| /* |
| * |
| * Copyright 2017 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 <memory> |
| #include <mutex> |
| #include <sstream> |
| #include <thread> |
| |
| #include <grpc++/channel.h> |
| #include <grpc++/client_context.h> |
| #include <grpc++/create_channel.h> |
| #include <grpc++/server.h> |
| #include <grpc++/server_builder.h> |
| #include <grpc/grpc.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/thd.h> |
| #include <grpc/support/time.h> |
| |
| extern "C" { |
| #include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h" |
| #include "src/core/lib/iomgr/sockaddr.h" |
| } |
| |
| #include "test/core/util/port.h" |
| #include "test/core/util/test_config.h" |
| #include "test/cpp/end2end/test_service_impl.h" |
| |
| #include "src/proto/grpc/lb/v1/load_balancer.grpc.pb.h" |
| #include "src/proto/grpc/testing/echo.grpc.pb.h" |
| |
| #include <gmock/gmock.h> |
| #include <gtest/gtest.h> |
| |
| // TODO(dgq): Other scenarios in need of testing: |
| // - Send a serverlist with faulty ip:port addresses (port > 2^16, etc). |
| // - Test reception of invalid serverlist |
| // - Test pinging |
| // - Test against a non-LB server. |
| // - Random LB server closing the stream unexpectedly. |
| // - Test using DNS-resolvable names (localhost?) |
| // - Test handling of creation of faulty RR instance by having the LB return a |
| // serverlist with non-existent backends after having initially returned a |
| // valid one. |
| // |
| // Findings from end to end testing to be covered here: |
| // - Handling of LB servers restart, including reconnection after backing-off |
| // retries. |
| // - Destruction of load balanced channel (and therefore of grpclb instance) |
| // while: |
| // 1) the internal LB call is still active. This should work by virtue |
| // of the weak reference the LB call holds. The call should be terminated as |
| // part of the grpclb shutdown process. |
| // 2) the retry timer is active. Again, the weak reference it holds should |
| // prevent a premature call to \a glb_destroy. |
| // - Restart of backend servers with no changes to serverlist. This exercises |
| // the RR handover mechanism. |
| |
| using std::chrono::system_clock; |
| |
| using grpc::lb::v1::LoadBalanceRequest; |
| using grpc::lb::v1::LoadBalanceResponse; |
| using grpc::lb::v1::LoadBalancer; |
| |
| namespace grpc { |
| namespace testing { |
| namespace { |
| |
| template <typename ServiceType> |
| class CountedService : public ServiceType { |
| public: |
| size_t request_count() { |
| std::unique_lock<std::mutex> lock(mu_); |
| return request_count_; |
| } |
| |
| size_t response_count() { |
| std::unique_lock<std::mutex> lock(mu_); |
| return response_count_; |
| } |
| |
| void IncreaseResponseCount() { |
| std::unique_lock<std::mutex> lock(mu_); |
| ++response_count_; |
| } |
| void IncreaseRequestCount() { |
| std::unique_lock<std::mutex> lock(mu_); |
| ++request_count_; |
| } |
| |
| void ResetCounters() { |
| std::unique_lock<std::mutex> lock(mu_); |
| request_count_ = 0; |
| response_count_ = 0; |
| } |
| |
| protected: |
| std::mutex mu_; |
| |
| private: |
| size_t request_count_ = 0; |
| size_t response_count_ = 0; |
| }; |
| |
| using BackendService = CountedService<TestServiceImpl>; |
| using BalancerService = CountedService<LoadBalancer::Service>; |
| |
| class BackendServiceImpl : public BackendService { |
| public: |
| BackendServiceImpl() {} |
| |
| Status Echo(ServerContext* context, const EchoRequest* request, |
| EchoResponse* response) override { |
| IncreaseRequestCount(); |
| const auto status = TestServiceImpl::Echo(context, request, response); |
| IncreaseResponseCount(); |
| return status; |
| } |
| |
| // Returns true on its first invocation, false otherwise. |
| bool Shutdown() { |
| std::unique_lock<std::mutex> lock(mu_); |
| const bool prev = !shutdown_; |
| shutdown_ = true; |
| gpr_log(GPR_INFO, "Backend: shut down"); |
| return prev; |
| } |
| |
| private: |
| std::mutex mu_; |
| bool shutdown_ = false; |
| }; |
| |
| grpc::string Ip4ToPackedString(const char* ip_str) { |
| struct in_addr ip4; |
| GPR_ASSERT(inet_pton(AF_INET, ip_str, &ip4) == 1); |
| return grpc::string(reinterpret_cast<const char*>(&ip4), sizeof(ip4)); |
| } |
| |
| struct ClientStats { |
| size_t num_calls_started = 0; |
| size_t num_calls_finished = 0; |
| size_t num_calls_finished_with_client_failed_to_send = 0; |
| size_t num_calls_finished_known_received = 0; |
| std::map<grpc::string, size_t> drop_token_counts; |
| |
| ClientStats& operator+=(const ClientStats& other) { |
| num_calls_started += other.num_calls_started; |
| num_calls_finished += other.num_calls_finished; |
| num_calls_finished_with_client_failed_to_send += |
| other.num_calls_finished_with_client_failed_to_send; |
| num_calls_finished_known_received += |
| other.num_calls_finished_known_received; |
| for (const auto& p : other.drop_token_counts) { |
| drop_token_counts[p.first] += p.second; |
| } |
| return *this; |
| } |
| }; |
| |
| class BalancerServiceImpl : public BalancerService { |
| public: |
| using Stream = ServerReaderWriter<LoadBalanceResponse, LoadBalanceRequest>; |
| using ResponseDelayPair = std::pair<LoadBalanceResponse, int>; |
| |
| explicit BalancerServiceImpl(int client_load_reporting_interval_seconds) |
| : client_load_reporting_interval_seconds_( |
| client_load_reporting_interval_seconds), |
| shutdown_(false) {} |
| |
| Status BalanceLoad(ServerContext* context, Stream* stream) override { |
| gpr_log(GPR_INFO, "LB[%p]: BalanceLoad", this); |
| LoadBalanceRequest request; |
| stream->Read(&request); |
| IncreaseRequestCount(); |
| gpr_log(GPR_INFO, "LB[%p]: recv msg '%s'", this, |
| request.DebugString().c_str()); |
| |
| if (client_load_reporting_interval_seconds_ > 0) { |
