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Fix to bug #541, http://bugs.skysql.com/show_bug.cgi?id=541

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Long ~0.5MB queries blocked MaxScale.
mysql_client.c:gw_read_client_event: Fixed packet reading logic. Reading didn't work when packet exceeded read buffer size.
mysql_common.c:gw_MySQL_get_next_packet: number of bytes to be copied to continuous buffer was calculated wrong, thus resulting in broken packet.
readwritesplit.c:disabled creation of canonical query in debug build because it slows down the processing too much with long queries
This commit is contained in:
VilhoRaatikka
2014-09-13 21:16:44 +03:00
parent d8d8232f9a
commit 2012dfdd35
3 changed files with 18 additions and 13 deletions
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23
server/modules/protocol/mysql_client.c
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@ -552,15 +552,17 @@ int gw_read_client_event(
*/
if (dcb->dcb_readqueue)
{
uint8_t* data = (uint8_t *)GWBUF_DATA(read_buffer);
uint8_t* data;
read_buffer = gwbuf_append(dcb->dcb_readqueue, read_buffer);
nbytes_read = gwbuf_length(read_buffer);
dcb->dcb_readqueue = gwbuf_append(dcb->dcb_readqueue, read_buffer);
nbytes_read = gwbuf_length(dcb->dcb_readqueue);
data = (uint8_t *)GWBUF_DATA(dcb->dcb_readqueue);
if (nbytes_read < 3 || nbytes_read < MYSQL_GET_PACKET_LEN(data))
{
rc = 0;
goto return_rc;
size_t nread = MYSQL_GET_PACKET_LEN(data);
rc = 0;
goto return_rc;
}
else
{
@ -578,7 +580,8 @@ int gw_read_client_event(
if (nbytes_read < 3 || nbytes_read < MYSQL_GET_PACKET_LEN(data)+4)
{
dcb->dcb_readqueue = gwbuf_append(dcb->dcb_readqueue, read_buffer);
size_t nread = MYSQL_GET_PACKET_LEN(data);
dcb->dcb_readqueue = gwbuf_append(dcb->dcb_readqueue, read_buffer);
rc = 0;
goto return_rc;
}
@ -789,7 +792,7 @@ int gw_read_client_event(
if (read_buffer != NULL)
{
/** add incomplete mysql packet to read queue */
gwbuf_append(dcb->dcb_readqueue, read_buffer);
dcb->dcb_readqueue = gwbuf_append(dcb->dcb_readqueue, read_buffer);
}
}
else
@ -1443,7 +1446,11 @@ static int route_by_statement(
do
{
ss_dassert(GWBUF_IS_TYPE_MYSQL((*p_readbuf)));
/**
* Collect incoming bytes to a buffer until complete packet has
* arrived and then return the buffer.
*/
packetbuf = gw_MySQL_get_next_packet(p_readbuf);
if (packetbuf != NULL)