Support for CloudEvents requests

[resamaraschi]

I am working on an integration of a DBOS app with Dapr runtime. Dapr subpub building block transmits the message as a so called Envelope in the body of POST request with Content-Type header set to application/cloudevents+json" (see 1).

Currently the instantiated koa bodyparser in dbos-sdk, does not provide a way of extending allowed Content-Types, thus the body of HandlerContext.request.body is empty after it was parsed. In other words the DBOS endpoint can only work with request with a Content-Type listed here

Since the current version of dbos-ts relies heavily on http request to trigger a workflow, it would be important to provide more configuration for involved koa components such as bodyparser:

For instance in server.ts

    this.app.use(bodyParser({
        "extendTypes": {
            // will parse application/cloudevents+json type body as a JSON string
            json: ["application/cloudevents+json"],
          }
    }));

Unfortunately I am not a TypeScript developer, otherwise, I would have contributed with a PR. :)

Thanks

[kraftp]

Thanks for filing this issue! We now have a PR enabling custom body-parsing middleware: #353

Is this what you had in mind?

[resamaraschi]

Yes it is. Many thanks :)

[kraftp]

Fixed through the @KoaBodyParser decorator in #353, which adds support for fully custom body parsers.

If you want to try it out now, install our preview build: npm i @dbos-inc/dbos-sdk@preview. Otherwise, this will be included in our next release next week.