| /* |
| * |
| * Copyright 2016 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 <algorithm> |
| #include <memory> |
| #include <mutex> |
| #include <random> |
| #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/atm.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/thd.h> |
| #include <grpc/support/time.h> |
| |
| #include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h" |
| #include "src/core/ext/filters/client_channel/subchannel_index.h" |
| #include "src/core/lib/backoff/backoff.h" |
| #include "src/core/lib/gpr/env.h" |
| #include "src/core/lib/gprpp/debug_location.h" |
| #include "src/core/lib/gprpp/ref_counted_ptr.h" |
| |
| #include "src/proto/grpc/testing/echo.grpc.pb.h" |
| #include "test/core/util/port.h" |
| #include "test/core/util/test_config.h" |
| #include "test/cpp/end2end/test_service_impl.h" |
| |
| #include <gtest/gtest.h> |
| |
| using grpc::testing::EchoRequest; |
| using grpc::testing::EchoResponse; |
| using std::chrono::system_clock; |
| |
| // defined in tcp_client_posix.c |
| extern void (*grpc_tcp_client_connect_impl)( |
| grpc_closure* closure, grpc_endpoint** ep, |
| grpc_pollset_set* interested_parties, const grpc_channel_args* channel_args, |
| const grpc_resolved_address* addr, grpc_millis deadline); |
| |
| const auto original_tcp_connect_fn = grpc_tcp_client_connect_impl; |
| |
| namespace grpc { |
| namespace testing { |
| namespace { |
| |
| gpr_atm g_connection_delay_ms; |
| |
| void tcp_client_connect_with_delay(grpc_closure* closure, grpc_endpoint** ep, |
| grpc_pollset_set* interested_parties, |
| const grpc_channel_args* channel_args, |
| const grpc_resolved_address* addr, |
| grpc_millis deadline) { |
| const int delay_ms = gpr_atm_acq_load(&g_connection_delay_ms); |
| if (delay_ms > 0) { |
| gpr_sleep_until(grpc_timeout_milliseconds_to_deadline(delay_ms)); |
| } |
| original_tcp_connect_fn(closure, ep, interested_parties, channel_args, addr, |
| deadline + delay_ms); |
| } |
| |
| // Subclass of TestServiceImpl that increments a request counter for |
| // every call to the Echo RPC. |
| class MyTestServiceImpl : public TestServiceImpl { |
| public: |
| MyTestServiceImpl() : request_count_(0) {} |
| |
| Status Echo(ServerContext* context, const EchoRequest* request, |
| EchoResponse* response) override { |
| { |
| std::unique_lock<std::mutex> lock(mu_); |
| ++request_count_; |
| } |
| return TestServiceImpl::Echo(context, request, response); |
| } |
| |
| int request_count() { |
| std::unique_lock<std::mutex> lock(mu_); |
| return request_count_; |
| } |
| |
| void ResetCounters() { |
| std::unique_lock<std::mutex> lock(mu_); |
| request_count_ = 0; |
| } |
| |
| private: |
| std::mutex mu_; |
| int request_count_; |
| }; |
| |
| class ClientLbEnd2endTest : public ::testing::Test { |
| protected: |
| ClientLbEnd2endTest() |
| : server_host_("localhost"), kRequestMessage_("Live long and prosper.") { |
| // Make the backup poller poll very frequently in order to pick up |
| // updates from all the subchannels's FDs. |
| gpr_setenv("GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS", "1"); |
| } |
| |
| void SetUp() override { |
| response_generator_ = |
| grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>(); |
| } |
| |
| void TearDown() override { |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| servers_[i]->Shutdown(); |
| } |
| } |
| |
| void StartServers(size_t num_servers, |
| std::vector<int> ports = std::vector<int>()) { |
| for (size_t i = 0; i < num_servers; ++i) { |
| int port = 0; |
| if (ports.size() == num_servers) port = ports[i]; |
| servers_.emplace_back(new ServerData(server_host_, port)); |
| } |
| } |
| |
| void SetNextResolution(const std::vector<int>& ports) { |
| grpc_core::ExecCtx exec_ctx; |
| grpc_lb_addresses* addresses = |
| grpc_lb_addresses_create(ports.size(), nullptr); |
| for (size_t i = 0; i < ports.size(); ++i) { |
| char* lb_uri_str; |
