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/* Copyright (C) 2016 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "NetFileTransfer.h"
#include "lib/timer.h"
#include "network/NetMessage.h"
#include "network/NetSession.h"
#include "ps/CLogger.h"
Status CNetFileTransferer::HandleMessageReceive(const CNetMessage* message)
{
if (message->GetType() == NMT_FILE_TRANSFER_RESPONSE)
{
CFileTransferResponseMessage* respMessage = (CFileTransferResponseMessage*)message;
if (m_FileReceiveTasks.find(respMessage->m_RequestID) == m_FileReceiveTasks.end())
{
LOGERROR("Net transfer: Unsolicited file transfer response (id=%d)", (int)respMessage->m_RequestID);
return ERR::FAIL;
}
if (respMessage->m_Length == 0 || respMessage->m_Length > MAX_FILE_TRANSFER_SIZE)
{
LOGERROR("Net transfer: Invalid size for file transfer response (length=%d)", (int)respMessage->m_Length);
return ERR::FAIL;
}
shared_ptr<CNetFileReceiveTask> task = m_FileReceiveTasks[respMessage->m_RequestID];
task->m_Length = respMessage->m_Length;
task->m_Buffer.reserve(respMessage->m_Length);
LOGMESSAGERENDER("Downloading data over network (%d KB) - please wait...", (int)(task->m_Length/1024));
m_LastProgressReportTime = timer_Time();
return INFO::OK;
}
else if (message->GetType() == NMT_FILE_TRANSFER_DATA)
{
CFileTransferDataMessage* dataMessage = (CFileTransferDataMessage*)message;
if (m_FileReceiveTasks.find(dataMessage->m_RequestID) == m_FileReceiveTasks.end())
{
LOGERROR("Net transfer: Unsolicited file transfer data (id=%d)", (int)dataMessage->m_RequestID);
return ERR::FAIL;
}
shared_ptr<CNetFileReceiveTask> task = m_FileReceiveTasks[dataMessage->m_RequestID];
task->m_Buffer += dataMessage->m_Data;
if (task->m_Buffer.size() > task->m_Length)
{
LOGERROR("Net transfer: Invalid size for file transfer data (length=%d actual=%d)", (int)task->m_Length, (int)task->m_Buffer.size());
return ERR::FAIL;
}
CFileTransferAckMessage ackMessage;
ackMessage.m_RequestID = task->m_RequestID;
ackMessage.m_NumPackets = 1; // TODO: would be nice to send a single ack for multiple packets at once
m_Session->SendMessage(&ackMessage);
if (task->m_Buffer.size() == task->m_Length)
{
LOGMESSAGERENDER("Download completed");
task->OnComplete();
m_FileReceiveTasks.erase(dataMessage->m_RequestID);
return INFO::OK;
}
// TODO: should report progress using proper GUI
// Report the download status occassionally
double t = timer_Time();
if (t > m_LastProgressReportTime + 0.5)
{
LOGMESSAGERENDER("Downloading data: %.1f%% of %d KB", 100.f*task->m_Buffer.size()/task->m_Length, (int)(task->m_Length/1024));
m_LastProgressReportTime = t;
}
return INFO::OK;
}
else if (message->GetType() == NMT_FILE_TRANSFER_ACK)
{
CFileTransferAckMessage* ackMessage = (CFileTransferAckMessage*)message;
if (m_FileSendTasks.find(ackMessage->m_RequestID) == m_FileSendTasks.end())
{
LOGERROR("Net transfer: Unsolicited file transfer ack (id=%d)", (int)ackMessage->m_RequestID);
return ERR::FAIL;
}
CNetFileSendTask& task = m_FileSendTasks[ackMessage->m_RequestID];
if (ackMessage->m_NumPackets > task.packetsInFlight)
{
LOGERROR("Net transfer: Invalid num packets for file transfer ack (num=%d inflight=%d)",
(int)ackMessage->m_NumPackets, (int)task.packetsInFlight);
return ERR::FAIL;
}
task.packetsInFlight -= ackMessage->m_NumPackets;
return INFO::OK;
}
return INFO::SKIPPED;
}
void CNetFileTransferer::StartTask(const shared_ptr<CNetFileReceiveTask>& task)
{
u32 requestID = m_NextRequestID++;
task->m_RequestID = requestID;
m_FileReceiveTasks[requestID] = task;
CFileTransferRequestMessage request;
request.m_RequestID = requestID;
m_Session->SendMessage(&request);
}
void CNetFileTransferer::StartResponse(u32 requestID, const std::string& data)
{
CNetFileSendTask task;
task.requestID = requestID;
task.buffer = data;
task.offset = 0;
task.packetsInFlight = 0;
task.maxWindowSize = DEFAULT_FILE_TRANSFER_WINDOW_SIZE;
m_FileSendTasks[task.requestID] = task;
CFileTransferResponseMessage respMessage;
respMessage.m_RequestID = requestID;
respMessage.m_Length = task.buffer.size();
m_Session->SendMessage(&respMessage);
}
void CNetFileTransferer::Poll()
{
// Find tasks which have fewer packets in flight than their window size,
// and send more packets
for (std::pair<const u32, CNetFileSendTask>& p : m_FileSendTasks)
{
CNetFileSendTask& task = p.second;
while (task.packetsInFlight < task.maxWindowSize && task.offset < task.buffer.size())
{
CFileTransferDataMessage dataMessage;
dataMessage.m_RequestID = task.requestID;
ssize_t packetSize = std::min(DEFAULT_FILE_TRANSFER_PACKET_SIZE, task.buffer.size() - task.offset);
dataMessage.m_Data = task.buffer.substr(task.offset, packetSize);
task.offset += packetSize;
++task.packetsInFlight;
m_Session->SendMessage(&dataMessage);
}
}
// TODO: need to garbage-collect finished tasks
}
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