[libeufin] branch master updated: sandbox DB refactoring: some prepared statements.

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ms pushed a commit to branch master
in repository libeufin.

The following commit(s) were added to refs/heads/master by this push:
     new c59bab11 sandbox DB refactoring: some prepared statements.
c59bab11 is described below

commit c59bab113ee18920f0447e22c42e3c500722aa1f
Author: MS <ms@taler.net>
AuthorDate: Tue Aug 29 11:39:30 2023 +0200

    sandbox DB refactoring: some prepared statements.
---
 .../main/kotlin/tech/libeufin/sandbox/Database.kt  | 218 +++++++++++++++++++++
 1 file changed, 218 insertions(+)

diff --git a/sandbox/src/main/kotlin/tech/libeufin/sandbox/Database.kt 
b/sandbox/src/main/kotlin/tech/libeufin/sandbox/Database.kt
new file mode 100644
index 00000000..5a978180
--- /dev/null
+++ b/sandbox/src/main/kotlin/tech/libeufin/sandbox/Database.kt
@@ -0,0 +1,218 @@
+package tech.libeufin.sandbox
+
+import org.postgresql.jdbc.PgConnection
+import tech.libeufin.util.internalServerError
+
+import java.sql.DriverManager
+import java.sql.PreparedStatement
+import java.sql.ResultSet
+
+private const val DB_CTR_LIMIT = 1000000
+
+data class Customer(
+    val login: String,
+    val passwordHash: String,
+    val name: String,
+    val email: String,
+    val phone: String,
+    val cashoutPayto: String,
+    val cashoutCurrency: String
+)
+
+data class TalerAmount(
+    val value: Int, // maps to INT4
+    val frac: Long // maps to INT8
+)
+
+data class BankAccount(
+    val iban: String,
+    val bic: String,
+    val bankAccountLabel: String,
+    val owningCustomerId: Long,
+    val isPublic: Boolean = false,
+    val lastNexusFetchRowId: Long,
+    val balance: TalerAmount
+)
+
+enum class TransactionDirection {
+    Credit, Debit
+}
+
+data class BankAccountTransaction(
+    val creditorIban: String,
+    val creditorBic: String,
+    val creditorName: String,
+    val debtorIban: String,
+    val debtorBic: String,
+    val debtorName: String,
+    val subject: String,
+    val amount: TalerAmount,
+    val transactionDate: Long, // microseconds
+    val accountServicerReference: String,
+    val paymentInformationId: String,
+    val endToEndId: String,
+    val isPending: Boolean,
+    val direction: TransactionDirection,
+    val bankAccountId: Long,
+)
+
+class Database(private val dbConfig: String) {
+    private var dbConn: PgConnection? = null
+    private var dbCtr: Int = 0
+    private val preparedStatements: MutableMap<String, PreparedStatement> = 
mutableMapOf()
+
+    init {
+        Class.forName("org.postgresql.Driver")
+    }
+    private fun reconnect() {
+        dbCtr++
+        val myDbConn = dbConn
+        if ((dbCtr < DB_CTR_LIMIT && myDbConn != null) && !(myDbConn.isClosed))
+            return
+        dbConn?.close()
+        preparedStatements.clear()
+        dbConn = 
DriverManager.getConnection(dbConfig).unwrap(PgConnection::class.java)
+        dbCtr = 0
+    }
+
+    private fun prepare(sql: String): PreparedStatement {
+        var ps = preparedStatements[sql]
+        if (ps != null) return ps
+        val myDbConn = dbConn
+        if (myDbConn == null) throw internalServerError("DB connection down")
+        ps = myDbConn.prepareStatement(sql)
+        preparedStatements[sql] = ps
+        return ps
+    }
+
+    // CONFIG
+    fun configGet(configKey: String): String? {
+        reconnect()
+        val stmt = prepare("""
+            SELECT value FROM configuration WHERE key=?;
+        """.trimIndent())
+        stmt.setString(1, configKey)
+        if (!stmt.execute()) return null
+        stmt.use {
+            return stmt.resultSet.getString("value")
+        }
+    }
+    fun configSet(configKey: String, configValue: String) {
+        reconnect()
+        val stmt = prepare("""
+            UPDATE configuration SET value=? WHERE key=? 
+        """.trimIndent())
+        stmt.setString(1, configValue)
+        stmt.setString(2, configKey)
+        stmt.execute()
+    }
+
+    // CUSTOMERS