| gpr_asprintf(&lb_uri_str, "ipv4:127.0.0.1:%d", ports[i]); |
| grpc_uri* lb_uri = grpc_uri_parse(lb_uri_str, true); |
| GPR_ASSERT(lb_uri != nullptr); |
| grpc_lb_addresses_set_address_from_uri(addresses, i, lb_uri, |
| false /* is balancer */, |
| "" /* balancer name */, 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}; |
| response_generator_->SetResponse(&fake_result); |
| grpc_lb_addresses_destroy(addresses); |
| } |
| |
| void SetNextResolutionUponError(const std::vector<int>& ports) { |
| grpc_core::ExecCtx exec_ctx; |
| grpc_lb_addresses* addresses = |
| grpc_lb_addresses_create(ports.size(), nullptr); |
| for (size_t i = 0; i < ports.size(); ++i) { |
| char* lb_uri_str; |
| gpr_asprintf(&lb_uri_str, "ipv4:127.0.0.1:%d", ports[i]); |
| grpc_uri* lb_uri = grpc_uri_parse(lb_uri_str, true); |
| GPR_ASSERT(lb_uri != nullptr); |
| grpc_lb_addresses_set_address_from_uri(addresses, i, lb_uri, |
| false /* is balancer */, |
| "" /* balancer name */, 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}; |
| response_generator_->SetReresolutionResponse(&fake_result); |
| grpc_lb_addresses_destroy(addresses); |
| } |
| |
| std::vector<int> GetServersPorts() { |
| std::vector<int> ports; |
| for (const auto& server : servers_) ports.push_back(server->port_); |
| return ports; |
| } |
| |
| std::unique_ptr<grpc::testing::EchoTestService::Stub> BuildStub( |
| const std::shared_ptr<Channel>& channel) { |
| return grpc::testing::EchoTestService::NewStub(channel); |
| } |
| |
| std::shared_ptr<Channel> BuildChannel( |
| const grpc::string& lb_policy_name, |
| ChannelArguments args = ChannelArguments()) { |
| if (lb_policy_name.size() > 0) { |
| args.SetLoadBalancingPolicyName(lb_policy_name); |
| } // else, default to pick first |
| args.SetPointer(GRPC_ARG_FAKE_RESOLVER_RESPONSE_GENERATOR, |
| response_generator_.get()); |
| return CreateCustomChannel("fake:///", InsecureChannelCredentials(), args); |
| } |
| |
| bool SendRpc( |
| const std::unique_ptr<grpc::testing::EchoTestService::Stub>& stub, |
| 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.ok(); |
| } |
| |
| void CheckRpcSendOk( |
| const std::unique_ptr<grpc::testing::EchoTestService::Stub>& stub, |
| const grpc_core::DebugLocation& location) { |
| EchoResponse response; |
| const bool success = SendRpc(stub, &response); |
| if (!success) abort(); |
| ASSERT_TRUE(success) << "From " << location.file() << ":" |
| << location.line(); |
| ASSERT_EQ(response.message(), kRequestMessage_) |
| << "From " << location.file() << ":" << location.line(); |
| } |
| |
| void CheckRpcSendFailure( |
| const std::unique_ptr<grpc::testing::EchoTestService::Stub>& stub) { |
| const bool success = SendRpc(stub); |
| EXPECT_FALSE(success); |
| } |
| |
| struct ServerData { |
| int port_; |
| std::unique_ptr<Server> server_; |
| MyTestServiceImpl service_; |
| std::unique_ptr<std::thread> thread_; |
| bool server_ready_ = false; |
| |
| explicit ServerData(const grpc::string& server_host, int port = 0) { |
| port_ = port > 0 ? port : grpc_pick_unused_port_or_die(); |
| gpr_log(GPR_INFO, "starting server on port %d", port_); |
| std::mutex mu; |
| std::unique_lock<std::mutex> lock(mu); |
| std::condition_variable cond; |
| thread_.reset(new std::thread( |
| std::bind(&ServerData::Start, this, server_host, &mu, &cond))); |
| cond.wait(lock, [this] { return server_ready_; }); |
| server_ready_ = false; |
| gpr_log(GPR_INFO, "server startup complete"); |
| } |
| |
| void Start(const grpc::string& server_host, std::mutex* mu, |
| std::condition_variable* cond) { |
| std::ostringstream server_address; |
| server_address << server_host << ":" << port_; |
| ServerBuilder builder; |
| builder.AddListeningPort(server_address.str(), |
| InsecureServerCredentials()); |
| builder.RegisterService(&service_); |
| server_ = builder.BuildAndStart(); |
| std::lock_guard<std::mutex> lock(*mu); |
| server_ready_ = true; |
| cond->notify_one(); |
| } |
| |