| LoadBalanceResponse initial_response; |
| initial_response.mutable_initial_response() |
| ->mutable_client_stats_report_interval() |
| ->set_seconds(client_load_reporting_interval_seconds_); |
| stream->Write(initial_response); |
| } |
| |
| std::vector<ResponseDelayPair> responses_and_delays; |
| { |
| std::unique_lock<std::mutex> lock(mu_); |
| responses_and_delays = responses_and_delays_; |
| } |
| for (const auto& response_and_delay : responses_and_delays) { |
| { |
| std::unique_lock<std::mutex> lock(mu_); |
| if (shutdown_) goto done; |
| } |
| SendResponse(stream, response_and_delay.first, response_and_delay.second); |
| } |
| { |
| std::unique_lock<std::mutex> lock(mu_); |
| if (shutdown_) goto done; |
| serverlist_cond_.wait(lock, [this] { return serverlist_ready_; }); |
| serverlist_ready_ = false; |
| } |
| |
| if (client_load_reporting_interval_seconds_ > 0) { |
| request.Clear(); |
| stream->Read(&request); |
| gpr_log(GPR_INFO, "LB[%p]: recv client load report msg: '%s'", this, |
| request.DebugString().c_str()); |
| GPR_ASSERT(request.has_client_stats()); |
| // We need to acquire the lock here in order to prevent the notify_one |
| // below from firing before its corresponding wait is executed. |
| std::lock_guard<std::mutex> lock(mu_); |
| client_stats_.num_calls_started += |
| request.client_stats().num_calls_started(); |
| client_stats_.num_calls_finished += |
| request.client_stats().num_calls_finished(); |
| client_stats_.num_calls_finished_with_client_failed_to_send += |
| request.client_stats() |
| .num_calls_finished_with_client_failed_to_send(); |
| client_stats_.num_calls_finished_known_received += |
| request.client_stats().num_calls_finished_known_received(); |
| for (const auto& drop_token_count : |
| request.client_stats().calls_finished_with_drop()) { |
| client_stats_ |
| .drop_token_counts[drop_token_count.load_balance_token()] += |
| drop_token_count.num_calls(); |
| } |
| load_report_ready_ = true; |
| load_report_cond_.notify_one(); |
| } |
| done: |
| gpr_log(GPR_INFO, "LB[%p]: done", this); |
| return Status::OK; |
| } |
| |
| void add_response(const LoadBalanceResponse& response, int send_after_ms) { |
| std::unique_lock<std::mutex> lock(mu_); |
| responses_and_delays_.push_back(std::make_pair(response, send_after_ms)); |
| } |
| |
| // Returns true on its first invocation, false otherwise. |
| bool Shutdown() { |
| NotifyDoneWithServerlists(); |
| std::unique_lock<std::mutex> lock(mu_); |
| const bool prev = !shutdown_; |
| shutdown_ = true; |
| gpr_log(GPR_INFO, "LB[%p]: shut down", this); |
| return prev; |
| } |
| |
| static LoadBalanceResponse BuildResponseForBackends( |
| const std::vector<int>& backend_ports, |
| const std::map<grpc::string, size_t>& drop_token_counts) { |
| LoadBalanceResponse response; |
| for (const auto& drop_token_count : drop_token_counts) { |
| for (size_t i = 0; i < drop_token_count.second; ++i) { |
| auto* server = response.mutable_server_list()->add_servers(); |
| server->set_drop(true); |
| server->set_load_balance_token(drop_token_count.first); |
| } |
| } |
| for (const int& backend_port : backend_ports) { |
| auto* server = response.mutable_server_list()->add_servers(); |
| server->set_ip_address(Ip4ToPackedString("127.0.0.1")); |
| server->set_port(backend_port); |
| } |
| return response; |
| } |
| |
| const ClientStats& WaitForLoadReport() { |
| std::unique_lock<std::mutex> lock(mu_); |
| load_report_cond_.wait(lock, [this] { return load_report_ready_; }); |
| load_report_ready_ = false; |
| return client_stats_; |
| } |
| |
| void NotifyDoneWithServerlists() { |
| std::lock_guard<std::mutex> lock(mu_); |
| serverlist_ready_ = true; |
| serverlist_cond_.notify_one(); |
| } |
| |
| private: |
| void SendResponse(Stream* stream, const LoadBalanceResponse& response, |
| int delay_ms) { |
| gpr_log(GPR_INFO, "LB[%p]: sleeping for %d ms...", this, delay_ms); |
| if (delay_ms > 0) { |
| gpr_sleep_until( |
| gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), |
| gpr_time_from_millis(delay_ms, GPR_TIMESPAN))); |
| } |
| gpr_log(GPR_INFO, "LB[%p]: Woke up! Sending response '%s'", this, |
| response.DebugString().c_str()); |
| IncreaseResponseCount(); |
| stream->Write(response); |
| } |
| |
| const int client_load_reporting_interval_seconds_; |
| std::vector<ResponseDelayPair> responses_and_delays_; |
| std::mutex mu_; |
| std::condition_variable load_report_cond_; |
| bool load_report_ready_ = false; |
| std::condition_variable serverlist_cond_; |
| bool serverlist_ready_ = false; |
| ClientStats client_stats_; |
| bool shutdown_; |
| }; |
| |
| class GrpclbEnd2endTest : public ::testing::Test { |
| protected: |
| GrpclbEnd2endTest(int num_backends, int num_balancers, |
| int client_load_reporting_interval_seconds) |
| : server_host_("localhost"), |
| num_backends_(num_backends), |
| num_balancers_(num_balancers), |
| client_load_reporting_interval_seconds_( |
| client_load_reporting_interval_seconds) {} |
| |
| void SetUp() override { |
| response_generator_ = grpc_fake_resolver_response_generator_create(); |
| // Start the backends. |
| for (size_t i = 0; i < num_backends_; ++i) { |
| backends_.emplace_back(new BackendServiceImpl()); |
| backend_servers_.emplace_back(ServerThread<BackendService>( |
| "backend", server_host_, backends_.back().get())); |
| } |
| // Start the load balancers. |
| for (size_t i = 0; i < num_balancers_; ++i) { |
| balancers_.emplace_back( |
| new BalancerServiceImpl(client_load_reporting_interval_seconds_)); |
| balancer_servers_.emplace_back(ServerThread<BalancerService>( |
| "balancer", server_host_, balancers_.back().get())); |
| } |
| ResetStub(); |
| std::vector<AddressData> addresses; |
| for (size_t i = 0; i < balancer_servers_.size(); ++i) { |
