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.

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, "
              }
            ]
          }
        ]
      }
    ]
  }
}

shaungehring/python-graphql-federation-sample