fix(cluster): lazyConnect with pipeline

lib/autoPipelining.ts

@@ -1,5 +1,5 @@
 import * as PromiseContainer from "./promiseContainer";
-import { flatten, isArguments } from "./utils/lodash";
+import { flatten, isArguments, noop } from "./utils/lodash";
 import * as calculateSlot from "cluster-key-slot";
 import asCallback from "standard-as-callback";
 
@@ -110,6 +110,7 @@ export function executeWithAutoPipelining(
 
   // On cluster mode let's wait for slots to be available
   if (client.isCluster && !client.slots.length) {
+    if (client.status === "wait") client.connect().catch(noop);
     return new CustomPromise(function (resolve, reject) {
       client.delayUntilReady((err) => {
         if (err) {

lib/pipeline.ts

@@ -7,6 +7,7 @@ import * as pMap from "p-map";
 import * as PromiseContainer from "./promiseContainer";
 import { CallbackFunction } from "./types";
 import Commander from "./commander";
+import { noop } from "./utils";
 
 /*
   This function derives from the cluster-key-slot implementation.
@@ -16,7 +17,7 @@ import Commander from "./commander";
 function generateMultiWithNodes(redis, keys) {
   const slot = calculateSlot(keys[0]);
   const target = redis._groupsBySlot[slot];
-  
+
   for (let i = 1; i < keys.length; i++) {
     if (redis._groupsBySlot[calculateSlot(keys[i])] !== target) {
       return -1;
@@ -156,7 +157,8 @@ Pipeline.prototype.fillResult = function (value, position) {
         moved: function (slot, key) {
           _this.preferKey = key;
           _this.redis.slots[errv[1]] = [key];
-          _this.redis._groupsBySlot[errv[1]] = _this.redis._groupsIds[_this.redis.slots[errv[1]].join(";")];
+          _this.redis._groupsBySlot[errv[1]] =
+            _this.redis._groupsIds[_this.redis.slots[errv[1]].join(";")];
           _this.redis.refreshSlotsCache();
           _this.exec();
         },
@@ -241,6 +243,7 @@ Pipeline.prototype.execBuffer = deprecate(function () {
 Pipeline.prototype.exec = function (callback: CallbackFunction) {
   // Wait for the cluster to be connected, since we need nodes information before continuing
   if (this.isCluster && !this.redis.slots.length) {
+    if (this.redis.status === "wait") this.redis.connect().catch(noop);
     this.redis.delayUntilReady((err) => {
       if (err) {
         callback(err);

lib/transaction.ts

@@ -1,4 +1,4 @@
-import { wrapMultiResult } from "./utils";
+import { wrapMultiResult, noop } from "./utils";
 import asCallback from "standard-as-callback";
 import Pipeline from "./pipeline";
 import { CallbackFunction } from "./types";
@@ -30,6 +30,7 @@ export function addTransactionSupport(redis) {
     pipeline.exec = function (callback: CallbackFunction) {
       // Wait for the cluster to be connected, since we need nodes information before continuing
       if (this.isCluster && !this.redis.slots.length) {
+        if (this.redis.status === "wait") this.redis.connect().catch(noop);
         return asCallback(
           new Promise((resolve, reject) => {
             this.redis.delayUntilReady((err) => {

test/functional/cluster/autopipelining.ts

@@ -594,4 +594,26 @@ describe("autoPipelining for cluster", function () {
       changeSlot(cluster, key1Slot, key2Slot);
     });
   });
+
+  it("should support lazyConnect", async () => {
+    const cluster = new Cluster(hosts, {
+      enableAutoPipelining: true,
+      lazyConnect: true,
+    });
+
+    await cluster.set("foo1", "bar1");
+    await cluster.set("foo5", "bar5");
+
+    expect(
+      await Promise.all([
+        cluster.get("foo1"),
+        cluster.get("foo5"),
+        cluster.get("foo1"),
+        cluster.get("foo5"),
+        cluster.get("foo1"),
+      ])
+    ).to.eql(["bar1", "bar5", "bar1", "bar5", "bar1"]);
+
+    cluster.disconnect();
+  });
 });

test/functional/lazy_connect.ts

@@ -2,6 +2,7 @@ import Redis from "../../lib/redis";
 import { expect } from "chai";
 import * as sinon from "sinon";
 import { Cluster } from "../../lib";
+import Pipeline from "../../lib/pipeline";
 
 describe("lazy connect", function () {
   it("should not call `connect` when init", function () {
@@ -51,6 +52,28 @@ describe("lazy connect", function () {
       stub.restore();
     });
 
+    it("should call connect when pipeline exec", (done) => {
+      const stub = sinon.stub(Cluster.prototype, "connect").callsFake(() => {
+        stub.restore();
+        done();
+      });
+      const cluster = new Cluster([], { lazyConnect: true });
+      const pipline = new Pipeline(cluster);
+      pipline.get("fool1").exec(() => {});
+    });
+
+    it("should call connect when transction exec", (done) => {
+      const stub = sinon.stub(Cluster.prototype, "connect").callsFake(() => {
+        stub.restore();
+        done();
+      });
+      const cluster = new Cluster([], { lazyConnect: true });
+      cluster
+        .multi()
+        .get("fool1")
+        .exec(() => {});
+    });
+
     it('should quit before "close" being emited', function (done) {
       const stub = sinon
         .stub(Cluster.prototype, "connect")