invoke-simple

Example - Invoke a service

This example utilizes a receiver and a caller for the OnInvoke / Invoke functionality. It will create a gRPC server and bind the OnInvoke method, which gets called after a client sends a direct method invocation.

Note: Make sure to use the latest proto bindings

Pre-requisites

• Dapr CLI and initialized environment
• Install Python 3.10+

Install Dapr python-SDK

pip3 install dapr dapr-ext-grpc

Running in self-hosted mode

Run the following command in a terminal/command-prompt:

# 1. Start Receiver (expose gRPC server receiver on port 50051)
dapr run --app-id invoke-receiver --app-protocol grpc --app-port 50051 python3 invoke-receiver.py

In another terminal/command prompt run:

# 2. Start Caller
dapr run --app-id invoke-caller --app-protocol grpc --dapr-http-port 3500 python3 invoke-caller.py

Cleanup

dapr stop --app-id invoke-caller
dapr stop --app-id invoke-receiver

Running in Kubernetes mode

1. Build docker image

   docker build -t [your registry]/invokesimple:latest .
   

2. Push docker image

   docker push [your registry]/invokesimple:latest
   

3. Edit image name to [your registry]/invokesimple:latest in deploy/*.yaml

4. Deploy applications

   kubectl apply -f ./deploy/
   

5. See logs for the apps and sidecars

   Logs for caller sidecar:

   dapr  logs -a invoke-caller -k
   

   Logs for caller app:

   kubectl logs -l app="invokecaller" -c invokecaller
   

   Logs for receiver sidecar:

   dapr  logs -a invoke-receiver -k
   

   Logs for receiver app:

   kubectl logs -l app="invokereceiver" -c invokereceiver