/
log_event_server.cc
8206 lines (7161 loc) · 262 KB
/
log_event_server.cc
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/*
Copyright (c) 2000, 2019, Oracle and/or its affiliates.
Copyright (c) 2009, 2022, MariaDB
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 02110-1335 USA */
#include "mariadb.h"
#include "sql_priv.h"
#ifdef MYSQL_CLIENT
#error MYSQL_CLIENT must not be defined here
#endif
#ifndef MYSQL_SERVER
#error MYSQL_SERVER must be defined here
#endif
#include "unireg.h"
#include "log_event.h"
#include "sql_base.h" // close_thread_tables
#include "sql_cache.h" // QUERY_CACHE_FLAGS_SIZE
#include "sql_locale.h" // MY_LOCALE, my_locale_by_number, my_locale_en_US
#include "key.h" // key_copy
#include "lock.h" // mysql_unlock_tables
#include "sql_parse.h" // mysql_test_parse_for_slave
#include "tztime.h" // struct Time_zone
#include "sql_load.h" // mysql_load
#include "sql_db.h" // load_db_opt_by_name
#include "slave.h"
#include "rpl_rli.h"
#include "rpl_mi.h"
#include "rpl_filter.h"
#include "rpl_record.h"
#include "transaction.h"
#include <my_dir.h>
#include "sql_show.h" // append_identifier
#include "debug_sync.h" // debug_sync
#include <mysql/psi/mysql_statement.h>
#include <strfunc.h>
#include "compat56.h"
#include "wsrep_mysqld.h"
#include "sql_insert.h"
#include "sql_table.h"
#include <mysql/service_wsrep.h>
#include <my_bitmap.h>
#include "rpl_utility.h"
#include "rpl_constants.h"
#include "sql_digest.h"
#include "zlib.h"
#define log_cs &my_charset_latin1
#if defined(HAVE_REPLICATION)
static int rows_event_stmt_cleanup(rpl_group_info *rgi, THD* thd);
static const char *HA_ERR(int i)
{
/*
This function should only be called in case of an error
was detected
*/
DBUG_ASSERT(i != 0);
switch (i) {
case HA_ERR_KEY_NOT_FOUND: return "HA_ERR_KEY_NOT_FOUND";
case HA_ERR_FOUND_DUPP_KEY: return "HA_ERR_FOUND_DUPP_KEY";
case HA_ERR_RECORD_CHANGED: return "HA_ERR_RECORD_CHANGED";
case HA_ERR_WRONG_INDEX: return "HA_ERR_WRONG_INDEX";
case HA_ERR_CRASHED: return "HA_ERR_CRASHED";
case HA_ERR_WRONG_IN_RECORD: return "HA_ERR_WRONG_IN_RECORD";
case HA_ERR_OUT_OF_MEM: return "HA_ERR_OUT_OF_MEM";
case HA_ERR_NOT_A_TABLE: return "HA_ERR_NOT_A_TABLE";
case HA_ERR_WRONG_COMMAND: return "HA_ERR_WRONG_COMMAND";
case HA_ERR_OLD_FILE: return "HA_ERR_OLD_FILE";
case HA_ERR_NO_ACTIVE_RECORD: return "HA_ERR_NO_ACTIVE_RECORD";
case HA_ERR_RECORD_DELETED: return "HA_ERR_RECORD_DELETED";
case HA_ERR_RECORD_FILE_FULL: return "HA_ERR_RECORD_FILE_FULL";
case HA_ERR_INDEX_FILE_FULL: return "HA_ERR_INDEX_FILE_FULL";
case HA_ERR_END_OF_FILE: return "HA_ERR_END_OF_FILE";
case HA_ERR_UNSUPPORTED: return "HA_ERR_UNSUPPORTED";
