implemented ipc message buffering (dequeues on gui reconnect)

src/lib/ipc/CIpcClientProxy.cpp

@@ -24,24 +24,54 @@
 #include "CProtocolUtil.h"
 
 CEvent::Type			CIpcClientProxy::s_messageReceivedEvent = CEvent::kUnknown;
+CEvent::Type			CIpcClientProxy::s_disconnectedEvent = CEvent::kUnknown;
 
 CIpcClientProxy::CIpcClientProxy(synergy::IStream& stream) :
 m_stream(stream),
 m_enableLog(false),
-m_clientType(kIpcClientUnknown)
+m_clientType(kIpcClientUnknown),
+m_disconnecting(false)
 {
 	EVENTQUEUE->adoptHandler(
 		m_stream.getInputReadyEvent(), stream.getEventTarget(),
 		new TMethodEventJob<CIpcClientProxy>(
-		this, &CIpcClientProxy::handleData, nullptr));
+		this, &CIpcClientProxy::handleData));
+
+	EVENTQUEUE->adoptHandler(
+		m_stream.getInputShutdownEvent(), stream.getEventTarget(),
+		new TMethodEventJob<CIpcClientProxy>(
+		this, &CIpcClientProxy::handleDisconnect));
+
+	EVENTQUEUE->adoptHandler(
+		m_stream.getOutputShutdownEvent(), stream.getEventTarget(),
+		new TMethodEventJob<CIpcClientProxy>(
+		this, &CIpcClientProxy::handleWriteError));
 }
 
 CIpcClientProxy::~CIpcClientProxy()
 {
 	EVENTQUEUE->removeHandler(
 		m_stream.getInputReadyEvent(), m_stream.getEventTarget());
+	EVENTQUEUE->removeHandler(
+		m_stream.getInputShutdownEvent(), m_stream.getEventTarget());
+	EVENTQUEUE->removeHandler(
+		m_stream.getOutputShutdownEvent(), m_stream.getEventTarget());
 
-	m_stream.close();
+	delete &m_stream;
+}
+
+void
+CIpcClientProxy::handleDisconnect(const CEvent&, void*)
+{
+	disconnect();
+	LOG((CLOG_DEBUG "ipc client disconnected"));
+}
+
+void
+CIpcClientProxy::handleWriteError(const CEvent&, void*)
+{
+	disconnect();
+	LOG((CLOG_DEBUG "ipc client write error"));
 }
 
 void
@@ -54,6 +84,7 @@ CIpcClientProxy::handleData(const CEvent&, void*)
 
 		CIpcMessage* m = new CIpcMessage();
 		m->m_type = type;
+		m->m_source = this;
 
 		if (m_enableLog) {
 			LOG((CLOG_DEBUG "ipc client proxy read: %d", code[0]));
@@ -140,10 +171,8 @@ CIpcClientProxy::parseCommand()
 void
 CIpcClientProxy::disconnect()
 {
-	if (m_enableLog) {
+	m_disconnecting = true;
-		LOG((CLOG_NOTE "disconnect, closing stream"));
+	EVENTQUEUE->addEvent(CEvent(getDisconnectedEvent(), this));
-	}
-	m_stream.close();
 }
 
 CEvent::Type
@@ -152,3 +181,10 @@ CIpcClientProxy::getMessageReceivedEvent()
 	return EVENTQUEUE->registerTypeOnce(
 		s_messageReceivedEvent, "CIpcClientProxy::messageReceived");
 }
+
+CEvent::Type
+CIpcClientProxy::getDisconnectedEvent()
+{
+	return EVENTQUEUE->registerTypeOnce(
+		s_disconnectedEvent, "CIpcClientProxy::disconnected");
+}

src/lib/ipc/CIpcClientProxy.h

@@ -34,8 +34,13 @@ public:
 	//! Raised when the server receives a message from a client.
 	static CEvent::Type	getMessageReceivedEvent();
 
