Python GraphQL Federation Sample

This is an example of using GraphQL federation with python. This includes multiple python graphql servers and a federated gateway.

GraphQL Servers

Each server is made up of a default set of components

• app.py - This is a generic Flask based application file to serve the GraphQL service. This does not need to be modified outside of the Flask Port.
• schema/schema.graphql - This is the standard schema file where you define and document your service.
• schema/schema.py - This is the Class that you will use most. This allows you to create your resolvers and return the final schema to the Flask App
• schema/data_interface.py - This is just me stubbing out a data service so you can test this. You would create your own access to a DB or you could have this access a REST Api if you want.

Server A (User)

All data asociated with the User User - http://localhost:8300

Server B (Photo)

All data asociated with the Photo Photo - http://localhost:8301

Server C (Review)

All data asociated with the Review Review - http://localhost:8302

Federated Gateway

Gateway - http://localhost:4000

Docker Compose

To run this demo

docker-compose up --build

The Query Browser will run at http://localhost:4000 this is where you can test queries.

The config will also allow you yo use the individual GraphQL servers.

• User - http://localhost:8300
• Photo - http://localhost:8301
• Review - http://localhost:8302

Sample Queries

This will connect all of the GraphQL Schemas with one query.

query {
  users(first_name:"Han"){
    id
    first_name
    last_name
    photos{
      id
      url
      reviews{
        id
        title
        body
      }
    }
  }
}

{
  "data": {
    "users": [
      {
        "id": "100",
        "first_name": "Han",
        "last_name": "Solo",
        "photos": [
          {
            "id": "1000",
            "url": "https://upload.wikimedia.org/wikipedia/en/thumb/b/be/Han_Solo_depicted_in_promotional_image_for_Star_Wars_%281977%29.jpg/220px-Han_Solo_depicted_in_promotional_image_for_Star_Wars_%281977%29.jpg",
            "reviews": [
              {
                "id": "10000",
                "title": "Great Photo",
                "body": "Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, "
              }
            ]
          },
          {
            "id": "1001",
            "url": "https://pbs.twimg.com/media/BlrdTeMIQAAN1rv.jpg",
            "reviews": [
              {
                "id": "10001",
                "title": "Great Photo",
                "body": "Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, Lorem Ipsum Set Adore, "
              }
            ]
          }
        ]
      }
    ]
  }
}