case HA_ERR_TO_BIG_ROW: return "HA_ERR_TO_BIG_ROW";
case HA_WRONG_CREATE_OPTION: return "HA_WRONG_CREATE_OPTION";
case HA_ERR_FOUND_DUPP_UNIQUE: return "HA_ERR_FOUND_DUPP_UNIQUE";
case HA_ERR_UNKNOWN_CHARSET: return "HA_ERR_UNKNOWN_CHARSET";
case HA_ERR_WRONG_MRG_TABLE_DEF: return "HA_ERR_WRONG_MRG_TABLE_DEF";
case HA_ERR_CRASHED_ON_REPAIR: return "HA_ERR_CRASHED_ON_REPAIR";
case HA_ERR_CRASHED_ON_USAGE: return "HA_ERR_CRASHED_ON_USAGE";
case HA_ERR_LOCK_WAIT_TIMEOUT: return "HA_ERR_LOCK_WAIT_TIMEOUT";
case HA_ERR_LOCK_TABLE_FULL: return "HA_ERR_LOCK_TABLE_FULL";
case HA_ERR_READ_ONLY_TRANSACTION: return "HA_ERR_READ_ONLY_TRANSACTION";
case HA_ERR_LOCK_DEADLOCK: return "HA_ERR_LOCK_DEADLOCK";
case HA_ERR_CANNOT_ADD_FOREIGN: return "HA_ERR_CANNOT_ADD_FOREIGN";
case HA_ERR_NO_REFERENCED_ROW: return "HA_ERR_NO_REFERENCED_ROW";
case HA_ERR_ROW_IS_REFERENCED: return "HA_ERR_ROW_IS_REFERENCED";
case HA_ERR_NO_SAVEPOINT: return "HA_ERR_NO_SAVEPOINT";
case HA_ERR_NON_UNIQUE_BLOCK_SIZE: return "HA_ERR_NON_UNIQUE_BLOCK_SIZE";
case HA_ERR_NO_SUCH_TABLE: return "HA_ERR_NO_SUCH_TABLE";
case HA_ERR_TABLE_EXIST: return "HA_ERR_TABLE_EXIST";
case HA_ERR_NO_CONNECTION: return "HA_ERR_NO_CONNECTION";
case HA_ERR_NULL_IN_SPATIAL: return "HA_ERR_NULL_IN_SPATIAL";
case HA_ERR_TABLE_DEF_CHANGED: return "HA_ERR_TABLE_DEF_CHANGED";
case HA_ERR_NO_PARTITION_FOUND: return "HA_ERR_NO_PARTITION_FOUND";
case HA_ERR_RBR_LOGGING_FAILED: return "HA_ERR_RBR_LOGGING_FAILED";
case HA_ERR_DROP_INDEX_FK: return "HA_ERR_DROP_INDEX_FK";
case HA_ERR_FOREIGN_DUPLICATE_KEY: return "HA_ERR_FOREIGN_DUPLICATE_KEY";
case HA_ERR_TABLE_NEEDS_UPGRADE: return "HA_ERR_TABLE_NEEDS_UPGRADE";
case HA_ERR_TABLE_READONLY: return "HA_ERR_TABLE_READONLY";
case HA_ERR_AUTOINC_READ_FAILED: return "HA_ERR_AUTOINC_READ_FAILED";
case HA_ERR_AUTOINC_ERANGE: return "HA_ERR_AUTOINC_ERANGE";
case HA_ERR_GENERIC: return "HA_ERR_GENERIC";
case HA_ERR_RECORD_IS_THE_SAME: return "HA_ERR_RECORD_IS_THE_SAME";
case HA_ERR_LOGGING_IMPOSSIBLE: return "HA_ERR_LOGGING_IMPOSSIBLE";
case HA_ERR_CORRUPT_EVENT: return "HA_ERR_CORRUPT_EVENT";
case HA_ERR_ROWS_EVENT_APPLY : return "HA_ERR_ROWS_EVENT_APPLY";
case HA_ERR_PARTITION_LIST : return "HA_ERR_PARTITION_LIST";
}
return "No Error!";
}
/*
Return true if an error caught during event execution is a temporary error
that will cause automatic retry of the event group during parallel
replication, false otherwise.
In parallel replication, conflicting transactions can occasionally cause
deadlocks; such errors are handled automatically by rolling back re-trying
the transactions, so should not pollute the error log.