| void Shutdown(bool join = true) { |
| server_->Shutdown(grpc_timeout_milliseconds_to_deadline(0)); |
| if (join) thread_->join(); |
| } |
| }; |
| |
| void ResetCounters() { |
| for (const auto& server : servers_) server->service_.ResetCounters(); |
| } |
| |
| void WaitForServer( |
| const std::unique_ptr<grpc::testing::EchoTestService::Stub>& stub, |
| size_t server_idx, const grpc_core::DebugLocation& location) { |
| do { |
| CheckRpcSendOk(stub, location); |
| } while (servers_[server_idx]->service_.request_count() == 0); |
| ResetCounters(); |
| } |
| |
| bool SeenAllServers() { |
| for (const auto& server : servers_) { |
| if (server->service_.request_count() == 0) return false; |
| } |
| return true; |
| } |
| |
| // Updates \a connection_order by appending to it the index of the newly |
| // connected server. Must be called after every single RPC. |
| void UpdateConnectionOrder( |
| const std::vector<std::unique_ptr<ServerData>>& servers, |
| std::vector<int>* connection_order) { |
| for (size_t i = 0; i < servers.size(); ++i) { |
| if (servers[i]->service_.request_count() == 1) { |
| // Was the server index known? If not, update connection_order. |
| const auto it = |
| std::find(connection_order->begin(), connection_order->end(), i); |
| if (it == connection_order->end()) { |
| connection_order->push_back(i); |
| return; |
| } |
| } |
| } |
| } |
| |
| const grpc::string server_host_; |
| std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_; |
| std::vector<std::unique_ptr<ServerData>> servers_; |
| grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator> |
| response_generator_; |
| const grpc::string kRequestMessage_; |
| }; |
| |
| TEST_F(ClientLbEnd2endTest, PickFirst) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel(""); // test that pick first is the default. |
| auto stub = BuildStub(channel); |
| std::vector<int> ports; |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| ports.emplace_back(servers_[i]->port_); |
| } |
| SetNextResolution(ports); |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| } |
| // All requests should have gone to a single server. |
| bool found = false; |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| const int request_count = servers_[i]->service_.request_count(); |
| if (request_count == kNumServers) { |
| found = true; |
| } else { |
| EXPECT_EQ(0, request_count); |
| } |
| } |
| EXPECT_TRUE(found); |
| // Check LB policy name for the channel. |
| EXPECT_EQ("pick_first", channel->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, PickFirstBackOffInitialReconnect) { |
| ChannelArguments args; |
| constexpr int kInitialBackOffMs = 100; |
| args.SetInt(GRPC_ARG_INITIAL_RECONNECT_BACKOFF_MS, kInitialBackOffMs); |
| const std::vector<int> ports = {grpc_pick_unused_port_or_die()}; |
| const gpr_timespec t0 = gpr_now(GPR_CLOCK_MONOTONIC); |
| auto channel = BuildChannel("pick_first", args); |
| auto stub = BuildStub(channel); |
| SetNextResolution(ports); |
| // The channel won't become connected (there's no server). |
| ASSERT_FALSE(channel->WaitForConnected( |
| grpc_timeout_milliseconds_to_deadline(kInitialBackOffMs * 2))); |
| // Bring up a server on the chosen port. |
| StartServers(1, ports); |
| // Now it will. |
| ASSERT_TRUE(channel->WaitForConnected( |
| grpc_timeout_milliseconds_to_deadline(kInitialBackOffMs * 2))); |
| const gpr_timespec t1 = gpr_now(GPR_CLOCK_MONOTONIC); |
| const grpc_millis waited_ms = gpr_time_to_millis(gpr_time_sub(t1, t0)); |
| gpr_log(GPR_DEBUG, "Waited %ld milliseconds", waited_ms); |
| // We should have waited at least kInitialBackOffMs. We substract one to |
| // account for test and precision accuracy drift. |
| EXPECT_GE(waited_ms, kInitialBackOffMs - 1); |
| // But not much more. |
| EXPECT_GT( |
| gpr_time_cmp( |
| grpc_timeout_milliseconds_to_deadline(kInitialBackOffMs * 1.10), t1), |
| 0); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, PickFirstBackOffMinReconnect) { |
