refactor: minor perf improvements (#497)

Author: suhaotian

lib/cluster-adapter.ts

@@ -625,8 +625,9 @@ export abstract class ClusterAdapterWithHeartbeat extends ClusterAdapter {
   }
 
   override serverCount(): Promise<number> {
+    const now = Date.now();
     this.nodesMap.forEach((lastSeen, uid) => {
-      const nodeSeemsDown = Date.now() - lastSeen > this._opts.heartbeatTimeout;
+      const nodeSeemsDown = now - lastSeen > this._opts.heartbeatTimeout;
       if (nodeSeemsDown) {
         debug("node %s seems down", uid);
         this.nodesMap.delete(uid);

lib/index.ts

@@ -908,7 +908,7 @@ export class RedisAdapter extends Adapter {
         )
       ).then((values) => {
         let numSub = 0;
-        values.map((value) => {
+        values.forEach((value) => {
           numSub += parseInt(value[1], 10);
         });
         return numSub;

lib/sharded-adapter.ts

@@ -118,11 +118,11 @@ class ShardedRedisAdapter extends ClusterAdapter {
     ) {
       return Promise.all(
         this.pubClient.nodes().map((node) => {
-          node.sendCommand(["PUBSUB", "SHARDNUMSUB", this.channel]);
+          return node.sendCommand(["PUBSUB", "SHARDNUMSUB", this.channel]);
         })
       ).then((values) => {
         let numSub = 0;
-        values.map((value) => {
+        values.forEach((value) => {
           numSub += parseInt(value[1], 10);
         });
         return numSub;