This service sends a tweet via the @IBMStockTrader account on Twitter.

This service expects a JSON object in the http body, containing the following fields: id, owner, old, and new. It returns a JSON object containing the message sent (or any error message from the attempt) and the location (Twitter).

There is another implementation of this service called notification-slack, which posts the message to a Slack channel instead. If both implmentations of the Notification service are installed, you could use Istio routing rules to determine which gets used, and under what conditions.

Account Setup

IBMStockTrader needs 4 keys from Twitter before messages can be posted to an account. To get those values, log into Twitter and navigate to https://developer.twitter.com/en. Click into the Apps menu on the top right of the webpage.

Apply for a developer account. Once that is complete, create your first app. In the app details menu, navigate to the Keys and tokens tab. Here you will find the 4 keys (Consumer API key & secret key, Access token & token secret) that StockTrader needs to tweet messages.

Assign these values to their respective keys when creating a StockTrader instance.

Deploy

Use WebSphere Liberty helm chart to deploy Twitter Notification microservice:

helm repo add ibm-charts https://raw.githubusercontent.com/IBM/charts/master/repo/stable/
helm install ibm-charts/ibm-websphere-liberty -f <VALUES_YAML> -n <RELEASE_NAME> --tls

In practice this means you'll run something like:

helm repo add ibm-charts https://raw.githubusercontent.com/IBM/charts/master/repo/stable/
helm install ibm-charts/ibm-websphere-liberty -f manifests/notification-twitter-values.yaml -n notification-twitter --namespace stock-trader --tls