Remove usage of _.random

dev/bulkhead.js

@@ -2,7 +2,7 @@
 
 const _ = require("lodash");
 const ServiceBroker = require("../src/service-broker");
-const E = require("../src/errors");
+const { randomInt } = require("../src/utils");
 
 const broker = new ServiceBroker({
 	bulkhead: {
@@ -31,7 +31,7 @@ broker.createService({
 				concurrency: 1
 			},
 			async handler(ctx) {
-				await this.Promise.delay(_.random(500, 2500));
+				await this.Promise.delay(randomInt(500, 2500));
 
 				this.logger.info("First called.", ctx.params);
 
@@ -45,7 +45,7 @@ broker.createService({
 				concurrency: 1
 			},
 			async handler(ctx) {
-				await this.Promise.delay(_.random(500, 2500));
+				await this.Promise.delay(randomInt(500, 2500));
 
 				this.logger.info("Second called.", ctx.params);
 
@@ -62,15 +62,15 @@ broker.createService({
 			},
 			async handler(ctx) {
 				this.logger.info("Event received.", ctx.params);
-				await this.Promise.delay(_.random(500, 2500));
+				await this.Promise.delay(randomInt(500, 2500));
 				this.logger.info("User created.", ctx.params);
 			}
 		},
 
 		"post.created": {
 			async handler(ctx) {
 				this.logger.info("Event received.", ctx.params);
-				await this.Promise.delay(_.random(500, 2500));
+				await this.Promise.delay(randomInt(500, 2500));
 				this.logger.info("Post created.", ctx.params);
 			}
 		}

dev/client.js

@@ -3,10 +3,9 @@
 const _ = require("lodash");
 const kleur = require("kleur");
 const fs = require("fs");
-const { MoleculerError, MoleculerRetryableError } = require("../src/errors");
-const Middlewares = require("..").Middlewares;
 
 const ServiceBroker = require("../src/service-broker");
+const { randomInt } = require("../src/utils");
 
 // Create broker
 const broker = new ServiceBroker({
@@ -138,9 +137,8 @@ broker.createService({
 	actions: {
 		add(ctx) {
 			broker.logger.info(_.padEnd(`${ctx.params.count}. Add ${ctx.params.a} + ${ctx.params.b}`, 20), `(from: ${ctx.nodeID})`);
-			if (_.random(100) > 70)
+			if (randomInt(100) > 70)
 				return this.Promise.reject(new MoleculerRetryableError("Random error!", 510));
-
 			return {
 				count: ctx.params.count,
 				res: Number(ctx.params.a) + Number(ctx.params.b)
@@ -173,7 +171,7 @@ broker
 				pendingInfo = ` [${pendingReqs.join(",")}]`;
 			}
 
-			const payload = { a: _.random(0, 10), b: _.random(0, 10) };
+			const payload = { a: randomInt(0, 10), b: randomInt(0, 10) };
 			const count = ++reqCount;
 			pendingReqs.push(count);
 			let p = broker.call("math.add", payload, { meta: { count } });

dev/gossip-viz.js

@@ -3,10 +3,11 @@
 const _ = require("lodash");
 const kleur = require("kleur");
 const ServiceBroker = require("../src/service-broker");
+const { randomInt } = require("../src/utils");
 
 const COUNT = process.argv[2] ? Number(process.argv[2]) : 20;
 const nodePrefix = process.argv[3] || "node";
-const namespace = "viz-" + Math.round(_.random(100));
+const namespace = "viz-" + randomInt(100);
 
 console.log(`Create ${COUNT} nodes...`);
 
@@ -55,8 +56,8 @@ Promise.all(brokers.map(({ broker }) => broker.start())).then(() => {
 		printStatuses();
 	}, 1000);
 
-	const timer = setInterval(() => {
-		const idx = _.random(brokers.length - 1);
+	setInterval(() => {
+		const idx = randomInt(brokers.length - 1);
 		const { nodeID, broker } = brokers[idx];
 
 		if (broker) {

dev/server.js

@@ -1,11 +1,9 @@
 "use strict";
 
-const path = require("path");
 const _ = require("lodash");
-const kleur = require("kleur");
 const ServiceBroker = require("../src/service-broker");
-const { MoleculerError, MoleculerRetryableError } = require("../src/errors");
-const Middlewares = require("../src/middlewares");
+const { MoleculerRetryableError } = require("../src/errors");
+const { randomInt } = require("../src/utils");
 
