refactor(update-center): 消除刷新重试代码重复并加对称设计注释

- updateCenter.ts: 提取 getBackoffDelay，补充与主进程预刷新为对称设计的说明
- index.ts: 提取 getPreRefreshBackoffDelay，对齐命名与注释
- 仅消除重复拼写、补注释，刷新重试功能行为不变
- 超时保护仍只作用于刷新源路径，不波及列表加载与其他 IPC

验证: eslint + vue-tsc 通过，test-build 5.2.1.14-test 通过

electron/main/backend/update-center/index.ts

@@ -512,6 +512,131 @@ export const loadUpdateCenterItems = async (
   };
 };
 
+// 子进程超时（毫秒）：网络慢/镜像源卡死时，避免命令永久挂起
+const SYSTEM_UPDATE_COMMAND_TIMEOUT_MS = 90_000;
+
+// 带超时保护的命令执行：超时杀掉子进程并 resolve，防止调用方永久冻结
+const runCommandWithTimeout = (
+  command: string,
+  args: string[],
+): Promise<{ code: number; stdout: string; stderr: string }> =>
+  new Promise((resolve) => {
+    const child = spawn(command, args, { shell: false, env: process.env });
+    let stdout = "";
+    let stderr = "";
+    let settled = false;
+    const timer = setTimeout(() => {
+      if (settled) return;
+      settled = true;
+      try {
+        child.kill("SIGKILL");
+      } catch {
+        // 忽略杀进程异常
+      }
+      resolve({
+        code: -1,
+        stdout,
+        stderr: `${stderr}\n[timeout] command exceeded ${SYSTEM_UPDATE_COMMAND_TIMEOUT_MS}ms`,
+      });
+    }, SYSTEM_UPDATE_COMMAND_TIMEOUT_MS);
+    const finish = (result: {
+      code: number;
+      stdout: string;
+      stderr: string;
+    }): void => {
+      if (settled) return;
+      settled = true;
+      clearTimeout(timer);
+      resolve(result);
+    };
+    child.stdout?.on("data", (data) => {
+      stdout += data.toString();
+    });
+    child.stderr?.on("data", (data) => {
+      stderr += data.toString();
+    });
+    child.on("error", (err) =>
+      finish({ code: -1, stdout, stderr: err.message }),
+    );
+    child.on("close", (code) => finish({ code: code ?? -1, stdout, stderr }));
+  });
+
+// 刷新软件源（aptss ssupdate + apm update），提权执行。
+// 供更新中心 IPC 与“启动后空闲预刷新”复用，单一逻辑来源。
+export const runSystemUpdateSources = async (
+  storeFilter: StoreFilter = "both",
+): Promise<{ aptss?: string; apm?: string }> => {
+  console.log(
+    `[UpdateCenter] runSystemUpdateSources called with storeFilter=${storeFilter}`,
+  );
+
+  const results: { aptss?: string; apm?: string } = {};
+  const isSourceEnabled = (
+    filter: StoreFilter,
+    source: "spark" | "apm",
+  ): boolean => filter === "both" || filter === source;
+
+  if (isSourceEnabled(storeFilter, "spark")) {
+    const whichResult = await runCommandWithTimeout("which", ["aptss"]);
+    const aptssAvailable =
+      whichResult.code === 0 && whichResult.stdout.trim().length > 0;
+    if (aptssAvailable) {
+      console.log("[UpdateCenter] Running: pkexec shell-caller aptss ssupdate");
+      const superUserCmd = await findExecutable(
+        SUPER_USER_COMMAND_CANDIDATES[0],
+      );
+      if (superUserCmd) {
+        const result = await runCommandWithTimeout(superUserCmd, [
+          SHELL_CALLER_PATH,
+          "aptss",
+          "ssupdate",
+        ]);
+        results.aptss =
+          result.code === 0
+            ? "ok"
+            : `failed: ${result.stderr.substring(0, 200)}`;
+        console.log("[UpdateCenter] aptss ssupdate result:", results.aptss);
+      } else {
+        results.aptss = "failed: pkexec not found";
+        console.warn("[UpdateCenter] pkexec not found, skipping aptss update");
+      }
+    } else {
+      results.aptss = "skipped: aptss not installed";
+    }
+  }
+
+  if (isSourceEnabled(storeFilter, "apm")) {
+    const whichResult = await runCommandWithTimeout("which", ["apm"]);
+    const apmAvailable =
+      whichResult.code === 0 && whichResult.stdout.trim().length > 0;
+    if (apmAvailable) {
+      console.log("[UpdateCenter] Running: pkexec shell-caller apm update");
+      const superUserCmd = await findExecutable(
+        SUPER_USER_COMMAND_CANDIDATES[0],
+      );
+      if (superUserCmd) {
+        const result = await runCommandWithTimeout(superUserCmd, [
+          SHELL_CALLER_PATH,
+          "apm",
+          "update",
+        ]);
+        results.apm =
+          result.code === 0
+            ? "ok"
+            : `failed: ${result.stderr.substring(0, 200)}`;
+        console.log("[UpdateCenter] apm update result:", results.apm);
+      } else {
+        results.apm = "failed: pkexec not found";
