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path: root/src/mongo/db/query/qlog.h
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/**
 *    Copyright (C) 2013 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    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 Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#pragma once

#include "mongo/logger/log_component.h"
#include "mongo/logger/log_severity.h"
#include "mongo/logger/logger.h"
#include "mongo/logger/logstream_builder.h"
#include "mongo/util/concurrency/thread_name.h"

namespace mongo {

    /**
     * Verbose query logging is determined by the 'Query' log level in the global log domain.
     * Set to verbosity 5 to enable.
     *
     * Command line:
     *     ./mongod --setParameter=logComponentVerbosity="{query: {verbosity: 5}}"
     *
     * Config file:
     *     systemLog:
     *         component:
     *             query:
     *                 verbosity: 5
     *
     * Shell:
     *     Enable:
     *         db.adminCommand({setParameter: 1, logComponentVerbosity: {query: {verbosity: 5}}})
     *     Disable:
     *         db.adminCommand({setParameter: 1, logComponentVerbosity: {query: {verbosity: -1}}})
     */
    const logger::LogComponent verboseQueryLogComponent = logger::LogComponent::kQuery;
    const logger::LogSeverity verboseQueryLogSeverity = logger::LogSeverity::Debug(5);

// With a #define like this, we don't evaluate the costly toString()s that are QLOG'd
#define QLOG() \
    if (!(::mongo::logger::globalLogDomain())->shouldLog(::mongo::verboseQueryLogComponent, ::mongo::verboseQueryLogSeverity)) {} \
    else ::mongo::logger::LogstreamBuilder(::mongo::logger::globalLogDomain(), ::mongo::getThreadName(), ::mongo::verboseQueryLogSeverity, ::mongo::verboseQueryLogComponent) << "[QLOG] "

    bool qlogOff();
    bool qlogOn();

}  // namespace mongo