I created a multiplatform library Integration with iOS went kotlinlang #ktor

I created a multiplatform library. Integration with iOS went smoother than expected. On Android, seeing a bunch of exceptions one after another. Added a few dependencies that were added to the multiplatform lib. Do I really have to add indirect dependencies? Most importantly, I am getting an exception.

Engine doesn't support WebsocketCapability.

Can I not use sockets in the multiplatform library? IMO it should support.

Norbi

05/05/2023, 11:56 AM

You can, just choose an engine which supports websockets. https://ktor.io/docs/http-client-engines.html#limitations

Do I really have to add indirect dependencies?

What do you mean? In a library you should not add concrete engine dependencies but use the core ktor libraries instead (ktor-server-core, ktor-client-core, etc). The users of your library will choose a preferred engine (of course with some limitations like if your library uses websockets then the chosen engine should support it of course).

Vivek Mittal

05/05/2023, 2:06 PM

This was super helpful. Thanks.

About the dependencies - App A uses a kmm library B, which uses C & D libraries (gradle dependencies). When A integrates B, it also needs to add C & D in the gradle dependencies. Correct? In c# or cocoapods world, B needs C & D, but it automatically brings them.

Norbi

05/05/2023, 2:52 PM

When A integrates B, it also needs to add C & D in the gradle dependencies. Correct?

Only if B declares C & D as

imlementation()

dependencies. If B declares C & D as

api()

dependencies then C & D will be automatically available in A as well:

// build.gradle.kts of B

kotlin {
    sourceSets {
        val commonMain by getting {
            dependencies {
                api("C")
                api("D")
            }
        }
    }
}

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