+        console.warn("[UpdateCenter] pkexec not found, skipping apm update");
+      }
+    } else {
+      results.apm = "skipped: apm not installed";
+    }
+  }
+
+  return results;
+};
+
 export const registerUpdateCenterIpc = (
   ipc: Pick<typeof ipcMain, "handle">,
   service: Pick<
@@ -528,111 +653,8 @@ export const registerUpdateCenterIpc = (
 ): void => {
   ipc.handle(
     "update-center-run-system-update",
-    async (_event, storeFilter: StoreFilter = "both") => {
+    async (_event, storeFilter: StoreFilter = "both") =>
-      console.log(
+      runSystemUpdateSources(storeFilter),
-        `[UpdateCenter] update-center-run-system-update called with storeFilter=${storeFilter}`,
-      );
-
-      const results: { aptss?: string; apm?: string } = {};
-
-      const runCommand = (
-        command: string,
-        args: string[],
-      ): Promise<{ code: number; stdout: string; stderr: string }> =>
-        new Promise((resolve) => {
-          const child = spawn(command, args, {
-            shell: false,
-            env: process.env,
-          });
-          let stdout = "";
-          let stderr = "";
-          child.stdout?.on("data", (data) => {
-            stdout += data.toString();
-          });
-          child.stderr?.on("data", (data) => {
-            stderr += data.toString();
-          });
-          child.on("error", (err) =>
-            resolve({ code: -1, stdout, stderr: err.message }),
-          );
-          child.on("close", (code) =>
-            resolve({ code: code ?? -1, stdout, stderr }),
-          );
-        });
-
-      const isSourceEnabled = (
-        filter: StoreFilter,
-        source: "spark" | "apm",
-      ): boolean => filter === "both" || filter === source;
-
-      // aptss update — 需要提权
-      if (isSourceEnabled(storeFilter, "spark")) {
-        const whichResult = await runCommand("which", ["aptss"]);
-        const aptssAvailable =
-          whichResult.code === 0 && whichResult.stdout.trim().length > 0;
-        if (aptssAvailable) {
-          console.log(
-            "[UpdateCenter] Running: pkexec shell-caller aptss ssupdate",
-          );
-          const superUserCmd = await findExecutable(
-            SUPER_USER_COMMAND_CANDIDATES[0],
-          );
-          if (superUserCmd) {
-            const result = await runCommand(superUserCmd, [
-              SHELL_CALLER_PATH,
-              "aptss",
-              "ssupdate",
-            ]);
-            results.aptss =
-              result.code === 0
-                ? "ok"
-                : `failed: ${result.stderr.substring(0, 200)}`;
-            console.log("[UpdateCenter] aptss ssupdate result:", results.aptss);
-          } else {
-            results.aptss = "failed: pkexec not found";
-            console.warn(
-              "[UpdateCenter] pkexec not found, skipping aptss update",
-            );
-          }
-        } else {
-          results.aptss = "skipped: aptss not installed";
-        }
-      }
-
-      // apm update — 也需要提权
-      if (isSourceEnabled(storeFilter, "apm")) {
-        const whichResult = await runCommand("which", ["apm"]);
-        const apmAvailable =
-          whichResult.code === 0 && whichResult.stdout.trim().length > 0;
-        if (apmAvailable) {
-          console.log("[UpdateCenter] Running: pkexec shell-caller apm update");
-          const superUserCmd = await findExecutable(
-            SUPER_USER_COMMAND_CANDIDATES[0],
-          );
-          if (superUserCmd) {
-            const result = await runCommand(superUserCmd, [
-              SHELL_CALLER_PATH,
-              "apm",
-              "update",
-            ]);
-            results.apm =
-              result.code === 0
-                ? "ok"
-                : `failed: ${result.stderr.substring(0, 200)}`;
-            console.log("[UpdateCenter] apm update result:", results.apm);
-          } else {
-            results.apm = "failed: pkexec not found";
-            console.warn(
-              "[UpdateCenter] pkexec not found, skipping apm update",
-            );
-          }
-        } else {
-          results.apm = "skipped: apm not installed";
-        }
-      }
-
-      return results;
-    },
   );
 
