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/**
* Copyright (C) 2020-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/client/read_preference.h"
#include "mongo/s/hedge_options_util.h"
#include "mongo/s/mongos_server_parameters_gen.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/duration.h"
namespace mongo {
namespace {
class HedgeOptionsUtilTestFixture : public unittest::Test {
protected:
void setUp() {
// Reset all the hedging server parameters.
setParameters(kDefaultParameters);
}
/**
* Set the given server parameters.
*/
void setParameters(const BSONObj& parameters) {
const ServerParameter::Map& parameterMap = ServerParameterSet::getGlobal()->getMap();
BSONObjIterator parameterIterator(parameters);
while (parameterIterator.more()) {
BSONElement parameter = parameterIterator.next();
std::string parameterName = parameter.fieldName();
ServerParameter::Map::const_iterator foundParameter = parameterMap.find(parameterName);
uassertStatusOK(foundParameter->second->set(parameter));
}
}
/**
* Sets the given server parameters and creates ReadPreferenceSetting from 'rspObj' and extracts
* HedgeOptions from it. If 'hedge' is true, asserts that the resulting HedgeOptions is not
* empty, otherwise asserts that it is empty. Resets the server parameters to the defaults
* before returning.
*/
void checkHedgeOptions(const BSONObj& serverParameters,
const BSONObj& cmdObj,
const BSONObj& rspObj,
const bool hedge,
const int maxTimeMSForHedgedReads = kMaxTimeMSForHedgedReadsDefault) {
setParameters(serverParameters);
auto readPref = uassertStatusOK(ReadPreferenceSetting::fromInnerBSON(rspObj));
auto hedgeOptions = extractHedgeOptions(cmdObj, readPref);
if (hedge) {
ASSERT_TRUE(hedgeOptions.has_value());
ASSERT_EQ(hedgeOptions->maxTimeMSForHedgedReads, maxTimeMSForHedgedReads);
} else {
ASSERT_FALSE(hedgeOptions.has_value());
}
}
static inline const std::string kCollName = "testColl";
static inline const StringData mapJavascript = "map!"_sd;
static inline const StringData reduceJavascript = "reduce!"_sd;
static inline const std::string kReadHedgingModeFieldName = "readHedgingMode";
static inline const std::string kMaxTimeMSForHedgedReadsFieldName = "maxTimeMSForHedgedReads";
static inline const int kMaxTimeMSForHedgedReadsDefault = 10;
static inline const BSONObj kDefaultParameters =
BSON(kReadHedgingModeFieldName << "on" << kMaxTimeMSForHedgedReadsFieldName
<< kMaxTimeMSForHedgedReadsDefault);
private:
ServiceContext::UniqueServiceContext _serviceCtx = ServiceContext::make();
ServiceContext::UniqueClient _client = _serviceCtx->makeClient("RemoteCommandRequestTest");
};
TEST_F(HedgeOptionsUtilTestFixture, ExplicitOperationHedging) {
const auto parameters = BSONObj();
const auto cmdObj = BSON("find" << kCollName);
const auto rspObj = BSON("mode"
<< "primaryPreferred"
<< "hedge" << BSONObj());
checkHedgeOptions(parameters, cmdObj, rspObj, true);
}
TEST_F(HedgeOptionsUtilTestFixture, ImplicitOperationHedging) {
const auto parameters = BSONObj();
const auto cmdObj = BSON("find" << kCollName);
const auto rspObj = BSON("mode"
<< "nearest");
checkHedgeOptions(parameters, cmdObj, rspObj, true);
}
TEST_F(HedgeOptionsUtilTestFixture, BlacklistAggregate) {
const auto parameters = BSONObj();
const auto cmdObj =
BSON("aggregate" << kCollName << "pipeline" << BSONObj() << "cursor" << BSONObj());
const auto rspObj = BSON("mode"
<< "nearest"
<< "hedge" << BSONObj());
checkHedgeOptions(parameters, cmdObj, rspObj, false);
}
TEST_F(HedgeOptionsUtilTestFixture, BlacklistMapReduce) {
const auto parameters = BSONObj();
const auto rspObj = BSON("mode"
<< "nearest"
<< "hedge" << BSONObj());
{
const auto cmdObj = BSON("mapreduce"
<< "sourceColl"
<< "map" << mapJavascript << "reduce" << reduceJavascript << "out"
<< "targetColl"
<< "$db"
<< "db");
checkHedgeOptions(parameters, cmdObj, rspObj, false);
}
{
const auto cmdObj = BSON("mapReduce"
<< "sourceColl"
<< "map" << mapJavascript << "reduce" << reduceJavascript << "out"
<< "targetColl"
<< "$db"
<< "db");
checkHedgeOptions(parameters, cmdObj, rspObj, false);
}
}
TEST_F(HedgeOptionsUtilTestFixture, OperationHedgingDisabled) {
const auto parameters = BSONObj();
const auto cmdObj = BSON("find" << kCollName);
const auto rspObj = BSON("mode"
<< "nearest"
<< "hedge" << BSON("enabled" << false));
checkHedgeOptions(parameters, cmdObj, rspObj, false);
}
TEST_F(HedgeOptionsUtilTestFixture, ReadHedgingModeOff) {
const auto parameters = BSON(kReadHedgingModeFieldName << "off");
const auto cmdObj = BSON("find" << kCollName);
const auto rspObj = BSON("mode"
<< "nearest"
<< "hedge" << BSONObj());
checkHedgeOptions(parameters, cmdObj, rspObj, false);
}
TEST_F(HedgeOptionsUtilTestFixture, MaxTimeMSForHedgedReads) {
const auto parameters =
BSON(kReadHedgingModeFieldName << "on" << kMaxTimeMSForHedgedReadsFieldName << 100);
const auto cmdObj = BSON("find" << kCollName);
const auto rspObj = BSON("mode"
<< "nearest"
<< "hedge" << BSONObj());
checkHedgeOptions(parameters, cmdObj, rspObj, true, 100);
}
} // namespace
} // namespace mongo
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