*/
bool
is_parallel_retry_error(rpl_group_info *rgi, int err)
{
if (!rgi->is_parallel_exec)
return false;
if (rgi->speculation == rpl_group_info::SPECULATE_OPTIMISTIC)
return true;
if (rgi->killed_for_retry &&
(err == ER_QUERY_INTERRUPTED || err == ER_CONNECTION_KILLED))
return true;
return has_temporary_error(rgi->thd);
}
/**
Accumulate a Diagnostics_area's errors and warnings into an output buffer
@param errbuf The output buffer to write error messages
@param errbuf_size The size of the output buffer
@param da The Diagnostics_area to check for errors
*/
static void inline aggregate_da_errors(char *errbuf, size_t errbuf_size,
Diagnostics_area *da)
{
const char *errbuf_end= errbuf + errbuf_size;
char *slider;
Diagnostics_area::Sql_condition_iterator it= da->sql_conditions();
const Sql_condition *err;
size_t len;
for (err= it++, slider= errbuf; err && slider < errbuf_end - 1;
slider += len, err= it++)
{
len= my_snprintf(slider, errbuf_end - slider,
" %s, Error_code: %d;", err->get_message_text(),
err->get_sql_errno());
}
}
/**
Error reporting facility for Rows_log_event::do_apply_event
@param level error, warning or info
@param ha_error HA_ERR_ code
@param rli pointer to the active Relay_log_info instance
@param thd pointer to the slave thread's thd
@param table pointer to the event's table object
@param type the type of the event
@param log_name the master binlog file name
@param pos the master binlog file pos (the next after the event)
*/
static void inline slave_rows_error_report(enum loglevel level, int ha_error,
rpl_group_info *rgi, THD *thd,
TABLE *table, const char * type,
const char *log_name, my_off_t pos)
{
const char *handler_error= (ha_error ? HA_ERR(ha_error) : NULL);
char buff[MAX_SLAVE_ERRMSG];
Relay_log_info const *rli= rgi->rli;
buff[0]= 0;
int errcode= thd->is_error() ? thd->get_stmt_da()->sql_errno() : 0;
/*
In parallel replication, deadlocks or other temporary errors can happen
occasionally in normal operation, they will be handled correctly and
automatically by re-trying the transactions. So do not pollute the error
log with messages about them.
*/
if (is_parallel_retry_error(rgi, errcode))
return;
aggregate_da_errors(buff, sizeof(buff), thd->get_stmt_da());
if (ha_error != 0 && !thd->killed)
rli->report(level, errcode, rgi->gtid_info(),
"Could not execute %s event on table %s.%s;"
"%s handler error %s; "
"the event's master log %s, end_log_pos %llu",
type, table->s->db.str, table->s->table_name.str,
buff, handler_error == NULL ? "<unknown>" : handler_error,
log_name, pos);
else
rli->report(level, errcode, rgi->gtid_info(),
"Could not execute %s event on table %s.%s;"
"%s the event's master log %s, end_log_pos %llu",
type, table->s->db.str, table->s->table_name.str,
buff, log_name, pos);
}
#endif
#if defined(HAVE_REPLICATION)
static void set_thd_db(THD *thd, Rpl_filter *rpl_filter,
const char *db, uint32 db_len)
{
char lcase_db_buf[NAME_LEN +1];
LEX_CSTRING new_db;
new_db.length= db_len;
if (lower_case_table_names == 1)
{
strmov(lcase_db_buf, db);
my_casedn_str(system_charset_info, lcase_db_buf);
new_db.str= lcase_db_buf;
}
else
new_db.str= db;
/* TODO WARNING this makes rewrite_db respect lower_case_table_names values
* for more info look MDEV-17446 */
new_db.str= rpl_filter->get_rewrite_db(new_db.str, &new_db.length);
thd->set_db(&new_db);
}
#endif
#if defined(HAVE_REPLICATION)
inline int idempotent_error_code(int err_code)
{
int ret= 0;
switch (err_code)
{
case 0:
ret= 1;
break;
/*
The following list of "idempotent" errors
means that an error from the list might happen
because of idempotent (more than once)
applying of a binlog file.
Notice, that binlog has a ddl operation its
second applying may cause
case HA_ERR_TABLE_DEF_CHANGED:
case HA_ERR_CANNOT_ADD_FOREIGN:
which are not included into to the list.
Note that HA_ERR_RECORD_DELETED is not in the list since
do_exec_row() should not return that error code.
*/
case HA_ERR_RECORD_CHANGED:
case HA_ERR_KEY_NOT_FOUND:
case HA_ERR_END_OF_FILE:
case HA_ERR_FOUND_DUPP_KEY:
case HA_ERR_FOUND_DUPP_UNIQUE:
case HA_ERR_FOREIGN_DUPLICATE_KEY:
case HA_ERR_NO_REFERENCED_ROW:
case HA_ERR_ROW_IS_REFERENCED:
ret= 1;
break;
default:
ret= 0;
break;
}
return (ret);
}
/**
Ignore error code specified on command line.
