private var mDatabase: FirebaseDatabase = FirebaseDatabase.getInstance()

    fun createNewUser(uid: String, user: User): Completable {
        try {
            val userReference: DatabaseReference = mDatabase.getReference("users").child(uid)
            userReference.child("mail").setValue(user.mail)
            userReference.child("name").setValue(user.name)
            userReference.child("surname").setValue(user.surname)
            userReference.child("gender").setValue(user.gender)
            userReference.child("age").setValue(user.age)
        }
        catch (e: IOException){
            return Completable.error(e)
        }
        return Completable.complete()
    }

    fun getCurrentUserInfo(uid: String): Single<User>{
        return Single.create<User> { singleEmitter ->
                try {
                    val userReference: DatabaseReference = mDatabase.getReference("users").child(uid)
                    userReference.addListenerForSingleValueEvent(object: ValueEventListener {
                        override fun onCancelled(databaseError: DatabaseError) {
                            throw Exception(databaseError.message)
                        }

                        override fun onDataChange(dataSnapshot: DataSnapshot) {
                            val mail: String = dataSnapshot.child("mail").value.toString()
                            val name = dataSnapshot.child("name").value.toString()
                            val surname = dataSnapshot.child("surname").value.toString()
                            val gender = dataSnapshot.child("gender").value.toString()
                            val age = dataSnapshot.child("age").value.toString().toInt()

                            singleEmitter.onSuccess(User(mail, name, surname, gender, age))
                        }
                    })
                }
                catch (e: Exception){
                    singleEmitter.onError(e)
                }
        }
    }

//вызовы

 firebaseAuthenticationWorker.signUpNewUser(user.mail, password)
                        .subscribeOn(Schedulers.io())
                        .observeOn(AndroidSchedulers.mainThread())
                        .flatMapCompletable { it -> firebaseRealtimeDatabaseWorker.createNewUser(it, user) }
                        .subscribe(
                                {
                                    view?.registeredSuccessfully()
                                },
                                {
                                    error -> view?.showError(error.message)
                                }
                        )

val uid = FirebaseAuthenticationWorker().getCurrentUserUid()
        firebaseRealtimeDatabaseWorker.getCurrentUserInfo(uid!!)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(
                        {
                        data -> view?.showUserInfo(data)
                        },
                        {
                            error -> view?.showError(error.message)
                        }
                )