flight-path/examples/graphql/src/index.js

Express style router for Fastly Compute@Edge

import { Router } from "../../../dist/index.js";
import {
  getGraphQLParameters,
  processRequest,
  renderGraphiQL,
  shouldRenderGraphiQL,
  sendResult,
} from "graphql-helix";
import { schema } from "./schema";
import FPRequest from "../../../dist/lib/routing/request.js";

const router = new Router();

router.use("*", async (req, res) => {
  let body = {};

  try {
    body = await req.json();
  } catch (e) {}

  // Create a generic Request object that can be consumed by Graphql Helix's API
  const request = {
    body: body,
    headers: req.headers,
    method: req.method,
    query: req.query,
  };

  // Determine whether we should render GraphiQL instead of returning an API response
  if (shouldRenderGraphiQL(request)) {
    res.send(renderGraphiQL());
  } else {
    // Extract the Graphql parameters from the request
    const { operationName, query, variables } = getGraphQLParameters(request);

    // Validate and execute the query
    const result = await processRequest({
      operationName,
      query,
      variables,
      request,
      schema,
    });

    // processRequest returns one of three types of results depending on how the server should respond
    // 1) RESPONSE: a regular JSON payload
    // 2) MULTIPART RESPONSE: a multipart response (when @stream or @defer directives are used)
    // 3) PUSH: a stream of events to push back down the client for a subscription
    // The "sendResult" is a NodeJS-only shortcut for handling all possible types of Graphql responses,
    // See "Advanced Usage" below for more details and customizations available on that layer.
    sendResult(result, res);
  }
});

router.listen();