gokit-todo

Service	Description
todo	todoMVC backend API
gokit-todo-frontend	todoMVC client

Features

• Kubernetes/GKE: The app is designed to run on Kubernetes (both locally on "Docker for Desktop", as well as on the cloud with GKE).
• gRPC: Microservices use a high volume of gRPC calls to communicate to each other.
• Istio: Application works on Istio service mesh.
• Skaffold: Application is deployed to Kubernetes with a single command using Skaffold.
• go-kit/kit: Go kit is a programming toolkit for building microservices (or elegant monoliths) in Go. We solve common problems in distributed systems and application architecture so you can focus on delivering business value.
• todomvc: Helping you select an MV* framework

Motivation

I use go-kit/kit(microservices toolkit) to build business project and run on Kubernetes and Istio. I also to give few talks about How i use gokit

• GoPherCon 2020 TW: 如何透過 Go-kit 快速搭建微服務架構應用程式實戰 ｜ KaiChu
• GDG Cloud Taipei meetup #50 - Build go kit microservices at kubernete…
• GDG Devfest 2019 - Build go kit microservices at kubernetes with ease
• cage1016/gokit-workshop

Go kit microservices toolkit include many microservices components itself (auth, circuitbreaker, ratelimit etcs.). We build microservices application and deploy to Kubernetes. We could drop those microservices components out with Service Mesh soluation (Istion Envoy proxy) and keep single microservice core business logic clear without any infra codes.

This demo project is todomvc/gokit-todo-frontend backend API implemented by gokit microservice tookit with best practice by myself.

Goals

• Project: quick start a new microservice by toolchain cage1016/gk. Team member could follow same guideline to develop microservice quickly.
  • project layout
• Testing: how to write unit test with table test go-sqlmock and gomock. integration test, e2e test with TestMain and docker-compose
• DevOps: setup CI/CD workflow to increase devops lifecycle
  • skaffold
  • github action (CI)
  • Kubernetes
  • Istio

Install

this demo support docker-compose or nginx-ingress and istio

Docker-Compose

1. Run todomvc frontend & gokit-todo backend API with docker-compose

   docker-compose -f docker-compose.full.yaml up -d

2. Visit http://localhost:8080 for demo
3. Clean docker-compose

   docker-compose -f docker-compose.full.yaml down --volume

k8s + Istio

1. Prepare a Kubernetes cluster
2. Install Istio (1.6.11)

   istioctl install
   kubectl label namespace default istio-injection=enabled

3. Install gokit-todo & frontend

   kubectl apply -f https://raw.githubusercontent.com/cage1016/gokit-todo/master/deployments/k8s-istio.yaml

4. Set up GATEWAY_HTTP_URL

   export INGRESS_HTTP_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].port}')
   export INGRESS_HOST=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')
   export GATEWAY_HTTP_URL=$INGRESS_HOST:$INGRESS_HTTP_PORT
   echo $GATEWAY_HTTP_URL

5. Visit $GATEWAY_HTTP_URL to access todomvc with gokit-todo backend API
6. Delete gokit-todo & frontend

   kubectl delete -f https://raw.githubusercontent.com/cage1016/gokit-todo/master/deployments/k8s-istio.yaml

7. Uninstall Istio

   istioctl manifest generate | kubectl delete -f -
   kubectl delete namespace istio-system
   kubectl label namespace default istio-injection=enabled --overwrite

k8s + nginx-ingress

1. Prepare a Kubernetes cluster
2. Install nginx-ingress CRD by helm3

   helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
   helm repo update
   helm install ingress-nginx ingress-nginx/ingress-nginx

3. Install gokit-todo & frontend

   kubectl apply -f https://raw.githubusercontent.com/cage1016/gokit-todo/master/deployments/k8s-nginx-ingress.yaml

4. Set up INGRESS_HTTP_URL

   export INGRESS_HTTP_PORT=$(kubectl get ingress frontend-ingress -o jsonpath='{.spec.rules.*.http.paths.*.backend.servicePort}')
   export INGRESS_HOST=$(kubectl get ingress frontend-ingress -o jsonpath='{.status.loadBalancer.ingress.*.hostname}')
   export INGRESS_HTTP_URL=$INGRESS_HOST:$INGRESS_HTTP_PORT
   echo $INGRESS_HTTP_URL

5. Visit $INGRESS_HTTP_URL to access todomvc with gokit-todo backend API
6. Delete gokit-todo & frontend

   kubectl delete -f https://raw.githubusercontent.com/cage1016/gokit-todo/master/deployments/k8s-nginx-ingress.yaml

7. Uninstall nginx ingress

   helm uninstall ingress-nginx

Testing

1. Makefile

   $ make
     down                           docker-compose down
     generate                       Regenerates GRPC proto and gomock
     help                           this help
     mod                            tidy go mod
     run                            docker-compose stop & up
     stop                           docker-compose stop
     test                           test: run unit test
     test-e2e                       test-e2e: run e2e test
     test-integration               test-integration: run integration test
     up                             docker-compose up

2. unit test

   make test

3. unit integration test by docker-compose

   make test-integration

4. unit e2e test by docker-compose

   make test-e2e

License

Copyright © 2020 kaichu.io.
This project is MIT licensed.