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

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// 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/Fd.h"
#include "td/utils/common.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Observer.h"
#if TD_PORT_POSIX
#include <atomic>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#endif
#if TD_PORT_WINDOWS
#include "td/utils/buffer.h"
#include "td/utils/misc.h"
#include <cstring>
#endif
namespace td {
#if TD_PORT_POSIX
Fd::InfoSet::InfoSet() {
get_info(0).refcnt = 1;
get_info(1).refcnt = 1;
get_info(2).refcnt = 1;
}
Fd::Info &Fd::InfoSet::get_info(int32 id) {
CHECK(0 <= id && id < InfoSet::MAX_FD) << tag("fd", id);
return fd_array_[id];
}
Fd::InfoSet Fd::fd_info_set_;
// TODO(bug) if constuctor call tries to output something to the LOG it will fail, because log is not initialized
Fd Fd::stderr_(2, Mode::Reference);
Fd Fd::stdout_(1, Mode::Reference);
Fd Fd::stdin_(0, Mode::Reference);
Fd::Fd() = default;
Fd::Fd(int fd, Mode mode) : mode_(mode), fd_(fd) {
auto *info = get_info();
int old_ref_cnt = info->refcnt.load(std::memory_order_relaxed);
if (old_ref_cnt == 0) {
old_ref_cnt = info->refcnt.load(std::memory_order_acquire);
CHECK(old_ref_cnt == 0);
CHECK(mode_ == Mode::Owner) << tag("fd", fd_);
VLOG(fd) << "FD created [fd:" << fd_ << "]";
auto fcntl_res = fcntl(fd_, F_GETFD);
auto fcntl_errno = errno;
LOG_IF(FATAL, fcntl_res == -1) << Status::PosixError(fcntl_errno, "fcntl F_GET_FD failed");
info->refcnt.store(1, std::memory_order_relaxed);
CHECK(mode_ != Mode::Reference);
CHECK(info->observer == nullptr);
info->flags = 0;
info->observer = nullptr;
} else {
CHECK(mode_ == Mode::Reference) << tag("fd", fd_);
auto fcntl_res = fcntl(fd_, F_GETFD);
auto fcntl_errno = errno;
LOG_IF(FATAL, fcntl_res == -1) << Status::PosixError(fcntl_errno, "fcntl F_GET_FD failed");
CHECK(mode_ == Mode::Reference);
info->refcnt.fetch_add(1, std::memory_order_relaxed);
}
}
int Fd::move_as_native_fd() {
clear_info();
auto res = fd_;
fd_ = -1;
return res;
}
Fd::~Fd() {
close();
}
Fd::Fd(Fd &&other) {
fd_ = other.fd_;
mode_ = other.mode_;
other.fd_ = -1;
}
Fd &Fd::operator=(Fd &&other) {
if (this != &other) {
close();
fd_ = other.fd_;
mode_ = other.mode_;
other.fd_ = -1;
}
return *this;
}
Fd Fd::clone() const {
return Fd(fd_, Mode::Reference);
}
Fd &Fd::Stderr() {
return stderr_;
}
Fd &Fd::Stdout() {
return stdout_;
}
Fd &Fd::Stdin() {
return stdin_;
}
Status Fd::duplicate(const Fd &from, Fd &to) {
CHECK(!from.empty());
CHECK(!to.empty());
if (dup2(from.get_native_fd(), to.get_native_fd()) == -1) {
return OS_ERROR("dup2 failed");
}
return Status::OK();
}
bool Fd::empty() const {
return fd_ == -1;
}
const Fd &Fd::get_fd() const {
return *this;
}
Fd &Fd::get_fd() {
return *this;
}
int Fd::get_native_fd() const {
CHECK(!empty());
return fd_;
}
void Fd::set_observer(ObserverBase *observer) {
auto *info = get_info();
CHECK(observer == nullptr || info->observer == nullptr);
info->observer = observer;
}
