Go Server/API boilerplate using best practices, DDD, CQRS, ES, gRPC.

The main purpose of this project is to provide boilerplate project setup using best practices, DDD, CQRS, ES, gRPC. Featuring kubernetes for both development and production environments. Allowing to work with environment reflecting production one, allowing to reduce any misconfigurations.

This is mono-repository of many services such as authentication or user domain. Each service has it own code base with exception of shared packages to simplify things for this boilerplate. Services communicate witch each other using gRPC. Each service might expose HTTP API for external communication or/and gRPC.

This project setup should reduce the time spent on environment configuration for the whole kubernetes cluster and/or each of microservice. Extracting each of services to own repository or keeping it as mono-repo should be a matter of preference.

Please look for comments like @TODO and @FIXME to better understand things than need attention.

This boilerplate includes simple Web UI to demonstrate example interaction with API. Once deployed and hosts are set please visit https://api.go-api-boilerplate.local to access UI.

1. Rest API
2. Docker
3. Kubernetes
4. Helm chart
5. Terraform
6. gRPC
7. Domain Driven Design (DDD)
8. CQRS
9. Event Sourcing
10. Hexagonal, Onion, Clean Architecture
11. oAuth2

Worth getting to know packages used in this boilerplate:

1. gorouter
2. message-bus
3. gollback
4. shutdown
5. pubsub
6. pushpull
7. gocontainer

• Wiki
• Package level docs
• Getting Started
• Installing and Setting up
• Configuration
• Guides

Edit /etc/hosts to add localhost alias

➜ go-api-boilerplate git:(master) cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 go-api-boilerplate.local api.go-api-boilerplate.local maildev.go-api-boilerplate.local mysql.go-api-boilerplate.local

make docker-build BIN=auth
make docker-build BIN=migrate
make docker-build BIN=user
make docker-build BIN=web

Creating tag with metadata will trigger github workflow and publish docker image to GitHub Package Registry.

Tag v1.0.0+user will trigger build for user service releasing 1.0.0 docker image tag. you can create release for all services in cmd directory.

v1.0.0+auth
v1.0.0+user
v1.0.0+web
v1.0.0+migrate

Replace image details in main.yaml

  image:
-    repository: go-api-boilerplate-user
+    repository: docker.pkg.github.com/vardius/go-api-boilerplate/go-api-boilerplate-user
-    tag: latest
+    tag: 1.0.0
    pullPolicy: IfNotPresent

repeat for all services and migrate init containers.

Log in to Docker

docker login

Copy docker config

cp ~/.docker/config.json ./k8s/.docker/config.json

Verify config.json

make terraform-install

make terraform-destroy

If persistent volume is stack in terminating, this happens when persistent volume is protected. You should be able to cross verify this:

kubectl describe pvc PVC_NAME --namespace=go-api-boilerplate | grep Finalizers

Output:
Finalizers:    [kubernetes.io/pvc-protection]

You can fix this by setting finalizers to null using kubectl patch:

kubectl patch pvc PVC_NAME --namespace=go-api-boilerplate -p '{"metadata":{"finalizers": []}}' --type=merge

Build flags are used for different persistence layers. Please see services.go file for details. Provided layers are mysql, mongo and memory. If desired in similar way new layer can be easily added, following given patter.

go build -tags=persistence_mysql

• persistence_mysql (mysql service container)
• persistence_mongodb (mongodb service container)

Important persistence layer defaults to memory if no flag is provided (Docker image sets persistence_mysql flag), see each service Dockerfile for details.

Send example JSON via POST request

curl -d '{"email":"[email protected]"}' -H "Content-Type: application/json" -X POST https://api.go-api-boilerplate.local/users/v1/dispatch/user/user-register-with-email --insecure

Get user details https://api.go-api-boilerplate.local/users/v1/34e7ed39-aa94-4ef2-9422-401bba9fc812

{"id":"34e7ed39-aa94-4ef2-9422-401bba9fc812","email":"[email protected]"}

Get list of users https://api.go-api-boilerplate.local/users/v1?page=1&limit=10

{"page":1,"limit":20,"total":1,"users":[{"id":"34e7ed39-aa94-4ef2-9422-401bba9fc812","email":"[email protected]"}]}

Access protected route using auth token https://api.go-api-boilerplate.local/users/v1/me.

{"code": "401","message": "Unauthorized"}

Request access token for user

curl -d '{"email":"[email protected]"}' -H "Content-Type: application/json" -X POST https://api.go-api-boilerplate.local/users/v1/dispatch/user/user-request-access-token --insecure

Get your access token from mail catcher https://maildev.go-api-boilerplate.local.

Access protected route using auth token https://api.go-api-boilerplate.local/users/v1/me?authToken=eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJyXHUwMDE277-977-977-977-9IiwiZXhwIjoxNTU5NjEwOTc2LCJzdWIiOiIzNGU3ZWQzOS1hYTk0LTRlZjItOTQyMi00MDFiYmE5ZmM4MTIifQ.pEkgtDAvNh2D3Dtgfpu4tt-Atn1h6QwMkDhz4KpgFxNX8jE7fQH00J6K5V7CV063pigxWhOMMTRLmQdhzhajzQ

{"id":"34e7ed39-aa94-4ef2-9422-401bba9fc812","email":"[email protected]"}

Want to contribute ? Feel free to send pull requests!

Have problems, bugs, feature ideas? We are using the github issue tracker to manage them.

Rafał Lorenz

Marin Kirkov

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