   ipc.handle(

electron/main/index.ts

@@ -19,7 +19,10 @@ import { handleCommandLine } from "./deeplink.js";
 import { isLoaded } from "../global.js";
 import { tasks } from "./backend/install-manager.js";
 import { sendTelemetryOnce } from "./backend/telemetry.js";
-import { initializeUpdateCenter } from "./backend/update-center/index.js";
+import {
+  initializeUpdateCenter,
+  runSystemUpdateSources,
+} from "./backend/update-center/index.js";
 import {
   getMainWindowCloseAction,
   type MainWindowCloseGuardState,
@@ -656,7 +659,51 @@ app.whenReady().then(() => {
   initializeUpdateCenter();
   // 启动后执行一次遥测（仅 Linux，不阻塞）
   sendTelemetryOnce(getAppVersion());
+
+  // 注册“渲染进程首页加载完成”信号：收到后立即开始后台刷新软件源，
+  // 趁系统负载不高时提前刷新 aptss/apm 源，用户稍后打开“软件更新”即可秒出。
+  // 同时保留一个兜底定时器，防止渲染进程未发信号时完全不刷新。
+  ipcMain.on("update-center-trigger-prefetch", () => {
+    startSourcePreRefreshOnce();
   });
+  setTimeout(startSourcePreRefreshOnce, PRE_REFRESH_FALLBACK_MS);
+});
+
+// 启动后空闲预刷新软件源（带重试），不阻塞启动流程
+// 与 src/modules/updateCenter.ts 的 backgroundRefresh 重试为【对称设计】，非代码遗漏：
+// 主进程负责“启动预热”，前端负责“打开兜底”，
+// 两者进程/守卫/调用目标不同，故各自保留一份，勿抽共享。
+const PRE_REFRESH_BACKOFF_MS = [2000, 4000, 8000];
+const PRE_REFRESH_MAX_RETRIES = 3;
+const PRE_REFRESH_FALLBACK_MS = 15_000; // 渲染信号未到达时的兜底，15s 后也跑
+let preRefreshStarted = false;
+
+// 按重试次数取退避毫秒（越界时回退到最大间隔）
+const getPreRefreshBackoffDelay = (attempt: number): number =>
+  PRE_REFRESH_BACKOFF_MS[attempt - 1] ??
+  PRE_REFRESH_BACKOFF_MS[PRE_REFRESH_BACKOFF_MS.length - 1];
+
+// 确保预刷新只触发一次（渲染信号或兜底定时器 whichever first）
+const startSourcePreRefreshOnce = (attempt = 1): void => {
+  if (preRefreshStarted) return;
+  preRefreshStarted = true;
+
+  const run = (): void => {
+    runSystemUpdateSources("both")
+      .then((results) => {
+        console.log("[UpdateCenter] pre-refresh done:", results);
+      })
+      .catch((error) => {
+        console.warn("[UpdateCenter] pre-refresh failed:", error);
+        if (attempt < PRE_REFRESH_MAX_RETRIES) {
+          const delay = getPreRefreshBackoffDelay(attempt);
+          setTimeout(() => startSourcePreRefreshOnce(attempt + 1), delay);
+        }
+      });
+  };
+
+  run();
+};
 
 app.on("window-all-closed", () => {
   win = null;

src/App.vue

@@ -3466,6 +3466,9 @@ onMounted(async () => {
   window.ipcRenderer.on("remove-complete", handleRemoveComplete);
 
   window.ipcRenderer.send("renderer-ready", { status: true });
+  // 首页/数据加载完成（主界面已可交互），通知主进程立即开始后台刷新软件源，
+  // 趁系统负载不高时提前刷新 aptss/apm 源，用户稍后打开“软件更新”即可秒出。
+  window.ipcRenderer.send("update-center-trigger-prefetch");
   logger.info("Renderer process is ready!");
 });
 

src/modules/updateCenter.ts

@@ -133,11 +133,8 @@ export const createUpdateCenterStore = (): UpdateCenterStore => {
     isBound = false;
   };
 
