Executor with a locally defined schema pattern

[DianaSuvorova]

I think this pattern should exist or be possible.

So I would like to use an executor patter , ie delegate all queries to a remote GraphQL server in runtime, yet I would to store a copy of its schema locally. ie I don't want to do an introspection query.

Here is an example of a code that does not work with targetSchema.getQueryType is not a function

import { fetch } from 'cross-fetch';
import { print } from 'graphql';
import { introspectSchema, wrapSchema } from '@graphql-tools/wrap';\
import gql from 'graphql-tag';

const typeDefs = gql`
 type Query {
 hello: String
}
`;

const executor = async ({ document, variables }) => {
  const query = print(document);
  const fetchResult = await fetch('http://example.com/graphql', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({ query, variables }),
  });
  return fetchResult.json();
};

export default async () => {
  const schema = wrapSchema({
    schema: typeDefs, 
    executor,
  });
  return schema;
};

That this does not work makes sense but I think there should be a pattern that would allow to connect remote executor and local schema.

Thank you 🙏

[DianaSuvorova]

I think my question is similar to this one: #2930

Where introspection query for remote server is still needed but it is done inside a resolver which. I can get behind that. I will take a look at the example discussed there.

Thanks!

[ardatan]

Could you create a reproduction and actually a failing test would be even better? Because it looks a valid case for me and I believe it should work

[DianaSuvorova]

@ardatan here is a repro repo https://github.com/DianaSuvorova/wrap/blob/main/index.js

I'd be happy to try to add actual test if I can figure out how to run it locally -> doing npm install && npm run test inside the root of the graphql-tools also inside individual packages give me Cannot find module .... errors on all the tests. I tried to build the package in between as well.
If you can follow up with instructions how to run the test, I can ty again - otherwise please refer to the repro example

[ardatan]

Ok so the problem is schema: typeDefs doesn't work because schema should be a GraphQLSchema not DocumentNode. You should use buildSchema(SDL_String) or buildASTSchema(DocumentNode) to build a nonexecutable schema

[DianaSuvorova]

Thank you 🙏. This makes sense... and works