example_binary_marshal_unmarshal_redis.go

package main

import (
	"encoding/json"
	"fmt"
	"time"

	redis "gopkg.in/redis.v6"
)

type Author struct {
	FirstName string
	LastName  string
	Email     string
}

type Example struct {
	Id          int64
	Title       string
	Slug        string
	DateCreated time.Time
	DateUpdated time.Time
	Authors     []Author
}

// MarshalBinary -
func (e *Example) MarshalBinary() ([]byte, error) {
	return json.Marshal(e)
}

// UnmarshalBinary -
func (e *Example) UnmarshalBinary(data []byte) error {
	if err := json.Unmarshal(data, &e); err != nil {
		return err
	}

	return nil
}

func main() {
	cache := redis.NewClient(&redis.Options{
		Addr:     "",
		Password: "",
		DB:       0,
	})

	if _, err := cache.Ping().Result(); err != nil {
		fmt.Errorf("Could not ping redis server due to err: %s \n", err)
		return
	}

	example := Example{
		Id:          12345,
		Title:       "Example Title",
		Slug:        "Example Slug",
		DateCreated: time.Now().UTC(),
		Authors: []Author{
			Author{
				FirstName: "Nevio",
				LastName:  "Vesic",
				Email:     "[email protected]",
			},
		},
	}

	cacheKey := "some.cache.key"
	cacheField := "some-field-like-account-id"

	if err := cache.HSet(cacheKey, cacheField, example).Err(); err != nil {
		fmt.Printf("Unable to store example struct into redis due to: %s \n", err)
		return
	}

	cacheData, cacheErr := cache.HGet(cacheKey, cacheField).Result()
	if cacheErr != nil {
		fmt.Printf("Unable to retrieve example struct from redis due to: %s \n", cacheErr)
		return
	}

	var newExample Example

	if err := newExample.UnmarshalBinary([]byte(cacheData)); err != nil {
		fmt.Printf("Unable to unmarshal data into the new example struct due to: %s \n", err)
		return
	}

	fmt.Printf("Example.UnmarshalBinary: %+v \n", newExample)
}