ObserverBase *Fd::get_observer() const {
auto *info = get_info();
return info->observer;
}
void Fd::close_ref() {
CHECK(mode_ == Mode::Reference);
auto *info = get_info();
int old_ref_cnt = info->refcnt.fetch_sub(1, std::memory_order_relaxed);
CHECK(old_ref_cnt > 1) << tag("fd", fd_);
fd_ = -1;
}
void Fd::close_own() {
CHECK(mode_ == Mode::Owner);
VLOG(fd) << "FD closed [fd:" << fd_ << "]";
clear_info();
::close(fd_);
fd_ = -1;
}
void Fd::close() {
if (!empty()) {
switch (mode_) {
case Mode::Reference:
close_ref();
break;
case Mode::Owner:
close_own();
break;
}
}
}
Fd::Info *Fd::get_info() {
CHECK(!empty());
return &fd_info_set_.get_info(fd_);
}
const Fd::Info *Fd::get_info() const {
CHECK(!empty());
return &fd_info_set_.get_info(fd_);
}
void Fd::clear_info() {
CHECK(!empty());
CHECK(mode_ != Mode::Reference);
auto *info = get_info();
int old_ref_cnt = info->refcnt.load(std::memory_order_relaxed);
CHECK(old_ref_cnt == 1);
info->flags = 0;
info->observer = nullptr;
info->refcnt.store(0, std::memory_order_release);
}
void Fd::update_flags_notify(Flags flags) {
update_flags_inner(flags, true);
}
void Fd::update_flags(Flags flags) {
update_flags_inner(flags, false);
}
void Fd::update_flags_inner(int32 new_flags, bool notify_flag) {
if (new_flags & Error) {
new_flags |= Error;
new_flags |= Close;
}
auto *info = get_info();
int32 &flags = info->flags;
int32 old_flags = flags;
flags |= new_flags;
if (new_flags & Close) {
// TODO: ???
flags &= ~Write;
}
if (flags != old_flags) {
VLOG(fd) << "Update flags " << tag("fd", fd_) << tag("from", format::as_binary(old_flags))
<< tag("to", format::as_binary(flags));
}
if (flags != old_flags && notify_flag) {
auto observer = info->observer;
if (observer != nullptr) {
observer->notify();
}
}
}
Fd::Flags Fd::get_flags() const {
return get_info()->flags;
}
void Fd::clear_flags(Flags flags) {
get_info()->flags &= ~flags;
}
bool Fd::has_pending_error() const {
return (get_flags() & Fd::Flag::Error) != 0;
}
Status Fd::get_pending_error() {
if (!has_pending_error()) {
return Status::OK();
}
clear_flags(Fd::Error);
int error = 0;
socklen_t errlen = sizeof(error);
if (getsockopt(fd_, SOL_SOCKET, SO_ERROR, static_cast<void *>(&error), &errlen) == 0) {
if (error == 0) {
return Status::OK();
}
return Status::PosixError(error, PSLICE() << "Error on socket [fd_ = " << fd_ << "]");
}
auto status = OS_SOCKET_ERROR(PSLICE() << "Can't load error on socket [fd_ = " << fd_ << "]");
LOG(INFO) << "Can't load pending socket error: " << status;
return status;
}
Result<size_t> Fd::write_unsafe(Slice slice) {
int native_fd = get_native_fd();
auto write_res = skip_eintr([&] { return ::write(native_fd, slice.begin(), slice.size()); });
auto write_errno = errno;
if (write_res >= 0) {
return narrow_cast<size_t>(write_res);
}
return Status::PosixError(write_errno, PSLICE() << "Write to fd " << native_fd << " has failed");
}
Result<size_t> Fd::write(Slice slice) {
int native_fd = get_native_fd();
auto write_res = skip_eintr([&] { return ::write(native_fd, slice.begin(), slice.size()); });
