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MDEV-34705: Binlog-in-engine: Implement SHOW BINLOG EVENTS

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Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2025-03-01 22:20:19 +01:00
parent 980a8e6c42
commit 9e1fe70bfe
6 changed files with 161 additions and 0 deletions
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86
sql/sql_repl.cc
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@@ -4821,6 +4821,88 @@ int reset_master(THD* thd, rpl_gtid *init_state, uint32 init_state_len,
}
/* Version of mysql_show_binlog_events() for --binlog-storage-engine. */
static bool
show_engine_binlog_events(THD* thd, Protocol *protocol, LEX_MASTER_INFO *lex_mi)
{
bool err= false;
DBUG_ASSERT(opt_binlog_engine_hton);
DBUG_ASSERT(thd->lex->sql_command == SQLCOM_SHOW_BINLOG_EVENTS);
handler_binlog_reader *reader= (*opt_binlog_engine_hton->get_binlog_reader)();
if (!reader)
{
my_error(ER_OUT_OF_RESOURCES, MYF(0));
return true;
}
if (reader->init_legacy_pos(lex_mi->log_file_name, lex_mi->pos))
{
err= true;
goto end;
}
{
SELECT_LEX_UNIT *unit= &thd->lex->unit;
unit->set_limit(thd->lex->current_select);
uint64_t file_no= reader->cur_file_no;
ha_rows limit= unit->lim.get_select_limit();
String packet;
Format_description_log_event fd(4);
char name_buf[FN_REFLEN];
reader->get_filename(name_buf, file_no);
for (ha_rows event_count= 0;
reader->cur_file_no == file_no && event_count < limit;
++event_count)
{
packet.length(0);
int reader_error= reader->read_log_event(&packet, 0,
thd->variables.max_allowed_packet + MAX_LOG_EVENT_HEADER);
if (reader_error)
{
if (reader_error != LOG_READ_EOF)
{
my_error(ER_ERROR_WHEN_EXECUTING_COMMAND, MYF(0),
"SHOW BINLOG EVENTS", "error reading event data");
err= true;
}
break;
}
if (unit->lim.check_offset(event_count))
continue;
const char *errmsg;
Log_event *ev= Log_event::read_log_event((const uchar *)packet.ptr(),
(uint)packet.length(),
&errmsg, &fd, false, false);
if (!ev)
{
my_error(ER_ERROR_WHEN_EXECUTING_COMMAND, MYF(0),
"SHOW BINLOG EVENTS", errmsg);
err= true;
break;
}
int send_err= ev->net_send(protocol, name_buf, 0);
delete ev;
if (send_err)
{
my_error(ER_ERROR_WHEN_EXECUTING_COMMAND, MYF(0),
"SHOW BINLOG EVENTS", "Net error");
err= true;
break;
}
}
}
end:
if (!err)
my_eof(thd);
delete reader;
return err;
}
/**
Execute a SHOW BINLOG EVENTS statement.
@@ -4860,6 +4942,10 @@ bool mysql_show_binlog_events(THD* thd)
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
DBUG_RETURN(TRUE);
if (opt_binlog_engine_hton &&
thd->lex->sql_command == SQLCOM_SHOW_BINLOG_EVENTS)
DBUG_RETURN(show_engine_binlog_events(thd, protocol, lex_mi));
DBUG_ASSERT(thd->lex->sql_command == SQLCOM_SHOW_BINLOG_EVENTS ||
thd->lex->sql_command == SQLCOM_SHOW_RELAYLOG_EVENTS);