*/
inline int ignored_error_code(int err_code)
{
if (use_slave_mask && bitmap_is_set(&slave_error_mask, err_code))
{
statistic_increment(slave_skipped_errors, LOCK_status);
return 1;
}
return err_code == ER_SLAVE_IGNORED_TABLE;
}
/*
This function converts an engine's error to a server error.
If the thread does not have an error already reported, it tries to
define it by calling the engine's method print_error. However, if a
mapping is not found, it uses the ER_UNKNOWN_ERROR and prints out a
warning message.
*/
int convert_handler_error(int error, THD* thd, TABLE *table)
{
uint actual_error= (thd->is_error() ? thd->get_stmt_da()->sql_errno() :
0);
if (actual_error == 0)
{
table->file->print_error(error, MYF(0));
actual_error= (thd->is_error() ? thd->get_stmt_da()->sql_errno() :
ER_UNKNOWN_ERROR);
if (actual_error == ER_UNKNOWN_ERROR)
if (global_system_variables.log_warnings)
sql_print_warning("Unknown error detected %d in handler", error);
}
return (actual_error);
}
inline bool concurrency_error_code(int error)
{
switch (error)
{
case ER_LOCK_WAIT_TIMEOUT:
case ER_LOCK_DEADLOCK:
case ER_XA_RBDEADLOCK:
return TRUE;
default:
return (FALSE);
}
}
inline bool unexpected_error_code(int unexpected_error)
{
switch (unexpected_error)
{
case ER_NET_READ_ERROR:
case ER_NET_ERROR_ON_WRITE:
case ER_QUERY_INTERRUPTED:
case ER_STATEMENT_TIMEOUT:
case ER_CONNECTION_KILLED:
case ER_SERVER_SHUTDOWN:
case ER_NEW_ABORTING_CONNECTION:
return(TRUE);
default:
return(FALSE);
}
}
/**
Create a prefix for the temporary files that is to be used for
load data file name for this master
@param name Store prefix of name here
@param connection_name Connection name
@return pointer to end of name
@description
We assume that FN_REFLEN is big enough to hold
MAX_CONNECTION_NAME * MAX_FILENAME_MBWIDTH characters + 2 numbers +
a short extension.
The resulting file name has the following parts, each separated with a '-'
- PREFIX_SQL_LOAD (SQL_LOAD-)
- If a connection name is given (multi-master setup):
- Add an extra '-' to mark that this is a multi-master file
- connection name in lower case, converted to safe file characters.
(see create_logfile_name_with_suffix()).
- server_id
- A last '-' (after server_id).
*/
static char *load_data_tmp_prefix(char *name,
LEX_CSTRING *connection_name)
{
name= strmov(name, PREFIX_SQL_LOAD);
if (connection_name->length)
{
uint buf_length;
uint errors;
/* Add marker that this is a multi-master-file */
*name++='-';
/* Convert connection_name to a safe filename */
buf_length= strconvert(system_charset_info, connection_name->str, FN_REFLEN,
&my_charset_filename, name, FN_REFLEN, &errors);
name+= buf_length;
*name++= '-';
}
name= int10_to_str(global_system_variables.server_id, name, 10);
*name++ = '-';
*name= '\0'; // For testing prefixes
return name;
}
/**
Creates a temporary name for LOAD DATA INFILE
@param buf Store new filename here
@param file_id File_id (part of file name)
@param event_server_id Event_id (part of file name)
@param ext Extension for file name
@return
Pointer to start of extension
*/
static char *slave_load_file_stem(char *buf, uint file_id,
int event_server_id, const char *ext,
LEX_CSTRING *connection_name)
{
char *res;
res= buf+ unpack_dirname(buf, slave_load_tmpdir);
to_unix_path(buf);
buf= load_data_tmp_prefix(res, connection_name);
buf= int10_to_str(event_server_id, buf, 10);
*buf++ = '-';
res= int10_to_str(file_id, buf, 10);
strmov(res, ext); // Add extension last
return res; // Pointer to extension
}
#endif
#if defined(HAVE_REPLICATION)
/**
Delete all temporary files used for SQL_LOAD.
