/* * This file is part of GNU Taler * (C) 2020 Taler Systems S.A. * * GNU Taler is free software; you can redistribute it and/or modify it under the * terms of the GNU General Public License as published by the Free Software * Foundation; either version 3, or (at your option) any later version. * * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR * A PARTICULAR PURPOSE. See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along with * GNU Taler; see the file COPYING. If not, see */ package net.taler.wallet.transactions import androidx.annotation.UiThread import androidx.annotation.WorkerThread import androidx.lifecycle.LiveData import androidx.lifecycle.MutableLiveData import androidx.lifecycle.switchMap import com.fasterxml.jackson.databind.ObjectMapper import com.fasterxml.jackson.module.kotlin.readValue import kotlinx.coroutines.CoroutineScope import kotlinx.coroutines.Dispatchers import kotlinx.coroutines.launch import net.taler.wallet.backend.WalletBackendApi import net.taler.wallet.getErrorString import org.json.JSONObject import java.util.HashMap import java.util.LinkedList sealed class TransactionsResult { class Error(val msg: String) : TransactionsResult() class Success(val transactions: List) : TransactionsResult() } class TransactionManager( private val walletBackendApi: WalletBackendApi, private val scope: CoroutineScope, private val mapper: ObjectMapper ) { private val mProgress = MutableLiveData() val progress: LiveData = mProgress var selectedCurrency: String? = null var selectedTransaction: Transaction? = null val searchQuery = MutableLiveData(null) private val allTransactions = HashMap>() private val mTransactions = HashMap>() val transactions: LiveData @UiThread get() = searchQuery.switchMap { query -> val currency = selectedCurrency check(currency != null) { "Did not select currency before getting transactions" } loadTransactions(query) mTransactions[currency]!! // non-null because filled in [loadTransactions] } @UiThread fun loadTransactions(searchQuery: String? = null) { val currency = selectedCurrency ?: return val liveData = mTransactions.getOrPut(currency) { MutableLiveData() } if (searchQuery == null && allTransactions.containsKey(currency)) { liveData.value = TransactionsResult.Success(allTransactions[currency]!!) } if (liveData.value == null) mProgress.value = true val request = JSONObject(mapOf("currency" to currency)) searchQuery?.let { request.put("search", it) } walletBackendApi.sendRequest("getTransactions", request) { isError, result -> if (isError) { liveData.postValue(TransactionsResult.Error(getErrorString(result))) mProgress.postValue(false) } else { val currencyToUpdate = if (searchQuery == null) currency else null scope.launch(Dispatchers.Default) { onTransactionsLoaded(liveData, currencyToUpdate, result) } } } } @WorkerThread private fun onTransactionsLoaded( liveData: MutableLiveData, currency: String?, // only non-null if we should update all transactions cache result: JSONObject ) { val transactionsArray = result.getString("transactions") val transactions: LinkedList = mapper.readValue(transactionsArray) // TODO remove when fixed in wallet-core transactions.sortWith(compareBy({ it.pending }, { it.timestamp.ms }, { it.transactionId })) transactions.reverse() // show latest first mProgress.postValue(false) liveData.postValue(TransactionsResult.Success(transactions)) // update all transactions on UiThread if there was a currency currency?.let { scope.launch(Dispatchers.Main) { allTransactions[currency] = transactions } } } }