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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/s/migration_destination_manager.h"
#include "mongo/s/shard_server_test_fixture.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
using unittest::assertGet;
class MigrationDestinationManagerTest : public ShardServerTestFixture {
protected:
/**
* Instantiates a BSON object in which both "_id" and "X" are set to value.
*/
static BSONObj createDocument(int value) {
return BSON("_id" << value << "X" << value);
}
/**
* Creates a list of documents to clone.
*/
static std::vector<BSONObj> createDocumentsToClone() {
return {createDocument(1), createDocument(2), createDocument(3)};
}
/**
* Creates a list of documents to clone and converts it to a BSONArray.
*/
static BSONArray createDocumentsToCloneArray() {
BSONArrayBuilder arrayBuilder;
for (auto& doc : createDocumentsToClone()) {
arrayBuilder.append(doc);
}
return arrayBuilder.arr();
}
};
// Tests that documents will ferry from the fetch logic to the insert logic successfully.
TEST_F(MigrationDestinationManagerTest, CloneDocumentsFromDonorWorksCorrectly) {
bool ranOnce = false;
auto fetchBatchFn = [&](OperationContext* opCtx) {
BSONObjBuilder fetchBatchResultBuilder;
if (ranOnce) {
fetchBatchResultBuilder.append("objects", BSONObj());
} else {
ranOnce = true;
fetchBatchResultBuilder.append("objects", createDocumentsToCloneArray());
}
return fetchBatchResultBuilder.obj();
};
std::vector<BSONObj> resultDocs;
auto insertBatchFn = [&](OperationContext* opCtx, BSONObj docs) {
for (auto&& docToClone : docs) {
resultDocs.push_back(docToClone.Obj().getOwned());
}
};
MigrationDestinationManager::cloneDocumentsFromDonor(
operationContext(), insertBatchFn, fetchBatchFn);
std::vector<BSONObj> originalDocs = createDocumentsToClone();
ASSERT_EQ(originalDocs.size(), resultDocs.size());
for (auto originalDocsIt = originalDocs.begin(), resultDocsIt = resultDocs.begin();
originalDocsIt != originalDocs.end() && resultDocsIt != resultDocs.end();
++originalDocsIt, ++resultDocsIt) {
ASSERT_BSONOBJ_EQ(*originalDocsIt, *resultDocsIt);
}
}
// Tests that an exception in the fetch logic will successfully throw an exception on the main
// thread.
TEST_F(MigrationDestinationManagerTest, CloneDocumentsThrowsFetchErrors) {
bool ranOnce = false;
auto fetchBatchFn = [&](OperationContext* opCtx) {
BSONObjBuilder fetchBatchResultBuilder;
if (ranOnce) {
uasserted(ErrorCodes::NetworkTimeout, "network error");
}
ranOnce = true;
fetchBatchResultBuilder.append("objects", createDocumentsToCloneArray());
return fetchBatchResultBuilder.obj();
};
auto insertBatchFn = [&](OperationContext* opCtx, BSONObj docs) {};
ASSERT_THROWS_CODE_AND_WHAT(MigrationDestinationManager::cloneDocumentsFromDonor(
operationContext(), insertBatchFn, fetchBatchFn),
DBException,
ErrorCodes::NetworkTimeout,
"network error");
}
// Tests that an exception in the insertion logic will successfully throw an exception on the
// main thread.
TEST_F(MigrationDestinationManagerTest, CloneDocumentsCatchesInsertErrors) {
auto fetchBatchFn = [&](OperationContext* opCtx) {
BSONObjBuilder fetchBatchResultBuilder;
fetchBatchResultBuilder.append("objects", createDocumentsToCloneArray());
return fetchBatchResultBuilder.obj();
};
auto insertBatchFn = [&](OperationContext* opCtx, BSONObj docs) {
uasserted(ErrorCodes::FailedToParse, "insertion error");
};
// Since the error is thrown on another thread, the message becomes "operation was interrupted"
// on the main thread.
ASSERT_THROWS_CODE_AND_WHAT(MigrationDestinationManager::cloneDocumentsFromDonor(
operationContext(), insertBatchFn, fetchBatchFn),
DBException,
51008,
"operation was interrupted");
ASSERT_EQ(operationContext()->getKillStatus(), 51008);
}
} // namespace
} // namespace mongo
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