281 lines
9.9 KiB
C++
Executable file
281 lines
9.9 KiB
C++
Executable file
// Copyright (c) 2012-2015, 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 <arpa/inet.h>
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#include <cassert>
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#include <sys/epoll.h>
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#include <unistd.h>
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#include <System/ErrorMessage.h>
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#include <System/InterruptedException.h>
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#include <System/Ipv4Address.h>
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namespace System {
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TcpConnection::TcpConnection() : dispatcher(nullptr) {
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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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assert(other.contextPair.writeContext == nullptr);
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assert(other.contextPair.readContext == nullptr);
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connection = other.connection;
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contextPair = other.contextPair;
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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(contextPair.readContext == nullptr);
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assert(contextPair.writeContext == nullptr);
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int result = close(connection);
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assert(result != -1);
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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(contextPair.readContext == nullptr);
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assert(contextPair.writeContext == nullptr);
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if (close(connection) == -1) {
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throw std::runtime_error("TcpConnection::operator=, close failed, " + lastErrorMessage());
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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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assert(other.contextPair.readContext == nullptr);
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assert(other.contextPair.writeContext == nullptr);
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connection = other.connection;
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contextPair = other.contextPair;
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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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size_t TcpConnection::read(uint8_t* data, size_t size) {
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assert(dispatcher != nullptr);
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assert(contextPair.readContext == nullptr);
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if (dispatcher->interrupted()) {
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throw InterruptedException();
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}
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std::string message;
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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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message = "recv failed, " + lastErrorMessage();
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} else {
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epoll_event connectionEvent;
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OperationContext operationContext;
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operationContext.interrupted = false;
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operationContext.context = dispatcher->getCurrentContext();
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contextPair.readContext = &operationContext;
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connectionEvent.data.ptr = &contextPair;
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if(contextPair.writeContext != nullptr) {
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connectionEvent.events = EPOLLIN | EPOLLOUT | EPOLLONESHOT;
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} else {
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connectionEvent.events = EPOLLIN | EPOLLONESHOT;
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}
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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message = "epoll_ctl failed, " + lastErrorMessage();
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} else {
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dispatcher->getCurrentContext()->interruptProcedure = [&]() {
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assert(dispatcher != nullptr);
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assert(contextPair.readContext != nullptr);
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epoll_event connectionEvent;
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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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throw std::runtime_error("TcpConnection::stop, epoll_ctl failed, " + lastErrorMessage());
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}
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contextPair.readContext->interrupted = true;
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dispatcher->pushContext(contextPair.readContext->context);
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};
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dispatcher->dispatch();
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dispatcher->getCurrentContext()->interruptProcedure = nullptr;
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assert(dispatcher != nullptr);
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assert(operationContext.context == dispatcher->getCurrentContext());
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assert(contextPair.readContext == &operationContext);
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if (operationContext.interrupted) {
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contextPair.readContext = nullptr;
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throw InterruptedException();
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}
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contextPair.readContext = nullptr;
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if(contextPair.writeContext != nullptr) { //write is presented, rearm
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epoll_event connectionEvent;
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connectionEvent.events = EPOLLOUT | EPOLLONESHOT;
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connectionEvent.data.ptr = &contextPair;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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message = "epoll_ctl failed, " + lastErrorMessage();
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throw std::runtime_error("TcpConnection::read");
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}
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}
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if((operationContext.events & (EPOLLERR | EPOLLHUP)) != 0) {
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throw std::runtime_error("TcpConnection::read");
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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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message = "recv failed, " + lastErrorMessage();
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} else {
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assert(transferred <= static_cast<ssize_t>(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, "+ message);
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}
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assert(transferred <= static_cast<ssize_t>(size));
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return transferred;