*/
static void cleanup_load_tmpdir(LEX_CSTRING *connection_name)
{
MY_DIR *dirp;
FILEINFO *file;
size_t i;
char dir[FN_REFLEN], fname[FN_REFLEN];
char prefbuf[31 + MAX_CONNECTION_NAME* MAX_FILENAME_MBWIDTH + 1];
DBUG_ENTER("cleanup_load_tmpdir");
unpack_dirname(dir, slave_load_tmpdir);
if (!(dirp=my_dir(dir, MYF(MY_WME))))
return;
/*
When we are deleting temporary files, we should only remove
the files associated with the server id of our server.
We don't use event_server_id here because since we've disabled
direct binlogging of Create_file/Append_file/Exec_load events
we cannot meet Start_log event in the middle of events from one
LOAD DATA.
*/
load_data_tmp_prefix(prefbuf, connection_name);
DBUG_PRINT("enter", ("dir: '%s' prefix: '%s'", dir, prefbuf));
for (i=0 ; i < dirp->number_of_files; i++)
{
file=dirp->dir_entry+i;
if (is_prefix(file->name, prefbuf))
{
fn_format(fname,file->name,slave_load_tmpdir,"",MY_UNPACK_FILENAME);
mysql_file_delete(key_file_misc, fname, MYF(0));
}
}
my_dirend(dirp);
DBUG_VOID_RETURN;
}
#endif
/**
Append a version of the 'str' string suitable for use in a query to
the 'to' string. To generate a correct escaping, the character set
information in 'csinfo' is used.
*/
int append_query_string(CHARSET_INFO *csinfo, String *to,
const char *str, size_t len, bool no_backslash)
{
char *beg, *ptr;
my_bool overflow;
uint32 const orig_len= to->length();
if (to->reserve(orig_len + len * 2 + 4))
return 1;
beg= (char*) to->ptr() + to->length();
ptr= beg;
if (csinfo->escape_with_backslash_is_dangerous)
ptr= str_to_hex(ptr, str, len);
else
{
*ptr++= '\'';
if (!no_backslash)
{
ptr+= escape_string_for_mysql(csinfo, ptr, 0, str, len, &overflow);
}
else
{
const char *frm_str= str;
for (; frm_str < (str + len); frm_str++)
{
/* Using '' way to represent "'" */
if (*frm_str == '\'')
*ptr++= *frm_str;
*ptr++= *frm_str;
}
}
*ptr++= '\'';
}
to->length((uint32)(orig_len + ptr - beg));
return 0;
}
/**************************************************************************
Log_event methods (= the parent class of all events)
**************************************************************************/
Log_event::Log_event(THD* thd_arg, uint16 flags_arg, bool using_trans)
:log_pos(0), temp_buf(0), exec_time(0),
slave_exec_mode(SLAVE_EXEC_MODE_STRICT),
checksum_alg(BINLOG_CHECKSUM_ALG_UNDEF), thd(thd_arg)
{
server_id= thd->variables.server_id;
when= thd->start_time;
when_sec_part=thd->start_time_sec_part;
if (using_trans)
cache_type= Log_event::EVENT_TRANSACTIONAL_CACHE;
else
cache_type= Log_event::EVENT_STMT_CACHE;
flags= flags_arg |
(thd->variables.option_bits & OPTION_SKIP_REPLICATION ?
LOG_EVENT_SKIP_REPLICATION_F : 0);
}
/**
This minimal constructor is for when you are not even sure that there
is a valid THD. For example in the server when we are shutting down or
flushing logs after receiving a SIGHUP (then we must write a Rotate to
the binlog but we have no THD, so we need this minimal constructor).
*/
Log_event::Log_event()
:temp_buf(0), exec_time(0), flags(0), cache_type(EVENT_INVALID_CACHE),
slave_exec_mode(SLAVE_EXEC_MODE_STRICT),
checksum_alg(BINLOG_CHECKSUM_ALG_UNDEF), thd(0)
{
server_id= global_system_variables.server_id;
/*
We can't call my_time() here as this would cause a call before
my_init() is called
*/
when= 0;
when_sec_part=0;
log_pos= 0;
}
#ifdef HAVE_REPLICATION
int Log_event::do_update_pos(rpl_group_info *rgi)
{
Relay_log_info *rli= rgi->rli;
DBUG_ENTER("Log_event::do_update_pos");
DBUG_ASSERT(rli);
DBUG_ASSERT(!rli->belongs_to_client());
/*
In parallel execution, delay position update for the events that are
not part of event groups (format description, rotate, and such) until
the actual event execution reaches that point.
