| // |
| // Copyright 2023 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/lb_policy/ring_hash/ring_hash.h" |
| |
| #include <stdint.h> |
| |
| #include <algorithm> |
| #include <array> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "absl/status/status.h" |
| #include "absl/strings/str_cat.h" |
| #include "absl/strings/string_view.h" |
| #include "absl/strings/strip.h" |
| #include "absl/types/optional.h" |
| #include "gtest/gtest.h" |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/json.h> |
| |
| #include "src/core/lib/gprpp/ref_counted_ptr.h" |
| #include "src/core/lib/gprpp/xxhash_inline.h" |
| #include "src/core/lib/json/json.h" |
| #include "src/core/lib/load_balancing/lb_policy.h" |
| #include "src/core/lib/resolver/endpoint_addresses.h" |
| #include "test/core/client_channel/lb_policy/lb_policy_test_lib.h" |
| #include "test/core/util/test_config.h" |
| |
| namespace grpc_core { |
| namespace testing { |
| namespace { |
| |
| // TODO(roth): I created this file when I fixed a bug and wrote only a |
| // very basic test and the test needed for that bug. When we have time, |
| // we need a lot more tests here to cover all of the policy's functionality. |
| |
| class RingHashTest : public LoadBalancingPolicyTest { |
| protected: |
| RingHashTest() : LoadBalancingPolicyTest("ring_hash_experimental") {} |
| |
| static RefCountedPtr<LoadBalancingPolicy::Config> MakeRingHashConfig( |
| int min_ring_size = 0, int max_ring_size = 0) { |
| Json::Object fields; |
| if (min_ring_size > 0) { |
| fields["minRingSize"] = Json::FromString(absl::StrCat(min_ring_size)); |
| } |
| if (max_ring_size > 0) { |
| fields["maxRingSize"] = Json::FromString(absl::StrCat(max_ring_size)); |
| } |
| return MakeConfig(Json::FromArray({Json::FromObject( |
| {{"ring_hash_experimental", Json::FromObject(fields)}})})); |
| } |
| |
| RequestHashAttribute* MakeHashAttribute(absl::string_view address) { |
| std::string hash_input = |
| absl::StrCat(absl::StripPrefix(address, "ipv4:"), "_0"); |
| uint64_t hash = XXH64(hash_input.data(), hash_input.size(), 0); |
| attribute_storage_.emplace_back( |
| std::make_unique<RequestHashAttribute>(hash)); |
| return attribute_storage_.back().get(); |
| } |
| |
| std::vector<std::unique_ptr<RequestHashAttribute>> attribute_storage_; |
| }; |
| |
| TEST_F(RingHashTest, Basic) { |
| const std::array<absl::string_view, 3> kAddresses = { |
| "ipv4:127.0.0.1:441", "ipv4:127.0.0.1:442", "ipv4:127.0.0.1:443"}; |
| EXPECT_EQ( |
| ApplyUpdate(BuildUpdate(kAddresses, MakeRingHashConfig()), lb_policy()), |
| absl::OkStatus()); |
| auto picker = ExpectState(GRPC_CHANNEL_IDLE); |
| auto* address0_attribute = MakeHashAttribute(kAddresses[0]); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| WaitForWorkSerializerToFlush(); |
| WaitForWorkSerializerToFlush(); |
| auto* subchannel = FindSubchannel(kAddresses[0]); |
| ASSERT_NE(subchannel, nullptr); |
| EXPECT_TRUE(subchannel->ConnectionRequested()); |
| subchannel->SetConnectivityState(GRPC_CHANNEL_CONNECTING); |
| picker = ExpectState(GRPC_CHANNEL_CONNECTING); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| subchannel->SetConnectivityState(GRPC_CHANNEL_READY); |
| picker = ExpectState(GRPC_CHANNEL_READY); |
| auto address = ExpectPickComplete(picker.get(), {address0_attribute}); |
| EXPECT_EQ(address, kAddresses[0]); |
| } |
| |
| TEST_F(RingHashTest, SameAddressListedMultipleTimes) { |
| const std::array<absl::string_view, 3> kAddresses = { |
| "ipv4:127.0.0.1:441", "ipv4:127.0.0.1:442", "ipv4:127.0.0.1:441"}; |
| EXPECT_EQ( |
| ApplyUpdate(BuildUpdate(kAddresses, MakeRingHashConfig()), lb_policy()), |
| absl::OkStatus()); |
| auto picker = ExpectState(GRPC_CHANNEL_IDLE); |
| auto* address0_attribute = MakeHashAttribute(kAddresses[0]); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| WaitForWorkSerializerToFlush(); |
