barrier/lib/client/CServerProxy.cpp

#include "CServerProxy.h"
#include "CProtocolUtil.h"
#include "IClient.h"
#include "ProtocolTypes.h"
#include "IInputStream.h"
#include "IOutputStream.h"
#include "CLock.h"
#include "CLog.h"
#include "CStopwatch.h"
#include "XBase.h"
#include <memory>

//
// CServerProxy
//

CServerProxy::CServerProxy(IClient* client,
				IInputStream* adoptedInput, IOutputStream* adoptedOutput) :
	m_client(client),
	m_input(adoptedInput),
	m_output(adoptedOutput),
	m_seqNum(0)
{
	assert(m_client != NULL);
	assert(m_input  != NULL);
	assert(m_output != NULL);
}

CServerProxy::~CServerProxy()
{
	delete m_input;
	delete m_output;
}

bool
CServerProxy::mainLoop()
{
	bool failedToConnect = false;
	try {
		// no compressed mouse motion yet
		m_compressMouse = false;

		// not ignoring mouse motions
		m_ignoreMouse   = false;

		// reset sequence number
		m_seqNum        = 0;

		// handle messages from server
		CStopwatch heartbeat;
		for (;;) {
			// if no input is pending then flush compressed mouse motion
			if (getInputStream()->getSize() == 0) {
				flushCompressedMouse();
			}

			// wait for a message
			log((CLOG_DEBUG2 "waiting for message"));
			UInt8 code[4];
			UInt32 n = getInputStream()->read(code, 4, kHeartRate);

			// check if server hungup
			if (n == 0) {
				log((CLOG_NOTE "server disconnected"));
				break;
			}

			// check for time out
			if (n == (UInt32)-1 || heartbeat.getTime() > kHeartRate) {
				// send heartbeat
				CLock lock(&m_mutex);
				CProtocolUtil::writef(getOutputStream(), kMsgCNoop);
				heartbeat.reset();
				if (n == (UInt32)-1) {
					// no message to process
					continue;
				}
			}

			// verify we got an entire code
			if (n != 4) {
				// client sent an incomplete message
				log((CLOG_ERR "incomplete message from server"));
				break;
			}

			// parse message
			log((CLOG_DEBUG2 "msg from server: %c%c%c%c", code[0], code[1], code[2], code[3]));
			if (memcmp(code, kMsgDMouseMove, 4) == 0) {
				mouseMove();
			}

			else if (memcmp(code, kMsgDMouseWheel, 4) == 0) {
				mouseWheel();
			}

			else if (memcmp(code, kMsgDKeyDown, 4) == 0) {
				keyDown();
			}

			else if (memcmp(code, kMsgDKeyUp, 4) == 0) {
				keyUp();
			}

			else if (memcmp(code, kMsgDMouseDown, 4) == 0) {
				mouseDown();
			}

			else if (memcmp(code, kMsgDMouseUp, 4) == 0) {
				mouseUp();
			}

			else if (memcmp(code, kMsgDKeyRepeat, 4) == 0) {
				keyRepeat();
			}

			else if (memcmp(code, kMsgCNoop, 4) == 0) {
				// accept and discard no-op
			}

			else if (memcmp(code, kMsgCEnter, 4) == 0) {
				enter();
			}

			else if (memcmp(code, kMsgCLeave, 4) == 0) {
				leave();
			}

			else if (memcmp(code, kMsgCClipboard, 4) == 0) {
				grabClipboard();
			}

			else if (memcmp(code, kMsgCScreenSaver, 4) == 0) {
				screensaver();
			}

			else if (memcmp(code, kMsgQInfo, 4) == 0) {
				queryInfo();
			}

			else if (memcmp(code, kMsgCInfoAck, 4) == 0) {
				infoAcknowledgment();
			}

			else if (memcmp(code, kMsgDClipboard, 4) == 0) {
				setClipboard();
			}

			else if (memcmp(code, kMsgCClose, 4) == 0) {
				// server wants us to hangup
				log((CLOG_DEBUG1 "recv close"));
				break;
			}

			else if (memcmp(code, kMsgEIncompatible, 4) == 0) {
				SInt32 major, minor;
				CProtocolUtil::readf(getInputStream(),
								kMsgEIncompatible + 4, &major, &minor);
				log((CLOG_ERR "server has incompatible version %d.%d", major, minor));
				failedToConnect = true;
				break;
			}

			else if (memcmp(code, kMsgEBusy, 4) == 0) {
				log((CLOG_ERR "server already has a connected client with name \"%s\"", getName().c_str()));
				failedToConnect = true;
				break;
			}

