[杂七杂八] cookie管理(2) session存储于内存

package memoryproviderimport (    "time")type SessionStore struct {    sid          string                      // unique session id    timeAccessed time.Time                   // last access time    infoColl     map[interface{}]interface{} // session value stored inside}func (st *SessionStore) Set(key, value interface{}) error {    st.infoColl[key] = value    providerInstance().SessionUpdate(st.sid)    return nil}func (st *SessionStore) Get(key interface{}) interface{} {    providerInstance().SessionUpdate(st.sid)    if v, ok := st.infoColl[key]; ok {        return v    } else {        return nil    }    return nil}func (st *SessionStore) Delete(key interface{}) error {    delete(st.infoColl, key)    providerInstance().SessionUpdate(st.sid)    return nil}func (st *SessionStore) SessionID() string {    return st.sid}