/**
\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 .
\brief Receiver Thread Implementation
*/
#include "rcvthread.h"
#include "typedefs.h"
#include "constants.h"
#include "socket.h"
#include
#include
#include
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 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*
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 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 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;
}
}
}