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redis.go
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redis.go
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// Copyright 2013 Beego Authors
// Copyright 2014 Unknwon
//
// 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 (
"fmt"
"strings"
"sync"
"time"
"github.com/Unknwon/com"
"gopkg.in/ini.v1"
"gopkg.in/redis.v2"
"github.com/macaron-contrib/session"
)
// RedisStore represents a redis session store implementation.
type RedisStore struct {
c *redis.Client
sid string
duration time.Duration
lock sync.RWMutex
data map[interface{}]interface{}
}
// NewRedisStore creates and returns a redis session store.
func NewRedisStore(c *redis.Client, sid string, dur time.Duration, kv map[interface{}]interface{}) *RedisStore {
return &RedisStore{
c: c,
sid: sid,
duration: dur,
data: kv,
}
}
// Set sets value to given key in session.
func (s *RedisStore) Set(key, val interface{}) error {
s.lock.Lock()
defer s.lock.Unlock()
s.data[key] = val
return nil
}
// Get gets value by given key in session.
func (s *RedisStore) Get(key interface{}) interface{} {
s.lock.RLock()
defer s.lock.RUnlock()
return s.data[key]
}
// Delete delete a key from session.
func (s *RedisStore) Delete(key interface{}) error {
s.lock.Lock()
defer s.lock.Unlock()
delete(s.data, key)
return nil
}
// ID returns current session ID.
func (s *RedisStore) ID() string {
return s.sid
}
// Release releases resource and save data to provider.
func (s *RedisStore) Release() error {
data, err := session.EncodeGob(s.data)
if err != nil {
return err
}
return s.c.SetEx(s.sid, s.duration, string(data)).Err()
}
// Flush deletes all session data.
func (s *RedisStore) Flush() error {
s.lock.Lock()
defer s.lock.Unlock()
s.data = make(map[interface{}]interface{})
return nil
}
// RedisProvider represents a redis session provider implementation.
type RedisProvider struct {
c *redis.Client
duration time.Duration
}
// Init initializes redis session provider.
// configs: network=tcp,addr=:6379,password=macaron,db=0,pool_size=100,idle_timeout=180
func (p *RedisProvider) Init(maxlifetime int64, configs string) (err error) {
p.duration, err = time.ParseDuration(fmt.Sprintf("%ds", maxlifetime))
if err != nil {
return err
}
cfg, err := ini.Load([]byte(strings.Replace(configs, ",", "\n", -1)))
if err != nil {
return err
}
opt := &redis.Options{
Network: "tcp",
}
for k, v := range cfg.Section("").KeysHash() {
switch k {
case "network":
opt.Network = v
case "addr":
opt.Addr = v
case "password":
opt.Password = v
case "db":
opt.DB = com.StrTo(v).MustInt64()
case "pool_size":
opt.PoolSize = com.StrTo(v).MustInt()
case "idle_timeout":
opt.IdleTimeout, err = time.ParseDuration(v + "s")
if err != nil {
return fmt.Errorf("error parsing idle timeout: %v", err)
}
default:
return fmt.Errorf("session/redis: unsupported option '%s'", k)
}
}
p.c = redis.NewClient(opt)
return p.c.Ping().Err()
}
// Read returns raw session store by session ID.
func (p *RedisProvider) Read(sid string) (session.RawStore, error) {
if !p.Exist(sid) {
if err := p.c.Set(sid, "").Err(); err != nil {
return nil, err
}
}
var kv map[interface{}]interface{}
kvs, err := p.c.Get(sid).Result()
if err != nil {
return nil, err
}
if len(kvs) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob([]byte(kvs))
if err != nil {
return nil, err
}
}
return NewRedisStore(p.c, sid, p.duration, kv), nil
}
// Exist returns true if session with given ID exists.
func (p *RedisProvider) Exist(sid string) bool {
has, err := p.c.Exists(sid).Result()
return err == nil && has
}
// Destory deletes a session by session ID.
func (p *RedisProvider) Destory(sid string) error {
return p.c.Del(sid).Err()
}
// Regenerate regenerates a session store from old session ID to new one.
func (p *RedisProvider) Regenerate(oldsid, sid string) (_ session.RawStore, err error) {
if p.Exist(sid) {
return nil, fmt.Errorf("new sid '%s' already exists", sid)
} else if !p.Exist(oldsid) {
// Make a fake old session.
if err = p.c.SetEx(oldsid, p.duration, "").Err(); err != nil {
return nil, err
}
}
if err = p.c.Rename(oldsid, sid).Err(); err != nil {
return nil, err
}
var kv map[interface{}]interface{}
kvs, err := p.c.Get(sid).Result()
if err != nil {
return nil, err
}
if len(kvs) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob([]byte(kvs))
if err != nil {
return nil, err
}
}
return NewRedisStore(p.c, sid, p.duration, kv), nil
}
// Count counts and returns number of sessions.
func (p *RedisProvider) Count() int {
return int(p.c.DbSize().Val())
}
// GC calls GC to clean expired sessions.
func (_ *RedisProvider) GC() {}
func init() {
session.Register("redis", &RedisProvider{})
}