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/*
* This file is part of LibEuFin.
* Copyright (C) 2020 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.nexus
import com.cronutils.model.definition.CronDefinitionBuilder
import com.cronutils.model.time.ExecutionTime
import com.cronutils.parser.CronParser
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import io.ktor.client.HttpClient
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import kotlinx.coroutines.time.delay
import org.jetbrains.exposed.sql.transactions.transaction
import tech.libeufin.nexus.bankaccount.fetchBankAccountTransactions
import tech.libeufin.nexus.bankaccount.submitAllPaymentInitiations
import tech.libeufin.nexus.server.FetchSpecJson
import tech.libeufin.util.getNow
import java.lang.IllegalArgumentException
import java.time.Duration
import java.time.Instant
import java.time.ZonedDateTime
// tick duration in milliseconds.
private var tick: Long = 1000
fun setTick(millis: Long) {
tick = millis
}
fun getTick(): Long {
return tick
}
private data class TaskSchedule(
val taskId: Long,
val name: String,
val type: String,
val resourceType: String,
val resourceId: String,
val params: String
)
private suspend fun runTask(client: HttpClient, sched: TaskSchedule) {
logger.info("running task $sched")
try {
when (sched.resourceType) {
"bank-account" -> {
when (sched.type) {
"fetch" -> {
@Suppress("BlockingMethodInNonBlockingContext")
val fetchSpec = jacksonObjectMapper().readValue(sched.params, FetchSpecJson::class.java)
fetchBankAccountTransactions(client, fetchSpec, sched.resourceId)
}
"submit" -> {
submitAllPaymentInitiations(client, sched.resourceId)
}
else -> {
logger.error("task type ${sched.type} not understood")
}
}
}
else -> logger.error("task on resource ${sched.resourceType} not understood")
}
} catch (e: Exception) {
logger.error("Exception during task $sched", e)
}
}
object NexusCron {
val parser = run {
val cronDefinition =
CronDefinitionBuilder.defineCron()
.withSeconds().and()
.withMinutes().and()
.withHours().and()
.withDayOfMonth().optional().and()
.withMonth().optional().and()
.withDayOfWeek().optional()
.and().instance()
CronParser(cronDefinition)
}
}
fun startOperationScheduler(httpClient: HttpClient) {
GlobalScope.launch {
while (true) {
logger.trace("running schedule loop")
// First, assign next execution time stamps to all tasks that need them
transaction {
NexusScheduledTaskEntity.find {
NexusScheduledTasksTable.nextScheduledExecutionSec.isNull()
}.forEach {
val cron = try {
NexusCron.parser.parse(it.taskCronspec)
} catch (e: IllegalArgumentException) {
logger.error("invalid cronspec in schedule ${it.resourceType}/${it.resourceId}/${it.taskName}")
return@forEach
}
val zonedNow = getNow()
val et = ExecutionTime.forCron(cron)
val next = et.nextExecution(zonedNow)
logger.info("scheduling task ${it.taskName} at $next (now is $zonedNow)")
it.nextScheduledExecutionSec = next.get().toEpochSecond()
}
}
val nowSec = getNow().toEpochSecond()
// Second, find tasks that are due
val dueTasks = transaction {
NexusScheduledTaskEntity.find {
NexusScheduledTasksTable.nextScheduledExecutionSec lessEq nowSec
}.map {
TaskSchedule(it.id.value, it.taskName, it.taskType, it.resourceType, it.resourceId, it.taskParams)
}
}
// Execute those due tasks
dueTasks.forEach {
runTask(httpClient, it)
transaction {
val t = NexusScheduledTaskEntity.findById(it.taskId)
if (t != null) {
// Reset next scheduled execution
t.nextScheduledExecutionSec = null
t.prevScheduledExecutionSec = nowSec
t.iterations++
}
}
}
// Wait a bit
delay(Duration.ofMillis(tick))
}
}
}
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