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// repair_cursor.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/platform/basic.h"
#include <memory>
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/exec/multi_iterator.h"
#include "mongo/db/query/cursor_response.h"
namespace mongo {
using std::string;
class RepairCursorCmd : public Command {
public:
RepairCursorCmd() : Command("repairCursor") {}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual bool slaveOk() const {
return true;
}
virtual Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
ActionSet actions;
actions.addAction(ActionType::find);
Privilege p(parseResourcePattern(dbname, cmdObj), actions);
if (AuthorizationSession::get(client)->isAuthorizedForPrivilege(p))
return Status::OK();
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
virtual bool run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj,
int options,
string& errmsg,
BSONObjBuilder& result) {
NamespaceString ns(parseNs(dbname, cmdObj));
AutoGetCollectionForRead ctx(txn, ns.ns());
Collection* collection = ctx.getCollection();
if (!collection) {
return appendCommandStatus(
result, Status(ErrorCodes::NamespaceNotFound, "ns does not exist: " + ns.ns()));
}
auto cursor = collection->getRecordStore()->getCursorForRepair(txn);
if (!cursor) {
return appendCommandStatus(
result, Status(ErrorCodes::CommandNotSupported, "repair iterator not supported"));
}
std::unique_ptr<WorkingSet> ws(new WorkingSet());
std::unique_ptr<MultiIteratorStage> stage(
new MultiIteratorStage(txn, ws.get(), collection));
stage->addIterator(std::move(cursor));
auto statusWithPlanExecutor = PlanExecutor::make(
txn, std::move(ws), std::move(stage), collection, PlanExecutor::YIELD_AUTO);
invariant(statusWithPlanExecutor.isOK());
std::unique_ptr<PlanExecutor> exec = std::move(statusWithPlanExecutor.getValue());
// 'exec' will be used in getMore(). It was automatically registered on construction
// due to the auto yield policy, so it could yield during plan selection. We deregister
// it now so that it can be registed with ClientCursor.
exec->deregisterExec();
exec->saveState();
exec->detachFromOperationContext();
// ClientCursors' constructor inserts them into a global map that manages their
// lifetimes. That is why the next line isn't leaky.
ClientCursor* cc =
new ClientCursor(collection->getCursorManager(),
exec.release(),
ns.ns(),
txn->recoveryUnit()->isReadingFromMajorityCommittedSnapshot());
appendCursorResponseObject(cc->cursorid(), ns.ns(), BSONArray(), &result);
return true;
}
} repairCursorCmd;
}
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