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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 <memory>
#include "mongo/db/service_context_test_fixture.h"
#include "mongo/db/session_catalog.h"
#include "mongo/stdx/future.h"
#include "mongo/unittest/barrier.h"
#include "mongo/unittest/death_test.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
namespace {
class SessionCatalogTest : public ServiceContextTest {
protected:
SessionCatalog* catalog() {
return SessionCatalog::get(getServiceContext());
}
};
class SessionCatalogTestWithDefaultOpCtx : public SessionCatalogTest {
protected:
const ServiceContext::UniqueOperationContext _uniqueOpCtx = makeOperationContext();
OperationContext* const _opCtx = _uniqueOpCtx.get();
};
// When this class is in scope, makes the system behave as if we're in a DBDirectClient
class DirectClientSetter {
public:
explicit DirectClientSetter(OperationContext* opCtx)
: _opCtx(opCtx), _wasInDirectClient(_opCtx->getClient()->isInDirectClient()) {
_opCtx->getClient()->setInDirectClient(true);
}
~DirectClientSetter() {
_opCtx->getClient()->setInDirectClient(_wasInDirectClient);
}
private:
const OperationContext* _opCtx;
const bool _wasInDirectClient;
};
TEST_F(SessionCatalogTestWithDefaultOpCtx, CheckoutAndReleaseSession) {
_opCtx->setLogicalSessionId(makeLogicalSessionIdForTest());
OperationContextSession ocs(_opCtx);
auto session = OperationContextSession::get(_opCtx);
ASSERT(session);
ASSERT_EQ(*_opCtx->getLogicalSessionId(), session->getSessionId());
}
TEST_F(SessionCatalogTestWithDefaultOpCtx, OperationContextCheckedOutSession) {
_opCtx->setLogicalSessionId(makeLogicalSessionIdForTest());
const TxnNumber txnNum = 20;
_opCtx->setTxnNumber(txnNum);
OperationContextSession ocs(_opCtx);
auto session = OperationContextSession::get(_opCtx);
ASSERT(session);
ASSERT_EQ(*_opCtx->getLogicalSessionId(), session->getSessionId());
}
TEST_F(SessionCatalogTestWithDefaultOpCtx, NestedOperationContextSession) {
_opCtx->setLogicalSessionId(makeLogicalSessionIdForTest());
{
OperationContextSession outerScopedSession(_opCtx);
{
DirectClientSetter inDirectClient(_opCtx);
OperationContextSession innerScopedSession(_opCtx);
auto session = OperationContextSession::get(_opCtx);
ASSERT(session);
ASSERT_EQ(*_opCtx->getLogicalSessionId(), session->getSessionId());
}
{
DirectClientSetter inDirectClient(_opCtx);
auto session = OperationContextSession::get(_opCtx);
ASSERT(session);
ASSERT_EQ(*_opCtx->getLogicalSessionId(), session->getSessionId());
}
}
ASSERT(!OperationContextSession::get(_opCtx));
}
TEST_F(SessionCatalogTest, ScanSession) {
// Create three sessions in the catalog.
const std::vector<LogicalSessionId> lsids{makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest()};
for (const auto& lsid : lsids) {
stdx::async(stdx::launch::async,
[this, lsid] {
ThreadClient tc(getServiceContext());
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(opCtx.get());
})
.get();
}
catalog()->scanSession(lsids[0], [&lsids](const ObservableSession& session) {
ASSERT_EQ(lsids[0], session.get()->getSessionId());
});
catalog()->scanSession(lsids[1], [&lsids](const ObservableSession& session) {
ASSERT_EQ(lsids[1], session.get()->getSessionId());
});
catalog()->scanSession(lsids[2], [&lsids](const ObservableSession& session) {
ASSERT_EQ(lsids[2], session.get()->getSessionId());
});
catalog()->scanSession(makeLogicalSessionIdForTest(), [](const ObservableSession&) {
FAIL("The callback was called for non-existent session");
});
}
TEST_F(SessionCatalogTest, ScanSessionMarkForReapWhenSessionIsIdle) {
// Create three sessions in the catalog.
