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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/db/catalog/drop_collection.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/executor/task_executor.h"
#include "mongo/s/async_requests_sender.h"
#include "mongo/s/catalog/type_collection.h"
#include "mongo/s/request_types/sharded_ddl_commands_gen.h"
namespace mongo {
namespace sharding_ddl_util {
/**
* Creates a barrier after which we are guaranteed that all writes to the config server performed by
* the previous primary have been majority commited and will be seen by the new primary.
*/
void linearizeCSRSReads(OperationContext* opCtx);
/**
* Generic utility to send a command to a list of shards. Throws if one of the commands fails.
*/
std::vector<AsyncRequestsSender::Response> sendAuthenticatedCommandToShards(
OperationContext* opCtx,
StringData dbName,
const BSONObj& command,
const std::vector<ShardId>& shardIds,
const std::shared_ptr<executor::TaskExecutor>& executor);
/**
* Erase tags metadata from config server for the given namespace, using the _configsvrRemoveTags
* command as a retryable write to ensure idempotency.
*/
void removeTagsMetadataFromConfig(OperationContext* opCtx,
const NamespaceString& nss,
const OperationSessionInfo& osi);
/**
* Erase tags metadata from config server for the given namespace.
*/
void removeTagsMetadataFromConfig_notIdempotent(OperationContext* opCtx,
const NamespaceString& nss,
const WriteConcernOptions& writeConcern);
/**
* Erase collection metadata from config server and invalidate the locally cached one.
* In particular remove the collection and chunks metadata associated with the given namespace.
*/
void removeCollAndChunksMetadataFromConfig(OperationContext* opCtx,
const CollectionType& coll,
const WriteConcernOptions& writeConcern);
/**
* Erase collection metadata from config server and invalidate the locally cached one.
* In particular remove the collection and chunks metadata associated with the given namespace.
*
* Returns true if the collection existed before being removed.
*/
bool removeCollAndChunksMetadataFromConfig_notIdempotent(OperationContext* opCtx,
const NamespaceString& nss,
const WriteConcernOptions& writeConcern);
/**
* Rename sharded collection metadata as part of a renameCollection operation.
*
* - Update namespace associated with tags (FROM -> TO)
* - Update FROM collection entry to TO
*
* This function is idempotent and can just be invoked by the CSRS.
*/
void shardedRenameMetadata(OperationContext* opCtx,
CollectionType& fromCollType,
const NamespaceString& toNss,
const WriteConcernOptions& writeConcern);
/**
* Ensures rename preconditions for collections are met:
* - Check that the namespace of the destination collection is not too long
* - Check that `dropTarget` is true if the destination collection exists
* - Check that no tags exist for the destination collection
*/
void checkRenamePreconditions(OperationContext* opCtx,
bool sourceIsSharded,
const NamespaceString& toNss,
bool dropTarget);
/**
* Throws if the DB primary shards of the provided namespaces differs.
*
* Optimistically assume that no movePrimary is performed during the check: it's currently not
* possible to ensure primary shard stability for both databases.
*/
void checkDbPrimariesOnTheSameShard(OperationContext* opCtx,
const NamespaceString& fromNss,
const NamespaceString& toNss);
/**
* Throws an exception if the collection is already sharded with different options.
*
* If the collection is already sharded with the same options, returns the existing collection's
* full spec, else returns boost::none.
*/
boost::optional<CreateCollectionResponse> checkIfCollectionAlreadySharded(
OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& key,
const BSONObj& collation,
bool unique);
/**
* Stops ongoing migrations and prevents future ones to start for the given nss.
* If expectedCollectionUUID is set and doesn't match that of that collection, then this is a no-op.
* If expectedCollectionUUID is not set, no UUID check will be performed before stopping migrations.
*/
void stopMigrations(OperationContext* opCtx,
const NamespaceString& nss,
const boost::optional<UUID>& expectedCollectionUUID);
/**
* Resume migrations and balancing rounds for the given nss.
* If expectedCollectionUUID is set and doesn't match that of the collection, then this is a no-op.
* If expectedCollectionUUID is not set, no UUID check will be performed before resuming migrations.
*/
void resumeMigrations(OperationContext* opCtx,
const NamespaceString& nss,
const boost::optional<UUID>& expectedCollectionUUID);
/*
* Returns the UUID of the collection (if exists) using the catalog. It does not provide any locking
* guarantees after the call.
**/
boost::optional<UUID> getCollectionUUID(OperationContext* opCtx,
const NamespaceString& nss,
bool allowViews = false);
/*
* Performs a noop retryable write on the given shards using the session and txNumber specified in
* 'osi'
*/
void performNoopRetryableWriteOnShards(OperationContext* opCtx,
const std::vector<ShardId>& shardIds,
const OperationSessionInfo& osi,
const std::shared_ptr<executor::TaskExecutor>& executor);
/*
* Performs a noop write locally with majority write concern.
*/
void performNoopMajorityWriteLocally(OperationContext* opCtx);
/**
* Sends the _shardsvrDropCollectionParticipant command to the specified shards.
*/
void sendDropCollectionParticipantCommandToShards(OperationContext* opCtx,
const NamespaceString& nss,
const std::vector<ShardId>& shardIds,
std::shared_ptr<executor::TaskExecutor> executor,
const OperationSessionInfo& osi);
BSONObj getCriticalSectionReasonForRename(const NamespaceString& from, const NamespaceString& to);
} // namespace sharding_ddl_util
} // namespace mongo
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