 // Create broker
 const broker = new ServiceBroker({
@@ -83,12 +81,11 @@ broker.createService({
 			//fallback: (ctx, err) => ({ count: ctx.params.count, res: 999, fake: true }),
 			//fallback: "fakeResult",
 			handler(ctx) {
-				const wait = _.random(500, 1500);
 				this.logger.info(
 					_.padEnd(`${ctx.meta.count}. Add ${ctx.params.a} + ${ctx.params.b}`, 20),
 					`(from: ${ctx.nodeID})`
 				);
-				if (_.random(100) > 80)
+				if (randomInt(100) > 80)
 					return this.Promise.reject(
 						new MoleculerRetryableError("Random error!", 510, "RANDOM_ERROR")
 					);

dev/sharding.js

@@ -1,5 +1,6 @@
-const ServiceBroker = require("../src/service-broker");
 const _ = require("lodash");
+const ServiceBroker = require("../src/service-broker");
+const { randomInt } = require("../src/utils");
 
 function createBroker(opts) {
 	const broker = new ServiceBroker(
@@ -39,7 +40,7 @@ function createBroker(opts) {
 					},
 					handler(ctx) {
 						//this.logger.warn(`Called '${this.broker.nodeID}' with '${ctx.params.name}'`);
-						return 20 + _.random(60);
+						return 20 + randomInt(60);
 					}
 				}
 			}
@@ -69,7 +70,7 @@ async function start() {
 	const usernames = ["john", "bob", "adam", "steve", "mark"];
 
 	setInterval(async () => {
-		const name = usernames[_.random(usernames.length - 1)];
+		const name = usernames[randomInt(usernames.length - 1)];
 		await main.call("users.getAge", { name });
 	}, 1000);
 }

dev/tracing.js

@@ -15,7 +15,7 @@ const ServiceBroker = require("../src/service-broker");
 
 const { MoleculerError } = require("../src/errors");
 const _ = require("lodash");
-const { inspect } = require("util");
+const { randomInt } = require("../src/utils");
 
 const THROW_ERR = false;
 
@@ -244,7 +244,7 @@ broker.createService({
 			},
 			async handler(ctx) {
 				const span1 = ctx.startSpan("Fake delay");
-				//await this.Promise.delay(10 + _.random(30));
+				// await this.Promise.delay(10 + randomInt(30));
 				ctx.finishSpan(span1);
 				return ctx.params.postID * 3;
 			}
@@ -265,7 +265,7 @@ broker.createService({
 						userID: ctx.params.userID
 					});
 
-				await this.Promise.delay(_.random(10));
+				await this.Promise.delay(randomInt(10));
 				return ctx.params.userID * 3;
 			}
 		}
@@ -280,7 +280,7 @@ broker.createService({
 		count: {
 			tracing: true,
 			async handler(ctx) {
-				//await this.Promise.delay(_.random(50));
+				// await this.Promise.delay(randomInt(50));
 				return Math.round(Math.random() * 10);
 			}
 		}
@@ -295,7 +295,7 @@ broker.createService({
 		count: {
 			tracing: true,
 			async handler(ctx) {
-				//await this.Promise.delay(_.random(50));
+				// await this.Promise.delay(randomInt(50));
 				return Math.round(Math.random() * 10);
 			}
 		}

examples/client-server/client.js

@@ -6,6 +6,8 @@ let kleur = require("kleur");
 
 let ServiceBroker = require("../../src/service-broker");
 
+const { randomInt } = require("../../src/utils");
+
 let transporter = process.env.TRANSPORTER || "TCP";
 
 // Create broker
@@ -81,7 +83,7 @@ broker
 				pendingInfo = ` [${pendingReqs.join(",")}]`;
 			}
 
-			let payload = { a: _.random(0, 100), b: _.random(0, 100), count: ++reqCount };
+			let payload = { a: randomInt(0, 100), b: randomInt(0, 100), count: ++reqCount };
 			pendingReqs.push(reqCount);
 			let p = broker.call("math.add", payload);
 			if (p.ctx) {

examples/client-server/server.js

@@ -1,10 +1,8 @@
 "use strict";
 
 let _ = require("lodash");
-let kleur = require("kleur");
 
 let ServiceBroker = require("../../src/service-broker");
-let { MoleculerError } = require("../../src/errors");
 
 let transporter = process.env.TRANSPORTER || "TCP";
 
@@ -23,7 +21,7 @@ broker.createService({
 	name: "math",
 	actions: {
 		add(ctx) {
-			// if (_.random(100) > 90) {
+			// if (randomInt(100) > 90) {
 			// 	this.logger.info(kleur.bold.red("Throw random error..."));
 			// 	throw new MoleculerError("Random error!", 510);
 			// }

examples/multi-nodes/node-controller.service.js

@@ -3,7 +3,7 @@
 const _ = require("lodash");
 const kleur = require("kleur");
 const cluster = require("cluster");
-const { humanize } = require("../../src/utils");
+const { humanize, randomInt } = require("../../src/utils");
 
 const padS = _.padStart;
 const padE = _.padEnd;
@@ -67,7 +67,7 @@ module.exports = {
 				this.logger.info(`Stopping ${this.nodes.length - num} nodes...`);
 				const tmp = Array.from(this.nodes);
 				return _.times(this.nodes.length - num, () => {
-					const idx = _.random(tmp.length - 1);
+					const idx = randomInt(tmp.length - 1);
 					const node = tmp.splice(idx, 1)[0];
 					if (opts.kill) return this.killNode(node);
 					else return this.stopNode(node);

examples/post.service.js

@@ -3,13 +3,17 @@
 let _ = require("lodash");
 let fakerator = require("fakerator")();
 
