fix: Fix autopipeline and downgrade p-map to support Node 6. [#1216]

Author: ShogunPanda

Diff for: .travis.yml

@@ -1,11 +1,12 @@
 language: node_js
 
 node_js:
+  - "6"
   - "8"
-  - "9"
   - "10"
-  - "11"
   - "12"
+  - "14"
+  - "15"
 
 services:
   - redis-server

Diff for: lib/autoPipelining.ts

@@ -17,7 +17,7 @@ export const notAllowedAutoPipelineCommands = [
   "unpsubscribe",
 ];
 
-function findAutoPipeline(client, ...args: Array<string>): string {
+function findAutoPipeline(client, _commandName, ...args: Array<string>): string {
   if (!client.isCluster) {
     return "main";
   }

Diff for: package-lock.json

@@ -38,7 +38,7 @@
     "denque": "^1.1.0",
     "lodash.defaults": "^4.2.0",
     "lodash.flatten": "^4.4.0",
-    "p-map": "^4.0.0",
+    "p-map": "^2.1.0",
     "redis-commands": "1.6.0",
     "redis-errors": "^1.2.0",
     "redis-parser": "^3.0.0",

Diff for: package.json

@@ -1,4 +1,6 @@
 import { expect, use } from "chai";
+import * as calculateKeySlot from 'cluster-key-slot';
+
 import { default as Cluster } from "../../../lib/cluster";
 import MockServer from "../../helpers/mock_server";
 
@@ -395,14 +397,29 @@ describe("autoPipelining for cluster", function () {
     await new Promise((resolve) => cluster.once("connect", resolve));
 
     const promise1 = cluster.set("foo1", "bar");
-    const promise2 = cluster.set("foo2", "bar");
+    const promise2 = cluster.set("foo5", "bar");
+    const promise3 = cluster.set("foo2", "bar");
+    const promise4 = cluster.set("foo6", "bar");
+    
+    // Override slots to induce a failure
+    const key1Slot = calculateKeySlot('foo1');
+    const key2Slot = calculateKeySlot('foo2');
+    const key5Slot = calculateKeySlot('foo5');
+    cluster.slots[key1Slot] = cluster.slots[key2Slot];
+    cluster.slots[key2Slot] = cluster.slots[key5Slot];
 
     await expect(promise1).to.eventually.be.rejectedWith(
       "All keys in the pipeline should belong to the same slots allocation group"
     );
     await expect(promise2).to.eventually.be.rejectedWith(
       "All keys in the pipeline should belong to the same slots allocation group"
     );
+    await expect(promise3).to.eventually.be.rejectedWith(
+      "All keys in the pipeline should belong to the same slots allocation group"
+    );
+    await expect(promise4).to.eventually.be.rejectedWith(
+      "All keys in the pipeline should belong to the same slots allocation group"
+    );
 
     cluster.disconnect();
   });
@@ -411,7 +428,7 @@ describe("autoPipelining for cluster", function () {
     const cluster = new Cluster(hosts, { enableAutoPipelining: true });
 
     cluster.once("connect", () => {
-      let err1, err2;
+      let err1, err2, err3, err4;
 
       function cb() {
         expect(err1.message).to.eql(
@@ -420,6 +437,12 @@ describe("autoPipelining for cluster", function () {
         expect(err2.message).to.eql(
           "All keys in the pipeline should belong to the same slots allocation group"
         );
+        expect(err3.message).to.eql(
+          "All keys in the pipeline should belong to the same slots allocation group"
+        );
+        expect(err4.message).to.eql(
+          "All keys in the pipeline should belong to the same slots allocation group"
+        );
         expect(cluster.autoPipelineQueueSize).to.eql(0);
 
         cluster.disconnect();
@@ -431,22 +454,49 @@ describe("autoPipelining for cluster", function () {
       cluster.set("foo1", "bar1", (err) => {
         err1 = err;
 
-        if (err1 && err2) {
+        if (err1 && err2 && err3 && err4) {
           cb();
         }
       });
 
       expect(cluster.autoPipelineQueueSize).to.eql(1);
 
-      cluster.set("foo2", (err) => {
+      cluster.set("foo2", "bar2", (err) => {
         err2 = err;
 
-        if (err1 && err2) {
+        if (err1 && err2 && err3 && err4) {
           cb();
         }
       });
 
       expect(cluster.autoPipelineQueueSize).to.eql(2);
+
+      cluster.set("foo5", "bar5", (err) => {
+        err3 = err;
+
+        if (err1 && err2 && err3 && err4) {
+          cb();
+        }
+      });
+
+      expect(cluster.autoPipelineQueueSize).to.eql(3);
+
+      cluster.set("foo6", "bar6", (err) => {
+        err4 = err;
+
+        if (err1 && err2 && err3 && err4) {
+          cb();
+        }
+      });
+
+      expect(cluster.autoPipelineQueueSize).to.eql(4);
+
+      // Override slots to induce a failure
+      const key1Slot = calculateKeySlot('foo1');
+      const key2Slot = calculateKeySlot('foo2');
+      const key5Slot = calculateKeySlot('foo5');
+      cluster.slots[key1Slot] = cluster.slots[key2Slot];
+      cluster.slots[key2Slot] = cluster.slots[key5Slot];
     });
   });
 
@@ -457,13 +507,16 @@ describe("autoPipelining for cluster", function () {
     process.removeAllListeners("uncaughtException");
 
     cluster.once("connect", () => {
-      let err1;
+      let err1, err5;
 
       process.once("uncaughtException", (err) => {
         expect(err.message).to.eql("ERROR");
         expect(err1.message).to.eql(
           "All keys in the pipeline should belong to the same slots allocation group"
         );
+        expect(err5.message).to.eql(
+          "All keys in the pipeline should belong to the same slots allocation group"
+        );
 
         for (const listener of listeners) {
           process.on("uncaughtException", listener);
@@ -476,14 +529,21 @@ describe("autoPipelining for cluster", function () {
       cluster.set("foo1", "bar1", (err) => {
         err1 = err;
       });
+      cluster.set("foo5", "bar5", (err) => {
+        err5 = err;
+      });
 
-      expect(cluster.autoPipelineQueueSize).to.eql(1);
+      expect(cluster.autoPipelineQueueSize).to.eql(2);
 
       cluster.set("foo2", (err) => {
         throw new Error("ERROR");
       });
 
-      expect(cluster.autoPipelineQueueSize).to.eql(2);
+      expect(cluster.autoPipelineQueueSize).to.eql(3);
+
+      const key1Slot = calculateKeySlot('foo1');
+      const key2Slot = calculateKeySlot('foo2');
+      cluster.slots[key1Slot] = cluster.slots[key2Slot];
     });
   });
 });