+    fun customerCreate(customer: Customer) {
+        reconnect()
+        val stmt = prepare("""
+            INSERT INTO customers VALUES (?, ?, ?, ?, ?, ?, ?) 
+        """.trimIndent()
+        )
+        stmt.setString(1, customer.login)
+        stmt.setString(2, customer.passwordHash)
+        stmt.setString(3, customer.name)
+        stmt.setString(4, customer.email)
+        stmt.setString(5, customer.phone)
+        stmt.setString(6, customer.cashoutPayto)
+        stmt.setString(7, customer.cashoutCurrency)
+        stmt.execute()
+    }
+    fun customerGetFromLogin(login: String, cb: (ResultSet)->Unit) {
+        reconnect()
+        val stmt = prepare("""
+            SELECT * FROM customers WHERE login=?
+        """.trimIndent())
+        stmt.setString(1, login)
+        if (!stmt.execute()) return
+        stmt.use { // why .use{} and not directly access .resultSet?
+            cb(stmt.resultSet)
+        }
+    }
+    // Possibly more "customerGetFrom*()" to come.
+
+    // BANK ACCOUNTS
+    fun bankAccountCreate(bankAccount: BankAccount) {
+        reconnect()
+        val stmt = prepare("""
+            INSERT INTO bank_accounts VALUES (?, ?, ?, ?, ?, ?, ?)
+        """.trimIndent())
+        stmt.setString(1, bankAccount.iban)
+        stmt.setString(1, bankAccount.bic)
+        stmt.setString(1, bankAccount.bankAccountLabel)
+        stmt.setLong(1, bankAccount.owningCustomerId)
+        stmt.setLong(1, bankAccount.lastNexusFetchRowId)
+        // Following might fail and need a "?::taler_amount" on the last 
parameter.
+        // See: 
https://stackoverflow.com/questions/10571821/inserting-into-custom-sql-types-with-prepared-statements-in-java
+        stmt.setObject(1, bankAccount.balance)
+        stmt.execute()
+    }
+    fun bankAccountGetFromLabel(bankAccountLabel: String, cb: (ResultSet) -> 
Unit) {
+        reconnect()
+        val stmt = prepare("""
+            SELECT * FROM bank_accounts WHERE bank_account_label=?
+        """.trimIndent())
+        stmt.setString(1, bankAccountLabel)
+        if (!stmt.execute()) return
+        stmt.use { // why .use{} and not directly access .resultSet?
+            cb(stmt.resultSet)
+        }
+    }
+    // More bankAccountGetFrom*() to come, on a needed basis.
+
+    // BANK ACCOUNT TRANSACTIONS
+    fun bankTransactionCreate(tx: BankAccountTransaction) {
+        reconnect()
+        val stmt = prepare("""
+            INSERT INTO bank_account_transactions VALUES 
(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
+        """.trimIndent())
+        stmt.setString(1, tx.creditorIban)
+        stmt.setString(2, tx.creditorBic)
+        stmt.setString(3, tx.creditorName)
+        stmt.setString(4, tx.debtorIban)
+        stmt.setString(5, tx.debtorBic)
+        stmt.setString(6, tx.debtorName)
+        stmt.setString(7, tx.subject)
+        stmt.setObject(8, tx.amount)
+        stmt.setLong(9, tx.transactionDate)
+        stmt.setString(10, tx.accountServicerReference)
+        stmt.setString(11, tx.paymentInformationId)
+        stmt.setString(12, tx.endToEndId)
+        stmt.setBoolean(13, tx.isPending)
+        stmt.setObject(14, tx.direction)
+        stmt.setLong(15, tx.bankAccountId)
+        stmt.execute()
+    }
+
+    fun bankTransactionGetForHistoryPage(
+        upperBound: Long,
+        bankAccountId: Long,
+        fromMs: Long,
+        toMs: Long,
+        cb: (ResultSet) -> Unit
+    ) {
+        reconnect()
+        val stmt = prepare("""
+            SELECT * FROM bank_account_transactions WHERE
+            bankAccountTransactionId < ?
+            AND bank_account_id=?
+            AND transaction_date BETWEEN ? AND ?
+        """.trimIndent())
+        stmt.setLong(1, upperBound)
+        stmt.setLong(2, bankAccountId)
+        stmt.setLong(3, fromMs)
+        stmt.setLong(4, toMs)
+        if (!stmt.execute()) return
+        stmt.use {
+            cb(stmt.resultSet)
+        }
+    }
+    // NOTE: to run BFH, EBICS and cash-out tables can be postponed.
+
+
+}

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