/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program 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 3 of the License, or
(at your option) any later version.

This program 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/>.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/PubUtilLib/plNetGateKeeperLib/Private/plNglGateKeeper.cpp
*   
***/

#include "../Pch.h"
#pragma hdrstop

// This file excluded from pre-compiled header because it is auto-generated by the build server.
#include "pnNetBase/pnNbGateKeeperKey.hpp"

namespace Ngl { namespace GateKeeper {

/*****************************************************************************
*
*   Private
*
***/
	
struct CliGkConn : AtomicRef {
    CliGkConn ();
    ~CliGkConn ();

	// Reconnection
	AsyncTimer *		reconnectTimer;
	unsigned			reconnectStartMs;
	
	// Ping
	AsyncTimer *		pingTimer;
	unsigned			pingSendTimeMs;
	unsigned			lastHeardTimeMs;

	// This function should be called during object construction
	// to initiate connection attempts to the remote host whenever
	// the socket is disconnected.
	void AutoReconnect ();
	bool AutoReconnectEnabled ();
	void StopAutoReconnect (); // call before destruction
	void StartAutoReconnect ();
	void TimerReconnect ();
	
	// ping
	void AutoPing ();
	void StopAutoPing ();
	void TimerPing ();
	
	void Send (const unsigned_ptr fields[], unsigned count);

	CCritSect		critsect;
    LINK(CliGkConn) link;
    AsyncSocket     sock;
    NetCli *        cli;
    wchar           name[MAX_PATH];
    NetAddress      addr;
    Uuid			token;
    unsigned        seq;
    unsigned        serverChallenge;
    AsyncCancelId	cancelId;
    bool			abandoned;
};


//============================================================================
// PingRequestTrans
//============================================================================
struct PingRequestTrans : NetGateKeeperTrans {
	FNetCliGateKeeperPingRequestCallback	m_callback;
	void *									m_param;
	unsigned								m_pingAtMs;
	unsigned								m_replyAtMs;
	ARRAY(byte)								m_payload;
	
	PingRequestTrans (
		FNetCliGateKeeperPingRequestCallback	callback,
		void *									param,
		unsigned								pingAtMs,
		unsigned								payloadBytes,
		const void *							payload
	);

    bool Send ();
    void Post ();
    bool Recv (
        const byte  msg[],
        unsigned    bytes
    );
};

//============================================================================
// FileSrvIpAddressRequestTrans
//============================================================================
struct FileSrvIpAddressRequestTrans : NetGateKeeperTrans {
	FNetCliGateKeeperFileSrvIpAddressRequestCallback	m_callback;
	void *												m_param;
	wchar												m_addr[64];
	bool												m_isPatcher;
	
	FileSrvIpAddressRequestTrans (
		FNetCliGateKeeperFileSrvIpAddressRequestCallback	callback,
		void *												param,
		bool												isPatcher
	);

    bool Send ();
    void Post ();
    bool Recv (
        const byte  msg[],
        unsigned    bytes
    );
};

//============================================================================
// AuthSrvIpAddressRequestTrans
//============================================================================
struct AuthSrvIpAddressRequestTrans : NetGateKeeperTrans {
	FNetCliGateKeeperAuthSrvIpAddressRequestCallback	m_callback;
	void *												m_param;
	wchar												m_addr[64];
	
	AuthSrvIpAddressRequestTrans (
		FNetCliGateKeeperAuthSrvIpAddressRequestCallback	callback,
		void *												param
	);

    bool Send ();
    void Post ();
    bool Recv (
        const byte  msg[],
        unsigned    bytes
    );
};


/*****************************************************************************
*
*   Private data
*
***/

enum {
    kPerfConnCount,
    kPingDisabled,
    kAutoReconnectDisabled,
    kNumPerf
};

static bool                         s_running;
static CCritSect                    s_critsect;
static LISTDECL(CliGkConn, link)    s_conns;
static CliGkConn *                  s_active;

static long                         s_perf[kNumPerf];



/*****************************************************************************
*
*   Internal functions
*
***/

//===========================================================================
static unsigned GetNonZeroTimeMs () {
	if (unsigned ms = TimeGetMs())
		return ms;
	return 1;
}

//============================================================================
static CliGkConn * GetConnIncRef_CS (const char tag[]) {
    if (CliGkConn * conn = s_active) {
        conn->IncRef(tag);
        return conn;
    }
    return nil;
}

//============================================================================
static CliGkConn * GetConnIncRef (const char tag[]) {
    CliGkConn * conn;
    s_critsect.Enter();
    {
        conn = GetConnIncRef_CS(tag);
    }
    s_critsect.Leave();
    return conn;
}

