With Ktor Server how is a binary file read from the request kotlinlang #ktor

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napperley

08/18/2022, 3:03 AM

With Ktor Server how is a binary file read from the request body?

Tóth István Zoltán

08/18/2022, 4:19 AM

val bytes = ByteArray(length)
call.receiveChannel().readFully(bytes, 0, length)

This reads everything into a byte array which is fine if your upload limit is small. You can use the channel to read chunks if the upload is bigger. Taken this example from: https://github.com/spxbhuhb/zakadabar-stack/blob/master/lib/blobs/src/jvmMain/kotlin/zakadabar/lib/blobs/business/BlobBlBase.kt

napperley

08/18/2022, 5:12 AM

@Aleksei Tirman [JB] - The Ktor Server documentation is missing a section on reading binary data from a HTTP request body.

I found this code example by accident which covers reading the binary data (in chucks) from a HTTP response body 😄: https://github.com/Kotlin/kotlinx-io/issues/41#issuecomment-469137967 Luckily the code example can be adapted to work with an HTTP request body instead.

Here is what I have used in my project: https://gitlab.com/data-conduit/conduit-server/-/blob/master/src/linuxX64Main/kotlin/org.dataConduit.conduitServer/controller.kt#L17

Aleksei Tirman [JB]

08/18/2022, 6:49 AM

I’ve created an issue about documentation.

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