quickstarts/pub_sub/python

Dapr pub/sub

In this quickstart, you'll create a publisher microservice and a subscriber microservice to demonstrate how Dapr enables a publish-subcribe pattern. The publisher will generate messages of a specific topic, while subscribers will listen for messages of specific topics. See Why Pub-Sub to understand when this pattern might be a good choice for your software architecture.

Visit this link for more information about Dapr and Pub-Sub.

Note: This example leverages the Dapr client SDK. If you are looking for the example using only HTTP requests click here.

This quickstart includes one publisher:

• Python client message generator checkout

And one subscriber:

• Python subscriber order-processor

Run Python message publisher with Dapr

1. Open a new terminal window and navigate to checkout directory:

cd checkout

2. Install dependencies:

pip3 install -r requirements.txt 

3. Run the Python publisher app with Dapr:

dapr run --app-id checkout --components-path ../../components/ -- python3 app.py

Run Python message subscriber with Dapr

1. Open a new terminal window and navigate to checkout directory:

cd order-processor

2. Install dependencies:

pip3 install -r requirements.txt 

3. Run the Python subscriber app with Dapr:

dapr run --app-id order-processor --components-path ../../components/ --app-port 5001 -- python3 app.py