| addresses.emplace_back(AddressData{balancer_servers_[i].port_, true, ""}); |
| } |
| SetNextResolution(addresses); |
| } |
| |
| void TearDown() override { |
| for (size_t i = 0; i < backends_.size(); ++i) { |
| if (backends_[i]->Shutdown()) backend_servers_[i].Shutdown(); |
| } |
| for (size_t i = 0; i < balancers_.size(); ++i) { |
| if (balancers_[i]->Shutdown()) balancer_servers_[i].Shutdown(); |
| } |
| grpc_fake_resolver_response_generator_unref(response_generator_); |
| } |
| |
| void ResetStub(int fallback_timeout = 0) { |
| ChannelArguments args; |
| args.SetGrpclbFallbackTimeout(fallback_timeout); |
| args.SetPointer(GRPC_ARG_FAKE_RESOLVER_RESPONSE_GENERATOR, |
| response_generator_); |
| std::ostringstream uri; |
| uri << "fake:///servername_not_used"; |
| channel_ = |
| CreateCustomChannel(uri.str(), InsecureChannelCredentials(), args); |
| stub_ = grpc::testing::EchoTestService::NewStub(channel_); |
| } |
| |
| void ResetBackendCounters() { |
| for (const auto& backend : backends_) backend->ResetCounters(); |
| } |
| |
| ClientStats WaitForLoadReports() { |
| ClientStats client_stats; |
| for (const auto& balancer : balancers_) { |
| client_stats += balancer->WaitForLoadReport(); |
| } |
| return client_stats; |
| } |
| |
| bool SeenAllBackends() { |
| for (const auto& backend : backends_) { |
| if (backend->request_count() == 0) return false; |
| } |
| return true; |
| } |
| |
| void SendRpcAndCount(int* num_total, int* num_ok, int* num_failure, |
| int* num_drops) { |
| const Status status = SendRpc(); |
| if (status.ok()) { |
| ++*num_ok; |
| } else { |
| if (status.error_message() == "Call dropped by load balancing policy") { |
| ++*num_drops; |
| } else { |
| ++*num_failure; |
| } |
| } |
| ++*num_total; |
| } |
| |
| std::tuple<int, int, int> WaitForAllBackends( |
| int num_requests_multiple_of = 1) { |
| int num_ok = 0; |
| int num_failure = 0; |
| int num_drops = 0; |
| int num_total = 0; |
| while (!SeenAllBackends()) { |
| SendRpcAndCount(&num_total, &num_ok, &num_failure, &num_drops); |
| } |
| while (num_total % num_requests_multiple_of != 0) { |
| SendRpcAndCount(&num_total, &num_ok, &num_failure, &num_drops); |
| } |
| ResetBackendCounters(); |
| gpr_log(GPR_INFO, |
| "Performed %d warm up requests (a multiple of %d) against the " |
| "backends. %d succeeded, %d failed, %d dropped.", |
| num_total, num_requests_multiple_of, num_ok, num_failure, |
| num_drops); |
| return std::make_tuple(num_ok, num_failure, num_drops); |
| } |
| |
| void WaitForBackend(size_t backend_idx) { |
| do { |
| CheckRpcSendOk(); |
| } while (backends_[backend_idx]->request_count() == 0); |
| ResetBackendCounters(); |
| } |
| |
| struct AddressData { |
| int port; |
| bool is_balancer; |
| grpc::string balancer_name; |
| }; |
| |
| void SetNextResolution(const std::vector<AddressData>& address_data) { |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_lb_addresses* addresses = |
| grpc_lb_addresses_create(address_data.size(), nullptr); |
| for (size_t i = 0; i < address_data.size(); ++i) { |
| char* lb_uri_str; |
| gpr_asprintf(&lb_uri_str, "ipv4:127.0.0.1:%d", address_data[i].port); |
| grpc_uri* lb_uri = grpc_uri_parse(&exec_ctx, lb_uri_str, true); |
| GPR_ASSERT(lb_uri != nullptr); |
| grpc_lb_addresses_set_address_from_uri( |
| addresses, i, lb_uri, address_data[i].is_balancer, |
| address_data[i].balancer_name.c_str(), nullptr); |
| grpc_uri_destroy(lb_uri); |
| gpr_free(lb_uri_str); |
| } |
| grpc_arg fake_addresses = grpc_lb_addresses_create_channel_arg(addresses); |
| grpc_channel_args fake_result = {1, &fake_addresses}; |
| grpc_fake_resolver_response_generator_set_response( |
| &exec_ctx, response_generator_, &fake_result); |
| grpc_lb_addresses_destroy(&exec_ctx, addresses); |
| grpc_exec_ctx_finish(&exec_ctx); |
| } |
| |
| const std::vector<int> GetBackendPorts(const size_t start_index = 0) const { |
| std::vector<int> backend_ports; |
| for (size_t i = start_index; i < backend_servers_.size(); ++i) { |
| backend_ports.push_back(backend_servers_[i].port_); |
| } |
| return backend_ports; |
| } |
| |
| void ScheduleResponseForBalancer(size_t i, |
| const LoadBalanceResponse& response, |
| int delay_ms) { |
| balancers_.at(i)->add_response(response, delay_ms); |
| } |
| |
| Status SendRpc(EchoResponse* response = nullptr, int timeout_ms = 1000) { |
| const bool local_response = (response == nullptr); |
| if (local_response) response = new EchoResponse; |
| EchoRequest request; |
| request.set_message(kRequestMessage_); |
| ClientContext context; |
| context.set_deadline(grpc_timeout_milliseconds_to_deadline(timeout_ms)); |
| Status status = stub_->Echo(&context, request, response); |
| if (local_response) delete response; |
| return status; |
| } |
| |
| void CheckRpcSendOk(const size_t times = 1) { |
| for (size_t i = 0; i < times; ++i) { |
| EchoResponse response; |
| const Status status = SendRpc(&response); |
| EXPECT_TRUE(status.ok()) << "code=" << status.error_code() |
| << " message=" << status.error_message(); |
| EXPECT_EQ(response.message(), kRequestMessage_); |
| } |
| } |
| |
| void CheckRpcSendFailure() { |
| const Status status = SendRpc(); |
| EXPECT_FALSE(status.ok()); |
| } |
| |
| template <typename T> |
| struct ServerThread { |
| explicit ServerThread(const grpc::string& type, |
| const grpc::string& server_host, T* service) |
| : type_(type), service_(service) { |
| std::mutex mu; |
| // We need to acquire the lock here in order to prevent the notify_one |
| // by ServerThread::Start from firing before the wait below is hit. |
| std::unique_lock<std::mutex> lock(mu); |
| port_ = grpc_pick_unused_port_or_die(); |
| gpr_log(GPR_INFO, "starting %s server on port %d", type_.c_str(), port_); |
| std::condition_variable cond; |