auto write_errno = errno;
if (write_res >= 0) {
return narrow_cast<size_t>(write_res);
}
if (write_errno == EAGAIN
#if EAGAIN != EWOULDBLOCK
|| write_errno == EWOULDBLOCK
#endif
) {
clear_flags(Write);
return 0;
}
auto error = Status::PosixError(write_errno, PSLICE() << "Write to fd " << native_fd << " has failed");
switch (write_errno) {
case EBADF:
case ENXIO:
case EFAULT:
case EINVAL:
LOG(FATAL) << error;
UNREACHABLE();
default:
LOG(WARNING) << error;
// fallthrough
case ECONNRESET:
case EDQUOT:
case EFBIG:
case EIO:
case ENETDOWN:
case ENETUNREACH:
case ENOSPC:
case EPIPE:
clear_flags(Write);
update_flags(Close);
return std::move(error);
}
}
Result<size_t> Fd::read(MutableSlice slice) {
int native_fd = get_native_fd();
CHECK(slice.size() > 0);
auto read_res = skip_eintr([&] { return ::read(native_fd, slice.begin(), slice.size()); });
auto read_errno = errno;
if (read_res >= 0) {
if (read_res == 0) {
errno = 0;
clear_flags(Read);
update_flags(Close);
}
return narrow_cast<size_t>(read_res);
}
if (read_errno == EAGAIN
#if EAGAIN != EWOULDBLOCK
|| read_errno == EWOULDBLOCK
#endif
) {
clear_flags(Read);
return 0;
}
auto error = Status::PosixError(read_errno, PSLICE() << "Read from fd " << native_fd << " has failed");
switch (read_errno) {
case EISDIR:
case EBADF:
case ENXIO:
case EFAULT:
case EINVAL:
LOG(FATAL) << error;
UNREACHABLE();
default:
LOG(WARNING) << error;
// fallthrough
case ENOTCONN:
case EIO:
case ENOBUFS:
case ENOMEM:
case ECONNRESET:
case ETIMEDOUT:
clear_flags(Read);
update_flags(Close);
return std::move(error);
}
}
Status Fd::set_is_blocking(bool is_blocking) {
auto old_flags = fcntl(fd_, F_GETFL);
if (old_flags == -1) {
return OS_SOCKET_ERROR("Failed to get socket flags");
}
auto new_flags = is_blocking ? old_flags & ~O_NONBLOCK : old_flags | O_NONBLOCK;
if (new_flags != old_flags && fcntl(fd_, F_SETFL, new_flags) == -1) {
return OS_SOCKET_ERROR("Failed to set socket flags");
}
return Status::OK();
}
#endif
#if TD_PORT_WINDOWS
class Fd::FdImpl {
public:
FdImpl(Fd::Type type, HANDLE handle)
: type_(type), handle_(handle), async_mode_(type_ == Fd::Type::EventFd || type_ == Fd::Type::StdinFileFd) {
init();
}
FdImpl(Fd::Type type, SOCKET socket, int socket_family)
: type_(type), socket_(socket), socket_family_(socket_family), async_mode_(true) {
init();
}
FdImpl(const FdImpl &) = delete;
FdImpl &operator=(const FdImpl &) = delete;
FdImpl(FdImpl &&) = delete;
FdImpl &operator=(FdImpl &&) = delete;
~FdImpl() {
close();
}
void set_observer(ObserverBase *observer) {
observer_ = observer;
}
ObserverBase *get_observer() const {
return observer_;
}
void update_flags_notify(Fd::Flags flags) {
update_flags_inner(flags, true);
}
void update_flags(Fd::Flags flags) {
update_flags_inner(flags, false);
}
void update_flags_inner(int32 new_flags, bool notify_flag) {
if (new_flags & Fd::Error) {
new_flags |= Fd::Error;
new_flags |= Fd::Close;
}
int32 old_flags = flags_;
flags_ |= new_flags;
if (new_flags & Fd::Close) {
// TODO: ???
