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Home > Web Development > Web Services > Building RESTful Web services with Go
Building RESTful Web services with Go
Building RESTful Web services with Go

Building RESTful Web services with Go: Learn how to build powerful RESTful APIs with Golang that scale gracefully

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Building RESTful Web services with Go

Handling Routing for Our REST Services

In this chapter, we will discuss routing of the application. For creating an API, the first step is to define routes. So, to define routes, we need to figure out available constructs in Go. We begin with the basic internal routing mechanism in Go. Then, we see how to create a custom Multiplexer. Since ServeMux's capabilities are very limited, we will explore a few other frameworks built to serve this purpose. This chapter also includes creating routes using third-party libraries such as httprouter and Gorilla Mux. We are going to build a URL-shortening API throughout this book. In this chapter, we define routes for the API. Then, we discuss topics like SQL injection of an URL. A web framework allows the developer to create a route as the first step and then attach handlers to it. Those handlers hold the business logic of the application...

Getting the code

Understanding Go's net/http package

Go's net/http package deals with HTTP client and server implementations. Here, we are mainly interested in the server implementation. Let us create a small Go program called basicHandler.go that defines the route and a function handler:

package main
import (
    "io"
    "net/http"
    "log"
)
// hello world, the web server
func MyServer(w http.ResponseWriter, req *http.Request) {
    io.WriteString(w, "hello, world!\n")
}
func main() {
    http.HandleFunc("/hello", MyServer)
    log.Fatal(http.ListenAndServe(":8000", nil))
}

This code does the following things: 

  1. Create a route called  /hello. 
  2. Create a handler called MyServer.
  3. Whenever the request comes on the route (/hello), the handler function will be executed.
  4. Write hello, world to the response.
  5. Start the server...

ServeMux, a basic router in Go

ServeMux is an HTTP request multiplexer. The HandleFunc we used in the preceding section is actually a method of ServeMux. By creating a new ServeMux, we can handle multiple routes. Before that, we can also create our own multiplexer. A multiplexer just handles the logic of separating routes with a function called ServeHTTP. So if we create a new struct with the ServeHTTP method, it can do the job.

Consider a route as a key in a dictionary (map), then the handler as its value. The router finds the handler from the route and tries to execute the ServeHTTP function. Let us create a program called customMux.go and see this implementation in action:

package main
import (
    "fmt"
    "math/rand"
    "net/http"
)
// CustomServeMux is a struct which can be a multiplexer
type CustomServeMux struct {
}
// This is the function...

Introducing httprouter, a lightweight HTTP router

httprouter, as the name suggests, routes the HTTP requests to particular handlers. Compared to the basic router, it has the following features:

  • Allows variables in the route paths
  • It matches the REST methods (GET, POST, PUT, and so on)
  • No compromising on performance

We are going to discuss these qualities in more detail in the following section. Before that, there are a few noteworthy points that make httprouter an even better URL router:

  • httprouter plays well with the inbuilt http.Handler
  • httprouter explicitly says that a request can only match to one route or none
  • The router's design encourages building sensible, hierarchical RESTful APIs
  •  You can build efficient static file servers

Installation

...

Introducing Gorilla Mux, a powerful HTTP router

Mux stands for the multiplexer. Similarly, Gorilla Mux is a multiplexer designed to multiplex HTTP routes (URLs) to different handlers. Handlers are the functions which can handle the given requests. Gorilla Mux is a wonderful package for writing beautiful routes for our web applications and API servers.

Gorilla Mux provides tons of options to control how routing is done to your web application. It allows a lot of features. Some of them are:

  • Path-based matching
  • Query-based matching
  • Domain-based matching
  • Sub-domain based matching
  • Reverse URL generation

Installation

Installing the Mux package is fairly simple. You need to run this command in the Terminal (Mac and Linux)...

Getting the code

You can download the code for this chapter from  https://github.com/narenaryan/gorestful/tree/master/chapter2. Feel free to add the comments and pull requests. Clone the code and use the code samples in the chapter2 directory.

