Quart/ Ariadne example

graphql_ariadne.py

"""
# graphql query to run in the playground
{
  hello
}
"""
 
from ariadne import QueryType, graphql, make_executable_schema
from ariadne.constants import PLAYGROUND_HTML
from quart import Quart, request, jsonify
from ariadne.asgi import GraphQL

app = Quart(__name__)

# define a graphql schema
type_defs = """
    type Query {
        hello: String!
    }
"""

query = QueryType() # graphql backend seems to require a query object, everybody uses this pattern

# resolver for the field 'hello'
@query.field("hello")
async def resolve_hello(_, info) -> str:
    request = info.context
    user_agent = request.headers.get("User-Agent", "Guest")
    return "Hello, %s!" % user_agent

schema = make_executable_schema(type_defs, query) # kind of magical

@app.route("/", methods=["GET"])
async def index() -> str: # just here to confirm quart is running
    return "Hello, Ariadne"

@app.route("/graphql", methods=["GET"])
async def graphql_playgroud() -> str: # supplies playground environment
    return PLAYGROUND_HTML, 200

@app.route("/graphql", methods=["POST"])
async def graphql_server() -> str:
    data = await request.get_json()
    success, result = await graphql( # this is the async interface, flask uses sync_graphql
        schema,
        data,
        context_value=request,
        debug=app.debug
    )
    return jsonify(result), 200 if success else 400

if __name__ == "__main__":
    app.run(debug=True)