book

Go Programming Cookbook - Second Edition

Name: Go Programming Cookbook - Second Edition
Author: Aaron Torres
ISBN: 9781789800982

by Aaron Torres

July 2019

Intermediate to advanced

434 pages

8h 4m

English

Packt Publishing

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Title Page
Copyright and Credits
Go Programming Cookbook Second Edition
Dedication
About Packt
Why subscribe?
Contributors
About the authorAbout the reviewerPackt is searching for authors like you
Preface
Who this book is forWhat this book coversTo get the most out of this bookDownload the example code filesCode in ActionConventions usedSectionsGetting readyHow to do it…How it works…There's more…See alsoGet in touchReviews
I/O and Filesystems
Technical requirementsUsing the common I/O interfacesHow to do it...How it works...Using the bytes and strings packagesHow to do it...How it works...Working with directories and filesHow to do it...How it works...Working with the CSV formatHow to do it...How it works...Working with temporary filesHow to do it...How it works...Working with text/template and html/templateHow to do it...How it works...
Command-Line Tools
Technical requirementsUsing command-line flagsHow to do it...How it works...Using command-line argumentsHow to do it...How it works...Reading and setting environment variablesHow to do it...How it works...Configuration using TOML, YAML, and JSONHow to do it...How it works...Working with Unix pipesHow to do it...How it works...Catching and handling signalsHow to do it...How it works...An ANSI coloring applicationHow to do it...How it works...
Data Conversion and Composition
Technical requirementsConverting data types and interface castingHow to do it...How it works...Working with numeric data types using math and math/bigHow to do it...How it works...Currency conversions and float64 considerationsHow to do it...How it works...Using pointers and SQL NullTypes for encoding and decodingHow to do it...How it works...Encoding and decoding Go dataHow to do it...How it works...Structure tags and basic reflection in GoHow to do it...How it works...Implementing collections via closuresHow to do it...How it works...
Error Handling in Go
Technical requirementsHandling errors and the Error interfaceHow to do it...How it works...Using the pkg/errors package and wrapping errorsHow to do it...How it works...Using the log package and understanding when to log errorsHow to do it...How it works...Structured logging with the apex and logrus packagesHow to do it...How it works...Logging with the context packageHow to do it...How it works...Using package-level global variablesHow to do it...How it works...Catching panics for long-running processesHow to do it...How it works...

Network Programming
Technical requirementsWriting a TCP/IP echo server and clientHow to do it...How it works...Writing a UDP server and clientHow to do it...How it works...Working with domain name resolutionHow to do it...How it works...Working with WebSocketsHow to do it...How it works...Working with net/rpc for calling remote methodsHow to do it...How it works...Using net/mail for parsing emailsHow to do it...How it works...
All about Databases and Storage
Using the database/sql package with MySQLGetting readyHow to do it...How it works...Executing a database transaction interfaceGetting readyHow to do it...How it works...Connection pooling, rate limiting, and timeouts for SQLGetting readyHow to do it...How it works...Working with RedisGetting readyHow to do it...How it works...Using NoSQL with MongoDBGetting readyHow to do it...How it works...Creating storage interfaces for data portabilityGetting readyHow to do it...How it works...
Web Clients and APIs
Technical requirementsInitializing, storing, and passing http.Client structuresHow to do it...How it works...Writing a client for a REST APIHow to do it...How it works...Executing parallel and async client requestsHow to do it...How it works...Making use of OAuth2 clientsGetting readyHow to do it...How it works...Implementing an OAuth2 token storage interfaceGetting readyHow to do it...How it works...Wrapping a client in added functionality and function compositionHow to do it...How it works...Understanding GRPC clientsGetting readyHow to do it...How it works...Using twitchtv/twirp for RPCGetting readyHow to do it...How it works...
Microservices for Applications in Go
Technical requirementsWorking with web handlers, requests, and ResponseWriter instancesHow to do it...How it works...Using structures and closures for stateful handlersHow to do it...How it works...Validating input for Go structures and user inputsHow to do it...How it works...Rendering and content negotiationHow to do it...How it works...Implementing and using middlewareHow to do it...How it works...Building a reverse proxy applicationHow to do it...How it works...Exporting GRPC as a JSON APIGetting readyHow to do it...How it works...
Testing Go Code
Technical requirementsMocking using the standard libraryHow to do it...How it works...Using the Mockgen package to mock interfacesGetting readyHow to do it...How it works...Using table-driven tests to improve coverageHow to do it...How it works...Using third-party testing toolsGetting readyHow to do it...How it works...Behavior testing using GoGetting readyHow to do it...How it works...
Parallelism and Concurrency
Technical requirementsUsing channels and the select statementHow to do it...How it works...Performing async operations with sync.WaitGroupHow to do it...How it works...Using atomic operations and mutexHow to do it...How it works...Using the context packageHow to do it...How it works...Executing state management for channelsHow to do it...How it works...Using the worker pool design patternHow to do it...How it works...Using workers to create pipelinesHow to do it...How it works...
Distributed Systems
Technical requirementsUsing service discovery with ConsulHow to do it...How it works...Implementing basic consensus using RaftHow to do it...How it works...Using containerization with DockerGetting readyHow to do it...How it works...Orchestration and deployment strategiesHow to do it...How it works...Monitoring applicationsHow to do it...How it works...Collecting metricsGetting readyHow to do it...How it works...
Reactive Programming and Data Streams
Technical requirementsUsing Goflow for data flow programmingHow to do it...How it works...Using Kafka with SaramaGetting readyHow to do it...How it works...Using async producers with KafkaGetting readyHow to do it...How it works...Connecting Kafka to GoflowGetting readyHow to do it...How it works...Writing a GraphQL server in GoHow to do it...How it works...
Serverless Programming
Go programming on Lambda with ApexGetting readyHow to do it...How it works...Apex serverless logging and metricsGetting readyHow to do it...How it works...Google App Engine with GoGetting readyHow to do it...How it works...Working with Firebase using firebase.google.com/goGetting readyHow to do it...How it works...
Performance Improvements, Tips, and Tricks
Technical requirementsUsing the pprof toolHow to do it...How it works...Benchmarking and finding bottlenecksHow to do it...How it works...Memory allocation and heap managementHow to do it...How it works...Using fasthttprouter and fasthttpHow to do it...How it works...
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Content preview from Go Programming Cookbook - Second Edition

Error Handling in Go

Error handling is important for even the most basic Go program. Errors in Go implement the Error interface and must be dealt with at every layer of the code. Go errors do not work like exceptions, and unhandled errors can cause enormous problems. You should strive to handle and consider errors whenever they occur.

This chapter also covers logging since it's common to log whenever an actual error occurs. We'll also investigate wrapping errors, so that the given error should provide an additional context as it's returned up the function stack, so that it's easier to determine the actual cause of certain errors.

In this chapter, the following recipes will be covered:

Handling errors and the Error interface
Using the pkg/errors ...

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Go Programming Cookbook - Second Edition

by Aaron Torres

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.