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/*
*
* Copyright 2018 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/ext/filters/client_channel/retry_throttle.h"
#include <gtest/gtest.h>
#include "test/core/util/test_config.h"
namespace grpc_core {
namespace internal {
namespace {
TEST(ServerRetryThrottleData, Basic) {
// Max token count is 4, so threshold for retrying is 2.
// Token count starts at 4.
// Each failure decrements by 1. Each success increments by 1.6.
auto throttle_data =
MakeRefCounted<ServerRetryThrottleData>(4000, 1600, nullptr);
// Failure: token_count=3. Above threshold.
EXPECT_TRUE(throttle_data->RecordFailure());
// Success: token_count=4. Not incremented beyond max.
throttle_data->RecordSuccess();
// Failure: token_count=3. Above threshold.
EXPECT_TRUE(throttle_data->RecordFailure());
// Failure: token_count=2. At threshold, so no retries.
EXPECT_FALSE(throttle_data->RecordFailure());
// Failure: token_count=1. Below threshold, so no retries.
EXPECT_FALSE(throttle_data->RecordFailure());
// Failure: token_count=0. Below threshold, so no retries.
EXPECT_FALSE(throttle_data->RecordFailure());
// Failure: token_count=0. Below threshold, so no retries. Not
// decremented below min.
EXPECT_FALSE(throttle_data->RecordFailure());
// Success: token_count=1.6.
throttle_data->RecordSuccess();
// Success: token_count=3.2.
throttle_data->RecordSuccess();
// Failure: token_count=2.2. Above threshold.
EXPECT_TRUE(throttle_data->RecordFailure());
// Failure: token_count=1.2. Below threshold, so no retries.
EXPECT_FALSE(throttle_data->RecordFailure());
// Success: token_count=2.8.
throttle_data->RecordSuccess();
// Failure: token_count=1.8. Below threshold, so no retries.
EXPECT_FALSE(throttle_data->RecordFailure());
// Success: token_count=3.4.
throttle_data->RecordSuccess();
// Failure: token_count=2.4. Above threshold.
EXPECT_TRUE(throttle_data->RecordFailure());
}
TEST(ServerRetryThrottleData, Replacement) {
// Create old throttle data.
// Max token count is 4, so threshold for retrying is 2.
// Token count starts at 4.
// Each failure decrements by 1. Each success increments by 1.
auto old_throttle_data =
MakeRefCounted<ServerRetryThrottleData>(4000, 1000, nullptr);
// Failure: token_count=3. Above threshold.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Create new throttle data.
// Max token count is 10, so threshold for retrying is 5.
// Token count starts at 7.5 (ratio inherited from old_throttle_data).
// Each failure decrements by 1. Each success increments by 3.
auto throttle_data = MakeRefCounted<ServerRetryThrottleData>(
10000, 3000, old_throttle_data.get());
// Failure via old_throttle_data: token_count=6.5.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Failure: token_count=5.5.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Failure via old_throttle_data: token_count=4.5. Below threshold.
EXPECT_FALSE(old_throttle_data->RecordFailure());
// Failure: token_count=3.5. Below threshold.
EXPECT_FALSE(throttle_data->RecordFailure());
// Success: token_count=6.5.
throttle_data->RecordSuccess();
// Failure via old_throttle_data: token_count=5.5. Above threshold.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Failure: token_count=4.5. Below threshold.
EXPECT_FALSE(throttle_data->RecordFailure());
}
TEST(ServerRetryThrottleMap, Replacement) {
ServerRetryThrottleMap::Init();
const char kServerName[] = "server_name";
// Create old throttle data.
// Max token count is 4, so threshold for retrying is 2.
// Token count starts at 4.
// Each failure decrements by 1. Each success increments by 1.
auto old_throttle_data =
ServerRetryThrottleMap::GetDataForServer(kServerName, 4000, 1000);
// Failure: token_count=3. Above threshold.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Create new throttle data.
// Max token count is 10, so threshold for retrying is 5.
// Token count starts at 7.5 (ratio inherited from old_throttle_data).
// Each failure decrements by 1. Each success increments by 3.
auto throttle_data =
ServerRetryThrottleMap::GetDataForServer(kServerName, 10000, 3000);
// Failure via old_throttle_data: token_count=6.5.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Failure: token_count=5.5.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Failure via old_throttle_data: token_count=4.5. Below threshold.
EXPECT_FALSE(old_throttle_data->RecordFailure());
// Failure: token_count=3.5. Below threshold.
EXPECT_FALSE(throttle_data->RecordFailure());
// Success: token_count=6.5.
throttle_data->RecordSuccess();
// Failure via old_throttle_data: token_count=5.5. Above threshold.
EXPECT_TRUE(old_throttle_data->RecordFailure());
// Failure: token_count=4.5. Below threshold.
EXPECT_FALSE(throttle_data->RecordFailure());
// Clean up.
ServerRetryThrottleMap::Shutdown();
}
} // namespace
} // namespace internal
} // namespace grpc_core
int main(int argc, char** argv) {
grpc::testing::TestEnvironment env(argc, argv);
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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