*/
if (!rgi->is_parallel_exec || is_group_event(get_type_code()))
rli->stmt_done(log_pos, thd, rgi);
DBUG_RETURN(0); // Cannot fail currently
}
Log_event::enum_skip_reason
Log_event::do_shall_skip(rpl_group_info *rgi)
{
Relay_log_info *rli= rgi->rli;
DBUG_PRINT("info", ("ev->server_id: %lu, ::server_id: %lu,"
" rli->replicate_same_server_id: %d,"
" rli->slave_skip_counter: %llu",
(ulong) server_id,
(ulong) global_system_variables.server_id,
rli->replicate_same_server_id,
rli->slave_skip_counter));
if ((server_id == global_system_variables.server_id &&
!(rli->replicate_same_server_id || (flags & LOG_EVENT_ACCEPT_OWN_F))) ||
(rli->slave_skip_counter == 1 && rli->is_in_group()) ||
(flags & LOG_EVENT_SKIP_REPLICATION_F &&
opt_replicate_events_marked_for_skip != RPL_SKIP_REPLICATE))
return EVENT_SKIP_IGNORE;
if (rli->slave_skip_counter > 0)
return EVENT_SKIP_COUNT;
return EVENT_SKIP_NOT;
}
/*
Log_event::pack_info()
*/
void Log_event::pack_info(Protocol *protocol)
{
protocol->store("", 0, &my_charset_bin);
}
/**
Only called by SHOW BINLOG EVENTS
*/
int Log_event::net_send(Protocol *protocol, const char* log_name, my_off_t pos)
{
const char *p= strrchr(log_name, FN_LIBCHAR);
const char *event_type;
if (p)
log_name = p + 1;
protocol->prepare_for_resend();
protocol->store(log_name, strlen(log_name), &my_charset_bin);
protocol->store((ulonglong) pos);
event_type = get_type_str();
protocol->store(event_type, strlen(event_type), &my_charset_bin);
protocol->store((uint32) server_id);
protocol->store((ulonglong) log_pos);
pack_info(protocol);
return protocol->write();
}
#endif /* HAVE_REPLICATION */
/**
init_show_field_list() prepares the column names and types for the
output of SHOW BINLOG EVENTS; it is used only by SHOW BINLOG
EVENTS.
*/
void Log_event::init_show_field_list(THD *thd, List<Item>* field_list)
{
MEM_ROOT *mem_root= thd->mem_root;
field_list->push_back(new (mem_root)
Item_empty_string(thd, "Log_name", 20),
mem_root);
field_list->push_back(new (mem_root)
Item_return_int(thd, "Pos",
MY_INT64_NUM_DECIMAL_DIGITS,
MYSQL_TYPE_LONGLONG),
mem_root);
field_list->push_back(new (mem_root)
Item_empty_string(thd, "Event_type", 20),
mem_root);
field_list->push_back(new (mem_root)
Item_return_int(thd, "Server_id", 10,
MYSQL_TYPE_LONG),
mem_root);
field_list->push_back(new (mem_root)
Item_return_int(thd, "End_log_pos",
MY_INT64_NUM_DECIMAL_DIGITS,
MYSQL_TYPE_LONGLONG),
mem_root);
field_list->push_back(new (mem_root) Item_empty_string(thd, "Info", 20),
mem_root);
}
/**
A decider of whether to trigger checksum computation or not.
To be invoked in Log_event::write() stack.
The decision is positive
S,M) if it's been marked for checksumming with @c checksum_alg
M) otherwise, if @@global.binlog_checksum is not NONE and the event is
directly written to the binlog file.
The to-be-cached event decides at @c write_cache() time.
Otherwise the decision is negative.
@note A side effect of the method is altering Log_event::checksum_alg
it the latter was undefined at calling.
@return true Checksum should be used. Log_event::checksum_alg is set.
@return false No checksum
*/
my_bool Log_event::need_checksum()
{
my_bool ret;
DBUG_ENTER("Log_event::need_checksum");
/*
few callers of Log_event::write
(incl FD::write, FD constructing code on the slave side, Rotate relay log
and Stop event)
provides their checksum alg preference through Log_event::checksum_alg.
