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/*
* This file is part of LibEuFin.
* Copyright (C) 2023 Taler Systems S.A.
* LibEuFin is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation; either version 3, or
* (at your option) any later version.
* LibEuFin 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 Affero General
* Public License for more details.
* You should have received a copy of the GNU Affero General Public
* License along with LibEuFin; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>
*/
package tech.libeufin.bank.db
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.first
import kotlinx.coroutines.launch
import kotlinx.coroutines.withTimeoutOrNull
import org.slf4j.Logger
import org.slf4j.LoggerFactory
import tech.libeufin.bank.*
import tech.libeufin.common.*
import java.sql.PreparedStatement
import java.sql.ResultSet
import java.sql.Types
import kotlin.math.abs
private val logger: Logger = LoggerFactory.getLogger("libeufin-bank-db")
/**
* This error occurs in case the timestamp took by the bank for some
* event could not be converted in microseconds. Note: timestamp are
* taken via the Instant.now(), then converted to nanos, and then divided
* by 1000 to obtain the micros.
*
* It could be that a legitimate timestamp overflows in the process of
* being converted to micros - as described above. In the case of a timestamp,
* the fault lies to the bank, because legitimate timestamps must (at the
* time of writing!) go through the conversion to micros.
*
* On the other hand (and for the sake of completeness), in the case of a
* timestamp that was calculated after a client-submitted duration, the overflow
* lies to the client, because they must have specified a gigantic amount of time
* that overflew the conversion to micros and should simply have specified "forever".
*/
internal fun faultyTimestampByBank() = internalServerError("Bank took overflowing timestamp")
internal fun faultyDurationByClient() = badRequest("Overflowing duration, please specify 'forever' instead.")
class Database(dbConfig: String, internal val bankCurrency: String, internal val fiatCurrency: String?): DbPool(dbConfig, "libeufin_bank") {
internal val notifWatcher: NotificationWatcher = NotificationWatcher(pgSource)
val cashout = CashoutDAO(this)
val withdrawal = WithdrawalDAO(this)
val exchange = ExchangeDAO(this)
val conversion = ConversionDAO(this)
val account = AccountDAO(this)
val transaction = TransactionDAO(this)
val token = TokenDAO(this)
val tan = TanDAO(this)
suspend fun monitor(
params: MonitorParams
): MonitorResponse = conn { conn ->
val stmt = conn.prepareStatement("""
SELECT
cashin_count
,(cashin_regional_volume).val as cashin_regional_volume_val
,(cashin_regional_volume).frac as cashin_regional_volume_frac
,(cashin_fiat_volume).val as cashin_fiat_volume_val
,(cashin_fiat_volume).frac as cashin_fiat_volume_frac
,cashout_count
,(cashout_regional_volume).val as cashout_regional_volume_val
,(cashout_regional_volume).frac as cashout_regional_volume_frac
,(cashout_fiat_volume).val as cashout_fiat_volume_val
,(cashout_fiat_volume).frac as cashout_fiat_volume_frac
,taler_in_count
,(taler_in_volume).val as taler_in_volume_val
,(taler_in_volume).frac as taler_in_volume_frac
,taler_out_count
,(taler_out_volume).val as taler_out_volume_val
,(taler_out_volume).frac as taler_out_volume_frac
FROM stats_get_frame(NULL, ?::stat_timeframe_enum, ?)
""")
stmt.setString(1, params.timeframe.name)
if (params.which != null) {
stmt.setInt(2, params.which)
} else {
stmt.setNull(2, Types.INTEGER)
}
stmt.oneOrNull {
fiatCurrency?.run {
MonitorWithConversion(
cashinCount = it.getLong("cashin_count"),
cashinRegionalVolume = it.getAmount("cashin_regional_volume", bankCurrency),
cashinFiatVolume = it.getAmount("cashin_fiat_volume", this),
cashoutCount = it.getLong("cashout_count"),
cashoutRegionalVolume = it.getAmount("cashout_regional_volume", bankCurrency),
cashoutFiatVolume = it.getAmount("cashout_fiat_volume", this),
talerInCount = it.getLong("taler_in_count"),
talerInVolume = it.getAmount("taler_in_volume", bankCurrency),
talerOutCount = it.getLong("taler_out_count"),
talerOutVolume = it.getAmount("taler_out_volume", bankCurrency),
)
} ?: MonitorNoConversion(
talerInCount = it.getLong("taler_in_count"),
talerInVolume = it.getAmount("taler_in_volume", bankCurrency),
talerOutCount = it.getLong("taler_out_count"),
talerOutVolume = it.getAmount("taler_out_volume", bankCurrency),
)
} ?: throw internalServerError("No result from DB procedure stats_get_frame")
}
/** Apply paging logic to a sql query */
internal suspend fun <T> page(
params: PageParams,
idName: String,
query: String,
bind: PreparedStatement.() -> Int = { 0 },
map: (ResultSet) -> T
): List<T> = conn { conn ->
val backward = params.delta < 0
val pageQuery = """
$query
$idName ${if (backward) '<' else '>'} ?
ORDER BY $idName ${if (backward) "DESC" else "ASC"}
LIMIT ?
"""
conn.prepareStatement(pageQuery).run {
val pad = bind()
setLong(pad + 1, params.start)
setInt(pad + 2, abs(params.delta))
all { map(it) }
}
}
/**
* The following function returns the list of transactions, according
* to the history parameters and perform long polling when necessary
*/
internal suspend fun <T> poolHistory(
params: HistoryParams,
bankAccountId: Long,
listen: suspend NotificationWatcher.(Long, suspend (Flow<Long>) -> List<T>) -> List<T>,
query: String,
accountColumn: String = "bank_account_id",
map: (ResultSet) -> T
): List<T> {
suspend fun load(): List<T> = page(
params.page,
"bank_transaction_id",
"$query $accountColumn=? AND",
{
setLong(1, bankAccountId)
1
},
map
)
// TODO do we want to handle polling when going backward and there is no transactions yet ?
// When going backward there is always at least one transaction or none
return if (params.page.delta >= 0 && params.polling.poll_ms > 0) {
notifWatcher.(listen)(bankAccountId) { flow ->
coroutineScope {
// Start buffering notification before loading transactions to not miss any
val polling = launch {
withTimeoutOrNull(params.polling.poll_ms) {
flow.first { it > params.page.start } // Always forward so >
}
}
// Initial loading
val init = load()
// Long polling if we found no transactions
if (init.isEmpty()) {
if (polling.join() != null) {
load()
} else {
init
}
} else {
polling.cancel()
init
}
}
}
} else {
load()
}
}
}
/** Result status of withdrawal or cashout operation abortion */
enum class AbortResult {
Success,
UnknownOperation,
AlreadyConfirmed
}
fun ResultSet.getTalerTimestamp(name: String): TalerProtocolTimestamp{
return TalerProtocolTimestamp(
getLong(name).microsToJavaInstant() ?: throw faultyTimestampByBank()
)
}
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