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Home > Web Development > Server Side Web Development > Mastering Node.js
Mastering Node.js
Mastering Node.js

Mastering Node.js: Build robust and scalable real-time server-side web applications efficiently , Second Edition

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Mastering Node.js

Understanding Asynchronous Event-Driven Programming

"The best way to predict the future is to invent it."
– Alan Kay

Eliminating blocking processes through the use of event-driven, asynchronous I/O is Node's primary organizational principle. We've learned how this design helps developers in shaping information and adding capacity. Node lets you build and organize lightweight, independent, and share-nothing processes that communicate through callbacks and synchronize with a predictable event loop.

Accompanying the growth in the popularity of Node is a growth in the number of well-designed event-driven systems and applications. For a new technology to be successful, it must eliminate the existing problems, and/or offer to consumers a better solution at a lower cost in terms of time, effort, or price. In its young and fertile lifespan, the Node community...

Node's unique design

First, let's take an accurate look at the total time cost when your program asks the system to perform different kinds of services. I/O is expensive. In the following chart (taken from Ryan Dahl's original presentation on Node), we can see how many clock cycles typical system tasks consume. The relative cost of I/O operations is striking:

L1 cache
3 cycles
L2 cache 14 cycles
RAM
250 cycles
Disk 41,000,000 cycles
Network 240,000,000 cycles

The reasons are clear enough: a disk is a physical device, a spinning metal platter — storing and retrieving that data is much slower than moving data between solid-state devices (such as microprocessors and memory chips), or indeed optimized on-chip L1/L2 caches. Similarly, data does not move from point to point on a network instantaneously. Light itself needs 0...

Understanding the event loop

The following three points are important to remember, as we break down the event loop:

  • The event loop runs in the same (single) thread your JavaScript code runs in. Blocking the event loop means blocking the entire thread.
  • You don't start and/or stop the event loop. The event loop starts as soon as a process starts, and ends when no further callbacks remain to be performed. The event loop may, therefore, run forever.
  • The event loop delegates many I/O operations to libuv, which manages these operations (using the power of the OS itself, such as thread pools), notifying the event loop when results are available. An easy-to-reason-about single-threaded programming model is reinforced with the efficiency of multithreading.

For example, the following while loop will never terminate:

let stop = false;
setTimeout(() => {
  stop = true;
}, 1000);

while...

Listening for events

Modern network software, for various reasons, is growing in complexity and, in many ways, changing how we think about application development. Most new platforms and languages are attempting to address these changes. Node is no exception — and JavaScript is no exception.

Learning about Node means learning about event-driven programming, composing software out of modules, creating and linking data streams, and producing and consuming events and their related data. Node-based architectures are often composed of many small processes and/or services communicating with events — internally, by extending the EventEmitter interface and using callbacks, and externally, over one of several common transport layers (for example, HTTP, TCP), or through a thin messaging layer covering one of these transport layers (for example, 0MQ, Redis PUBSUB, and Kafka...

Timers

Timers are used to schedule events in the future. They are used when one seeks to delay the execution of some block of code until a specified number of milliseconds have passed, to schedule periodic execution of a particular function, and so on.

JavaScript provides two asynchronous timers: setInterval() and setTimeout(). It is assumed that the reader is fully aware of how to set (and cancel) these timers, so very little time will be spent discussing the syntax. We'll instead focus more on gotchas and less well-known details about timeouts and intervals.

The key takeaway will be this: when using timers, one should make no assumptions about the amount of actual time that will expire before the callback registered for this timer fires, or about the ordering of callbacks. Node timers are not interrupts. Timers simply promise to execute as close as possible to the specified...

Concurrency and errors

Members of the Node community develop new packages and projects every day. Because of Node's evented nature, callbacks permeate these codebases. We've considered several of the key ways in which events might be queued, dispatched, and handled through the use of callbacks. Let's spend a little time outlining the best practices, in particular, about conventions for designing callbacks and handling errors, and discuss some useful patterns when designing complex chains of events and callbacks. In particular, let's look at the new Promise, Generator, and async/await patterns that you will see in this book, and other examples of modern Node code.

Managing concurrency

Simplifying control...

Building a Twitter feed using file events

Let's apply what we've learned. The goal is to create a server that a client can connect to and receive updates from Twitter. We will first create a process to query Twitter for any messages with the hashtag #nodejs, and write any found messages to a tweets.txt file in 140-byte chunks. We will then create a network server that broadcasts these messages to a single client. Those broadcasts will be triggered by write events on the tweets.txt file. Whenever a write occurs, 140-byte chunks are asynchronously read from the last-known client read pointer. This will happen until we reach the end of the file, broadcasting as we go. Finally, we will create a simple client.html page, which asks for, receives, and displays these messages.

