bunch of variables

export SBANKEN_APPLICATION_CLIENT_ID=xxx
export SBANKEN_USER_ID=xxxxxxxxxxx
export SBANKEN_SECRET=xxx
export STRAVA_ACCESS_TOKEN=xxxxx

Components

Strava Webhook Producer

The Strava webhook producer receives webhook events from Strava and forwards them to Kafka.

Running it locally

1. Expose the running process

PORT=3000 node packages/strava-webhook-producer
autossh -M 0 -R 80:localhost:3000 serveo.net

2. Register it with Strava

Replace client_id, client_secret and verify_token with something else. The callback_url should match what the previous command gave you. You might also need to contact the Strava Developer team via email to have them enable webhooks for you.

curl -X POST \
  https://api.strava.com/api/v3/push_subscriptions \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -F client_id=xxxxx \
  -F client_secret=xxxx \
  -F callback_url=https://xxxxx.serveo.net/strava \
  -F verify_token=hanse

After the registration is finished you should start receving events whenever things happen on Strava such as creating a new activity or changing the title of an exisiting. You must also remember to authorize your app with your account or else you won't get any data.

Start the console consumer (node packages/console-consumer strava) to see the messages in this topic.

Sbanken Transfers Consumer

The Sbanken Transfers Consumer reads messages from the strava topic and does something cool whenever a new Strava activity is created.

node packages/strava-transfers-consumer

The cool things it does is to move an amount of money equal do the difference between the elapsed time and the configured target time from a checking account to a savings account utilizing Sbanken Open Banking APIs.

E.g. given a configured target of 20 minutes, 10 NOK will be transferred if I run for 30 minutes. How useful 🍾.

Cookbook

Install locally on macOS

brew install kafka
brew services start zookeeper
brew services start kafka

# node-rdkafka needs this (see: https://github.com/Blizzard/node-rdkafka#mac-os-high-sierra)
export CPPFLAGS=-I/usr/local/opt/openssl/include
export LDFLAGS=-L/usr/local/opt/openssl/lib

yarn

Read messages from the topic topic

kafka-console-consumer --bootstrap-server localhost:9092 --from-beginning --topic topic

Open a prompt for producing messages to the topic chat

kafka-console-producer --broker-list localhost:9092 --topic chat

Create a topic with 2 partitions

kafka-topics --zookeeper localhost:2181 --create --topic topic2 --partitions 2 --replication-factor 1