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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 02111-1301 USA
*/
//! @file some utility functions and classes not directly related to replication
#include "mariadb.h"
#include "wsrep_xid.h"
#include "sql_class.h"
#include "wsrep_mysqld.h" // for logging macros
#include <mysql/service_wsrep.h>
#include <algorithm> /* std::sort() */
/*
* WSREPXid
*/
#define WSREP_XID_PREFIX "WSREPXi"
#define WSREP_XID_PREFIX_LEN 7
#define WSREP_XID_VERSION_OFFSET WSREP_XID_PREFIX_LEN
#define WSREP_XID_VERSION_1 'd'
#define WSREP_XID_VERSION_2 'e'
#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::gtid& wsgtid)
{
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);
xid->data[WSREP_XID_VERSION_OFFSET]= WSREP_XID_VERSION_2;
memcpy(xid->data + WSREP_XID_UUID_OFFSET, wsgtid.id().data(),sizeof(wsrep::id));
int8store(xid->data + WSREP_XID_SEQNO_OFFSET, wsgtid.seqno().get());
}
extern "C"
int wsrep_is_wsrep_xid(const void* xid_ptr)
{
const XID* xid= static_cast<const XID*>(xid_ptr);
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) &&
(xid->data[WSREP_XID_VERSION_OFFSET] == WSREP_XID_VERSION_1 ||
xid->data[WSREP_XID_VERSION_OFFSET] == WSREP_XID_VERSION_2));
}
const unsigned char* wsrep_xid_uuid(const xid_t* xid)
{
DBUG_ASSERT(xid);
static wsrep::id const undefined;
if (wsrep_is_wsrep_xid(xid))
return reinterpret_cast<const unsigned char*>
(xid->data + WSREP_XID_UUID_OFFSET);
else
return static_cast<const unsigned char*>(wsrep::id::undefined().data());
}
const wsrep::id& wsrep_xid_uuid(const XID& xid)
{
compile_time_assert(sizeof(wsrep::id) == sizeof(wsrep_uuid_t));
return *reinterpret_cast<const wsrep::id*>(wsrep_xid_uuid(&xid));
}
long long wsrep_xid_seqno(const xid_t* xid)
{
DBUG_ASSERT(xid);
long long ret= wsrep::seqno::undefined().get();
if (wsrep_is_wsrep_xid(xid))
{
switch (xid->data[WSREP_XID_VERSION_OFFSET])
{
case WSREP_XID_VERSION_1:
memcpy(&ret, xid->data + WSREP_XID_SEQNO_OFFSET, sizeof ret);
break;
case WSREP_XID_VERSION_2:
ret= sint8korr(xid->data + WSREP_XID_SEQNO_OFFSET);
break;
default:
break;
}
}
return ret;
}
wsrep::seqno wsrep_xid_seqno(const XID& xid)
{
return wsrep::seqno(wsrep_xid_seqno(&xid));
}
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 unsigned char* uuid= wsrep_xid_uuid(xid);
char uuid_str[40]= {0, };
wsrep_uuid_print((const wsrep_uuid_t*)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::gtid& wsgtid)
{
XID xid;
wsrep_xid_init(&xid, wsgtid);
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);
wsrep_uuid_t uuid;
memcpy(&uuid, wsrep_xid_uuid(xid), sizeof(uuid));
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);
}
wsrep::gtid wsrep_get_SE_checkpoint()
{
XID xid;
xid.null();
if (wsrep_get_SE_checkpoint(xid))
{
return wsrep::gtid();
}
if (xid.is_null())
{
return wsrep::gtid();
}
if (!wsrep_is_wsrep_xid(&xid))
{
WSREP_WARN("Read non-wsrep XID from storage engines.");
return wsrep::gtid();
}
return wsrep::gtid(wsrep_xid_uuid(xid),wsrep_xid_seqno(xid));
}
/*
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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