| ChannelArguments args; |
| constexpr int kMinReconnectBackOffMs = 1000; |
| args.SetInt(GRPC_ARG_MIN_RECONNECT_BACKOFF_MS, kMinReconnectBackOffMs); |
| const std::vector<int> ports = {grpc_pick_unused_port_or_die()}; |
| auto channel = BuildChannel("pick_first", args); |
| auto stub = BuildStub(channel); |
| SetNextResolution(ports); |
| // Make connection delay a 10% longer than it's willing to in order to make |
| // sure we are hitting the codepath that waits for the min reconnect backoff. |
| gpr_atm_rel_store(&g_connection_delay_ms, kMinReconnectBackOffMs * 1.10); |
| grpc_tcp_client_connect_impl = tcp_client_connect_with_delay; |
| const gpr_timespec t0 = gpr_now(GPR_CLOCK_MONOTONIC); |
| channel->WaitForConnected( |
| grpc_timeout_milliseconds_to_deadline(kMinReconnectBackOffMs * 2)); |
| const gpr_timespec t1 = gpr_now(GPR_CLOCK_MONOTONIC); |
| const grpc_millis waited_ms = gpr_time_to_millis(gpr_time_sub(t1, t0)); |
| gpr_log(GPR_DEBUG, "Waited %ld ms", waited_ms); |
| // We should have waited at least kMinReconnectBackOffMs. We substract one to |
| // account for test and precision accuracy drift. |
| EXPECT_GE(waited_ms, kMinReconnectBackOffMs - 1); |
| gpr_atm_rel_store(&g_connection_delay_ms, 0); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, PickFirstUpdates) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel("pick_first"); |
| auto stub = BuildStub(channel); |
| |
| std::vector<int> ports; |
| |
| // Perform one RPC against the first server. |
| ports.emplace_back(servers_[0]->port_); |
| SetNextResolution(ports); |
| gpr_log(GPR_INFO, "****** SET [0] *******"); |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| EXPECT_EQ(servers_[0]->service_.request_count(), 1); |
| |
| // An empty update will result in the channel going into TRANSIENT_FAILURE. |
| ports.clear(); |
| SetNextResolution(ports); |
| gpr_log(GPR_INFO, "****** SET none *******"); |
| grpc_connectivity_state channel_state; |
| do { |
| channel_state = channel->GetState(true /* try to connect */); |
| } while (channel_state == GRPC_CHANNEL_READY); |
| GPR_ASSERT(channel_state != GRPC_CHANNEL_READY); |
| servers_[0]->service_.ResetCounters(); |
| |
| // Next update introduces servers_[1], making the channel recover. |
| ports.clear(); |
| ports.emplace_back(servers_[1]->port_); |
| SetNextResolution(ports); |
| gpr_log(GPR_INFO, "****** SET [1] *******"); |
| WaitForServer(stub, 1, DEBUG_LOCATION); |
| EXPECT_EQ(servers_[0]->service_.request_count(), 0); |
| |
| // And again for servers_[2] |
| ports.clear(); |
| ports.emplace_back(servers_[2]->port_); |
| SetNextResolution(ports); |
| gpr_log(GPR_INFO, "****** SET [2] *******"); |
| WaitForServer(stub, 2, DEBUG_LOCATION); |
| EXPECT_EQ(servers_[0]->service_.request_count(), 0); |
| EXPECT_EQ(servers_[1]->service_.request_count(), 0); |
| |
| // Check LB policy name for the channel. |
| EXPECT_EQ("pick_first", channel->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, PickFirstUpdateSuperset) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel("pick_first"); |
| auto stub = BuildStub(channel); |
| |
| std::vector<int> ports; |
| |
| // Perform one RPC against the first server. |
| ports.emplace_back(servers_[0]->port_); |
| SetNextResolution(ports); |
| gpr_log(GPR_INFO, "****** SET [0] *******"); |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| EXPECT_EQ(servers_[0]->service_.request_count(), 1); |
| servers_[0]->service_.ResetCounters(); |
| |
| // Send and superset update |
| ports.clear(); |
| ports.emplace_back(servers_[1]->port_); |
| ports.emplace_back(servers_[0]->port_); |
| SetNextResolution(ports); |
| gpr_log(GPR_INFO, "****** SET superset *******"); |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| // We stick to the previously connected server. |
| WaitForServer(stub, 0, DEBUG_LOCATION); |
| EXPECT_EQ(0, servers_[1]->service_.request_count()); |
| |