| thread_.reset(new std::thread( |
| std::bind(&ServerThread::Start, this, server_host, &mu, &cond))); |
| cond.wait(lock); |
| gpr_log(GPR_INFO, "%s server startup complete", type_.c_str()); |
| } |
| |
| void Start(const grpc::string& server_host, std::mutex* mu, |
| std::condition_variable* cond) { |
| // We need to acquire the lock here in order to prevent the notify_one |
| // below from firing before its corresponding wait is executed. |
| std::lock_guard<std::mutex> lock(*mu); |
| std::ostringstream server_address; |
| server_address << server_host << ":" << port_; |
| ServerBuilder builder; |
| builder.AddListeningPort(server_address.str(), |
| InsecureServerCredentials()); |
| builder.RegisterService(service_); |
| server_ = builder.BuildAndStart(); |
| cond->notify_one(); |
| } |
| |
| void Shutdown() { |
| gpr_log(GPR_INFO, "%s about to shutdown", type_.c_str()); |
| server_->Shutdown(grpc_timeout_milliseconds_to_deadline(0)); |
| thread_->join(); |
| gpr_log(GPR_INFO, "%s shutdown completed", type_.c_str()); |
| } |
| |
| int port_; |
| grpc::string type_; |
| std::unique_ptr<Server> server_; |
| T* service_; |
| std::unique_ptr<std::thread> thread_; |
| }; |
| |
| const grpc::string server_host_; |
| const size_t num_backends_; |
| const size_t num_balancers_; |
| const int client_load_reporting_interval_seconds_; |
| std::shared_ptr<Channel> channel_; |
| std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_; |
| std::vector<std::unique_ptr<BackendServiceImpl>> backends_; |
| std::vector<std::unique_ptr<BalancerServiceImpl>> balancers_; |
| std::vector<ServerThread<BackendService>> backend_servers_; |
| std::vector<ServerThread<BalancerService>> balancer_servers_; |
| grpc_fake_resolver_response_generator* response_generator_; |
| const grpc::string kRequestMessage_ = "Live long and prosper."; |
| }; |
| |
| class SingleBalancerTest : public GrpclbEnd2endTest { |
| public: |
| SingleBalancerTest() : GrpclbEnd2endTest(4, 1, 0) {} |
| }; |
| |
| TEST_F(SingleBalancerTest, Vanilla) { |
| const size_t kNumRpcsPerAddress = 100; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts(), {}), |
| 0); |
| // Make sure that trying to connect works without a call. |
| channel_->GetState(true /* try_to_connect */); |
| // We need to wait for all backends to come online. |
| WaitForAllBackends(); |
| // Send kNumRpcsPerAddress RPCs per server. |
| CheckRpcSendOk(kNumRpcsPerAddress * num_backends_); |
| |
| // Each backend should have gotten 100 requests. |
| for (size_t i = 0; i < backends_.size(); ++i) { |
| EXPECT_EQ(kNumRpcsPerAddress, |
| backend_servers_[i].service_->request_count()); |
| } |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| |
| // Check LB policy name for the channel. |
| EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(SingleBalancerTest, InitiallyEmptyServerlist) { |
| const int kServerlistDelayMs = 500 * grpc_test_slowdown_factor(); |
| const int kCallDeadlineMs = 1000 * grpc_test_slowdown_factor(); |
| |
| // First response is an empty serverlist, sent right away. |
| ScheduleResponseForBalancer(0, LoadBalanceResponse(), 0); |
| // Send non-empty serverlist only after kServerlistDelayMs |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts(), {}), |
| kServerlistDelayMs); |
| |
| const auto t0 = system_clock::now(); |
| // Client will block: LB will initially send empty serverlist. |
| CheckRpcSendOk(num_backends_); |
| const auto ellapsed_ms = |
| std::chrono::duration_cast<std::chrono::milliseconds>( |
| system_clock::now() - t0); |
| // but eventually, the LB sends a serverlist update that allows the call to |
| // proceed. The call delay must be larger than the delay in sending the |
| // populated serverlist but under the call's deadline. |
| EXPECT_GT(ellapsed_ms.count(), kServerlistDelayMs); |
| EXPECT_LT(ellapsed_ms.count(), kCallDeadlineMs); |
| |
| // Each backend should have gotten 1 request. |
| for (size_t i = 0; i < backends_.size(); ++i) { |
| EXPECT_EQ(1U, backend_servers_[i].service_->request_count()); |
| } |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent two responses. |
| EXPECT_EQ(2U, balancer_servers_[0].service_->response_count()); |
| |
| // Check LB policy name for the channel. |
| EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(SingleBalancerTest, Fallback) { |
| const int kFallbackTimeoutMs = 200 * grpc_test_slowdown_factor(); |
| const int kServerlistDelayMs = 500 * grpc_test_slowdown_factor(); |
| const size_t kNumBackendInResolution = backends_.size() / 2; |
| |
| ResetStub(kFallbackTimeoutMs); |
| std::vector<AddressData> addresses; |
| addresses.emplace_back(AddressData{balancer_servers_[0].port_, true, ""}); |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| addresses.emplace_back(AddressData{backend_servers_[i].port_, false, ""}); |
| } |
| SetNextResolution(addresses); |
| |
| // Send non-empty serverlist only after kServerlistDelayMs. |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends( |
| GetBackendPorts(kNumBackendInResolution /* start_index */), {}), |
| kServerlistDelayMs); |
| |
| // Wait until all the fallback backends are reachable. |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| WaitForBackend(i); |
| } |
| |
| // The first request. |
| gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
| CheckRpcSendOk(kNumBackendInResolution); |
| gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
| |
| // Fallback is used: each backend returned by the resolver should have |
| // gotten one request. |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| EXPECT_EQ(1U, backend_servers_[i].service_->request_count()); |
| } |
| for (size_t i = kNumBackendInResolution; i < backends_.size(); ++i) { |
| EXPECT_EQ(0U, backend_servers_[i].service_->request_count()); |
