mirror of
https://github.com/astaxie/beego.git
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192 lines
5.0 KiB
Go
192 lines
5.0 KiB
Go
// Beego (http://beego.me/)
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// @description beego is an open-source, high-performance web framework for the Go programming language.
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// @link http://github.com/astaxie/beego for the canonical source repository
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// @license http://github.com/astaxie/beego/blob/master/LICENSE
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// @authors astaxie
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package session
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import (
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"container/list"
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"net/http"
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"sync"
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"time"
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)
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var mempder = &MemProvider{list: list.New(), sessions: make(map[string]*list.Element)}
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// memory session store.
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// it saved sessions in a map in memory.
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type MemSessionStore struct {
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sid string //session id
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timeAccessed time.Time //last access time
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value map[interface{}]interface{} //session store
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lock sync.RWMutex
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}
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// set value to memory session
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func (st *MemSessionStore) Set(key, value interface{}) error {
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st.lock.Lock()
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defer st.lock.Unlock()
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st.value[key] = value
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return nil
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}
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// get value from memory session by key
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func (st *MemSessionStore) Get(key interface{}) interface{} {
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st.lock.RLock()
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defer st.lock.RUnlock()
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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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}
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// delete in memory session by key
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func (st *MemSessionStore) Delete(key interface{}) error {
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st.lock.Lock()
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defer st.lock.Unlock()
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delete(st.value, key)
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return nil
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}
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// clear all values in memory session
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func (st *MemSessionStore) Flush() error {
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st.lock.Lock()
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defer st.lock.Unlock()
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st.value = make(map[interface{}]interface{})
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return nil
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}
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// get this id of memory session store
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func (st *MemSessionStore) SessionID() string {
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return st.sid
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}
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// Implement method, no used.
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func (st *MemSessionStore) SessionRelease(w http.ResponseWriter) {
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}
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type MemProvider struct {
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lock sync.RWMutex // locker
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sessions map[string]*list.Element // map in memory
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list *list.List // for gc
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maxlifetime int64
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savePath string
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}
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// init memory session
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func (pder *MemProvider) SessionInit(maxlifetime int64, savePath string) error {
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pder.maxlifetime = maxlifetime
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pder.savePath = savePath
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return nil
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}
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// get memory session store by sid
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func (pder *MemProvider) SessionRead(sid string) (SessionStore, error) {
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pder.lock.RLock()
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if element, ok := pder.sessions[sid]; ok {
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go pder.SessionUpdate(sid)
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pder.lock.RUnlock()
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return element.Value.(*MemSessionStore), nil
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} else {
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pder.lock.RUnlock()
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pder.lock.Lock()
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newsess := &MemSessionStore{sid: sid, timeAccessed: time.Now(), value: make(map[interface{}]interface{})}
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element := pder.list.PushBack(newsess)
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pder.sessions[sid] = element
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pder.lock.Unlock()
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return newsess, nil
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}
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}
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// check session store exist in memory session by sid
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func (pder *MemProvider) SessionExist(sid string) bool {
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pder.lock.RLock()
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defer pder.lock.RUnlock()
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if _, ok := pder.sessions[sid]; ok {
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return true
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} else {
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return false
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}
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}
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// generate new sid for session store in memory session
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func (pder *MemProvider) SessionRegenerate(oldsid, sid string) (SessionStore, error) {
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pder.lock.RLock()
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if element, ok := pder.sessions[oldsid]; ok {
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go pder.SessionUpdate(oldsid)
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pder.lock.RUnlock()
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pder.lock.Lock()
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element.Value.(*MemSessionStore).sid = sid
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pder.sessions[sid] = element
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delete(pder.sessions, oldsid)
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pder.lock.Unlock()
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return element.Value.(*MemSessionStore), nil
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} else {
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pder.lock.RUnlock()
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pder.lock.Lock()
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newsess := &MemSessionStore{sid: sid, timeAccessed: time.Now(), value: make(map[interface{}]interface{})}
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element := pder.list.PushBack(newsess)
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pder.sessions[sid] = element
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pder.lock.Unlock()
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return newsess, nil
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}
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}
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// delete session store in memory session by id
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func (pder *MemProvider) SessionDestroy(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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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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// clean expired session stores in memory session
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func (pder *MemProvider) SessionGC() {
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pder.lock.RLock()
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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.(*MemSessionStore).timeAccessed.Unix() + pder.maxlifetime) < time.Now().Unix() {
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pder.lock.RUnlock()
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pder.lock.Lock()
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pder.list.Remove(element)
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delete(pder.sessions, element.Value.(*MemSessionStore).sid)
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pder.lock.Unlock()
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pder.lock.RLock()
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} else {
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break
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}
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}
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pder.lock.RUnlock()
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}
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// get count number of memory session
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func (pder *MemProvider) SessionAll() int {
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return pder.list.Len()
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}
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// expand time of session store by id in memory session
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func (pder *MemProvider) 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.(*MemSessionStore).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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Register("memory", mempder)
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}
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