能否将 graphQL 设置为 Firebase 中的可调用函数（以及如何设置？）？

Question

Can graphQL be set up as a callable function in Firebase? All the examples in internet I was able to find set graphQL as onRequest HTTP function. Would it be possible to use the onCall function for graphQL? How to do it?

The reason I'd prefer to do it this way is authentication - callable functions offer the context object containing all relevant user data (or at least that's how I understand them), so you don't need to bother with handling the tokens.

Here's a simple template of a graphQL server inside an onRequest function using express-graphql :

const functions = require("firebase-functions");
const express = require('express');
const { graphqlHTTP } = require('express-graphql');
const {
    GraphQLObjectType,
    GraphQLString,
    GraphQLSchema,
    GraphQLID
} = require('graphql');

const app = express();

const RootQuery = new GraphQLObjectType({
    name: 'Query',
    fields: {
        tournament: {
            type: GraphQLString,
            args: {
                id: { type: GraphQLNonNull(GraphQLID) }
            },
            resolve(parentValue, args) {
                return 'Some result for id: ' + args.id
            }
        },
    }
})

const schema = new GraphQLSchema({
    query: RootQuery
})

app.use(
    '/',
    graphqlHTTP({
        schema, 
        rootValue: root, // contents not relevant to the question
        graphiql: true,
    })
);

exports.graphql = functions.https.onRequest(app);

• How to transform this template into onCall function?
• How to call the transformed function from the client using httpsCallable() method, so that the query/endpoint name and args are passed properly?

Answer 1

What you can do in a "simple" HTTP Cloud Function can be done in a Callable Cloud Function .

Actually, Callable Cloud Functions are HTTP Cloud Functions with specific request and response formats, see the Protocol specification .