While this example is certainly contrived, it demonstrates:

  • Listening to the filesystem for changes...

Summary

Programming with events is not always easy. The control and context switches, defining the paradigm, often confound those new to evented systems. This seemingly reckless loss of control and the resulting complexity drives many developers away from these ideas. Students in introductory programming courses normally develop a mindset in which program flow can be dictated, where a program whose execution flow does not proceed sequentially from A to B can bend understanding.

By examining the evolution of the architectural problems, Node is now attempting to solve for network applications—in terms of scaling and code organization, in general terms of data and complexity volume, in terms of state awareness, and in terms of well-defined data and process boundaries. We learned how managing these event queues can be done intelligently. We saw how different event sources...

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Key benefits

  • Packed with practical examples and explanations, Mastering Node.js contains everything you need to take your applications to the next level.
  • Unleash the full potential of Node.js 9 to build real-time and scalable applications.
  • Gain in-depth knowledge of asynchronous programming, event loops, and parallel data processing.
  • Explore Node's innovative event-non-blocking design, and build professional applications with the help of detailed examples.

Description

Node.js, a modern development environment that enables developers to write server- and client-side code with JavaScript, thus becoming a popular choice among developers. This book covers the features of Node that are especially helpful to developers creating highly concurrent real-time applications. It takes you on a tour of Node's innovative event non-blocking design, showing you how to build professional applications. This edition has been updated to cover the latest features of Node 9 and ES6. All code examples and demo applications have been completely rewritten using the latest techniques, introducing Promises, functional programming, async/await, and other cutting-edge patterns for writing JavaScript code. Learn how to use microservices to simplify the design and composition of distributed systems. From building serverless cloud functions to native C++ plugins, from chatbots to massively scalable SMS-driven applications, you'll be prepared for building the next generation of distributed software. By the end of this book, you'll be building better Node applications more quickly, with less code and more power, and know how to run them at scale in production environments.

Who is this book for?

This book is targeted at JavaScript developers who want to take an in-depth look at the latest Node.js framework to create faster, scalable, real-time backend applications. Basic JavaScript programming knowledge—and also some previous Node.js development experience—are mandatory to get the best out of this book

What you will learn

  • Build an Electron desktop app using Node that manages a filesystem
  • Explore Streams and understand how they apply to building networked services
  • Develop and deploy an SMS-driven customer service application
  • Use WebSockets for rapid bi-directional communication
  • Construct serverless applications with Amazon Lambda
  • Test and debug with headless browsers, CPU profiling, Mocha, Sinon, and more
  • Scale applications vertically and horizontally across multiple cores and web services
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Table of Contents

12 Chapters
Understanding the Node Environment Chevron down icon Chevron up icon
Understanding the Node Environment
Introduction – JavaScript as a systems language
Standard libraries
Extending JavaScript
V8, JavaScript, and optimizations
The process object
The REPL
Summary
Understanding Asynchronous Event-Driven Programming Chevron down icon Chevron up icon
Understanding Asynchronous Event-Driven Programming
Node's unique design
Understanding the event loop
Listening for events
Timers
Concurrency and errors
Building a Twitter feed using file events
Summary
Streaming Data Across Nodes and Clients Chevron down icon Chevron up icon
Streaming Data Across Nodes and Clients
Why use streams?
Exploring streams
Creating an HTTP server
HTTPS, TLS (SSL), and securing your server
The request object
Working with headers
Handling POST data
Creating and streaming images with Node
Summary
Using Node to Access the Filesystem Chevron down icon Chevron up icon
Using Node to Access the Filesystem
Directories, and iterating over files and folders
Reading from a file
Writing to a file
Serving static files
Handling file uploads
A simple file browser
Summary
Managing Many Simultaneous Client Connections Chevron down icon Chevron up icon
Managing Many Simultaneous Client Connections
Understanding concurrency
Routing requests
Using Redis for tracking client state
Handling sessions
Authenticating connections
Summary
Further reading
Creating Real-Time Applications Chevron down icon Chevron up icon
Creating Real-Time Applications
Introducing AJAX
Bidirectional communication with socket.io
Listening for Server Sent Events
Building a collaborative document editing application
Summary
Using Multiple Processes Chevron down icon Chevron up icon
Using Multiple Processes
Node's single-threaded model
Creating child processes
Communicating with your child
Parsing a file using multiple processes
Using PM2 to manage multiple processes
Real-time activity updates of multiple worker results
Summary
Scaling Your Application Chevron down icon Chevron up icon
Scaling Your Application
When to scale?
Running multiple Node servers
Message queues – RabbitMQ
Using Node's UDP module
Using Amazon Web Services in your application
Using Twilio to create an SMS bot on Heroku
Summary
Microservices Chevron down icon Chevron up icon
Microservices
Why microservices?
From 3-Tiers to 4-Tiers
Deploying microservices
Serverless applications
Containerized microservices
Summary
Testing Your Application Chevron down icon Chevron up icon
Testing Your Application
Why testing is important
Native Node testing and debugging tools
Testing with Mocha, Chai, and Sinon
Headless testing with Nightmare and Puppeteer
Testing the terrain
Testing processes, memory, and CPU
Summary
Organizing Your Work into Modules Chevron down icon Chevron up icon
Organizing Your Work into Modules
How to load and use modules
The module object
How Node handles module paths
Creating a package file
Creating Your Own C++ Add-ons Chevron down icon Chevron up icon
Creating Your Own C++ Add-ons
Hello World
A calculator
Using NAN
Closing thoughts
Links and resources

