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// Copyright 2022 The 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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#include <grpc/support/port_platform.h>
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#ifndef GRPC_ENABLE_FORK_SUPPORT
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// No-op for builds without fork support.
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int main(int /* argc */, char** /* argv */) { return 0; }
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#else // GRPC_ENABLE_FORK_SUPPORT
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#include <signal.h>
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#include <gtest/gtest.h>
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#include "absl/log/log.h"
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#include "absl/strings/str_cat.h"
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#include <grpc/fork.h>
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#include <grpc/grpc.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/server.h>
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#include <grpcpp/server_builder.h>
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#include <grpcpp/server_context.h>
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#include "src/core/lib/gprpp/fork.h"
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#include "src/proto/grpc/testing/echo.grpc.pb.h"
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#include "test/core/test_util/port.h"
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#include "test/core/test_util/test_config.h"
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#include "test/cpp/util/test_config.h"
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namespace grpc {
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namespace testing {
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namespace {
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class ServiceImpl final : public EchoTestService::Service {
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Status BidiStream(
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ServerContext* /*context*/,
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ServerReaderWriter<EchoResponse, EchoRequest>* stream) override {
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EchoRequest request;
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EchoResponse response;
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while (stream->Read(&request)) {
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LOG(INFO) << "recv msg " << request.message();
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response.set_message(request.message());
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stream->Write(response);
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LOG(INFO) << "wrote msg " << response.message();
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}
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return Status::OK;
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}
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};
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std::unique_ptr<EchoTestService::Stub> MakeStub(const std::string& addr) {
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return EchoTestService::NewStub(
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grpc::CreateChannel(addr, InsecureChannelCredentials()));
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}
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TEST(ClientForkTest, ClientCallsBeforeAndAfterForkSucceed) {
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grpc_core::Fork::Enable(true);
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int port = grpc_pick_unused_port_or_die();
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std::string addr = absl::StrCat("localhost:", port);
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pid_t server_pid = fork();
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switch (server_pid) {
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case -1: // fork failed
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GTEST_FAIL() << "failure forking";
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case 0: // post-fork child
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{
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ServiceImpl impl;
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grpc::ServerBuilder builder;
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builder.AddListeningPort(addr, grpc::InsecureServerCredentials());
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builder.RegisterService(&impl);
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std::unique_ptr<Server> server(builder.BuildAndStart());
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server->Wait();
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return;
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}
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default: // post-fork parent
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break;
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}
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// Do a round trip before we fork.
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// NOTE: without this scope, test running with the epoll1 poller will fail.
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{
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std::unique_ptr<EchoTestService::Stub> stub = MakeStub(addr);
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EchoRequest request;
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EchoResponse response;
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ClientContext context;
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context.set_wait_for_ready(true);
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auto stream = stub->BidiStream(&context);
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request.set_message("Hello");
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ASSERT_TRUE(stream->Write(request));
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ASSERT_TRUE(stream->Read(&response));
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ASSERT_EQ(response.message(), request.message());
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}
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// Fork and do round trips in the post-fork parent and child.
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pid_t child_client_pid = fork();
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switch (child_client_pid) {
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case -1: // fork failed
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GTEST_FAIL() << "fork failed";
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case 0: // post-fork child
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{
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VLOG(2) << "In post-fork child";
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EchoRequest request;
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EchoResponse response;
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ClientContext context;
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context.set_wait_for_ready(true);
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std::unique_ptr<EchoTestService::Stub> stub = MakeStub(addr);
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auto stream = stub->BidiStream(&context);
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request.set_message("Hello again from child");
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ASSERT_TRUE(stream->Write(request));
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ASSERT_TRUE(stream->Read(&response));
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ASSERT_EQ(response.message(), request.message());
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exit(0);
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}
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default: // post-fork parent
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{
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VLOG(2) << "In post-fork parent";
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EchoRequest request;
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EchoResponse response;
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ClientContext context;
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context.set_wait_for_ready(true);
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std::unique_ptr<EchoTestService::Stub> stub = MakeStub(addr);
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auto stream = stub->BidiStream(&context);
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request.set_message("Hello again from parent");
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EXPECT_TRUE(stream->Write(request));
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EXPECT_TRUE(stream->Read(&response));
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EXPECT_EQ(response.message(), request.message());
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// Wait for the post-fork child to exit; ensure it exited cleanly.
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int child_status;
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ASSERT_EQ(waitpid(child_client_pid, &child_status, 0), child_client_pid)
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<< "failed to get status of child client";
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ASSERT_EQ(WEXITSTATUS(child_status), 0) << "child did not exit cleanly";
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}
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}
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kill(server_pid, SIGINT);
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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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int main(int argc, char** argv) {
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testing::InitGoogleTest(&argc, argv);
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grpc::testing::InitTest(&argc, &argv, true);
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grpc::testing::TestEnvironment env(&argc, argv);
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grpc_init();
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int res = RUN_ALL_TESTS();
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grpc_shutdown();
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return res;
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}
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#endif // GRPC_ENABLE_FORK_SUPPORT
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