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sess_memcache.go
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sess_memcache.go
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// Beego (http://beego.me/)
// @description beego is an open-source, high-performance web framework for the Go programming language.
// @link http://github.com/astaxie/beego for the canonical source repository
// @license http://github.com/astaxie/beego/blob/master/LICENSE
// @authors astaxie
package session
import (
"net/http"
"sync"
"github.com/astaxie/beego/session"
"github.com/beego/memcache"
)
var mempder = &MemProvider{}
// memcache session store
type MemcacheSessionStore struct {
c *memcache.Connection
sid string
lock sync.RWMutex
values map[interface{}]interface{}
maxlifetime int64
}
// set value in memcache session
func (rs *MemcacheSessionStore) Set(key, value interface{}) error {
rs.lock.Lock()
defer rs.lock.Unlock()
rs.values[key] = value
return nil
}
// get value in memcache session
func (rs *MemcacheSessionStore) Get(key interface{}) interface{} {
rs.lock.RLock()
defer rs.lock.RUnlock()
if v, ok := rs.values[key]; ok {
return v
} else {
return nil
}
}
// delete value in memcache session
func (rs *MemcacheSessionStore) Delete(key interface{}) error {
rs.lock.Lock()
defer rs.lock.Unlock()
delete(rs.values, key)
return nil
}
// clear all values in memcache session
func (rs *MemcacheSessionStore) Flush() error {
rs.lock.Lock()
defer rs.lock.Unlock()
rs.values = make(map[interface{}]interface{})
return nil
}
// get redis session id
func (rs *MemcacheSessionStore) SessionID() string {
return rs.sid
}
// save session values to redis
func (rs *MemcacheSessionStore) SessionRelease(w http.ResponseWriter) {
defer rs.c.Close()
// if rs.values is empty, return directly
if len(rs.values) < 1 {
rs.c.Delete(rs.sid)
return
}
b, err := session.EncodeGob(rs.values)
if err != nil {
return
}
rs.c.Set(rs.sid, 0, uint64(rs.maxlifetime), b)
}
// redis session provider
type MemProvider struct {
maxlifetime int64
savePath string
poolsize int
password string
}
// init redis session
// savepath like
// e.g. 127.0.0.1:9090
func (rp *MemProvider) SessionInit(maxlifetime int64, savePath string) error {
rp.maxlifetime = maxlifetime
rp.savePath = savePath
return nil
}
// read redis session by sid
func (rp *MemProvider) SessionRead(sid string) (session.SessionStore, error) {
conn, err := rp.connectInit()
if err != nil {
return nil, err
}
kvs, err := conn.Get(sid)
if err != nil {
return nil, err
}
var contain []byte
if len(kvs) > 0 {
contain = kvs[0].Value
}
var kv map[interface{}]interface{}
if len(contain) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(contain)
if err != nil {
return nil, err
}
}
rs := &MemcacheSessionStore{c: conn, sid: sid, values: kv, maxlifetime: rp.maxlifetime}
return rs, nil
}
// check redis session exist by sid
func (rp *MemProvider) SessionExist(sid string) bool {
conn, err := rp.connectInit()
if err != nil {
return false
}
defer conn.Close()
if kvs, err := conn.Get(sid); err != nil || len(kvs) == 0 {
return false
} else {
return true
}
}
// generate new sid for redis session
func (rp *MemProvider) SessionRegenerate(oldsid, sid string) (session.SessionStore, error) {
conn, err := rp.connectInit()
if err != nil {
return nil, err
}
var contain []byte
if kvs, err := conn.Get(sid); err != nil || len(kvs) == 0 {
// oldsid doesn't exists, set the new sid directly
// ignore error here, since if it return error
// the existed value will be 0
conn.Set(sid, 0, uint64(rp.maxlifetime), []byte(""))
} else {
conn.Delete(oldsid)
conn.Set(sid, 0, uint64(rp.maxlifetime), kvs[0].Value)
contain = kvs[0].Value
}
var kv map[interface{}]interface{}
if len(contain) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(contain)
if err != nil {
return nil, err
}
}
rs := &MemcacheSessionStore{c: conn, sid: sid, values: kv, maxlifetime: rp.maxlifetime}
return rs, nil
}
// delete redis session by id
func (rp *MemProvider) SessionDestroy(sid string) error {
conn, err := rp.connectInit()
if err != nil {
return err
}
defer conn.Close()
_, err = conn.Delete(sid)
if err != nil {
return err
}
return nil
}
// Impelment method, no used.
func (rp *MemProvider) SessionGC() {
return
}
// @todo
func (rp *MemProvider) SessionAll() int {
return 0
}
// connect to memcache and keep the connection.
func (rp *MemProvider) connectInit() (*memcache.Connection, error) {
c, err := memcache.Connect(rp.savePath)
if err != nil {
return nil, err
}
return c, nil
}
func init() {
session.Register("memcache", mempder)
}