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- /**
- \file rcvthread.cpp
- \author michael.zohner@ec-spride.de
- \copyright ABY - A Framework for Efficient Mixed-protocol Secure Two-party Computation
- Copyright (C) 2019 ENCRYPTO Group, TU Darmstadt
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published
- by the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
- ABY is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- \brief Receiver Thread Implementation
- */
- #include "rcvthread.h"
- #include "typedefs.h"
- #include "constants.h"
- #include "socket.h"
- #include <cassert>
- #include <cstdlib>
- #include <iostream>
- RcvThread::RcvThread(CSocket* sock, CLock *glock)
- :rcvlock(glock), mysock(sock), listeners()
- {
- listeners[ADMIN_CHANNEL].inuse = true;
- }
- RcvThread::~RcvThread() {
- this->Wait();
- for(size_t i = 0; i < listeners.size(); i++) {
- flush_queue(i);
- }
- //delete rcvlock;
- }
- CLock* RcvThread::getlock() const {
- return rcvlock;
- }
- void RcvThread::setlock(CLock *glock) {
- rcvlock = glock;
- }
- void RcvThread::flush_queue(uint8_t channelid) {
- std::lock_guard<std::mutex> lock(listeners[channelid].rcv_buf_mutex);
- while(!listeners[channelid].rcv_buf.empty()) {
- rcv_ctx* tmp = listeners[channelid].rcv_buf.front();
- free(tmp->buf);
- free(tmp);
- listeners[channelid].rcv_buf.pop();
- }
- }
- void RcvThread::remove_listener(uint8_t channelid) {
- rcvlock->Lock();
- if(listeners[channelid].inuse) {
- listeners[channelid].fin_event->Set();
- listeners[channelid].inuse = false;
- #ifdef DEBUG_RECEIVE_THREAD
- std::cout << "Unsetting channel " << (uint32_t) channelid << std::endl;
- #endif
- } else {
- listeners[channelid].forward_notify_fin = true;
- }
- rcvlock->Unlock();
- }
- std::queue<rcv_ctx*>*
- RcvThread::add_listener(uint8_t channelid, CEvent* rcv_event, CEvent* fin_event) {
- rcvlock->Lock();
- #ifdef DEBUG_RECEIVE_THREAD
- std::cout << "Registering listener on channel " << (uint32_t) channelid << std::endl;
- #endif
- if(listeners[channelid].inuse || channelid == ADMIN_CHANNEL) {
- std::cerr << "A listener has already been registered on channel " << (uint32_t) channelid << std::endl;
- assert(!listeners[channelid].inuse);
- assert(channelid != ADMIN_CHANNEL);
- }
- //listeners[channelid].rcv_buf = rcv_buf;
- listeners[channelid].rcv_event = rcv_event;
- listeners[channelid].fin_event = fin_event;
- listeners[channelid].inuse = true;
- // assert(listeners[channelid].rcv_buf->empty());
- //std::cout << "Successfully registered on channel " << (uint32_t) channelid << std::endl;
- rcvlock->Unlock();
- if(listeners[channelid].forward_notify_fin) {
- listeners[channelid].forward_notify_fin = false;
- remove_listener(channelid);
- }
- return &listeners[channelid].rcv_buf;
- }
- std::mutex& RcvThread::get_listener_mutex(uint8_t channelid)
- {
- return listeners[channelid].rcv_buf_mutex;
- }
- void RcvThread::ThreadMain() {
- uint8_t channelid;
- uint64_t rcvbytelen;
- uint64_t rcv_len;
- while(true) {
- //std::cout << "Starting to receive data" << std::endl;
- rcv_len = 0;
- rcv_len += mysock->Receive(&channelid, sizeof(uint8_t));
- rcv_len += mysock->Receive(&rcvbytelen, sizeof(uint64_t));
- if(rcv_len > 0) {
- #ifdef DEBUG_RECEIVE_THREAD
- std::cout << "Received value on channel " << (uint32_t) channelid << " with " << rcvbytelen <<
- " bytes length (" << rcv_len << ")" << std::endl;
- #endif
- if(channelid == ADMIN_CHANNEL) {
- std::vector<uint8_t> tmprcvbuf(rcvbytelen);
- mysock->Receive(tmprcvbuf.data(), rcvbytelen);
- //TODO: Right now finish, can be used for other maintenance tasks
- //std::cout << "Got message on Admin channel, shutting down" << std::endl;
- #ifdef DEBUG_RECEIVE_THREAD
- std::cout << "Receiver thread is being killed" << std::endl;
- #endif
- return;//continue;
- }
- if(rcvbytelen == 0) {
- remove_listener(channelid);
- } else {
- rcv_ctx* rcv_buf = (rcv_ctx*) malloc(sizeof(rcv_ctx));
- rcv_buf->buf = (uint8_t*) malloc(rcvbytelen);
- rcv_buf->rcvbytes = rcvbytelen;
- mysock->Receive(rcv_buf->buf, rcvbytelen);
- rcvlock->Lock();
- {
- std::lock_guard<std::mutex> lock(listeners[channelid].rcv_buf_mutex);
- listeners[channelid].rcv_buf.push(rcv_buf);
- }
- bool cond = listeners[channelid].inuse;
- rcvlock->Unlock();
- if(cond)
- listeners[channelid].rcv_event->Set();
- }
- } else {
- // We received 0 bytes, probably due to some major error. Just return.
- // TODO: Probably add some more elaborate error handling.
- return;
- }
- }
- }
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