🗃️ refactor: Separate Tool Cache Namespace for Blue/Green Deployments (#11738)

* 🔧 refactor: Introduce TOOL_CACHE for isolated caching of tools

- Added TOOL_CACHE key to CacheKeys enum for managing tool-related cache.
- Updated various services and controllers to utilize TOOL_CACHE instead of CONFIG_STORE for better separation of concerns in caching logic.
- Enhanced .env.example with comments on using in-memory cache for blue/green deployments.

* 🔧 refactor: Update cache configuration for in-memory storage handling

- Enhanced the handling of `FORCED_IN_MEMORY_CACHE_NAMESPACES` in `cacheConfig.ts` to default to `CONFIG_STORE` and `APP_CONFIG`, ensuring safer blue/green deployments.
- Updated `.env.example` with clearer comments regarding the usage of in-memory cache namespaces.
- Improved unit tests to validate the new default behavior and handling of empty strings for cache namespaces.

api/server/controllers/PluginController.js

@@ -8,7 +8,7 @@ const { getLogStores } = require('~/cache');
 
 const getAvailablePluginsController = async (req, res) => {
   try {
-    const cache = getLogStores(CacheKeys.CONFIG_STORE);
+    const cache = getLogStores(CacheKeys.TOOL_CACHE);
     const cachedPlugins = await cache.get(CacheKeys.PLUGINS);
     if (cachedPlugins) {
       res.status(200).json(cachedPlugins);
@@ -63,7 +63,7 @@ const getAvailableTools = async (req, res) => {
       logger.warn('[getAvailableTools] User ID not found in request');
       return res.status(401).json({ message: 'Unauthorized' });
     }
-    const cache = getLogStores(CacheKeys.CONFIG_STORE);
+    const cache = getLogStores(CacheKeys.TOOL_CACHE);
     const cachedToolsArray = await cache.get(CacheKeys.TOOLS);
 
     const appConfig = req.config ?? (await getAppConfig({ role: req.user?.role }));

api/server/controllers/PluginController.spec.js

@@ -1,3 +1,4 @@
+const { CacheKeys } = require('librechat-data-provider');
 const { getCachedTools, getAppConfig } = require('~/server/services/Config');
 const { getLogStores } = require('~/cache');
 
@@ -63,6 +64,28 @@ describe('PluginController', () => {
     });
   });
 
+  describe('cache namespace', () => {
+    it('getAvailablePluginsController should use TOOL_CACHE namespace', async () => {
+      mockCache.get.mockResolvedValue([]);
+      await getAvailablePluginsController(mockReq, mockRes);
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+    });
+
+    it('getAvailableTools should use TOOL_CACHE namespace', async () => {
+      mockCache.get.mockResolvedValue([]);
+      await getAvailableTools(mockReq, mockRes);
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+    });
+
+    it('should NOT use CONFIG_STORE namespace for tool/plugin operations', async () => {
+      mockCache.get.mockResolvedValue([]);
+      await getAvailablePluginsController(mockReq, mockRes);
+      await getAvailableTools(mockReq, mockRes);
+      const allCalls = getLogStores.mock.calls.flat();
+      expect(allCalls).not.toContain(CacheKeys.CONFIG_STORE);
+    });
+  });
+
   describe('getAvailablePluginsController', () => {
     it('should use filterUniquePlugins to remove duplicate plugins', async () => {
       // Add plugins with duplicates to availableTools