| } |
| |
| // Wait until the serverlist reception has been processed and all backends |
| // in the serverlist are reachable. |
| for (size_t i = kNumBackendInResolution; i < backends_.size(); ++i) { |
| WaitForBackend(i); |
| } |
| |
| // Send out the second request. |
| gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
| CheckRpcSendOk(backends_.size() - kNumBackendInResolution); |
| gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
| |
| // Serverlist is used: each backend returned by the balancer should |
| // have gotten one request. |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| EXPECT_EQ(0U, backend_servers_[i].service_->request_count()); |
| } |
| for (size_t i = kNumBackendInResolution; i < backends_.size(); ++i) { |
| EXPECT_EQ(1U, backend_servers_[i].service_->request_count()); |
| } |
| |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| } |
| |
| TEST_F(SingleBalancerTest, FallbackUpdate) { |
| const int kFallbackTimeoutMs = 200 * grpc_test_slowdown_factor(); |
| const int kServerlistDelayMs = 500 * grpc_test_slowdown_factor(); |
| const size_t kNumBackendInResolution = backends_.size() / 3; |
| const size_t kNumBackendInResolutionUpdate = backends_.size() / 3; |
| |
| ResetStub(kFallbackTimeoutMs); |
| std::vector<AddressData> addresses; |
| addresses.emplace_back(AddressData{balancer_servers_[0].port_, true, ""}); |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| addresses.emplace_back(AddressData{backend_servers_[i].port_, false, ""}); |
| } |
| SetNextResolution(addresses); |
| |
| // Send non-empty serverlist only after kServerlistDelayMs. |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends( |
| GetBackendPorts(kNumBackendInResolution + |
| kNumBackendInResolutionUpdate /* start_index */), |
| {}), |
| kServerlistDelayMs); |
| |
| // Wait until all the fallback backends are reachable. |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| WaitForBackend(i); |
| } |
| |
| // The first request. |
| gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
| CheckRpcSendOk(kNumBackendInResolution); |
| gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
| |
| // Fallback is used: each backend returned by the resolver should have |
| // gotten one request. |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| EXPECT_EQ(1U, backend_servers_[i].service_->request_count()); |
| } |
| for (size_t i = kNumBackendInResolution; i < backends_.size(); ++i) { |
| EXPECT_EQ(0U, backend_servers_[i].service_->request_count()); |
| } |
| |
| addresses.clear(); |
| addresses.emplace_back(AddressData{balancer_servers_[0].port_, true, ""}); |
| for (size_t i = kNumBackendInResolution; |
| i < kNumBackendInResolution + kNumBackendInResolutionUpdate; ++i) { |
| addresses.emplace_back(AddressData{backend_servers_[i].port_, false, ""}); |
| } |
| SetNextResolution(addresses); |
| |
| // Wait until the resolution update has been processed and all the new |
| // fallback backends are reachable. |
| for (size_t i = kNumBackendInResolution; |
| i < kNumBackendInResolution + kNumBackendInResolutionUpdate; ++i) { |
| WaitForBackend(i); |
| } |
| |
| // Send out the second request. |
| gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
| CheckRpcSendOk(kNumBackendInResolutionUpdate); |
| gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
| |
| // The resolution update is used: each backend in the resolution update should |
| // have gotten one request. |
| for (size_t i = 0; i < kNumBackendInResolution; ++i) { |
| EXPECT_EQ(0U, backend_servers_[i].service_->request_count()); |
| } |
| for (size_t i = kNumBackendInResolution; |
| i < kNumBackendInResolution + kNumBackendInResolutionUpdate; ++i) { |
| EXPECT_EQ(1U, backend_servers_[i].service_->request_count()); |
| } |
| for (size_t i = kNumBackendInResolution + kNumBackendInResolutionUpdate; |
| i < backends_.size(); ++i) { |
| EXPECT_EQ(0U, backend_servers_[i].service_->request_count()); |
| } |
| |
| // Wait until the serverlist reception has been processed and all backends |
| // in the serverlist are reachable. |
| for (size_t i = kNumBackendInResolution + kNumBackendInResolutionUpdate; |
| i < backends_.size(); ++i) { |
| WaitForBackend(i); |
| } |
| |
| // Send out the third request. |
| gpr_log(GPR_INFO, "========= BEFORE THIRD BATCH =========="); |
| CheckRpcSendOk(backends_.size() - kNumBackendInResolution - |
| kNumBackendInResolutionUpdate); |
| gpr_log(GPR_INFO, "========= DONE WITH THIRD BATCH =========="); |
| |
| // Serverlist is used: each backend returned by the balancer should |
| // have gotten one request. |
| for (size_t i = 0; |
| i < kNumBackendInResolution + kNumBackendInResolutionUpdate; ++i) { |
| EXPECT_EQ(0U, backend_servers_[i].service_->request_count()); |
| } |
| for (size_t i = kNumBackendInResolution + kNumBackendInResolutionUpdate; |
| i < backends_.size(); ++i) { |
| EXPECT_EQ(1U, backend_servers_[i].service_->request_count()); |
| } |
| |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| } |
| |
| TEST_F(SingleBalancerTest, BackendsRestart) { |
| const size_t kNumRpcsPerAddress = 100; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts(), {}), |
| 0); |
| // Make sure that trying to connect works without a call. |
| channel_->GetState(true /* try_to_connect */); |
| // Send kNumRpcsPerAddress RPCs per server. |
| CheckRpcSendOk(kNumRpcsPerAddress * num_backends_); |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| for (size_t i = 0; i < backends_.size(); ++i) { |
| if (backends_[i]->Shutdown()) backend_servers_[i].Shutdown(); |
| } |
| CheckRpcSendFailure(); |
| for (size_t i = 0; i < num_backends_; ++i) { |
| backends_.emplace_back(new BackendServiceImpl()); |
| backend_servers_.emplace_back(ServerThread<BackendService>( |
