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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/replica_set_monitor_manager.h"
#include "mongo/client/streamable_replica_set_monitor.h"
#include "mongo/db/wire_version.h"
#include "mongo/executor/network_interface_factory.h"
#include "mongo/executor/network_interface_thread_pool.h"
#include "mongo/executor/thread_pool_task_executor.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/unittest/integration_test.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace executor {
namespace {
/**
* A mock class mimicking TaskExecutor::CallbackState, does nothing.
*/
class MockCallbackState final : public TaskExecutor::CallbackState {
public:
MockCallbackState() = default;
void cancel() override {}
void waitForCompletion() override {}
bool isCanceled() const override {
return false;
}
};
inline TaskExecutor::CallbackHandle makeCallbackHandle() {
return TaskExecutor::CallbackHandle(std::make_shared<MockCallbackState>());
}
class ReplicaSetMonitorFixture : public mongo::unittest::Test {
public:
constexpr static Milliseconds kTimeout{5000};
void resetIsInternalClient(bool isInternalClient) {
WireSpec::Specification newSpec = *WireSpec::instance().get();
newSpec.isInternalClient = isInternalClient;
WireSpec::instance().reset(std::move(newSpec));
}
void setUp() override {
resetIsInternalClient(true);
net = makeNetworkInterface("ReplicaSetMonintorTest");
auto tp = std::make_unique<NetworkInterfaceThreadPool>(net.get());
executor = std::make_shared<ThreadPoolTaskExecutor>(std::move(tp), net);
executor->startup();
connectionManager = std::make_unique<ReplicaSetMonitorConnectionManager>(net);
replSetUri = uassertStatusOK(MongoURI::parse(getReplSetConnectionString()));
numNodes = replSetUri.getServers().size();
};
void tearDown() override {
shutdownExecutor();
resetIsInternalClient(false);
};
void shutdownExecutor() {
if (executor) {
executor->shutdown();
executor.reset();
}
}
/**
* Runs the given remote command request, and returns the response.
*/
RemoteCommandResponse runCommand(RemoteCommandRequest request) {
RemoteCommandRequestOnAny rcroa{request};
auto deferred = net->startCommand(makeCallbackHandle(), rcroa)
.then([](TaskExecutor::ResponseOnAnyStatus roa) {
return RemoteCommandResponse(roa);
});
return deferred.get();
}
ConnectionString getFixtureConnectionString() {
return unittest::getFixtureConnectionString();
}
/**
* If this test is running on a mongos, returns the connection string for one of its replica
* set shards. Otherwise, assumes that the test is running on a replica set, and returns the
* fixture connection string.
*/
std::string getReplSetConnectionString() {
// Run the listShards command to get shards. Expect it to fail with CommandNotFound if
// this test is not running on mongos.
const auto cmdObj = BSON("listShards" << 1);
RemoteCommandRequest request{getFixtureConnectionString().getServers().front(),
"admin",
cmdObj,
BSONObj(),
nullptr,
kTimeout};
auto res = runCommand(request);
ASSERT_OK(res.status);
auto cmdStatus = getStatusFromCommandResult(res.data);
if (cmdStatus == ErrorCodes::CommandNotFound) {
// This test is not running on a mongos.
return getFixtureConnectionString().toString();
}
ASSERT_OK(cmdStatus);
const auto shards = res.data["shards"].Array();
ASSERT_FALSE(shards.empty());
return shards.front().embeddedObject().getStringField("host").toString();
}
protected:
std::shared_ptr<NetworkInterface> net;
std::shared_ptr<ThreadPoolTaskExecutor> executor;
std::shared_ptr<ReplicaSetMonitorConnectionManager> connectionManager;
ReplicaSetChangeNotifier notifier;
MongoURI replSetUri;
size_t numNodes;
};
TEST_F(ReplicaSetMonitorFixture, StreamableRSMWireVersion) {
auto rsm = ReplicaSetMonitorManager::get()->getOrCreateMonitor(replSetUri, nullptr);
// Schedule isMaster requests and wait for the responses.
auto primaryFuture =
rsm->getHostOrRefresh(ReadPreferenceSetting(mongo::ReadPreference::PrimaryOnly),
CancellationToken::uncancelable());
primaryFuture.get();
ASSERT_EQ(rsm->getMinWireVersion(), WireVersion::LATEST_WIRE_VERSION);
ASSERT_EQ(rsm->getMaxWireVersion(), WireVersion::LATEST_WIRE_VERSION);
}
TEST_F(ReplicaSetMonitorFixture, ReplicaSetMonitorCleanup) {
const auto& setName = replSetUri.getSetName();
ReplicaSetMonitor::cleanup();
auto sets = ReplicaSetMonitorManager::get()->getAllSetNames();
ASSERT_TRUE(std::find(sets.begin(), sets.end(), setName) == sets.end());
auto mutex = MONGO_MAKE_LATCH("ReplicaSetMonitorCleanup");
stdx::condition_variable cv;
bool cleanupInvoked = false;
auto rsm = ReplicaSetMonitorManager::get()->getOrCreateMonitor(replSetUri,
[&cleanupInvoked, &mutex, &cv] {
stdx::unique_lock lk(mutex);
cleanupInvoked = true;
cv.notify_one();
});
sets = ReplicaSetMonitorManager::get()->getAllSetNames();
ASSERT_TRUE(std::find(sets.begin(), sets.end(), setName) != sets.end());
shutdownExecutor();
rsm.reset();
stdx::unique_lock lk(mutex);
cv.wait(lk, [&cleanupInvoked] { return cleanupInvoked; });
ASSERT_TRUE(cleanupInvoked);
}
// Tests that RSM Manager registerForGarbageCollection() could be invoked while holding a
// lvl 2 mutex. Tests that GC is invoked before creating a new monitor.
TEST_F(ReplicaSetMonitorFixture, LockOrderingAndGC) {
ReplicaSetMonitor::cleanup();
ASSERT_EQ(0, ReplicaSetMonitorManager::get()->getAllSetNames().size());
auto monitor = ReplicaSetMonitor::createIfNeeded(replSetUri);
ASSERT_EQ(1, ReplicaSetMonitorManager::get()->getAllSetNames().size());
const auto previousGCCount =
ReplicaSetMonitorManager::get()->getGarbageCollectedMonitorsCount();
{
auto lvl2mutex = MONGO_MAKE_LATCH(HierarchicalAcquisitionLevel(2), "lvl2mutex");
stdx::unique_lock lk(lvl2mutex);
// This invokes delayed GC that locks only lvl 1 mutex.
monitor.reset();
// Tests that GC was not run yet.
ASSERT_EQ(previousGCCount,
ReplicaSetMonitorManager::get()->getGarbageCollectedMonitorsCount());
}
// Tests that GC was not invoked yet and the empty pointer is still in the cache.
ASSERT_EQ(1, ReplicaSetMonitorManager::get()->getNumMonitors());
// getAllSetNames() checks that each pointer is valid, thus it returns 0.
ASSERT_EQ(0, ReplicaSetMonitorManager::get()->getAllSetNames().size());
ReplicaSetMonitor::createIfNeeded(replSetUri);
// Tests that GC was run.
ASSERT_EQ(previousGCCount + 1,
ReplicaSetMonitorManager::get()->getGarbageCollectedMonitorsCount());
ASSERT_EQ(0, ReplicaSetMonitorManager::get()->getAllSetNames().size());
}
} // namespace
} // namespace executor
} // namespace mongo
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