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/**
* Copyright (C) 2022-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/client/sdam/topology_listener.h"
#include "mongo/db/repl/optime_with.h"
#include "mongo/db/repl/repl_set_config.h"
#include "mongo/db/serverless/shard_split_state_machine_gen.h"
namespace mongo {
namespace serverless {
/**
* @returns A list of `MemberConfig` for member nodes which match a provided replica set tag name
*/
std::vector<repl::MemberConfig> getRecipientMembers(const repl::ReplSetConfig& config,
const StringData& recipientTagName);
/**
* Builds a connection string for a shard split recipient by filtering local member nodes by
* `recipientTagName`. The `recipientSetName` is the `replSet` parameter of the recipient
* connection string.
*/
ConnectionString makeRecipientConnectionString(const repl::ReplSetConfig& config,
const StringData& recipientTagName,
const StringData& recipientSetName);
/**
* Builds a split config, which is a ReplSetConfig with a subdocument identifying a recipient config
* to be applied to a recipient shard during a shard split operation. The `recipientTagName` is used
* to filter the local member list for recipient nodes. The `recipientSetName` is used to validate
* that we are indeed generating a config for a recipient set with a new name.
*/
repl::ReplSetConfig makeSplitConfig(const repl::ReplSetConfig& config,
const std::string& recipientSetName,
const std::string& recipientTagName);
/**
* Inserts the shard split state document 'stateDoc' into
* 'config.shardSplitDonors' collection. Also, creates the collection if not present
* before inserting the document.
*
* NOTE: A state doc might get inserted based on a decision made out of a stale read within a
* storage transaction. Callers are expected to have their own concurrency mechanism to handle
* write skew problem.
*
* @Returns 'ConflictingOperationInProgress' error code if an active shard split op found for the
* given state doc id provided in the 'stateDoc'.
*
* Throws 'DuplicateKey' error code if a document already exists on the disk with the same
* shardSplitId, irrespective of the document marked for garbage collect or not.
*/
Status insertStateDoc(OperationContext* opCtx, const ShardSplitDonorDocument& stateDoc);
/**
* Updates the shard split state doc in the database.
*
* Returns 'NoSuchKey' error code if no state document already exists on the disk with the same
* shardSplitId.
*/
Status updateStateDoc(OperationContext* opCtx, const ShardSplitDonorDocument& stateDoc);
/**
* Deletes a state documents in the database for a recipient if the state is blocking at startup.
*
* Returns 'NamespaceNotFound' if no matching namespace is found. Returns true if the doc was
* removed.
*/
StatusWith<bool> deleteStateDoc(OperationContext* opCtx, const UUID& shardSplitId);
/**
* Returns true if the state document should be removed for a shard split recipient which is based
* on having a local state doc in kBlocking state and having matching recipientSetName matching the
* config.replSetName.
*/
bool shouldRemoveStateDocumentOnRecipient(OperationContext* opCtx,
const ShardSplitDonorDocument& stateDocument);
/**
* Returns StatusWith true if the validation succeeds otherwise returns different error status with
* the proper error causing the failure.
*/
Status validateRecipientNodesForShardSplit(const ShardSplitDonorDocument& stateDocument,
const repl::ReplSetConfig& localConfig);
/**
* Listener that receives heartbeat events and fulfills a future once it sees the expected number
* of nodes in the recipient replica set to monitor.
*/
class RecipientAcceptSplitListener : public sdam::TopologyListener {
public:
RecipientAcceptSplitListener(const ConnectionString& recipientConnectionString);
void onServerHeartbeatSucceededEvent(const HostAndPort& hostAndPort, BSONObj reply) final;
// Fulfilled when all nodes have accepted the split.
SharedSemiFuture<HostAndPort> getSplitAcceptedFuture() const;
private:
mutable Mutex _mutex =
MONGO_MAKE_LATCH("ShardSplitDonorService::getRecipientAcceptSplitFuture::_mutex");
bool _fulfilled{false};
const size_t _numberOfRecipient;
std::string _recipientSetName;
stdx::unordered_map<HostAndPort, repl::OpTimeWith<std::string>> _reportedSetNames;
SharedPromise<HostAndPort> _promise;
};
} // namespace serverless
} // namespace mongo
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