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Don't refer @transaction_state directly

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Since 8180c39, remaining transaction state is cleared in
`force_clear_transaction_record_state` to less work
`sync_with_transaction_state`. But it caused a race condition that
`@transaction_state` would be cleared by other threads if the state is
finalized.

To work as before, snapshot `@transaction_state` to local variable not
to refer `@transaction_state` directly.

Fixes #35983.
This commit is contained in:
Ryuta Kamizono 2019-04-16 08:11:59 +09:00
parent 60afbfffdc
commit f7e126beae
1 changed files with 5 additions and 5 deletions
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10
activerecord/lib/active_record/transactions.rb
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@ -472,13 +472,13 @@ module ActiveRecord
# the TransactionState, and rolls back or commits the Active Record object
# as appropriate.
def sync_with_transaction_state
if @transaction_state && @transaction_state.finalized?
if @transaction_state.fully_committed?
if (transaction_state = @transaction_state)&.finalized?
if transaction_state.fully_committed?
force_clear_transaction_record_state
elsif @transaction_state.committed?
elsif transaction_state.committed?
clear_transaction_record_state
elsif @transaction_state.rolledback?
force_restore_state = @transaction_state.fully_rolledback?
elsif transaction_state.rolledback?
force_restore_state = transaction_state.fully_rolledback?
restore_transaction_record_state(force_restore_state)
clear_transaction_record_state
end