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/* Copyright (C) 2021 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)
{
switch (message.GetType())
{
case NMT_FILE_TRANSFER_RESPONSE:
return OnFileTransferResponse(static_cast<const CFileTransferResponseMessage&>(message));
case NMT_FILE_TRANSFER_DATA:
return OnFileTransferData(static_cast<const CFileTransferDataMessage&>(message));
case NMT_FILE_TRANSFER_ACK:
return OnFileTransferAck(static_cast<const CFileTransferAckMessage&>(message));
default:
return INFO::SKIPPED;
}
}
Status CNetFileTransferer::OnFileTransferResponse(const CFileTransferResponseMessage& message)
{
const FileReceiveTasksMap::iterator it = m_FileReceiveTasks.find(message.m_RequestID);
if (it == m_FileReceiveTasks.end())
{
LOGERROR("Net transfer: Unsolicited file transfer response (id=%lu)", message.m_RequestID);
return ERR::FAIL;
}
if (message.m_Length == 0 || message.m_Length > MAX_FILE_TRANSFER_SIZE)
{
LOGERROR("Net transfer: Invalid size for file transfer response (length=%lu)", message.m_Length);
return ERR::FAIL;
}
CNetFileReceiveTask& task = *it->second;
task.m_Length = message.m_Length;
task.m_Buffer.reserve(message.m_Length);
LOGMESSAGERENDER("Downloading data over network (%lu KB) - please wait...", task.m_Length / 1024);
m_LastProgressReportTime = timer_Time();
return INFO::OK;
}
Status CNetFileTransferer::OnFileTransferData(const CFileTransferDataMessage& message)
{
FileReceiveTasksMap::iterator it = m_FileReceiveTasks.find(message.m_RequestID);
if (it == m_FileReceiveTasks.end())
{
LOGERROR("Net transfer: Unsolicited file transfer data (id=%lu)", message.m_RequestID);
return ERR::FAIL;
}
CNetFileReceiveTask& task = *it->second;
task.m_Buffer += message.m_Data;
if (task.m_Buffer.size() > task.m_Length)
{
LOGERROR("Net transfer: Invalid size for file transfer data (length=%lu actual=%zu)", task.m_Length, 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(message.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 %lu KB", 100.f * task.m_Buffer.size() / task.m_Length, task.m_Length / 1024);
m_LastProgressReportTime = t;
}
return INFO::OK;
}
Status CNetFileTransferer::OnFileTransferAck(const CFileTransferAckMessage& message)
{
FileSendTasksMap::iterator it = m_FileSendTasks.find(message.m_RequestID);
if (it == m_FileSendTasks.end())
{
LOGERROR("Net transfer: Unsolicited file transfer ack (id=%lu)", message.m_RequestID);
return ERR::FAIL;
}
CNetFileSendTask& task = it->second;
if (message.m_NumPackets > task.packetsInFlight)
{
LOGERROR("Net transfer: Invalid num packets for file transfer ack (num=%lu inflight=%lu)",
message.m_NumPackets, task.packetsInFlight);
return ERR::FAIL;
}
task.packetsInFlight -= message.m_NumPackets;
return INFO::OK;
}
void CNetFileTransferer::StartTask(const std::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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