Add DualClusterClient for live testing phase of backend/frontend split

src/io/cluster/dualclusterclient.js

@@ -0,0 +1,27 @@
+import logger from 'cytube-common/lib/logger';
+import * as Switches from '../../switches';
+
+class DualClusterClient {
+    constructor(authoritativeClient, altClient) {
+        this.authoritativeClient = authoritativeClient;
+        this.altClient = altClient;
+    }
+
+    getSocketConfig(channel) {
+        return this.authoritativeClient.getSocketConfig(channel).then(result => {
+            if (!Switches.isActive(Switches.DUAL_BACKEND)) {
+                return result;
+            }
+
+            return this.altClient.getSocketConfig(channel).then(altResult => {
+                result.alt = altResult.servers;
+                return result;
+            }).catch(error => {
+                logger.warn(`Error loading alt servers: ${error}`);
+                return result;
+            });
+        })
+    }
+}
+
+export { DualClusterClient };

src/io/cluster/redisclusterclient.js

@@ -1,3 +1,8 @@
+import Promise from 'bluebird';
+
+const ONE_SECOND = 1000;
+const ERR_TIMEOUT = 'Timed out when retrieving server information';
+
 class RedisClusterClient {
     constructor(frontendPool) {
         this.frontendPool = frontendPool;
@@ -10,7 +15,7 @@ class RedisClusterClient {
             }
 
             return { servers: result };
-        });
+        }).timeout(ONE_SECOND, ERR_TIMEOUT);
     }
 }