Minor renaming of the session state enum values. Also exposed the session
state stringification function in the public header and removed the
stringification macro.
Fixed the use of DCBs and sessions in the mock testing framework and
adapted them to the changes done to the objects in question. Extended the
testing utility functions to allow preloading modules as well as making it
possible to only partially initialize the query classifier.
Allocating the session before a DCB guarantees that at no point will a DCB
have a null session. This further clarifies the concept of the session and
also allows the listener reference to be moved there.
Ideally, the session itself would allocate and assign the client DCB but
since the Listener is the only one who does it, it's acceptable for now.
As each connection now immediately gets a session the dummy session is no
longer required. The next step would be to combine parts of the session
and the client DCB into one entity. This would prevent the possibility of
a client DCB with no associated session. Backend DCBs are different as
they can move from one session to another when the persistent connection
pool is in use.
Allocating DCB with new allows the use of C++ objects in the DCB
struct. Also the explicit poll field can be replaced by inheriting from
MXB_POLL_DATA.
Clean up, comments and enhancements. StopWatch lap() didn't mean lap-time, but elapsed time. Changed meaning to lap-time and added split() for split-time.
Replaced SPINLOCK with std::mutex where possible, leaving out the more
complex cases. The big offenders remaining are the binlogrouter and the
gateway.cc OpenSSL locks.
Removed unused code, ordered function definitions that declarations aren't
needed, changed functions to pass pointers to the event body instead of
the start of the protocol packet.
Added `match` and `exclude` functionality. This allows versatile filtering
without a large investment of development time by leveraging the benefits
of PCRE2 regular expressions.
Also cleaned up the filter and removed the single table matching and
active parameter that were obsoleted by the regular expression parameters.
