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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/db/concurrency/locker_noop_client_observer.h"
#include "mongo/db/service_context_test_fixture.h"
#include "mongo/logv2/log.h"
#include "mongo/unittest/log_test.h"
#include "mongo/util/log_with_sampling.h"
#include "mongo/util/scopeguard.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kTest
namespace mongo {
namespace {
/**
* Get the relevant parts of the environment into a specified state, run
* shouldLogSlowOpWithSampling(...) once, then restore the enviroment's state.
*
* `debugLogEnabled`: Select whether to log debug messages.
* Unless we're logging debug messages, we should only log the op if it's slow.
*
* `slowOp`: whether to simulate a slow op or a fast op relative to the test's chosen
* threshold of 10 milliseconds.
*
* `forceSample`: Set the slow op sampleRate to 0% or 100% to force sampled or not sampled op.
*/
auto scenario(bool debugLogEnabled, bool slowOp, bool forceSample) {
static const logv2::LogComponent component = logv2::LogComponent::kDefault;
const auto serviceContext = ServiceContext::make();
serviceContext->registerClientObserver(std::make_unique<LockerNoopClientObserver>());
const auto client = serviceContext->makeClient("log_with_sampling_test");
const auto opCtx = client->makeOperationContext();
auto loggedSeverityGuard = unittest::MinimumLoggedSeverityGuard(
component, debugLogEnabled ? logv2::LogSeverity::Debug(1) : logv2::LogSeverity::Info());
ScopeGuard sampleRateGuard([savedRate = serverGlobalParams.sampleRate.load()] {
serverGlobalParams.sampleRate.store(savedRate);
});
serverGlobalParams.sampleRate.store(forceSample ? 1.0 : 0.0);
return shouldLogSlowOpWithSampling(
opCtx.get(), component, Milliseconds{slowOp ? 11 : 9}, Milliseconds{10});
}
TEST(LogWithSamplingTest, SlowOpWithoutDebugLogging) {
{
auto [logSlow, sample] = scenario(false, true, true);
ASSERT_TRUE(logSlow) << "should log when sampled";
ASSERT_TRUE(sample) << "should sample when sampled";
}
{
auto [logSlow, sample] = scenario(false, true, false);
ASSERT_FALSE(logSlow) << "should not log when not sampled";
ASSERT_FALSE(sample) << "should not sample when not sampled";
}
}
TEST(LogWithSamplingTest, SlowOpWithDebugLogging) {
{
auto [logSlow, sample] = scenario(true, true, true);
ASSERT_TRUE(logSlow) << "should log when the op is slow.";
ASSERT_TRUE(sample) << "should sample when sampled";
}
{
auto [logSlow, sample] = scenario(true, true, false);
ASSERT_TRUE(logSlow) << "should still log even when not sampled";
ASSERT_FALSE(sample) << "should not sample even if should log";
}
}
TEST(LogWithSamplingTest, FastOpWithoutDebugLogging) {
{
auto [logSlow, sample] = scenario(false, false, true);
ASSERT_FALSE(logSlow) << "should not log when the op is fast.";
ASSERT_TRUE(sample) << "should sample when sampled";
}
{
auto [logSlow, sample] = scenario(false, false, false);
ASSERT_FALSE(logSlow) << "should not log when not sampled";
ASSERT_FALSE(sample) << "should not sample when not sampled";
}
}
} // namespace
} // namespace mongo
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