forked from mattn/go-session-manager
/
session.go
142 lines (128 loc) · 3.1 KB
/
session.go
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package session
import (
"crypto/rand"
"fmt"
"log"
"net/http"
"sync"
"time"
)
type Session struct {
Id string
Value interface{}
expire int64
manager *SessionManager
res http.ResponseWriter
}
type SessionManager struct {
sessionMap map[string]*Session
onStart func(*Session)
onEnd func(*Session)
timeout uint
mutex sync.RWMutex
}
func (session *Session) Abandon() {
_, found := (*session.manager).sessionMap[session.Id]
if found {
delete((*session.manager).sessionMap, session.Id)
}
if session.res != nil {
session.res.Header().Set("Set-Cookie", "SessionId=; path=/;")
}
}
func (session *Session) Cookie() string {
tm := time.Unix(session.expire, 0).UTC()
return fmt.Sprintf("SessionId=%s; path=/; expires=%s;", session.Id, tm.Format("Fri, 02-Jan-2006 15:04:05 -0700"))
}
func NewSessionManager(logger *log.Logger) *SessionManager {
manager := new(SessionManager)
manager.sessionMap = make(map[string]*Session)
manager.timeout = 300
go func(manager *SessionManager) {
for {
l := time.Now().Unix()
for id, v := range (*manager).sessionMap {
if v.expire < l {
// expire
if logger != nil {
logger.Printf("Expired session(id:%s)", id)
}
f := (*manager).onEnd
if f != nil {
f((*manager).sessionMap[id])
}
delete((*manager).sessionMap, id)
}
}
time.Sleep(1000000000)
}
}(manager)
return manager
}
func (manager *SessionManager) OnStart(f func(*Session)) {
manager.onStart = f
}
func (manager *SessionManager) Abandon() {
f := (*manager).onEnd
for id, _ := range (*manager).sessionMap {
if f != nil {
f((*manager).sessionMap[id])
}
delete((*manager).sessionMap, id)
}
}
func (manager *SessionManager) OnEnd(f func(*Session)) {
manager.onEnd = f
}
func (manager *SessionManager) SetTimeout(t uint) {
manager.timeout = t
}
func (manager *SessionManager) GetTimeout() uint {
return manager.timeout
}
func (manager *SessionManager) GetSessionById(id string) (session *Session) {
manager.mutex.Lock()
defer manager.mutex.Unlock()
if id == "" || !manager.Has(id) {
b := make([]byte, 16)
_, err := rand.Read(b)
if err != nil {
return
}
id = fmt.Sprintf("%x", b)
}
tm := time.Unix(time.Now().Unix()+int64(manager.timeout), 0).UTC()
var found bool
session, found = (*manager).sessionMap[id]
if !found {
session = &Session{id, nil, tm.Unix(), manager, nil}
(*manager).sessionMap[id] = session
f := (*manager).onStart
if f != nil {
f(session)
}
} else {
session.expire = tm.Unix()
}
return
}
func (manager *SessionManager) GetSession(res http.ResponseWriter, req *http.Request) (session *Session) {
if c, _ := req.Cookie("SessionId"); c != nil {
session = manager.GetSessionById(c.Value)
} else {
session = manager.GetSessionById("")
}
if res != nil {
session.res = res
res.Header().Add("Set-Cookie",
fmt.Sprintf("SessionId=%s; path=/; expires=%s;",
session.Id,
time.Unix(session.expire, 0).UTC().Format(
"Fri, 02-Jan-2006 15:04:05 -0700")))
}
return
}
func (manager *SessionManager) Has(id string) (found bool) {
_, found = (*manager).sessionMap[id]
return
}