*/
if (checksum_alg != BINLOG_CHECKSUM_ALG_UNDEF)
ret= checksum_alg != BINLOG_CHECKSUM_ALG_OFF;
else
{
ret= binlog_checksum_options && cache_type == Log_event::EVENT_NO_CACHE;
checksum_alg= ret ? (enum_binlog_checksum_alg)binlog_checksum_options
: BINLOG_CHECKSUM_ALG_OFF;
}
/*
FD calls the methods before data_written has been calculated.
The following invariant claims if the current is not the first
call (and therefore data_written is not zero) then `ret' must be
TRUE. It may not be null because FD is always checksummed.
*/
DBUG_ASSERT(get_type_code() != FORMAT_DESCRIPTION_EVENT || ret ||
data_written == 0);
DBUG_ASSERT(!ret ||
((checksum_alg == binlog_checksum_options ||
/*
Stop event closes the relay-log and its checksum alg
preference is set by the caller can be different
from the server's binlog_checksum_options.
*/
get_type_code() == STOP_EVENT ||
/*
Rotate:s can be checksummed regardless of the server's
binlog_checksum_options. That applies to both
the local RL's Rotate and the master's Rotate
which IO thread instantiates via queue_binlog_ver_3_event.
*/
get_type_code() == ROTATE_EVENT ||
get_type_code() == START_ENCRYPTION_EVENT ||
/* FD is always checksummed */
get_type_code() == FORMAT_DESCRIPTION_EVENT) &&
checksum_alg != BINLOG_CHECKSUM_ALG_OFF));
DBUG_ASSERT(checksum_alg != BINLOG_CHECKSUM_ALG_UNDEF);
DBUG_ASSERT(((get_type_code() != ROTATE_EVENT &&
get_type_code() != STOP_EVENT) ||
get_type_code() != FORMAT_DESCRIPTION_EVENT) ||
cache_type == Log_event::EVENT_NO_CACHE);
DBUG_RETURN(ret);
}
int Log_event_writer::write_internal(const uchar *pos, size_t len)
{
DBUG_ASSERT(!ctx || encrypt_or_write == &Log_event_writer::encrypt_and_write);
if (my_b_safe_write(file, pos, len))
{
DBUG_PRINT("error", ("write to log failed: %d", my_errno));
return 1;
}
bytes_written+= len;
return 0;
}
/*
as soon as encryption produces the first output block, write event_len
where it should be in a valid event header
*/
int Log_event_writer::maybe_write_event_len(uchar *pos, size_t len)
{
if (len && event_len)
{
DBUG_ASSERT(len >= EVENT_LEN_OFFSET);
if (write_internal(pos + EVENT_LEN_OFFSET - 4, 4))
return 1;
int4store(pos + EVENT_LEN_OFFSET - 4, event_len);
event_len= 0;
}
return 0;
}
int Log_event_writer::encrypt_and_write(const uchar *pos, size_t len)
{
uchar *dst;
size_t dstsize;
uint dstlen;
int res; // Safe as res is always set
DBUG_ASSERT(ctx);
if (!len)
return 0;
dstsize= encryption_encrypted_length((uint)len, ENCRYPTION_KEY_SYSTEM_DATA,
crypto->key_version);
if (!(dst= (uchar*)my_safe_alloca(dstsize)))
return 1;
if (encryption_ctx_update(ctx, pos, (uint)len, dst, &dstlen))
{
res= 1;
goto err;
}
if (maybe_write_event_len(dst, dstlen))
{
res= 1;
goto err;
}
res= write_internal(dst, dstlen);
err:
my_safe_afree(dst, dstsize);
return res;
}
int Log_event_writer::write_header(uchar *pos, size_t len)
{
DBUG_ENTER("Log_event_writer::write_header");
/*
recording checksum of FD event computed with dropped
possibly active LOG_EVENT_BINLOG_IN_USE_F flag.
Similar step at verication: the active flag is dropped before
checksum computing.
