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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/commands.h"
#include "mongo/base/init.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/resource_pattern.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/service_context.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
Status _performNoopWrite(OperationContext* opCtx, BSONObj msgObj, StringData note) {
repl::ReplicationCoordinator* const replCoord = repl::ReplicationCoordinator::get(opCtx);
// Use GlobalLock instead of DBLock to allow return when the lock is not available. It may
// happen when the primary steps down and a shared global lock is acquired.
Lock::GlobalLock lock(
opCtx, MODE_IX, Date_t::now() + Milliseconds(1), Lock::InterruptBehavior::kThrow);
if (!lock.isLocked()) {
LOG(1) << "Global lock is not available skipping noopWrite";
return {ErrorCodes::LockFailed, "Global lock is not available"};
}
// Its a proxy for being a primary passing "local" will cause it to return true on secondary
if (!replCoord->canAcceptWritesForDatabase(opCtx, "admin")) {
return {ErrorCodes::NotMaster, "Not a primary"};
}
writeConflictRetry(opCtx, note, NamespaceString::kRsOplogNamespace.ns(), [&opCtx, &msgObj] {
WriteUnitOfWork uow(opCtx);
opCtx->getClient()->getServiceContext()->getOpObserver()->onOpMessage(opCtx, msgObj);
uow.commit();
});
return Status::OK();
}
} // namespace
using std::string;
using std::stringstream;
class AppendOplogNoteCmd : public BasicCommand {
public:
AppendOplogNoteCmd() : BasicCommand("appendOplogNote") {}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
virtual bool adminOnly() const {
return true;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
std::string help() const override {
return "Adds a no-op entry to the oplog";
}
virtual Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) const {
if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
ResourcePattern::forClusterResource(), ActionType::appendOplogNote)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
virtual bool run(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result) {
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
if (!replCoord->isReplEnabled()) {
uasserted(ErrorCodes::NoReplicationEnabled,
"Must have replication set up to run \"appendOplogNote\"");
}
BSONElement dataElement;
auto dataStatus = bsonExtractTypedField(cmdObj, "data", Object, &dataElement);
uassertStatusOK(dataStatus);
Timestamp maxClusterTime;
auto maxClusterTimeStatus =
bsonExtractTimestampField(cmdObj, "maxClusterTime", &maxClusterTime);
if (!maxClusterTimeStatus.isOK()) {
if (maxClusterTimeStatus == ErrorCodes::NoSuchKey) { // no need to use maxClusterTime
uassertStatusOK(_performNoopWrite(opCtx, dataElement.Obj(), "appendOpLogNote"));
return true;
}
uassertStatusOK(maxClusterTimeStatus);
}
auto lastAppliedOpTime = replCoord->getMyLastAppliedOpTime().getTimestamp();
if (maxClusterTime > lastAppliedOpTime) {
uassertStatusOK(_performNoopWrite(opCtx, dataElement.Obj(), "appendOpLogNote"));
} else {
std::stringstream ss;
ss << "Requested maxClusterTime " << LogicalTime(maxClusterTime).toString()
<< " is less or equal to the last primary OpTime: "
<< LogicalTime(lastAppliedOpTime).toString();
uasserted(ErrorCodes::StaleClusterTime, ss.str());
}
return true;
}
};
MONGO_INITIALIZER(RegisterAppendOpLogNoteCmd)(InitializerContext* context) {
new AppendOplogNoteCmd();
return Status::OK();
}
} // namespace mongo
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