Added function poll.c:poll_add_epollin_event_to_dcb which adds given event and related GWBUF to given DCB. The DCB is then added to event queue list so that its even becomes executed as soon as any of the threads start to process events next time.
The problem solved is case where COM_CHANGE_USER failed due to authentication failure. An error should be sent to the client but it was sent once per failed backend authentication instead of just once.
Thread which failed in authentication bypassed router and thus replies weren't filtered out. Solution adds an event and a GWBUF including error message to DCB and the DCB is then added to event queue. Thus the error message appeares like it was an incoming event and becomes processed properly.
An addition was made to mysql_backend.c:gw_read_backend_event so that self-generated event can be processed. Even if socket read doesn't manage to read anything, function proceeds if there is enough data in DCB's readqueue.
Fix ti bug #602, http://bugs.mariadb.com/show_bug.cgi?id=602
Added function sescmd_response_complete which checks if the read data completes session command response packet(s). Function is called only if there's a sessoin command being executed.
buffer.c:gwbuf_make_contiguous: hint wasn't duplicated to new GWBUF struct. As a result hints were lost if query rewriting resulted in longer query than the original.
buffer.c:gwbuf_make_contiguous: when new buffer is created, copy original buffer's type to new buffer
modutil.c:modutil_replace_SQL: when new bugger is added to GWBUF, copy original buffer's type to new buffer
In all filters, merge all buffers of GWBUF to one before calling modutil:extract_SQL
MySQL Auth with dbname check
Unknown database ‘xxxxx’ is returned to client
Proper error number is still missing and also com_change_user need to
be fixed
log_manager.cc:
Log manager handles cases where there are mismatch in user privileges.
Mark log files enabled in the global lm_enabled_logfiles_bitmask after initialization so that it reflects reality in error cases. In general, take into account the possibility that any phase in initialization may fail and read return values.
Replaced file_exists_and_is_writable to check_file_and_path which has a slightly different logic and which detects if file open fails for a few different reasons.
Improved logging (in stderr) in general in error cases.
gateway.c: Also check home directory accessibility in case when it is provided as a command-line argument. Added function check_dir_access to provide that function. Read return value of skysql_logmanager_init and exit (nicely) if it failed.
skygw_utils.cc: initialize mlist with version number 2, which indicates that object is initialized (different than zero) and that there are no active updates on the object (version%2==0).
