Wrapping the service API at the price of boiler-plate code

func observableRequest(arg1: String, arg2: Int) -> Observable<String> {
    return Observable.create { (observer) -> Disposable in
        request(arg1: arg1, arg2: arg2, completionHandler: { result in
            observer.onNext(result)
            observer.onCompleted()
        })
        
        return Disposables.create()
    }
}