Client: CommandValidator and initialRequest were added,fixed behaviour if server is unreachable; Server: GetCommandsCommand was added

client/src/main/kotlin/Main.kt

@@ -2,51 +2,43 @@ import network.NetworkManager
 import input.HumanBeingBuilder
 import input.IOManager
 import network.Request
-
+import runner.CommandValidator
-
-// BEGIN ---- Move it to CommandValidator
-
-// Команды, которые требуют ввода HumanBeing
-private val HUMAN_BEING_COMMANDS = setOf("add", "add_if_max", "add_if_min")
-
-// Команды с аргументом (UUID) в строке команды
-private val ARG_COMMANDS = setOf("update", "remove_by_id", "execute_script")
-
-// Все команды, доступные клиенту (save — только серверная)
-private val KNOWN_COMMANDS = setOf(
-    "help", "info", "show", "add", "update",
-    "remove_by_id", "clear", "execute_script",
-    "add_if_max", "add_if_min", "history",
-    "sum_of_minutes_of_waiting", "min_by_name",
-    "print_field_descending_minutes_of_waiting",
-    "exit"
-)
-
-// END ---- Move it to CommandValidator
 
 fun main(args: Array<String>) {
     val host = if (args.isNotEmpty()) args[0] else "localhost"
     val port = if (args.size >= 2) args[1].toIntOrNull() ?: 8080 else 8080
 
-    val io = IOManager()
+    val io = IOManager()                        // Name by Boris Bosenko
     val client = NetworkManager(host, port)
+    val validator = CommandValidator()
 
-    io.print("""
+    // Shutdown hook
-        |╔══════════════════════════════════════╗
-        |║   Lab6 Client — подключение к $host:$port
-        |╚══════════════════════════════════════╝
-        |Введите 'help' для справки.
-    """.trimMargin())
-
-    // Shutdown hook — закрыть канал при выходе
     Runtime.getRuntime().addShutdownHook(Thread {
         client.close()
     })
 
-    runClientRepl(io, client)
+    io.print("""
+        |════════════════════════════════════════════
+        |Lab6 Client — подключение к $host:$port  
+        |════════════════════════════════════════════
+            """.trimMargin())
+
+    runClientRepl(io, client, validator)
+}
+
+fun runClientRepl(io: IOManager, client: NetworkManager, validator: CommandValidator) {
+
+    val initialRequest = Request(
+        commandName = "getCommandsCommand",
+        humanBeing = null
+    )
+
+    if (client.sendRequest(initialRequest) == null) {
+        io.print("[!] Сервер недоступен. Попробуйте позже.")
+    } else {
+        io.print("|Введите 'help' для справки.")
     }
 
-fun runClientRepl(io: IOManager, client: NetworkManager) {
     while (true) {
         val line = io.readLine(" ☭ ") ?: break
         if (line.isBlank()) continue
@@ -55,9 +47,10 @@ fun runClientRepl(io: IOManager, client: NetworkManager) {
         val commandName = parts[0].lowercase()
         val args = parts.drop(1)
 
-        // Move to CommandValidate
+        val (isValidCommand, message) = validator.validate(commandName, args)
-        if (commandName !in KNOWN_COMMANDS) {
+
-            io.print("Неизвестная команда: '$commandName'. Введите 'help' для справки.")
+        if (!isValidCommand) {
+            if (message != null) io.print(message)
             continue
         }
 
@@ -66,26 +59,12 @@ fun runClientRepl(io: IOManager, client: NetworkManager) {
             break
         }
 
-        // In the event of using fucking script (don't)
         if (commandName == "execute_script") {
-            if (args.isEmpty()) {
-                io.print("[Ошибка] Укажите путь к файлу. Пример: execute_script script.txt")
-                continue
-            }
             io.addScriptScanner(args[0])
             continue
         }
 
-        // MOVE TO FUCKING VALIDATE
+        val humanBeing = if (validator.isBuildsHumanBeing(commandName)) {
-        // 4. Для update — нужен UUID аргумент ДО ввода HumanBeing
-        if (commandName == "update" && args.isEmpty()) {
-            io.print("[Ошибка] Укажите id элемента. Пример: update <uuid>")
-            continue
-        }
-
-        // 5. Строим HumanBeing если нужно
-        val humanBeing = if (commandName in HUMAN_BEING_COMMANDS ||
-            commandName == "update") {
             try {
                 HumanBeingBuilder(io).build()
             } catch (e: IllegalStateException) {
@@ -94,7 +73,7 @@ fun runClientRepl(io: IOManager, client: NetworkManager) {
             }
         } else null
 
-        // 6. Формируем запрос и отправляем
+        // Формируем запрос и отправляем
         val request = Request(
             commandName = commandName,
             args = args,
@@ -103,7 +82,7 @@ fun runClientRepl(io: IOManager, client: NetworkManager) {
 
         val response = client.sendRequest(request)
 
-        // 7. Обрабатываем ответ
+        // Обрабатываем ответ
         if (response == null) {
             io.print("[!] Сервер недоступен. Попробуйте позже.")
         } else {

client/src/main/kotlin/network/NetworkManager.kt

@@ -3,47 +3,44 @@ package network
 import kotlinx.serialization.SerializationException
 import lab6.prog.network.AppJson
 import java.net.InetSocketAddress
+import java.net.PortUnreachableException
 import java.nio.ByteBuffer
 import java.nio.channels.DatagramChannel
 