+	//! Raised when the client disconnects from the server.
+	static CEvent::Type	getDisconnectedEvent();
+
 private:
 	void				handleData(const CEvent&, void*);
+	void				handleDisconnect(const CEvent&, void*);
+	void				handleWriteError(const CEvent&, void*);
 	void				parseHello();
 	void*				parseCommand();
 	void				disconnect();
@@ -44,7 +49,9 @@ public:
 	synergy::IStream&	m_stream;
 	bool				m_enableLog;
 	EIpcClientType		m_clientType;
+	bool				m_disconnecting;
 	
 private:
 	static CEvent::Type	s_messageReceivedEvent;
+	static CEvent::Type	s_disconnectedEvent;
 };

src/lib/ipc/CIpcLogOutputter.cpp

@@ -19,6 +19,10 @@
 #include "CIpcServer.h"
 #include "CIpcMessage.h"
 #include "Ipc.h"
+#include "CEvent.h"
+#include "CEventQueue.h"
+#include "TMethodEventJob.h"
+#include "CIpcClientProxy.h"
 
 CIpcLogOutputter::CIpcLogOutputter(CIpcServer& ipcServer) :
 m_ipcServer(ipcServer)
@@ -29,6 +33,20 @@ CIpcLogOutputter::~CIpcLogOutputter()
 {
 }
 
+void
+CIpcLogOutputter::sendBuffer(CIpcClientProxy& proxy)
+{
+	while (m_buffer.size() != 0) {
+		CString text = m_buffer.front();
+		m_buffer.pop();
+		
+		CIpcMessage message;
+		message.m_type = kIpcLogLine;
+		message.m_data = new CString(text);
+		proxy.send(message);
+	}
+}
+
 void
 CIpcLogOutputter::open(const char* title)
 {
@@ -45,11 +63,17 @@ CIpcLogOutputter::show(bool showIfEmpty)
 }
 
 bool
-CIpcLogOutputter::write(ELevel level, const char* msg)
+CIpcLogOutputter::write(ELevel level, const char* text)
 {
+	if (m_ipcServer.hasClients(kIpcClientGui)) {
 		CIpcMessage message;
 		message.m_type = kIpcLogLine;
-	message.m_data = new CString(msg);
+		message.m_data = new CString(text);
 		m_ipcServer.send(message, kIpcClientGui);
+	}
+	else {
+		m_buffer.push(text);
+	}
+	
 	return true;
 }

src/lib/ipc/CIpcLogOutputter.h

@@ -18,8 +18,11 @@
 #pragma once
 
 #include "ILogOutputter.h"
+#include <queue>
 
 class CIpcServer;
+class CEvent;
+class CIpcClientProxy;
 
 //! Write log to GUI over IPC
 /*!
@@ -36,6 +39,12 @@ public:
 	virtual void		show(bool showIfEmpty);
 	virtual bool		write(ELevel level, const char* message);
 
+	//! Sends messages queued while no clients were connected.
+	void				sendBuffer(CIpcClientProxy& proxy);
+
 private:
+	typedef std::queue<CString> CIpcLogQueue;
+
 	CIpcServer&			m_ipcServer;
+	CIpcLogQueue		m_buffer;
 };

src/lib/ipc/CIpcMessage.cpp

@@ -19,7 +19,8 @@
 
 CIpcMessage::CIpcMessage() :
 m_type(0),
-m_data(nullptr)
+m_data(nullptr),
+m_source(nullptr)
 {
 }
 

src/lib/ipc/CIpcMessage.h

@@ -26,4 +26,5 @@ public:
 
 	UInt8				m_type;
 	void*				m_data;
+	void*				m_source;
 };

src/lib/ipc/CIpcServer.cpp

@@ -34,7 +34,7 @@ m_address(CNetworkAddress(IPC_HOST, IPC_PORT))
 	m_address.resolve();
 
 	EVENTQUEUE->adoptHandler(
-		m_socket.getConnectingEvent(), &m_socket,
+		IListenSocket::getConnectingEvent(), &m_socket,
 		new TMethodEventJob<CIpcServer>(
 		this, &CIpcServer::handleClientConnecting));
 }
@@ -65,12 +65,50 @@ CIpcServer::handleClientConnecting(const CEvent&, void*)
 	}
 