| WaitForWorkSerializerToFlush(); |
| auto* subchannel = FindSubchannel(kAddresses[0]); |
| ASSERT_NE(subchannel, nullptr); |
| EXPECT_TRUE(subchannel->ConnectionRequested()); |
| subchannel->SetConnectivityState(GRPC_CHANNEL_CONNECTING); |
| picker = ExpectState(GRPC_CHANNEL_CONNECTING); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| subchannel->SetConnectivityState(GRPC_CHANNEL_READY); |
| picker = ExpectState(GRPC_CHANNEL_READY); |
| auto address = ExpectPickComplete(picker.get(), {address0_attribute}); |
| EXPECT_EQ(address, kAddresses[0]); |
| } |
| |
| TEST_F(RingHashTest, MultipleAddressesPerEndpoint) { |
| constexpr std::array<absl::string_view, 2> kEndpoint1Addresses = { |
| "ipv4:127.0.0.1:443", "ipv4:127.0.0.1:444"}; |
| constexpr std::array<absl::string_view, 2> kEndpoint2Addresses = { |
| "ipv4:127.0.0.1:445", "ipv4:127.0.0.1:446"}; |
| const std::array<EndpointAddresses, 2> kEndpoints = { |
| MakeEndpointAddresses(kEndpoint1Addresses), |
| MakeEndpointAddresses(kEndpoint2Addresses)}; |
| EXPECT_EQ( |
| ApplyUpdate(BuildUpdate(kEndpoints, MakeRingHashConfig()), lb_policy()), |
| absl::OkStatus()); |
| auto picker = ExpectState(GRPC_CHANNEL_IDLE); |
| // Normal connection to first address of the first endpoint. |
| auto* address0_attribute = MakeHashAttribute(kEndpoint1Addresses[0]); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| WaitForWorkSerializerToFlush(); |
| WaitForWorkSerializerToFlush(); |
| auto* subchannel = FindSubchannel(kEndpoint1Addresses[0]); |
| ASSERT_NE(subchannel, nullptr); |
| EXPECT_TRUE(subchannel->ConnectionRequested()); |
| auto* subchannel2 = FindSubchannel(kEndpoint1Addresses[1]); |
| ASSERT_NE(subchannel2, nullptr); |
| EXPECT_FALSE(subchannel2->ConnectionRequested()); |
| subchannel->SetConnectivityState(GRPC_CHANNEL_CONNECTING); |
| picker = ExpectState(GRPC_CHANNEL_CONNECTING); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| subchannel->SetConnectivityState(GRPC_CHANNEL_READY); |
| picker = ExpectState(GRPC_CHANNEL_READY); |
| auto address = ExpectPickComplete(picker.get(), {address0_attribute}); |
| EXPECT_EQ(address, kEndpoint1Addresses[0]); |
| // Now that connection fails. |
| subchannel->SetConnectivityState(GRPC_CHANNEL_IDLE); |
| ExpectReresolutionRequest(); |
| picker = ExpectState(GRPC_CHANNEL_IDLE); |
| EXPECT_FALSE(subchannel->ConnectionRequested()); |
| EXPECT_FALSE(subchannel2->ConnectionRequested()); |
| // The LB policy will try to reconnect when it gets another pick. |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| WaitForWorkSerializerToFlush(); |
| WaitForWorkSerializerToFlush(); |
| EXPECT_TRUE(subchannel->ConnectionRequested()); |
| subchannel->SetConnectivityState(GRPC_CHANNEL_CONNECTING); |
| picker = ExpectState(GRPC_CHANNEL_CONNECTING); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| // The connection attempt fails. |
| subchannel->SetConnectivityState(GRPC_CHANNEL_TRANSIENT_FAILURE, |
| absl::UnavailableError("ugh")); |
| // The PF child policy will try to connect to the second address for the |
| // endpoint. |
| EXPECT_TRUE(subchannel2->ConnectionRequested()); |
| subchannel2->SetConnectivityState(GRPC_CHANNEL_CONNECTING); |
| picker = ExpectState(GRPC_CHANNEL_CONNECTING); |
| ExpectPickQueued(picker.get(), {address0_attribute}); |
| subchannel2->SetConnectivityState(GRPC_CHANNEL_READY); |
| picker = ExpectState(GRPC_CHANNEL_READY); |
| address = ExpectPickComplete(picker.get(), {address0_attribute}); |
| EXPECT_EQ(address, kEndpoint1Addresses[1]); |
| } |
| |
| } // namespace |
| } // namespace testing |
| } // namespace grpc_core |
| |
| int main(int argc, char** argv) { |
| ::testing::InitGoogleTest(&argc, argv); |
| grpc::testing::TestEnvironment env(&argc, argv); |
| return RUN_ALL_TESTS(); |
| } |