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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 "mongo/s/query/blocking_results_merger.h"
#include "mongo/s/query/results_merger_test_fixture.h"
namespace mongo {
namespace {
using BlockingResultsMergerTest = ResultsMergerTestFixture;
TEST_F(ResultsMergerTestFixture, ShouldBeAbleToBlockUntilKilled) {
std::vector<RemoteCursor> cursors;
cursors.emplace_back(
makeRemoteCursor(kTestShardIds[0], kTestShardHosts[0], CursorResponse(kTestNss, 1, {})));
BlockingResultsMerger blockingMerger(
operationContext(), makeARMParamsFromExistingCursors(std::move(cursors)), executor());
blockingMerger.kill(operationContext());
}
TEST_F(ResultsMergerTestFixture, ShouldBeAbleToBlockUntilNextResultIsReady) {
std::vector<RemoteCursor> cursors;
cursors.emplace_back(
makeRemoteCursor(kTestShardIds[0], kTestShardHosts[0], CursorResponse(kTestNss, 1, {})));
BlockingResultsMerger blockingMerger(
operationContext(), makeARMParamsFromExistingCursors(std::move(cursors)), executor());
// Issue a blocking wait for the next result asynchronously on a different thread.
auto future = launchAsync([&]() {
auto next = unittest::assertGet(
blockingMerger.next(operationContext(), RouterExecStage::ExecContext::kInitialFind));
ASSERT_FALSE(next.isEOF());
ASSERT_BSONOBJ_EQ(*next.getResult(), BSON("x" << 1));
next = unittest::assertGet(
blockingMerger.next(operationContext(), RouterExecStage::ExecContext::kInitialFind));
ASSERT_TRUE(next.isEOF());
});
// Schedule the response to the getMore which will return the next result and mark the cursor as
// exhausted.
onCommand([&](const auto& request) {
ASSERT(request.cmdObj["getMore"]);
return CursorResponse(kTestNss, 0LL, {BSON("x" << 1)})
.toBSON(CursorResponse::ResponseType::SubsequentResponse);
});
future.timed_get(kFutureTimeout);
}
TEST_F(ResultsMergerTestFixture, ShouldBeInterruptableDuringBlockingNext) {
std::vector<RemoteCursor> cursors;
cursors.emplace_back(
makeRemoteCursor(kTestShardIds[0], kTestShardHosts[0], CursorResponse(kTestNss, 1, {})));
auto params = makeARMParamsFromExistingCursors(std::move(cursors));
BlockingResultsMerger blockingMerger(operationContext(), std::move(params), executor());
// Issue a blocking wait for the next result asynchronously on a different thread.
auto future = launchAsync([&]() {
auto nextStatus = blockingMerger.next(operationContext(),
RouterExecStage::ExecContext::kGetMoreNoResultsYet);
ASSERT_EQ(nextStatus.getStatus(), ErrorCodes::Interrupted);
});
// Now mark the OperationContext as killed from this thread.
{
stdx::lock_guard<Client> lk(*operationContext()->getClient());
operationContext()->markKilled(ErrorCodes::Interrupted);
}
// Wait for the merger to be interrupted.
future.timed_get(kFutureTimeout);
// Now that we've seen it interrupted, kill it. We have to do this in another thread because
// killing a BlockingResultsMerger involves running a killCursors, and this main thread is in
// charge of scheduling the response to that request.
future = launchAsync([&]() { blockingMerger.kill(operationContext()); });
while (!networkHasReadyRequests() || !getNthPendingRequest(0u).cmdObj["killCursors"]) {
// Wait for the kill to schedule it's killCursors. It may schedule a getMore first before
// cancelling it, so wait until the pending request is actually a killCursors.
}
assertKillCusorsCmdHasCursorId(getNthPendingRequest(0u).cmdObj, 1);
// Run the callback for the killCursors. We don't actually inspect the value so we don't have to
// schedule a response.
runReadyCallbacks();
future.timed_get(kFutureTimeout);
}
} // namespace
} // namespace mongo
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