vikunja-api/pkg/modules/keyvalue/redis/redis.go

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// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public Licensee as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
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// This program 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
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// GNU Affero General Public Licensee for more details.
//
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// You should have received a copy of the GNU Affero General Public Licensee
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
package redis
import (
"bytes"
"context"
"encoding/gob"
"errors"
"code.vikunja.io/api/pkg/red"
"github.com/go-redis/redis/v8"
)
// 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) {
var v interface{}
switch value.(type) {
case int:
v = value
case int8:
v = value
case int16:
v = value
case int32:
v = value
case int64:
v = value
default:
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
err = enc.Encode(value)
if err != nil {
return err
}
return s.client.Set(context.Background(), key, buf.Bytes(), 0).Err()
}
return s.client.Set(context.Background(), key, v, 0).Err()
}
// Get retrieves a saved value from redis
func (s *Storage) Get(key string) (value interface{}, exists bool, err error) {
value, err = s.client.Get(context.Background(), key).Result()
if err != nil && errors.Is(err, redis.Nil) {
return nil, false, nil
}
return value, true, err
}
func (s *Storage) GetWithValue(key string, value interface{}) (exists bool, err error) {
b, err := s.client.Get(context.Background(), key).Bytes()
if err != nil {
if errors.Is(err, redis.Nil) {
return false, nil
}
return
}
var buf bytes.Buffer
_, err = buf.Write(b)
if err != nil {
return
}
dec := gob.NewDecoder(&buf)
err = dec.Decode(value)
return true, err
}
// Del removed a value from redis
func (s *Storage) Del(key string) (err error) {
return s.client.Del(context.Background(), key).Err()
}
// IncrBy increases the value saved at key by the amount provided through update
func (s *Storage) IncrBy(key string, update int64) (err error) {
return s.client.IncrBy(context.Background(), key, update).Err()
}
// DecrBy decreases the value saved at key by the amount provided through update
func (s *Storage) DecrBy(key string, update int64) (err error) {
return s.client.DecrBy(context.Background(), key, update).Err()
}