| "backend", server_host_, backends_.back().get())); |
| } |
| // The following RPC will fail due to the backend ports having changed. It |
| // will nonetheless exercise the grpclb-roundrobin handling of the RR policy |
| // having gone into shutdown. |
| // TODO(dgq): implement the "backend restart" component as well. We need extra |
| // machinery to either update the LB responses "on the fly" or instruct |
| // backends which ports to restart on. |
| CheckRpcSendFailure(); |
| // Check LB policy name for the channel. |
| EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
| } |
| |
| class UpdatesTest : public GrpclbEnd2endTest { |
| public: |
| UpdatesTest() : GrpclbEnd2endTest(4, 3, 0) {} |
| }; |
| |
| TEST_F(UpdatesTest, UpdateBalancers) { |
| const std::vector<int> first_backend{GetBackendPorts()[0]}; |
| const std::vector<int> second_backend{GetBackendPorts()[1]}; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(first_backend, {}), 0); |
| ScheduleResponseForBalancer( |
| 1, BalancerServiceImpl::BuildResponseForBackends(second_backend, {}), 0); |
| |
| // Start servers and send 10 RPCs per server. |
| gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
| CheckRpcSendOk(10); |
| gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
| |
| // All 10 requests should have gone to the first backend. |
| EXPECT_EQ(10U, backend_servers_[0].service_->request_count()); |
| |
| balancers_[0]->NotifyDoneWithServerlists(); |
| balancers_[1]->NotifyDoneWithServerlists(); |
| balancers_[2]->NotifyDoneWithServerlists(); |
| // Balancer 0 got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[1].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[1].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->response_count()); |
| |
| std::vector<AddressData> addresses; |
| addresses.emplace_back(AddressData{balancer_servers_[1].port_, true, ""}); |
| gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 =========="); |
| SetNextResolution(addresses); |
| gpr_log(GPR_INFO, "========= UPDATE 1 DONE =========="); |
| |
| // Wait until update has been processed, as signaled by the second backend |
| // receiving a request. |
| EXPECT_EQ(0U, backend_servers_[1].service_->request_count()); |
| WaitForBackend(1); |
| |
| backend_servers_[1].service_->ResetCounters(); |
| gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
| CheckRpcSendOk(10); |
| gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
| // All 10 requests should have gone to the second backend. |
| EXPECT_EQ(10U, backend_servers_[1].service_->request_count()); |
| |
| balancers_[0]->NotifyDoneWithServerlists(); |
| balancers_[1]->NotifyDoneWithServerlists(); |
| balancers_[2]->NotifyDoneWithServerlists(); |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| EXPECT_EQ(1U, balancer_servers_[1].service_->request_count()); |
| EXPECT_EQ(1U, balancer_servers_[1].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->response_count()); |
| // Check LB policy name for the channel. |
| EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
| } |
| |
| // Send an update with the same set of LBs as the one in SetUp() in order to |
| // verify that the LB channel inside grpclb keeps the initial connection (which |
| // by definition is also present in the update). |
| TEST_F(UpdatesTest, UpdateBalancersRepeated) { |
| const std::vector<int> first_backend{GetBackendPorts()[0]}; |
| const std::vector<int> second_backend{GetBackendPorts()[0]}; |
| |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(first_backend, {}), 0); |
| ScheduleResponseForBalancer( |
| 1, BalancerServiceImpl::BuildResponseForBackends(second_backend, {}), 0); |
| |
| // Start servers and send 10 RPCs per server. |
| gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
| CheckRpcSendOk(10); |
| gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
| |
| // All 10 requests should have gone to the first backend. |
| EXPECT_EQ(10U, backend_servers_[0].service_->request_count()); |
| |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // Balancer 0 got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[1].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[1].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->response_count()); |
| |
| std::vector<AddressData> addresses; |
| addresses.emplace_back(AddressData{balancer_servers_[0].port_, true, ""}); |
| addresses.emplace_back(AddressData{balancer_servers_[1].port_, true, ""}); |
| addresses.emplace_back(AddressData{balancer_servers_[2].port_, true, ""}); |
| gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 =========="); |
| SetNextResolution(addresses); |
| gpr_log(GPR_INFO, "========= UPDATE 1 DONE =========="); |
| |
| EXPECT_EQ(0U, backend_servers_[1].service_->request_count()); |
| gpr_timespec deadline = gpr_time_add( |
| gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(10000, GPR_TIMESPAN)); |
| // Send 10 seconds worth of RPCs |
| do { |
| CheckRpcSendOk(); |
| } while (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0); |
| // grpclb continued using the original LB call to the first balancer, which |
| // doesn't assign the second backend. |
| EXPECT_EQ(0U, backend_servers_[1].service_->request_count()); |
| balancers_[0]->NotifyDoneWithServerlists(); |
| |
| addresses.clear(); |
| addresses.emplace_back(AddressData{balancer_servers_[0].port_, true, ""}); |
| addresses.emplace_back(AddressData{balancer_servers_[1].port_, true, ""}); |
| gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 2 =========="); |
| SetNextResolution(addresses); |
| gpr_log(GPR_INFO, "========= UPDATE 2 DONE =========="); |
| |
| EXPECT_EQ(0U, backend_servers_[1].service_->request_count()); |
| deadline = gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), |
| gpr_time_from_millis(10000, GPR_TIMESPAN)); |
