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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 "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/query/cursor_response.h"
#include "mongo/db/query/getmore_request.h"
#include "mongo/db/stats/counters.h"
#include "mongo/s/query/cluster_cursor_manager.h"
#include "mongo/s/query/cluster_find.h"
namespace mongo {
namespace {
/**
* Implements the getMore command on mongos. Retrieves more from an existing mongos cursor
* corresponding to the cursor id passed from the application. In order to generate these results,
* may issue getMore commands to remote nodes in one or more shards.
*/
class ClusterGetMoreCmd final : public Command {
MONGO_DISALLOW_COPYING(ClusterGetMoreCmd);
public:
ClusterGetMoreCmd() : Command("getMore") {}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
bool slaveOk() const final {
return true;
}
bool maintenanceOk() const final {
return false;
}
bool adminOnly() const final {
return false;
}
/**
* A getMore command increments the getMore counter, not the command counter.
*/
bool shouldAffectCommandCounter() const final {
return false;
}
void help(std::stringstream& help) const final {
help << "retrieve more documents for a cursor id";
}
Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) final {
StatusWith<GetMoreRequest> parseStatus = GetMoreRequest::parseFromBSON(dbname, cmdObj);
if (!parseStatus.isOK()) {
return parseStatus.getStatus();
}
const GetMoreRequest& request = parseStatus.getValue();
return AuthorizationSession::get(client)->checkAuthForGetMore(
request.nss, request.cursorid, request.term.is_initialized());
}
bool run(OperationContext* txn,
const std::string& dbname,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) final {
// Counted as a getMore, not as a command.
globalOpCounters.gotGetMore();
StatusWith<GetMoreRequest> parseStatus = GetMoreRequest::parseFromBSON(dbname, cmdObj);
if (!parseStatus.isOK()) {
return appendCommandStatus(result, parseStatus.getStatus());
}
const GetMoreRequest& request = parseStatus.getValue();
auto response = ClusterFind::runGetMore(txn, request);
if (!response.isOK()) {
return appendCommandStatus(result, response.getStatus());
}
response.getValue().addToBSON(CursorResponse::ResponseType::SubsequentResponse, &result);
return true;
}
} cmdGetMoreCluster;
} // namespace
} // namespace mongo
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