//============================================================================
static void UnlinkAndAbandonConn_CS (CliGkConn * conn) {
	s_conns.Unlink(conn);
	conn->abandoned = true;

	conn->StopAutoReconnect();

	if (conn->cancelId) {
		AsyncSocketConnectCancel(nil, conn->cancelId);
		conn->cancelId  = 0;
	}
	else if (conn->sock) {
		AsyncSocketDisconnect(conn->sock, true);
	}
	else {
		conn->DecRef("Lifetime");
	}
}

//============================================================================
static void SendClientRegisterRequest (CliGkConn * conn) {
/*    const unsigned_ptr msg[] = {
        kCli2GateKeeper_ClientRegisterRequest,
        BuildId(),
    };

	conn->Send(msg, arrsize(msg));*/
}

//============================================================================
static bool ConnEncrypt (ENetError error, void * param) {
    CliGkConn * conn = (CliGkConn *) param;
        
	if (IS_NET_SUCCESS(error)) {

        //SendClientRegisterRequest(conn);

        if (!s_perf[kPingDisabled])
			conn->AutoPing();

		s_critsect.Enter();
        {
            SWAP(s_active, conn);
        }
        s_critsect.Leave();
			
	//	AuthConnectedNotifyTrans * trans = NEW(AuthConnectedNotifyTrans);
	//	NetTransSend(trans);
	}

    return IS_NET_SUCCESS(error);
}

//============================================================================
static void NotifyConnSocketConnect (CliGkConn * conn) {

	conn->TransferRef("Connecting", "Connected");
	conn->cli = NetCliConnectAccept(
		conn->sock,
		kNetProtocolCli2GateKeeper,
		false,
		ConnEncrypt,
		0,
		nil,
		conn
	);
}

//============================================================================
static void CheckedReconnect (CliGkConn * conn, ENetError error) {

	unsigned disconnectedMs = GetNonZeroTimeMs() - conn->lastHeardTimeMs;

	// no auto-reconnect or haven't heard from the server in a while?
	if (!conn->AutoReconnectEnabled() || (int)disconnectedMs >= (int)kDisconnectedTimeoutMs) {
		// Cancel all transactions in progress on this connection.
		NetTransCancelByConnId(conn->seq, kNetErrTimeout);
		// conn is dead.
		conn->DecRef("Lifetime");
		ReportNetError(kNetProtocolCli2GateKeeper, error);
	}
	else {
		if (conn->token != kNilGuid)
			// previously encrypted; reconnect quickly
			conn->reconnectStartMs = GetNonZeroTimeMs() + 500;
		else
			// never encrypted; reconnect slowly
			conn->reconnectStartMs = GetNonZeroTimeMs() + kMaxReconnectIntervalMs;

		// clean up the socket and start reconnect
		if (conn->cli)
			NetCliDelete(conn->cli, true);
		conn->cli = nil;
		conn->sock = nil;
		
		conn->StartAutoReconnect();
	}
}

//============================================================================
static void NotifyConnSocketConnectFailed (CliGkConn * conn) {

    s_critsect.Enter();
    {
		conn->cancelId = 0;
        s_conns.Unlink(conn);

        if (conn == s_active)
            s_active = nil;
    }
    s_critsect.Leave();
    
    CheckedReconnect(conn, kNetErrConnectFailed);
    
	conn->DecRef("Connecting");
}

//============================================================================
static void NotifyConnSocketDisconnect (CliGkConn * conn) {

	conn->StopAutoPing();

    s_critsect.Enter();
    {
		conn->cancelId = 0;
        s_conns.Unlink(conn);
			
        if (conn == s_active)
            s_active = nil;
    }
    s_critsect.Leave();

    // Cancel all transactions in process on this connection.
    NetTransCancelByConnId(conn->seq, kNetErrTimeout);
    conn->DecRef("Connected");
    conn->DecRef("Lifetime");
}

//============================================================================
static bool NotifyConnSocketRead (CliGkConn * conn, AsyncNotifySocketRead * read) {
    // TODO: Only dispatch messages from the active auth server
    conn->lastHeardTimeMs = GetNonZeroTimeMs();
    bool result = NetCliDispatch(conn->cli, read->buffer, read->bytes, conn);
    read->bytesProcessed += read->bytes;
    return result;
}

