barrier/src/lib/synergy/StreamChunker.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2013-2016 Symless Ltd.
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 * 
 * This package 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "synergy/StreamChunker.h"

#include "mt/Lock.h"
#include "mt/Mutex.h"
#include "synergy/FileChunk.h"
#include "synergy/ClipboardChunk.h"
#include "synergy/protocol_types.h"
#include "base/EventTypes.h"
#include "base/Event.h"
#include "base/IEventQueue.h"
#include "base/EventTypes.h"
#include "base/Log.h"
#include "base/Stopwatch.h"
#include "base/String.h"
#include "common/stdexcept.h"

#include <fstream>

using namespace std;


static const double g_fakeHeartbeatThreshold = 3;
static const size_t g_chunkSize = 512 * 1024; //512kb

bool StreamChunker::s_isChunkingFile = false;
bool StreamChunker::s_interruptFile = false;
Mutex* StreamChunker::s_interruptMutex = NULL;

void
StreamChunker::sendFile(
				char* filename,
				IEventQueue* events,
				void* eventTarget)
{
	s_isChunkingFile = true;
	
	std::fstream file(reinterpret_cast<char*>(filename), std::ios::in | std::ios::binary);

	if (!file.is_open()) {
		throw runtime_error("failed to open file");
	}

	// check file size
	file.seekg (0, std::ios::end);
	size_t size = (size_t)file.tellg();

	// send first message (file size)
	String fileSize = synergy::string::sizeTypeToString(size);
	FileChunk* sizeMessage = FileChunk::start(fileSize);

	events->addEvent(Event(events->forFile().fileChunkSending(), eventTarget, sizeMessage));

	// send chunk messages with a fixed chunk size
	size_t sentLength = 0;
	size_t chunkSize = g_chunkSize;
	Stopwatch fakeHeartbeatStopwatch;
	fakeHeartbeatStopwatch.start();
	file.seekg (0, std::ios::beg);

	while (true) {
		if (s_interruptFile) {
			s_interruptFile = false;
			LOG((CLOG_DEBUG "file transmission interrupted"));
			break;
		}
		
		if (fakeHeartbeatStopwatch.getTime() > g_fakeHeartbeatThreshold) {
			events->addEvent(Event(events->forFile().keepAlive(), eventTarget));
			fakeHeartbeatStopwatch.reset();
		}
		
		// make sure we don't read too much from the mock data.
		if (sentLength + chunkSize > size) {
			chunkSize = size - sentLength;
		}

		char* chunkData = new char[chunkSize];
		file.read(chunkData, chunkSize);
		UInt8* data = reinterpret_cast<UInt8*>(chunkData);
		FileChunk* fileChunk = FileChunk::data(data, chunkSize);
		delete[] chunkData;

		events->addEvent(Event(events->forFile().fileChunkSending(), eventTarget, fileChunk));

		sentLength += chunkSize;
		file.seekg (sentLength, std::ios::beg);

		if (sentLength == size) {
			break;
		}
	}

	// send last message
	FileChunk* end = FileChunk::end();

	events->addEvent(Event(events->forFile().fileChunkSending(), eventTarget, end));

	file.close();
	
	s_isChunkingFile = false;
}

void
StreamChunker::sendClipboard(
				String& data,
				size_t size,
				ClipboardID id,
				UInt32 sequence,
				IEventQueue* events,
				void* eventTarget)
{
	// send first message (data size)
	String dataSize = synergy::string::sizeTypeToString(size);
	ClipboardChunk* sizeMessage = ClipboardChunk::start(id, sequence, dataSize);
	
	events->addEvent(Event(events->forClipboard().clipboardSending(), eventTarget, sizeMessage));

	// send clipboard chunk with a fixed size
	size_t sentLength = 0;
	size_t chunkSize = g_chunkSize;
	Stopwatch fakeHeartbeatStopwatch;
	fakeHeartbeatStopwatch.start();
	
	while (true) {
		if (fakeHeartbeatStopwatch.getTime() > g_fakeHeartbeatThreshold) {
			events->addEvent(Event(events->forFile().keepAlive(), eventTarget));
			fakeHeartbeatStopwatch.reset();
		}
		
		// make sure we don't read too much from the mock data.
		if (sentLength + chunkSize > size) {
			chunkSize = size - sentLength;
		}

		String chunk(data.substr(sentLength, chunkSize).c_str(), chunkSize);
		ClipboardChunk* dataChunk = ClipboardChunk::data(id, sequence, chunk);
		
		events->addEvent(Event(events->forClipboard().clipboardSending(), eventTarget, dataChunk));

		sentLength += chunkSize;
		if (sentLength == size) {
			break;
		}
	}

	// send last message
	ClipboardChunk* end = ClipboardChunk::end(id, sequence);

	events->addEvent(Event(events->forClipboard().clipboardSending(), eventTarget, end));
	
	LOG((CLOG_DEBUG "sent clipboard size=%d", sentLength));
}

void
StreamChunker::interruptFile()
{
	if (s_isChunkingFile) {
		s_interruptFile = true;
		LOG((CLOG_INFO "previous dragged file has become invalid"));
	}
}