flags_ &= ~Fd::Write;
internal_flags_ &= ~Fd::Write;
}
if (flags_ != old_flags) {
VLOG(fd) << "Update flags " << tag("fd", get_io_handle()) << tag("from", format::as_binary(old_flags))
<< tag("to", format::as_binary(flags_));
}
if (flags_ != old_flags && notify_flag) {
auto observer = get_observer();
if (observer != nullptr) {
observer->notify();
}
}
}
int32 get_flags() const {
return flags_;
}
void clear_flags(Fd::Flags mask) {
flags_ &= ~mask;
}
Status get_pending_error() {
if (!has_pending_error()) {
return Status::OK();
}
clear_flags(Fd::Error);
return std::move(pending_error_);
}
bool has_pending_error() const {
return (get_flags() & Fd::Flag::Error) != 0;
}
HANDLE get_read_event() {
if (type() == Fd::Type::StdinFileFd) {
return get_io_handle();
}
return read_event_;
}
void on_read_event() {
if (type_ == Fd::Type::StdinFileFd) {
return try_read_stdin();
}
ResetEvent(read_event_);
if (type_ == Fd::Type::EventFd) {
return update_flags_notify(Fd::Flag::Read);
}
if (type_ == Fd::Type::SocketFd && !connected_) {
on_connect_ready();
} else {
if (!async_read_flag_) {
return;
}
if (type_ == Fd::Type::ServerSocketFd) {
on_accept_ready();
} else {
on_read_ready();
}
}
loop();
}
HANDLE get_write_event() {
return write_event_;
}
void on_write_event() {
CHECK(async_write_flag_);
ResetEvent(write_event_);
on_write_ready();
loop();
}
SOCKET get_native_socket() const {
return socket_;
}
HANDLE get_io_handle() const {
CHECK(!empty());
if (type() == Fd::Type::FileFd || type() == Fd::Type::StdinFileFd) {
return handle_;
}
return reinterpret_cast<HANDLE>(socket_);
}
Result<size_t> write(Slice slice) TD_WARN_UNUSED_RESULT {
if (async_mode_) {
return write_async(slice);
} else {
return write_sync(slice);
}
}
Result<size_t> read(MutableSlice slice) TD_WARN_UNUSED_RESULT {
if (async_mode_) {
return read_async(slice);
} else {
return read_sync(slice);
}
}
Result<size_t> write_async(Slice slice) TD_WARN_UNUSED_RESULT {
CHECK(async_mode_);
output_writer_.append(slice);
output_reader_.sync_with_writer();
loop();
return slice.size();
}
Result<size_t> write_sync(Slice slice) TD_WARN_UNUSED_RESULT {
CHECK(!async_mode_);
DWORD bytes_written = 0;
auto res = WriteFile(get_io_handle(), slice.data(), narrow_cast<DWORD>(slice.size()), &bytes_written, nullptr);
if (!res) {
return OS_ERROR("Failed to write_sync");
}
return bytes_written;
}
Result<size_t> read_async(MutableSlice slice) TD_WARN_UNUSED_RESULT {
CHECK(async_mode_);
auto res = input_reader_.advance(min(slice.size(), input_reader_.size()), slice);
if (res == 0) {
clear_flags(Fd::Flag::Read);
}
return res;
}
Result<size_t> read_sync(MutableSlice slice) TD_WARN_UNUSED_RESULT {
CHECK(!async_mode_);
DWORD bytes_read = 0;
auto res = ReadFile(get_io_handle(), slice.data(), narrow_cast<DWORD>(slice.size()), &bytes_read, nullptr);
if (!res) {
return OS_ERROR("Failed to read_sync");
}
if (bytes_read == 0) {
clear_flags(Fd::Flag::Read);
}
return bytes_read;
}
// for ServerSocket
Result<Fd> accept() {
if (accepted_.empty()) {
clear_flags(Fd::Flag::Read);
return Status::Error(-1, "Operation would block");
}
auto res = std::move(accepted_.back());
accepted_.pop_back();
return std::move(res);
}
void connect(const IPAddress &addr) {
CHECK(!connected_);
CHECK(type_ == Fd::Type::SocketFd);
DWORD bytes_read;
std::memset(&read_overlapped_, 0, sizeof(read_overlapped_));
read_overlapped_.hEvent = read_event_;
LPFN_CONNECTEX ConnectExPtr = nullptr;
GUID guid = WSAID_CONNECTEX;
DWORD numBytes;
int error = ::WSAIoctl(socket_, SIO_GET_EXTENSION_FUNCTION_POINTER, static_cast<void *>(&guid), sizeof(guid),
static_cast<void *>(&ConnectExPtr), sizeof(ConnectExPtr), &numBytes, nullptr, nullptr);
if (error) {
return on_error(OS_SOCKET_ERROR("WSAIoctl failed"), Fd::Flag::Read);
}
auto status = ConnectExPtr(socket_, addr.get_sockaddr(), narrow_cast<int>(addr.get_sockaddr_len()), nullptr, 0,
&bytes_read, &read_overlapped_);
if (status != 0) {
ResetEvent(read_event_);
connected_ = true;
update_flags_notify(Fd::Flag::Read);
return;
}
auto last_error = GetLastError();
if (last_error == ERROR_IO_PENDING) {
return;
}
on_error(OS_SOCKET_ERROR("ConnectEx failed"), Fd::Flag::Read);
}
// for EventFd
void release() {
CHECK(type_ == Fd::Type::EventFd);
SetEvent(read_event_);
}
void acquire() {
CHECK(type_ == Fd::Type::EventFd);
ResetEvent(read_event_);
clear_flags(Fd::Flag::Read);
}
// TODO: interface for BufferedFd optimization.
