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/**
* Copyright (C) 2021-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/db/s/collmod_coordinator_document_gen.h"
#include "mongo/db/s/sharding_ddl_coordinator.h"
#include "mongo/s/request_types/sharded_ddl_commands_gen.h"
namespace mongo {
class CollModCoordinator final : public ShardingDDLCoordinator {
public:
using StateDoc = CollModCoordinatorDocument;
using Phase = CollModCoordinatorPhaseEnum;
CollModCoordinator(ShardingDDLCoordinatorService* service, const BSONObj& initialState);
void checkIfOptionsConflict(const BSONObj& doc) const override;
boost::optional<BSONObj> reportForCurrentOp(
MongoProcessInterface::CurrentOpConnectionsMode connMode,
MongoProcessInterface::CurrentOpSessionsMode sessionMode) noexcept override;
/**
* Waits for the termination of the parent DDLCoordinator (so all the resources are liberated)
* and then return the result.
*/
BSONObj getResult(OperationContext* opCtx) {
getCompletionFuture().get(opCtx);
invariant(_result.is_initialized());
return *_result;
}
private:
struct CollectionInfo {
bool isSharded;
boost::optional<TimeseriesOptions> timeSeriesOptions;
// The targeting namespace can be different from the original namespace in some cases, like
// time-series collections.
NamespaceString nsForTargeting;
};
struct ShardingInfo {
// The primary shard for the collection, only set if the collection is sharded.
ShardId primaryShard;
// The shards owning chunks for the collection, only set if the collection is sharded.
std::vector<ShardId> shardsOwningChunks;
};
ShardingDDLCoordinatorMetadata const& metadata() const override {
return _doc.getShardingDDLCoordinatorMetadata();
}
ExecutorFuture<void> _runImpl(std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept override;
template <typename Func>
auto _executePhase(const Phase& newPhase, Func&& func) {
return [=] {
const auto& currPhase = _doc.getPhase();
if (currPhase > newPhase) {
// Do not execute this phase if we already reached a subsequent one.
return;
}
if (currPhase < newPhase) {
// Persist the new phase if this is the first time we are executing it.
_enterPhase(newPhase);
}
return func();
};
}
void _enterPhase(Phase newPhase);
void _performNoopRetryableWriteOnParticipants(
OperationContext* opCtx, const std::shared_ptr<executor::TaskExecutor>& executor);
void _saveCollectionInfoOnCoordinatorIfNecessary(OperationContext* opCtx);
void _saveShardingInfoOnCoordinatorIfNecessary(OperationContext* opCtx);
BSONObj _initialState;
mutable Mutex _docMutex = MONGO_MAKE_LATCH("CollModCoordinator::_docMutex");
CollModCoordinatorDocument _doc;
const mongo::CollModRequest _request;
boost::optional<BSONObj> _result;
boost::optional<CollectionInfo> _collInfo;
boost::optional<ShardingInfo> _shardingInfo;
};
} // namespace mongo
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