Kotlinx.serialization: Add support for Kotlin/Native

[jonasfranz]

Since Kotlin/Native 0.6 supports multiplattform projects, it would be nice to have also support for kotlin native.

https://blog.jetbrains.com/kotlin/2018/02/kotlinnative-v0-6-is-here/

[sandwwraith]

Yes, Kotlin/Native support is in our plan and we've already started working at it :)

[rytedesigns]

Is there an eta on Kotlin/Native support?

[arnestockmans]

@sandwwraith I'm also curious about an ETA on kotlin/native support

[sandwwraith]

@rytedesigns @Arne517 there is a K/N compatible version of this library, but the compiler plugin API is not available on Native yet. To try it out (remember, this is early preview), there are two options:

• Use sourcegen branch and Kotlin source generator from there, which uses DSL to generate data classes with serializers compatible with library (see example-sourcegen folder and its buildSrc)
• Use json-ast branch and jsonparser native module, which contains JSON parser and JSON tree model (but can't map it on data classes yet)

[AndreasBackx]

@sandwwraith is there an update you could give on K/N support? We're looking at some options for managing APIs on Android and iOS using K/N. Where could we follow the support for the compiler plugin API on Native?

[sandwwraith]

@AndreasBackx no updates on compiler plugin for now :(

[nish-d]

https://blog.jetbrains.com/kotlin/2018/07/kotlinnative-v0-8-released/

According to this kotlinx.serialization is now supported with kotlin/native. But I am still unable to use this.

[sandwwraith]

@nish-d Support for native is limited for now and expressed as separate JSON parser. We are working in this direction.

[sandwwraith]

I'd like to announce an early access preview of kotlinx.serialization plugin for Native. The showcase project can be found at https://github.com/sandwwraith/KotlinSerializationPlayground/tree/native_preview/ . Some rules of thumb:

• Works with Kotlin/Native 0.9-dev-3770
• Version of kotlinx.serialization plugin must be 0.7.0-eap-1, serialization runtime library 0.7.0-eap-3.
• Kotlin version is 1.3-M2
  > These versions will be updated with every release, see corresponding gradle.properties for actual information
• Kotlin Native Gradle plugin does not support compiler plugins yet, passing plugin option to compiler must be performed manually (see https://github.com/sandwwraith/KotlinSerializationPlayground/blob/native_preview/native/build.gradle#L40 , note the -unshaded suffix in maven coordinates).
• Internal kotlinx.serialization API has been significantly changed to match corresponding KEEP, sources for 0.7.X build can be found in branch core_refactoring.

What works:

• @Serializable classes with primitive or @Serializable properties
• Standard collections
• @Optional and @SerialName annotations

What does not work:

• @Serializable classes with generics (except standard collections)
• Enums and arrays (Array<T>, ByteArray, etc)
• @Transient initializers and init blocks
• @SerialInfo-based annotations

[nish-d]

The showcase project has different version numbers than what you have mentioned.

[sandwwraith]

@nish-d I can see correct versions: https://github.com/sandwwraith/KotlinSerializationPlayground/blob/native_preview/gradle.properties#L1
(notice that showcase project with native is located in native_preview branch, not master)

[daudrain]

@sandwwraith In SerialImplicits.kt, it is noted that the code won't work with kotlin/native.
Does that mean protocolbuffer serialization/deserialization is not available yet for kotlin-native?

[sandwwraith]

@daudrain It is available, but without the possibility to specify custom serial ids – all properties are enumerated in order starting from 1.

[sandwwraith]

kotlinx.serialization plugin for native has been feature-complete for several latest releases, so I think this may be closed now. 🎉