gRPC proxy example with Dapr and Go

This example shows how to use Dapr gRPC proxying with Go using native gRPC clients and servers.

Getting started

Prerequisites:

• Go
• Dapr CLI

Install Dapr

If you haven't already run dapr init, do so via your terminal:

$ dapr init

Run the gRPC Go server

cd greeter_server
go mod tidy

dapr run --app-id server --dapr-grpc-port 50006 --app-port 50051 -- go run main.go

Run the gRPC Go client

cd greeter_client
go mod tidy

dapr run --app-id client --dapr-grpc-port 50001 -- go run main.go

Verify it works

If everything is set up correctly, you should see an output similar to this:

== APP == 2022/11/21 16:12:07 Greeting: Hello 0, 20221121161207
== APP == 2022/11/21 16:12:08 Greeting: Hello 1, 20221121161208
== APP == 2022/11/21 16:12:09 Greeting: Hello 2, 20221121161209
== APP == 2022/11/21 16:12:10 Greeting: Hello 3, 20221121161210
== APP == 2022/11/21 16:12:11 Greeting: Hello 4, 20221121161211
== APP == 2022/11/21 16:12:12 Greeting: Hello 5, 20221121161212
== APP == 2022/11/21 16:12:13 Greeting: Hello 6, 20221121161213
== APP == 2022/11/21 16:12:14 Greeting: Hello 7, 20221121161214
== APP == 2022/11/21 16:12:15 Greeting: Hello 8, 20221121161215
== APP == 2022/11/21 16:12:16 Greeting: Hello 9, 20221121161216

Running on Kubernetes

Running this example on Kubernetes is the same as running it locally. You simply need to Dockerize your code and assign the dapr.io/app-id value to client and server on your deployments.

Deploy the server

cd greeter_server
kubectl apply -f deploy.yaml

Wait until the server is running with 2/2 containers.

Deploy the client

cd greeter_client
kubectl apply -f deploy.yaml

Observe the calls

kubectl logs -l app=server -c server -f