const std::vector<LogicalSessionId> lsids{makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest()};
for (const auto& lsid : lsids) {
stdx::async(stdx::launch::async,
[this, lsid] {
ThreadClient tc(getServiceContext());
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(opCtx.get());
})
.get();
}
catalog()->scanSession(lsids[0],
[&lsids](ObservableSession& session) { session.markForReap(); });
catalog()->scanSession(lsids[0], [](const ObservableSession&) {
FAIL("The callback was called for non-existent session");
});
catalog()->scanSession(lsids[1], [&lsids](const ObservableSession& session) {
ASSERT_EQ(lsids[1], session.get()->getSessionId());
});
catalog()->scanSession(lsids[2], [&lsids](const ObservableSession& session) {
ASSERT_EQ(lsids[2], session.get()->getSessionId());
});
}
TEST_F(SessionCatalogTestWithDefaultOpCtx, ScanSessions) {
std::vector<LogicalSessionId> lsidsFound;
const auto workerFn = [&lsidsFound](const ObservableSession& session) {
lsidsFound.push_back(session.getSessionId());
};
// Scan over zero Sessions.
SessionKiller::Matcher matcherAllSessions(
KillAllSessionsByPatternSet{makeKillAllSessionsByPattern(_opCtx)});
catalog()->scanSessions(matcherAllSessions, workerFn);
ASSERT(lsidsFound.empty());
lsidsFound.clear();
// Create three sessions in the catalog.
const std::vector<LogicalSessionId> lsids{makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest()};
for (const auto& lsid : lsids) {
stdx::async(stdx::launch::async,
[this, lsid] {
ThreadClient tc(getServiceContext());
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(opCtx.get());
})
.get();
}
// Scan over all Sessions.
catalog()->scanSessions(matcherAllSessions, workerFn);
ASSERT_EQ(3U, lsidsFound.size());
lsidsFound.clear();
// Scan over all Sessions, visiting a particular Session.
SessionKiller::Matcher matcherLSID2(
KillAllSessionsByPatternSet{makeKillAllSessionsByPattern(_opCtx, lsids[2])});
catalog()->scanSessions(matcherLSID2, workerFn);
ASSERT_EQ(1U, lsidsFound.size());
ASSERT_EQ(lsids[2], lsidsFound.front());
lsidsFound.clear();
}
TEST_F(SessionCatalogTestWithDefaultOpCtx, ScanSessionsMarkForReap) {
// Create three sessions in the catalog.
const std::vector<LogicalSessionId> lsids{makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest()};
unittest::Barrier sessionsCheckedOut(2);
unittest::Barrier sessionsCheckedIn(2);
auto f = stdx::async(stdx::launch::async, [&] {
ThreadClient tc(getServiceContext());
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsids[1]);
OperationContextSession ocs(opCtx.get());
sessionsCheckedOut.countDownAndWait();
sessionsCheckedIn.countDownAndWait();
});
// After this wait, session 1 is checked-out and waiting on the barrier, because of which only
// sessions 0 and 2 will be reaped
sessionsCheckedOut.countDownAndWait();
SessionKiller::Matcher matcherAllSessions(
KillAllSessionsByPatternSet{makeKillAllSessionsByPattern(_opCtx)});
catalog()->scanSessions(matcherAllSessions,
[&](ObservableSession& session) { session.markForReap(); });
catalog()->scanSessions(matcherAllSessions, [&](const ObservableSession& session) {
ASSERT_EQ(lsids[1], session.get()->getSessionId());
});
// After this point, session 1 is checked back in
sessionsCheckedIn.countDownAndWait();
f.get();
catalog()->scanSessions(matcherAllSessions, [&](const ObservableSession& session) {
ASSERT_EQ(lsids[1], session.get()->getSessionId());
});
}
TEST_F(SessionCatalogTest, KillSessionWhenSessionIsNotCheckedOut) {
const auto lsid = makeLogicalSessionIdForTest();
// Create the session so there is something to kill
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(opCtx.get());
}
auto killToken = catalog()->killSession(lsid);
// Make sure that regular session check-out will fail because the session is marked as killed
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
