// SessionFilter is a Revel Filter that retrieves and sets the session cookie.
// Within Revel, it is available as a Session attribute on Controller instances.
// The name of the Session cookie is set as CookiePrefix + "_SESSION".
func SessionFilter(c *revel.Controller, fc []revel.Filter) {
session := restoreSession(c.Request.Request)
// c.Session, 重新生成一个revel.Session给controller!!!
// Log("sessoin--------")
// LogJ(session)
revelSession := revel.Session(session) // 强制转换 还是同一个对象, 但有个问题, 这样Session.Id()方法是用revel的了
c.Session = revelSession
// 生成sessionId
c.Session.Id()
sessionWasEmpty := len(c.Session) == 0
// Make session vars available in templates as {{.session.xyz}}
c.RenderArgs["session"] = c.Session
fc[0](c, fc[1:])
// Store the signed session if it could have changed.
if len(c.Session) > 0 || !sessionWasEmpty {
// 转换成lea.Session
session = Session(c.Session)
c.SetCookie(session.cookie())
}
}