*/
if (checksum_len)
{
uchar save=pos[FLAGS_OFFSET];
pos[FLAGS_OFFSET]&= ~LOG_EVENT_BINLOG_IN_USE_F;
crc= my_checksum(0, pos, len);
pos[FLAGS_OFFSET]= save;
}
if (ctx)
{
uchar iv[BINLOG_IV_LENGTH];
crypto->set_iv(iv, (uint32)my_b_safe_tell(file));
if (encryption_ctx_init(ctx, crypto->key, crypto->key_length,
iv, sizeof(iv), ENCRYPTION_FLAG_ENCRYPT | ENCRYPTION_FLAG_NOPAD,
ENCRYPTION_KEY_SYSTEM_DATA, crypto->key_version))
DBUG_RETURN(1);
DBUG_ASSERT(len >= LOG_EVENT_HEADER_LEN);
event_len= uint4korr(pos + EVENT_LEN_OFFSET);
DBUG_ASSERT(event_len >= len);
memcpy(pos + EVENT_LEN_OFFSET, pos, 4);
pos+= 4;
len-= 4;
}
DBUG_RETURN((this->*encrypt_or_write)(pos, len));
}
int Log_event_writer::write_data(const uchar *pos, size_t len)
{
DBUG_ENTER("Log_event_writer::write_data");
if (checksum_len)
crc= my_checksum(crc, pos, len);
DBUG_RETURN((this->*encrypt_or_write)(pos, len));
}
int Log_event_writer::write_footer()
{
DBUG_ENTER("Log_event_writer::write_footer");
if (checksum_len)
{
uchar checksum_buf[BINLOG_CHECKSUM_LEN];
int4store(checksum_buf, crc);
if ((this->*encrypt_or_write)(checksum_buf, BINLOG_CHECKSUM_LEN))
DBUG_RETURN(ER_ERROR_ON_WRITE);
}
if (ctx)
{
uint dstlen;
uchar dst[MY_AES_BLOCK_SIZE*2];
if (encryption_ctx_finish(ctx, dst, &dstlen))
DBUG_RETURN(1);
if (maybe_write_event_len(dst, dstlen) || write_internal(dst, dstlen))
DBUG_RETURN(ER_ERROR_ON_WRITE);
}
DBUG_RETURN(0);
}
/*
Log_event::write_header()
*/
bool Log_event::write_header(size_t event_data_length)
{
uchar header[LOG_EVENT_HEADER_LEN];
ulong now;
DBUG_ENTER("Log_event::write_header");
DBUG_PRINT("enter", ("filepos: %lld length: %zu type: %d",
(longlong) writer->pos(), event_data_length,
(int) get_type_code()));
writer->checksum_len= need_checksum() ? BINLOG_CHECKSUM_LEN : 0;
/* Store number of bytes that will be written by this event */
data_written= event_data_length + sizeof(header) + writer->checksum_len;
/*
log_pos != 0 if this is relay-log event. In this case we should not
change the position
*/
if (is_artificial_event())
{
/*
Artificial events are automatically generated and do not exist
in master's binary log, so log_pos should be set to 0.
*/
log_pos= 0;
}
else if (!log_pos)
{
/*
Calculate the position of where the next event will start
(end of this event, that is).
*/
log_pos= writer->pos() + data_written;
DBUG_EXECUTE_IF("dbug_master_binlog_over_2GB", log_pos += (1ULL <<31););
}
now= get_time(); // Query start time
/*
Header will be of size LOG_EVENT_HEADER_LEN for all events, except for
FORMAT_DESCRIPTION_EVENT and ROTATE_EVENT, where it will be
LOG_EVENT_MINIMAL_HEADER_LEN (remember these 2 have a frozen header,
because we read them before knowing the format).
*/
int4store(header, now); // timestamp
header[EVENT_TYPE_OFFSET]= get_type_code();
int4store(header+ SERVER_ID_OFFSET, server_id);
int4store(header+ EVENT_LEN_OFFSET, data_written);
int4store(header+ LOG_POS_OFFSET, log_pos);
int2store(header + FLAGS_OFFSET, flags);
bool ret= writer->write_header(header, sizeof(header));
DBUG_RETURN(ret);
}
#if defined(HAVE_REPLICATION)
inline Log_event::enum_skip_reason
Log_event::continue_group(rpl_group_info *rgi)
{
if (rgi->rli->slave_skip_counter == 1)
return Log_event::EVENT_SKIP_IGNORE;
return Log_event::do_shall_skip(rgi);
}
#endif
/**************************************************************************
Query_log_event methods
**************************************************************************/
#if defined(HAVE_REPLICATION)
/**
This (which is used only for SHOW BINLOG EVENTS) could be updated to
print SET @@session_var=. But this is not urgent, as SHOW BINLOG EVENTS is
only an information, it does not produce suitable queries to replay (for
example it does not print LOAD DATA INFILE).
@todo
show the catalog ??
*/
void Query_log_event::pack_info(Protocol *protocol)
{