Redis Is now optional

cacheManagerRedis.js

@@ -6,68 +6,141 @@ class CacheManagerRedis {
    * Example: { url: 'redis://localhost:6379' }
    */
   constructor(options) {
-    this.client = createClient(options);
+    this.options = options;
-    this.client.on('error', (err) => console.error('Redis Client Error', err));
+    this.client = createClient(this.options);
-    this.client.connect();
+    this.connected = false;
+    this.connecting = false;
+
+    this.redisErrorCount = 0;
+    this.redisErrorLimit = 3;
+
+    this.client.on('error', (err) => {
+      this.connected = false;
+
+      if (this.redisErrorCount < this.redisErrorLimit) {
+        console.error('[RedisCache] Redis Client Error:', err.message);
+        this.redisErrorCount++;
+
+        if (this.redisErrorCount === this.redisErrorLimit) {
+          console.warn('[RedisCache] Reached max Redis error log limit. Further errors will be silenced.');
+        }
+      }
+    });
+
+    this._initialConnect();
+  }
+
+  async _initialConnect() {
+    try {
+      this.connecting = true;
+      await this.client.connect();
+      this.connected = true;
+      this.redisErrorCount = 0;
+      console.log('[RedisCache] Connected to Redis.');
+    } catch (err) {
+      console.error('[RedisCache] Initial Redis connection failed:', err.message);
+      this.connected = false;
+    } finally {
+      this.connecting = false;
+    }
+  }
+
+  async _reconnectIfNeeded() {
+    if (!this.connected && !this.connecting) {
+      console.warn('[RedisCache] Attempting to reconnect to Redis...');
+      try {
+        this.connecting = true;
+        this.client = createClient(this.options);
+
+        // Reset listener and error limiter
+        this.redisErrorCount = 0;
+        this.client.on('error', (err) => {
+          this.connected = false;
+
+          if (this.redisErrorCount < this.redisErrorLimit) {
+            console.error('[RedisCache] Redis Client Error:', err.message);
+            this.redisErrorCount++;
+
+            if (this.redisErrorCount === this.redisErrorLimit) {
+              console.warn('[RedisCache] Reached max Redis error log limit. Further errors will be silenced.');
+            }
+          }
+        });
+
+        await this.client.connect();
+        this.connected = true;
+        console.log('[RedisCache] Reconnected to Redis.');
+      } catch (err) {
+        console.error('[RedisCache] Reconnection failed:', err.message);
+      } finally {
+        this.connecting = false;
+      }
+    }
   }
 
-  // Normalize input for consistent comparison
   normalize(input) {
     return input.trim().toLowerCase();
   }
 
-  // Compute the Levenshtein distance between two strings
   levenshtein(a, b) {
     const matrix = [];
-    for (let i = 0; i <= b.length; i++) {
+    for (let i = 0; i <= b.length; i++) matrix[i] = [i];
-      matrix[i] = [i];
+    for (let j = 0; j <= a.length; j++) matrix[0][j] = j;
-    }
+
-    for (let j = 0; j <= a.length; j++) {
-      matrix[0][j] = j;
-    }
     for (let i = 1; i <= b.length; i++) {
       for (let j = 1; j <= a.length; j++) {
-        if (b.charAt(i - 1) === a.charAt(j - 1)) {
+        matrix[i][j] = b.charAt(i - 1) === a.charAt(j - 1)
-          matrix[i][j] = matrix[i - 1][j - 1];
+          ? matrix[i - 1][j - 1]
-        } else {
+          : Math.min(
-          matrix[i][j] = Math.min(
+              matrix[i - 1][j - 1] + 1,
-            matrix[i - 1][j - 1] + 1,
+              matrix[i][j - 1] + 1,
-            matrix[i][j - 1] + 1,
+              matrix[i - 1][j] + 1
-            matrix[i - 1][j] + 1
+            );
-          );
-        }
       }
     }
     return matrix[b.length][a.length];
   }
 
-  // Calculate similarity between two strings (1 means identical, 0 means completely different)
   similarity(a, b) {
     const distance = this.levenshtein(a, b);
     const maxLen = Math.max(a.length, b.length);
-    if (maxLen === 0) return 1;
+    return maxLen === 0 ? 1 : 1 - distance / maxLen;
-    return 1 - distance / maxLen;
   }
 
-  // Check the cache for a result that is at least 80% similar to the new input.
   async getCachedResult(input) {
-    const normalizedInput = this.normalize(input);
+    await this._reconnectIfNeeded();
-    const keys = await this.client.keys('cache:*');
+    if (!this.connected) return null;
-    for (const key of keys) {
+
-      const storedNormalizedInput = key.slice(6); // remove "cache:" prefix
+    try {
-      const sim = this.similarity(normalizedInput, storedNormalizedInput);
+      const normalizedInput = this.normalize(input);
-      if (sim >= 0.8) {
+      const keys = await this.client.keys('cache:*');
-        const cachedOutput = await this.client.get(key);
+
-        return cachedOutput;
+      for (const key of keys) {
+        const storedNormalizedInput = key.slice(6);
+        const sim = this.similarity(normalizedInput, storedNormalizedInput);
+        if (sim >= 0.8) {
+          return await this.client.get(key);
+        }
       }
+    } catch (err) {
+      console.error('[RedisCache] Error in getCachedResult:', err.message);
+      this.connected = false;
     }
+
     return null;
   }
 
-  // Store the result in cache with key as normalized input
   async setCache(input, output) {
-    const normalizedInput = this.normalize(input);
+    await this._reconnectIfNeeded();
-    await this.client.set(`cache:${normalizedInput}`, output, { EX: 3600 });
+    if (!this.connected) return;
+
+    try {
+      const normalizedInput = this.normalize(input);
+      await this.client.set(`cache:${normalizedInput}`, output, { EX: 3600 });
+    } catch (err) {
+      console.error('[RedisCache] Error in setCache:', err.message);
+      this.connected = false;
+    }
   }
 }