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package session
import (
"net/http"
"sync"
"github.com/astaxie/beego/session"
"github.com/siddontang/ledisdb/config"
"github.com/siddontang/ledisdb/ledis"
)
var ledispder = &LedisProvider{}
var c *ledis.DB
// ledis session store
type LedisSessionStore struct {
sid string
lock sync.RWMutex
values map[interface{}]interface{}
maxlifetime int64
}
// set value in ledis session
func (ls *LedisSessionStore) Set(key, value interface{}) error {
ls.lock.Lock()
defer ls.lock.Unlock()
ls.values[key] = value
return nil
}
// get value in ledis session
func (ls *LedisSessionStore) Get(key interface{}) interface{} {
ls.lock.RLock()
defer ls.lock.RUnlock()
if v, ok := ls.values[key]; ok {
return v
} else {
return nil
}
}
// delete value in ledis session
func (ls *LedisSessionStore) Delete(key interface{}) error {
ls.lock.Lock()
defer ls.lock.Unlock()
delete(ls.values, key)
return nil
}
// clear all values in ledis session
func (ls *LedisSessionStore) Flush() error {
ls.lock.Lock()
defer ls.lock.Unlock()
ls.values = make(map[interface{}]interface{})
return nil
}
// get ledis session id
func (ls *LedisSessionStore) SessionID() string {
return ls.sid
}
// save session values to ledis
func (ls *LedisSessionStore) SessionRelease(w http.ResponseWriter) {
b, err := session.EncodeGob(ls.values)
if err != nil {
return
}
c.Set([]byte(ls.sid), b)
c.Expire([]byte(ls.sid), ls.maxlifetime)
}
// ledis session provider
type LedisProvider struct {
maxlifetime int64
savePath string
}
// init ledis session
// savepath like ledis server saveDataPath,pool size
// e.g. 127.0.0.1:6379,100,astaxie
func (lp *LedisProvider) SessionInit(maxlifetime int64, savePath string) error {
lp.maxlifetime = maxlifetime
lp.savePath = savePath
cfg := new(config.Config)
cfg.DataDir = lp.savePath
var err error
nowLedis, err := ledis.Open(cfg)
c, err = nowLedis.Select(0)
if err != nil {
println(err)
return nil
}
return nil
}
// read ledis session by sid
func (lp *LedisProvider) SessionRead(sid string) (session.SessionStore, error) {
kvs, err := c.Get([]byte(sid))
var kv map[interface{}]interface{}
if len(kvs) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(kvs)
if err != nil {
return nil, err
}
}
ls := &LedisSessionStore{sid: sid, values: kv, maxlifetime: lp.maxlifetime}
return ls, nil
}
// check ledis session exist by sid
func (lp *LedisProvider) SessionExist(sid string) bool {
count, _ := c.Exists([]byte(sid))
if count == 0 {
return false
} else {
return true
}
}
// generate new sid for ledis session
func (lp *LedisProvider) SessionRegenerate(oldsid, sid string) (session.SessionStore, error) {
count, _ := c.Exists([]byte(sid))
if count == 0 {
// oldsid doesn't exists, set the new sid directly
// ignore error here, since if it return error
// the existed value will be 0
c.Set([]byte(sid), []byte(""))
c.Expire([]byte(sid), lp.maxlifetime)
} else {
data, _ := c.Get([]byte(oldsid))
c.Set([]byte(sid), data)
c.Expire([]byte(sid), lp.maxlifetime)
}
kvs, err := c.Get([]byte(sid))
var kv map[interface{}]interface{}
if len(kvs) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob([]byte(kvs))
if err != nil {
return nil, err
}
}
ls := &LedisSessionStore{sid: sid, values: kv, maxlifetime: lp.maxlifetime}
return ls, nil
}
// delete ledis session by id
func (lp *LedisProvider) SessionDestroy(sid string) error {
c.Del([]byte(sid))
return nil
}
// Impelment method, no used.
func (lp *LedisProvider) SessionGC() {
return
}
// @todo
func (lp *LedisProvider) SessionAll() int {
return 0
}
func init() {
session.Register("ledis", ledispder)
}
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