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Add fix for duplicating COM_QUIT, COM_INIT_DB and COM_CHANGE_USER packets

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This commit is contained in:
Mark Riddoch 2014-12-12 09:45:52 +00:00
parent 3ffa585fe4
commit 680f7ef2c1
1 changed files with 32 additions and 0 deletions
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32
server/modules/filter/tee.c
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@ -41,6 +41,7 @@
* Date Who Description
* 20/06/2014 Mark Riddoch Initial implementation
* 24/06/2014 Mark Riddoch Addition of support for multi-packet queries
* 12/12/2014 Mark Riddoch Add support for otehr packet types
*
* @endverbatim
*/
@ -58,6 +59,10 @@
#include <router.h>
#include <dcb.h>
#define MYSQL_COM_QUIT 0x01
#define MYSQL_COM_INITDB 0x02
#define MYSQL_COM_CHANGE_USER 0x11
/** Defined in log_manager.cc */
extern int lm_enabled_logfiles_bitmask;
extern size_t log_ses_count[];
@ -128,6 +133,7 @@ typedef struct {
int residual; /* Any outstanding SQL text */
} TEE_SESSION;
static int packet_is_required(GWBUF *queue);
/**
* Implementation of the mandatory version entry point
*
@ -429,6 +435,10 @@ GWBUF *clone = NULL;
}
free(ptr);
}
else if (packet_is_required(queue))
{
clone = gwbuf_clone(queue);
}
/* Pass the query downstream */
rval = my_session->down.routeQuery(my_session->down.instance,
@ -484,3 +494,25 @@ TEE_SESSION *my_session = (TEE_SESSION *)fsession;
my_session->n_rejected);
}
}
/**
* Determine if the packet is a command that must be sent to the branch
* to maintain the session consistancy. These are COM_INIT_DB,
* COM_CHANGE_USER and COM_QUIT packets.
*
* @param queue The buffer to check
* @return non-zero if the packet should be sent to the branch
*/
static int
packet_is_required(GWBUF *queue)
{
uint8_t *ptr;
ptr = GWBUF_DATA(queue);
if (GWBUF_LENGTH(queue) > 4 &&
(ptr[4] == MYSQL_COM_QUIT || ptr[4] == MYSQL_COM_INITDB
|| ptr[4] == MYSQL_COM_CHANGE_USER))
return 1;
else
return 0;
}