feat: 后端改为deno

backend-deno/modules/background_tasks.ts

@@ -0,0 +1,94 @@
+/**
+ * 后台任务管理模块 (Deno 版本)
+ * 负责定期获取音乐状态和歌词更新
+ */
+
+import { ConnectionManager } from "./websocket_manager.ts";
+import { getMusicStatus, MusicStatus } from "./apple_music.ts";
+import { getLyricsData, LyricsData } from "./lyrics.ts";
+
+let backgroundTaskId: number | null = null;
+
+/**
+ * 启动后台任务
+ */
+export function startBackgroundTask(manager: ConnectionManager): void {
+  if (backgroundTaskId) {
+    console.log("后台任务已在运行");
+    return;
+  }
+
+  console.log("启动后台任务...");
+
+  backgroundTaskId = setInterval(async () => {
+    await updateMusicInfo(manager);
+  }, 1000); // 每秒更新一次
+
+  console.log("后台任务已启动");
+}
+
+/**
+ * 停止后台任务
+ */
+export function stopBackgroundTask(): void {
+  if (backgroundTaskId) {
+    clearInterval(backgroundTaskId);
+    backgroundTaskId = null;
+    console.log("后台任务已停止");
+  }
+}
+
+/**
+ * 更新音乐信息并发送给客户端
+ */
+export async function updateMusicInfo(
+  manager: ConnectionManager
+): Promise<void> {
+  try {
+    // 获取音乐状态
+    const musicStatus = await getMusicStatus();
+
+    if (musicStatus.status === "error") {
+      console.warn(`获取音乐状态失败: ${musicStatus.error}`);
+      return;
+    }
+
+    // 获取歌词数据
+    const lyricsData = await getLyricsData(musicStatus);
+
+    // 合并数据
+    const updateData = {
+      type: "music_update",
+      timestamp: Date.now(),
+      music: musicStatus,
+      lyrics: lyricsData,
+    };
+
+    // 发送给所有连接的客户端
+    manager.broadcast(updateData);
+  } catch (error) {
+    console.error(`更新音乐信息时出错: ${error}`);
+  }
+}
+
+/**
+ * 获取歌词并发送更新
+ */
+export async function fetchAndUpdateLyrics(
+  status: MusicStatus,
+  manager: ConnectionManager
+): Promise<void> {
+  try {
+    const lyricsData = await getLyricsData(status);
+
+    const updateData = {
+      type: "lyrics_update",
+      timestamp: Date.now(),
+      lyrics: lyricsData,
+    };
+
+    manager.broadcast(updateData);
+  } catch (error) {
+    console.error(`获取歌词并发送更新时出错: ${error}`);
+  }
+}