301 lines
7.4 KiB
C++
301 lines
7.4 KiB
C++
#include "driver/io-unix.h"
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#include <sstream>
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namespace saw {
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namespace unix {
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IFdOwner::IFdOwner(UnixEventPort &event_port, int file_descriptor, int fd_flags,
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uint32_t event_mask)
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: event_port{event_port}, file_descriptor{file_descriptor},
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fd_flags{fd_flags}, event_mask{event_mask} {
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event_port.subscribe(*this, file_descriptor, event_mask);
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}
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IFdOwner::~IFdOwner() {
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if (file_descriptor >= 0) {
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event_port.unsubscribe(file_descriptor);
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::close(file_descriptor);
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}
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}
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ssize_t unixRead(int fd, void *buffer, size_t length) {
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return ::recv(fd, buffer, length, 0);
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}
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ssize_t unixWrite(int fd, const void *buffer, size_t length) {
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return ::send(fd, buffer, length, 0);
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}
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UnixIoStream::UnixIoStream(UnixEventPort &event_port, int file_descriptor,
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int fd_flags, uint32_t event_mask)
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: IFdOwner{event_port, file_descriptor, fd_flags, event_mask | EPOLLRDHUP} {
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}
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ErrorOr<size_t> UnixIoStream::read(void *buffer, size_t length) {
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ssize_t read_bytes = unixRead(fd(), buffer, length);
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if (read_bytes > 0) {
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return static_cast<size_t>(read_bytes);
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} else if (read_bytes == 0) {
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return criticalError("Disconnected", Error::Code::Disconnected);
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}
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return recoverableError("Currently busy");
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}
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Conveyor<void> UnixIoStream::readReady() {
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auto caf = newConveyorAndFeeder<void>();
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read_ready = std::move(caf.feeder);
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return std::move(caf.conveyor);
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}
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Conveyor<void> UnixIoStream::onReadDisconnected() {
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auto caf = newConveyorAndFeeder<void>();
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on_read_disconnect = std::move(caf.feeder);
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return std::move(caf.conveyor);
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}
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ErrorOr<size_t> UnixIoStream::write(const void *buffer, size_t length) {
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ssize_t write_bytes = unixWrite(fd(), buffer, length);
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if (write_bytes > 0) {
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return static_cast<size_t>(write_bytes);
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}
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int error = errno;
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if (error == EAGAIN || error == EWOULDBLOCK) {
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return recoverableError("Currently busy");
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}
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return criticalError("Disconnected", Error::Code::Disconnected);
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}
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Conveyor<void> UnixIoStream::writeReady() {
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auto caf = newConveyorAndFeeder<void>();
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write_ready = std::move(caf.feeder);
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return std::move(caf.conveyor);
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}
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void UnixIoStream::notify(uint32_t mask) {
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if (mask & EPOLLOUT) {
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if (write_ready) {
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write_ready->feed();
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}
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}
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if (mask & EPOLLIN) {
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if (read_ready) {
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read_ready->feed();
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}
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}
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if (mask & EPOLLRDHUP) {
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if (on_read_disconnect) {
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on_read_disconnect->feed();
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}
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}
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}
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UnixServer::UnixServer(UnixEventPort &event_port, int file_descriptor,
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int fd_flags)
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: IFdOwner{event_port, file_descriptor, fd_flags, EPOLLIN} {}
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Conveyor<Own<IoStream>> UnixServer::accept() {
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auto caf = newConveyorAndFeeder<Own<IoStream>>();
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accept_feeder = std::move(caf.feeder);
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return std::move(caf.conveyor);
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}
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void UnixServer::notify(uint32_t mask) {
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if (mask & EPOLLIN) {
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if (accept_feeder) {
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struct ::sockaddr_storage address;
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socklen_t address_length = sizeof(address);
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int accept_fd =
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::accept4(fd(), reinterpret_cast<struct ::sockaddr *>(&address),
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&address_length, SOCK_NONBLOCK | SOCK_CLOEXEC);
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if (accept_fd < 0) {
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return;
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}
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auto fd_stream = heap<UnixIoStream>(event_port, accept_fd, 0,
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EPOLLIN | EPOLLOUT);
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accept_feeder->feed(std::move(fd_stream));
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}
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}
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}
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namespace {
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bool beginsWith(const std::string_view &viewed,
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const std::string_view &begins) {
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return viewed.size() >= begins.size() &&
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viewed.compare(0, begins.size(), begins) == 0;
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}
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} // namespace
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Own<Server> UnixNetworkAddress::listen() {
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assert(addresses.size() > 0);
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if (addresses.size() == 0) {
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return nullptr;
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}
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int fd = addresses.front().socket(SOCK_STREAM);
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if (fd < 0) {
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return nullptr;
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}
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int val = 1;
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::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
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bool failed = addresses.front().bind(fd);
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if (failed) {
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return nullptr;
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}
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::listen(fd, SOMAXCONN);
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return heap<UnixServer>(event_port, fd, 0);
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}
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Conveyor<Own<IoStream>> UnixNetworkAddress::connect() {
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assert(addresses.size() > 0);
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if (addresses.size() == 0) {
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return Conveyor<Own<IoStream>>{criticalError("No address found")};
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}
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int fd = addresses.front().socket(SOCK_STREAM);
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if (fd < 0) {
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return Conveyor<Own<IoStream>>{criticalError("Couldn't open socket")};
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}
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Own<UnixIoStream> io_stream =
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heap<UnixIoStream>(event_port, fd, 0, EPOLLIN | EPOLLOUT);
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bool success = false;
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for (auto iter = addresses.begin(); iter != addresses.end(); ++iter) {
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int status = ::connect(fd, iter->getRaw(), iter->getRawLength());
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if (status < 0) {
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int error = errno;
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/*
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* It's not connected yet...