-  // 先刷新软件源，再加载更新列表；刷新失败仅告警，不阻断扫描
+  // 刷新软件源（不加载列表）：网络慢/卡死由主进程超时保护，不会永久挂起
-  const runSystemUpdateThenLoad = async (
+  const runSystemUpdate = async (storeFilter: StoreFilter): Promise<void> => {
-    storeFilter: StoreFilter,
-    load: (filter: StoreFilter) => Promise<UpdateCenterSnapshot>,
-  ): Promise<void> => {
     try {
       await window.ipcRenderer.invoke(
         "update-center-run-system-update",
@@ -145,9 +142,61 @@ export const createUpdateCenterStore = (): UpdateCenterStore => {
       );
     } catch (error) {
       console.error("[UpdateCenter] system update failed", error);
+      throw error;
     }
-    const nextSnapshot = await load(storeFilter);
+  };
+
+  // 主动刷新：先刷新源再加载列表（用户点击刷新按钮时使用，期望即时结果）
+  const refresh = async (
+    storeFilter: StoreFilter = lastStoreFilter,
+  ): Promise<void> => {
+    lastStoreFilter = storeFilter;
+    loading.value = true;
+    try {
+      await runSystemUpdate(storeFilter);
+      const nextSnapshot = await window.updateCenter.refresh(storeFilter);
       applySnapshot(nextSnapshot);
+    } finally {
+      loading.value = false;
+    }
+  };
+
+  // 打开更新中心：先用缓存秒开列表（不卡 UI），再后台刷新源并重新加载。
+  // 后台刷新带指数退避重试；窗口关闭即停，避免无效重试。
+  // 与 electron/main/index.ts 的预刷新重试为【对称设计】，非代码遗漏：
+  // 前端负责“打开更新中心兜底”，主进程负责“启动预热”，
+  // 两者进程/守卫/调用目标不同，故各自保留一份，勿抽共享。
+  const MAX_BACKGROUND_RETRIES = 3;
+  const BACKGROUND_BACKOFF_MS = [2000, 4000, 8000];
+
+  // 按重试次数取退避毫秒（越界时回退到最大间隔）
+  const getBackoffDelay = (attempt: number): number =>
+    BACKGROUND_BACKOFF_MS[attempt - 1] ??
+    BACKGROUND_BACKOFF_MS[BACKGROUND_BACKOFF_MS.length - 1];
+
+  const backgroundRefresh = async (
+    storeFilter: StoreFilter,
+    attempt: number,
+  ): Promise<void> => {
+    if (!isOpen.value) return; // 窗口已关闭，停止重试
+    try {
+      await runSystemUpdate(storeFilter);
+      const nextSnapshot = await window.updateCenter.refresh(storeFilter);
+      if (!isOpen.value) return;
+      applySnapshot(nextSnapshot);
+    } catch (error) {
+      if (attempt >= MAX_BACKGROUND_RETRIES) {
+        console.warn(
+          `[UpdateCenter] background refresh failed after ${MAX_BACKGROUND_RETRIES} attempts`,
+          error,
+        );
+        return;
+      }
+      const delay = getBackoffDelay(attempt);
+      window.setTimeout(() => {
+        void backgroundRefresh(storeFilter, attempt + 1);
+      }, delay);
+    }
   };
 
   const open = async (storeFilter: StoreFilter = "both"): Promise<void> => {
@@ -156,22 +205,14 @@ export const createUpdateCenterStore = (): UpdateCenterStore => {
     isOpen.value = true;
     loading.value = true;
     try {
-      await runSystemUpdateThenLoad(storeFilter, window.updateCenter.open);
+      // 1. 先加载缓存，立即显示列表（秒开，不阻塞于网络刷新）
-    } finally {
+      const cachedSnapshot = await window.updateCenter.open(storeFilter);
-      loading.value = false;
+      applySnapshot(cachedSnapshot);
-    }
-  };
-
-  const refresh = async (
-    storeFilter: StoreFilter = lastStoreFilter,
-  ): Promise<void> => {
-    lastStoreFilter = storeFilter;
-    loading.value = true;
-    try {
-      await runSystemUpdateThenLoad(storeFilter, window.updateCenter.refresh);
     } finally {
       loading.value = false;
     }
+    // 2. 后台异步刷新源并在完成后更新列表（失败自动重试）
+    void backgroundRefresh(storeFilter, 1);
   };
 
   const ignoreItem = async (