I have created a codegen library which generates wrappers fo

Question

I have created a codegen library which generates wrappers for coroutines and flows Heavily inspired by < russhwolf> s article about SuspendWrappers This is an early preview a lot will change I d appreciate your feedback and sincerely hope this will become useful for the community

russhwolf · Answer

Neat

russhwolf · Answer

At some point I want to dig in and understand your scope handling better That always felt like something that could use a bit of cleanup in the original post I optimized the description in the post for maximum flexibility but if you always use the same scope in practice then you can just have it live inside the ` Ios` wrapper class and don t need to pass it in externally

Michal Klimczak · Answer

At first I was planning to use a new scope for every suspendwrapper and handle cancelling them at the right moment But I wasn t sure if I would not leak them in some scenario Providing the same scope from the outside with possibility to override it if necessary seems like an good solution to me but I m open for other ideas

John O&apos;Reilly · Answer

Would love to see this or some variation of it become part of Kotlin Native itself

Michal Klimczak · Answer

Yeah the way that suspend functions are converted right now is far from flexible no way to write an extension if there is no return type but a completion handler as the last parameter instead

ankushg · Answer

Looks great Do `SuspendWrapper`s or `FlowWrapper`s provide a way for iOS clients to cancel I liked that aspect of the helpers exposed by the kotlinconf app <https github com JetBrains kotlinconf app blob d56c3383d52dfdc32ba449d8daf9b9f633dd1d08 common src mobileMain kotlin org jetbrains kotlinconf FlowUtils kt L22|https github com JetBrains kotlinconf app blob d56c3383d52dfdc32ba449d8daf9b9f63 mon src mobileMain kotlin org jetbrains kotlinconf FlowUtils kt>

Michal Klimczak · Answer

It can be canceled via the provided scope but then of course you need to provide it explicitly This requires some more thought

russhwolf · Answer

I didn t look closely at it here but in my original article the `subscribe` calls return `Job`s that you can use to cancel in addition to scopes

John O&apos;Reilly · Answer

that s also same approach I used in <https johnoreilly dev posts kotlinmultiplatform swift combine publisher flow >

John O&apos;Reilly · Answer

not too surprisingly given it was also heavily based on < russhwolf> s code slightly smiling face

russhwolf · Answer

re built ins part of the issue is the language level coroutine constructs don t expose cancellation It only lives in the the kotlinx dependency So I think the closest you d ever get to a built in for this stuff is a kotlinx coroutines module that includes it ideally including a compiler plugin for code gen something like this one

ankushg · Answer

Yeah it would be nice if the `subscribe` call returned an object to cancel the operation even in the automatically provided scope case I m not sure if exposing a full `Job` is the right approach or not it looks like JB just return an implementation of `Closeable` that calls `Job cancel` behind the scenes Regardless this is a super cool proof of concept smile

Michal Klimczak · Answer

Oh wait I forgot that you can cancel this way This is almost copied from < russhwolf> solution It returns a Job and it can be canceled that way of course not just via scope I even do that in my Swift code where I make Combine Publisher from SuspendWrapper will provide more docs on that

ankushg · Answer

Oh nice Looking forward to seeing an example of this in action

Andrea Prearo · Answer

It d be great to have a standardized way to consume coroutines and Kotlin Flows in iOS So far this has been a tricky aspect of working with KMP I agree with < John O Reilly> that something like this should be provided as part of Kotlin Native itself

Michal Klimczak · Answer

Not sure about kotlin itself but Android has a long history of incorporating community solutions And KMM KMP evolves rapidly so who knows