@greenwood/cli/src/lib/api-route-worker.js

Greenwood CLI.

// https://github.com/nodejs/modules/issues/307#issuecomment-858729422
import { parentPort } from "worker_threads";
import { transformKoaRequestIntoStandardRequest } from "./resource-utils.js";

// based on https://stackoverflow.com/questions/57447685/how-can-i-convert-a-request-object-into-a-stringifiable-object-in-javascript
async function responseAsObject(response) {
  if (!(response instanceof Response)) {
    throw Object.assign(new Error(), {
      name: "TypeError",
      message: "Argument must be a Response object",
    });
  }
  response = response.clone();

  function stringifiableObject(obj) {
    const filtered = {};
    for (const key in obj) {
      if (["boolean", "number", "string"].includes(typeof obj[key]) || obj[key] === null) {
        filtered[key] = obj[key];
      }
    }
    return filtered;
  }

  return {
    ...stringifiableObject(response),
    headers: Object.fromEntries(response.headers),
    body: await response.text(),
  };
}

async function executeRouteModule({ href, request }) {
  const { body, headers = {}, method, url } = request;
  const contentType = headers["content-type"] || "";
  // @ts-expect-error see https://github.com/microsoft/TypeScript/issues/42866
  const { handler } = await import(new URL(href));
  const format = contentType.startsWith("application/json") ? JSON.parse(body) : body;

  // handling of serialized FormData across Worker threads
  if (contentType.startsWith("x-greenwood/www-form-urlencoded")) {
    headers["content-type"] = "application/x-www-form-urlencoded";
  }

  const response = await handler(
    transformKoaRequestIntoStandardRequest(new URL(url), {
      method,
      header: headers,
      body: format,
    }),
  );

  parentPort.postMessage(await responseAsObject(response));
}

parentPort.on("message", async (task) => {
  await executeRouteModule(task);
});