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Fixed queries being routed when the session is already closing.

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This commit is contained in:
Markus Makela 2015-07-07 13:15:23 +03:00
parent c2e51f2e98
commit fb09cbf100
5 changed files with 89 additions and 77 deletions
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1
server/core/buffer.c
View File

@ -197,6 +197,7 @@ GWBUF *rval;
rval->gwbuf_info = buf->gwbuf_info;
rval->gwbuf_bufobj = buf->gwbuf_bufobj;
rval->tail = rval;
rval->next = NULL;
CHK_GWBUF(rval);
return rval;
}

11
server/modules/protocol/mysql_backend.c
View File

@ -1080,7 +1080,7 @@ gw_backend_hangup(DCB *dcb)
len = sizeof(error);
if (getsockopt(dcb->fd, SOL_SOCKET, SO_ERROR, &error, (socklen_t *)&len) == 0)
{
if (error != 0)
if (error != 0 && ses_state != SESSION_STATE_STOPPING)
{
strerror_r(error, buf, 100);
LOGIF(LE, (skygw_log_write_flush(
@ -1094,9 +1094,12 @@ gw_backend_hangup(DCB *dcb)
goto retblock;
}
#if defined(SS_DEBUG)
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Backend hangup error handling.")));
if(ses_state != SESSION_STATE_STOPPING)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Backend hangup error handling.")));
}
#endif
router->handleError(router_instance,

140
server/modules/protocol/mysql_client.c
View File

@ -1092,7 +1092,8 @@ int gw_read_client_event(
case MYSQL_IDLE:
{
uint8_t* payload = NULL;
session_state_t ses_state;
session = dcb->session;
ss_dassert(session!= NULL);
@ -1100,93 +1101,106 @@ int gw_read_client_event(
{
CHK_SESSION(session);
}
spinlock_acquire(&session->ses_lock);
ses_state = session->state;
spinlock_release(&session->ses_lock);
/* Now, we are assuming in the first buffer there is
* the information form mysql command */
payload = GWBUF_DATA(read_buffer);
/** Route COM_QUIT to backend */
if (MYSQL_IS_COM_QUIT(payload))
{
if(ses_state == SESSION_STATE_ROUTER_READY)
{
/** Route COM_QUIT to backend */
if (MYSQL_IS_COM_QUIT(payload))
{
/**
* Sends COM_QUIT packets since buffer is already
* created. A BREF_CLOSED flag is set so dcb_close won't
* send redundant COM_QUIT.
*/
* Sends COM_QUIT packets since buffer is already
* created. A BREF_CLOSED flag is set so dcb_close won't
* send redundant COM_QUIT.
*/
SESSION_ROUTE_QUERY(session, read_buffer);
/**
* Close router session which causes closing of backends.
*/
* Close router session which causes closing of backends.
*/
dcb_close(dcb);
}
else
{
}
else
{
/** Reset error handler when routing of the new query begins */
router->handleError(NULL, NULL, NULL, dcb, ERRACT_RESET, NULL);
if (stmt_input)
{
/**
* Feed each statement completely and separately
* to router.
*/
rc = route_by_statement(session, &read_buffer);
if (read_buffer != NULL)
{
/** add incomplete mysql packet to read queue */
dcb->dcb_readqueue = gwbuf_append(dcb->dcb_readqueue, read_buffer);
}
/**
* Feed each statement completely and separately
* to router.
*/
rc = route_by_statement(session, &read_buffer);
if (read_buffer != NULL)
{
/** add incomplete mysql packet to read queue */
dcb->dcb_readqueue = gwbuf_append(dcb->dcb_readqueue, read_buffer);
}
}
else
{
/** Feed whole packet to router */
rc = SESSION_ROUTE_QUERY(session, read_buffer);
/** Feed whole packet to router */
rc = SESSION_ROUTE_QUERY(session, read_buffer);
}
/** Routing succeed */
if (rc)
{
rc = 0; /**< here '0' means success */
rc = 0; /**< here '0' means success */
}
else
{
bool succp;
GWBUF* errbuf;
/**
* Create error to be sent to client if session
* can't be continued.
*/
errbuf = mysql_create_custom_error(
1,
0,
"Routing failed. Session is closed.");
/**
* Ensure that there are enough backends
* available.
*/
router->handleError(
router_instance,
session->router_session,
errbuf,
dcb,
ERRACT_NEW_CONNECTION,
&succp);
gwbuf_free(errbuf);
/**
* If there are not enough backends close
* session
*/
if (!succp)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Routing the query failed. "
"Session will be closed.")));
bool succp;
GWBUF* errbuf;
/**
* Create error to be sent to client if session
* can't be continued.
*/
errbuf = mysql_create_custom_error(
1,
0,
"Routing failed. Session is closed.");
/**
* Ensure that there are enough backends
* available.
*/
router->handleError(
router_instance,
session->router_session,
errbuf,
dcb,
ERRACT_NEW_CONNECTION,
&succp);
gwbuf_free(errbuf);
/**
* If there are not enough backends close
* session
*/
if (!succp)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Routing the query failed. "
"Session will be closed.")));
dcb_close(dcb);
}
dcb_close(dcb);
}
}
}
}
}
else
{
skygw_log_write_flush(LT,"Session received a query in state %s",
STRSESSIONSTATE(ses_state));
while((read_buffer = GWBUF_CONSUME_ALL(read_buffer)) != NULL);
goto return_rc;
}
goto return_rc;
} /* MYSQL_IDLE */
break;

12
server/modules/routing/readconnroute.c
View File

@ -723,16 +723,10 @@ routeQuery(ROUTER *instance, void *router_session, GWBUF *queue)
SERVER_IS_DOWN(router_cli_ses->backend->server))
{
LOGIF(LT, (skygw_log_write(
LOGFILE_TRACE,
LOGFILE_TRACE|LOGFILE_ERROR,
"Error : Failed to route MySQL command %d to backend "
"server.",
mysql_command)));
skygw_log_write(
LOGFILE_ERROR,
"Error : Failed to route MySQL command %d to backend "
"server %s.",
mysql_command,
router_cli_ses->backend->server->unique_name);
"server.%s",
mysql_command,rses_is_closed ? " Session is closed." : "")));
rc = 0;
goto return_rc;

2
server/modules/routing/readwritesplit/readwritesplit.c
View File

@ -3915,7 +3915,7 @@ static GWBUF* sescmd_cursor_clone_querybuf(
}
ss_dassert(scur->scmd_cur_cmd != NULL);
buf = gwbuf_clone(scur->scmd_cur_cmd->my_sescmd_buf);
buf = gwbuf_clone_all(scur->scmd_cur_cmd->my_sescmd_buf);
CHK_GWBUF(buf);
return buf;