bool empty() const {
return type() == Fd::Type::Empty;
}
void close() {
if (empty()) {
return;
}
switch (type()) {
case Fd::Type::StdinFileFd:
case Fd::Type::FileFd: {
if (!CloseHandle(handle_)) {
auto error = OS_ERROR("Failed to close file");
LOG(ERROR) << error;
}
handle_ = INVALID_HANDLE_VALUE;
break;
}
case Fd::Type::ServerSocketFd:
case Fd::Type::SocketFd: {
if (closesocket(socket_) != 0) {
auto error = OS_SOCKET_ERROR("Failed to close socket");
LOG(ERROR) << error;
}
socket_ = INVALID_SOCKET;
break;
}
case Fd::Type::EventFd:
break;
default:
UNREACHABLE();
}
if (read_event_ != INVALID_HANDLE_VALUE) {
if (!CloseHandle(read_event_)) {
auto error = OS_ERROR("Failed to close event");
LOG(ERROR) << error;
}
read_event_ = INVALID_HANDLE_VALUE;
}
if (write_event_ != INVALID_HANDLE_VALUE) {
if (!CloseHandle(write_event_)) {
auto error = OS_ERROR("Failed to close event");
LOG(ERROR) << error;
}
write_event_ = INVALID_HANDLE_VALUE;
}
type_ = Fd::Type::Empty;
}
private:
Fd::Type type_;
HANDLE handle_ = INVALID_HANDLE_VALUE;
SOCKET socket_ = INVALID_SOCKET;
int socket_family_ = 0;
bool async_mode_ = false;
ObserverBase *observer_ = nullptr;
Fd::Flags flags_ = Fd::Flag::Write;
Status pending_error_;
Fd::Flags internal_flags_ = Fd::Flag::Write | Fd::Flag::Read;
HANDLE read_event_ = INVALID_HANDLE_VALUE; // used by WineventPoll
bool async_read_flag_ = false; // do we have pending read?
OVERLAPPED read_overlapped_;
ChainBufferWriter input_writer_;
ChainBufferReader input_reader_ = input_writer_.extract_reader();
bool connected_ = false;
std::vector<Fd> accepted_;
SOCKET accept_socket_ = INVALID_SOCKET;
static constexpr size_t MAX_ADDR_SIZE = sizeof(sockaddr_in6) + 16;
char addr_buf_[MAX_ADDR_SIZE * 2];
HANDLE write_event_ = INVALID_HANDLE_VALUE; // used by WineventPoll
bool async_write_flag_ = false; // do we have pending write?
