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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

Product Details

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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 : 9781788291088
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 : 9781788291088
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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Nguyen Duc Hoang Feb 21, 2018
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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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VIKAS KUMAR MISHRA Jan 17, 2018
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Nice Book for a beginner like me.Everything was clearly explained and micro-services topic is very helpful to me.
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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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