FastAPI : async GraphQL (Graphene)

fastapi-graphql.py

import graphene
from fastapi import FastAPI
from starlette.graphql import GraphQLApp
from graphql.execution.executors.asyncio import AsyncioExecutor

class Query(graphene.ObjectType):
    hello = graphene.String(
        name=graphene.String(default_value="stranger")
    )

    async def resolve_hello(self, info, name):
        # We can make asynchronous network calls here.
        return "Hello " + name

    
app = FastAPI()
app.add_route(
    "/graphql",
    GraphQLApp(
        schema=graphene.Schema(query=Query),
        executor_class=AsyncioExecutor
    )
)