opCtx->setDeadlineAfterNowBy(Milliseconds(10), ErrorCodes::MaxTimeMSExpired);
ASSERT_THROWS_CODE(
OperationContextSession(opCtx.get()), AssertionException, ErrorCodes::MaxTimeMSExpired);
}
// Schedule a separate "regular operation" thread, which will block on checking-out the session,
// which we will use to confirm that session kill completion actually unblocks check-out
auto future = stdx::async(stdx::launch::async, [this, lsid] {
ThreadClient tc(getServiceContext());
auto sideOpCtx = Client::getCurrent()->makeOperationContext();
sideOpCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(sideOpCtx.get());
});
ASSERT(stdx::future_status::ready != future.wait_for(Milliseconds(10).toSystemDuration()));
// Make sure that "for kill" session check-out succeeds
{
auto opCtx = makeOperationContext();
auto scopedSession = catalog()->checkOutSessionForKill(opCtx.get(), std::move(killToken));
ASSERT_EQ(opCtx.get(), scopedSession.currentOperation_forTest());
}
// Make sure that session check-out after kill succeeds again
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(opCtx.get());
}
// Make sure the "regular operation" eventually is able to proceed and use the just killed
// session
future.get();
}
TEST_F(SessionCatalogTest, KillSessionWhenSessionIsCheckedOut) {
const auto lsid = makeLogicalSessionIdForTest();
auto killToken = [this, &lsid] {
// Create the session so there is something to kill
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession operationContextSession(opCtx.get());
auto killToken = catalog()->killSession(lsid);
// Make sure the owning operation context is interrupted
ASSERT_THROWS_CODE(opCtx->checkForInterrupt(), AssertionException, ErrorCodes::Interrupted);
// Make sure that the checkOutForKill call will wait for the owning operation context to
// check the session back in
auto future = stdx::async(stdx::launch::async, [this, lsid] {
ThreadClient tc(getServiceContext());
auto sideOpCtx = Client::getCurrent()->makeOperationContext();
sideOpCtx->setLogicalSessionId(lsid);
sideOpCtx->setDeadlineAfterNowBy(Milliseconds(10), ErrorCodes::MaxTimeMSExpired);
OperationContextSession ocs(sideOpCtx.get());
});
ASSERT_THROWS_CODE(future.get(), AssertionException, ErrorCodes::MaxTimeMSExpired);
return killToken;
}();
// Make sure that regular session check-out will fail because the session is marked as killed
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
opCtx->setDeadlineAfterNowBy(Milliseconds(10), ErrorCodes::MaxTimeMSExpired);
ASSERT_THROWS_CODE(
OperationContextSession(opCtx.get()), AssertionException, ErrorCodes::MaxTimeMSExpired);
}
// Schedule a separate "regular operation" thread, which will block on checking-out the session,
// which we will use to confirm that session kill completion actually unblocks check-out
auto future = stdx::async(stdx::launch::async, [this, lsid] {
ThreadClient tc(getServiceContext());
auto sideOpCtx = Client::getCurrent()->makeOperationContext();
sideOpCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(sideOpCtx.get());
});
ASSERT(stdx::future_status::ready != future.wait_for(Milliseconds(10).toSystemDuration()));
// Make sure that "for kill" session check-out succeeds
{
auto opCtx = makeOperationContext();
auto scopedSession = catalog()->checkOutSessionForKill(opCtx.get(), std::move(killToken));
ASSERT_EQ(opCtx.get(), scopedSession.currentOperation_forTest());
}
// Make sure that session check-out after kill succeeds again
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(opCtx.get());
}
// Make sure the "regular operation" eventually is able to proceed and use the just killed
// session
future.get();
}
TEST_F(SessionCatalogTest, MarkSessionAsKilledCanBeCalledMoreThanOnce) {
const auto lsid = makeLogicalSessionIdForTest();
// Create the session so there is something to kill
