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Fix crash in backend command tracking

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The backend protocol command tracking didn't check whether the session was
the dummy session. The DCB's session is always set to this value when it
is put into the persistent pool.
This commit is contained in:
Markus Mäkelä
2017-10-08 22:06:43 +03:00
parent 2ca050156f
commit d97742bf66
2 changed files with 27 additions and 13 deletions
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35
server/modules/protocol/MySQL/MySQLBackend/mysql_backend.c
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@ -377,23 +377,32 @@ mxs_auth_state_t handle_server_response(DCB *dcb, GWBUF *buffer)
static inline void prepare_for_write(DCB *dcb, GWBUF *buffer)
{
MySQLProtocol *proto = (MySQLProtocol*)dcb->protocol;
uint64_t capabilities = service_get_capabilities(dcb->session->service);
/**
* Copy the current command being executed to this backend. For statement
* based routers, this is tracked by using the current command being executed.
* For routers that stream data, the client protocol command tracking data
* is used which does not guarantee that the correct command is tracked if
* something queues commands internally.
* The DCB's session is set to the dummy session when it is put into the
* persistent connection pool. If this is not the dummy session, track
* the current command being executed.
*/
if (rcap_type_required(capabilities, RCAP_TYPE_STMT_INPUT))
if (!session_is_dummy(dcb->session))
{
proto->current_command = (mxs_mysql_cmd_t)MYSQL_GET_COMMAND(GWBUF_DATA(buffer));
}
else if (dcb->session->client_dcb && dcb->session->client_dcb->protocol)
{
MySQLProtocol *client_proto = (MySQLProtocol*)dcb->session->client_dcb->protocol;
proto->current_command = client_proto->current_command;
uint64_t capabilities = service_get_capabilities(dcb->session->service);
/**
* Copy the current command being executed to this backend. For statement
* based routers, this is tracked by using the current command being executed.
* For routers that stream data, the client protocol command tracking data
* is used which does not guarantee that the correct command is tracked if
* something queues commands internally.
*/
if (rcap_type_required(capabilities, RCAP_TYPE_STMT_INPUT))
{
proto->current_command = (mxs_mysql_cmd_t)MYSQL_GET_COMMAND(GWBUF_DATA(buffer));
}
else if (dcb->session->client_dcb && dcb->session->client_dcb->protocol)
{
MySQLProtocol *client_proto = (MySQLProtocol*)dcb->session->client_dcb->protocol;
proto->current_command = client_proto->current_command;
}
}
if (GWBUF_IS_TYPE_SESCMD(buffer))