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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/pipeline/pipeline.h"
#include "mongo/db/pipeline/process_interface/common_mongod_process_interface.h"
#include "mongo/s/catalog_cache.h"
namespace mongo {
/**
* Specialized version of the MongoDInterface when this node is a shard server.
*/
class ShardServerProcessInterface final : public CommonMongodProcessInterface {
public:
using CommonMongodProcessInterface::CommonMongodProcessInterface;
ShardServerProcessInterface(OperationContext* opCtx,
std::shared_ptr<executor::TaskExecutor> executor);
/**
* Note: Cannot be called while holding a lock. Refreshes from the config servers if the
* metadata for the given namespace does not exist. Otherwise, will not automatically refresh,
* so the answer may be stale or become stale after calling. Caller should always attach
* shardVersion when sending request against nss based on this information.
*/
bool isSharded(OperationContext* opCtx, const NamespaceString& nss) final;
void checkRoutingInfoEpochOrThrow(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& nss,
ChunkVersion targetCollectionVersion) const final;
std::pair<std::vector<FieldPath>, bool> collectDocumentKeyFieldsForHostedCollection(
OperationContext* opCtx, const NamespaceString&, UUID) const final;
std::vector<FieldPath> collectDocumentKeyFieldsActingAsRouter(
OperationContext*, const NamespaceString&) const final {
// We don't expect anyone to use this method on the shard itself (yet). This is currently
// only used for $merge. For $out in a sharded cluster, the mongos is responsible for
// collecting the document key fields before serializing them and sending them to the
// shards. This is logically a MONGO_UNREACHABLE, but a malicious user could construct a
// request to send directly to the shards which does not include the uniqueKey, so we must
// be prepared to gracefully error.
uasserted(50997, "Unexpected attempt to consult catalog cache on a shard server");
}
boost::optional<Document> lookupSingleDocument(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& nss,
UUID collectionUUID,
const Document& documentKey,
boost::optional<BSONObj> readConcern) final;
/**
* Inserts the documents 'objs' into the namespace 'ns' using the ClusterWriter for locking,
* routing, stale config handling, etc.
*/
Status insert(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
std::vector<BSONObj>&& objs,
const WriteConcernOptions& wc,
boost::optional<OID> targetEpoch) final;
/**
* Replaces the documents matching 'queries' with 'updates' using the ClusterWriter for locking,
* routing, stale config handling, etc.
*/
StatusWith<UpdateResult> update(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
BatchedObjects&& batch,
const WriteConcernOptions& wc,
UpsertType upsert,
bool multi,
boost::optional<OID> targetEpoch) final;
BSONObj preparePipelineAndExplain(Pipeline* ownedPipeline,
ExplainOptions::Verbosity verbosity) final;
std::unique_ptr<ShardFilterer> getShardFilterer(
const boost::intrusive_ptr<ExpressionContext>& expCtx) const override final;
BSONObj getCollectionOptions(OperationContext* opCtx, const NamespaceString& nss) final;
std::list<BSONObj> getIndexSpecs(OperationContext* opCtx,
const NamespaceString& ns,
bool includeBuildUUIDs) final;
void renameIfOptionsAndIndexesHaveNotChanged(OperationContext* opCtx,
const BSONObj& renameCommandObj,
const NamespaceString& targetNs,
const BSONObj& originalCollectionOptions,
const std::list<BSONObj>& originalIndexes) final;
void createCollection(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& cmdObj) final;
void createIndexesOnEmptyCollection(OperationContext* opCtx,
const NamespaceString& ns,
const std::vector<BSONObj>& indexSpecs) final;
void dropCollection(OperationContext* opCtx, const NamespaceString& collection) final;
/**
* If 'allowTargetingShards' is true, splits the pipeline and dispatch half to the shards,
* leaving the merging half executing in this process after attaching a $mergeCursors. Will
* retry on network errors and also on StaleConfig errors to avoid restarting the entire
* operation.
*/
std::unique_ptr<Pipeline, PipelineDeleter> attachCursorSourceToPipeline(
Pipeline* pipeline,
ShardTargetingPolicy shardTargetingPolicy = ShardTargetingPolicy::kAllowed,
boost::optional<BSONObj> readConcern = boost::none) final;
void setExpectedShardVersion(OperationContext* opCtx,
const NamespaceString& nss,
boost::optional<ChunkVersion> chunkVersion) final;
bool setExpectedDbVersion(OperationContext* opCtx,
const NamespaceString& nss,
DatabaseVersion dbVersion) final;
void unsetExpectedDbVersion(OperationContext* opCtx, const NamespaceString& nss) final;
void checkOnPrimaryShardForDb(OperationContext* opCtx, const NamespaceString& nss) final;
private:
// If the current operation is versioned, then we attach the DB version to the command object;
// otherwise, it is returned unmodified. Used when running internal commands, as the parent
// operation may be unversioned if run by a client connecting directly to the shard. If a shard
// version is supplied it will be set on the command, otherwise no shard version is attached.
// This allows sub-operations to set a version where necessary (e.g. to enforce that only
// unsharded collections can be renamed) while omitting it in cases where it is not relevant
// (e.g. obtaining a list of indexes for a collection that may be sharded or unsharded).
BSONObj _versionCommandIfAppropriate(BSONObj cmdObj,
const CachedDatabaseInfo& cachedDbInfo,
boost::optional<ChunkVersion> shardVersion = boost::none);
// Records whether the initial operation which creates this MongoProcessInterface is versioned.
// We want to avoid applying versions to sub-operations in cases where the client has connected
// directly to a shard. Since getMores are never versioned, we must retain the versioning state
// of the original operation so that we can decide whether we should version sub-operations
// across the entire lifetime of the pipeline that owns this MongoProcessInterface.
bool _opIsVersioned = false;
};
} // namespace mongo
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