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//
//
// 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 <random>
#include <sstream>
#include <string>
#include <thread>
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/time.h>
#include <grpcpp/channel.h>
#include <grpcpp/client_context.h>
#include <grpcpp/create_channel.h>
#include <grpcpp/impl/sync.h>
#include <grpcpp/server.h>
#include <grpcpp/server_builder.h>
#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_balancer_addresses.h"
#include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h"
#include "src/core/lib/address_utils/parse_address.h"
#include "src/core/lib/gprpp/crash.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
7 years ago
#include "src/core/lib/gprpp/thd.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/iomgr/sockaddr.h"
#include "src/core/lib/resolver/server_address.h"
#include "src/core/lib/service_config/service_config_impl.h"
#include "src/proto/grpc/lb/v1/load_balancer.grpc.pb.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"
using grpc::lb::v1::LoadBalancer;
using grpc::lb::v1::LoadBalanceRequest;
using grpc::lb::v1::LoadBalanceResponse;
namespace grpc {
namespace testing {
namespace {
const size_t kNumBackends = 10;
const size_t kNumBalancers = 5;
const size_t kNumClientThreads = 10;
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:
std::string Ip4ToPackedString(const char* ip_str) {
struct in_addr ip4;
GPR_ASSERT(inet_pton(AF_INET, ip_str, &ip4) == 1);
return std::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::shuffle(random_backend_indices.begin(), random_backend_indices.end(),
std::mt19937(std::random_device()()));
// 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_, ""});
}
}
std::shuffle(addresses.begin(), addresses.end(),
std::mt19937(std::random_device()()));
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 std::string& type,
const std::string& server_host, T* service)
: type_(type), service_(service) {
grpc::internal::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.
grpc::internal::MutexLock lock(&mu);
port_ = grpc_pick_unused_port_or_die();
gpr_log(GPR_INFO, "starting %s server on port %d", type_.c_str(), port_);
grpc::internal::CondVar cond;
thread_ = std::make_unique<std::thread>(
std::bind(&ServerThread::Start, this, server_host, &mu, &cond));
cond.Wait(&mu);
gpr_log(GPR_INFO, "%s server startup complete", type_.c_str());
}
void Start(const std::string& server_host, grpc::internal::Mutex* mu,
grpc::internal::CondVar* cond) {
// We need to acquire the lock here in order to prevent the notify_one
// below from firing before its corresponding wait is executed.
grpc::internal::MutexLock 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->Signal();
}
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_;
std::string type_;
std::unique_ptr<Server> server_;
T* service_;
std::unique_ptr<std::thread> thread_;
};
struct AddressData {
int port;
std::string balancer_name;
};
static grpc_core::ServerAddressList CreateAddressListFromAddressDataList(
const std::vector<AddressData>& address_data) {
grpc_core::ServerAddressList addresses;
for (const auto& addr : address_data) {
std::string lb_uri_str = absl::StrCat("ipv4:127.0.0.1:", addr.port);
absl::StatusOr<grpc_core::URI> lb_uri = grpc_core::URI::Parse(lb_uri_str);
GPR_ASSERT(lb_uri.ok());
grpc_resolved_address address;
GPR_ASSERT(grpc_parse_uri(*lb_uri, &address));
addresses.emplace_back(
address, grpc_core::ChannelArgs().Set(GRPC_ARG_DEFAULT_AUTHORITY,
addr.balancer_name));
}
return addresses;
}
static grpc_core::Resolver::Result MakeResolverResult(
const std::vector<AddressData>& balancer_address_data) {
grpc_core::Resolver::Result result;
result.service_config = grpc_core::ServiceConfigImpl::Create(
grpc_core::ChannelArgs(),
"{\"loadBalancingConfig\":[{\"grpclb\":{}}]}");
GPR_ASSERT(result.service_config.ok());
grpc_core::ServerAddressList balancer_addresses =
CreateAddressListFromAddressDataList(balancer_address_data);
result.args = grpc_core::SetGrpcLbBalancerAddresses(
grpc_core::ChannelArgs(), std::move(balancer_addresses));
return result;
}
void SetNextResolution(const std::vector<AddressData>& address_data) {
grpc_core::ExecCtx exec_ctx;
grpc_core::Resolver::Result result = MakeResolverResult(address_data);
response_generator_->SetResponse(std::move(result));
}
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_);
Status status = stub_->Echo(&context, request, &response);
}
}
gpr_log(GPR_INFO, "Finish sending requests.");
}
void CreateStub() {
ChannelArguments args;
response_generator_ =
grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>();
args.SetPointer(GRPC_ARG_FAKE_RESOLVER_RESPONSE_GENERATOR,
response_generator_.get());
std::ostringstream uri;
uri << "fake:///servername_not_used";
channel_ = grpc::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();
}
}
std::atomic_bool shutdown_{false};
const std::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_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator>
response_generator_;
std::vector<std::thread> client_threads_;
};
} // namespace
} // namespace testing
} // namespace grpc
int main(int argc, char** argv) {
grpc::testing::TestEnvironment env(&argc, argv);
grpc::testing::ClientChannelStressTest test;
grpc_init();
test.Run();
grpc_shutdown();
return 0;
}