| // Send 10 seconds worth of RPCs |
| do { |
| CheckRpcSendOk(); |
| } while (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0); |
| // grpclb continued using the original LB call to the first balancer, which |
| // doesn't assign the second backend. |
| EXPECT_EQ(0U, backend_servers_[1].service_->request_count()); |
| balancers_[0]->NotifyDoneWithServerlists(); |
| |
| // Check LB policy name for the channel. |
| EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(UpdatesTest, UpdateBalancersDeadUpdate) { |
| const std::vector<int> first_backend{GetBackendPorts()[0]}; |
| const std::vector<int> second_backend{GetBackendPorts()[1]}; |
| |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(first_backend, {}), 0); |
| ScheduleResponseForBalancer( |
| 1, BalancerServiceImpl::BuildResponseForBackends(second_backend, {}), 0); |
| |
| // Start servers and send 10 RPCs per server. |
| gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
| CheckRpcSendOk(10); |
| gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
| // All 10 requests should have gone to the first backend. |
| EXPECT_EQ(10U, backend_servers_[0].service_->request_count()); |
| |
| // Kill balancer 0 |
| gpr_log(GPR_INFO, "********** ABOUT TO KILL BALANCER 0 *************"); |
| balancers_[0]->NotifyDoneWithServerlists(); |
| if (balancers_[0]->Shutdown()) balancer_servers_[0].Shutdown(); |
| gpr_log(GPR_INFO, "********** KILLED BALANCER 0 *************"); |
| |
| // This is serviced by the existing RR policy |
| gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
| CheckRpcSendOk(10); |
| gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
| // All 10 requests should again have gone to the first backend. |
| EXPECT_EQ(20U, backend_servers_[0].service_->request_count()); |
| EXPECT_EQ(0U, backend_servers_[1].service_->request_count()); |
| |
| balancers_[0]->NotifyDoneWithServerlists(); |
| balancers_[1]->NotifyDoneWithServerlists(); |
| balancers_[2]->NotifyDoneWithServerlists(); |
| // Balancer 0 got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[1].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[1].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->response_count()); |
| |
| std::vector<AddressData> addresses; |
| addresses.emplace_back(AddressData{balancer_servers_[1].port_, true, ""}); |
| gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 =========="); |
| SetNextResolution(addresses); |
| gpr_log(GPR_INFO, "========= UPDATE 1 DONE =========="); |
| |
| // Wait until update has been processed, as signaled by the second backend |
| // receiving a request. In the meantime, the client continues to be serviced |
| // (by the first backend) without interruption. |
| EXPECT_EQ(0U, backend_servers_[1].service_->request_count()); |
| WaitForBackend(1); |
| |
| // This is serviced by the existing RR policy |
| backend_servers_[1].service_->ResetCounters(); |
| gpr_log(GPR_INFO, "========= BEFORE THIRD BATCH =========="); |
| CheckRpcSendOk(10); |
| gpr_log(GPR_INFO, "========= DONE WITH THIRD BATCH =========="); |
| // All 10 requests should have gone to the second backend. |
| EXPECT_EQ(10U, backend_servers_[1].service_->request_count()); |
| |
| balancers_[0]->NotifyDoneWithServerlists(); |
| balancers_[1]->NotifyDoneWithServerlists(); |
| balancers_[2]->NotifyDoneWithServerlists(); |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| EXPECT_EQ(1U, balancer_servers_[1].service_->request_count()); |
| EXPECT_EQ(1U, balancer_servers_[1].service_->response_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->request_count()); |
| EXPECT_EQ(0U, balancer_servers_[2].service_->response_count()); |
| // Check LB policy name for the channel. |
| EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(SingleBalancerTest, Drop) { |
| const size_t kNumRpcsPerAddress = 100; |
| const int num_of_drop_by_rate_limiting_addresses = 1; |
| const int num_of_drop_by_load_balancing_addresses = 2; |
| const int num_of_drop_addresses = num_of_drop_by_rate_limiting_addresses + |
| num_of_drop_by_load_balancing_addresses; |
| const int num_total_addresses = num_backends_ + num_of_drop_addresses; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends( |
| GetBackendPorts(), |
| {{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
| {"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
| 0); |
| // Wait until all backends are ready. |
| WaitForAllBackends(); |
| // Send kNumRpcsPerAddress RPCs for each server and drop address. |
| size_t num_drops = 0; |
| for (size_t i = 0; i < kNumRpcsPerAddress * num_total_addresses; ++i) { |
| EchoResponse response; |
| const Status status = SendRpc(&response); |
| if (!status.ok() && |
| status.error_message() == "Call dropped by load balancing policy") { |
| ++num_drops; |
| } else { |
| EXPECT_TRUE(status.ok()) << "code=" << status.error_code() |
| << " message=" << status.error_message(); |
| EXPECT_EQ(response.message(), kRequestMessage_); |
| } |
| } |
| EXPECT_EQ(kNumRpcsPerAddress * num_of_drop_addresses, num_drops); |
| |
| // Each backend should have gotten 100 requests. |
| for (size_t i = 0; i < backends_.size(); ++i) { |
| EXPECT_EQ(kNumRpcsPerAddress, |
| backend_servers_[i].service_->request_count()); |
| } |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| } |
| |
| TEST_F(SingleBalancerTest, DropAllFirst) { |
| // All registered addresses are marked as "drop". |
| const int num_of_drop_by_rate_limiting_addresses = 1; |
| const int num_of_drop_by_load_balancing_addresses = 1; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends( |
| {}, {{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
| {"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
| 0); |
| const Status status = SendRpc(); |
