fixup

lib/alter_proxy.ex

@@ -0,0 +1,39 @@
+defmodule AlterProxy do
+  def start(port) do
+    # 監聽端口
+    {:ok, listen_socket} =
+      :gen_tcp.listen(port, [
+        :binary,
+        packet: :line,
+        reuseaddr: true,
+        active: false,
+        backlog: 100
+      ])
+
+    accept_loop(listen_socket)
+  end
+
+  defp accept_loop(listen_socket) do
+    {:ok, socket} = :gen_tcp.accept(listen_socket)
+
+    # 爲每個客戶端創建新進程處理
+    spawn(__MODULE__, :handle_client, [socket])
+
+    # 繼續等待下一個連接
+    accept_loop(listen_socket)
+  end
+
+  def handle_client(socket) do
+    # 接收數據
+    case :gen_tcp.recv(socket, 0) do
+      {:ok, data} ->
+        IO.puts("收到: #{data}")
+        :gen_tcp.send(socket, "Echo: #{data}")
+        # 繼續接收
+        handle_client(socket)
+
+      {:error, :closed} ->
+        IO.puts("客戶端斷開連接")
+    end
+  end
+end

lib/alter_proxy/application.ex

@@ -0,0 +1,20 @@
+defmodule AlterProxy.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  @impl true
+  def start(_type, _args) do
+    children = [
+      # Starts a worker by calling: AlterProxy.Worker.start_link(arg)
+      # {AlterProxy.Worker, arg}
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: AlterProxy.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end