quickstarts/service_invocation/python/http

Service Invocation

In this quickstart, you'll create a checkout service and an order processor service to demonstrate how to use the service invocation API. The checkout service uses Dapr's http proxying capability to invoke a method on the order processing service.

Visit this link for more information about Dapr and service invocation.

This quickstart includes one checkout service:

• Python client service checkout

And one order processor service:

• Python order-processor service order-processor

Run Python order-processor with Dapr

1. Install dependencies for order-processor app:

pip3 install -r order-processor/requirements.txt 

2. Run the Python order-processor app with Dapr:

dapr run --app-port 8001 --app-id order-processor --app-protocol http --dapr-http-port 3501 -- python3 order-processor/app.py

Run Python checkout with Dapr

1. Open a new terminal window and install dependencies for checkout app:

pip3 install -r checkout/requirements.txt 

2. Run the Python checkout app with Dapr:

dapr run  --app-id checkout --app-protocol http --dapr-http-port 3500 -- python3 checkout/app.py

dapr stop --app-id checkout
dapr stop --app-id order-processor

Start all apps with multi app run template file:

The dependencies are already installed from previous steps. Simply run the multi app run template. It uses dapr.yaml file to determine which applications to run.

dapr run -f .

Finally, stop all:

dapr stop -f .