Hi Kodeiners, :wave: (Shared module) I have multi...

# kodein

[Alper Tekin]

Hi Kodeiners, 👋

(Shared module) I have multi-module backend architecture and created an HttpClient as singleton as below:

bindSingleton() { HttpClient(CIO) }

(Auth module) then I set authentication token to the header using the singleton instance

val client: HttpClient by closestDI().instance()
 client.config {
            defaultRequest {
                headers.append(HttpHeaders.Authorization, "$schemes $token")
            }

(User module) Also, I have http clients that talk to each other in microservices. But it looks like I can’t set auth token to the same instance, no token is set in the header for the client below.

private val client: HttpClient by instance()

Kodein: 7.11.0

WDYT? Any suggestion?

[romainbsl]

client.config { } return a new instance of HttpClient, so you will need to manage a new instance in your Auth module, or you could replace your singleton by a factory/multiton depending on a generic config that could carry your auth.

[Alper Tekin]

🤦‍♂️ thank you, I’ll try to change it to multiton

[Alper Tekin]

@romainbsl I’ve changed it to multiton but now it says “No binding found for HttpClient on context UserClientImpl”, I didn’t have the error when it was singleton.

Here is my multiton binding:

fun Application.service(test: Boolean) = DI.Module("service") {
    bindMultiton<String, HttpClient> { token -> createHttpClient(!test, token) }
...
}

fun createHttpClient(consul: Boolean, token: String) = HttpClient(CIO) {
...
 defaultRequest {
    headers.append(HttpHeaders.Authorization, "Bearer $token")
    }

and I set token in my auth module as

closestDI().instance<String, HttpClient>(arg = token)

here is my userClient module

val userClient
    get() = DI.Module("userClient") {
        bind<UserClient>() with singleton { UserClientImpl(di) }
    }

and this is how I call the instance:

class UserClientImpl(
    override val di: DI
) : DIAware, UserClient {

    private val client: HttpClient by instance()
...
}

[romainbsl]

this code does not “update” to your client instance:
closestDI().instance<String, HttpClient>(arg = token)

[romainbsl]

What you should do is
private val client: HttpClient by instance(arg = token)
thus DI will create an instance of your HttpClient with the given token

[romainbsl]

that being said, you should consider using http client interceptor to fulfil your request with such information like tokens / headers and so on