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redis_session.go
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redis_session.go
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// Copyright 2021 tree xie
//
// 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 cache
import (
"context"
"time"
"github.com/redis/go-redis/v9"
)
type RedisSession struct {
client redis.UniversalClient
prefix string
}
// NewRedisSession returns a new redis session
func NewRedisSession(c redis.UniversalClient) *RedisSession {
return &RedisSession{
client: c,
}
}
func (rs *RedisSession) getKey(key string) (string, error) {
if key == "" {
return "", ErrKeyIsNil
}
return rs.prefix + key, nil
}
// SetPrefix sets prefix for redis session's key
func (rs *RedisSession) SetPrefix(prefix string) {
rs.prefix = prefix
}
// Get session from redis, it will not return error if data is not exists
func (rs *RedisSession) Get(ctx context.Context, key string) ([]byte, error) {
key, err := rs.getKey(key)
if err != nil {
return nil, err
}
result, err := rs.client.Get(ctx, key).Bytes()
// 如果查询失败,返回空,redis session针对获取不到的不需要直接返回出错
if err == redis.Nil {
err = nil
}
return result, err
}
// Set session to redis
func (rs *RedisSession) Set(ctx context.Context, key string, data []byte, ttl time.Duration) error {
key, err := rs.getKey(key)
if err != nil {
return err
}
return rs.client.Set(ctx, key, data, ttl).Err()
}
// Destroy session from redis
func (rs *RedisSession) Destroy(ctx context.Context, key string) error {
key, err := rs.getKey(key)
if err != nil {
return err
}
return rs.client.Del(ctx, key).Err()
}