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websession.go
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websession.go
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package webui
import (
"math/rand"
"sync"
"time"
"github.com/go-macaron/session"
"gopkg.in/macaron.v1"
)
const (
// SessKeyUserID UserID auth type
SessKeyUserID = "uid"
)
var sessionManager *session.Manager
var sessionOptions *session.Options
var startSessionGC func()
var getSessionCount func() int
var mutex sync.Mutex
func init() {
startSessionGC = func() {
sessionManager.GC()
time.AfterFunc(time.Duration(sessionOptions.Gclifetime)*time.Second, startSessionGC)
}
getSessionCount = func() int {
return sessionManager.Count()
}
}
func prepareOptions(opt *session.Options) *session.Options {
if len(opt.Provider) == 0 {
opt.Provider = "memory"
}
if len(opt.ProviderConfig) == 0 {
opt.ProviderConfig = "data/sessions"
}
if len(opt.CookieName) == 0 {
opt.CookieName = "pseriescollector-session"
}
if len(opt.CookiePath) == 0 {
opt.CookiePath = "/"
}
if opt.Gclifetime == 0 {
opt.Gclifetime = 3600
}
if opt.Maxlifetime == 0 {
opt.Maxlifetime = opt.Gclifetime
}
if opt.IDLength == 0 {
opt.IDLength = 16
}
return opt
}
// Sessioner session handler
func Sessioner(options session.Options) macaron.Handler {
var err error
sessionOptions = prepareOptions(&options)
sessionManager, err = session.NewManager(options.Provider, options)
if err != nil {
panic(err)
}
// start GC threads after some random seconds
rndSeconds := 10 + rand.Int63n(180)
time.AfterFunc(time.Duration(rndSeconds)*time.Second, startSessionGC)
return func(ctx *Context) {
mutex.Lock()
defer mutex.Unlock()
ctx.Next()
if err = ctx.Session.Release(); err != nil {
panic("session(release): " + err.Error())
}
}
}
// GetSession get Session
func GetSession() SessionStore {
return &SessionWrapper{manager: sessionManager}
}
// SessionStore where to store sessions
type SessionStore interface {
// Set sets value to given key in session.
Set(interface{}, interface{}) error
// Get gets value by given key in session.
Get(interface{}) interface{}
// ID returns current session ID.
ID() string
// Release releases session resource and save data to provider.
Release() error
// Destory deletes a session.
Destory(*Context) error
// init
Start(*Context) error
}
// SessionWrapper wrapper for session handlers
type SessionWrapper struct {
session session.RawStore
manager *session.Manager
}
// Start start
func (s *SessionWrapper) Start(c *Context) error {
var err error
s.session, err = s.manager.Start(c.Context)
return err
}
// Set session setter
func (s *SessionWrapper) Set(k interface{}, v interface{}) error {
if s.session != nil {
return s.session.Set(k, v)
}
return nil
}
// Get Session getter
func (s *SessionWrapper) Get(k interface{}) interface{} {
if s.session != nil {
return s.session.Get(k)
}
return nil
}
// ID get Session ID
func (s *SessionWrapper) ID() string {
if s.session != nil {
return s.session.ID()
}
return ""
}
// Release release session
func (s *SessionWrapper) Release() error {
if s.session != nil {
return s.session.Release()
}
return nil
}
// Destory destory
func (s *SessionWrapper) Destory(c *Context) error {
if s.session != nil {
if err := s.manager.Destory(c.Context); err != nil {
return err
}
s.session = nil
}
return nil
}