fix: handle NOPERM error for monitor

Closes #1498

lib/Redis.ts

@@ -357,14 +357,15 @@ class Redis extends Commander {
    * });
    * ```
    */
-  monitor(callback: Callback<Redis>): Promise<Redis> {
+  monitor(callback?: Callback<Redis>): Promise<Redis> {
     const monitorInstance = this.duplicate({
       monitor: true,
       lazyConnect: false,
     });
 
     return asCallback(
-      new Promise(function (resolve) {
+      new Promise(function (resolve, reject) {
+        monitorInstance.once("error", reject);
         monitorInstance.once("monitoring", function () {
           resolve(monitorInstance);
         });
@@ -443,16 +444,15 @@ class Redis extends Commander {
 
     if (!writable) {
       if (!this.options.enableOfflineQueue) {
-        command.reject(new Error(
-          "Stream isn't writeable and enableOfflineQueue options is false"
-        ));
+        command.reject(
+          new Error(
+            "Stream isn't writeable and enableOfflineQueue options is false"
+          )
+        );
         return command.promise;
       }
 
-      if (
-        command.name === "quit" &&
-        this.offlineQueue.length === 0
-      ) {
+      if (command.name === "quit" && this.offlineQueue.length === 0) {
         this.disconnect();
         command.resolve(Buffer.from("OK"));
         return command.promise;

lib/redis/event_handler.ts

@@ -230,7 +230,10 @@ export function readyHandler(self) {
     self.retryAttempts = 0;
 
     if (self.options.monitor) {
-      self.call("monitor");
+      self.call("monitor").then(
+        () => self.setStatus("monitoring"),
+        (error: Error) => self.emit("error", error)
+      );
       const { sendCommand } = self;
       self.sendCommand = function (command) {
         if (Command.checkFlag("VALID_IN_MONITOR_MODE", command.name)) {
@@ -244,7 +247,6 @@ export function readyHandler(self) {
       self.once("close", function () {
         delete self.sendCommand;
       });
-      self.setStatus("monitoring");
       return;
     }
     const finalSelect = self.prevCondition

package.json

@@ -57,6 +57,7 @@
     "@semantic-release/commit-analyzer": "^9.0.2",
     "@semantic-release/git": "^10.0.1",
     "@types/chai": "^4.3.0",
+    "@types/chai-as-promised": "^7.1.5",
     "@types/debug": "^4.1.5",
     "@types/lodash.defaults": "^4.2.6",
     "@types/lodash.isarguments": "^3.1.6",

test/functional/monitor.ts

@@ -1,8 +1,10 @@
 import Redis from "../../lib/Redis";
-import { expect } from "chai";
+import { expect, use } from "chai";
 import * as sinon from "sinon";
 import { waitForMonitorReady } from "../helpers/util";
 
+use(require("chai-as-promised"));
+
 describe("monitor", () => {
   it("should receive commands", (done) => {
     const redis = new Redis();
@@ -74,4 +76,17 @@ describe("monitor", () => {
       });
     });
   });
+
+  it("rejects when monitor is disabled", async () => {
+    await new Redis().acl(
+      "SETUSER",
+      "nomonitor",
+      "reset",
+      "+info",
+      ">123456",
+      "on"
+    );
+    const redis = new Redis({ username: "nomonitor", password: "123456" });
+    expect(redis.monitor()).to.eventually.be.rejectedWith(/NOPERM/);
+  });
 });