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* But edge triggered epolling means that it'll
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* be ready when the signal is triggered
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*/
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/// @todo Add limit node when implemented
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if (error == EINPROGRESS) {
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/*
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Conveyor<void> write_ready = io_stream->writeReady();
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return write_ready.then(
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[ios{std::move(io_stream)}]() mutable {
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ios->write_ready = nullptr;
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return std::move(ios);
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});
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*/
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success = true;
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break;
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} else if (error != EINTR) {
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/// @todo Push error message from
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return Conveyor<Own<IoStream>>{
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criticalError("Couldn't connect")};
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}
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} else {
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success = true;
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break;
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}
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}
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if (!success) {
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return criticalError("Couldn't connect");
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}
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return Conveyor<Own<IoStream>>{std::move(io_stream)};
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}
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Own<Datagram> UnixNetworkAddress::datagram() {
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SAW_ASSERT(addresses.size() > 0) { return nullptr; }
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int fd = addresses.front().socket(SOCK_DGRAM);
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int optval = 1;
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int rc =
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::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
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SAW_ASSERT(rc == 0) {
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::close(fd);
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return nullptr;
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}
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addresses.front().bind(fd);
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/// @todo
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return nullptr;
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}
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std::string UnixNetworkAddress::toString() const {
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try {
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std::ostringstream oss;
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oss << "Address: " << path;
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if (port_hint > 0) {
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oss << "\nPort: " << port_hint;
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}
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return oss.str();
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} catch (std::bad_alloc &) {
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return {};
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}
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}
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const std::string &UnixNetworkAddress::address() const { return path; }
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uint16_t UnixNetworkAddress::port() const { return port_hint; }
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UnixNetwork::UnixNetwork(UnixEventPort &event) : event_port{event} {}
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Conveyor<Own<NetworkAddress>> UnixNetwork::parseAddress(const std::string &path,
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uint16_t port_hint) {
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std::string_view addr_view{path};
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{
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std::string_view begins_with = "unix:";
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if (beginsWith(addr_view, begins_with)) {
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addr_view.remove_prefix(begins_with.size());
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}
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}
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std::list<SocketAddress> addresses =
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SocketAddress::parse(addr_view, port_hint);
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return Conveyor<Own<NetworkAddress>>{heap<UnixNetworkAddress>(
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event_port, path, port_hint, std::move(addresses))};
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}
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UnixIoProvider::UnixIoProvider(UnixEventPort &port_ref, Own<EventPort> port)
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: event_port{port_ref}, event_loop{std::move(port)}, unix_network{
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port_ref} {}
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Own<InputStream> UnixIoProvider::wrapInputFd(int fd) {
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return heap<UnixIoStream>(event_port, fd, 0, EPOLLIN);
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}
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Network &UnixIoProvider::network() {
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return static_cast<Network &>(unix_network);
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}
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EventLoop &UnixIoProvider::eventLoop() { return event_loop; }
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} // namespace unix
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ErrorOr<AsyncIoContext> setupAsyncIo() {
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using namespace unix;
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try {
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Own<UnixEventPort> prt = heap<UnixEventPort>();
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UnixEventPort &prt_ref = *prt;
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Own<UnixIoProvider> io_provider =
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heap<UnixIoProvider>(prt_ref, std::move(prt));
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EventLoop &loop_ref = io_provider->eventLoop();
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return {{std::move(io_provider), loop_ref, prt_ref}};
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} catch (std::bad_alloc &) {
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return criticalError("Out of memory");
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}
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}
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} // namespace saw
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