Catalyst Order Processing Workflow

This solution demonstrates the capabilities provided by all five Catalyst APIs through a python-based order processing workflow. The end-to-end solution is comprised of five services:

• order-processor: Contains the order process workflow definition and all associated activity methods which will be executed as part of the workflow sequence using the Catalyst Workflow API.
• inventory: Receives direct invocation requests sent by the order-processor using the Invocation API to manage inventory state in the Diagrid KV Store through the Catalyst State API.
• notifications: Subscribes to messages published by the order-processor using the Pub/Sub API and subsequently displays those messages through a simple JavaScript user interface.
• shipping: Receives direct invocation requests sent by the order-processor using the Invocation API to simulate the scheduling of order shipments.
• payments: Receives direct invocation requests sent by the order-processor using the Invocation API to mock the processing of order payments.

Prerequisites

• Sign up for Diagrid Catalyst
• Install latest Diagrid CLI
• Install Python3

Prepare applications

The build apps file will go through each application directory and run any app commands necessary to prepare the applications to run. Make sure it is executable using the below command:

chmod +X build-apps.sh

Run the script:

./build-apps.sh

Deploy Catalyst resources

Replace unique-project-name with a name for your workflow project

export WORKFLOW_PROJECT_NAME="unique-project-name"

Execute the following command to run your applications locally and create the dependent Catalyst resources:

diagrid dev run -f dapr.yaml --project $WORKFLOW_PROJECT_NAME

Use the APIs

A test.rest file is available at the root of this repository and can be used with the VS Code Rest Client extension.