In the `SimplifiedSessionStorage` example on <https://ktor.io/servers/features/sessions/storages.htm...

# ktor

[mp]

In the SimplifiedSessionStorage example on https://ktor.io/servers/features/sessions/storages.html, what is the (not shown) getCoroutineContext() supposed to do in practice? Also that form of reader() is deprecated now -- CoroutineScope.reader is probably what it should be, but on what scope?

[Deactivated User]

That looks like outdated

[Deactivated User]

There is an intrinsic called coroutineContext that should replace the getCoroutineContext

[Deactivated User]

About the reader part, let me check

[mp]

that makes much more sense

[Deactivated User]

yeah I have still to revisit every single page now that Kotlin 1.3 and kotlinx.coroutines 1.0.0 are released and are stable (and Ktor is almost there)

[mp]

we appreciate the effort put into the docs 🙂

[mp]

Maybe I'm missing something about coroutine scopes (quite plausible) but it seems like this should be attached to the scope of a call, but how would that scope make its way down to this level if it's not passed as an argument to SessionStorage methods?

[Deactivated User]

CoroutineScope(<http://Dispatchers.IO|Dispatchers.IO>) ?

[Deactivated User]

No scope is propagated

[Deactivated User]

https://github.com/ktorio/ktor/blob/06a0c5e70688277df32dcd6c7a6deff30561409d/ktor-features/ktor-server-sessions/src/io/ktor/sessions/DirectoryStorage.kt#L40

[Deactivated User]

https://github.com/ktorio/ktor/blob/06a0c5e70688277df32dcd6c7a6deff30561409d/ktor-utils/ktor-utils-jvm/src/io/ktor/util/cio/FileChannels.kt#L24-L28

[Deactivated User]

so right now it is not attached

[mp]

I see. I'm still pretty fuzzy on how best to use scopes, but CoroutineScope(Dispatchers.IO) seems defensible

[Deactivated User]

but it is really necessary that it is attached? Since those I/O stuff should be short and usually request/response, or even long lived

[mp]

I'm not really sure

[Deactivated User]

but I don’t have a strong opinion on this either

[mp]

I just want the IDE to not be mad at me 😉

[Deactivated User]

🙂