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(opCtx.get());
}
auto killToken1 = catalog()->killSession(lsid);
auto killToken2 = catalog()->killSession(lsid);
// Make sure that regular session check-out will fail because there are two killers on the
// session
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
opCtx->setDeadlineAfterNowBy(Milliseconds(10), ErrorCodes::MaxTimeMSExpired);
ASSERT_THROWS_CODE(
OperationContextSession(opCtx.get()), AssertionException, ErrorCodes::MaxTimeMSExpired);
}
boost::optional<SessionCatalog::KillToken> killTokenWhileSessionIsCheckedOutForKill;
// Finish the first killer of the session
{
auto opCtx = makeOperationContext();
auto scopedSession = catalog()->checkOutSessionForKill(opCtx.get(), std::move(killToken1));
ASSERT_EQ(opCtx.get(), scopedSession.currentOperation_forTest());
// Killing a session while checked out for kill should not affect the killers
killTokenWhileSessionIsCheckedOutForKill.emplace(catalog()->killSession(lsid));
}
// Regular session check-out should still fail because there are now still two killers on the
// session
{
auto opCtx = makeOperationContext();
opCtx->setLogicalSessionId(lsid);
opCtx->setDeadlineAfterNowBy(Milliseconds(10), ErrorCodes::MaxTimeMSExpired);
ASSERT_THROWS_CODE(
OperationContextSession(opCtx.get()), AssertionException, ErrorCodes::MaxTimeMSExpired);
}
{
auto opCtx = makeOperationContext();
auto scopedSession = catalog()->checkOutSessionForKill(opCtx.get(), std::move(killToken2));
ASSERT_EQ(opCtx.get(), scopedSession.currentOperation_forTest());
}
{
auto opCtx = makeOperationContext();
auto scopedSession = catalog()->checkOutSessionForKill(
opCtx.get(), std::move(*killTokenWhileSessionIsCheckedOutForKill));
ASSERT_EQ(opCtx.get(), scopedSession.currentOperation_forTest());
}
}
TEST_F(SessionCatalogTest, MarkSessionsAsKilledWhenSessionDoesNotExist) {
const auto nonExistentLsid = makeLogicalSessionIdForTest();
ASSERT_THROWS_CODE(
catalog()->killSession(nonExistentLsid), AssertionException, ErrorCodes::NoSuchSession);
}
TEST_F(SessionCatalogTestWithDefaultOpCtx, SessionDiscarOperationContextAfterCheckIn) {
_opCtx->setLogicalSessionId(makeLogicalSessionIdForTest());
{
OperationContextSession ocs(_opCtx);
ASSERT(OperationContextSession::get(_opCtx));
OperationContextSession::checkIn(_opCtx);
ASSERT(!OperationContextSession::get(_opCtx));
}
ASSERT(!OperationContextSession::get(_opCtx));
}
TEST_F(SessionCatalogTestWithDefaultOpCtx, SessionDiscarOperationContextAfterCheckInCheckOut) {
_opCtx->setLogicalSessionId(makeLogicalSessionIdForTest());
{
OperationContextSession ocs(_opCtx);
ASSERT(OperationContextSession::get(_opCtx));
OperationContextSession::checkIn(_opCtx);
ASSERT(!OperationContextSession::get(_opCtx));
OperationContextSession::checkOut(_opCtx);
ASSERT(OperationContextSession::get(_opCtx));
}
ASSERT(!OperationContextSession::get(_opCtx));
}
TEST_F(SessionCatalogTestWithDefaultOpCtx, KillSessionsThroughScanSessions) {
// Create three sessions
const std::vector<LogicalSessionId> lsids{makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest(),
makeLogicalSessionIdForTest()};
std::vector<stdx::future<void>> futures;
unittest::Barrier firstUseOfTheSessionReachedBarrier(lsids.size() + 1);
for (const auto& lsid : lsids) {
futures.emplace_back(
stdx::async(stdx::launch::async, [this, lsid, &firstUseOfTheSessionReachedBarrier] {
ThreadClient tc(getServiceContext());
{
auto sideOpCtx = Client::getCurrent()->makeOperationContext();
sideOpCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(sideOpCtx.get());
firstUseOfTheSessionReachedBarrier.countDownAndWait();
ASSERT_THROWS_CODE(sideOpCtx->sleepFor(Hours{6}),
AssertionException,
ErrorCodes::ExceededTimeLimit);
}
{
auto sideOpCtx = Client::getCurrent()->makeOperationContext();
sideOpCtx->setLogicalSessionId(lsid);