+const { randomInt } = require("../src/utils");
+
 module.exports = function () {
-	let posts = fakerator.times(fakerator.entity.post, 10);
+	const posts = fakerator.times(fakerator.entity.post, 10);
+
+	for (let i = 0; i < posts.length; i++) {
+		const post = posts[i];
 
-	_.each(posts, (post, i) => {
 		post.id = i + 1;
-		post.author = _.random(1, 5);
-	});
+		post.author = randomInt(1, 5);
+	}
 
 	return {
 		name: "posts",

src/registry/discoverers/etcd3.js

@@ -11,7 +11,7 @@ const kleur = require("kleur");
 const BaseDiscoverer = require("./base");
 const { METRIC } = require("../../metrics");
 const Serializers = require("../../serializers");
-const { removeFromArray } = require("../../utils");
+const { removeFromArray, randomInt } = require("../../utils");
 const P = require("../../packets");
 const C = require("../../constants");
 
@@ -43,7 +43,7 @@ class Etcd3Discoverer extends BaseDiscoverer {
 		});
 
 		// Loop counter for full checks. Starts from a random value for better distribution
-		this.idx = this.opts.fullCheck > 1 ? _.random(this.opts.fullCheck - 1) : 0;
+		this.idx = this.opts.fullCheck > 1 ? randomInt(this.opts.fullCheck - 1) : 0;
 
 		// Etcd client instance
 		this.client = null;

src/registry/discoverers/redis.js

@@ -12,7 +12,7 @@ const { BrokerOptionsError } = require("../../errors");
 const BaseDiscoverer = require("./base");
 const { METRIC } = require("../../metrics");
 const Serializers = require("../../serializers");
-const { removeFromArray, isFunction } = require("../../utils");
+const { removeFromArray, isFunction, randomInt } = require("../../utils");
 const P = require("../../packets");
 const C = require("../../constants");
 
@@ -43,7 +43,7 @@ class RedisDiscoverer extends BaseDiscoverer {
 		});
 
 		// Loop counter for full checks. Starts from a random value for better distribution
-		this.idx = this.opts.fullCheck > 1 ? _.random(this.opts.fullCheck - 1) : 0;
+		this.idx = this.opts.fullCheck > 1 ? randomInt(this.opts.fullCheck - 1) : 0;
 
 		// Redis client instance
 		this.client = null;

src/strategies/shard.js

@@ -10,7 +10,7 @@ const _ = require("lodash");
 const BaseStrategy = require("./base");
 const crypto = require("crypto");
 const LRU = require("lru-cache");
-const { isFunction } = require("../utils");
+const { isFunction, randomInt } = require("../utils");
 
 /**
  * Sharding invocation strategy
@@ -67,7 +67,8 @@ class ShardStrategy extends BaseStrategy {
 	 * @memberof ShardStrategy
 	 */
 	select(list, ctx) {
-		let key = this.getKeyFromContext(ctx);
+		const key = this.getKeyFromContext(ctx);
+
 		if (key != null) {
 			if (this.needRebuild) this.rebuild(list);
 
@@ -76,7 +77,7 @@ class ShardStrategy extends BaseStrategy {
 		}
 
 		// Return a random item (no key)
-		return list[_.random(0, list.length - 1)];
+		return list[randomInt(0, list.length - 1)];
 	}
 
 	/**

src/transporters/tcp/udp-broadcaster.js

@@ -10,7 +10,8 @@ const EventEmitter = require("events");
 const os = require("os");
 const dgram = require("dgram");
 const ipaddr = require("ipaddr.js");
-const _ = require("lodash");
+const { randomInt } = require("../../../src/utils");
+
 /**
  * UDP Discovery Server for TcpTransporter
  *
@@ -87,7 +88,7 @@ class UdpServer extends EventEmitter {
 			})
 			.then(() => {
 				// Send first discover message after ~1 sec
-				setTimeout(() => this.discover(), _.random(500) + 500);
+				setTimeout(() => this.discover(), randomInt(500) + 500);
 
 				this.startDiscovering();
 			});

src/utils.js

@@ -620,6 +620,34 @@ const utils = {
 					.map(x => x.trim())
 					.filter(Boolean)
 			: [];
+	},
+
+	/**
+	 * Produces a random floating number between the inclusive lower and upper bounds.
+	 *
+	 * @param {Number} a
+	 * @param {Number} b
+	 * @returns {Number}
+	 */
+	random(a = 1, b = 0) {
+		const lower = Math.min(a, b);
+		const upper = Math.max(a, b);
+
+		return lower + Math.random() * (upper - lower);
+	},
+
+	/**
+	 * Produces a random integer number between the inclusive lower and upper bounds.
+	 *
+	 * @param {Number} a
+	 * @param {Number} b
+	 * @returns {Number}
+	 */
+	randomInt(a = 1, b = 0) {
+		const lower = Math.ceil(Math.min(a, b));
+		const upper = Math.floor(Math.max(a, b));
+
+		return Math.floor(lower + Math.random() * (upper - lower + 1));
 	}
 };