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