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+/**
+ * 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