An example of a GraphQL gateway set up using the `prepare()` function from GrAMPS.

1-gateway-using-prepare.js

import Express from "express";
import getPort from "get-port";
import bodyParser from "body-parser";
import { prepare } from "@gramps/gramps";
import { GraphQLSchema } from "graphql";
import { graphqlExpress, graphiqlExpress } from "apollo-server-express";

const MyDataSource = {
  namespace: "Test",
  typeDefs: `type Query { getVal: String }`,
  resolvers: { Query: { getVal: (_, __, ctx) => ctx.getVal() } },
  context: { getVal: () => "value!" }
};

async function startServer(app) {
  const PORT = await getPort(8080);
  app.listen(PORT, () => {
    console.log(`=> server running at http://localhost:${PORT}/`);
  });
}

const app = Express();
const GraphQLOptions = prepare({ dataSources: [MyDataSource] });

app.use(bodyParser.json());
app.use("/graphql", graphqlExpress(GraphQLOptions));
app.use("/graphiql", graphiqlExpress({ endpointURL: "/graphql" }));

startServer(app);

2-examplequery.graphql

{
  getVal
}

3-exampleoutput.json

{
  "data": {
    "getVal": "value!"
  }
}