You're reading from Go Recipes for Developers Top techniques and practical solutions for real-life Go programming problems

Product type Paperback

Published in Dec 2024

Publisher Packt

ISBN-13 9781835464397

Length 350 pages

Edition 1st Edition

Languages

Tools

Go Cloud development kit

Concepts

Programming Language

Author (1):

Burak Serdar

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Table of Contents (20) Chapters

Preface

1. Chapter 1: Project Organization FREE CHAPTER

2. Chapter 2: Working with Strings

3. Chapter 3: Working with Date and Time

4. Chapter 4: Working with Arrays, Slices, and Maps

5. Chapter 5: Working with Types, Structs, and Interfaces

6. Chapter 6: Working with Generics

7. Chapter 7: Concurrency

8. Chapter 8: Errors and Panics

9. Chapter 9: The Context Package

10. Chapter 10: Working with Large Data

11. Chapter 11: Working with JSON

12. Chapter 12: Processes

13. Chapter 13: Network Programming

14. Chapter 14: Streaming Input/Output

15. Chapter 15: Databases

16. Chapter 16: Logging

17. Chapter 17: Testing, Benchmarking, and Profiling

18. Index

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Custom unmarshaling with two passes

The first pass unmarshals discriminator fields while leaving the rest of the input unprocessed. Based on the discriminator, the concrete instance of the object is constructed and unmarshaled.

How to do it...

We will work with an example Key structure in this section. The Key structure holds different types of cryptographic public keys, whose type is given in a Type field:

type KeyType string
const (
     KeyTypeRSA     = "rsa"
     KeyTypeED25519 = "ed25519"
)
type Key struct {
     Type KeyType          `json:"type"`
     Key  crypto.PublicKey `json:"key"`
}

Define the JSON tags for the data structure as usual. Most polymorphic structures can be marshaled without a custom marshaler because the runtime type of objects...