Author

James M Snell <jasnell@gmail.com> 2024-09-16 19:23:02 -0700

Parents

695b0b4

Tree

23b034d

Patch v8 to support promise cross-context resolution

```
export default {
  async fetch(req, env, ctx) {
    if (globalThis.resolve === undefined) {

      {
        const { promise, resolve } = Promise.withResolvers();
        setTimeout(resolve, 1000);
        ctx.waitUntil(promise);
      }

      // This is our first request. We will create a new promise and resolver
      // pair and store it in a global. This request will then wait for the
      // promise to be resolved before continuing.
      const { promise, resolve } = Promise.withResolvers();
      globalThis.resolve = resolve;
      globalThis.promise = promise;
      const ab = AbortSignal.abort();
      console.log(ab.aborted);
      promise.then(() => {
        // This will be run within the correct IoContext now...
        try {
          console.log('test1', ab.aborted);
        } catch (err) {
          // We would get here if the IoContext was incorrect because
          // of the call to ab.aborted
          console.log(err.message);
        }
      });
    } else {
      // This is our second request. We will resolve the promise created in the
      // first request.
      console.log('....');
      globalThis.resolve();
      globalThis.resolve = undefined;
      console.log('test2');
    }

    return new Response("Hello World\n");
  }
};

```