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}
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std::size_t TcpConnection::write(const uint8_t* data, size_t size) {
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assert(dispatcher != nullptr);
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assert(contextPair.writeContext == nullptr);
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if (dispatcher->interrupted()) {
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throw InterruptedException();
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}
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std::string message;
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if(size == 0) {
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if(shutdown(connection, SHUT_WR) == -1) {
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throw std::runtime_error("TcpConnection::write, shutdown failed, " + lastErrorMessage());
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}
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return 0;
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}
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ssize_t transferred = ::send(connection, (void *)data, size, MSG_NOSIGNAL);
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if (transferred == -1) {
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if (errno != EAGAIN && errno != EWOULDBLOCK) {
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message = "send failed, " + lastErrorMessage();
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} else {
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epoll_event connectionEvent;
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OperationContext operationContext;
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operationContext.interrupted = false;
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operationContext.context = dispatcher->getCurrentContext();
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contextPair.writeContext = &operationContext;
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connectionEvent.data.ptr = &contextPair;
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if(contextPair.readContext != nullptr) {
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connectionEvent.events = EPOLLIN | EPOLLOUT | EPOLLONESHOT;
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} else {
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connectionEvent.events = EPOLLOUT | EPOLLONESHOT;
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}
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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message = "epoll_ctl failed, " + lastErrorMessage();
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} else {
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dispatcher->getCurrentContext()->interruptProcedure = [&]() {
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assert(dispatcher != nullptr);
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assert(contextPair.writeContext != nullptr);
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epoll_event connectionEvent;
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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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throw std::runtime_error("TcpConnection::stop, epoll_ctl failed, " + lastErrorMessage());
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}
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contextPair.writeContext->interrupted = true;
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dispatcher->pushContext(contextPair.writeContext->context);
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};
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dispatcher->dispatch();
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dispatcher->getCurrentContext()->interruptProcedure = nullptr;
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assert(dispatcher != nullptr);
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assert(operationContext.context == dispatcher->getCurrentContext());
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assert(contextPair.writeContext == &operationContext);
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if (operationContext.interrupted) {
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contextPair.writeContext = nullptr;
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throw InterruptedException();
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}
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contextPair.writeContext = nullptr;
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if(contextPair.readContext != nullptr) { //read is presented, rearm
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epoll_event connectionEvent;
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connectionEvent.events = EPOLLIN | EPOLLONESHOT;
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connectionEvent.data.ptr = &contextPair;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, connection, &connectionEvent) == -1) {
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message = "epoll_ctl failed, " + lastErrorMessage();
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throw std::runtime_error("TcpConnection::write, " + message);
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}
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}
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if((operationContext.events & (EPOLLERR | EPOLLHUP)) != 0) {
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throw std::runtime_error("TcpConnection::write, events & (EPOLLERR | EPOLLHUP) != 0");
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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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message = "send failed, " + lastErrorMessage();
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} else {
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assert(transferred <= static_cast<ssize_t>(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::write, " + message);
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}
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assert(transferred <= static_cast<ssize_t>(size));
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return transferred;
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}
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std::pair<Ipv4Address, uint16_t> TcpConnection::getPeerAddressAndPort() const {
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sockaddr_in addr;
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socklen_t size = sizeof(addr);
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if (getpeername(connection, reinterpret_cast<sockaddr*>(&addr), &size) != 0) {
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throw std::runtime_error("TcpConnection::getPeerAddress, getpeername failed, " + lastErrorMessage());
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}
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assert(size == sizeof(sockaddr_in));
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return std::make_pair(Ipv4Address(htonl(addr.sin_addr.s_addr)), htons(addr.sin_port));
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}
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TcpConnection::TcpConnection(Dispatcher& dispatcher, int socket) : dispatcher(&dispatcher), connection(socket) {
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contextPair.readContext = nullptr;
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contextPair.writeContext = nullptr;
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epoll_event connectionEvent;
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connectionEvent.events = EPOLLONESHOT;
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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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throw std::runtime_error("TcpConnection::TcpConnection, epoll_ctl failed, " + lastErrorMessage());
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}
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}
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}
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