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Always stop the session by closing the client DCB

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By always starting the session shutdown process by stopping the client
DCB, the manipulation of the session state can be removed from the backend
protocol modules and replaced with a fake hangup event.

Delivering this event via the core allows the actual dcb_close call on the
client DCB to be done only when the client DCB is being handled by a
worker.
This commit is contained in:
Markus Mäkelä
2018-02-01 01:32:22 +02:00
parent ebf0d6fc5f
commit 9f0a691233
3 changed files with 10 additions and 22 deletions
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3
server/core/session.cc
View File

@ -319,11 +319,8 @@ session_simple_free(MXS_SESSION *session, DCB *dcb)
void session_close(MXS_SESSION *session)
{
if (session->router_session)
{
if (session->state != SESSION_STATE_STOPPING)
{
session->state = SESSION_STATE_STOPPING;
}
MXS_ROUTER_OBJECT* router = session->service->router;
MXS_ROUTER* router_instance = session->service->router_instance;

2
server/modules/protocol/MySQL/mariadbbackend/mysql_backend.c
View File

@ -583,7 +583,7 @@ static void do_handle_error(DCB *dcb, mxs_error_action_t action, const char *err
*/
if (!succp)
{
session->state = SESSION_STATE_STOPPING;
poll_fake_hangup_event(session->client_dcb);
}
}

15
server/modules/protocol/MySQL/mariadbclient/mysql_client.cc
View File

@ -1401,29 +1401,20 @@ static int gw_client_close(DCB *dcb)
*/
static int gw_client_hangup_event(DCB *dcb)
{
MXS_SESSION* session;
CHK_DCB(dcb);
session = dcb->session;
MXS_SESSION* session = dcb->session;
if (session != NULL && session->state == SESSION_STATE_ROUTER_READY)
if (session)
{
CHK_SESSION(session);
}
if (session != NULL && session->state == SESSION_STATE_STOPPING)
{
goto retblock;
}
if (session->state != SESSION_STATE_DUMMY && !session_valid_for_pool(session))
{
// The client did not send a COM_QUIT packet
modutil_send_mysql_err_packet(dcb, 0, 0, 1927, "08S01", "Connection killed by MaxScale");
}
dcb_close(dcb);
}
retblock:
return 1;
}