112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
package memory
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import (
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"container/list"
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"github.com/astaxie/session"
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"sync"
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"time"
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)
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var pder = &Provider{list: list.New()}
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type SessionStore struct {
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sid string //session id唯一标示
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timeAccessed time.Time //最后访问时间
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value map[interface{}]interface{} //session里面存储的值
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}
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func (st *SessionStore) Set(key, value interface{}) error {
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st.value[key] = value
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pder.SessionUpdate(st.sid)
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return nil
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}
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func (st *SessionStore) Get(key interface{}) interface{} {
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pder.SessionUpdate(st.sid)
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if v, ok := st.value[key]; ok {
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return v
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} else {
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return nil
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}
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return nil
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}
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func (st *SessionStore) Delete(key interface{}) error {
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delete(st.value, key)
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pder.SessionUpdate(st.sid)
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return nil
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}
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func (st *SessionStore) SessionID() string {
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return st.sid
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}
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type Provider struct {
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lock sync.Mutex //用来锁
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sessions map[string]*list.Element //用来存储在内存
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list *list.List //用来做gc
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}
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func (pder *Provider) SessionInit(sid string) (session.Session, error) {
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pder.lock.Lock()
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defer pder.lock.Unlock()
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v := make(map[interface{}]interface{}, 0)
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newsess := &SessionStore{sid: sid, timeAccessed: time.Now(), value: v}
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element := pder.list.PushBack(newsess)
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pder.sessions[sid] = element
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return newsess, nil
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}
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func (pder *Provider) SessionRead(sid string) (session.Session, error) {
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if element, ok := pder.sessions[sid]; ok {
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return element.Value.(*SessionStore), nil
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} else {
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sess, err := pder.SessionInit(sid)
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return sess, err
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}
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return nil, nil
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}
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func (pder *Provider) SessionDestroy(sid string) error {
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if element, ok := pder.sessions[sid]; ok {
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delete(pder.sessions, sid)
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pder.list.Remove(element)
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return nil
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}
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return nil
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}
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func (pder *Provider) SessionGC(maxlifetime int64) {
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pder.lock.Lock()
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defer pder.lock.Unlock()
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for {
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element := pder.list.Back()
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if element == nil {
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break
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}
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if (element.Value.(*SessionStore).timeAccessed.Unix() + maxlifetime) < time.Now().Unix() {
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pder.list.Remove(element)
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delete(pder.sessions, element.Value.(*SessionStore).sid)
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} else {
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break
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}
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}
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}
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func (pder *Provider) SessionUpdate(sid string) error {
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pder.lock.Lock()
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defer pder.lock.Unlock()
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if element, ok := pder.sessions[sid]; ok {
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element.Value.(*SessionStore).timeAccessed = time.Now()
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pder.list.MoveToFront(element)
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return nil
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}
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return nil
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}
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func init() {
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pder.sessions = make(map[string]*list.Element, 0)
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session.Register("memory", pder)
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}
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