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// Copyright 2021 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/core/lib/resource_quota/periodic_update.h"
#include <stddef.h>
#include <memory>
#include <thread>
#include <vector>
#include "gtest/gtest.h"
#include <grpc/support/log.h>
#include <grpc/support/time.h>
#include "src/core/lib/iomgr/exec_ctx.h"
namespace grpc_core {
namespace testing {
TEST(PeriodicUpdateTest, SimpleTest) {
std::unique_ptr<PeriodicUpdate> upd;
Timestamp start;
Timestamp reset_start;
// Create a periodic update that updates every second.
{
ExecCtx exec_ctx;
upd = std::make_unique<PeriodicUpdate>(Duration::Seconds(1));
start = Timestamp::Now();
}
// Wait until the first period has elapsed.
bool done = false;
while (!done) {
ExecCtx exec_ctx;
upd->Tick([&](Duration elapsed) {
reset_start = Timestamp::Now();
EXPECT_GE(elapsed, Duration::Seconds(1));
done = true;
});
}
// Ensure that took at least 1 second.
{
ExecCtx exec_ctx;
EXPECT_GE(Timestamp::Now() - start, Duration::Seconds(1));
start = reset_start;
}
// Do ten more update cycles
for (int i = 0; i < 10; i++) {
done = false;
while (!done) {
ExecCtx exec_ctx;
upd->Tick([&](Duration) {
reset_start = Timestamp::Now();
EXPECT_GE(Timestamp::Now() - start, Duration::Seconds(1));
done = true;
});
}
// Ensure the time taken was between 1 and 3 seconds - we make a little
// allowance for the presumed inaccuracy of this type.
{
ExecCtx exec_ctx;
EXPECT_GE(Timestamp::Now() - start, Duration::Seconds(1));
EXPECT_LE(Timestamp::Now() - start, Duration::Seconds(3));
start = reset_start;
}
}
}
TEST(PeriodicUpdate, ThreadTest) {
std::unique_ptr<PeriodicUpdate> upd;
std::atomic<int> count(0);
Timestamp start;
// Create a periodic update that updates every second.
{
ExecCtx exec_ctx;
upd = std::make_unique<PeriodicUpdate>(Duration::Seconds(1));
start = Timestamp::Now();
}
// Run ten threads all updating the counter continuously, for a total of ten
// update cycles.
// This allows TSAN to catch threading issues.
std::vector<std::thread> threads;
for (size_t i = 0; i < 10; i++) {
threads.push_back(std::thread([&]() {
while (count.load() < 10) {
ExecCtx exec_ctx;
upd->Tick([&](Duration d) {
EXPECT_GE(d, Duration::Seconds(1));
count.fetch_add(1);
});
}
}));
}
// Finish all threads.
for (auto& th : threads) {
th.join();
}
// Ensure our ten cycles took at least 10 seconds, and no more than 30.
{
ExecCtx exec_ctx;
EXPECT_GE(Timestamp::Now() - start, Duration::Seconds(10));
EXPECT_LE(Timestamp::Now() - start, Duration::Seconds(30));
}
}
} // namespace testing
} // namespace grpc_core
// Hook needed to run ExecCtx outside of iomgr.
void grpc_set_default_iomgr_platform() {}
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
gpr_log_verbosity_init();
gpr_time_init();
return RUN_ALL_TESTS();
}
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