Sample gRPC Service in Go

The following gRPC sample project is built in Go and connects to a MongoDB. The project also exposes the services as HTTP. In the examples directory you will see both gRPC and HTTP client samples.

Authored by: Rob Taylor [email protected]

Getting Started

Running service from CLI

go mod download
go mod vendor
go run cmd/example/main.go

Running as docker container (using docker-compose)

make docker
make compose

Building an executable

make
./bin/example

Running example gRPC and HTTP clients

Be sure the service is running using one of the methods above

go run examples/main.go

Running HealthCheck

First install health checker:

• https://github.com/grpc-ecosystem/grpc-health-probe

~/go/bin/grpc-health-probe -addr=localhost:8080

Run tests

go test ./...

Learn more from these resources

Go layout standards

• https://github.com/golang-standards/project-layouts

gRPC Basics

• https://medium.com/@lchenn/generate-grpc-and-protobuf-libraries-with-containers-c15ba4e4f3ad
• https://github.com/grpc/grpc-go/blob/master/examples/helloworld/greeter_client/main.go
• https://grpc.io/docs/quickstart/go/
• https://grpc.io/docs/tutorials/basic/go/
• https://github.com/gogo/protobuf

gRPC compiler used

• https://github.com/TheThingsIndustries/docker-protobuf

Exposing gRPC through HTTP

• https://github.com/grpc-ecosystem/grpc-gateway

Heath Check (commonly used Kubernetes pods)

• https://github.com/grpc-ecosystem/grpc-health-probe
• https://developpaper.com/k8s-and-health-examination-best-practice-of-grpc-service-health-examination/
• https://github.com/grpc/grpc/blob/master/doc/health-checking.md
• https://github.com/grpc/grpc-go/tree/master/health