Python SAGA Pattern Example

Implemented SAGA Pattern through python for distributed transaction.

• FastAPI
• RabbitMQ

There is three microsevices.

• Order
• Stock
• Delivery

Case of success

Each service is listening to a specific queue, as shown above.

To briefly explain the flow,

1. User - Order product through /order/{item_id}
2. Order - Execute local transaction
3. Order - Produce event to ORDER_CREATED
4. Stock - Consume ORDER_CREATED and if got some, execute local transaction
5. Stock - Produce event to STOCK_SUCCESS
6. DELIVERY - Consume STOCK_SUCCESS and if got some, execute local transaction
7. DELIVERY - Produce event to DELIVERY_SUCCESS
8. Order - Consume DELIVERY_SUCCESS
9. Order - Change order status to complete and distributed transaction is end