tree 4db8872af305e5ab4d5d1b525c35ffad51651c47
parent 7fc52c8fe3bc7cc9b57a007ce1b7c38e60f9602f
author Kun Yi <kunyi731@gmail.com> 1573627834 -0800
committer Kun Yi <kunyi731@gmail.com> 1574200255 -0800

Implement session expiration

If the caller opens sessions but doesn't close them, either
intentionally or unintentionally, session IDs will leak. Once the
maximum number of sessions are reached, no new session can be opened.

Implement a cleanup procedure to automatically remove stale sessions. If
a session hasn't seen activity for a while, call the expire()
functions on the handler, and remove the session from tracking table.
For handlers that haven't implemented the expire() call this change will
be a no-op.

Signed-off-by: Kun Yi <kunyi731@gmail.com>
Change-Id: I895ae19b4003d2d6f7a0b2e73370fe5aa664adee