When debugging you occasionally want to find out what a packet
contains (e.g. delivered to clientReply). Manually looking into
the packet works, but is tedious. With this function you when
the execution has been stopped in GDB examine a protocol packet.
E.g.
Thread 3 "maxscale" hit Breakpoint 6, RWSplitSession::clientReply (this=0x7fffe401ed20, writebuf=0x7fffe401e910, backend_dcb=0x7fffe401dbe0) at /home/wikman/MariaDB/MaxScale/server/modules/routing/readwritesplit/rwsplitsession.cc:567
567 DCB* client_dcb = backend_dcb->session->client_dcb;
(gdb) p dbg_decode_response(writebuf)
$30 = 0x7ffff0d40d54 "Packet no: 1, Payload len: 44, Command : ERR, Code: 1146, Message : Table 'test.blahasdf' doesn't exist"
d2f31aab0a