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/*
* 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.lib.wallet
import kotlinx.coroutines.sync.Mutex
import kotlinx.coroutines.sync.withLock
import net.taler.lib.wallet.exchange.DenominationRecord
import net.taler.lib.wallet.exchange.ExchangeRecord
internal interface Db {
suspend fun put(exchange: ExchangeRecord)
suspend fun listExchanges(): List<ExchangeRecord>
suspend fun getExchangeByBaseUrl(baseUrl: String): ExchangeRecord?
suspend fun deleteExchangeByBaseUrl(baseUrl: String)
suspend fun put(denomination: DenominationRecord)
suspend fun getDenominationsByBaseUrl(baseUrl: String): List<DenominationRecord>
suspend fun <T> transaction(function: suspend Db.() -> T): T
}
internal expect class DbFactory() {
fun openDb(): Db
}
internal class FakeDb : Db {
private data class Data(
val exchanges: HashMap<String, ExchangeRecord> = HashMap(),
val denominations: HashMap<String, ArrayList<DenominationRecord>> = HashMap()
)
private var data = Data()
private val mutex = Mutex(false)
override suspend fun put(exchange: ExchangeRecord) {
data.exchanges[exchange.baseUrl] = exchange
}
override suspend fun listExchanges(): List<ExchangeRecord> {
return data.exchanges.values.toList()
}
override suspend fun getExchangeByBaseUrl(baseUrl: String): ExchangeRecord? {
return data.exchanges[baseUrl]
}
override suspend fun deleteExchangeByBaseUrl(baseUrl: String) {
data.exchanges.remove(baseUrl)
}
override suspend fun put(denomination: DenominationRecord): Unit = mutex.withLock("transaction") {
val list = data.denominations[denomination.exchangeBaseUrl] ?: {
val newList = ArrayList<DenominationRecord>()
data.denominations[denomination.exchangeBaseUrl] = newList
newList
}()
val index = list.indexOfFirst { it.denomPub == denomination.denomPub }
if (index == -1) list.add(denomination)
else list[index] = denomination
}
override suspend fun getDenominationsByBaseUrl(baseUrl: String): List<DenominationRecord> {
return data.denominations[baseUrl] ?: emptyList()
}
override suspend fun <T> transaction(function: suspend Db.() -> T): T = mutex.withLock("transaction") {
val dataCopy = data.copy()
return@withLock try {
function()
} catch (e: Throwable) {
data = dataCopy
throw e
}
}
}
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