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
|
/* Copyright (C) 2006 MySQL AB
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 St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "mysql_priv.h"
#include "rpl_injector.h"
/*
injector::transaction - member definitions
*/
/* inline since it's called below */
inline
injector::transaction::transaction(MYSQL_BIN_LOG *log, THD *thd)
: m_state(START_STATE), m_thd(thd)
{
/*
Default initialization of m_start_pos (which initializes it to garbage).
We need to fill it in using the code below.
*/
LOG_INFO log_info;
log->get_current_log(&log_info);
/* !!! binlog_pos does not follow RAII !!! */
m_start_pos.m_file_name= my_strdup(log_info.log_file_name, MYF(0));
m_start_pos.m_file_pos= log_info.pos;
m_thd->lex->start_transaction_opt= 0; /* for begin_trans() */
begin_trans(m_thd);
thd->set_current_stmt_binlog_row_based();
}
injector::transaction::~transaction()
{
if (!good())
return;
/* Needed since my_free expects a 'char*' (instead of 'void*'). */
char* const the_memory= const_cast<char*>(m_start_pos.m_file_name);
/*
We set the first character to null just to give all the copies of the
start position a (minimal) chance of seening that the memory is lost.
All assuming the my_free does not step over the memory, of course.
*/
*the_memory= '\0';
my_free(the_memory, MYF(0));
}
/**
@retval 0 transaction committed
@retval 1 transaction rolled back
*/
int injector::transaction::commit()
{
DBUG_ENTER("injector::transaction::commit()");
int error= m_thd->binlog_flush_pending_rows_event(true);
/*
Cluster replication does not preserve statement or
transaction boundaries of the master. Instead, a new
transaction on replication slave is started when a new GCI
(global checkpoint identifier) is issued, and is committed
when the last event of the check point has been received and
processed. This ensures consistency of each cluster in
cluster replication, and there is no requirement for stronger
consistency: MySQL replication is asynchronous with other
engines as well.
A practical consequence of that is that row level replication
stream passed through the injector thread never contains
COMMIT events.
Here we should preserve the server invariant that there is no
outstanding statement transaction when the normal transaction
is committed by committing the statement transaction
explicitly.
*/
error |= ha_autocommit_or_rollback(m_thd, error);
end_trans(m_thd, error ? ROLLBACK : COMMIT);
DBUG_RETURN(error);
}
int injector::transaction::use_table(server_id_type sid, table tbl)
{
DBUG_ENTER("injector::transaction::use_table");
int error;
if ((error= check_state(TABLE_STATE)))
DBUG_RETURN(error);
server_id_type save_id= m_thd->server_id;
m_thd->set_server_id(sid);
error= m_thd->binlog_write_table_map(tbl.get_table(),
tbl.is_transactional());
m_thd->set_server_id(save_id);
DBUG_RETURN(error);
}
int injector::transaction::write_row (server_id_type sid, table tbl,
MY_BITMAP const* cols, size_t colcnt,
record_type record)
{
DBUG_ENTER("injector::transaction::write_row(...)");
int error= check_state(ROW_STATE);
if (error)
DBUG_RETURN(error);
server_id_type save_id= m_thd->server_id;
m_thd->set_server_id(sid);
error= m_thd->binlog_write_row(tbl.get_table(), tbl.is_transactional(),
cols, colcnt, record);
m_thd->set_server_id(save_id);
DBUG_RETURN(error);
}
int injector::transaction::delete_row(server_id_type sid, table tbl,
MY_BITMAP const* cols, size_t colcnt,
record_type record)
{
DBUG_ENTER("injector::transaction::delete_row(...)");
int error= check_state(ROW_STATE);
if (error)
DBUG_RETURN(error);
server_id_type save_id= m_thd->server_id;
m_thd->set_server_id(sid);
error= m_thd->binlog_delete_row(tbl.get_table(), tbl.is_transactional(),
cols, colcnt, record);
m_thd->set_server_id(save_id);
DBUG_RETURN(error);
}
int injector::transaction::update_row(server_id_type sid, table tbl,
MY_BITMAP const* cols, size_t colcnt,
record_type before, record_type after)
{
DBUG_ENTER("injector::transaction::update_row(...)");
int error= check_state(ROW_STATE);
if (error)
DBUG_RETURN(error);
server_id_type save_id= m_thd->server_id;
m_thd->set_server_id(sid);
error= m_thd->binlog_update_row(tbl.get_table(), tbl.is_transactional(),
cols, colcnt, before, after);
m_thd->set_server_id(save_id);
DBUG_RETURN(error);
}
injector::transaction::binlog_pos injector::transaction::start_pos() const
{
return m_start_pos;
}
/*
injector - member definitions
*/
/* This constructor is called below */
inline injector::injector()
{
}
static injector *s_injector= 0;
injector *injector::instance()
{
if (s_injector == 0)
s_injector= new injector;
/* "There can be only one [instance]" */
return s_injector;
}
void injector::free_instance()
{
injector *inj = s_injector;
if (inj != 0)
{
s_injector= 0;
delete inj;
}
}
injector::transaction injector::new_trans(THD *thd)
{
DBUG_ENTER("injector::new_trans(THD*)");
/*
Currently, there is no alternative to using 'mysql_bin_log' since that
is hardcoded into the way the handler is using the binary log.
*/
DBUG_RETURN(transaction(&mysql_bin_log, thd));
}
void injector::new_trans(THD *thd, injector::transaction *ptr)
{
DBUG_ENTER("injector::new_trans(THD *, transaction *)");
/*
Currently, there is no alternative to using 'mysql_bin_log' since that
is hardcoded into the way the handler is using the binary log.
*/
transaction trans(&mysql_bin_log, thd);
ptr->swap(trans);
DBUG_VOID_RETURN;
}
int injector::record_incident(THD *thd, Incident incident)
{
Incident_log_event ev(thd, incident);
if (int error= mysql_bin_log.write(&ev))
return error;
mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
return 0;
}
int injector::record_incident(THD *thd, Incident incident, LEX_STRING const message)
{
Incident_log_event ev(thd, incident, message);
if (int error= mysql_bin_log.write(&ev))
return error;
mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
return 0;
}
|
