Callback-like paradigm for http.Server

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#Callback-like paradigm for http.Server

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Tony 08/19/2024 08:35 PM

I am building off of the http.Server examples, but I cannot figure out the idiomatic way to handle something like a callback. I'd like to define a function like this:

start-server [--on-open] [--on-close] [--on-message]:
  ...
  server.listen server-socket :: | request/http.RequestIncoming writer/http.ResponseWriter |
    ...

But I cannot use the the passed in blocks (eg, --on-open) inside the lambda passed to server.listen.

What is the idiomatic way to do this in Toit?

Tony 08/19/2024 08:38 PM

Maybe define an interface and pass the object to start-server?

Tony 08/19/2024 08:48 PM

It's not what the functional part of me wants to write, but it does seem workable.

bitphlipphar 08/20/2024 06:25 AM

You can use a lambda instead of a block. The server.listen call takes two arguments, the last one is a lambda.

bitphlipphar 08/20/2024 06:25 AM

So change --on-open to take a lambda instead, perhaps?(edited)

bitphlipphar 08/20/2024 06:26 AM

start-server --on-open/Lambda --on-close/Lambda --on-message/Lambda:

Tony 08/20/2024 06:27 PM

Thank you for the suggestion. I might give that a try later, but I am OK with the version I ended up with: https://github.com/anthonyjclark/cs181r/blob/main/_toit/communication/communication.toit

I did not find documentation on creating lambdas, so I took that lack of documentation as a recommendation to find a different approach.

7 messages in total