 
-
-/**
- * UDP-клиент на основе DatagramChannel в неблокирующем режиме.
- *
- * При недоступности сервера уведомляет пользователя и повторяет
- * попытку каждые [retryDelayMS] мс, не более [maxRetries] раз.
- *
- * @property host адрес сервера
- * @property port порт сервера
- */
 class NetworkManager(
     private val host: String,
     private val port: Int,
     private val bufferSize: Int = 65507,
     private val timeoutMS: Long  = 3000,
     private val retryDelayMS: Long = 5000,
-    private val maxRetries: Int     = 3
+    private val maxRetries: Int = 3,
 ) {
-    private val channel: DatagramChannel = DatagramChannel.open().also {
+    private var channel: DatagramChannel = openChannel()
+
+    private fun openChannel(): DatagramChannel =
+        DatagramChannel.open().also {
             it.configureBlocking(false)
             it.connect(InetSocketAddress(host, port))
         }
 
-    /**
-     * Отправляет [Request] и возвращает [Response].
-     * При недоступности сервера возвращает null.
-     */
     fun sendRequest(request: Request): Response? {
-        val requestBytes = AppJson.encodeToString(Request.serializer(), request).toByteArray(Charsets.UTF_8)
+        val requestBytes = AppJson.encodeToString(Request.serializer(), request)
+            .toByteArray(Charsets.UTF_8)
 
         repeat(maxRetries) { attempt ->
-
+            try {
                 channel.write(ByteBuffer.wrap(requestBytes))
-
                 val response = waitForResponse()
                 if (response != null) return response
 
+            } catch (e: PortUnreachableException) {
+                reconnect()
+            } catch (e: Exception) {
+                System.err.println("[Client] Ошибка отправки: ${e.message}")
+                reconnect()
+            }
+
             println(
                 "[Client] Сервер не отвечает " +
                         "(попытка ${attempt + 1}/$maxRetries). " +
@@ -56,29 +53,36 @@ class NetworkManager(
         return null
     }
 
-    /**
-     * Опрашивает канал до [timeoutMS] мс, возвращает ответ или null.
-     */
-    // catch java.net.PortUnreachableException if server is no more reachable
     private fun waitForResponse(): Response? {
         val buf = ByteBuffer.allocate(bufferSize)
         val deadline = System.currentTimeMillis() + timeoutMS
 
         while (System.currentTimeMillis() < deadline) {
+            try {
                 buf.clear()
                 if (channel.read(buf) > 0) {
                     buf.flip()
-                return try {
+                    return AppJson.decodeFromString<Response>(
-                    AppJson.decodeFromString<Response>(Charsets.UTF_8.decode(buf).toString())
+                        Charsets.UTF_8.decode(buf).toString()
+                    )
+                }
+            } catch (e: PortUnreachableException) {
+                return null
             } catch (e: SerializationException) {
                 System.err.println("[Client] Некорректный ответ сервера: ${e.message}")
-                    null
+                return null
-                }
             }
             Thread.sleep(50)
         }
         return null
     }
 
-    fun close() = channel.close()
+    private fun reconnect() {
+        try { channel.close() } catch (_: Exception) {}
+        channel = openChannel()
+    }
+
+    fun close() {
+        try { channel.close() } catch (_: Exception) {}
+    }
 }

client/src/main/kotlin/runner/CommandValidator.kt

@@ -1,4 +1,40 @@
 package runner
 
 class CommandValidator {
+
+    // Команды, которые требуют ввода HumanBeing
+    private val humanBeingCommands = setOf("add", "add_if_max", "add_if_min")
+
+    // Команды с аргументом
+    private val commandsWArgs = setOf("update", "remove_by_id", "execute_script")
+
+    // Все команды, доступные клиенту
+    private val knownCommands = setOf(
+        "help", "info", "show", "add", "update",
+        "remove_by_id", "clear", "execute_script",
+        "add_if_max", "add_if_min", "history",
+        "sum_of_minutes_of_waiting", "min_by_name",
+        "print_field_descending_minutes_of_waiting",
+        "exit"
+    )
+
+    fun validate(command: String, args: List<String>?): Pair<Boolean, String?> {
+        if (command !in knownCommands){
+            return Pair(false, "Неизвестная команда: '$command'. Введите 'help' для справки.")
+        }
+
+        if (command in commandsWArgs && args?.isEmpty() == true) {
+            return if (command == "execute_script") {
+                Pair(false, "[Ошибка] Укажите путь к файлу. Пример: execute_script script.txt")
+            } else {
+                // maybe create another set w commands w file args and another for other args
+                Pair(false, "[Ошибка] Укажите id элемента. Пример: $command <uuid>")
+            }
+        }
+         return Pair(true, null)
+    }
+
+    fun isBuildsHumanBeing(command: String): Boolean {
+        return command in humanBeingCommands
+    }
 }

data.csv

@@ -0,0 +1 @@
+id,name,coordX,coordY,creationDate,realHero,hasToothpick,impactSpeed,soundtrackName,minutesOfWaiting,weaponType,carCool

server/src/main/kotlin/Main.kt

@@ -67,6 +67,7 @@ fun registerServerCommands(
         AddIfMaxCommand(manager),
         AddIfMinCommand(manager),
         HistoryCommand(invoker),
+        GetCommandsCommand(invoker),
         SumOfMinutesCommand(manager),
         MinByNameCommand(manager),
         PrintDescendingMinutesCommand(manager),

server/src/main/kotlin/commands/GetCommandsCommand.kt

@@ -0,0 +1,15 @@
+package commands
+
+import models.HumanBeing
+import runner.CommandInvoker
+
+class GetCommandsCommand (
+    private val invoker: CommandInvoker
+): Command {
+    override val name: String = "GetCommands"
+    override val description: String = "Получает все доступные с сервера команды"
+
+    override fun execute(args: List<String>, humanBeing: HumanBeing?): String {
+        return invoker.getCommands().toString()
+    }
+}