SERVER-39396 Move stub mongo process interface with mocked lookupSingleDocument to shared place

4 files changed, 174 insertions, 74 deletions

diff --git a/src/mongo/db/pipeline/SConscript b/src/mongo/db/pipeline/SConscript
index d8cd37fe5a3..37c2eee8a0d 100644
--- a/src/mongo/db/pipeline/SConscript
+++ b/src/mongo/db/pipeline/SConscript
@@ -188,6 +188,7 @@ env.Library(
     target='document_source_mock',
     source=[
         'document_source_mock.cpp',
+        'stub_mongo_process_interface_lookup_single_document.cpp',
         ],
     LIBDEPS=[
         '$BUILD_DIR/mongo/db/query/query_test_service_context',
diff --git a/src/mongo/db/pipeline/document_source_lookup_change_post_image_test.cpp b/src/mongo/db/pipeline/document_source_lookup_change_post_image_test.cpp
index 723ddc186ba..32ce6ebce8f 100644
--- a/src/mongo/db/pipeline/document_source_lookup_change_post_image_test.cpp
+++ b/src/mongo/db/pipeline/document_source_lookup_change_post_image_test.cpp
@@ -43,7 +43,7 @@
 #include "mongo/db/pipeline/document_source_mock.h"
 #include "mongo/db/pipeline/document_value_test_util.h"
 #include "mongo/db/pipeline/field_path.h"
-#include "mongo/db/pipeline/stub_mongo_process_interface.h"
+#include "mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.h"
 #include "mongo/db/pipeline/value.h"
 
 namespace mongo {
@@ -52,6 +52,8 @@ using boost::intrusive_ptr;
 using std::deque;
 using std::vector;
 
+using MockMongoInterface = StubMongoProcessInterfaceLookupSingleDocument;
+
 // This provides access to getExpCtx(), but we'll use a different name for this test suite.
 class DocumentSourceLookupChangePostImageTest : public AggregationContextFixture {
 public:
@@ -76,79 +78,6 @@ public:
     }
 };
 
-/**
- * A mock MongoProcessInterface which allows mocking a foreign pipeline.
- */
-class MockMongoInterface final : public StubMongoProcessInterface {
-public:
-    MockMongoInterface(deque<DocumentSource::GetNextResult> mockResults)
-        : _mockResults(std::move(mockResults)) {}
-
-    bool isSharded(OperationContext* opCtx, const NamespaceString& nss) final {
-        return false;
-    }
-
-    std::unique_ptr<Pipeline, PipelineDeleter> makePipeline(
-        const std::vector<BSONObj>& rawPipeline,
-        const boost::intrusive_ptr<ExpressionContext>& expCtx,
-        const MakePipelineOptions opts = MakePipelineOptions{}) final {
-        auto pipeline = uassertStatusOK(Pipeline::parse(rawPipeline, expCtx));
-
-        if (opts.optimize) {
-            pipeline->optimizePipeline();
-        }
-
-        if (opts.attachCursorSource) {
-            pipeline = attachCursorSourceToPipeline(expCtx, pipeline.release());
-        }
-
-        return pipeline;
-    }
-
-    std::unique_ptr<Pipeline, PipelineDeleter> attachCursorSourceToPipeline(
-        const boost::intrusive_ptr<ExpressionContext>& expCtx, Pipeline* ownedPipeline) final {
-        std::unique_ptr<Pipeline, PipelineDeleter> pipeline(ownedPipeline,
-                                                            PipelineDeleter(expCtx->opCtx));
-        pipeline->addInitialSource(DocumentSourceMock::create(_mockResults));
-        return pipeline;
-    }
-
-    boost::optional<Document> lookupSingleDocument(
-        const boost::intrusive_ptr<ExpressionContext>& expCtx,
-        const NamespaceString& nss,
-        UUID collectionUUID,
-        const Document& documentKey,
-        boost::optional<BSONObj> readConcern,
-        bool allowSpeculativeMajorityRead) {
-        // The namespace 'nss' may be different than the namespace on the ExpressionContext in the
-        // case of a change stream on a whole database so we need to make a copy of the
-        // ExpressionContext with the new namespace.
-        auto foreignExpCtx = expCtx->copyWith(nss, collectionUUID, boost::none);
-        std::unique_ptr<Pipeline, PipelineDeleter> pipeline;
-        try {
-            pipeline = makePipeline({BSON("$match" << documentKey)}, foreignExpCtx);
-        } catch (ExceptionFor<ErrorCodes::NamespaceNotFound>&) {
-            return boost::none;
-        }
-
-        auto lookedUpDocument = pipeline->getNext();
-        if (auto next = pipeline->getNext()) {
-            uasserted(ErrorCodes::TooManyMatchingDocuments,
-                      str::stream() << "found more than one document matching "
-                                    << documentKey.toString()
-                                    << " ["
-                                    << lookedUpDocument->toString()
-                                    << ", "
-                                    << next->toString()
-                                    << "]");
-        }
-        return lookedUpDocument;
-    }
-
-private:
-    deque<DocumentSource::GetNextResult> _mockResults;
-};
-
 TEST_F(DocumentSourceLookupChangePostImageTest, ShouldErrorIfMissingDocumentKeyOnUpdate) {
     auto expCtx = getExpCtx();
 
