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Fix to MXS-270: https://mariadb.atlassian.net/browse/MXS-270

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Prepared statement query responses in multiple buffers are now handled properly.
This commit is contained in:
Markus Makela 2015-08-19 17:48:24 +03:00
parent 3f26c306c5
commit 2d9814e0f3
1 changed files with 16 additions and 7 deletions
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23
server/modules/protocol/mysql_backend.c
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@ -541,7 +541,7 @@ static int gw_read_backend_event(DCB *dcb) {
if (protocol_get_srv_command((MySQLProtocol *)dcb->protocol, false) !=
MYSQL_COM_UNDEFINED)
{
read_buffer = process_response_data(dcb, read_buffer, nbytes_read);
read_buffer = process_response_data(dcb, read_buffer, gwbuf_length(read_buffer));
/**
* Received incomplete response to session command.
* Store it to readqueue and return.
@ -1517,7 +1517,9 @@ static GWBUF* process_response_data (
ssize_t nbytes_left = 0; /*< nbytes to be read for the packet */
MySQLProtocol* p;
GWBUF* outbuf = NULL;
int initial_packets = npackets_left;
ssize_t initial_bytes = nbytes_left;
/** Get command which was stored in gw_MySQLWrite_backend */
p = DCB_PROTOCOL(dcb, MySQLProtocol);
if (!DCB_IS_CLONE(dcb)) CHK_PROTOCOL(p);
@ -1560,11 +1562,13 @@ static GWBUF* process_response_data (
* enough data to read the packet length.
*/
init_response_status(readbuf, srvcmd, &npackets_left, &nbytes_left);
initial_packets = npackets_left;
initial_bytes = nbytes_left;
}
}
/** Only session commands with responses should be processed */
ss_dassert(npackets_left > 0);
/** Read incomplete packet. */
if (nbytes_left > nbytes_to_process)
{
@ -1639,10 +1643,15 @@ static GWBUF* process_response_data (
wait for more data from the backend server.*/
if(readbuf == NULL || GWBUF_LENGTH(readbuf) < 3)
{
skygw_log_write(LD," %lu [%s] Read %s packet with %d bytes. Waiting for %d packets.",
pthread_self(),__FUNCTION__,readbuf?"partial":"empty",
readbuf?GWBUF_LENGTH(readbuf):0,npackets_left);
break;
skygw_log_write(LD," %lu [%s] Read %d packets. Waiting for %d more packets for a total of %d packets.",
pthread_self(),__FUNCTION__,initial_packets - npackets_left,
npackets_left,initial_packets);
/** Store the already read data into the readqueue of the DCB
* and restore the response status to the initial number of packets */
dcb->dcb_readqueue = gwbuf_append(outbuf,dcb->dcb_readqueue);
protocol_set_response_status(p, initial_packets, initial_bytes);
return NULL;
}
data = GWBUF_DATA(readbuf);