| // Check LB policy name for the channel. |
| EXPECT_EQ("pick_first", channel->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, PickFirstManyUpdates) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel("pick_first"); |
| auto stub = BuildStub(channel); |
| std::vector<int> ports; |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| ports.emplace_back(servers_[i]->port_); |
| } |
| for (const bool force_creation : {true, false}) { |
| grpc_subchannel_index_test_only_set_force_creation(force_creation); |
| gpr_log(GPR_INFO, "Force subchannel creation: %d", force_creation); |
| for (size_t i = 0; i < 1000; ++i) { |
| std::shuffle(ports.begin(), ports.end(), |
| std::mt19937(std::random_device()())); |
| SetNextResolution(ports); |
| if (i % 10 == 0) CheckRpcSendOk(stub, DEBUG_LOCATION); |
| } |
| } |
| // Check LB policy name for the channel. |
| EXPECT_EQ("pick_first", channel->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, RoundRobin) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel("round_robin"); |
| auto stub = BuildStub(channel); |
| std::vector<int> ports; |
| for (const auto& server : servers_) { |
| ports.emplace_back(server->port_); |
| } |
| SetNextResolution(ports); |
| // Wait until all backends are ready. |
| do { |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| } while (!SeenAllServers()); |
| ResetCounters(); |
| // "Sync" to the end of the list. Next sequence of picks will start at the |
| // first server (index 0). |
| WaitForServer(stub, servers_.size() - 1, DEBUG_LOCATION); |
| std::vector<int> connection_order; |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| UpdateConnectionOrder(servers_, &connection_order); |
| } |
| // Backends should be iterated over in the order in which the addresses were |
| // given. |
| const auto expected = std::vector<int>{0, 1, 2}; |
| EXPECT_EQ(expected, connection_order); |
| // Check LB policy name for the channel. |
| EXPECT_EQ("round_robin", channel->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, RoundRobinUpdates) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel("round_robin"); |
| auto stub = BuildStub(channel); |
| std::vector<int> ports; |
| |
| // Start with a single server. |
| ports.emplace_back(servers_[0]->port_); |
| SetNextResolution(ports); |
| WaitForServer(stub, 0, DEBUG_LOCATION); |
| // Send RPCs. They should all go servers_[0] |
| for (size_t i = 0; i < 10; ++i) CheckRpcSendOk(stub, DEBUG_LOCATION); |
| EXPECT_EQ(10, servers_[0]->service_.request_count()); |
| EXPECT_EQ(0, servers_[1]->service_.request_count()); |
| EXPECT_EQ(0, servers_[2]->service_.request_count()); |
| servers_[0]->service_.ResetCounters(); |
| |
| // And now for the second server. |
| ports.clear(); |
| ports.emplace_back(servers_[1]->port_); |
| SetNextResolution(ports); |
| |
| // Wait until update has been processed, as signaled by the second backend |
| // receiving a request. |
| EXPECT_EQ(0, servers_[1]->service_.request_count()); |
| WaitForServer(stub, 1, DEBUG_LOCATION); |
| |
| for (size_t i = 0; i < 10; ++i) CheckRpcSendOk(stub, DEBUG_LOCATION); |
| EXPECT_EQ(0, servers_[0]->service_.request_count()); |
| EXPECT_EQ(10, servers_[1]->service_.request_count()); |
| EXPECT_EQ(0, servers_[2]->service_.request_count()); |
| servers_[1]->service_.ResetCounters(); |
| |
| // ... and for the last server. |
| ports.clear(); |
| ports.emplace_back(servers_[2]->port_); |
| SetNextResolution(ports); |
| WaitForServer(stub, 2, DEBUG_LOCATION); |
| |
| for (size_t i = 0; i < 10; ++i) CheckRpcSendOk(stub, DEBUG_LOCATION); |
| EXPECT_EQ(0, servers_[0]->service_.request_count()); |
| EXPECT_EQ(0, servers_[1]->service_.request_count()); |
| EXPECT_EQ(10, servers_[2]->service_.request_count()); |
| servers_[2]->service_.ResetCounters(); |
| |
| // Back to all servers. |
| ports.clear(); |
| ports.emplace_back(servers_[0]->port_); |
| ports.emplace_back(servers_[1]->port_); |
