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/**
* Copyright (C) 2020-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.
*/
#pragma once
#include "mongo/base/string_data.h"
#include "mongo/client/remote_command_targeter_rs.h"
#include "mongo/db/repl/primary_only_service.h"
#include "mongo/db/repl/tenant_migration_donor_util.h"
#include "mongo/util/string_map.h"
namespace mongo {
class TenantMigrationDonorService final : public repl::PrimaryOnlyService {
public:
static constexpr StringData kServiceName = "TenantMigrationDonorService"_sd;
explicit TenantMigrationDonorService(ServiceContext* serviceContext)
: PrimaryOnlyService(serviceContext) {
_serviceContext = serviceContext;
}
~TenantMigrationDonorService() = default;
StringData getServiceName() const override {
return kServiceName;
}
NamespaceString getStateDocumentsNS() const override {
return NamespaceString::kTenantMigrationDonorsNamespace;
}
ThreadPool::Limits getThreadPoolLimits() const override {
// TODO (SERVER-50438): Limit the size of TenantMigrationDonorService thread pool.
return ThreadPool::Limits();
}
std::shared_ptr<PrimaryOnlyService::Instance> constructInstance(
BSONObj initialState) const override {
return std::make_shared<TenantMigrationDonorService::Instance>(_serviceContext,
initialState);
}
class Instance final : public PrimaryOnlyService::TypedInstance<Instance> {
public:
Instance(ServiceContext* serviceContext, const BSONObj& initialState);
SemiFuture<void> run(
std::shared_ptr<executor::ScopedTaskExecutor> executor) noexcept override;
/**
* To be called on the instance returned by PrimaryOnlyService::getOrCreate. Returns an
* error if the options this Instance was created with are incompatible with a request for
* an instance with the options given in 'options'.
*/
Status checkIfOptionsConflict(BSONObj options);
/**
* Returns a Future that will be resolved when the migration has committed or aborted.
*/
SharedSemiFuture<void> getDecisionFuture() const {
return _decisionPromise.getFuture();
}
void onReceiveDonorForgetMigration() {
_receivedDonorForgetMigrationPromise.emplaceValue();
}
private:
const NamespaceString _stateDocumentsNS = NamespaceString::kTenantMigrationDonorsNamespace;
/**
* Inserts the state document to _stateDocumentsNS and returns the opTime for the insert
* oplog entry.
*/
repl::OpTime _insertStateDocument();
/**
* Updates the state document to have the given state. Then, persists the updated document
* by reserving an oplog slot beforehand and using its timestamp as the blockTimestamp or
* commitOrAbortTimestamp depending on the state. Returns the opTime for the update oplog
* entry.
*/
repl::OpTime _updateStateDocument(const TenantMigrationDonorStateEnum nextState);
/**
* Sets the "expireAt" time for the state document to be garbage collected.
*/
repl::OpTime _markStateDocumentAsGarbageCollectable();
/**
* Waits for given opTime to be majority committed.
*/
ExecutorFuture<void> _waitForMajorityWriteConcern(
const std::shared_ptr<executor::ScopedTaskExecutor>& executor, repl::OpTime opTime);
/**
* Sends the given command to the recipient replica set.
*/
ExecutorFuture<void> _sendCommandToRecipient(
OperationContext* opCtx,
const std::shared_ptr<executor::ScopedTaskExecutor>& executor,
RemoteCommandTargeter* recipientTargeter,
const BSONObj& cmdObj);
/**
* Sends the recipientSyncData command to the recipient replica set.
*/
ExecutorFuture<void> _sendRecipientSyncDataCommand(
const std::shared_ptr<executor::ScopedTaskExecutor>& executor,
RemoteCommandTargeter* recipientTargeter);
/**
* Sends the recipientForgetMigration command to the recipient replica set.
*/
ExecutorFuture<void> _sendRecipientForgetMigrationCommand(
const std::shared_ptr<executor::ScopedTaskExecutor>& executor,
RemoteCommandTargeter* recipientTargeter);
ServiceContext* _serviceContext;
TenantMigrationDonorDocument _stateDoc;
std::shared_ptr<TenantMigrationAccessBlocker> _mtab;
boost::optional<Status> _abortReason;
// Promise that is resolved when the donor has majority-committed the migration decision.
SharedPromise<void> _decisionPromise;
// Promise that is resolved when the donor receives the donorForgetMigration command.
SharedPromise<void> _receivedDonorForgetMigrationPromise;
};
private:
ServiceContext* _serviceContext;
};
} // namespace mongo
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