OVERLAPPED write_overlapped_;
ChainBufferWriter output_writer_;
ChainBufferReader output_reader_ = output_writer_.extract_reader();
void init() {
if (async_mode_) {
if (type_ != Fd::Type::EventFd) {
write_event_ = CreateEventW(nullptr, true, false, nullptr);
}
read_event_ = CreateEventW(nullptr, true, false, nullptr);
loop();
}
}
Fd::Type type() const {
return type_;
}
void on_error(Status error, Fd::Flag flag) {
VLOG(fd) << tag("fd", get_io_handle()) << error;
pending_error_ = std::move(error);
internal_flags_ &= ~flag;
update_flags_notify(Fd::Flag::Error);
}
void on_eof() {
internal_flags_ &= ~Fd::Flag::Read;
update_flags_notify(Fd::Flag::Close);
}
void on_read_ready() {
async_read_flag_ = false;
DWORD bytes_read;
auto status = GetOverlappedResult(get_io_handle(), &read_overlapped_, &bytes_read, false);
if (status == 0) {
return on_error(OS_ERROR("ReadFile failed"), Fd::Flag::Read);
}
VLOG(fd) << "Read " << tag("fd", get_io_handle()) << tag("size", bytes_read);
if (bytes_read == 0) { // eof
return on_eof();
}
input_writer_.confirm_append(bytes_read);
input_reader_.sync_with_writer();
update_flags_notify(Fd::Flag::Read);
}
void on_write_ready() {
async_write_flag_ = false;
DWORD bytes_written;
auto status = GetOverlappedResult(get_io_handle(), &write_overlapped_, &bytes_written, false);
if (status == 0) {
return on_error(OS_ERROR("WriteFile failed"), Fd::Flag::Write);
}
if (bytes_written != 0) {
VLOG(fd) << "Write " << tag("fd", get_io_handle()) << tag("size", bytes_written);
output_reader_.confirm_read(bytes_written);
update_flags_notify(Fd::Flag::Write);
}
}
void on_accept_ready() {
async_read_flag_ = false;
DWORD bytes_read;
auto status = GetOverlappedResult(get_io_handle(), &read_overlapped_, &bytes_read, false);
if (status == 0) {
return on_error(OS_ERROR("AcceptEx failed"), Fd::Flag::Write);
}
accepted_.push_back(Fd::create_socket_fd(accept_socket_));
accept_socket_ = INVALID_SOCKET;
update_flags_notify(Fd::Flag::Read);
}
void on_connect_ready() {
async_read_flag_ = false;
DWORD bytes_read;
VLOG(fd) << "on_connect_ready";
auto status = GetOverlappedResult(get_io_handle(), &read_overlapped_, &bytes_read, false);
if (status == 0) {
return on_error(OS_ERROR("ConnectEx failed"), Fd::Flag::Write);
}
connected_ = true;
VLOG(fd) << "connected = true";
}
void try_read_stdin() {
}
void try_start_read() {
auto dest = input_writer_.prepare_append();
DWORD bytes_read;
std::memset(&read_overlapped_, 0, sizeof(read_overlapped_));
read_overlapped_.hEvent = read_event_;
VLOG(fd) << "try_read..";
auto status =
ReadFile(get_io_handle(), dest.data(), narrow_cast<DWORD>(dest.size()), &bytes_read, &read_overlapped_);
if (status != 0) { // ok
ResetEvent(read_event_);
VLOG(fd) << "Read " << tag("fd", get_io_handle()) << tag("size", bytes_read);
if (bytes_read == 0) { // eof
return on_eof();
}
input_writer_.confirm_append(bytes_read);
input_reader_.sync_with_writer();
update_flags_notify(Fd::Flag::Read);
return;
}
auto last_error = GetLastError();
if (last_error == ERROR_IO_PENDING) {
async_read_flag_ = true;
return;
}
on_error(OS_ERROR("ReadFile failed"), Fd::Flag::Read);
}
void try_start_write() {
auto dest = output_reader_.prepare_read();
DWORD bytes_written;
