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manager.go
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manager.go
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package session
import (
"crypto/rand"
"encoding/base64"
"io"
"net/http"
"net/url"
"strconv"
"sync"
"time"
)
type (
Session struct {
sessionID string
lastTimeAccessed time.Time
values map[interface{}]interface{}
}
Manager struct {
cookieName string
mu sync.RWMutex
maxLifeTime int64
session map[string]*Session
}
)
// NewSessionManager return a session manager
func NewSessionManager(cookieName string, maxLifeTime int64) *Manager {
mgr := &Manager{
cookieName: cookieName,
maxLifeTime: maxLifeTime,
session: nil,
mu: sync.RWMutex{},
}
go mgr.GC()
return mgr
}
//Start Start session return sessionID
func (m *Manager) Start(w http.ResponseWriter, r *http.Request) string {
m.mu.Lock()
defer m.mu.Unlock()
var (
sessionID string
)
ck, err := r.Cookie(m.cookieName)
if err == nil && ck != nil && ck.Value != "" {
sessionID = ck.Value
}
if sessionID != "" && m.session != nil {
return sessionID
}
sessionID = url.QueryEscape(m.makeNewSessionID())
session := &Session{
sessionID: sessionID,
lastTimeAccessed: time.Now(),
values: make(map[interface{}]interface{}),
}
m.session = make(map[string]*Session)
m.session[sessionID] = session
cookie := http.Cookie{
Name: m.cookieName,
Value: sessionID,
Path: "/",
HttpOnly: true,
MaxAge: int(m.maxLifeTime),
}
http.SetCookie(w, &cookie)
return sessionID
}
// End end session
// delete sessionID from cookie and map
func (m *Manager) End(w http.ResponseWriter, r *http.Request) {
ck, err := r.Cookie(m.cookieName)
if err != nil || ck.Value == "" {
return
} else {
m.mu.Lock()
defer m.mu.Unlock()
//delete map key
delete(m.session, ck.Value)
exp := time.Now()
cookie := http.Cookie{
Name: m.cookieName,
Path: "/",
HttpOnly: true,
Expires: exp,
MaxAge: -1,
}
http.SetCookie(w, &cookie)
}
}
// Extension
func (m *Manager) Extension(w http.ResponseWriter, r *http.Request) string {
ck, err := r.Cookie(m.cookieName)
if err != nil || ck == nil {
return ""
}
m.mu.Lock()
defer m.mu.Unlock()
sessionID := ck.Value
if session, ok := m.session[sessionID]; ok {
session.lastTimeAccessed = time.Now()
return sessionID
}
return ""
}
// Get get session value
func (m *Manager) Get(sessionID string, key interface{}) (interface{}, bool) {
m.mu.RLock()
defer m.mu.RUnlock()
if session, ok := m.session[sessionID]; ok {
if val, ok := session.values[key]; ok {
return val, ok
}
}
return nil, false
}
// Set set session
func (m *Manager) Set(sessionID string, key, value interface{}) {
m.mu.Lock()
defer m.mu.Unlock()
if session, ok := m.session[sessionID]; ok {
session.values[key] = value
}
}
//Delete delete value by key
func (m *Manager) Delete(sessionID string, key interface{}) {
m.mu.Lock()
defer m.mu.Unlock()
if session, ok := m.session[sessionID]; ok {
delete(session.values, key)
}
}
// GC session gc
func (m *Manager) GC() {
m.mu.Lock()
defer m.mu.Unlock()
for sessionID, session := range m.session {
if session.lastTimeAccessed.Unix()+m.maxLifeTime < time.Now().Unix() {
delete(m.session, sessionID)
}
}
time.AfterFunc(time.Duration(m.maxLifeTime)*time.Second, func() {
m.GC()
})
}
// makeNewSessionID
func (m *Manager) makeNewSessionID() string {
b := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, b); err != nil {
nano := time.Now().UnixNano()
return strconv.FormatInt(nano, 10)
}
return base64.URLEncoding.EncodeToString(b)
}