			else if (memcmp(code, kMsgEUnknown, 4) == 0) {
				log((CLOG_ERR "server refused client with name \"%s\"", getName().c_str()));
				failedToConnect = true;
				break;
			}

			else if (memcmp(code, kMsgEBad, 4) == 0) {
				log((CLOG_ERR "server disconnected due to a protocol error"));
				failedToConnect = true;
				break;
			}

			else {
				// unknown message
				log((CLOG_ERR "unknown message from server"));
				failedToConnect = true;
				break;
			}
		}
	}
	catch (XBase& e) {
		log((CLOG_ERR "error: %s", e.what()));
	}
	catch (...) {
		throw;
	}

	return !failedToConnect;
}

IClient*
CServerProxy::getClient() const
{
	return m_client;
}

CString
CServerProxy::getName() const
{
	return m_client->getName();
}

IInputStream*
CServerProxy::getInputStream() const
{
	return m_input;
}

IOutputStream*
CServerProxy::getOutputStream() const
{
	return m_output;
}

void
CServerProxy::onError()
{
	// ignore
}

void
CServerProxy::onInfoChanged(const CClientInfo& info)
{
	// ignore mouse motion until we receive acknowledgment of our info
	// change message.
	CLock lock(&m_mutex);
	m_ignoreMouse = true;

	// send info update
	sendInfo(info);
}

bool
CServerProxy::onGrabClipboard(ClipboardID id)
{
	log((CLOG_DEBUG1 "sending clipboard %d changed", id));
	CLock lock(&m_mutex);
	CProtocolUtil::writef(getOutputStream(), kMsgCClipboard, id, m_seqNum);
	return true;
}

void
CServerProxy::onClipboardChanged(ClipboardID id, const CString& data)
{
	CLock lock(&m_mutex);
	log((CLOG_DEBUG1 "sending clipboard %d seqnum=%d, size=%d", id, m_seqNum, data.size()));
	CProtocolUtil::writef(getOutputStream(), kMsgDClipboard, id, m_seqNum, &data);
}

void
CServerProxy::flushCompressedMouse()
{
	bool send = false;
	SInt32 x = 0, y = 0;
	{
		CLock lock(&m_mutex);
		if (m_compressMouse) {
			m_compressMouse = false;
			x               = m_xMouse;
			y               = m_yMouse;
			send            = true;
		}
	}

	if (send) {
		getClient()->mouseMove(x, y);
	}
}

void
CServerProxy::sendInfo(const CClientInfo& info)
{
	// note -- m_mutex should be locked on entry
	log((CLOG_DEBUG1 "sending info shape=%d,%d %dx%d zone=%d pos=%d,%d", info.m_x, info.m_y, info.m_w, info.m_h, info.m_zoneSize, info.m_mx, info.m_my));
	CProtocolUtil::writef(getOutputStream(), kMsgDInfo,
								info.m_x, info.m_y,
								info.m_w, info.m_h,
								info.m_zoneSize,
								info.m_mx, info.m_my);
}

void
CServerProxy::enter()
{
	// parse
	SInt16 x, y;
	UInt16 mask;
	UInt32 seqNum;
	CProtocolUtil::readf(getInputStream(),
								kMsgCEnter + 4, &x, &y, &seqNum, &mask);
	log((CLOG_DEBUG1 "recv enter, %d,%d %d %04x", x, y, seqNum, mask));

	// discard old compressed mouse motion, if any
	{
		CLock lock(&m_mutex);
		m_compressMouse = false;
		m_seqNum        = seqNum;
	}

	// forward
	getClient()->enter(x, y, seqNum, static_cast<KeyModifierMask>(mask), false);
}

void
CServerProxy::leave()
{
	// parse
	log((CLOG_DEBUG1 "recv leave"));

	// send last mouse motion
	flushCompressedMouse();

	// forward
	getClient()->leave();
}

void
CServerProxy::setClipboard()
{
	// parse
	ClipboardID id;
	UInt32 seqNum;
	CString data;
	CProtocolUtil::readf(getInputStream(),
								kMsgDClipboard + 4, &id, &seqNum, &data);
	log((CLOG_DEBUG "recv clipboard %d size=%d", id, data.size()));

	// validate
	if (id >= kClipboardEnd) {
		return;
	}

	// forward
	getClient()->setClipboard(id, data);
}

void
CServerProxy::grabClipboard()
{
	// parse
	ClipboardID id;
	UInt32 seqNum;
	CProtocolUtil::readf(getInputStream(), kMsgCClipboard + 4, &id, &seqNum);
	log((CLOG_DEBUG "recv grab clipboard %d", id));