std::memset(&write_overlapped_, 0, sizeof(write_overlapped_));
write_overlapped_.hEvent = write_event_;
VLOG(fd) << "try_start_write";
auto status =
WriteFile(get_io_handle(), dest.data(), narrow_cast<DWORD>(dest.size()), &bytes_written, &write_overlapped_);
if (status != 0) { // ok
VLOG(fd) << "Write " << tag("fd", get_io_handle()) << tag("size", bytes_written);
ResetEvent(write_event_);
output_reader_.confirm_read(bytes_written);
update_flags_notify(Fd::Flag::Write);
return;
}
auto last_error = GetLastError();
if (last_error == ERROR_IO_PENDING) {
VLOG(fd) << "try_start_write: ERROR_IO_PENDING";
async_write_flag_ = true;
return;
}
CHECK(WaitForSingleObject(write_event_, 0) != WAIT_OBJECT_0);
on_error(OS_ERROR("WriteFile failed"), Fd::Flag::Write);
}
void try_start_accept() {
if (async_read_flag_ == true) {
return;
}
accept_socket_ = socket(socket_family_, SOCK_STREAM, 0);
DWORD bytes_read;
std::memset(&read_overlapped_, 0, sizeof(read_overlapped_));
read_overlapped_.hEvent = read_event_;
auto status =
AcceptEx(socket_, accept_socket_, addr_buf_, 0, MAX_ADDR_SIZE, MAX_ADDR_SIZE, &bytes_read, &read_overlapped_);
if (status != 0) {
ResetEvent(read_event_);
accepted_.push_back(Fd::create_socket_fd(accept_socket_));
accept_socket_ = INVALID_SOCKET;
update_flags_notify(Fd::Flag::Read);
return;
}
auto last_error = GetLastError();
if (last_error == ERROR_IO_PENDING) {
async_read_flag_ = true;
return;
}
on_error(OS_SOCKET_ERROR("AcceptExFailed"), Fd::Flag::Read);
}
void loop() {
CHECK(async_mode_);
if (type_ == Fd::Type::EventFd) {
return;
}
if (type_ == Fd::Type::ServerSocketFd) {
while (async_read_flag_ == false && (internal_flags_ & Fd::Flag::Read) != 0) {
// read always
try_start_accept();
}
return;
}
if (!connected_) {
return;
}
while (async_read_flag_ == false && (internal_flags_ & Fd::Flag::Read) != 0) {
// read always
try_start_read();
}
VLOG(fd) << (async_write_flag_ == false) << " " << output_reader_.size() << " "
<< ((internal_flags_ & Fd::Flag::Write) != 0);
while (async_write_flag_ == false && output_reader_.size() && (internal_flags_ & Fd::Flag::Write) != 0) {
// write if we have data to write
try_start_write();
}
}
};
Fd::Fd() = default;
Fd::Fd(Fd &&other) = default;
Fd &Fd::operator=(Fd &&other) = default;
Fd::~Fd() = default;
Fd Fd::create_file_fd(HANDLE handle) {
return Fd(Fd::Type::FileFd, Fd::Mode::Owner, handle);
}
Fd Fd::create_socket_fd(SOCKET sock) {
return Fd(Fd::Type::SocketFd, Fd::Mode::Owner, sock, AF_UNSPEC);
}
Fd Fd::create_server_socket_fd(SOCKET sock, int socket_family) {
return Fd(Fd::Type::ServerSocketFd, Fd::Mode::Owner, sock, socket_family);
}
Fd Fd::create_event_fd() {
return Fd(Fd::Type::EventFd, Fd::Mode::Owner, INVALID_HANDLE_VALUE);
}
const Fd &Fd::get_fd() const {
return *this;
}
Fd &Fd::get_fd() {
return *this;
}
Result<size_t> Fd::read(MutableSlice slice) {
return impl_->read(slice);
}
Result<size_t> Fd::write(Slice slice) {
CHECK(!empty());
return impl_->write(slice);
}
bool Fd::empty() const {
return !impl_;
}
void Fd::close() {
impl_.reset();
}
Result<Fd> Fd::accept() {
return impl_->accept();
}
void Fd::connect(const IPAddress &addr) {
return impl_->connect(addr);
}
Fd Fd::clone() const {
return Fd(impl_);
}
uint64 Fd::get_key() const {
