Add client channel stress test

2 files changed, 380 insertions, 0 deletions

diff --git a/test/cpp/client/BUILD b/test/cpp/client/BUILD
new file mode 100644
index 0000000000..12825e88c2
--- /dev/null
+++ b/test/cpp/client/BUILD
@@ -0,0 +1,51 @@
+# 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.
+
+licenses(["notice"])  # Apache v2
+
+load("//bazel:grpc_build_system.bzl", "grpc_cc_library", "grpc_cc_test", "grpc_package")
+
+grpc_package(name = "test/cpp/client")
+
+grpc_cc_test(
+    name = "credentials_test",
+    srcs = ["credentials_test.cc"],
+    external_deps = [
+        "gtest",
+    ],
+    deps = [
+        "//:gpr",
+        "//:grpc",
+        "//:grpc++",
+    ],
+)
+
+grpc_cc_test(
+    name = "client_channel_stress_test",
+    srcs = ["client_channel_stress_test.cc"],
+    deps = [
+        "//:gpr",
+        "//:grpc",
+        "//:grpc++",
+        "//:grpc_resolver_fake",
+        "//src/proto/grpc/lb/v1:load_balancer_proto",
+        "//src/proto/grpc/testing:echo_messages_proto",
+        "//src/proto/grpc/testing:echo_proto",
+        "//src/proto/grpc/testing/duplicate:echo_duplicate_proto",
+        "//test/core/util:gpr_test_util",
+        "//test/core/util:grpc_test_util",
+        "//test/cpp/end2end:test_service_impl",
+        "//test/cpp/util:test_util",
+    ],
+)
diff --git a/test/cpp/client/client_channel_stress_test.cc b/test/cpp/client/client_channel_stress_test.cc
new file mode 100644
index 0000000000..8940f6ff9e
--- /dev/null
+++ b/test/cpp/client/client_channel_stress_test.cc
@@ -0,0 +1,329 @@
+/*
+ *
+ * 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 <atomic>
+#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"
+
+using grpc::lb::v1::LoadBalanceRequest;
+using grpc::lb::v1::LoadBalanceResponse;
+using grpc::lb::v1::LoadBalancer;
+
+namespace grpc {
+namespace testing {
+namespace {
+
+const size_t kNumBackends = 10;
+const size_t kNumBalancers = 5;
+const size_t kNumClientThreads = 100;
+const int kResolutionUpdateIntervalMs = 50;
+const int kServerlistUpdateIntervalMs = 10;
+const int kTestDurationSec = 30;
+
+using BackendServiceImpl = TestServiceImpl;
+
+class BalancerServiceImpl : public LoadBalancer::Service {
+ public:
+  using Stream = ServerReaderWriter<LoadBalanceResponse, LoadBalanceRequest>;
+
+  explicit BalancerServiceImpl(const std::vector<int>& all_backend_ports)
+      : all_backend_ports_(all_backend_ports) {}
+
+  Status BalanceLoad(ServerContext* context, Stream* stream) override {
+    gpr_log(GPR_INFO, "LB[%p]: Start BalanceLoad.", this);
+    LoadBalanceRequest request;
+    stream->Read(&request);
+    while (!shutdown_) {
+      stream->Write(BuildRandomResponseForBackends());
+      std::this_thread::sleep_for(
+          std::chrono::milliseconds(kServerlistUpdateIntervalMs));
+    }
+    gpr_log(GPR_INFO, "LB[%p]: Finish BalanceLoad.", this);
+    return Status::OK;
+  }
+
+  void Shutdown() { shutdown_ = true; }
+
+ private:
+  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));
+  }
+
+  LoadBalanceResponse BuildRandomResponseForBackends() {
+    // Generate a random serverlist with varying size (if N =
+    // all_backend_ports_.size(), num_non_drop_entry is in [0, 2N],
+    // num_drop_entry is in [0, N]), order, duplicate, and drop rate.
+    size_t num_non_drop_entry =
+        std::rand() % (all_backend_ports_.size() * 2 + 1);
+    size_t num_drop_entry = std::rand() % (all_backend_ports_.size() + 1);
+    std::vector<int> random_backend_indices;
+    for (size_t i = 0; i < num_non_drop_entry; ++i) {
+      random_backend_indices.push_back(std::rand() % all_backend_ports_.size());
+    }
+    for (size_t i = 0; i < num_drop_entry; ++i) {
+      random_backend_indices.push_back(-1);
+    }
+    std::random_shuffle(random_backend_indices.begin(),
+                        random_backend_indices.end());
+    // Build the response according to the random list generated above.