	// validate
	if (id >= kClipboardEnd) {
		return;
	}

	// forward
	getClient()->grabClipboard(id);
}

void
CServerProxy::keyDown()
{
	// get mouse up to date
	flushCompressedMouse();

	// parse
	UInt16 id, mask;
	CProtocolUtil::readf(getInputStream(), kMsgDKeyDown + 4, &id, &mask);
	log((CLOG_DEBUG1 "recv key down id=%d, mask=0x%04x", id, mask));

	// forward
	getClient()->keyDown(static_cast<KeyID>(id),
								static_cast<KeyModifierMask>(mask));
}

void
CServerProxy::keyRepeat()
{
	// get mouse up to date
	flushCompressedMouse();

	// parse
	UInt16 id, mask, count;
	CProtocolUtil::readf(getInputStream(),
								kMsgDKeyRepeat + 4, &id, &mask, &count);
	log((CLOG_DEBUG1 "recv key repeat id=%d, mask=0x%04x, count=%d", id, mask, count));

	// forward
	getClient()->keyRepeat(static_cast<KeyID>(id),
								static_cast<KeyModifierMask>(mask),
								count);
}

void
CServerProxy::keyUp()
{
	// get mouse up to date
	flushCompressedMouse();

	// parse
	UInt16 id, mask;
	CProtocolUtil::readf(getInputStream(), kMsgDKeyUp + 4, &id, &mask);
	log((CLOG_DEBUG1 "recv key up id=%d, mask=0x%04x", id, mask));

	// forward
	getClient()->keyUp(static_cast<KeyID>(id),
								static_cast<KeyModifierMask>(mask));
}

void
CServerProxy::mouseDown()
{
	// get mouse up to date
	flushCompressedMouse();

	// parse
	SInt8 id;
	CProtocolUtil::readf(getInputStream(), kMsgDMouseDown + 4, &id);
	log((CLOG_DEBUG1 "recv mouse down id=%d", id));

	// forward
	getClient()->mouseDown(static_cast<ButtonID>(id));
}

void
CServerProxy::mouseUp()
{
	// get mouse up to date
	flushCompressedMouse();

	// parse
	SInt8 id;
	CProtocolUtil::readf(getInputStream(), kMsgDMouseUp + 4, &id);
	log((CLOG_DEBUG1 "recv mouse up id=%d", id));

	// forward
	getClient()->mouseUp(static_cast<ButtonID>(id));
}

void
CServerProxy::mouseMove()
{
	// parse
	bool ignore;
	SInt16 x, y;
	CProtocolUtil::readf(getInputStream(), kMsgDMouseMove + 4, &x, &y);

	{
		// note if we should ignore the move
		CLock lock(&m_mutex);
		ignore = m_ignoreMouse;

		// compress mouse motion events if more input follows
		if (!ignore && !m_compressMouse && getInputStream()->getSize() > 0) {
			m_compressMouse = true;
		}

		// if compressing then ignore the motion but record it
		if (m_compressMouse) {
			ignore   = true;
			m_xMouse = x;
			m_yMouse = y;
		}
	}
	log((CLOG_DEBUG2 "recv mouse move %d,%d", x, y));

	// forward
	if (!ignore) {
		getClient()->mouseMove(x, y);
	}
}

void
CServerProxy::mouseWheel()
{
	// get mouse up to date
	flushCompressedMouse();

	// parse
	SInt16 delta;
	CProtocolUtil::readf(getInputStream(), kMsgDMouseWheel + 4, &delta);
	log((CLOG_DEBUG2 "recv mouse wheel %+d", delta));

	// forward
	getClient()->mouseWheel(delta);
}

void
CServerProxy::screensaver()
{
	// parse
	SInt8 on;
	CProtocolUtil::readf(getInputStream(), kMsgCScreenSaver + 4, &on);
	log((CLOG_DEBUG1 "recv screen saver on=%d", on));

	// forward
	getClient()->screensaver(on != 0);
}

void
CServerProxy::queryInfo()
{
	// get current info
	CClientInfo info;
	getClient()->getShape(info.m_x, info.m_y, info.m_w, info.m_h);
	getClient()->getCursorPos(info.m_mx, info.m_my);
	info.m_zoneSize = getClient()->getJumpZoneSize();

	// send it
	CLock lock(&m_mutex);
	sendInfo(info);
}

void
CServerProxy::infoAcknowledgment()
{
	// parse
	log((CLOG_DEBUG1 "recv info acknowledgment"));

	// now allow mouse motion
	CLock lock(&m_mutex);
	m_ignoreMouse = false;
}