Dapr gRPC Go

Intoduction

This project indicate how to interact with gRPC server and client using Dapr.

Technical Stack

Dapr - Helps developers build event-driven, resilient distributed applications. Whether on-premises, in the cloud, or on an edge device, Dapr helps you tackle the challenges that come with building microservices and keeps your code platform agnostic
gRPC - Modern open source high performance Remote Procedure Call (RPC) framework that can run in any environment
GO - Open source programming language that makes it easy to build simple, reliable, and efficient software
BloomRPC - Provide the simplest and most efficient developer experience for exploring and querying your GRPC services

Prerequisites

Go
Install the Dapr CLI

Get Started

Run Locally

gRPC Server

Run this command in the root directory

go mod init $project_name

go mod tidy

Start the gRPC server in greeting_server normally by

go run main.go

Then you can test the gRPC server as below

Start the Dapr using Dapr Cli

dapr init

Create a Dapr config config.yaml that indicate dapr runnign as gRPC proxy

apiVersion: dapr.io/v1alpha1
kind: Configuration
metadata:
  name: serverconfig
spec:
  tracing:
    samplingRate: "1"
    zipkin:
      endpointAddress: http://localhost:9411/api/v2/spans
  features:
    - name: proxy.grpc
      enabled: true

Start the gRPC server in greeting_server using Dapr by

dapr run --app-id server --app-protocol grpc --app-port 50051 --config config.yaml -- go run main.go

or in short form

dapr run -a server -P grpc -p 50051 -c config.yaml -- go run main.go

Then you can view the Dapr dashboard by

dapr dashboard

and view the dashboard in http://localhost:8080 and remember the Dapr gRPC Port

Then you can test the gRPC server using Dapr as gRPC proxy as below

You must indicate the metadata when using Dapr gRPC server by specifying its dapr-app-id as the one you start the server using Dapr Cli

gRPC Client

Start the gRPC server in greeting_client using Dapr cli by

dapr run --app-id client --dapr-grpc-port 50007 --config config.yaml -- go run main.go

Please noted that you must indicate the metadata when calling the gRPC server like or involving the metdata using other programming language, plese view here

ctx = metadata.AppendToOutgoingContext(ctx, "dapr-app-id", "server")

Reference

How-To: Invoke services using gRPC | Dapr Docs

Deploy Dapr on a Kubernetes cluster | Dapr Docs

Overview of Dapr on Kubernetes | Dapr Docs

quickstarts/hello-kubernetes at master · dapr/quickstarts (github.com)

jeffreychuuu/dapr_grpc_go