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/**
* Copyright (C) 2018-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/exec/shard_filterer.h"
#include "mongo/db/pipeline/mongo_process_common.h"
#include "mongo/db/pipeline/pipeline.h"
#include "mongo/s/async_requests_sender.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/query/cluster_aggregation_planner.h"
#include "mongo/s/query/owned_remote_cursor.h"
namespace mongo {
/**
* Class to provide access to mongos-specific implementations of methods required by some
* document sources.
*/
class MongoSInterface : public MongoProcessCommon {
public:
static BSONObj createPassthroughCommandForShard(OperationContext* opCtx,
const AggregationRequest& request,
const boost::optional<ShardId>& shardId,
Pipeline* pipeline,
BSONObj collationObj);
/**
* Appends information to the command sent to the shards which should be appended both if this
* is a passthrough sent to a single shard and if this is a split pipeline.
*/
static BSONObj genericTransformForShards(MutableDocument&& cmdForShards,
OperationContext* opCtx,
const boost::optional<ShardId>& shardId,
const AggregationRequest& request,
BSONObj collationObj);
static BSONObj createCommandForTargetedShards(
OperationContext* opCtx,
const AggregationRequest& request,
const LiteParsedPipeline& litePipe,
const cluster_aggregation_planner::SplitPipeline& splitPipeline,
const BSONObj collationObj,
const boost::optional<cluster_aggregation_planner::ShardedExchangePolicy> exchangeSpec,
bool needsMerge);
static StatusWith<CachedCollectionRoutingInfo> getExecutionNsRoutingInfo(
OperationContext* opCtx, const NamespaceString& execNss);
MongoSInterface() = default;
virtual ~MongoSInterface() = default;
void setOperationContext(OperationContext* opCtx) final {}
boost::optional<Document> lookupSingleDocument(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& nss,
UUID collectionUUID,
const Document& documentKey,
boost::optional<BSONObj> readConcern,
bool allowSpeculativeMajorityRead = false) final;
std::vector<GenericCursor> getIdleCursors(const boost::intrusive_ptr<ExpressionContext>& expCtx,
CurrentOpUserMode userMode) const final;
std::unique_ptr<TransactionHistoryIteratorBase> createTransactionHistoryIterator(
repl::OpTime time) const override {
MONGO_UNREACHABLE;
}
DBClientBase* directClient() final {
MONGO_UNREACHABLE;
}
bool isSharded(OperationContext* opCtx, const NamespaceString& nss) final;
Status insert(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
std::vector<BSONObj>&& objs,
const WriteConcernOptions& wc,
boost::optional<OID>) final {
MONGO_UNREACHABLE;
}
StatusWith<UpdateResult> update(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
BatchedObjects&& batch,
const WriteConcernOptions& wc,
bool upsert,
bool multi,
boost::optional<OID>) final {
MONGO_UNREACHABLE;
}
CollectionIndexUsageMap getIndexStats(OperationContext* opCtx,
const NamespaceString& ns) final {
MONGO_UNREACHABLE;
}
void appendLatencyStats(OperationContext* opCtx,
const NamespaceString& nss,
bool includeHistograms,
BSONObjBuilder* builder) const final {
MONGO_UNREACHABLE;
}
Status appendStorageStats(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& param,
BSONObjBuilder* builder) const final {
MONGO_UNREACHABLE;
}
Status appendRecordCount(OperationContext* opCtx,
const NamespaceString& nss,
BSONObjBuilder* builder) const final {
MONGO_UNREACHABLE;
}
Status appendQueryExecStats(OperationContext* opCtx,
const NamespaceString& nss,
BSONObjBuilder* builder) const final {
MONGO_UNREACHABLE;
}
BSONObj getCollectionOptions(const NamespaceString& nss) final {
MONGO_UNREACHABLE;
}
void renameIfOptionsAndIndexesHaveNotChanged(OperationContext* opCtx,
const BSONObj& renameCommandObj,
const NamespaceString& targetNs,
const BSONObj& originalCollectionOptions,
const std::list<BSONObj>& originalIndexes) final {
MONGO_UNREACHABLE;
}
std::unique_ptr<Pipeline, PipelineDeleter> attachCursorSourceToPipeline(
const boost::intrusive_ptr<ExpressionContext>& expCtx, Pipeline* pipeline) final;
std::unique_ptr<Pipeline, PipelineDeleter> attachCursorSourceToPipelineForLocalRead(
const boost::intrusive_ptr<ExpressionContext>& expCtx, Pipeline* pipeline) final {
// It is not meaningful to perform a "local read" on mongos.
MONGO_UNREACHABLE;
}
std::unique_ptr<ShardFilterer> getShardFilterer(
const boost::intrusive_ptr<ExpressionContext>& expCtx) const override {
return nullptr;
}
std::string getShardName(OperationContext* opCtx) const final {
MONGO_UNREACHABLE;
}
std::pair<std::vector<FieldPath>, bool> collectDocumentKeyFieldsForHostedCollection(
OperationContext* opCtx, const NamespaceString&, UUID) const final {
MONGO_UNREACHABLE;
}
std::unique_ptr<Pipeline, PipelineDeleter> makePipeline(
const std::vector<BSONObj>& rawPipeline,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const MakePipelineOptions pipelineOptions) final;
/**
* The following methods only make sense for data-bearing nodes and should never be called on
* a mongos.
*/
BackupCursorState openBackupCursor(OperationContext* opCtx) final {
MONGO_UNREACHABLE;
}
void closeBackupCursor(OperationContext* opCtx, const UUID& backupId) final {
MONGO_UNREACHABLE;
}
BackupCursorExtendState extendBackupCursor(OperationContext* opCtx,
const UUID& backupId,
const Timestamp& extendTo) final {
MONGO_UNREACHABLE;
}
/**
* Mongos does not have a plan cache, so this method should never be called on mongos. Upstream
* checks are responsible for generating an error if a user attempts to introspect the plan
* cache on mongos.
*/
std::vector<BSONObj> getMatchingPlanCacheEntryStats(OperationContext*,
const NamespaceString&,
const MatchExpression*) const final {
MONGO_UNREACHABLE;
}
bool fieldsHaveSupportingUniqueIndex(const boost::intrusive_ptr<ExpressionContext>&,
const NamespaceString&,
const std::set<FieldPath>& fieldPaths) const;
void checkRoutingInfoEpochOrThrow(const boost::intrusive_ptr<ExpressionContext>&,
const NamespaceString&,
ChunkVersion) const final {
MONGO_UNREACHABLE;
}
std::unique_ptr<ResourceYielder> getResourceYielder() const override {
return nullptr;
}
std::pair<std::set<FieldPath>, boost::optional<ChunkVersion>>
ensureFieldsUniqueOrResolveDocumentKey(const boost::intrusive_ptr<ExpressionContext>& expCtx,
boost::optional<std::vector<std::string>> fields,
boost::optional<ChunkVersion> targetCollectionVersion,
const NamespaceString& outputNs) const override;
std::pair<JsExecution*, bool> getJsExec(const BSONObj&) override {
// Javascript engine is not support on mongos.
MONGO_UNREACHABLE;
}
void releaseJsExec() override {}
protected:
BSONObj _reportCurrentOpForClient(OperationContext* opCtx,
Client* client,
CurrentOpTruncateMode truncateOps,
CurrentOpBacktraceMode backtraceMode) const final;
void _reportCurrentOpsForIdleSessions(OperationContext* opCtx,
CurrentOpUserMode userMode,
std::vector<BSONObj>* ops) const final;
};
} // namespace mongo
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