[sql-14] sessions: atomic session creation #980
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session_rpcserver.go
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| if err := s.cfg.db.CreateSession(sess); err != nil { | ||
| sess, err = s.cfg.db.CreateSession(sess.ID) |
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note: in this follow up, we add a way to do this in one go for normal (non-autopilot) sessions
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In this commit, we let StateReserved be the new initial state of a session for when NewSession is called. We then do predicate checks for linked sessions along with unique session alias (ID) and priv key derivations all under the same DB transaction in NewSession. ShiftState then moves a session to StateCreated. Only in StateCreated does a session become usable. With this change, we no longer need to ensure atomic session creation by acquiring the `sessRegMu` mutex in the session RPC server.
This was used to check that all linked sessions are no longer active before attempting to register an autopilot session. But this is no longer needed since this is done within NewSession.
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See #979 for more context.
In this PR, we do the refactor to make session creation happen in 1 atomic DB transaction as described in the issue above.
Fixes #979