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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright 2011 Daniel Nichter
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <string>
#include <fcntl.h>
#include <drizzled/item.h>
#include <drizzled/module/option_map.h>
#include <drizzled/session.h>
#include <drizzled/session/times.h>
#include <drizzled/plugin.h>
#include "query_log.h"
using namespace std;
using namespace drizzled;
using namespace plugin;
QueryLog::QueryLog(bool enabled, QueryLoggerFile *logger_file) :
drizzled::plugin::EventObserver("query_log"),
sysvar_enabled(enabled),
_logger_file(logger_file)
{
}
QueryLog::~QueryLog()
{
}
void QueryLog::registerSessionEventsDo(Session &, EventObserverList &observers)
{
registerEvent(observers, AFTER_STATEMENT);
}
bool QueryLog::observeEventDo(EventData &data)
{
// Don't log and return successful if...
if (not sysvar_enabled // all logging is disabled
|| not sysvar_file_enabled) // or file logging is disabled
return false;
switch (data.event) {
case AFTER_STATEMENT:
afterStatement((AfterStatementEventData &)data);
break;
default:
fprintf(stderr, "query_log: Unexpected event '%s'\n",
EventObserver::eventName(data.event));
}
return false;
}
bool QueryLog::afterStatement(AfterStatementEventData &data)
{
Session *session= &data.session;
// For the moment we're only interestd in queries, not admin
// command and such.
if (session->command != COM_QUERY)
return false;
// Query end time (microseconds from epoch)
uint64_t t_mark= session->times.getCurrentTimestamp(false);
/**
* Time values, first in microseconds so we can check the thresholds.
*/
_event.execution_time= session->times.getElapsedTime();
_event.lock_time= (t_mark - session->times.utime_after_lock);
_event.session_time= (t_mark - session->times.getConnectMicroseconds());
/**
* Check thresholds as soon as possible, return early if possible.
* This avoid unnecessary work; i.e. don't construct the whole event
* only to throw it away at the end because it fails a threshold.
*/
if ( _event.execution_time < sysvar_threshold_execution_time
|| _event.lock_time < sysvar_threshold_lock_time
|| _event.session_time < sysvar_threshold_session_time)
return false;
/**
* Convert from microseconds to seconds, e.g. 42 to 0.000042
* This is done for the user who may read the log. It's a lot
* easier to see half a second as 0.5 than 500000.
*/
_event.execution_time= _event.execution_time * 0.000001;
_event.lock_time= _event.lock_time * 0.000001;
_event.session_time= _event.session_time * 0.000001;
/**
* Integer values
*/
_event.session_id= session->getSessionId();
_event.query_id= session->getQueryId();
_event.rows_examined= session->examined_row_count;
_event.rows_sent= session->sent_row_count;
_event.tmp_tables= session->tmp_table;
_event.warnings= session->total_warn_count;
if ( _event.rows_examined < sysvar_threshold_rows_examined
|| _event.rows_sent < sysvar_threshold_rows_sent
|| _event.tmp_tables < sysvar_threshold_tmp_tables
|| _event.warnings < sysvar_threshold_warnings)
return false;
/**
* Boolean values, as strings
*/
_event.error= session->is_error() ? "true" : "false";
/**
* String values, may be blank
*/
_event.schema= session->schema()->c_str();
/**
* The query string
*/
_event.query= session->getQueryString()->c_str();
/**
* Timestamp values, convert from microseconds from epoch to
* ISO timestamp like 2002-01-31T10:00:01.123456
*/
boost::posix_time::ptime t_start= session->times.start_timer();
_event.ts= boost::posix_time::to_iso_extended_string(t_start);
// Pass the event to the loggers.
_logger_file->logEvent((const event_t *)&_event);
return false; // success
}
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