| EXPECT_FALSE(status.ok()); |
| EXPECT_EQ(status.error_message(), "Call dropped by load balancing policy"); |
| } |
| |
| TEST_F(SingleBalancerTest, DropAll) { |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts(), {}), |
| 0); |
| const int num_of_drop_by_rate_limiting_addresses = 1; |
| const int num_of_drop_by_load_balancing_addresses = 1; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends( |
| {}, {{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
| {"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
| 1000); |
| |
| // First call succeeds. |
| CheckRpcSendOk(); |
| // But eventually, the update with only dropped servers is processed and calls |
| // fail. |
| Status status; |
| do { |
| status = SendRpc(); |
| } while (status.ok()); |
| EXPECT_FALSE(status.ok()); |
| EXPECT_EQ(status.error_message(), "Call dropped by load balancing policy"); |
| } |
| |
| class SingleBalancerWithClientLoadReportingTest : public GrpclbEnd2endTest { |
| public: |
| SingleBalancerWithClientLoadReportingTest() : GrpclbEnd2endTest(4, 1, 2) {} |
| }; |
| |
| TEST_F(SingleBalancerWithClientLoadReportingTest, Vanilla) { |
| const size_t kNumRpcsPerAddress = 100; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts(), {}), |
| 0); |
| // Wait until all backends are ready. |
| int num_ok = 0; |
| int num_failure = 0; |
| int num_drops = 0; |
| std::tie(num_ok, num_failure, num_drops) = WaitForAllBackends(); |
| // Send kNumRpcsPerAddress RPCs per server. |
| CheckRpcSendOk(kNumRpcsPerAddress * num_backends_); |
| // Each backend should have gotten 100 requests. |
| for (size_t i = 0; i < backends_.size(); ++i) { |
| EXPECT_EQ(kNumRpcsPerAddress, |
| backend_servers_[i].service_->request_count()); |
| } |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| |
| const ClientStats client_stats = WaitForLoadReports(); |
| EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + num_ok, |
| client_stats.num_calls_started); |
| EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + num_ok, |
| client_stats.num_calls_finished); |
| EXPECT_EQ(0U, client_stats.num_calls_finished_with_client_failed_to_send); |
| EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + (num_ok + num_drops), |
| client_stats.num_calls_finished_known_received); |
| EXPECT_THAT(client_stats.drop_token_counts, ::testing::ElementsAre()); |
| } |
| |
| TEST_F(SingleBalancerWithClientLoadReportingTest, Drop) { |
| const size_t kNumRpcsPerAddress = 3; |
| const int num_of_drop_by_rate_limiting_addresses = 2; |
| const int num_of_drop_by_load_balancing_addresses = 1; |
| const int num_of_drop_addresses = num_of_drop_by_rate_limiting_addresses + |
| num_of_drop_by_load_balancing_addresses; |
| const int num_total_addresses = num_backends_ + num_of_drop_addresses; |
| ScheduleResponseForBalancer( |
| 0, BalancerServiceImpl::BuildResponseForBackends( |
| GetBackendPorts(), |
| {{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
| {"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
| 0); |
| // Wait until all backends are ready. |
| int num_warmup_ok = 0; |
| int num_warmup_failure = 0; |
| int num_warmup_drops = 0; |
| std::tie(num_warmup_ok, num_warmup_failure, num_warmup_drops) = |
| WaitForAllBackends(num_total_addresses /* num_requests_multiple_of */); |
| const int num_total_warmup_requests = |
| num_warmup_ok + num_warmup_failure + num_warmup_drops; |
| size_t num_drops = 0; |
| for (size_t i = 0; i < kNumRpcsPerAddress * num_total_addresses; ++i) { |
| EchoResponse response; |
| const Status status = SendRpc(&response); |
| if (!status.ok() && |
| status.error_message() == "Call dropped by load balancing policy") { |
| ++num_drops; |
| } else { |
| EXPECT_TRUE(status.ok()) << "code=" << status.error_code() |
| << " message=" << status.error_message(); |
| EXPECT_EQ(response.message(), kRequestMessage_); |
| } |
| } |
| EXPECT_EQ(kNumRpcsPerAddress * num_of_drop_addresses, num_drops); |
| // Each backend should have gotten 100 requests. |
| for (size_t i = 0; i < backends_.size(); ++i) { |
| EXPECT_EQ(kNumRpcsPerAddress, |
| backend_servers_[i].service_->request_count()); |
| } |
| balancers_[0]->NotifyDoneWithServerlists(); |
| // The balancer got a single request. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->request_count()); |
| // and sent a single response. |
| EXPECT_EQ(1U, balancer_servers_[0].service_->response_count()); |
| |
| const ClientStats client_stats = WaitForLoadReports(); |
| EXPECT_EQ( |
| kNumRpcsPerAddress * num_total_addresses + num_total_warmup_requests, |
| client_stats.num_calls_started); |
| EXPECT_EQ( |
| kNumRpcsPerAddress * num_total_addresses + num_total_warmup_requests, |
| client_stats.num_calls_finished); |
| EXPECT_EQ(0U, client_stats.num_calls_finished_with_client_failed_to_send); |
| EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + num_warmup_ok, |
| client_stats.num_calls_finished_known_received); |
| // The number of warmup request is a multiple of the number of addresses. |
| // Therefore, all addresses in the scheduled balancer response are hit the |
| // same number of times. |
| const int num_times_drop_addresses_hit = |
| num_warmup_drops / num_of_drop_addresses; |
| EXPECT_THAT( |
| client_stats.drop_token_counts, |
| ::testing::ElementsAre( |
| ::testing::Pair("load_balancing", |
| (kNumRpcsPerAddress + num_times_drop_addresses_hit)), |
| ::testing::Pair( |
| "rate_limiting", |
| (kNumRpcsPerAddress + num_times_drop_addresses_hit) * 2))); |
| } |
| |
| } // namespace |
| } // namespace testing |
| } // namespace grpc |
| |
| int main(int argc, char** argv) { |
| grpc_init(); |
| grpc_test_init(argc, argv); |
| ::testing::InitGoogleTest(&argc, argv); |
| const auto result = RUN_ALL_TESTS(); |
| grpc_shutdown(); |
| return result; |
| } |