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Thrift GraphQL Demo

This repo is in my blog post.

This repo has 3 services

  • service-gql
    • Written in Nodejs
    • Uses Thrift clients to communicate to other services
    • Apollo GraphQL server
  • service-post
    • Written in Golang
    • Thrift server for Posts data
  • service-user
    • Written in Golang
    • Thrift server for User data

Each service has a /deployments folder which contains a Dockerfile to build the image.

Get started

Kubernetes

In the root of the directory and kubectl configured for the kubernetes cluster

$ kubectl apply -R -f k8s/

Docker Compose

In the root of the directory and having docker-compose installed

$ docker-compose up

Native

In each of the service-post and service-user folder

$ go mod download
$ go run cmd/thrift/main.go -addr :<port>

By default the port is 9090 so be sure to change them for any one service

In the service-gql folder

$ npm install

Create .env file in the folder and add the following lines

GRAPHQL_PORT=3000
SERVICE_USER_HOST=localhost
SERVICE_USER_PORT=9090
SERVICE_POST_HOST=localhost
SERVICE_POST_PORT=9091

Or, alternatively - set the values as environment variables

And finally

$ npm start

Check

$ curl -H 'Content-Type: application/json' -X POST -d '{"query": "query { ping { message } postPing { message } userPing { message  } }"}' http://localhost:3000/graphql
{"data":{"ping":{"message":"ping"},"postPing":{"message":"ping"},"userPing":{"message":"ping"}}}

You can see the logs accordingly for each service

Modifying Thrift

You can modify the .thrift files in any service-{user,post} and be sure to copy them over to service-gql. Then simply run the following service in the folder.

$ ./build/thrift-gen.sh

Don't forget to implement the changes!

Don't forget to change the schema!

Future

  • Further implementation
    • CRUD for service-user
    • CRUD for service-post
    • Healthchecks for all services
  • Istio
    • Make another image with _version as 2 (Enables Traffic Shifting, etc)
    • Metrics