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/* Copyright 2015 Codership Oy <http://www.codership.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*/
//! @file some utility functions and classes not directly related to replication
#include "wsrep_xid.h"
#include "sql_class.h"
#include "wsrep_mysqld.h" // for logging macros
#include <algorithm> /* std::sort() */
/*
* WSREPXid
*/
#define WSREP_XID_PREFIX "WSREPXid"
#define WSREP_XID_PREFIX_LEN MYSQL_XID_PREFIX_LEN
#define WSREP_XID_UUID_OFFSET 8
#define WSREP_XID_SEQNO_OFFSET (WSREP_XID_UUID_OFFSET + sizeof(wsrep_uuid_t))
#define WSREP_XID_GTRID_LEN (WSREP_XID_SEQNO_OFFSET + sizeof(wsrep_seqno_t))
void wsrep_xid_init(XID* xid, const wsrep_uuid_t& uuid, wsrep_seqno_t seqno)
{
xid->formatID= 1;
xid->gtrid_length= WSREP_XID_GTRID_LEN;
xid->bqual_length= 0;
memset(xid->data, 0, sizeof(xid->data));
memcpy(xid->data, WSREP_XID_PREFIX, WSREP_XID_PREFIX_LEN);
memcpy(xid->data + WSREP_XID_UUID_OFFSET, &uuid, sizeof(wsrep_uuid_t));
memcpy(xid->data + WSREP_XID_SEQNO_OFFSET, &seqno, sizeof(wsrep_seqno_t));
}
int wsrep_is_wsrep_xid(const XID* xid)
{
return (xid->formatID == 1 &&
xid->gtrid_length == WSREP_XID_GTRID_LEN &&
xid->bqual_length == 0 &&
!memcmp(xid->data, WSREP_XID_PREFIX, WSREP_XID_PREFIX_LEN));
}
const wsrep_uuid_t* wsrep_xid_uuid(const XID& xid)
{
if (wsrep_is_wsrep_xid(&xid))
return reinterpret_cast<const wsrep_uuid_t*>(xid.data
+ WSREP_XID_UUID_OFFSET);
else
return &WSREP_UUID_UNDEFINED;
}
wsrep_seqno_t wsrep_xid_seqno(const XID& xid)
{
if (wsrep_is_wsrep_xid(&xid))
{
wsrep_seqno_t seqno;
memcpy(&seqno, xid.data + WSREP_XID_SEQNO_OFFSET, sizeof(wsrep_seqno_t));
return seqno;
}
else
{
return WSREP_SEQNO_UNDEFINED;
}
}
static my_bool set_SE_checkpoint(THD* unused, plugin_ref plugin, void* arg)
{
XID* xid= static_cast<XID*>(arg);
handlerton* hton= plugin_data(plugin, handlerton *);
if (hton->set_checkpoint)
{
const wsrep_uuid_t* uuid(wsrep_xid_uuid(*xid));
char uuid_str[40] = {0, };
wsrep_uuid_print(uuid, uuid_str, sizeof(uuid_str));
WSREP_DEBUG("Set WSREPXid for InnoDB: %s:%lld",
uuid_str, (long long)wsrep_xid_seqno(*xid));
hton->set_checkpoint(hton, xid);
}
return FALSE;
}
bool wsrep_set_SE_checkpoint(XID& xid)
{
return plugin_foreach(NULL, set_SE_checkpoint, MYSQL_STORAGE_ENGINE_PLUGIN,
&xid);
}
bool wsrep_set_SE_checkpoint(const wsrep_uuid_t& uuid, wsrep_seqno_t seqno)
{
XID xid;
wsrep_xid_init(&xid, uuid, seqno);
return wsrep_set_SE_checkpoint(xid);
}
static my_bool get_SE_checkpoint(THD* unused, plugin_ref plugin, void* arg)
{
XID* xid= reinterpret_cast<XID*>(arg);
handlerton* hton= plugin_data(plugin, handlerton *);
if (hton->get_checkpoint)
{
hton->get_checkpoint(hton, xid);
const wsrep_uuid_t* uuid(wsrep_xid_uuid(*xid));
char uuid_str[40] = {0, };
wsrep_uuid_print(uuid, uuid_str, sizeof(uuid_str));
WSREP_DEBUG("Read WSREPXid from InnoDB: %s:%lld",
uuid_str, (long long)wsrep_xid_seqno(*xid));
}
return FALSE;
}
bool wsrep_get_SE_checkpoint(XID& xid)
{
return plugin_foreach(NULL, get_SE_checkpoint, MYSQL_STORAGE_ENGINE_PLUGIN,
&xid);
}
bool wsrep_get_SE_checkpoint(wsrep_uuid_t& uuid, wsrep_seqno_t& seqno)
{
uuid= WSREP_UUID_UNDEFINED;
seqno= WSREP_SEQNO_UNDEFINED;
XID xid;
xid.null();
if (wsrep_get_SE_checkpoint(xid))
{
return true;
}
if (xid.is_null())
{
return false;
}
if (!wsrep_is_wsrep_xid(&xid))
{
WSREP_WARN("Read non-wsrep XID from storage engines.");
return false;
}
uuid= *wsrep_xid_uuid(xid);
seqno= wsrep_xid_seqno(xid);
return false;
}
/*
Sort order for XIDs. Wsrep XIDs are sorted according to
seqno in ascending order. Non-wsrep XIDs are considered
equal among themselves and greater than with respect
to wsrep XIDs.
*/
struct Wsrep_xid_cmp
{
bool operator()(const XID& left, const XID& right) const
{
const bool left_is_wsrep= wsrep_is_wsrep_xid(&left);
const bool right_is_wsrep= wsrep_is_wsrep_xid(&right);
if (left_is_wsrep && right_is_wsrep)
{
return (wsrep_xid_seqno(left) < wsrep_xid_seqno(right));
}
else if (left_is_wsrep)
{
return true;
}
else
{
return false;
}
}
};
void wsrep_sort_xid_array(XID *array, int len)
{
std::sort(array, array + len, Wsrep_xid_cmp());
}
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