Add server failover rotation for classworkscloud provider

src/components/settings/cards/DataProviderSettingsCard.vue

@@ -90,6 +90,7 @@
 import SettingsCard from "@/components/SettingsCard.vue";
 import {getSetting} from "@/utils/settings";
 import axios from "axios";
+import {tryWithRotation, isRotationEnabled} from "@/utils/serverRotation";
 
 export default {
   name: "DataProviderSettingsCard",
@@ -132,31 +133,82 @@ export default {
     async checkServerConnection() {
       this.loading = true;
       this.serverchecktime = new Date();
+      const triedServers = [];
+
       try {
-        const domain = getSetting("server.domain");
         const siteKey = getSetting("server.siteKey");
-
+        
         // Prepare headers including site key if available
         const headers = {Accept: "application/json"};
         if (siteKey) {
           headers["x-site-key"] = siteKey;
         }
 
-        const response = await axios.get(`${domain}/check`, {
-          method: "GET",
-          headers,
-        });
-
-        if (response.data.status === "success") {
-          this.$message.success(
-            "连接成功",
-            "服务器连接正常 延迟" + (new Date() - this.serverchecktime) + "ms"
+        // Use rotation for classworkscloud provider
+        if (isRotationEnabled()) {
+          const response = await tryWithRotation(
+            async (serverUrl) => {
+              const res = await axios.get(`${serverUrl}/check`, {
+                method: "GET",
+                headers,
+              });
+              if (res.data.status !== "success") {
+                throw new Error("服务器响应异常");
+              }
+              return res;
+            },
+            {
+              onServerTried: ({url, status, tried}) => {
+                triedServers.length = 0;
+                triedServers.push(...tried);
+              }
+            }
           );
+
+          // Build success message with tried servers info
+          const latency = new Date() - this.serverchecktime;
+          const successServer = triedServers.find(s => s.status === "success");
+          let message = `服务器连接正常 延迟${latency}ms`;
+
+          if (triedServers.length > 1) {
+            const serverList = triedServers.map((s, i) => 
+              `${i + 1}. ${s.url} (${s.status === "success" ? "成功" : "失败"})`
+            ).join("\n");
+            message += `\n\n依次尝试的服务器:\n${serverList}`;
+          } else if (successServer) {
+            message += `\n服务器: ${successServer.url}`;
+          }
+
+          this.$message.success("连接成功", message);
         } else {
-          throw new Error("服务器响应异常");
+          // Standard single-server check for other providers
+          const domain = getSetting("server.domain");
+          const response = await axios.get(`${domain}/check`, {
+            method: "GET",
+            headers,
+          });
+
+          if (response.data.status === "success") {
+            this.$message.success(
+              "连接成功",
+              "服务器连接正常 延迟" + (new Date() - this.serverchecktime) + "ms"
+            );
+          } else {
+            throw new Error("服务器响应异常");
+          }
         }
       } catch (error) {
-        this.$message.error("连接失败", error.message || "无法连接到服务器");
+        // Build error message with tried servers info
+        let errorMessage = error.message || "无法连接到服务器";
+
+        if (triedServers.length > 0) {
+          const serverList = triedServers.map((s, i) => 
+            `${i + 1}. ${s.url} (失败${s.error ? `: ${s.error}` : ""})`
+          ).join("\n");
+          errorMessage += `\n\n依次尝试的服务器:\n${serverList}\n\n所有服务器均连接失败`;
+        }
+
+        this.$message.error("连接失败", errorMessage);
       } finally {
         this.loading = false;
       }

src/utils/api.js

@@ -1,5 +1,6 @@
 import axios from "@/axios/axios";
 import {getSetting} from "@/utils/settings";
+import {tryWithRotation, isRotationEnabled} from "@/utils/serverRotation";
 
 // Helper function to check if provider is valid for API calls
 const isValidProvider = () => {
@@ -33,9 +34,18 @@ export const getNamespaceInfo = async () => {
     throw new Error("当前数据提供者不支持此操作");
   }
 
