Add redis keyvalue storage implementation

Signed-off-by: kolaente <k@knt.li>

pkg/db/db.go

@@ -90,7 +90,7 @@ func CreateDBEngine() (engine *xorm.Engine, err error) {
 			cacher := caches.NewLRUCacher(caches.NewMemoryStore(), config.CacheMaxElementSize.GetInt())
 			engine.SetDefaultCacher(cacher)
 		case "redis":
-			cacher := xrc.NewRedisCacher(config.RedisEnabled.GetString(), config.RedisPassword.GetString(), xrc.DEFAULT_EXPIRATION, engine.Logger())
+			cacher := xrc.NewRedisCacher(config.RedisHost.GetString(), config.RedisPassword.GetString(), xrc.DEFAULT_EXPIRATION, engine.Logger())
 			engine.SetDefaultCacher(cacher)
 		default:
 			log.Info("Did not find a valid cache type. Caching disabled. Please refer to the docs for poosible cache types.")

pkg/modules/keyvalue/redis/redis.go

@@ -0,0 +1,64 @@
+// Copyright 2020 Vikunja and contriubtors. All rights reserved.
+//
+// This file is part of Vikunja.
+//
+// Vikunja is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Vikunja is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Vikunja.  If not, see <https://www.gnu.org/licenses/>.
+
+package redis
+
+import (
+	"code.vikunja.io/api/pkg/red"
+	"encoding/json"
+	"github.com/go-redis/redis/v7"
+)
+
+// Storage is a redis implementation of a keyvalue storage
+type Storage struct {
+	client *redis.Client
+}
+
+// NewStorage creates a new redis key value storage
+func NewStorage() *Storage {
+	red.InitRedis()
+
+	return &Storage{
+		client: red.GetRedis(),
+	}
+}
+
+// Put puts a value into redis
+func (s *Storage) Put(key string, value interface{}) (err error) {
+	v, err := json.Marshal(value)
+	if err != nil {
+		return err
+	}
+
+	return s.client.Set(key, v, 0).Err()
+}
+
+// Get retrieves a saved value from redis
+func (s *Storage) Get(key string) (value interface{}, err error) {
+	b, err := s.client.Get(key).Bytes()
+	if err != nil {
+		return nil, err
+	}
+
+	err = json.Unmarshal(b, value)
+	return
+}
+
+// Del removed a value from redis
+func (s *Storage) Del(key string) (err error) {
+	return s.client.Del(key).Err()
+}

pkg/red/redis.go

@@ -26,6 +26,10 @@ var r *redis.Client
 
 // InitRedis initializes a redis connection
 func InitRedis() {
+	if r != nil {
+		return
+	}
+
 	if !config.RedisEnabled.GetBool() {
 		return
 	}