whitfin / cachex / d60cdbd9917f8f93f0e4ded25519adefd65665c2-PR-439

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Pull #439

github

Enforce key locking for nested transactions

Nested transactions previously short-circuited on a boolean flag and ran
the function without acquiring locks, so an inner transaction locking a
different key than the enclosing one would proceed with no locking in place.

Store the set of locked keys in :cachex_transaction instead of a boolean so
a nested transaction can verify that every key it requests is already locked
by the enclosing transaction, raising a Cachex.Error otherwise.

Refs #431

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