In PR #37300, Alexej asked why we the compiler does not warn about
unnecessary semicolons, e.g.
f()
{
}; // <-- here
The answer is surprising: In C++98, above syntax was disallowed but by
most compilers accepted it regardless. C++>11 introduced "empty
declarations" which made the syntax legal.
The previous behavior can be restored using flag
-Wc++98-compat-extra-semi. This finds many useless semicolons which were
removed in this change. Unfortunately, there are also false positives
which would require #pragma-s and HAS_* logic (--> check_flags.cmake) to
suppress. In the end, -Wc++98-compat-extra-semi comes with extra effort
for little benefit. Therefore, this change only fixes some semicolons
but does not enable the flag.
Official docs:
Correct indentation helps to understand code. Mismatch of the
syntactical structure and the indentation of the code may hide serious
problems.
- Move some code into module part to avoid dependency from IStorage in SystemLog
- Remove extra headers from SystemLog.h
- Rewrite some code that was relying on headers that was included by SystemLog.h
v2: rebase
v3: squash move into module part with explicit template instantiation
(to make each commit self compilable after rebase)
Which logs all the info about LogIn, LogOut and LogIn Failure events.
Additional info that is logged:
- User name
- event type (LogIn, LogOut, LoginFailure)
- Event date\time\time with microseconds
- authentication type (same as for IDENTIFIED BY of CREATE USER statement)
- array of active settings profiles upon login
- array of active roles upon login
- array of changed settings with corresponding values
- client address and port
- interface (TCP\HTTP\MySQL\PostgreSQL, etc.)
- client info (name, version info)
- optional LoginFailure reason text message.
Added some tests to verify that events are properly saved with all necessary info via following interfaces:
- TCP
- HTTP
- MySQL
Known limitations
- Not tested against named HTTP sessions, PostgreSQL and gRPC, hence those are not guaranteed to work 100% properly.