diff --git a/src/mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.cpp b/src/mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.cpp
new file mode 100644
index 00000000000..6af0f29d207
--- /dev/null
+++ b/src/mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.cpp
@@ -0,0 +1,99 @@
+/**
+ *    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.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.h"
+
+#include "mongo/db/pipeline/document_source.h"
+#include "mongo/db/pipeline/document_source_mock.h"
+#include "mongo/util/assert_util.h"
+
+namespace mongo {
+
+std::unique_ptr<Pipeline, PipelineDeleter>
+StubMongoProcessInterfaceLookupSingleDocument::makePipeline(
+    const std::vector<BSONObj>& rawPipeline,
+    const boost::intrusive_ptr<ExpressionContext>& expCtx,
+    const MakePipelineOptions opts) {
+    auto pipeline = uassertStatusOK(Pipeline::parse(rawPipeline, expCtx));
+
+    if (opts.optimize) {
+        pipeline->optimizePipeline();
+    }
+
+    if (opts.attachCursorSource) {
+        pipeline = attachCursorSourceToPipeline(expCtx, pipeline.release());
+    }
+
+    return pipeline;
+}
+
+std::unique_ptr<Pipeline, PipelineDeleter>
+StubMongoProcessInterfaceLookupSingleDocument::attachCursorSourceToPipeline(
+    const boost::intrusive_ptr<ExpressionContext>& expCtx, Pipeline* ownedPipeline) {
+    std::unique_ptr<Pipeline, PipelineDeleter> pipeline(ownedPipeline,
+                                                        PipelineDeleter(expCtx->opCtx));
+    pipeline->addInitialSource(DocumentSourceMock::create(_mockResults));
+    return pipeline;
+}
+
+boost::optional<Document> StubMongoProcessInterfaceLookupSingleDocument::lookupSingleDocument(
+    const boost::intrusive_ptr<ExpressionContext>& expCtx,
+    const NamespaceString& nss,
+    UUID collectionUUID,
+    const Document& documentKey,
+    boost::optional<BSONObj> readConcern,
+    bool allowSpeculativeMajorityRead) {
+    // The namespace 'nss' may be different than the namespace on the ExpressionContext in the
+    // case of a change stream on a whole database so we need to make a copy of the
+    // ExpressionContext with the new namespace.
+    auto foreignExpCtx = expCtx->copyWith(nss, collectionUUID, boost::none);
+    std::unique_ptr<Pipeline, PipelineDeleter> pipeline;
+    try {
+        pipeline = makePipeline({BSON("$match" << documentKey)}, foreignExpCtx);
+    } catch (ExceptionFor<ErrorCodes::NamespaceNotFound>&) {
+        return boost::none;
+    }
+
+    auto lookedUpDocument = pipeline->getNext();
+    if (auto next = pipeline->getNext()) {
+        uasserted(ErrorCodes::TooManyMatchingDocuments,
+                  str::stream() << "found more than one document matching "
+                                << documentKey.toString()
+                                << " ["
+                                << lookedUpDocument->toString()
+                                << ", "
+                                << next->toString()
+                                << "]");
+    }
+    return lookedUpDocument;
+}
+
+}  // namespace mongo
diff --git a/src/mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.h b/src/mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.h
new file mode 100644
index 00000000000..089d38b2908
--- /dev/null
+++ b/src/mongo/db/pipeline/stub_mongo_process_interface_lookup_single_document.h
@@ -0,0 +1,71 @@
+/**
+ *    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 <boost/intrusive_ptr.hpp>
+#include <deque>
+#include <vector>
+
+#include "mongo/db/pipeline/document.h"
+#include "mongo/db/pipeline/document_source.h"
+#include "mongo/db/pipeline/pipeline.h"
+#include "mongo/db/pipeline/stub_mongo_process_interface.h"
+
+namespace mongo {
+
+/**
+ * A mock MongoProcessInterface which allows mocking a foreign pipeline.
+ */
+class StubMongoProcessInterfaceLookupSingleDocument final : public StubMongoProcessInterface {
+public:
+    StubMongoProcessInterfaceLookupSingleDocument(
+        std::deque<DocumentSource::GetNextResult> mockResults)
+        : _mockResults(std::move(mockResults)) {}
+
+    std::unique_ptr<Pipeline, PipelineDeleter> makePipeline(
+        const std::vector<BSONObj>& rawPipeline,
+        const boost::intrusive_ptr<ExpressionContext>& expCtx,
+        const MakePipelineOptions opts = MakePipelineOptions{}) final;
+
+    std::unique_ptr<Pipeline, PipelineDeleter> attachCursorSourceToPipeline(
+        const boost::intrusive_ptr<ExpressionContext>& expCtx, Pipeline* ownedPipeline) 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);
+
+private:
+    std::deque<DocumentSource::GetNextResult> _mockResults;
+};
+}  // namespace mongo