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Full star icon Full star icon Full star icon Half star icon Empty star icon 3.6
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Darrel O'Pry Feb 01, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This in depth book on Node.js 9.x provides a takes a deep dive into the history, internals, use cases, and API's of Node.KS. More importantly, the updated edition adds insight into the new features of 9.x such as async/await, gives an excellent overview of micro-services architecture, walks through working with Kubernetes locally to speed up development and prepare for production deployments, and takes a run at debugging and testing. This is a great read for new Node.JS developers, and experienced developers looking to get up to speed with Node 9.x and current best practices.
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Cheung Wai Lok Oct 10, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
It seems to be the best nodejs book i have ever discovered
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poplinr Feb 01, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I remember buying the first edition of this book back in 2013 when I didn’t know what the hell I was doing the software world. Reading through a few chapters of this second edition, I was impressed at the level of details, concepts and the fact that this book continues to focus on mastering the core platform that is Node.js before moving into higher level concepts on top of the platform.I will also note that this Packt title is written damn well and flows properly which is a requirement for my expectations at this point.
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Arthur Jose Germano Apr 09, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This is a great book, full of what I think is the edge of Node coding and way of think.The only two things that is not great is this book are:- First: It doesn't go all the way with examples. I had to download the code. But I think when you are following a way of thinking it's best to show you all the way, not just part of it. Because if I am lost I can turn back and start over. Which was not possible in several examples.- Second: The use of paid examples. I don't have accounts in amazon, twillio, or digital ocean, which makes the examples provided hard to follow. As I said previosly in the first point, I would prefer to follow it all through.But that is just my opinion. Besides that, I recommend it very much. Very rich and the autor show his incredible mastery of Node.If you want to improve your knowlodge in Node... go for it buying it !
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gzelenak36 Dec 16, 2019
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I liked topic about modules it gave me plus info though other JS articles describe the theme very well.I found this book very useful.
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Profile icon Sandro Pasquali
Sandro Pasquali
Sandro Pasquali formed a technology company named Simple in 1997, that sold the world's first JavaScript-based application development framework and was awarded several patents for deployment and advertising technologies that anticipated the future of Internet-based software. Node represents, for him, the natural next step in the inexorable march towards the day when JavaScript powers nearly every level of software development. Sandro has led the design of enterprise-grade applications for some of the largest companies in the world, including Nintendo, Major League Baseball, Bang and Olufsen, LimeWire, AppNexus, Conde Nast, and others. He has displayed interactive media exhibits during the Venice Biennial, won design awards, built knowledge management tools for research institutes and schools, and started and run several start-ups. Always seeking new ways to blend design excellence and technical innovation, he has made significant contributions across all levels of software architecture, from data management and storage tools to innovative user interfaces and frameworks. He is the author of Deploying Node.js, also by Packt Publishing, which aims to help developers get their work in front of others. Sandro runs a software development company in New York and trains corporate development teams interested in using Node and JavaScript to improve their products. He spends the rest of his time entertaining his beautiful daughter, and his wife.
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Profile icon Kevin Faaborg
Kevin Faaborg
Kevin Faaborg is a professional software developer and avid software hobbyist. At Harvard, he learned C programming from visiting professor Brian Kernighan. He witnessed and contributed to how digital technology has shaped music distribution, working first at MTV Networks, then Lime Wire LLC, and now Spotify AB, where he designed and started the patent program. Kevin travels frequently, spending time each year in San Francisco, Colorado, NYC, and Stockholm. Follow him at github/zootella
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Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact [email protected] with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at [email protected] using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on [email protected] with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on [email protected] within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on [email protected] who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on [email protected] within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela