Add max redis response time for reads

Author: ajayyy

src/config.ts

@@ -165,6 +165,7 @@ addDefaults(config, {
         commandsQueueMaxLength: 3000,
         stopWritingAfterResponseTime: 50,
         responseTimePause: 1000,
+        maxReadResponseTime: 500,
         disableHashCache: false,
         clientCacheSize: 2000,
         useCompression: false,

src/types/config.model.ts

@@ -10,6 +10,7 @@ interface RedisConfig extends redis.RedisClientOptions {
     maxWriteConnections: number;
     stopWritingAfterResponseTime: number;
     responseTimePause: number;
+    maxReadResponseTime: number;
     disableHashCache: boolean;
     clientCacheSize: number;
     useCompression: boolean;

src/utils/redis.ts

@@ -222,6 +222,12 @@ if (config.redis?.enabled) {
             return;
         }
 
+        if (config.redis.maxReadResponseTime && activeRequests > maxStoredTimes
+                && readResponseTime[readResponseTime.length - 1] > config.redis.maxReadResponseTime) {
+            reject(new TooManyActiveConnectionsError(`Redis response time too high in general: ${readResponseTime[readResponseTime.length - 1]}ms with ${activeRequests} connections`));
+            return;
+        }
+
         // For tracking
         if (!shouldClientCacheKey(key)) memoryCacheUncachedMisses++;