Multi Cache Adapter implementation

A CacheAdapter implementation that allows to connect and use multiple adapters at the same time.

Features

• Allows the creation of fallback cache logics, allowing to reach different cache types if one of them is failing for any reason
• Allows, optionally, to track partial failures as warnings, so you can log them using your preferred method

Usage

Since MultiCacheAdapter and MultiCacheSessionAdapter implement the respective interfaces (CacheAdapter and CacheSessionAdapter) you have all the methods at your disposal.

Please refer to the following example for the correct usage:

package main

import (
	"log"
	"time"

	"github.com/gomodule/redigo/redis"
	cacheadapters "github.com/tryvium-travels/golang-cache-adapters"
	rediscacheadapters "github.com/tryvium-travels/golang-cache-adapters/redis"
	multicacheadapters "github.com/tryvium-travels/golang-cache-adapters/multicache"
)

func main() {
	// Ideally you would want to use 2 DIFFERENT cache types
	// for the sake of the simplicity, we will just create 2
	// adapters of the same type.

	redisURI1 := "rediss://my-redis-instance-uri1:port"
	redisURI2 := "rediss://my-redis-instance-uri2:port"

	myRedisPool1 := &redis.Pool{
		Dial: func() (redis.Conn, error) {
			// obtain a redis connection, there
			// are plenty of ways to do that.
			return redis.DialURL(redisURI1)
		},
	}

	myRedisPool2 := &redis.Pool{
		Dial: func() (redis.Conn, error) {
			// obtain a redis connection, there
			// are plenty of ways to do that.
			return redis.DialURL(redisURI2)
		},
	}

	exampleTTL := time.Hour

	// first we create the adapters.
	redisAdapter1, err := rediscacheadapters.New(myRedisPool1, exampleTTL)
	if err != nil {
		// remember to check for errors
		log.Fatalf("Redis Adapter 1 initialization error: %s", err)
	}

	redisAdapter2, err := rediscacheadapters.New(myRedisPool1, exampleTTL)
	if err != nil {
		// remember to check for errors
		log.Fatalf("Redis Adapter 2 initialization error: %s", err)
	}

	// then we create a MultiCacheAdapter to use them at the same time.
	adapter, err := multicacheadapters.New(redisAdapter1, redisAdapter2)
	if err != nil {
		// remember to check for errors
		log.Fatalf("Multi Cache Adapter 2 initialization error: %s", err)
	}

	type exampleStruct struct {
		Value string
	}

	exampleKey := "a:redis:key"

	var exampleValue exampleStruct
	err = adapter.Get(exampleKey, &exampleValue)
	if err != nil {
		// remember to check for errors
		log.Fatalf("adapter.Get error: %s", err)
	}

	exampleKey = "another:redis:key"

	// nil TTL represents the default value put in the New function
	err = adapter.Set(exampleKey, exampleValue, nil)
	if err != nil {
		// remember to check for errors
		log.Fatalf("adapter.Get error: %s", err)
	}
}