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//===-- CommunicationTest.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/Communication.h"
#include "TestingSupport/SubsystemRAII.h"
#include "lldb/Core/ThreadedCommunication.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/ConnectionFileDescriptor.h"
#include "lldb/Host/Pipe.h"
#include "lldb/Host/Socket.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
#include <chrono>
#include <thread>
#if LLDB_ENABLE_POSIX
#include <fcntl.h>
#endif
using namespace lldb_private;
class CommunicationTest : public testing::Test {
private:
SubsystemRAII<Socket> m_subsystems;
};
static void CommunicationReadTest(bool use_read_thread) {
llvm::Expected<Socket::Pair> pair = Socket::CreatePair();
ASSERT_THAT_EXPECTED(pair, llvm::Succeeded());
Socket &a = *pair->first;
size_t num_bytes = 4;
ASSERT_THAT_ERROR(a.Write("test", num_bytes).ToError(), llvm::Succeeded());
ASSERT_EQ(num_bytes, 4U);
ThreadedCommunication comm("test");
comm.SetConnection(
std::make_unique<ConnectionFileDescriptor>(std::move(pair->second)));
comm.SetCloseOnEOF(true);
if (use_read_thread) {
ASSERT_TRUE(comm.StartReadThread());
}
// This read should wait for the data to become available and return it.
lldb::ConnectionStatus status = lldb::eConnectionStatusSuccess;
char buf[16];
Status error;
EXPECT_EQ(
comm.Read(buf, sizeof(buf), std::chrono::seconds(5), status, &error), 4U);
EXPECT_EQ(status, lldb::eConnectionStatusSuccess);
EXPECT_THAT_ERROR(error.ToError(), llvm::Succeeded());
buf[4] = 0;
EXPECT_STREQ(buf, "test");
// These reads should time out as there is no more data.
error.Clear();
EXPECT_EQ(comm.Read(buf, sizeof(buf), std::chrono::microseconds(10), status,
&error),
0U);
EXPECT_EQ(status, lldb::eConnectionStatusTimedOut);
EXPECT_THAT_ERROR(error.ToError(), llvm::Failed());
// 0 is special-cased, so we test it separately.
error.Clear();
EXPECT_EQ(
comm.Read(buf, sizeof(buf), std::chrono::seconds(0), status, &error), 0U);
EXPECT_EQ(status, lldb::eConnectionStatusTimedOut);
EXPECT_THAT_ERROR(error.ToError(), llvm::Failed());
// This read should return EOF.
ASSERT_THAT_ERROR(a.Close().ToError(), llvm::Succeeded());
error.Clear();
EXPECT_EQ(
comm.Read(buf, sizeof(buf), std::chrono::seconds(5), status, &error), 0U);
EXPECT_EQ(status, lldb::eConnectionStatusEndOfFile);
EXPECT_THAT_ERROR(error.ToError(), llvm::Succeeded());
// JoinReadThread() should just return immediately if there was no read
// thread started.
EXPECT_TRUE(comm.JoinReadThread());
// Test using Communication that is disconnected.
ASSERT_EQ(comm.Disconnect(), lldb::eConnectionStatusSuccess);
if (use_read_thread) {
ASSERT_TRUE(comm.StartReadThread());
}
error.Clear();
EXPECT_EQ(
comm.Read(buf, sizeof(buf), std::chrono::seconds(5), status, &error), 0U);
EXPECT_EQ(status, lldb::eConnectionStatusLostConnection);
EXPECT_THAT_ERROR(error.ToError(), llvm::Failed());
EXPECT_TRUE(comm.JoinReadThread());
// Test using Communication without a connection.
comm.SetConnection(nullptr);
if (use_read_thread) {
ASSERT_TRUE(comm.StartReadThread());
}
error.Clear();
EXPECT_EQ(
comm.Read(buf, sizeof(buf), std::chrono::seconds(5), status, &error), 0U);
EXPECT_EQ(status, lldb::eConnectionStatusNoConnection);
EXPECT_THAT_ERROR(error.ToError(), llvm::Failed());
EXPECT_TRUE(comm.JoinReadThread());
}
TEST_F(CommunicationTest, Read) {
CommunicationReadTest(/*use_thread=*/false);
}
TEST_F(CommunicationTest, ReadThread) {
CommunicationReadTest(/*use_thread=*/true);
}
TEST_F(CommunicationTest, SynchronizeWhileClosing) {
llvm::Expected<Socket::Pair> pair = Socket::CreatePair();
ASSERT_THAT_EXPECTED(pair, llvm::Succeeded());
Socket &a = *pair->first;
ThreadedCommunication comm("test");
comm.SetConnection(
std::make_unique<ConnectionFileDescriptor>(std::move(pair->second)));
comm.SetCloseOnEOF(true);
ASSERT_TRUE(comm.StartReadThread());
// Ensure that we can safely synchronize with the read thread while it is
// closing the read end (in response to us closing the write end).
ASSERT_THAT_ERROR(a.Close().ToError(), llvm::Succeeded());
comm.SynchronizeWithReadThread();
ASSERT_TRUE(comm.StopReadThread());
}
#if LLDB_ENABLE_POSIX
TEST_F(CommunicationTest, WriteAll) {
Pipe pipe;
ASSERT_THAT_ERROR(pipe.CreateNew().ToError(), llvm::Succeeded());
// Make the write end non-blocking in order to easily reproduce a partial
// write.
int write_fd = pipe.ReleaseWriteFileDescriptor();
int flags = fcntl(write_fd, F_GETFL);
ASSERT_NE(flags, -1);
ASSERT_NE(fcntl(write_fd, F_SETFL, flags | O_NONBLOCK), -1);
ConnectionFileDescriptor read_conn{pipe.ReleaseReadFileDescriptor(),
/*owns_fd=*/true};
Communication write_comm;
write_comm.SetConnection(
std::make_unique<ConnectionFileDescriptor>(write_fd, /*owns_fd=*/true));
std::thread read_thread{[&read_conn]() {
// Read using a smaller buffer to increase chances of partial write.
char buf[128 * 1024];
lldb::ConnectionStatus conn_status;
do {
read_conn.Read(buf, sizeof(buf), std::chrono::seconds(1), conn_status,
nullptr);
} while (conn_status != lldb::eConnectionStatusEndOfFile);
}};
// Write 1 MiB of data into the pipe.
lldb::ConnectionStatus conn_status;
Status error;
std::vector<uint8_t> data(1024 * 1024, 0x80);
EXPECT_EQ(write_comm.WriteAll(data.data(), data.size(), conn_status, &error),
data.size());
EXPECT_EQ(conn_status, lldb::eConnectionStatusSuccess);
EXPECT_FALSE(error.Fail());
// Close the write end in order to trigger EOF.
write_comm.Disconnect();
read_thread.join();
}
#endif
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