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Diffstat (limited to 'src/mongo/db/pipeline/document_source_internal_shardserver_info.h')
| -rw-r--r-- | src/mongo/db/pipeline/document_source_internal_shardserver_info.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/mongo/db/pipeline/document_source_internal_shardserver_info.h b/src/mongo/db/pipeline/document_source_internal_shardserver_info.h new file mode 100644 index 00000000000..5a1cbaa8f63 --- /dev/null +++ b/src/mongo/db/pipeline/document_source_internal_shardserver_info.h @@ -0,0 +1,109 @@ +/** + * Copyright (C) 2023-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/document_source.h" + +namespace mongo { + +/** + * An internal stage available for testing. Gets the host and shard name for every shard server in + * the cluster. + */ +class DocumentSourceInternalShardServerInfo final : public DocumentSource { +public: + class LiteParsed : public LiteParsedDocumentSource { + public: + static std::unique_ptr<LiteParsed> parse(const NamespaceString& nss, + const BSONElement& spec) { + return std::make_unique<LiteParsed>(spec.fieldName()); + } + + LiteParsed(std::string parseTimeName) + : LiteParsedDocumentSource(std::move(parseTimeName)) {} + + stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const final { + return stdx::unordered_set<NamespaceString>(); + } + + PrivilegeVector requiredPrivileges(bool isMongos, + bool bypassDocumentValidation) const final { + return {}; + } + + bool allowedToPassthroughFromMongos() const final { + return false; + } + }; + + static constexpr StringData kStageName = "$_internalShardServerInfo"_sd; + + static boost::intrusive_ptr<DocumentSource> createFromBson( + BSONElement, const boost::intrusive_ptr<ExpressionContext>&); + + static boost::intrusive_ptr<DocumentSource> create( + const boost::intrusive_ptr<ExpressionContext>& expCtx) { + return new DocumentSourceInternalShardServerInfo(expCtx); + } + + const char* getSourceName() const final { + return kStageName.rawData(); + } + + boost::optional<DistributedPlanLogic> distributedPlanLogic() final { + return boost::none; + } + + StageConstraints constraints(Pipeline::SplitState pipeState) const final { + StageConstraints constraints{StreamType::kStreaming, + PositionRequirement::kFirst, + HostTypeRequirement::kAllShardServers, + DiskUseRequirement::kNoDiskUse, + FacetRequirement::kNotAllowed, + TransactionRequirement::kNotAllowed, + LookupRequirement::kNotAllowed, + UnionRequirement::kAllowed}; + constraints.isIndependentOfAnyCollection = true; + constraints.requiresInputDocSource = false; + return constraints; + } + +private: + DocumentSourceInternalShardServerInfo(const boost::intrusive_ptr<ExpressionContext>& expCtx) + : DocumentSource(kStageName, expCtx) {} + + GetNextResult doGetNext() final; + + Value serialize(const SerializationOptions& opts = SerializationOptions{}) const final override; + + bool _didEmit = false; +}; + +} // namespace mongo |
