graphql

This monorepo is an example GraphQL project for reference, learning and experimentation.

Features

This monorepo contains example of GraphQL gateway implementation using:

• Apollo Server Fastify
• Schema stitching
• Remote schema query delegation and batch query delegation
• Dataloader
• REST and MongoDB datasource
• Query caching with Redis
• Schema directive
• Subscription server and client using graphql-ws
• Subscription publish and subscribe using Redis PubSub
• Query instrumentation and monitoring using Prometheus and Grafana
• Query tracing using OpenTelemetry and Zipkin exporter

Getting Started

Run Docker Compose to start the following services:

• Zookeeper
• Kafka
• MongoDB
• Redis
• Prometheus (http://localhost:9090)
• Node Exporter
• Grafana (http://localhost:3000)
• Zipkin (http://localhost:9411)
• Remote GraphQL service (http://localhost:4001/graphql)
• REST service (http://localhost:4002)

$ docker-compose up

Add kafka to local machine /etc/hosts.

Add redis to local machine /etc/hosts:

# kafka       127.0.0.1
redis       127.0.0.1

Install packages.

$ yarn install

Start main gateway GraphQL service.

$ cd packages/gateway
$ yarn start

Load Apollo Sandbox in browser at http://localhost:4000/graphql.

Set subscriptions implementation to graphql-ws under Apollo Sandbox connection settings to enable subscriptions.