OperationContextSession ocs(sideOpCtx.get());
}
}));
}
// Make sure all spawned threads have created the session
firstUseOfTheSessionReachedBarrier.countDownAndWait();
// Kill the first and the third sessions
{
std::vector<SessionCatalog::KillToken> firstAndThirdTokens;
catalog()->scanSessions(
SessionKiller::Matcher(
KillAllSessionsByPatternSet{makeKillAllSessionsByPattern(_opCtx)}),
[&lsids, &firstAndThirdTokens](const ObservableSession& session) {
if (session.getSessionId() == lsids[0] || session.getSessionId() == lsids[2])
firstAndThirdTokens.emplace_back(session.kill(ErrorCodes::ExceededTimeLimit));
});
ASSERT_EQ(2U, firstAndThirdTokens.size());
for (auto& killToken : firstAndThirdTokens) {
auto unusedSheckedOutSessionForKill(
catalog()->checkOutSessionForKill(_opCtx, std::move(killToken)));
}
futures[0].get();
futures[2].get();
}
// Kill the second session
{
std::vector<SessionCatalog::KillToken> secondToken;
catalog()->scanSessions(
SessionKiller::Matcher(
KillAllSessionsByPatternSet{makeKillAllSessionsByPattern(_opCtx)}),
[&lsids, &secondToken](const ObservableSession& session) {
if (session.getSessionId() == lsids[1])
secondToken.emplace_back(session.kill(ErrorCodes::ExceededTimeLimit));
});
ASSERT_EQ(1U, secondToken.size());
for (auto& killToken : secondToken) {
auto unusedSheckedOutSessionForKill(
catalog()->checkOutSessionForKill(_opCtx, std::move(killToken)));
}
futures[1].get();
}
}
// Test that session kill will block normal sesion chechout and will be signaled correctly.
// Even if the implementaion has a bug, the test may not always fail depending on thread
// scheduling, however, this test case still gives us a good coverage.
TEST_F(SessionCatalogTestWithDefaultOpCtx, ConcurrentCheckOutAndKill) {
auto lsid = makeLogicalSessionIdForTest();
_opCtx->setLogicalSessionId(lsid);
stdx::future<void> normalCheckOutFinish, killCheckOutFinish;
// This variable is protected by the session check-out.
std::string lastSessionCheckOut = "first session";
{
// Check out the session to block both normal check-out and checkOutForKill.
OperationContextSession firstCheckOut(_opCtx);
// Normal check out should start after kill.
normalCheckOutFinish = stdx::async(stdx::launch::async, [&] {
ThreadClient tc(getGlobalServiceContext());
auto sideOpCtx = Client::getCurrent()->makeOperationContext();
sideOpCtx->setLogicalSessionId(lsid);
OperationContextSession normalCheckOut(sideOpCtx.get());
ASSERT_EQ("session kill", lastSessionCheckOut);
lastSessionCheckOut = "session checkout";
});
// Kill will short-cut the queue and be the next one to check out.
killCheckOutFinish = stdx::async(stdx::launch::async, [&] {
ThreadClient tc(getGlobalServiceContext());
auto sideOpCtx = Client::getCurrent()->makeOperationContext();
sideOpCtx->setLogicalSessionId(lsid);
// Kill the session
std::vector<SessionCatalog::KillToken> killTokens;
catalog()->scanSessions(
SessionKiller::Matcher(
KillAllSessionsByPatternSet{makeKillAllSessionsByPattern(sideOpCtx.get())}),
[&killTokens](const ObservableSession& session) {
killTokens.emplace_back(session.kill(ErrorCodes::InternalError));
});
ASSERT_EQ(1U, killTokens.size());
auto checkOutSessionForKill(
catalog()->checkOutSessionForKill(sideOpCtx.get(), std::move(killTokens[0])));
ASSERT_EQ("first session", lastSessionCheckOut);
lastSessionCheckOut = "session kill";
});
// The main thread won't check in the session until it's killed.
{
auto m = MONGO_MAKE_LATCH();
stdx::condition_variable cond;
stdx::unique_lock<Latch> lock(m);
ASSERT_THROWS_CODE(
_opCtx->waitForConditionOrInterrupt(cond, lock, [] { return false; }),
DBException,
ErrorCodes::InternalError);
}
}
normalCheckOutFinish.get();
killCheckOutFinish.get();
ASSERT_EQ("session checkout", lastSessionCheckOut);
}
} // namespace
} // namespace mongo
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