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/*
* This file is part of LibEuFin.
* Copyright (C) 2024 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.common.db
import tech.libeufin.common.*
import org.postgresql.jdbc.PgConnection
import org.postgresql.util.PSQLState
import java.sql.SQLException
import com.zaxxer.hikari.HikariConfig
import com.zaxxer.hikari.HikariDataSource
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
open class DbPool(cfg: DatabaseConfig, schema: String) : java.io.Closeable {
val pgSource = pgDataSource(cfg.dbConnStr)
private val pool: HikariDataSource
init {
val config = HikariConfig()
config.dataSource = pgSource
config.schema = schema.replace("-", "_")
config.transactionIsolation = "TRANSACTION_SERIALIZABLE"
pool = HikariDataSource(config)
pool.connection.use { con ->
val meta = con.metaData
val majorVersion = meta.databaseMajorVersion
val minorVersion = meta.databaseMinorVersion
if (majorVersion < MIN_VERSION) {
throw Exception("postgres version must be at least $MIN_VERSION.0 got $majorVersion.$minorVersion")
}
checkMigrations(con, cfg, schema)
}
}
suspend fun <R> conn(lambda: suspend (PgConnection) -> R): R {
// Use a coroutine dispatcher that we can block as JDBC API is blocking
return withContext(Dispatchers.IO) {
pool.connection.use { lambda(it.unwrap(PgConnection::class.java)) }
}
}
suspend fun <R> serializable(lambda: suspend (PgConnection) -> R): R = conn { conn ->
repeat(SERIALIZATION_RETRY) {
try {
return@conn lambda(conn)
} catch (e: SQLException) {
if (e.sqlState != PSQLState.SERIALIZATION_FAILURE.state)
throw e
}
}
try {
return@conn lambda(conn)
} catch (e: SQLException) {
logger.warn("Serialization failure after $SERIALIZATION_RETRY retry")
throw e
}
}
override fun close() {
pool.close()
}
}
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