Understanding Go's net/http package

Go's net/http package deals with HTTP client and server implementations. Here, we are mainly interested in the server implementation. Let us create a small Go program called basicHandler.go that defines the route and a function handler:

package main
import (
    "io"
    "net/http"
    "log"
)
// hello world, the web server
func MyServer(w http.ResponseWriter, req *http.Request) {
    io.WriteString(w, "hello, world!\n")
}
func main() {
    http.HandleFunc("/hello", MyServer)
    log.Fatal(http.ListenAndServe(":8000", nil))
}

This code does the following things: 

  1. Create a route called  /hello. 
  2. Create a handler called MyServer.
  3. Whenever the request comes on the route (/hello), the handler function will be executed.
  4. Write hello, world to the response.
  5. Start the server on port 8000. ListenAndServe returns error if something goes wrong. So log it using log.Fatal.
  6. The http package has a function called HandleFunc, using which we can map an URL to a function.
  1. Here,...
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Key benefits

  • Follow best practices and explore techniques such as clustering and caching to achieve a reactive, scalable web service
  • Leverage the Gin Framework to quickly implement RESTful endpoints
  • Learn to implement a client library for a RESTful web service using Go

Description

REST is an architectural style that tackles the challenges of building scalable web services and in today's connected world, APIs have taken a central role on the web. APIs provide the fabric through which systems interact, and REST has become synonymous with APIs. The depth, breadth, and ease of use of Go, makes it a breeze for developers to work with it to build robust Web APIs. This book takes you through the design of RESTful web services and leverages a framework like Gin to implement these services. The book starts with a brief introduction to REST API development and how it transformed the modern web. You will learn how to handle routing and authentication of web services along with working with middleware for internal service. The book explains how to use Go frameworks to build RESTful web services and work with MongoDB to create REST API. You will learn how to integrate Postgres SQL and JSON with a Go web service and build a client library in Go for consuming REST API. You will learn how to scale APIs using the microservice architecture and deploy the REST APIs using Nginx as a proxy server. Finally you will learn how to metricize a REST API using an API Gateway. By the end of the book you will be proficient in building RESTful APIs in Go.

Who is this book for?

This book is intended for those who want to learn to build RESTful web services with a framework like Gin. To make best use of the code samples included in the book, you should have a basic knowledge of Go programming.

What you will learn

  • Create HTTP handler and introspect the Gorilla Mux router
  • OAuth 2 implementation with Go
  • Build RESTFul API with Gin Framework
  • Create REST API with MongoDB and Go
  • Build a working client library and unit test for REST API
  • Debug, test, and profile RESTful APIs with each of the frameworks
  • Optimize and scale REST API using microservices
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Dec 28, 2017
Length: 316 pages
Edition : 1st
Language : English
ISBN-13 : 9781788294287
Category :
Web Development
Languages :
Go
Concepts :
Web Services
Tools :
Buffalo

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Product Details

Publication date : Dec 28, 2017
Length: 316 pages
Edition : 1st
Language : English
ISBN-13 : 9781788294287
Category :
Web Development
Languages :
Go
Concepts :
Web Services
Tools :
Buffalo

