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/**
* Copyright (C) 2018 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.h"
#include "mongo/db/operation_context.h"
namespace mongo {
/**
* Base class for the killOp command, which attempts to kill a given operation. Contains code
* common to mongos and mongod implementations.
*/
class KillOpCmdBase : public BasicCommand {
public:
KillOpCmdBase() : BasicCommand("killOp") {}
virtual ~KillOpCmdBase() = default;
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
bool adminOnly() const override {
return true;
}
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) const final;
protected:
/**
* Given an operation ID, search for an OperationContext with that ID. Returns either
* boost::none if no operation with the given ID exists, or the OperationContext along with the
* (acquired) lock for the associated Client.
*/
static boost::optional<std::tuple<stdx::unique_lock<Client>, OperationContext*>>
findOperationContext(ServiceContext* serviceContext, unsigned int opId);
/**
* Find the given operation, and check if we're authorized to kill it. If the operation is
* found, and we're allowed to kill it, this returns the OperationContext as well as the
* acquired lock for the associated Client. Otherwise boost::none is returned.
*/
static boost::optional<std::tuple<stdx::unique_lock<Client>, OperationContext*>>
findOpForKilling(Client* client, unsigned int opId);
/**
* Kill an operation running on this instance of mongod or mongos.
*/
static void killLocalOperation(OperationContext* opCtx, unsigned int opToKill);
/**
* Extract the "op" field from 'cmdObj' and convert the value to unsigned int. Since BSON only
* supports signed number types, and an opId is unsigned, the "op" field of 'cmdObj' may be
* negative, so that it can be stored in a signed type. The conversion back to unsigned is
* taken care of here.
*/
static unsigned int parseOpId(const BSONObj& cmdObj);
/**
* Return whether the operation being killed is "local" or not. All operations on a mongod are
* local. On a mongos, killOp may may kill an operation on a shard, or an operation "local" to
* the mongos.
*
* Expects to be passed the "op" field of the command object.
*/
static bool isKillingLocalOp(const BSONElement& opElem);
};
} // namespace mongo
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