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/* Copyright (C) 2013-2015 Codership Oy <info@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. */
#include "mariadb.h"
#include "mysql/service_wsrep.h"
#include "wsrep_applier.h"
#include "wsrep_priv.h"
#include "wsrep_binlog.h" // wsrep_dump_rbr_buf()
#include "wsrep_xid.h"
#include "wsrep_thd.h"
#include "wsrep_trans_observer.h"
#include "slave.h" // opt_log_slave_updates
#include "log_event.h" // class THD, EVENT_LEN_OFFSET, etc.
#include "debug_sync.h"
/*
read the first event from (*buf). The size of the (*buf) is (*buf_len).
At the end (*buf) is shitfed to point to the following event or NULL and
(*buf_len) will be changed to account just being read bytes of the 1st event.
*/
static Log_event* wsrep_read_log_event(
char **arg_buf, size_t *arg_buf_len,
const Format_description_log_event *description_event)
{
DBUG_ENTER("wsrep_read_log_event");
char *head= (*arg_buf);
uint data_len= uint4korr(head + EVENT_LEN_OFFSET);
char *buf= (*arg_buf);
const char *error= 0;
Log_event *res= 0;
res= Log_event::read_log_event(buf, data_len, &error, description_event,
true);
if (!res)
{
DBUG_ASSERT(error != 0);
sql_print_error("Error in Log_event::read_log_event(): "
"'%s', data_len: %d, event_type: %d",
error,data_len,head[EVENT_TYPE_OFFSET]);
}
(*arg_buf)+= data_len;
(*arg_buf_len)-= data_len;
DBUG_RETURN(res);
}
#include "transaction.h" // trans_commit(), trans_rollback()
#include "rpl_rli.h" // class Relay_log_info;
void wsrep_set_apply_format(THD* thd, Format_description_log_event* ev)
{
if (thd->wsrep_apply_format)
{
delete (Format_description_log_event*)thd->wsrep_apply_format;
}
thd->wsrep_apply_format= ev;
}
Format_description_log_event*
wsrep_get_apply_format(THD* thd)
{
if (thd->wsrep_apply_format)
{
return (Format_description_log_event*) thd->wsrep_apply_format;
}
DBUG_ASSERT(thd->wsrep_rgi);
return thd->wsrep_rgi->rli->relay_log.description_event_for_exec;
}
void wsrep_apply_error::store(const THD* const thd)
{
Diagnostics_area::Sql_condition_iterator it=
thd->get_stmt_da()->sql_conditions();
const Sql_condition* cond;
static size_t const max_len= 2*MAX_SLAVE_ERRMSG; // 2x so that we have enough
if (NULL == str_)
{
// this must be freeable by standard free()
str_= static_cast<char*>(malloc(max_len));
if (NULL == str_)
{
WSREP_ERROR("Failed to allocate %zu bytes for error buffer.", max_len);
len_= 0;
return;
}
}
else
{
/* This is possible when we invoke rollback after failed applying.
* In this situation DA should not be reset yet and should contain
* all previous errors from applying and new ones from rollbacking,
* so we just overwrite is from scratch */
}
char* slider= str_;
const char* const buf_end= str_ + max_len - 1; // -1: leave space for \0
for (cond= it++; cond && slider < buf_end; cond= it++)
{
uint const err_code= cond->get_sql_errno();
const char* const err_str= cond->get_message_text();
slider+= my_snprintf(slider, buf_end - slider, " %s, Error_code: %d;",
err_str, err_code);
}
*slider= '\0';
len_= slider - str_ + 1; // +1: add \0
WSREP_DEBUG("Error buffer for thd %llu seqno %lld, %zu bytes: %s",
thd->thread_id, (long long)wsrep_thd_trx_seqno(thd),
len_, str_ ? str_ : "(null)");
}
int wsrep_apply_events(THD* thd,
Relay_log_info* rli,
const void* events_buf,
size_t buf_len)
{
char *buf= (char *)events_buf;
int rcode= 0;
int event= 1;
Log_event_type typ;
DBUG_ENTER("wsrep_apply_events");
if (!buf_len) WSREP_DEBUG("empty rbr buffer to apply: %lld",
(long long) wsrep_thd_trx_seqno(thd));
while (buf_len)
{
int exec_res;
Log_event* ev= wsrep_read_log_event(&buf, &buf_len,
wsrep_get_apply_format(thd));
if (!ev)
{
WSREP_ERROR("applier could not read binlog event, seqno: %lld, len: %zu",
(long long)wsrep_thd_trx_seqno(thd), buf_len);
rcode= WSREP_ERR_BAD_EVENT;
goto error;
}
typ= ev->get_type_code();
switch (typ) {
case FORMAT_DESCRIPTION_EVENT:
wsrep_set_apply_format(thd, (Format_description_log_event*)ev);
continue;
#ifdef GTID_SUPPORT
case GTID_LOG_EVENT:
{
Gtid_log_event* gev= (Gtid_log_event*)ev;
if (gev->get_gno() == 0)
{
/* Skip GTID log event to make binlog to generate LTID on commit */
delete ev;
continue;
}
}
#endif /* GTID_SUPPORT */
default:
break;
}
/* Use the original server id for logging. */
thd->set_server_id(ev->server_id);
thd->set_time(); // time the query
thd->transaction.start_time.reset(thd);
thd->lex->current_select= 0;
if (!ev->when)
{
my_hrtime_t hrtime= my_hrtime();
ev->when= hrtime_to_my_time(hrtime);
ev->when_sec_part= hrtime_sec_part(hrtime);
}
thd->variables.option_bits=
(thd->variables.option_bits & ~OPTION_SKIP_REPLICATION) |
(ev->flags & LOG_EVENT_SKIP_REPLICATION_F ? OPTION_SKIP_REPLICATION : 0);
ev->thd= thd;
exec_res= ev->apply_event(thd->wsrep_rgi);
DBUG_PRINT("info", ("exec_event result: %d", exec_res));
if (exec_res)
{
WSREP_WARN("Event %d %s apply failed: %d, seqno %lld",
event, ev->get_type_str(), exec_res,
(long long) wsrep_thd_trx_seqno(thd));
rcode= exec_res;
/* stop processing for the first error */
delete ev;
goto error;
}
event++;
delete_or_keep_event_post_apply(thd->wsrep_rgi, typ, ev);
}
error:
if (thd->killed == KILL_CONNECTION)
WSREP_INFO("applier aborted: %lld", (long long)wsrep_thd_trx_seqno(thd));
wsrep_set_apply_format(thd, NULL);
DBUG_RETURN(rcode);
}
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