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/**
* Copyright (C) 2017 MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/timestamp.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/logical_clock_test_fixture.h"
#include "mongo/db/logical_time.h"
#include "mongo/db/repl/replication_coordinator_mock.h"
#include "mongo/stdx/memory.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/clock_source_mock.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
std::string kDummyNamespaceString = "test.foo";
using LogicalClockTest = LogicalClockTestFixture;
// Check that the initial time does not change during logicalClock creation.
TEST_F(LogicalClockTest, roundtrip) {
Timestamp tX(1);
auto time = LogicalTime(tX);
getClock()->setClusterTimeFromTrustedSource(time);
auto storedTime(getClock()->getClusterTime());
ASSERT_TRUE(storedTime == time);
}
// Verify the reserve ticks functionality.
TEST_F(LogicalClockTest, reserveTicks) {
// Set clock to a non-zero time, so we can verify wall clock synchronization.
setMockClockSourceTime(Date_t::fromMillisSinceEpoch(10 * 1000));
auto t1 = getClock()->reserveTicks(1);
auto t2(getClock()->getClusterTime());
ASSERT_TRUE(t1 == t2);
// Make sure we synchronized with the wall clock.
ASSERT_TRUE(t2.asTimestamp().getSecs() == 10);
auto t3 = getClock()->reserveTicks(1);
t1.addTicks(1);
ASSERT_TRUE(t3 == t1);
t3 = getClock()->reserveTicks(100);
t1.addTicks(1);
ASSERT_TRUE(t3 == t1);
t3 = getClock()->reserveTicks(1);
t1.addTicks(100);
ASSERT_TRUE(t3 == t1);
// Ensure overflow to a new second.
auto initTimeSecs = getClock()->getClusterTime().asTimestamp().getSecs();
getClock()->reserveTicks((1U << 31) - 1);
auto newTimeSecs = getClock()->getClusterTime().asTimestamp().getSecs();
ASSERT_TRUE(newTimeSecs == initTimeSecs + 1);
}
// Verify the advanceClusterTime functionality.
TEST_F(LogicalClockTest, advanceClusterTime) {
auto t1 = getClock()->reserveTicks(1);
t1.addTicks(100);
ASSERT_OK(getClock()->advanceClusterTime(t1));
ASSERT_TRUE(t1 == getClock()->getClusterTime());
}
// Verify rate limiter rejects logical times whose seconds values are too far ahead.
TEST_F(LogicalClockTest, RateLimiterRejectsLogicalTimesTooFarAhead) {
setMockClockSourceTime(Date_t::fromMillisSinceEpoch(10 * 1000));
Timestamp tooFarAheadTimestamp(
durationCount<Seconds>(getMockClockSourceTime().toDurationSinceEpoch()) +
durationCount<Seconds>(LogicalClock::kMaxAcceptableLogicalClockDrift) +
10, // Add 10 seconds to ensure limit is exceeded.
1);
LogicalTime t1(tooFarAheadTimestamp);
ASSERT_EQ(ErrorCodes::ClusterTimeFailsRateLimiter, getClock()->advanceClusterTime(t1));
}
// Verify cluster time can be initialized to a very old time.
TEST_F(LogicalClockTest, InitFromTrustedSourceCanAcceptVeryOldLogicalTime) {
setMockClockSourceTime(Date_t::fromMillisSinceEpoch(
durationCount<Seconds>(LogicalClock::kMaxAcceptableLogicalClockDrift) * 10 * 1000));
Timestamp veryOldTimestamp(
durationCount<Seconds>(getMockClockSourceTime().toDurationSinceEpoch()) -
(durationCount<Seconds>(LogicalClock::kMaxAcceptableLogicalClockDrift) * 5));
auto veryOldTime = LogicalTime(veryOldTimestamp);
getClock()->setClusterTimeFromTrustedSource(veryOldTime);
ASSERT_TRUE(getClock()->getClusterTime() == veryOldTime);
}
// Verify writes to the oplog advance cluster time.
TEST_F(LogicalClockTest, WritesToOplogAdvanceClusterTime) {
Timestamp tX(1);
auto initialTime = LogicalTime(tX);
getClock()->setClusterTimeFromTrustedSource(initialTime);
ASSERT_TRUE(getClock()->getClusterTime() == initialTime);
getDBClient()->insert(kDummyNamespaceString, BSON("x" << 1));
ASSERT_TRUE(getClock()->getClusterTime() > initialTime);
ASSERT_EQ(getClock()->getClusterTime().asTimestamp(),
replicationCoordinator()->getMyLastAppliedOpTime().getTimestamp());
}
} // unnamed namespace
} // namespace mongo
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