| ports.emplace_back(servers_[2]->port_); |
| SetNextResolution(ports); |
| WaitForServer(stub, 0, DEBUG_LOCATION); |
| WaitForServer(stub, 1, DEBUG_LOCATION); |
| WaitForServer(stub, 2, DEBUG_LOCATION); |
| |
| // Send three RPCs, one per server. |
| for (size_t i = 0; i < 3; ++i) CheckRpcSendOk(stub, DEBUG_LOCATION); |
| EXPECT_EQ(1, servers_[0]->service_.request_count()); |
| EXPECT_EQ(1, servers_[1]->service_.request_count()); |
| EXPECT_EQ(1, servers_[2]->service_.request_count()); |
| |
| // An empty update will result in the channel going into TRANSIENT_FAILURE. |
| ports.clear(); |
| SetNextResolution(ports); |
| grpc_connectivity_state channel_state; |
| do { |
| channel_state = channel->GetState(true /* try to connect */); |
| } while (channel_state == GRPC_CHANNEL_READY); |
| GPR_ASSERT(channel_state != GRPC_CHANNEL_READY); |
| servers_[0]->service_.ResetCounters(); |
| |
| // Next update introduces servers_[1], making the channel recover. |
| ports.clear(); |
| ports.emplace_back(servers_[1]->port_); |
| SetNextResolution(ports); |
| WaitForServer(stub, 1, DEBUG_LOCATION); |
| channel_state = channel->GetState(false /* try to connect */); |
| GPR_ASSERT(channel_state == GRPC_CHANNEL_READY); |
| |
| // Check LB policy name for the channel. |
| EXPECT_EQ("round_robin", channel->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, RoundRobinUpdateInError) { |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel("round_robin"); |
| auto stub = BuildStub(channel); |
| std::vector<int> ports; |
| |
| // Start with a single server. |
| ports.emplace_back(servers_[0]->port_); |
| SetNextResolution(ports); |
| WaitForServer(stub, 0, DEBUG_LOCATION); |
| // Send RPCs. They should all go to servers_[0] |
| for (size_t i = 0; i < 10; ++i) SendRpc(stub); |
| EXPECT_EQ(10, servers_[0]->service_.request_count()); |
| EXPECT_EQ(0, servers_[1]->service_.request_count()); |
| EXPECT_EQ(0, servers_[2]->service_.request_count()); |
| servers_[0]->service_.ResetCounters(); |
| |
| // Shutdown one of the servers to be sent in the update. |
| servers_[1]->Shutdown(false); |
| ports.emplace_back(servers_[1]->port_); |
| ports.emplace_back(servers_[2]->port_); |
| SetNextResolution(ports); |
| WaitForServer(stub, 0, DEBUG_LOCATION); |
| WaitForServer(stub, 2, DEBUG_LOCATION); |
| |
| // Send three RPCs, one per server. |
| for (size_t i = 0; i < kNumServers; ++i) SendRpc(stub); |
| // The server in shutdown shouldn't receive any. |
| EXPECT_EQ(0, servers_[1]->service_.request_count()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, RoundRobinManyUpdates) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| auto channel = BuildChannel("round_robin"); |
| auto stub = BuildStub(channel); |
| std::vector<int> ports; |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| ports.emplace_back(servers_[i]->port_); |
| } |
| for (size_t i = 0; i < 1000; ++i) { |
| std::shuffle(ports.begin(), ports.end(), |
| std::mt19937(std::random_device()())); |
| SetNextResolution(ports); |
| if (i % 10 == 0) CheckRpcSendOk(stub, DEBUG_LOCATION); |
| } |
| // Check LB policy name for the channel. |
| EXPECT_EQ("round_robin", channel->GetLoadBalancingPolicyName()); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, RoundRobinConcurrentUpdates) { |
| // TODO(dgq): replicate the way internal testing exercises the concurrent |
| // update provisions of RR. |
| } |
| |
| TEST_F(ClientLbEnd2endTest, RoundRobinReresolve) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 3; |
| std::vector<int> first_ports; |
| std::vector<int> second_ports; |
| for (int i = 0; i < kNumServers; ++i) { |
| first_ports.push_back(grpc_pick_unused_port_or_die()); |
| } |
| for (int i = 0; i < kNumServers; ++i) { |
| second_ports.push_back(grpc_pick_unused_port_or_die()); |
| } |
| StartServers(kNumServers, first_ports); |
| auto channel = BuildChannel("round_robin"); |
| auto stub = BuildStub(channel); |
| SetNextResolution(first_ports); |
