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/**
* Copyright (C) 2015 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/platform/basic.h"
#include <vector>
#include "mongo/db/commands.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/commands/cluster_commands_common.h"
#include "mongo/s/grid.h"
namespace mongo {
namespace {
using std::vector;
class DBStatsCmd : public Command {
public:
DBStatsCmd() : Command("dbStats", false, "dbstats") {}
bool slaveOk() const override {
return true;
}
bool adminOnly() const override {
return false;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::dbStats);
out->push_back(Privilege(ResourcePattern::forDatabaseName(dbname), actions));
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
bool run(OperationContext* opCtx,
const std::string& dbName,
BSONObj& cmdObj,
std::string& errmsg,
BSONObjBuilder& output) override {
auto shardResponses =
uassertStatusOK(scatterGather(opCtx, dbName, cmdObj, getReadPref(cmdObj)));
if (!appendRawResponses(opCtx, &errmsg, &output, shardResponses)) {
return false;
}
aggregateResults(shardResponses, output);
return true;
}
void aggregateResults(const vector<AsyncRequestsSender::Response>& responses,
BSONObjBuilder& output) {
long long objects = 0;
long long unscaledDataSize = 0;
long long dataSize = 0;
long long storageSize = 0;
long long numExtents = 0;
long long indexes = 0;
long long indexSize = 0;
long long fileSize = 0;
long long freeListNum = 0;
long long freeListSize = 0;
for (const auto& response : responses) {
invariant(response.swResponse.getStatus().isOK());
const BSONObj& b = response.swResponse.getValue().data;
objects += b["objects"].numberLong();
unscaledDataSize += b["avgObjSize"].numberLong() * b["objects"].numberLong();
dataSize += b["dataSize"].numberLong();
storageSize += b["storageSize"].numberLong();
numExtents += b["numExtents"].numberLong();
indexes += b["indexes"].numberLong();
indexSize += b["indexSize"].numberLong();
fileSize += b["fileSize"].numberLong();
if (b["extentFreeList"].isABSONObj()) {
freeListNum += b["extentFreeList"].Obj()["num"].numberLong();
freeListSize += b["extentFreeList"].Obj()["totalSize"].numberLong();
}
}
// TODO SERVER-26110: Add aggregated 'collections' and 'views' metrics.
output.appendNumber("objects", objects);
// avgObjSize on mongod is not scaled based on the argument to db.stats(), so we use
// unscaledDataSize here for consistency. See SERVER-7347.
output.append("avgObjSize", objects == 0 ? 0 : double(unscaledDataSize) / double(objects));
output.appendNumber("dataSize", dataSize);
output.appendNumber("storageSize", storageSize);
output.appendNumber("numExtents", numExtents);
output.appendNumber("indexes", indexes);
output.appendNumber("indexSize", indexSize);
output.appendNumber("fileSize", fileSize);
{
BSONObjBuilder extentFreeList(output.subobjStart("extentFreeList"));
extentFreeList.appendNumber("num", freeListNum);
extentFreeList.appendNumber("totalSize", freeListSize);
extentFreeList.done();
}
}
} clusterDBStatsCmd;
} // namespace
} // namespace mongo
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