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/**
* Copyright (C) 2022-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/bson/simple_bsonobj_comparator.h"
#include "mongo/db/catalog/rename_collection.h"
#include "mongo/db/query/telemetry.h"
#include "mongo/db/service_context_test_fixture.h"
#include "mongo/unittest/unittest.h"
namespace mongo::telemetry {
class TelemetryStoreTest : public ServiceContextTest {};
TEST_F(TelemetryStoreTest, BasicUsage) {
TelemetryStore telStore{5000000, 1000};
auto getMetrics = [&](BSONObj& key) {
auto lookupResult = telStore.lookup(key);
return *lookupResult.getValue();
};
auto collectMetrics = [&](BSONObj& key) {
TelemetryMetrics* metrics;
auto lookupResult = telStore.lookup(key);
if (!lookupResult.isOK()) {
telStore.put(key, TelemetryMetrics{});
lookupResult = telStore.lookup(key);
}
metrics = lookupResult.getValue();
metrics->execCount += 1;
metrics->lastExecutionMicros += 123456;
};
auto query1 = BSON("query" << 1 << "xEquals" << 42);
// same value, different instance (tests hashing & equality)
auto query1x = BSON("query" << 1 << "xEquals" << 42);
auto query2 = BSON("query" << 2 << "yEquals" << 43);
collectMetrics(query1);
collectMetrics(query1);
collectMetrics(query1x);
collectMetrics(query2);
ASSERT_EQ(getMetrics(query1).execCount, 3);
ASSERT_EQ(getMetrics(query1x).execCount, 3);
ASSERT_EQ(getMetrics(query2).execCount, 1);
auto collectMetricsWithLock = [&](BSONObj& key) {
auto [lookupResult, lock] = telStore.getWithPartitionLock(key);
auto metrics = lookupResult.getValue();
metrics->execCount += 1;
metrics->lastExecutionMicros += 123456;
};
collectMetricsWithLock(query1x);
collectMetricsWithLock(query2);
ASSERT_EQ(getMetrics(query1).execCount, 4);
ASSERT_EQ(getMetrics(query1x).execCount, 4);
ASSERT_EQ(getMetrics(query2).execCount, 2);
int numKeys = 0;
telStore.forEach([&](const BSONObj& key, const TelemetryMetrics& entry) { numKeys++; });
ASSERT_EQ(numKeys, 2);
}
/**
* Spin up multiple threads reading/writing the store to empirically verify we don't hit an
* invariant.
*/
TEST_F(TelemetryStoreTest, ReadWriteLocking) {
std::vector<stdx::thread> threads;
auto svcCtx = getServiceContext();
for (int i = 0; i < 20; ++i) {
threads.emplace_back([&, i]() {
auto client = svcCtx->makeClient(std::to_string(i));
auto opCtx = client->makeOperationContext();
if (i % 4 > 0) {
auto sharedTelemetryStore = getTelemetryStoreForRead(opCtx.get());
BSONObj key;
auto status = sharedTelemetryStore->lookup(key);
// Key isn't found, we just need to do something while holding the store's read
// lock.
ASSERT_NOT_OK(status);
} else {
[[maybe_unused]] auto oldStore = resetTelemetryStore(opCtx.get());
}
});
}
for (auto&& thread : threads) {
thread.join();
}
}
} // namespace mongo::telemetry
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