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/**
* Copyright (C) 2021-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/s/load_balancer_support.h"
#include "mongo/bson/json.h"
#include "mongo/db/service_context_test_fixture.h"
#include "mongo/logv2/log.h"
#include "mongo/s/concurrency/locker_mongos_client_observer.h"
#include "mongo/unittest/assert_that.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/fail_point.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kTest
namespace mongo {
namespace {
using namespace unittest::match;
class LoadBalancerSupportTest : public ServiceContextTest {
public:
LoadBalancerSupportTest() {
auto service = getServiceContext();
service->registerClientObserver(std::make_unique<LockerMongosClientObserver>());
}
using ServiceContextTest::ServiceContextTest;
BSONObj doHello(bool lbOption) {
BSONObjBuilder bob;
load_balancer_support::handleHello(&*makeOperationContext(), &bob, lbOption);
return bob.obj();
}
struct HasServiceId : Matcher {
std::string describe() const {
return "HasServiceId";
}
MatchResult match(BSONObj obj) const {
bool ok = obj.hasElement("serviceId");
std::string msg;
if (!ok)
msg = tojson(obj);
return {ok, msg};
}
};
FailPointEnableBlock simulateLoadBalancerConnection() const {
return FailPointEnableBlock("clientIsFromLoadBalancer");
}
};
TEST_F(LoadBalancerSupportTest, HelloNormalClientNoOption) {
ASSERT_THAT(doHello(false), Not(HasServiceId()));
}
TEST_F(LoadBalancerSupportTest, HelloNormalClientGivesOption) {
ASSERT_THAT(doHello(true), Not(HasServiceId()));
}
TEST_F(LoadBalancerSupportTest, HelloLoadBalancedClientNoOption) {
auto simLB = simulateLoadBalancerConnection();
try {
doHello(false);
FAIL("Expected to throw");
} catch (const DBException& ex) {
ASSERT_THAT(ex.toStatus(),
StatusIs(Eq(ErrorCodes::LoadBalancerSupportMismatch),
ContainsRegex("load balancer.*but.*driver")));
}
}
TEST_F(LoadBalancerSupportTest, HelloLoadBalancedClientGivesOption) {
auto simLB = simulateLoadBalancerConnection();
ASSERT_THAT(doHello(true), HasServiceId());
ASSERT_THAT(doHello(true), Not(HasServiceId())) << "only first hello is special";
}
} // namespace
} // namespace mongo
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