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/*
*
* Copyright 2018 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 <memory>
#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/gpr/tls.h"
#include "src/core/lib/iomgr/port.h"
#include "src/proto/grpc/testing/echo.grpc.pb.h"
#include "test/core/util/port.h"
#include "test/core/util/test_config.h"
#ifdef GRPC_POSIX_SOCKET
#include "src/core/lib/iomgr/ev_posix.h"
#endif // GRPC_POSIX_SOCKET
#include <gtest/gtest.h>
#ifdef GRPC_POSIX_SOCKET
// Thread-local variable to so that only polls from this test assert
// non-blocking (not polls from resolver, timer thread, etc), and only when the
// thread is waiting on polls caused by CompletionQueue::AsyncNext (not for
// picking a port or other reasons).
GPR_TLS_DECL(g_is_nonblocking_poll);
namespace {
int maybe_assert_non_blocking_poll(struct pollfd* pfds, nfds_t nfds,
int timeout) {
// Only assert that this poll should have zero timeout if we're in the
// middle of a zero-timeout CQ Next.
if (gpr_tls_get(&g_is_nonblocking_poll)) {
GPR_ASSERT(timeout == 0);
}
return poll(pfds, nfds, timeout);
}
} // namespace
namespace grpc {
namespace testing {
namespace {
void* tag(int i) { return reinterpret_cast<void*>(static_cast<intptr_t>(i)); }
int detag(void* p) { return static_cast<int>(reinterpret_cast<intptr_t>(p)); }
class NonblockingTest : public ::testing::Test {
protected:
NonblockingTest() {}
void SetUp() override {
port_ = grpc_pick_unused_port_or_die();
server_address_ << "localhost:" << port_;
// Setup server
BuildAndStartServer();
}
bool LoopForTag(void** tag, bool* ok) {
// Temporarily set the thread-local nonblocking poll flag so that the polls
// caused by this loop are indeed sent by the library with zero timeout.
intptr_t orig_val = gpr_tls_get(&g_is_nonblocking_poll);
gpr_tls_set(&g_is_nonblocking_poll, static_cast<intptr_t>(true));
for (;;) {
auto r = cq_->AsyncNext(tag, ok, gpr_time_0(GPR_CLOCK_REALTIME));
if (r == CompletionQueue::SHUTDOWN) {
gpr_tls_set(&g_is_nonblocking_poll, orig_val);
return false;
} else if (r == CompletionQueue::GOT_EVENT) {
gpr_tls_set(&g_is_nonblocking_poll, orig_val);
return true;
}
}
}
void TearDown() override {
server_->Shutdown();
void* ignored_tag;
bool ignored_ok;
cq_->Shutdown();
while (LoopForTag(&ignored_tag, &ignored_ok))
;
stub_.reset();
grpc_recycle_unused_port(port_);
}
void BuildAndStartServer() {
ServerBuilder builder;
builder.AddListeningPort(server_address_.str(),
grpc::InsecureServerCredentials());
service_.reset(new grpc::testing::EchoTestService::AsyncService());
builder.RegisterService(service_.get());
cq_ = builder.AddCompletionQueue();
server_ = builder.BuildAndStart();
}
void ResetStub() {
std::shared_ptr<Channel> channel = grpc::CreateChannel(
server_address_.str(), grpc::InsecureChannelCredentials());
stub_ = grpc::testing::EchoTestService::NewStub(channel);
}
void SendRpc(int num_rpcs) {
for (int i = 0; i < num_rpcs; i++) {
EchoRequest send_request;
EchoRequest recv_request;
EchoResponse send_response;
EchoResponse recv_response;
Status recv_status;
ClientContext cli_ctx;
ServerContext srv_ctx;
grpc::ServerAsyncResponseWriter<EchoResponse> response_writer(&srv_ctx);
send_request.set_message("hello non-blocking world");
std::unique_ptr<ClientAsyncResponseReader<EchoResponse>> response_reader(
stub_->PrepareAsyncEcho(&cli_ctx, send_request, cq_.get()));
response_reader->StartCall();
response_reader->Finish(&recv_response, &recv_status, tag(4));
service_->RequestEcho(&srv_ctx, &recv_request, &response_writer,
cq_.get(), cq_.get(), tag(2));
void* got_tag;
bool ok;
EXPECT_TRUE(LoopForTag(&got_tag, &ok));
EXPECT_TRUE(ok);
EXPECT_EQ(detag(got_tag), 2);
EXPECT_EQ(send_request.message(), recv_request.message());
send_response.set_message(recv_request.message());
response_writer.Finish(send_response, Status::OK, tag(3));
int tagsum = 0;
int tagprod = 1;
EXPECT_TRUE(LoopForTag(&got_tag, &ok));
EXPECT_TRUE(ok);
tagsum += detag(got_tag);
tagprod *= detag(got_tag);
EXPECT_TRUE(LoopForTag(&got_tag, &ok));
EXPECT_TRUE(ok);
tagsum += detag(got_tag);
tagprod *= detag(got_tag);
EXPECT_EQ(tagsum, 7);
EXPECT_EQ(tagprod, 12);
EXPECT_EQ(send_response.message(), recv_response.message());
EXPECT_TRUE(recv_status.ok());
}
}
std::unique_ptr<ServerCompletionQueue> cq_;
std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
std::unique_ptr<Server> server_;
std::unique_ptr<grpc::testing::EchoTestService::AsyncService> service_;
std::ostringstream server_address_;
int port_;
};
TEST_F(NonblockingTest, SimpleRpc) {
ResetStub();
SendRpc(10);
}
} // namespace
} // namespace testing
} // namespace grpc
#endif // GRPC_POSIX_SOCKET
int main(int argc, char** argv) {
#ifdef GRPC_POSIX_SOCKET
// Override the poll function before anything else can happen
grpc_poll_function = maybe_assert_non_blocking_poll;
grpc::testing::TestEnvironment env(argc, argv);
::testing::InitGoogleTest(&argc, argv);
gpr_tls_init(&g_is_nonblocking_poll);
// Start the nonblocking poll thread-local variable as false because the
// thread that issues RPCs starts by picking a port (which has non-zero
// timeout).
gpr_tls_set(&g_is_nonblocking_poll, static_cast<intptr_t>(false));
int ret = RUN_ALL_TESTS();
gpr_tls_destroy(&g_is_nonblocking_poll);
return ret;
#else // GRPC_POSIX_SOCKET
return 0;
#endif // GRPC_POSIX_SOCKET
}
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