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Table of Contents

12 Chapters
Getting Started with REST API Development Chevron down icon Chevron up icon
Getting Started with REST API Development
Types of web services
REST verbs and status codes
Rise of REST API with Single Page Applications
Setting up the project and running the development server
Building our first service – finding the Roman numeral
Using Gulp for creating auto code compiling and server reloading
Summary
Handling Routing for Our REST Services Chevron down icon Chevron up icon
Handling Routing for Our REST Services
Getting the code
Understanding Go's net/http package
ServeMux, a basic router in Go
Introducing httprouter, a lightweight HTTP router
Introducing Gorilla Mux, a powerful HTTP router
Creating a basic API layout for URL shortening services
Summary
Working with Middleware and RPC Chevron down icon Chevron up icon
Working with Middleware and RPC
Getting the code
What is middleware?
Multiple middleware and chaining
Painless middleware chaining with Alice
Using Gorilla's Handlers middleware for Logging
What is RPC?
JSON RPC using Gorilla RPC
Summary
Simplifying RESTful Services with Popular Go Frameworks Chevron down icon Chevron up icon
Simplifying RESTful Services with Popular Go Frameworks
Getting the code
go-restful, a framework for REST API creation
CRUD operations and SQLite3 basics
Building a Metro Rail API with go-restful
Building RESTful APIs with the Gin framework
Building a RESTful API with Revel.go
Summary
Working with MongoDB and Go to Create REST APIs Chevron down icon Chevron up icon
Working with MongoDB and Go to Create REST APIs
Getting the code
Introduction to MongoDB
Installing MongoDB and using the shell
Introducing mgo, a MongoDB driver for Go
RESTful API with Gorilla Mux and MongoDB
Boosting the querying performance with indexing
Designing an e-commerce data document model
Summary
Working with Protocol Buffers and GRPC Chevron down icon Chevron up icon
Working with Protocol Buffers and GRPC
Getting the code
Introduction to protocol buffers
Protocol buffer language
Compiling a protocol buffer with protoc
Introduction to GRPC
Bidirectional streaming with GRPC
Summary
Working with PostgreSQL, JSON, and Go Chevron down icon Chevron up icon
Working with PostgreSQL, JSON, and Go
Getting the code
Installing the PostgreSQL database
pq, a pure PostgreSQL database driver for Go
Implementing a URL shortening service using Postgres and pq
Exploring the JSON store in PostgreSQL
Summary
Building a REST API Client in Go and Unit Testing Chevron down icon Chevron up icon
Building a REST API Client in Go and Unit Testing
Getting the code
Plan for building a REST API client
Basics for writing a command-line tool in Go
grequests – a REST API package for Go
Getting comfortable with the GitHub REST API
Creating a CLI tool as an API client for the GitHub REST API
Using Redis for caching the API data
Creating a unit testing tool for our URL shortening service
Summary
Scaling Our REST API Using Microservices Chevron down icon Chevron up icon
Scaling Our REST API Using Microservices
Getting the code
What are microservices?
Monolith versus microservices
Go Kit, a package for building microservices
Summary
Deploying Our REST services Chevron down icon Chevron up icon
Deploying Our REST services
Getting the code
Installing and configuring Nginx
Monitoring our Go API server with Supervisord
Summary
Using an API Gateway to Monitor and Metricize REST API Chevron down icon Chevron up icon
Using an API Gateway to Monitor and Metricize REST API
Getting the code
Why is an API gateway required?
Kong, an open-source API gateway
Adding API to Kong
API logging in Kong
API authentication in Kong
API rate limiting in Kong
Kong CLI
Other API gateways
Summary
Handling Authentication for Our REST Services Chevron down icon Chevron up icon
Handling Authentication for Our REST Services
Getting the code
How authentication works
Introducing Postman, a tool for testing REST API
Persisting client sessions with Redis
Introduction to JSON Web Tokens (JWT) and OAuth2
OAuth 2 architecture and basics
Summary

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Franc Hauselmann Dec 29, 2017
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Easy to read, straight to the point, a lot of content with source code, great tips! Thanks to the author!
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Good book :)
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Covers a broad range of topics
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Probably shouldn’t be your first intro to go, but very good otherwise. If you know go or are relatively comfortable with web development in any other languages you should be fine.
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About the author

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Yellavula
Naren Yellavula, known in the developer community as Naren Arya, started his programming career in a somewhat surprising manner. He ditched mechanical engineering in favor of computer science after watching The Matrix for the first time. With domain expertise in cloud telephony and e-commerce, Naren has a total of 6 years' professional experience and 10 years of programming experience. His articles on open source have been read over a million times worldwide. Naren has spoken at the PyCon India conference on two occasions. He currently works as a software engineer, building microservices for Tradebyte Software GmbH (a Zalando enterprise). In his spare time, he travels to new places. He also loves reading – nonfiction most of the time, and Victorian and Russian fiction on occasion.
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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 customercare@packt.com 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 customercare@packt.com 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 customercare@packt.com 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 customercare@packt.com 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 customercare@packt.com 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 customercare@packt.com 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