-  const serverUrl = getSetting("server.domain");
-
   try {
+    // Use rotation for classworkscloud provider
+    if (isRotationEnabled()) {
+      const response = await tryWithRotation(async (serverUrl) => {
+        return await axios.get(`${serverUrl}/kv/_info`, {
+          headers: getHeaders(),
+        });
+      });
+      return response.data;
+    }
+
+    const serverUrl = getSetting("server.domain");
     const response = await axios.get(`${serverUrl}/kv/_info`, {
       headers: getHeaders(),
     });

src/utils/dataProvider.js

@@ -1,6 +1,7 @@
 import {kvLocalProvider} from "./providers/kvLocalProvider";
 import {kvServerProvider} from "./providers/kvServerProvider";
 import {getSetting, setSetting} from "./settings";
+import {getEffectiveServerUrl} from "./serverRotation";
 
 export const formatResponse = (data) => data;
 
@@ -173,7 +174,16 @@ export default {
     } = options;
 
     try {
-      let serverUrl = getSetting("server.domain");
+      const provider = getSetting("server.provider");
+      let serverUrl;
+
+      // Use effective server URL for classworkscloud provider
+      if (provider === "classworkscloud") {
+        serverUrl = getEffectiveServerUrl();
+      } else {
+        serverUrl = getSetting("server.domain");
+      }
+
       let siteKey = getSetting("server.siteKey");
       const machineId = getSetting("device.uuid");
       let configured = false;
@@ -200,6 +210,8 @@ export default {
 
           // 设置provider为classworkscloud
           setSetting("server.provider", "classworkscloud");
+          // Get effective URL after setting provider
+          serverUrl = getEffectiveServerUrl();
         } else {
           return formatError("云端配置无效，请检查服务器域名和设备UUID", "CONFIG_ERROR");
         }

src/utils/providers/kvServerProvider.js

@@ -1,6 +1,7 @@
 import axios from "@/axios/axios";
 import {formatResponse, formatError} from "../dataProvider";
 import {getSetting} from "../settings";
+import {tryWithRotation, isRotationEnabled} from "../serverRotation";
 
 // Helper function to get request headers with kvtoken
 const getHeaders = () => {
@@ -22,9 +23,18 @@ const getHeaders = () => {
 export const kvServerProvider = {
   async loadNamespaceInfo() {
     try {
-      // 使用 Classworks Cloud 或者用户配置的服务器域名
-      const serverUrl = getSetting("server.domain");
+      // Use rotation for classworkscloud provider
+      if (isRotationEnabled()) {
+        return await tryWithRotation(async (serverUrl) => {
+          const res = await axios.get(`${serverUrl}/kv/_info`, {
+            headers: getHeaders(),
+          });
+          return formatResponse(res.data);
+        });
+      }
 
+      // Standard single-server mode
+      const serverUrl = getSetting("server.domain");
       const res = await axios.get(`${serverUrl}/kv/_info`, {
         headers: getHeaders(),
       });
@@ -42,8 +52,17 @@ export const kvServerProvider = {
 
   async updateNamespaceInfo(data) {
     try {
-      const serverUrl = getSetting("server.domain");
+      // Use rotation for classworkscloud provider
+      if (isRotationEnabled()) {
+        return await tryWithRotation(async (serverUrl) => {
+          const res = await axios.put(`${serverUrl}/kv/_info`, data, {
+            headers: getHeaders(),
+          });
+          return res;
+        });
+      }
 
+      const serverUrl = getSetting("server.domain");
       const res = await axios.put(`${serverUrl}/kv/_info`, data, {
         headers: getHeaders(),
       });
@@ -59,8 +78,17 @@ export const kvServerProvider = {
 
   async loadData(key) {
     try {
-      const serverUrl = getSetting("server.domain");
+      // Use rotation for classworkscloud provider
+      if (isRotationEnabled()) {
+        return await tryWithRotation(async (serverUrl) => {
+          const res = await axios.get(`${serverUrl}/kv/${key}`, {
+            headers: getHeaders(),
+          });
+          return formatResponse(res.data);
+        });
+      }
 
+      const serverUrl = getSetting("server.domain");
       const res = await axios.get(`${serverUrl}/kv/${key}`, {
         headers: getHeaders(),
       });
@@ -80,6 +108,16 @@ export const kvServerProvider = {
 
   async saveData(key, data) {
     try {
+      // Use rotation for classworkscloud provider
+      if (isRotationEnabled()) {
+        return await tryWithRotation(async (serverUrl) => {
+          await axios.post(`${serverUrl}/kv/${key}`, data, {
+            headers: getHeaders(),
+          });
+          return formatResponse(true);
+        });
+      }
+
       const serverUrl = getSetting("server.domain");
       await axios.post(`${serverUrl}/kv/${key}`, data, {
         headers: getHeaders(),
@@ -117,8 +155,6 @@ export const kvServerProvider = {
    */
   async loadKeys(options = {}) {
     try {
-      const serverUrl = getSetting("server.domain");
-
       // 设置默认参数
       const {
         sortBy = "key",
@@ -135,6 +171,17 @@ export const kvServerProvider = {
         skip: skip.toString()
       });
 
+      // Use rotation for classworkscloud provider
+      if (isRotationEnabled()) {
+        return await tryWithRotation(async (serverUrl) => {
+          const res = await axios.get(`${serverUrl}/kv/_keys?${params}`, {
+            headers: getHeaders(),
+          });
+          return formatResponse(res.data);
+        });
+      }
+
+      const serverUrl = getSetting("server.domain");
       const res = await axios.get(`${serverUrl}/kv/_keys?${params}`, {
         headers: getHeaders(),
       });

src/utils/serverRotation.js

@@ -0,0 +1,106 @@
+/**
+ * Server rotation utility for Classworks Cloud provider
+ * Provides fallback mechanism across multiple server endpoints
+ */
+
+import { getSetting } from "./settings";
+
+// Server list for classworkscloud provider (in priority order)
+const CLASSWORKS_CLOUD_SERVERS = [
+  "https://kv-service.houlang.cloud",
+  "https://kv-service.wuyuan.dev",
+];
+
+/**
+ * Get the list of servers to try for the given provider
+ * @param {string} provider - The provider type
+ * @returns {string[]} Array of server URLs to try
+ */
+export function getServerList(provider) {
+  if (provider === "classworkscloud") {
+    return [...CLASSWORKS_CLOUD_SERVERS];
+  }
+
+  // For other providers, use the configured domain
+  const domain = getSetting("server.domain");
+  return domain ? [domain] : [];
+}
+
+/**
+ * Try an operation with server rotation fallback
+ * @param {Function} operation - Async function that takes a serverUrl and returns a promise
+ * @param {Object} options - Options
+ * @param {string} options.provider - Provider type (optional, defaults to current setting)
+ * @param {Function} options.onServerTried - Callback called when a server is tried (optional)
+ *                                           Receives: { url, status, tried } where tried is a snapshot of attempts
+ * @returns {Promise} Result from the first successful server, or throws the last error
+ */
+export async function tryWithRotation(operation, options = {}) {
+  const provider = options.provider || getSetting("server.provider");
+  const onServerTried = options.onServerTried;
+  const hasCallback = typeof onServerTried === 'function';
+
+  const servers = getServerList(provider);
+  const triedServers = [];
+  let lastError = null;
+
+  for (const serverUrl of servers) {
+    try {
+      triedServers.push({ url: serverUrl, status: "trying" });
+      if (hasCallback) {
+        // Provide a snapshot to prevent callback from mutating internal state
+        onServerTried({ url: serverUrl, status: "trying", tried: [...triedServers] });
+      }
+
+      const result = await operation(serverUrl);
+
+      triedServers[triedServers.length - 1].status = "success";
+      if (hasCallback) {
+        onServerTried({ url: serverUrl, status: "success", tried: [...triedServers] });
+      }
+
+      return result;
+    } catch (error) {
+      lastError = error;
+      triedServers[triedServers.length - 1].status = "failed";
+      triedServers[triedServers.length - 1].error = error.message || String(error);
+      if (hasCallback) {
+        onServerTried({ url: serverUrl, status: "failed", error, tried: [...triedServers] });
+      }
+
+      // Continue to next server
+      console.warn(`Server ${serverUrl} failed:`, error.message);
+    }
+  }
+
+  // All servers failed
+  console.error("All servers failed. Tried:", triedServers);
+  const error = lastError || new Error("All servers failed");
+  error.triedServers = triedServers;
+  throw error;
+}
+
+/**
+ * Get the effective server URL for the current provider
+ * For classworkscloud, returns the first server in the list
+ * For other providers, returns the configured domain
+ * @returns {string} Server URL
+ */
+export function getEffectiveServerUrl() {
+  const provider = getSetting("server.provider");
+
+  if (provider === "classworkscloud") {
+    return CLASSWORKS_CLOUD_SERVERS[0];
+  }
+
+  return getSetting("server.domain") || "";
+}
+
+/**
+ * Check if rotation is enabled for the current provider
+ * @returns {boolean}
+ */
+export function isRotationEnabled() {
+  const provider = getSetting("server.provider");
+  return provider === "classworkscloud";
+}