 	LOG((CLOG_DEBUG "accepted ipc client connection"));
-
-	// TODO: delete on disconnect
 	CIpcClientProxy* proxy = new CIpcClientProxy(*stream);
 	m_clients.insert(proxy);
 
-	EVENTQUEUE->addEvent(CEvent(getClientConnectedEvent(), this, proxy, CEvent::kDontFreeData));
+	EVENTQUEUE->adoptHandler(
+		CIpcClientProxy::getDisconnectedEvent(), proxy,
+		new TMethodEventJob<CIpcServer>(
+		this, &CIpcServer::handleClientDisconnected));
+
+	EVENTQUEUE->addEvent(CEvent(
+		getClientConnectedEvent(), this, proxy, CEvent::kDontFreeData));
+}
+
+void
+CIpcServer::handleClientDisconnected(const CEvent& e, void*)
+{
+	CIpcClientProxy* proxy = static_cast<CIpcClientProxy*>(e.getTarget());
+
+	EVENTQUEUE->removeHandler(
+		CIpcClientProxy::getDisconnectedEvent(), proxy);
+
+	CClientSet::iterator& it = m_clients.find(proxy);
+	delete proxy;
+	m_clients.erase(it);
+	LOG((CLOG_DEBUG "ipc client proxy removed, connected=%d", m_clients.size()));
+}
+
+bool
+CIpcServer::hasClients(EIpcClientType clientType) const
+{
+	if (m_clients.size() == 0) {
+		return false;
+	}
+
+	CClientSet::iterator it;
+	for (it = m_clients.begin(); it != m_clients.end(); it++) {
+		// at least one client is alive and type matches, there are clients.
+		CIpcClientProxy* p = *it;
+		if (!p->m_disconnecting && p->m_clientType == clientType) {
+			return true;
+		}
+	}
+
+	// all clients must be disconnecting, no active clients.
+	return false;
 }
 
 CEvent::Type

src/lib/ipc/CIpcServer.h

@@ -51,6 +51,9 @@ public:
 	//! @name accessors
 	//@{
 
+	//! Returns true when there are clients of the specified type connected.
+	bool				hasClients(EIpcClientType clientType) const;
+
 	//! Raised when we have created the client proxy.
 	static CEvent::Type	getClientConnectedEvent();
 
@@ -58,6 +61,8 @@ public:
 
 private:
 	void				handleClientConnecting(const CEvent&, void*);
+	void				handleClientDisconnected(const CEvent&, void*);
+	void				handleClientMessage(const CEvent&, void*);
 
 private:
 	typedef std::set<CIpcClientProxy*> CClientSet;

src/lib/platform/CMSWindowsRelauncher.cpp

@@ -288,7 +288,10 @@ CMSWindowsRelauncher::mainLoop(void*)
 
 				std::string cmd = command();
 				if (cmd == "") {
-					LOG((CLOG_WARN "nothing to launch, no command specified."));
+					// this appears on first launch when the user hasn't configured
+					// anything yet, so don't show it as a warning, only show it as
+					// debug to devs to let them know why nothing happened.
+					LOG((CLOG_DEBUG "nothing to launch, no command specified."));
 					continue;
 				}
 

src/lib/synergy/CDaemonApp.cpp

@@ -310,7 +310,19 @@ CDaemonApp::handleIpcMessage(const CEvent& e, void*)
 			// relauncher to stop the existing command and start the new
 			// command.
 			m_relauncher->command(command);
+			break;
+		}
+
+		case kIpcHello: {
+			if (m.m_source != nullptr) {
+				CIpcClientProxy& proxy = *static_cast<CIpcClientProxy*>(m.m_source);
+				if (proxy.m_clientType == kIpcClientGui) {
+					// when a new gui client connects, send them all the
+					// log messages queued up while they were gone.
+					m_ipcLogOutputter->sendBuffer(proxy);
+				}
 			}
 			break;
 		}
 	}
+}