Daml-ui-template: use a different JSON API instance for each party

Questions
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2

Rather than having the client route the requests to the correct server, would it not be better to write a custom API server that takes a JSON API call and proxies the call to the right JSON API server?

                                /----- [JSON API server A]
[frontend] ------- [API server] ------ [JSON API server B]
                                \----- [JSON API server C]

The proxy server would need to:

  • Extract the DAML party from the request. This can be either done by inspecting the JWT token, or the DAML React Component could be extended to include a custom HTTP header for this.
  • Know what participant each party is hosted on.
  • Proxy the call to the right JSON API server. I’m sure each language has libraries to do so easily. Node.js has express-http-proxy, for example.

This also sounds similar to Running multiple instances of create-daml-app simultaneously against multiple participants. @Phoebe_Nichols, how did you solve this for your “run create-daml-app on Canton” tutorial?

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