From 86d35fcec83057e346e4982b5a6908f25342a392 Mon Sep 17 00:00:00 2001
From: mjkwiatkowski <mati.rewa@gmail.com>
Date: Sun, 15 Feb 2026 18:26:59 +0100
Subject: feat: opendc -> postgresql connection works

---
 .../kotlin/org/opendc/common/utils/ConfigParser.kt | 72 ++++++++++++++++++++++
 .../kotlin/org/opendc/common/utils/PostgresqlDB.kt | 56 +++++++++++++++++
 2 files changed, 128 insertions(+)
 create mode 100644 opendc-common/src/main/kotlin/org/opendc/common/utils/ConfigParser.kt
 create mode 100644 opendc-common/src/main/kotlin/org/opendc/common/utils/PostgresqlDB.kt

(limited to 'opendc-common/src/main/kotlin/org/opendc/common/utils')

diff --git a/opendc-common/src/main/kotlin/org/opendc/common/utils/ConfigParser.kt b/opendc-common/src/main/kotlin/org/opendc/common/utils/ConfigParser.kt
new file mode 100644
index 00000000..cb9623bb
--- /dev/null
+++ b/opendc-common/src/main/kotlin/org/opendc/common/utils/ConfigParser.kt
@@ -0,0 +1,72 @@
+package org.opendc.common.utils
+
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.decodeFromStream
+
+import java.io.File
+import java.io.IOException
+import java.io.InputStream
+import java.io.OutputStream
+import java.net.Socket
+import java.sql.Connection
+import java.sql.DriverManager
+import java.sql.SQLException
+
+/**
+ * @property name
+ * @property backlog the amount of connections to accept
+ * @property databasePath
+ * @property address IPv4 address
+ * @property port
+ */
+@Serializable
+public data class Config(
+    val name: String = "",
+    var backlog: Int = 0,
+    val address: String = "",
+    val port: Int = 8080,
+    val postgresql: Int = 5342,
+    val username : String = "",
+    val password : String = "",
+    val database: String = ""
+){
+
+    public companion object{
+        public var input: InputStream? = null
+        public var output: OutputStream? = null
+        public var connection : Connection? = null
+
+        public var socket: Socket? = null
+
+        public fun setConfigSocket(socket: Socket?){
+            this.socket = socket
+            try {
+                input = socket?.getInputStream()
+                output = socket?.getOutputStream()
+            } catch (e: IOException){
+                print("${e.message}")
+            }
+        }
+
+        public fun getConfigReader() : InputStream? {
+            return input
+        }
+
+        public fun getConfigWriter() : OutputStream? {
+            return output
+        }
+        }
+}
+/**
+ * Reads `config.json` into Config data class.
+ */
+public class ConfigReader {
+    private val jsonReader = Json
+    public fun read(file: File): Config = read(file.inputStream())
+    @OptIn(ExperimentalSerializationApi::class)
+    public fun read(input: InputStream): Config {
+        return jsonReader.decodeFromStream<Config>(input)
+    }
+}
diff --git a/opendc-common/src/main/kotlin/org/opendc/common/utils/PostgresqlDB.kt b/opendc-common/src/main/kotlin/org/opendc/common/utils/PostgresqlDB.kt
new file mode 100644
index 00000000..3dc7a0e4
--- /dev/null
+++ b/opendc-common/src/main/kotlin/org/opendc/common/utils/PostgresqlDB.kt
@@ -0,0 +1,56 @@
+package org.opendc.common.utils
+
+import java.sql.Connection
+import java.sql.DriverManager
+import java.sql.SQLException
+
+public class PostgresqlDB {
+    public var connection : Connection? = null
+    public var dbUrl : String = ""
+    public var user : String = ""
+    public var password : String = ""
+
+    public fun setupDatabase(address : String, port : Int, dbUser : String, dbPassword : String, db : String){
+        dbUrl = "jdbc:postgresql://$address:$port/$db"
+        user = dbUser
+        password = dbPassword
+        println(dbUrl)
+        try {
+            connection = DriverManager.getConnection(dbUrl, dbUser, dbPassword)
+        } catch (e: SQLException) {
+            print("${e.message}")
+        }
+    }
+
+    public fun create(){
+        val CREATE_TABLE = """
+            CREATE TABLE metrics (
+            id SERIAL PRIMARY KEY,
+            timestamp bigint,
+            tasksActive integer, 
+            clusterName varchar(10)); 
+        """.trimIndent()
+
+        try {
+            val conn = DriverManager.getConnection(dbUrl, user, password)
+            val st = conn.createStatement()
+            st.executeQuery(CREATE_TABLE)
+        } catch (e: SQLException){
+            println("${e.message}")
+        }
+    }
+
+    public fun clear(){
+        val DELETE_ALL_TABLES = """
+            DROP SCHEMA public CASCADE;
+            CREATE SCHEMA public;
+        """.trimIndent()
+        try {
+            val conn = DriverManager.getConnection(dbUrl, user, password)
+            val st = conn.createStatement()
+            st.executeQuery(DELETE_ALL_TABLES)
+        } catch (e: SQLException){
+            println("${e.message}")
+        }
+    }
+}
\ No newline at end of file
-- 
cgit v1.2.3