+    LoadBalanceResponse response;
+    for (int index : random_backend_indices) {
+      auto* server = response.mutable_server_list()->add_servers();
+      if (index < 0) {
+        server->set_drop(true);
+        server->set_load_balance_token("load_balancing");
+      } else {
+        server->set_ip_address(Ip4ToPackedString("127.0.0.1"));
+        server->set_port(all_backend_ports_[index]);
+      }
+    }
+    return response;
+  }
+
+  std::atomic_bool shutdown_{false};
+  const std::vector<int> all_backend_ports_;
+};
+
+class ClientChannelStressTest {
+ public:
+  void Run() {
+    Start();
+    // Keep updating resolution for the test duration.
+    gpr_log(GPR_INFO, "Start updating resolution.");
+    const auto wait_duration =
+        std::chrono::milliseconds(kResolutionUpdateIntervalMs);
+    std::vector<AddressData> addresses;
+    auto start_time = std::chrono::steady_clock::now();
+    while (true) {
+      if (std::chrono::duration_cast<std::chrono::seconds>(
+              std::chrono::steady_clock::now() - start_time)
+              .count() > kTestDurationSec) {
+        break;
+      }
+      // Generate a random subset of balancers.
+      addresses.clear();
+      for (const auto& balancer_server : balancer_servers_) {
+        // Select each address with probability of 0.8.
+        if (std::rand() % 10 < 8) {
+          addresses.emplace_back(AddressData{balancer_server.port_, true, ""});
+        }
+      }
+      std::random_shuffle(addresses.begin(), addresses.end());
+      SetNextResolution(addresses);
+      std::this_thread::sleep_for(wait_duration);
+    }
+    gpr_log(GPR_INFO, "Finish updating resolution.");
+    Shutdown();
+  }
+
+ private:
+  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_;
+  };
+
+  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);
+  }
+
+  void KeepSendingRequests() {
+    gpr_log(GPR_INFO, "Start sending requests.");
+    while (!shutdown_) {
+      ClientContext context;
+      context.set_deadline(grpc_timeout_milliseconds_to_deadline(1000));
+      EchoRequest request;
+      request.set_message("test");
+      EchoResponse response;
+      {
+        std::lock_guard<std::mutex> lock(stub_mutex_);
+        stub_->Echo(&context, request, &response);
+      }
+    }
+    gpr_log(GPR_INFO, "Finish sending requests.");
+  }
+
+  void CreateStub() {
+    ChannelArguments args;
+    response_generator_ = grpc_fake_resolver_response_generator_create();
+    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 Start() {
+    // Start the backends.
+    std::vector<int> backend_ports;
+    for (size_t i = 0; i < kNumBackends; ++i) {
+      backends_.emplace_back(new BackendServiceImpl());
+      backend_servers_.emplace_back(ServerThread<BackendServiceImpl>(
+          "backend", server_host_, backends_.back().get()));
+      backend_ports.push_back(backend_servers_.back().port_);
+    }
+    // Start the load balancers.
+    for (size_t i = 0; i < kNumBalancers; ++i) {
+      balancers_.emplace_back(new BalancerServiceImpl(backend_ports));
+      balancer_servers_.emplace_back(ServerThread<BalancerServiceImpl>(
+          "balancer", server_host_, balancers_.back().get()));
+    }
+    // Start sending RPCs in multiple threads.
+    CreateStub();
+    for (size_t i = 0; i < kNumClientThreads; ++i) {
+      client_threads_.emplace_back(
+          std::thread(&ClientChannelStressTest::KeepSendingRequests, this));
+    }
+  }
+
+  void Shutdown() {
+    shutdown_ = true;
+    for (size_t i = 0; i < client_threads_.size(); ++i) {
+      client_threads_[i].join();
+    }
+    for (size_t i = 0; i < balancers_.size(); ++i) {
+      balancers_[i]->Shutdown();
+      balancer_servers_[i].Shutdown();
+    }
+    for (size_t i = 0; i < backends_.size(); ++i) {
+      backend_servers_[i].Shutdown();
+    }
+    grpc_fake_resolver_response_generator_unref(response_generator_);
+  }
+
+  std::atomic_bool shutdown_{false};
+  const grpc::string server_host_ = "localhost";
+  std::shared_ptr<Channel> channel_;
+  std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
+  std::mutex stub_mutex_;
+  std::vector<std::unique_ptr<BackendServiceImpl>> backends_;
+  std::vector<std::unique_ptr<BalancerServiceImpl>> balancers_;
+  std::vector<ServerThread<BackendServiceImpl>> backend_servers_;
+  std::vector<ServerThread<BalancerServiceImpl>> balancer_servers_;
+  grpc_fake_resolver_response_generator* response_generator_;
+  std::vector<std::thread> client_threads_;
+};
+
+}  // namespace
+}  // namespace testing
+}  // namespace grpc
+
+int main(int argc, char** argv) {
+  grpc_init();
+  grpc_test_init(argc, argv);
+  grpc::testing::ClientChannelStressTest test;
+  test.Run();
+  grpc_shutdown();
+  return 0;
+}