summaryrefslogtreecommitdiffstats
path: root/sql/wsrep_xid.cc
blob: 34eafe9c46cce15b5fe2c09fd9f84f0a077a10a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/* 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 "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_VERSION_3 'f'
#define WSREP_XID_UUID_OFFSET 8
#define WSREP_XID_SEQNO_OFFSET (WSREP_XID_UUID_OFFSET + sizeof(wsrep_uuid_t))
#define WSREP_XID_GTRID_LEN_V_1_2 (WSREP_XID_SEQNO_OFFSET + sizeof(wsrep_seqno_t))
#define WSREP_XID_RPL_GTID_OFFSET (WSREP_XID_SEQNO_OFFSET + sizeof(wsrep_seqno_t))
#define WSREP_XID_GTRID_LEN_V_3 (WSREP_XID_RPL_GTID_OFFSET + sizeof(wsrep_server_gtid_t))

void wsrep_xid_init(XID* xid, const wsrep::gtid& wsgtid, const wsrep_server_gtid_t& gtid)
{
  xid->formatID= 1;
  xid->gtrid_length= WSREP_XID_GTRID_LEN_V_3;
  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_3;
  memcpy(xid->data + WSREP_XID_UUID_OFFSET,  wsgtid.id().data(),sizeof(wsrep::id));
  int8store(xid->data + WSREP_XID_SEQNO_OFFSET, wsgtid.seqno().get());
  memcpy(xid->data + WSREP_XID_RPL_GTID_OFFSET, &gtid, sizeof(wsrep_server_gtid_t));
}

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->bqual_length  == 0                   &&
          xid->gtrid_length  >= static_cast<long>(WSREP_XID_GTRID_LEN_V_1_2) &&
          !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)  &&
            xid->gtrid_length  == WSREP_XID_GTRID_LEN_V_1_2)              ||
           (xid->data[WSREP_XID_VERSION_OFFSET] == WSREP_XID_VERSION_3    &&
            xid->gtrid_length  == WSREP_XID_GTRID_LEN_V_3)));
}

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:
    case WSREP_XID_VERSION_3:
      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, const wsrep_server_gtid_t& gtid)
{
  XID xid;
  wsrep_xid_init(&xid, wsgtid, gtid);
  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);
}

static bool wsrep_get_SE_checkpoint_common(XID& xid)
{
  xid.null();

  if (wsrep_get_SE_checkpoint(xid))
  {
    return FALSE;
  }

  if (xid.is_null())
  {
    return FALSE;
  }

  if (!wsrep_is_wsrep_xid(&xid))
  {
    WSREP_WARN("Read non-wsrep XID from storage engines.");
    return FALSE;
  }

  return TRUE;
}

template<>
wsrep::gtid wsrep_get_SE_checkpoint()
{
  XID xid;

  if (!wsrep_get_SE_checkpoint_common(xid))
  {
    return wsrep::gtid();
  }

  return wsrep::gtid(wsrep_xid_uuid(xid),wsrep_xid_seqno(xid));
}

template<>
wsrep_server_gtid_t wsrep_get_SE_checkpoint()
{
  XID xid;
  wsrep_server_gtid_t gtid= {0,0,0};

  if (!wsrep_get_SE_checkpoint_common(xid))
  {
    return gtid;
  }

  if (xid.data[WSREP_XID_VERSION_OFFSET] == WSREP_XID_VERSION_3)
  {
    memcpy(&gtid, &xid.data[WSREP_XID_RPL_GTID_OFFSET], sizeof(wsrep_server_gtid_t));
  }

  return gtid;
}

/*
  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());
}