return reinterpret_cast<uint64>(impl_.get());
}
void Fd::set_observer(ObserverBase *observer) {
return impl_->set_observer(observer);
}
ObserverBase *Fd::get_observer() const {
return impl_->get_observer();
}
Fd::Flags Fd::get_flags() const {
return impl_->get_flags();
}
void Fd::update_flags(Flags flags) {
impl_->update_flags(flags);
}
void Fd::on_read_event() {
impl_->on_read_event();
}
void Fd::on_write_event() {
impl_->on_write_event();
}
bool Fd::has_pending_error() const {
return impl_->has_pending_error();
}
Status Fd::get_pending_error() {
return impl_->get_pending_error();
}
HANDLE Fd::get_read_event() {
return impl_->get_read_event();
}
HANDLE Fd::get_write_event() {
return impl_->get_write_event();
}
SOCKET Fd::get_native_socket() const {
return impl_->get_native_socket();
}
HANDLE Fd::get_io_handle() const {
return impl_->get_io_handle();
}
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
Fd &Fd::Stderr() {
static auto handle = GetStdHandle(STD_ERROR_HANDLE);
LOG_IF(FATAL, handle == INVALID_HANDLE_VALUE) << "Failed to get stderr";
static auto fd = Fd(Fd::Type::FileFd, Fd::Mode::Reference, handle);
return fd;
}
Fd &Fd::Stdin() {
static auto handle = GetStdHandle(STD_INPUT_HANDLE);
LOG_IF(FATAL, handle == INVALID_HANDLE_VALUE) << "Failed to get stdin";
static auto fd = Fd(Fd::Type::FileFd, Fd::Mode::Reference, handle);
return fd;
}
Fd &Fd::Stdout() {
static auto handle = GetStdHandle(STD_OUTPUT_HANDLE);
LOG_IF(FATAL, handle == INVALID_HANDLE_VALUE) << "Failed to get stdout";
static auto fd = Fd(Fd::Type::FileFd, Fd::Mode::Reference, handle);
return fd;
}
#else
Fd &Fd::Stderr() {
static Fd result;
result = Fd();
return result;
}
Fd &Fd::Stdin() {
static Fd result;
result = Fd();
return result;
}
Fd &Fd::Stdout() {
static Fd result;
result = Fd();
return result;
}
#endif
Status Fd::duplicate(const Fd &from, Fd &to) {
return Status::Error("Not supported");
}
Status Fd::set_is_blocking(bool is_blocking) {
return detail::set_native_socket_is_blocking(get_native_socket(), is_blocking);
}
Fd::Fd(Type type, Mode mode, HANDLE handle) : mode_(mode), impl_(std::make_shared<FdImpl>(type, handle)) {
}
Fd::Fd(Type type, Mode mode, SOCKET sock, int socket_family)
: mode_(mode), impl_(std::make_shared<FdImpl>(type, sock, socket_family)) {
}
Fd::Fd(std::shared_ptr<FdImpl> impl) : mode_(Mode::Reference), impl_(std::move(impl)) {
}
void Fd::acquire() {
return impl_->acquire();
}
void Fd::release() {
return impl_->release();
}
class InitWSA {
public:
InitWSA() {
/* Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h */
WORD wVersionRequested = MAKEWORD(2, 2);
WSADATA wsaData;
if (WSAStartup(wVersionRequested, &wsaData) != 0) {
auto error = OS_SOCKET_ERROR("Failed to init WSA");
LOG(FATAL) << error;
}
}
};
static InitWSA init_wsa;
#endif
namespace detail {
#if TD_PORT_POSIX
Status set_native_socket_is_blocking(int fd, bool is_blocking) {
if (fcntl(fd, F_SETFL, is_blocking ? 0 : O_NONBLOCK) == -1) {
#elif TD_PORT_WINDOWS
Status set_native_socket_is_blocking(SOCKET fd, bool is_blocking) {
u_long mode = is_blocking;
if (ioctlsocket(fd, FIONBIO, &mode) != 0) {
#endif
return OS_SOCKET_ERROR("Failed to change socket flags");
}
return Status::OK();
}
} // namespace detail
} // namespace td