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Fix to bug #678, http://bugs.skysql.com/show_bug.cgi?id=678

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tee.c:routeQuery cloned partial MySQL packets to be routed to child router. Problems were due to the use of gwbuf_clone and modutil_MySQL_query which clone/examine only the first buffer from the buffer list which composes GWBUF.
modutil.c: Added function modutil_MySQL_query_len which calculates MySQL packet length and the missing bytecount
This commit is contained in:
VilhoRaatikka
2015-01-02 18:32:57 +02:00
parent 48f443782e
commit 6228be4284
8 changed files with 88 additions and 19 deletions
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37
server/core/modutil.c
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@ -121,6 +121,41 @@ unsigned char *ptr;
return 1;
}
/**
* Calculate the length of MySQL packet and how much is missing from the GWBUF
* passed as parameter.
*
* This routine assumes that there is only one MySQL packet in the buffer.
*
* @param buf buffer list including the query, may consist of
* multiple buffers
* @param nbytes_missing pointer to missing bytecount
*
* @return the length of MySQL packet and writes missing bytecount to
* nbytes_missing.
*/
int modutil_MySQL_query_len(
GWBUF* buf,
int* nbytes_missing)
{
int len;
int buflen;
uint8_t data;
if (!modutil_is_SQL(buf))
{
len = 0;
goto retblock;
}
len = MYSQL_GET_PACKET_LEN((uint8_t *)GWBUF_DATA(buf));
*nbytes_missing = len-1;
buflen = gwbuf_length(buf);
*nbytes_missing -= buflen-5;
retblock:
return len;
}
/**
@ -178,7 +213,7 @@ GWBUF *addition;
/**
* Extract the SQL from a COM_QUERY packet and return in a NULL terminated buffer.
* The buffer shoudl be freed by the caller when it is no longer required.
* The buffer should be freed by the caller when it is no longer required.
*
* If the packet is not a COM_QUERY packet then the function will return NULL
*