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database_redis.go
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/
database_redis.go
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// Copyright 2015 realglobe, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package session
import (
"encoding/json"
"time"
"github.com/garyburd/redigo/redis"
"github.com/realglobe-Inc/go-lib/erro"
)
const (
tagDate = "date"
)
type redisDb struct {
pool *redis.Pool
tag string
}
// redis によるセッションの格納庫。
func NewRedisDb(pool *redis.Pool, tag string) Db {
return &redisDb{
pool: pool,
tag: tag,
}
}
func (this *redisDb) Get(id string) (*Element, error) {
conn := this.pool.Get()
defer conn.Close()
data, err := redis.Bytes(conn.Do("GET", this.tag+id))
if err != nil {
if err == redis.ErrNil {
// 無かった。
return nil, nil
}
return nil, erro.Wrap(err)
}
var elem Element
if err := json.Unmarshal(data, &elem); err != nil {
return nil, erro.Wrap(err)
}
elem.setSaved()
return &elem, nil
}
func (this *redisDb) Save(elem *Element, exp time.Time) error {
conn := this.pool.Get()
defer conn.Close()
data, err := json.Marshal(elem)
if err != nil {
return erro.Wrap(err)
}
expIn := int64(exp.Sub(time.Now()) / time.Millisecond)
if _, err := conn.Do("SET", this.tag+elem.Id(), data, "PX", expIn); err != nil {
return erro.Wrap(err)
}
return nil
}