298 lines
9.7 KiB
C++
298 lines
9.7 KiB
C++
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// Copyright (c) 2012-2014, The CryptoNote developers, The Bytecoin developers
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//
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// This file is part of Bytecoin.
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//
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// Bytecoin is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Bytecoin is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
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#include "TcpConnection.h"
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#include <iostream>
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#include <sys/epoll.h>
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#include <errno.h>
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#include <unistd.h>
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#include <assert.h>
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#include <stdexcept>
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#include <sys/socket.h>
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#include "Dispatcher.h"
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#include "InterruptedException.h"
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using namespace System;
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namespace {
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struct ConnectionContext : public Dispatcher::ContextExt {
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bool interrupted;
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};
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}
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TcpConnection::TcpConnection() : dispatcher(nullptr) {
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}
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TcpConnection::TcpConnection(Dispatcher& dispatcher, int socket) : dispatcher(&dispatcher), connection(socket), stopped(false), context(nullptr) {
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epoll_event connectionEvent;
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connectionEvent.data.fd = connection;
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connectionEvent.events = 0;
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connectionEvent.data.ptr = nullptr;
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if (epoll_ctl(dispatcher.getEpoll(), EPOLL_CTL_ADD, socket, &connectionEvent) == -1) {
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std::cerr << errno << std::endl;
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throw std::runtime_error("epoll_ctl() fail");
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}
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}
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TcpConnection::TcpConnection(TcpConnection&& other) : dispatcher(other.dispatcher) {
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if (other.dispatcher != nullptr) {
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connection = other.connection;
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stopped = other.stopped;
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context = other.context;
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other.dispatcher = nullptr;
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}
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}
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TcpConnection::~TcpConnection() {
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if (dispatcher != nullptr) {
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assert(context == nullptr);
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if (close(connection) == -1) {
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std::cerr << "close() failed, errno=" << errno << '.' << std::endl;
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}
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}
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}
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TcpConnection& TcpConnection::operator=(TcpConnection&& other) {
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if (dispatcher != nullptr) {
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assert(context == nullptr);
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if (close(connection) == -1) {
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std::cerr << "close() failed, errno=" << errno << '.' << std::endl;
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throw std::runtime_error("TcpConnection::operator=");
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}
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}
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dispatcher = other.dispatcher;
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if (other.dispatcher != nullptr) {
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connection = other.connection;
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stopped = other.stopped;
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context = other.context;
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other.dispatcher = nullptr;
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}
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return *this;
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}
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void TcpConnection::start() {
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assert(dispatcher != nullptr);
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assert(stopped);
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stopped = false;
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}
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void TcpConnection::stop() {
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assert(dispatcher != nullptr);
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assert(!stopped);
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if (context != nullptr) {
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ConnectionContext *context2 = static_cast<ConnectionContext *>(context);
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if (!context2->interrupted) {
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epoll_event connectionEvent;
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connectionEvent.data.fd = connection;
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connectionEvent.events = 0;
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connectionEvent.data.ptr = nullptr;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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std::cerr << errno << std::endl;
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throw std::runtime_error("epoll_ctl() fail");
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}
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context2->interrupted = true;
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if (context2->context != nullptr) {
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dispatcher->pushContext(context2->context);
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}
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if (context2->writeContext != nullptr) {
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dispatcher->pushContext(context2->writeContext);
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}
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}
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}
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stopped = true;
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}
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size_t TcpConnection::read(uint8_t* data, size_t size) {
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assert(dispatcher != nullptr);
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assert(context == nullptr || static_cast<Dispatcher::ContextExt*>(context)->context == nullptr);
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if (stopped) {
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throw InterruptedException();
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}
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ssize_t transferred = ::recv(connection, (void *)data, size, 0);
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if (transferred == -1) {
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if (errno != EAGAIN && errno != EWOULDBLOCK) {
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std::cerr << "recv failed, result=" << errno << '.' << std::endl;
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} else {
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epoll_event connectionEvent;
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connectionEvent.data.fd = connection;
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ConnectionContext context2;
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if (context == nullptr) {
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context2.writeContext = nullptr;
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context2.interrupted = false;
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context2.context = dispatcher->getCurrentContext();
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context = &context2;
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connectionEvent.events = EPOLLIN | EPOLLONESHOT;
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} else {
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assert(static_cast<Dispatcher::ContextExt*>(context)->writeContext != nullptr);
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connectionEvent.events = EPOLLIN | EPOLLOUT | EPOLLONESHOT;
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}
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connectionEvent.data.ptr = context;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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std::cerr << "epoll_ctl() failed, errno=" << errno << '.' << std::endl;
