Book Image

.Go Programming Blueprints - Second Edition

By : Mat Ryer
Book Image

.Go Programming Blueprints - Second Edition

By: Mat Ryer

Overview of this book

Go is the language of the Internet age, and the latest version of Go comes with major architectural changes. Implementation of the language, runtime, and libraries has changed significantly. The compiler and runtime are now written entirely in Go. The garbage collector is now concurrent and provides dramatically lower pause times by running in parallel with other Go routines when possible. This book will show you how to leverage all the latest features and much more. This book shows you how to build powerful systems and drops you into real-world situations. You will learn to develop high quality command-line tools that utilize the powerful shell capabilities and perform well using Go's in-built concurrency mechanisms. Scale, performance, and high availability lie at the heart of our projects, and the lessons learned throughout this book will arm you with everything you need to build world-class solutions. You will get a feel for app deployment using Docker and Google App Engine. Each project could form the basis of a start-up, which means they are directly applicable to modern software markets.
Table of Contents (13 chapters)

Transactions in Google Cloud Datastore


Transactions allow you to specify a series of changes to the data store and commit them as one. If any of the individual operations fails, the whole transaction will not be applied. This is extremely useful if you want to maintain counters or have multiple entities that depend on each other's state. During a transaction in Google Cloud Datastore, all entities that are read are locked (other code is prevented from making changes) until the transaction is complete, providing an additional sense of security and preventing data races.

Note

If you were building a bank (it seems crazy, but the guys at Monzo in London are indeed building a bank using Go), you might represent user accounts as an entity called Account. To transfer money from one account to another, you'd need to make sure the money was deducted from account A and deposited into account B as a single transaction. If either fails, people aren't going to be happy (to be fair, if the deduction operation...