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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 <boost/optional.hpp>
#include <vector>
#include "mongo/bson/bsonobj.h"
#include "mongo/db/catalog/collection_catalog.h"
#include "mongo/db/exec/document_value/document.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/s/shard_filtering_metadata_refresh.h"
#include "mongo/s/resharding/common_types_gen.h"
#include "mongo/util/functional.h"
namespace mongo {
class NamespaceString;
class OperationContext;
class Pipeline;
namespace resharding::data_copy {
/**
* Creates the specified collection with the given options if the collection does not already exist.
* If the collection already exists, we do not compare the options because the resharding process
* will always use the same options for the same namespace.
*/
void ensureCollectionExists(OperationContext* opCtx,
const NamespaceString& nss,
const CollectionOptions& options);
/**
* Drops the specified collection or returns without error if the collection has already been
* dropped. A particular incarnation of the collection can be dropped by specifying its UUID.
*
* This functions assumes the collection being dropped doesn't have any two-phase index builds
* active on it.
*/
void ensureCollectionDropped(OperationContext* opCtx,
const NamespaceString& nss,
const boost::optional<CollectionUUID>& uuid = boost::none);
/**
* Removes documents from the oplog applier progress and transaction applier progress collections
* that are associated with an in-progress resharding operation. Also drops all oplog buffer
* collections and conflict stash collections that are associated with the in-progress resharding
* operation.
*/
void ensureOplogCollectionsDropped(OperationContext* opCtx,
const UUID& reshardingUUID,
const UUID& sourceUUID,
const std::vector<DonorShardFetchTimestamp>& donorShards);
/**
* Renames the temporary resharding collection to the source namespace string, or is a no-op if the
* collection has already been renamed to it.
*
* This function throws an exception if the collection doesn't exist as the temporary resharding
* namespace string or the source namespace string.
*/
void ensureTemporaryReshardingCollectionRenamed(OperationContext* opCtx,
const CommonReshardingMetadata& metadata);
/**
* Returns the largest _id value in the collection.
*/
Value findHighestInsertedId(OperationContext* opCtx, const CollectionPtr& collection);
/**
* Returns the full document of the largest _id value in the collection.
*/
boost::optional<Document> findDocWithHighestInsertedId(OperationContext* opCtx,
const CollectionPtr& collection);
/**
* Returns a batch of documents suitable for being inserted with insertBatch().
*
* The batch of documents is returned once its size exceeds batchSizeLimitBytes or the pipeline has
* been exhausted.
*/
std::vector<InsertStatement> fillBatchForInsert(Pipeline& pipeline, int batchSizeLimitBytes);
/**
* Atomically inserts a batch of documents in a single storage transaction. Returns the number of
* bytes inserted.
*
* Throws NamespaceNotFound if the collection doesn't already exist.
*/
int insertBatch(OperationContext* opCtx,
const NamespaceString& nss,
std::vector<InsertStatement>& batch);
/**
* Checks out the logical session and acts in one of the following ways depending on the state of
* this shard's config.transactions table:
*
* (a) When this shard already knows about a higher transaction than txnNumber,
* withSessionCheckedOut() skips calling the supplied lambda function and returns boost::none.
*
* (b) When this shard already knows about the retryable write statement (txnNumber, *stmtId),
* withSessionCheckedOut() skips calling the supplied lambda function and returns boost::none.
*
* (c) When this shard has an earlier prepared transaction still active, withSessionCheckedOut()
* skips calling the supplied lambda function and returns a future that becomes ready once the
* active prepared transaction on this shard commits or aborts. After waiting for the returned
* future to become ready, the caller should then invoke withSessionCheckedOut() with the same
* arguments a second time.
*
* (d) Otherwise, withSessionCheckedOut() calls the lambda function and returns boost::none.
*/
boost::optional<SharedSemiFuture<void>> withSessionCheckedOut(OperationContext* opCtx,
LogicalSessionId lsid,
TxnNumber txnNumber,
boost::optional<StmtId> stmtId,
unique_function<void()> callable);
/**
* Updates this shard's config.transactions table based on a retryable write or multi-statement
* transaction that already executed on some donor shard.
*
* This function assumes it is being called while the corresponding logical session is checked out
* by the supplied OperationContext.
*/
void updateSessionRecord(OperationContext* opCtx,
BSONObj o2Field,
std::vector<StmtId> stmtIds,
boost::optional<repl::OpTime> preImageOpTime,
boost::optional<repl::OpTime> postImageOpTime);
/**
* Calls and returns the value from the supplied lambda function.
*
* If a StaleConfig exception is thrown during its execution, then this function will attempt to
* refresh the collection and invoke the supplied lambda function a second time.
*/
template <typename Callable>
auto withOneStaleConfigRetry(OperationContext* opCtx, Callable&& callable) {
try {
return callable();
} catch (const ExceptionForCat<ErrorCategory::StaleShardVersionError>& ex) {
if (auto sce = ex.extraInfo<StaleConfigInfo>()) {
const auto refreshed =
onShardVersionMismatchNoExcept(opCtx, sce->getNss(), sce->getVersionReceived())
.isOK();
if (refreshed) {
return callable();
}
}
throw;
}
}
} // namespace resharding::data_copy
} // namespace mongo
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