| // Send a number of RPCs, which succeed. |
| for (size_t i = 0; i < 100; ++i) { |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| } |
| // Kill all servers |
| gpr_log(GPR_INFO, "****** ABOUT TO KILL SERVERS *******"); |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| servers_[i]->Shutdown(false); |
| } |
| gpr_log(GPR_INFO, "****** SERVERS KILLED *******"); |
| gpr_log(GPR_INFO, "****** SENDING DOOMED REQUESTS *******"); |
| // Client requests should fail. Send enough to tickle all subchannels. |
| for (size_t i = 0; i < servers_.size(); ++i) CheckRpcSendFailure(stub); |
| gpr_log(GPR_INFO, "****** DOOMED REQUESTS SENT *******"); |
| // Bring servers back up on a different set of ports. We need to do this to be |
| // sure that the eventual success is *not* due to subchannel reconnection |
| // attempts and that an actual re-resolution has happened as a result of the |
| // RR policy going into transient failure when all its subchannels become |
| // unavailable (in transient failure as well). |
| gpr_log(GPR_INFO, "****** RESTARTING SERVERS *******"); |
| StartServers(kNumServers, second_ports); |
| // Don't notify of the update. Wait for the LB policy's re-resolution to |
| // "pull" the new ports. |
| SetNextResolutionUponError(second_ports); |
| gpr_log(GPR_INFO, "****** SERVERS RESTARTED *******"); |
| gpr_log(GPR_INFO, "****** SENDING REQUEST TO SUCCEED *******"); |
| // Client request should eventually (but still fairly soon) succeed. |
| const gpr_timespec deadline = grpc_timeout_seconds_to_deadline(5); |
| gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC); |
| while (gpr_time_cmp(deadline, now) > 0) { |
| if (SendRpc(stub)) break; |
| now = gpr_now(GPR_CLOCK_MONOTONIC); |
| } |
| GPR_ASSERT(gpr_time_cmp(deadline, now) > 0); |
| } |
| |
| TEST_F(ClientLbEnd2endTest, RoundRobinSingleReconnect) { |
| const int kNumServers = 3; |
| StartServers(kNumServers); |
| const auto ports = GetServersPorts(); |
| auto channel = BuildChannel("round_robin"); |
| auto stub = BuildStub(channel); |
| SetNextResolution(ports); |
| for (size_t i = 0; i < kNumServers; ++i) |
| WaitForServer(stub, i, DEBUG_LOCATION); |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| EXPECT_EQ(1, servers_[i]->service_.request_count()) << "for backend #" << i; |
| } |
| // One request should have gone to each server. |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| EXPECT_EQ(1, servers_[i]->service_.request_count()); |
| } |
| const auto pre_death = servers_[0]->service_.request_count(); |
| // Kill the first server. |
| servers_[0]->Shutdown(true); |
| // Client request still succeed. May need retrying if RR had returned a pick |
| // before noticing the change in the server's connectivity. |
| while (!SendRpc(stub)) { |
| ; // Retry until success. |
| } |
| gpr_log(GPR_INFO, "------------------------------------------------------"); |
| // Send a bunch of RPCs that should succeed. |
| for (int i = 0; i < 10 * kNumServers; ++i) { |
| CheckRpcSendOk(stub, DEBUG_LOCATION); |
| } |
| const auto post_death = servers_[0]->service_.request_count(); |
| // No requests have gone to the deceased server. |
| EXPECT_EQ(pre_death, post_death); |
| // Bring the first server back up. |
| servers_[0].reset(new ServerData(server_host_, ports[0])); |
| // Requests should start arriving at the first server either right away (if |
| // the server managed to start before the RR policy retried the subchannel) or |
| // after the subchannel retry delay otherwise (RR's subchannel retried before |
| // the server was fully back up). |
| WaitForServer(stub, 0, DEBUG_LOCATION); |
| } |
| |
| } // namespace |
| } // namespace testing |
| } // namespace grpc |
| |
| int main(int argc, char** argv) { |
| ::testing::InitGoogleTest(&argc, argv); |
| grpc_test_init(argc, argv); |
| grpc_init(); |
| const auto result = RUN_ALL_TESTS(); |
| grpc_shutdown(); |
| return result; |
| } |