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} else {
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dispatcher->yield();
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assert(dispatcher != nullptr);
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assert(context2.context == dispatcher->getCurrentContext());
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if (static_cast<ConnectionContext*>(context)->interrupted) {
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context = nullptr;
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throw InterruptedException();
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}
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assert(static_cast<Dispatcher::ContextExt*>(context)->context == context2.context);
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if (static_cast<Dispatcher::ContextExt*>(context)->writeContext != nullptr) { //write is presented, rearm
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static_cast<Dispatcher::ContextExt*>(context)->context = nullptr;
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epoll_event connectionEvent;
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connectionEvent.data.fd = connection;
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connectionEvent.events = EPOLLOUT | EPOLLONESHOT;
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connectionEvent.data.ptr = context;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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std::cerr << "epoll_ctl() failed, errno=" << errno << '.' << std::endl;
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throw std::runtime_error("TcpConnection::read");
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}
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} else {
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context = nullptr;
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}
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ssize_t transferred = ::recv(connection, (void *)data, size, 0);
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if (transferred == -1) {
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std::cerr << "recv failed, errno=" << errno << '.' << std::endl;
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} else {
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if (transferred == 0) {
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std::cerr << "recv return after yield with 0 bytes" << std::endl;
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int retval = -1;
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socklen_t retValLen = sizeof(retval);
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int s = getsockopt(connection, SOL_SOCKET, SO_ERROR, &retval, &retValLen);
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if (s == -1) {
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std::cerr << "getsockopt() failed, errno=" << errno << '.' << std::endl;
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} else {
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std::cerr << "recv getsockopt retval = " << retval << std::endl;
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}
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}
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assert(transferred <= size);
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return transferred;
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}
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}
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}
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throw std::runtime_error("TcpConnection::read");
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}
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assert(transferred <= size);
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return transferred;
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}
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void TcpConnection::write(const uint8_t* data, size_t size) {
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assert(dispatcher != nullptr);
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assert(context == nullptr || static_cast<Dispatcher::ContextExt*>(context)->writeContext == nullptr);
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if (stopped) {
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throw InterruptedException();
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}
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if (size == 0) {
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if (shutdown(connection, SHUT_WR) == -1) {
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std::cerr << "shutdown failed, errno=" << errno << '.' << std::endl;
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throw std::runtime_error("TcpConnection::write");
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}
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return;
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}
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ssize_t transferred = ::send(connection, (void *)data, size, 0);
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if (transferred == -1) {
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if (errno != EAGAIN && errno != EWOULDBLOCK) {
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std::cerr << "send failed, result=" << errno << '.' << std::endl;
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} else {
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epoll_event connectionEvent;
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connectionEvent.data.fd = connection;
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ConnectionContext context2;
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if (context == nullptr) {
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context2.context = nullptr;
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context2.interrupted = false;
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context2.writeContext = dispatcher->getCurrentContext();
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context = &context2;
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connectionEvent.events = EPOLLOUT | EPOLLONESHOT;
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} else {
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assert(static_cast<Dispatcher::ContextExt*>(context)->context != nullptr);
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connectionEvent.events = EPOLLIN | EPOLLOUT | EPOLLONESHOT;
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}
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connectionEvent.data.ptr = context;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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std::cerr << "epoll_ctl() failed, errno=" << errno << '.' << std::endl;
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} else {
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dispatcher->yield();
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assert(dispatcher != nullptr);
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assert(context2.writeContext == dispatcher->getCurrentContext());
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if (static_cast<ConnectionContext*>(context)->interrupted) {
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context = nullptr;
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throw InterruptedException();
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}
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assert(static_cast<Dispatcher::ContextExt*>(context)->writeContext == context2.writeContext);
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if (static_cast<Dispatcher::ContextExt*>(context)->context != nullptr) { //read is presented, rearm
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static_cast<Dispatcher::ContextExt*>(context)->writeContext = nullptr;
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epoll_event connectionEvent;
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connectionEvent.data.fd = connection;
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connectionEvent.events = EPOLLIN | EPOLLONESHOT;
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connectionEvent.data.ptr = context;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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std::cerr << "epoll_ctl() failed, errno=" << errno << '.' << std::endl;
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throw std::runtime_error("TcpConnection::write");
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}
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} else {
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context = nullptr;
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}
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ssize_t transferred = ::send(connection, (void *)data, size, 0);
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if (transferred == -1) {
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std::cerr << "send failed, errno=" << errno << '.' << std::endl;
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} else {
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if (transferred == 0) {
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throw std::runtime_error("send transferred 0 bytes.");
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}
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assert(transferred == size);
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return;
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}
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}
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}
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throw std::runtime_error("TcpConnection::write");
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}
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}
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