diff options
Diffstat (limited to 'wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt')
-rw-r--r-- | wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt b/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt new file mode 100644 index 0000000..c4ab785 --- /dev/null +++ b/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt @@ -0,0 +1,83 @@ +/* + * 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 <http://www.gnu.org/licenses/> + */ + +package net.taler.wallet.transactions + +import androidx.lifecycle.LiveData +import androidx.lifecycle.MutableLiveData +import androidx.lifecycle.asLiveData +import androidx.lifecycle.switchMap +import com.fasterxml.jackson.databind.ObjectMapper +import com.fasterxml.jackson.module.kotlin.readValue +import kotlinx.coroutines.Dispatchers +import kotlinx.coroutines.channels.awaitClose +import kotlinx.coroutines.flow.callbackFlow +import kotlinx.coroutines.flow.onCompletion +import kotlinx.coroutines.flow.onStart +import kotlinx.coroutines.launch +import net.taler.wallet.backend.WalletBackendApi + +sealed class TransactionsResult { + object Error : TransactionsResult() + class Success(val transactions: Transactions) : TransactionsResult() +} + +@Suppress("EXPERIMENTAL_API_USAGE") +class TransactionManager( + private val walletBackendApi: WalletBackendApi, + private val mapper: ObjectMapper +) { + + private val mProgress = MutableLiveData<Boolean>() + val progress: LiveData<Boolean> = mProgress + + val showAll = MutableLiveData<Boolean>() + + var selectedEvent: Transaction? = null + + val transactions: LiveData<TransactionsResult> = showAll.switchMap { showAll -> + loadTransactions(showAll) + .onStart { mProgress.postValue(true) } + .onCompletion { mProgress.postValue(false) } + .asLiveData(Dispatchers.IO) + } + + private fun loadTransactions(showAll: Boolean) = callbackFlow { + walletBackendApi.sendRequest("getHistory", null) { isError, result -> + launch(Dispatchers.Default) { + if (isError) { + offer(TransactionsResult.Error) + close() + return@launch + } + val transactions = Transactions() + val json = result.getJSONArray("history") + for (i in 0 until json.length()) { + val event: Transaction = mapper.readValue(json.getString(i)) + event.json = json.getJSONObject(i) + transactions.add(event) + } + transactions.reverse() // show latest first + val filtered = + if (showAll) transactions else transactions.filter { it.showToUser } as Transactions + offer(TransactionsResult.Success(filtered)) + close() + } + } + awaitClose() + } + +} |