An extension for Retorfit's Call<T> to wrap it into a suspended fun

CallExt.kt

suspend fun <T> Call<T>.await(): T = suspendCancellableCoroutine { cont ->
    cont.invokeOnCompletion { cancel() }
    enqueue(object : Callback<T> {
        override fun onFailure(call: Call<T>, t: Throwable) {
            cont.resumeWithException(t)
        }

        override fun onResponse(call: Call<T>, response: Response<T>) {
            if (response.isSuccessful) {
                cont.resume(response.body()!!)
            } else {
                cont.resumeWithException(HttpException(response))
            }
        }
    })
}