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MXS-1506: Fix handle_causal_read_reply

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The function did not return the changed buffer to the caller of the
function.
This commit is contained in:
Markus Mäkelä 2018-04-08 08:20:20 +03:00
parent 52c55a365e
commit f124e388fa
No known key found for this signature in database
GPG Key ID: 72D48FCE664F7B19
2 changed files with 30 additions and 38 deletions
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66
server/modules/routing/readwritesplit/rwsplitsession.cc
View File

@ -281,19 +281,15 @@ SRWBackend& RWSplitSession::get_backend_from_dcb(DCB *dcb)
*/
void RWSplitSession::correct_packet_sequence(GWBUF *buffer)
{
if (m_wait_gtid_state == EXPECTING_REAL_RESULT)
{
uint8_t header[3];
uint32_t offset = 0;
uint8_t header[3];
uint32_t offset = 0;
while (gwbuf_copy_data(buffer, offset, 3, header) == 3)
{
uint32_t packet_len = MYSQL_GET_PAYLOAD_LEN(header) + MYSQL_HEADER_LEN;
uint8_t *seq = gwbuf_byte_pointer(buffer, offset + MYSQL_SEQ_OFFSET);
*seq = m_next_seq;
m_next_seq++;
offset += packet_len;
}
while (gwbuf_copy_data(buffer, offset, 3, header) == 3)
{
uint32_t packet_len = MYSQL_GET_PAYLOAD_LEN(header) + MYSQL_HEADER_LEN;
uint8_t *seq = gwbuf_byte_pointer(buffer, offset + MYSQL_SEQ_OFFSET);
*seq = m_next_seq++;
offset += packet_len;
}
}
@ -331,36 +327,32 @@ static void log_unexpected_response(DCB* dcb, GWBUF* buffer)
}
}
bool RWSplitSession::handle_causal_read_reply(GWBUF *writebuf, SRWBackend& backend)
GWBUF* RWSplitSession::handle_causal_read_reply(GWBUF *writebuf, SRWBackend& backend)
{
bool rval = true;
if (m_config.enable_causal_read &&
GWBUF_IS_REPLY_OK(writebuf) &&
backend == m_current_master)
if (m_config.enable_causal_read)
{
/** Save gtid position */
char *tmp = gwbuf_get_property(writebuf, (char *)"gtid");
if (tmp)
if (GWBUF_IS_REPLY_OK(writebuf) && backend == m_current_master)
{
m_gtid_pos = std::string(tmp);
/** Save gtid position */
char *tmp = gwbuf_get_property(writebuf, (char *)"gtid");
if (tmp)
{
m_gtid_pos = std::string(tmp);
}
}
if (m_wait_gtid_state == EXPECTING_WAIT_GTID_RESULT)
{
writebuf = discard_master_wait_gtid_result(writebuf);
}
if (writebuf && m_wait_gtid_state == EXPECTING_REAL_RESULT)
{
correct_packet_sequence(writebuf);
}
}
if (m_wait_gtid_state == EXPECTING_WAIT_GTID_RESULT)
{
if ((writebuf = discard_master_wait_gtid_result(writebuf)) == NULL)
{
rval = false;
}
}
if (rval && m_wait_gtid_state == EXPECTING_REAL_RESULT)
{
correct_packet_sequence(writebuf);
}
return rval;
return writebuf;
}
void RWSplitSession::clientReply(GWBUF *writebuf, DCB *backend_dcb)
@ -369,7 +361,7 @@ void RWSplitSession::clientReply(GWBUF *writebuf, DCB *backend_dcb)
SRWBackend& backend = get_backend_from_dcb(backend_dcb);
if (!handle_causal_read_reply(writebuf, backend))
if ((writebuf = handle_causal_read_reply(writebuf, backend)) == NULL)
{
return; // Nothing to route, return
}

2
server/modules/routing/readwritesplit/rwsplitsession.hh
View File

@ -161,7 +161,7 @@ private:
void log_master_routing_failure(bool found, mxs::SRWBackend& old_master,
mxs::SRWBackend& curr_master);
bool handle_causal_read_reply(GWBUF *writebuf, mxs::SRWBackend& backend);
GWBUF* handle_causal_read_reply(GWBUF *writebuf, mxs::SRWBackend& backend);
GWBUF* add_prefix_wait_gtid(SERVER *server, GWBUF *origin);
void correct_packet_sequence(GWBUF *buffer);
GWBUF* discard_master_wait_gtid_result(GWBUF *buffer);