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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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276 lines
7.9 KiB
276 lines
7.9 KiB
6 years ago
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/*
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*
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* Copyright 2019 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include "src/core/lib/iomgr/port.h"
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#include <algorithm>
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#include <memory>
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#include <mutex>
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#include <random>
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#include <thread>
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#include <grpc/grpc.h>
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#include <grpc/support/alloc.h>
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#include <grpc/support/atm.h>
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#include <grpc/support/log.h>
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#include <grpc/support/string_util.h>
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#include <grpc/support/time.h>
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#include <grpcpp/channel.h>
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#include <grpcpp/client_context.h>
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#include <grpcpp/create_channel.h>
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#include <grpcpp/health_check_service_interface.h>
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#include <grpcpp/server.h>
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#include <grpcpp/server_builder.h>
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#include <gtest/gtest.h>
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#include "src/core/lib/backoff/backoff.h"
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#include "src/core/lib/gpr/env.h"
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#include "src/proto/grpc/testing/echo.grpc.pb.h"
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#include "test/core/util/port.h"
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#include "test/core/util/test_config.h"
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#include "test/cpp/end2end/test_service_impl.h"
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#ifdef GRPC_CFSTREAM
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using grpc::testing::EchoRequest;
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using grpc::testing::EchoResponse;
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using std::chrono::system_clock;
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namespace grpc {
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namespace testing {
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namespace {
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class CFStreamTest : public ::testing::Test {
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protected:
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CFStreamTest()
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: server_host_("grpctest"),
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interface_("lo0"),
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ipv4_address_("10.0.0.1"),
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netmask_("/32"),
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kRequestMessage_("🖖") {}
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void DNSUp() {
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std::ostringstream cmd;
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// Add DNS entry for server_host_ in /etc/hosts
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cmd << "echo '" << ipv4_address_ << " " << server_host_
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<< " ' | sudo tee -a /etc/hosts";
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std::system(cmd.str().c_str());
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}
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void DNSDown() {
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std::ostringstream cmd;
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// Remove DNS entry for server_host_ in /etc/hosts
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cmd << "sudo sed -i '.bak' '/" << server_host_ << "/d' /etc/hosts";
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std::system(cmd.str().c_str());
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}
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void InterfaceUp() {
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std::ostringstream cmd;
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cmd << "sudo /sbin/ifconfig " << interface_ << " alias " << ipv4_address_;
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std::system(cmd.str().c_str());
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}
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void InterfaceDown() {
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std::ostringstream cmd;
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cmd << "sudo /sbin/ifconfig " << interface_ << " -alias " << ipv4_address_;
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std::system(cmd.str().c_str());
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}
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void NetworkUp() {
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InterfaceUp();
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DNSUp();
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}
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void NetworkDown() {
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InterfaceDown();
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DNSDown();
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}
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void SetUp() override {
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NetworkUp();
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grpc_init();
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StartServer();
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}
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void TearDown() override {
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NetworkDown();
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StopServer();
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grpc_shutdown();
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}
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void StartServer() {
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port_ = grpc_pick_unused_port_or_die();
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server_.reset(new ServerData(port_));
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server_->Start(server_host_);
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}
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void StopServer() { server_->Shutdown(); }
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std::unique_ptr<grpc::testing::EchoTestService::Stub> BuildStub(
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const std::shared_ptr<Channel>& channel) {
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return grpc::testing::EchoTestService::NewStub(channel);
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}
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std::shared_ptr<Channel> BuildChannel() {
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std::ostringstream server_address;
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server_address << server_host_ << ":" << port_;
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return CreateCustomChannel(
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server_address.str(), InsecureChannelCredentials(), ChannelArguments());
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}
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void SendRpc(
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const std::unique_ptr<grpc::testing::EchoTestService::Stub>& stub,
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bool expect_success = false) {
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auto response = std::unique_ptr<EchoResponse>(new EchoResponse());
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EchoRequest request;
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request.set_message(kRequestMessage_);
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ClientContext context;
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Status status = stub->Echo(&context, request, response.get());
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if (status.ok()) {
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gpr_log(GPR_DEBUG, "RPC returned %s\n", response->message().c_str());
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} else {
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gpr_log(GPR_DEBUG, "RPC failed: %s", status.error_message().c_str());
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}
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if (expect_success) {
