Book Image

Network Automation with Go

By : Nicolas Leiva, Michael Kashin
Book Image

Network Automation with Go

By: Nicolas Leiva, Michael Kashin

Overview of this book

Go’s built-in first-class concurrency mechanisms make it an ideal choice for long-lived low-bandwidth I/O operations, which are typical requirements of network automation and network operations applications. This book provides a quick overview of Go and hands-on examples within it to help you become proficient with Go for network automation. It’s a practical guide that will teach you how to automate common network operations and build systems using Go. The first part takes you through a general overview, use cases, strengths, and inherent weaknesses of Go to prepare you for a deeper dive into network automation, which is heavily reliant on understanding this programming language. You’ll explore the common network automation areas and challenges, what language features you can use in each of those areas, and the common software tools and packages. To help deepen your understanding, you’ll also work through real-world network automation problems and apply hands-on solutions to them. By the end of this book, you’ll be well-versed with Go and have a solid grasp on network automation.
Table of Contents (18 chapters)
1
Part 1: The Go Programming Language
6
Part 2: Common Tools and Frameworks
10
Part 3: Interacting with APIs

Transport Layer

Transport layer protocols are the next OSI layer on top of IP and offer a communication channel abstraction. The two most common protocols today are TCP, which offers a connection-oriented communication channel, and UDP, a connectionless protocol.

In Go, the way you interact with both protocols is similar, even though the underlying packet exchange may be completely different. At a high level, there are only a few things that you need to keep in mind when dealing with TCP or UDP:

  • Each TCP or UDP application works with a corresponding connection represented by a concrete TCPConn or UDPConn type, respectively.
  • Go has other connection types with overlapping features like PacketConn that deals with connectionless protocols (UDP, IP), Conn that covers IP, TCP and UDP, and UnixConn for connections to Unix domain sockets. We only focus on TCPConn and UDPConn in this section.
  • Clients use net.DialTCP and net.DialUDP to open a socket to a remote address.
  • Servers use net.ListenUDP...