Add redis for caching, first try during a train ride so expect it to not be working yet

server/cache/interface.go

@@ -4,7 +4,7 @@ import "time"
 
 // ICache is an interface that defines how the pages server interacts with the cache.
 type ICache interface {
-	Set(key string, value interface{}, ttl time.Duration) error
-	Get(key string) (interface{}, bool)
+	Set(key string, value string, ttl time.Duration) error
+	Get(key string) (string, bool)
 	Remove(key string)
 }

server/cache/memory.go

@@ -1,7 +1,31 @@
 package cache
 
-import "github.com/OrlovEvgeny/go-mcache"
+import (
+	"github.com/OrlovEvgeny/go-mcache"
+	"time"
+)
+
+type MCache struct {
+	mcache *mcache.CacheDriver
+}
+
+func (m *MCache) Set(key string, value string, ttl time.Duration) error {
+	return m.mcache.Set(key, value, ttl)
+}
+
+func (m *MCache) Get(key string) (string, bool) {
+	val, ok := m.mcache.Get(key)
+	if ok {
+		return val.(string), true
+	} else {
+		return "", false
+	}
+}
+
+func (m *MCache) Remove(key string) {
+	m.mcache.Remove(key)
+}
 
 func NewInMemoryCache() ICache {
-	return mcache.New()
+	return &MCache{mcache.New()}
 }

server/cache/redis.go

@@ -0,0 +1,47 @@
+package cache
+
+import (
+	"context"
+	"github.com/redis/go-redis/v9"
+	"github.com/rs/zerolog/log"
+	"time"
+)
+
+type RedisCache struct {
+	ctx context.Context
+	rdb *redis.Client
+}
+
+func (r *RedisCache) Set(key string, value string, ttl time.Duration) error {
+	return r.rdb.Set(r.ctx, key, value, ttl).Err()
+}
+
+func (r *RedisCache) Get(key string) (string, bool) {
+	val, err := r.rdb.Get(r.ctx, key).Result()
+	if err != nil {
+		if err == redis.Nil {
+			log.Error().Err(err).Str("key", key).Msg("Couldn't request key from cache.")
+		}
+		return "", false
+	} else {
+		return val, true
+	}
+}
+
+func (r *RedisCache) Remove(key string) {
+	err := r.rdb.Del(r.ctx, key).Err()
+	if err == nil {
+		log.Error().Err(err).Str("key", key).Msg("Couldn't delete key from cache.")
+	}
+}
+
+func NewRedisCache() ICache {
+	return &RedisCache{
+		context.Background(),
+		redis.NewClient(&redis.Options{
+			Addr:     "localhost:6379",
+			Password: "", // no password set
+			DB:       0,  // use default DB
+		}),
+	}
+}