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EXPECT_TRUE(status.ok());
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}
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}
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bool WaitForChannelNotReady(Channel* channel, int timeout_seconds = 5) {
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const gpr_timespec deadline =
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grpc_timeout_seconds_to_deadline(timeout_seconds);
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grpc_connectivity_state state;
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while ((state = channel->GetState(false /* try_to_connect */)) ==
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GRPC_CHANNEL_READY) {
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if (!channel->WaitForStateChange(state, deadline)) return false;
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}
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return true;
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}
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bool WaitForChannelReady(Channel* channel, int timeout_seconds = 10) {
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const gpr_timespec deadline =
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grpc_timeout_seconds_to_deadline(timeout_seconds);
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grpc_connectivity_state state;
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while ((state = channel->GetState(true /* try_to_connect */)) !=
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GRPC_CHANNEL_READY) {
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if (!channel->WaitForStateChange(state, deadline)) return false;
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}
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return true;
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}
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private:
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struct ServerData {
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int port_;
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std::unique_ptr<Server> server_;
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TestServiceImpl service_;
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std::unique_ptr<std::thread> thread_;
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bool server_ready_ = false;
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explicit ServerData(int port) { port_ = port; }
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void Start(const grpc::string& server_host) {
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gpr_log(GPR_INFO, "starting server on port %d", port_);
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std::mutex mu;
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std::unique_lock<std::mutex> lock(mu);
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std::condition_variable cond;
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thread_.reset(new std::thread(
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std::bind(&ServerData::Serve, this, server_host, &mu, &cond)));
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cond.wait(lock, [this] { return server_ready_; });
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server_ready_ = false;
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gpr_log(GPR_INFO, "server startup complete");
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}
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void Serve(const grpc::string& server_host, std::mutex* mu,
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std::condition_variable* cond) {
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std::ostringstream server_address;
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server_address << server_host << ":" << port_;
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ServerBuilder builder;
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builder.AddListeningPort(server_address.str(),
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InsecureServerCredentials());
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builder.RegisterService(&service_);
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server_ = builder.BuildAndStart();
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std::lock_guard<std::mutex> lock(*mu);
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server_ready_ = true;
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cond->notify_one();
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}
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void Shutdown(bool join = true) {
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server_->Shutdown(grpc_timeout_milliseconds_to_deadline(0));
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if (join) thread_->join();
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}
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};
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const grpc::string server_host_;
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const grpc::string interface_;
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const grpc::string ipv4_address_;
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const grpc::string netmask_;
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std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
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std::unique_ptr<ServerData> server_;
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int port_;
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const grpc::string kRequestMessage_;
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};
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// gRPC should automatically detech network flaps (without enabling keepalives)
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// when CFStream is enabled
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TEST_F(CFStreamTest, NetworkTransition) {
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auto channel = BuildChannel();
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auto stub = BuildStub(channel);
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// Channel should be in READY state after we send an RPC
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SendRpc(stub, /*expect_success=*/true);
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EXPECT_EQ(channel->GetState(false), GRPC_CHANNEL_READY);
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std::atomic_bool shutdown{false};
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std::thread sender = std::thread([this, &stub, &shutdown]() {
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while (true) {
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if (shutdown.load()) {
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return;
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}
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SendRpc(stub);
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std::this_thread::sleep_for(std::chrono::milliseconds(1000));
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}
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});
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// bring down network
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NetworkDown();
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// network going down should be detected by cfstream
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EXPECT_TRUE(WaitForChannelNotReady(channel.get()));
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// bring network interface back up
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std::this_thread::sleep_for(std::chrono::milliseconds(1000));
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NetworkUp();
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// channel should reconnect
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EXPECT_TRUE(WaitForChannelReady(channel.get()));
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EXPECT_EQ(channel->GetState(false), GRPC_CHANNEL_READY);
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shutdown.store(true);
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sender.join();
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}
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} // namespace
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} // namespace testing
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} // namespace grpc
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#endif // GRPC_CFSTREAM
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int main(int argc, char** argv) {
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::testing::InitGoogleTest(&argc, argv);
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grpc_test_init(argc, argv);
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gpr_setenv("grpc_cfstream", "1");
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const auto result = RUN_ALL_TESTS();
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return result;
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}
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