class SessionRepository() : SessionRepositoryInterface {
    val environment: BehaviorRelay<String> = BehaviorRelay.create()

    override fun getModules(): Single<Module> {
        //// before getModules is called, set isLoading=true in the view
        //isLoading.onNext(true)

        val request = createRetrofit<Api>()

        return request.getModules()
            .driveOnUI()
            .onErrorReturn { Module(null, null, null) }
            .doFinally {
                //call in the view isLoading.onNext(false) }
            }
    }