// server_status_internal.cpp

/**
*    Copyright (C) 2014 MongoDB 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.
*/

#include "mongo/db/commands/server_status_internal.h"

#include "mongo/db/commands/server_status_metric.h"
#include "mongo/util/mongoutils/str.h"

namespace mongo {

    using namespace mongoutils;

    MetricTree* MetricTree::theMetricTree = NULL;

    void MetricTree::add( ServerStatusMetric* metric ) {
        string name = metric->getMetricName();
        if ( name[0] == '.' )
            _add( name.substr(1), metric );
        else
            _add( str::stream() << "metrics." << name, metric );
    }

    void MetricTree::_add( const string& path, ServerStatusMetric* metric ) {
        size_t idx = path.find( "." );
        if ( idx == string::npos ) {
            _metrics[path] = metric;
            return;
        }

        string myLevel = path.substr( 0, idx );
        if ( _metrics.count( myLevel ) > 0 ) {
            cerr << "metric conflict on: " << myLevel << endl;
            fassertFailed( 16461 );
        }

        MetricTree*& sub = _subtrees[myLevel];
        if ( ! sub )
            sub = new MetricTree();
        sub->_add( path.substr( idx + 1 ), metric );
    }

    void MetricTree::appendTo( BSONObjBuilder& b ) const {
        for ( map<string,ServerStatusMetric*>::const_iterator i = _metrics.begin(); i != _metrics.end(); ++i ) {
            i->second->appendAtLeaf( b );
        }

        for ( map<string,MetricTree*>::const_iterator i = _subtrees.begin(); i != _subtrees.end(); ++i ) {
            BSONObjBuilder bb( b.subobjStart( i->first ) );
            i->second->appendTo( bb );
            bb.done();
        }
    }

}

