node passport session recreate error

node passport session recreate error

when client(ex ios) send 2 request as parallels

1 request is logout
2 request is unregist push notification

2 requests have user logined cookie

so when that requests arrive at node server
passport always do upsert at user session

but if requests processed as below sequence it can make recreate session error

1. logout request do upsert by passport because request has user session info

   and it returned

2. logout

   remove session sended at DB
   and it queueed at node asycle cycle

3. DB delete user session
4. unregist push notification request do upsert by passport because request has user session info

   DB recreate user session

5. logout response returned with success
6. unregist push notification response returned with success

both request success in client
so client think logout success
but in db user session recreated with login status

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