v3 introduces some regression if it comes to `parameters` description

[derberg]

In short, no more JSON schema for parameters in v3 -> https://github.com/asyncapi/spec/blob/next-major-spec/spec/asyncapi.md#user-content-parameter-object

But I just discovered one example that actually uses pattern keyword from JSON schema -> https://github.com/asyncapi/spec/blob/master/examples/rpc-client.yml#L21

• Now, it is not something that I see in a production use cases, just one of our examples
• Also, affected users might be not many

I think that the impact is small, will not affect adoption and it is completely fine if we add it v3.1

But I want to make sure other codeowners don't see a problem

cc codeowners @fmvilas @dalelane @smoya @char0n

fyi @jonaslagoni

[fmvilas]

Yeah, can be added in v3.1.

[smoya]

First, i want to say thanks @derberg for catching this 🙌🙌.

Now, it is not something that I see in a production use cases

I'm completely not sure about this statement to be true.
I can share a valid use case where SRE department could share just one asyncapi.yaml file with each team who owns channels (lets say rabbitmq or kafka topics) but not documenting all of them one by one but rather using a pattern in the address. I.e. ^team_a\\..+$ or similar pattern.

Having said that, I'm not pretty confident about this causing a low impact in case this feature is missing in v3.0.0.

Im not blocking but just want to know from you if you have sources to confirm this is a really edge case.

[jonaslagoni]

We have seen similar raised question on slack as well, where people where no longer able to define that the parameter for example should be an integer.

[fmvilas]

It's low impact because it's on 2.6.0. I mean, it's not that some people can't continue using AsyncAPI, it's just that they won't be able to adopt 3.0.0, which is ok. They can adopt 3.1.0, which can be released as soon as January 2024.

[smoya]

It's low impact because it's on 2.6.0. I mean, it's not that some people can't continue using AsyncAPI, it's just that they won't be able to adopt 3.0.0, which is ok. They can adopt 3.1.0, which can be released as soon as January 2024.

Yes, that's clear enough I would say the only factor that makes me 👍 is that we are gonna add it in the very next minor version.
I was asking, if by any chance, we know real use cases from companies that would be affected. Just to know the impact a bit better.

Another topic is the generator-js. It would be awesome to throw some warnings when a parameter from v2 is not supported in v3. However, I do not see we do that atm, we do not log any line or return some diagnostics but rather the transformed doc. Can we maybe add somewhere some logic that adds a commented line in the final document for each unsupported parameter saying this will be or not supported soon? cc @jonaslagoni

[jonaslagoni]

Another topic is the generator-js. It would be awesome to throw some warnings when a parameter from v2 is not supported in v3. However, I do not see we do that atm, we do not log any line or return some diagnostics but rather the transformed doc. Can we maybe add somewhere some logic that adds a commented line in the final document for each unsupported parameter saying this will be or not supported soon? cc @jonaslagoni

Do you mean the converter? If so, we already do give the user information about this in the form of a warning 🙂

[derberg]

Now, it is not something that I see in a production use cases, just one of our examples

@smoya I mean't I haven't seen any production-used asyncapi document that would use pattern. I just noticed we have it in one of our examples. This is why I agree to not push to solve this regression in 3.0

Can we maybe add somewhere some logic that adds a commented line in the final document for each unsupported parameter saying this will be or not supported soon? cc @jonaslagoni

@smoya what you mention is addressed in asyncapi/converter-js#192 by @jonaslagoni

@jonaslagoni did you remember to add it to migration guide?

[jonaslagoni]

@jonaslagoni did you remember to add it to migration guide?

@derberg doing it today yea 👍

[GreenRover]

+1

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[ly29]

Just to chime in that we use patters for various parameters that are more open in our channel (topic) structure. No being able to document them is regression. 2.6.0 works fine but yes it is used in production.

[SebastienGllmt]

Even if the parameter are all strings in practice for codegen simplicity, it would be good to at least have some kind of docHint field where you can specify the full type

example

parameters:
    streetlightId:
        docHint:
            type: integer

This would allow you to keep enforcing only strings for the parameters, but allow more complex types in tools like the AsyncApi Studio

[viettappcard]

Hey, chiming in with what @SebastienGllmt mentioned. I've already posted in the Slack as well but essentially:

Let's say I have a channel route /device/{deviceId}/send where deviceId is always an integer. I want to express in the documentation that a deviceId can only be an integer, but with AsyncAPI 3.0.0 restricting the parameter object, I can't.

1. parameter must be of type string
2. pattern would be useful here but it's not available

Unfortunately, I have a real person who read the generated html docs and they are — rightfully — confused on what is the type for deviceId when what they sees is a prominent azure-green colored String instead of the expected Integer.

components:
  parameters:
    deviceId:
      description: The ID of the device. must be an integer.

PS: I'm advocating for AsyncAPI usage in the company, they're a higher up, and it's a little awkward to come back and say "hey hey, looks like it's just a limitation of AsyncAPI in this version, hopefully it'll be fixed later" (but like in hopefully nicer than I can say here 😄 )