tdlight/tdutils/td/utils/port/StdStreams.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/port/StdStreams.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/port/detail/Iocp.h"
#include "td/utils/port/detail/NativeFd.h"
#include "td/utils/port/PollFlags.h"
#include "td/utils/port/thread.h"
#include "td/utils/Slice.h"
#include <atomic>
namespace td {
#if TD_PORT_POSIX
template <int id>
static FileFd &get_file_fd() {
static FileFd result = FileFd::from_native_fd(NativeFd(id, true));
static auto guard = td::ScopeExit() + [&] { result.move_as_native_fd().release(); };
return result;
}
FileFd &Stdin() {
return get_file_fd<0>();
}
FileFd &Stdout() {
return get_file_fd<1>();
}
FileFd &Stderr() {
return get_file_fd<2>();
}
#elif TD_PORT_WINDOWS
template <DWORD id>
static FileFd &get_file_fd() {
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
static auto handle = GetStdHandle(id);
LOG_IF(FATAL, handle == INVALID_HANDLE_VALUE) << "Failed to GetStdHandle " << id;
static FileFd result = FileFd::from_native_fd(NativeFd(handle, true));
static auto guard = td::ScopeExit() + [&] { result.move_as_native_fd().release(); };
#else
static FileFd result;
#endif
return result;
}
FileFd &Stdin() {
return get_file_fd<STD_INPUT_HANDLE>();
}
FileFd &Stdout() {
return get_file_fd<STD_OUTPUT_HANDLE>();
}
FileFd &Stderr() {
return get_file_fd<STD_ERROR_HANDLE>();
}
#endif
#if TD_PORT_WINDOWS
namespace detail {
class BufferedStdinImpl : public Iocp::Callback {
public:
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
BufferedStdinImpl() : info_(NativeFd(GetStdHandle(STD_INPUT_HANDLE), true)) {
iocp_ref_ = Iocp::get()->get_ref();
read_thread_ = td::thread([this] { this->read_loop(); });
}
#else
BufferedStdinImpl() {
close();
}
#endif
BufferedStdinImpl(const BufferedStdinImpl &) = delete;
BufferedStdinImpl &operator=(const BufferedStdinImpl &) = delete;
BufferedStdinImpl(BufferedStdinImpl &&) = delete;
BufferedStdinImpl &operator=(BufferedStdinImpl &&) = delete;
~BufferedStdinImpl() {
info_.move_as_native_fd().release();
}
void close() {
close_flag_ = true;
}
ChainBufferReader &input_buffer() {
return reader_;
}
PollableFdInfo &get_poll_info() {
return info_;
}
const PollableFdInfo &get_poll_info() const {
return info_;
}
Result<size_t> flush_read(size_t max_read = std::numeric_limits<size_t>::max()) TD_WARN_UNUSED_RESULT {
info_.get_flags();
info_.clear_flags(PollFlags::Read());
reader_.sync_with_writer();
return reader_.size();
}
private:
PollableFdInfo info_;
ChainBufferWriter writer_;
ChainBufferReader reader_ = writer_.extract_reader();
td::thread read_thread_;
std::atomic<bool> close_flag_{false};
IocpRef iocp_ref_;
std::atomic<int> refcnt_{1};
void read_loop() {
while (!close_flag_) {
auto slice = writer_.prepare_append();
auto r_size = read(slice);
if (r_size.is_error()) {
LOG(ERROR) << "Stop read stdin loop: " << r_size.error();
break;
}
writer_.confirm_append(r_size.ok());
if (iocp_ref_.post(0, this, nullptr)) {
inc_refcnt();
}
}
if (!iocp_ref_.post(0, this, nullptr)) {
dec_refcnt();
}
}
void on_iocp(Result<size_t> r_size, WSAOVERLAPPED *overlapped) override {
info_.add_flags_from_poll(td::PollFlags::Read());
dec_refcnt();
}
bool dec_refcnt() {
if (--refcnt_ == 0) {
delete this;
return true;
}
return false;
}
void inc_refcnt() {
CHECK(refcnt_ != 0);
refcnt_++;
}
Result<size_t> read(MutableSlice slice) {
auto native_fd = info_.native_fd().fd();
DWORD bytes_read = 0;
auto res = ReadFile(native_fd, slice.data(), narrow_cast<DWORD>(slice.size()), &bytes_read, nullptr);
if (res) {
return static_cast<size_t>(bytes_read);
}
return OS_ERROR(PSLICE() << "Read from " << info_.native_fd() << " has failed");
}
};
void BufferedStdinImplDeleter::operator()(BufferedStdinImpl *impl) {
// LOG(ERROR) << "Close";
impl->close();
}
} // namespace detail
#elif TD_PORT_POSIX
namespace detail {
class BufferedStdinImpl {
public:
BufferedStdinImpl() {
file_fd_ = FileFd::from_native_fd(NativeFd(Stdin().get_native_fd().fd()));
file_fd_.get_native_fd().set_is_blocking(false);
}
BufferedStdinImpl(const BufferedStdinImpl &) = delete;
BufferedStdinImpl &operator=(const BufferedStdinImpl &) = delete;
BufferedStdinImpl(BufferedStdinImpl &&) = delete;
BufferedStdinImpl &operator=(BufferedStdinImpl &&) = delete;
~BufferedStdinImpl() {
file_fd_.get_native_fd().set_is_blocking(true);
file_fd_.move_as_native_fd().release();
}
ChainBufferReader &input_buffer() {
return reader_;
}
PollableFdInfo &get_poll_info() {
return file_fd_.get_poll_info();
}
const PollableFdInfo &get_poll_info() const {
return file_fd_.get_poll_info();
}
Result<size_t> flush_read(size_t max_read = std::numeric_limits<size_t>::max()) TD_WARN_UNUSED_RESULT {
size_t result = 0;
while (::td::can_read(*this) && max_read) {
MutableSlice slice = writer_.prepare_append().truncate(max_read);
TRY_RESULT(x, file_fd_.read(slice));
slice.truncate(x);
writer_.confirm_append(x);
result += x;
max_read -= x;
}
if (result) {
reader_.sync_with_writer();
}
return result;
}
private:
FileFd file_fd_;
ChainBufferWriter writer_;
ChainBufferReader reader_ = writer_.extract_reader();
};
void BufferedStdinImplDeleter::operator()(BufferedStdinImpl *impl) {
delete impl;
}
} // namespace detail
#endif
BufferedStdin::BufferedStdin() : impl_(make_unique<detail::BufferedStdinImpl>().release()) {
}
BufferedStdin::BufferedStdin(BufferedStdin &&) = default;
BufferedStdin &BufferedStdin::operator=(BufferedStdin &&) = default;
BufferedStdin::~BufferedStdin() = default;
ChainBufferReader &BufferedStdin::input_buffer() {
return impl_->input_buffer();
}
PollableFdInfo &BufferedStdin::get_poll_info() {
return impl_->get_poll_info();
}
const PollableFdInfo &BufferedStdin::get_poll_info() const {
return impl_->get_poll_info();
}
Result<size_t> BufferedStdin::flush_read(size_t max_read) {
return impl_->flush_read(max_read);
}
} // namespace td