//============================================================================
static bool SocketNotifyCallback (
    AsyncSocket         sock,
    EAsyncNotifySocket  code,
    AsyncNotifySocket * notify,
    void **             userState
) {
    bool result = true;
    CliGkConn * conn;

    switch (code) {
        case kNotifySocketConnectSuccess:
            conn = (CliGkConn *) notify->param;
            *userState = conn;
            bool abandoned;
            s_critsect.Enter();
            {
				conn->sock		= sock;
				conn->cancelId	= 0;
				abandoned		= conn->abandoned;
            }
            s_critsect.Leave();
            if (abandoned)
				AsyncSocketDisconnect(sock, true);
			else
				NotifyConnSocketConnect(conn);
        break;

        case kNotifySocketConnectFailed:
            conn = (CliGkConn *) notify->param;
            NotifyConnSocketConnectFailed(conn);
        break;

        case kNotifySocketDisconnect:
            conn = (CliGkConn *) *userState;
            NotifyConnSocketDisconnect(conn);
        break;

        case kNotifySocketRead:
            conn = (CliGkConn *) *userState;
            result = NotifyConnSocketRead(conn, (AsyncNotifySocketRead *) notify);
        break;
    }
    
    return result;
}

//============================================================================
static void Connect (
	CliGkConn *	conn
) {
	ASSERT(s_running);

    conn->pingSendTimeMs = 0;

    s_critsect.Enter();
    {
		while (CliGkConn * oldConn = s_conns.Head()) {
			if (oldConn != conn)
				UnlinkAndAbandonConn_CS(oldConn);
			else
				s_conns.Unlink(oldConn);
		}
        s_conns.Link(conn);
    }
    s_critsect.Leave();
    
    Cli2GateKeeper_Connect connect;
    connect.hdr.connType		= kConnTypeCliToGateKeeper;
    connect.hdr.hdrBytes		= sizeof(connect.hdr);
    connect.hdr.buildId			= BuildId();
    connect.hdr.buildType		= BuildType();
    connect.hdr.branchId		= BranchId();
    connect.hdr.productId		= ProductId();
    connect.data.token			= conn->token;
    connect.data.dataBytes		= sizeof(connect.data);

    AsyncSocketConnect(
        &conn->cancelId,
        conn->addr,
        SocketNotifyCallback,
        conn,
        &connect,
        sizeof(connect),
        0,
        0
    );
}

//============================================================================
static void Connect (
    const wchar         name[],
    const NetAddress &  addr
) {
	ASSERT(s_running);
	
    CliGkConn * conn		= NEWZERO(CliGkConn);
    conn->addr				= addr;
    conn->seq				= ConnNextSequence();
    conn->lastHeardTimeMs	= GetNonZeroTimeMs();	// used in connect timeout, and ping timeout
    StrCopy(conn->name, name, arrsize(conn->name));

    conn->IncRef("Lifetime");
	conn->AutoReconnect();
}

//============================================================================
static void AsyncLookupCallback (
    void *              param,
    const wchar         name[],
    unsigned            addrCount,
    const NetAddress    addrs[]
) {
    ref(param);
    
    if (!addrCount) {
		ReportNetError(kNetProtocolCli2GateKeeper, kNetErrNameLookupFailed);
		return;
	}

    for (unsigned i = 0; i < addrCount; ++i) {
        Connect(name, addrs[i]);
    }
}




/*****************************************************************************
*
*   CliGkConn
*
***/

//===========================================================================
static unsigned CliGkConnTimerDestroyed (void * param) {
	CliGkConn * conn = (CliGkConn *) param;
	conn->DecRef("TimerDestroyed");
	return kAsyncTimeInfinite;
}

//===========================================================================
static unsigned CliGkConnReconnectTimerProc (void * param) {
	((CliGkConn *) param)->TimerReconnect();
	return kAsyncTimeInfinite;
}

//===========================================================================
static unsigned CliGkConnPingTimerProc (void * param) {
	((CliGkConn *) param)->TimerPing();
	return kPingIntervalMs;
}

//============================================================================
CliGkConn::CliGkConn () {
    AtomicAdd(&s_perf[kPerfConnCount], 1);
}

//============================================================================
CliGkConn::~CliGkConn () {
    if (cli)
        NetCliDelete(cli, true);
    AtomicAdd(&s_perf[kPerfConnCount], -1);
}

//===========================================================================
void CliGkConn::TimerReconnect () {
	ASSERT(!sock);
	ASSERT(!cancelId);
	
	if (!s_running) {
		s_critsect.Enter();
		UnlinkAndAbandonConn_CS(this);
		s_critsect.Leave();
	}
	else {
		IncRef("Connecting");

		// Remember the time we started the reconnect attempt, guarding against
		// TimeGetMs() returning zero (unlikely), as a value of zero indicates
		// a first-time connect condition to StartAutoReconnect()
		reconnectStartMs = GetNonZeroTimeMs();

		Connect(this);
	}
}

//===========================================================================
// This function is called when after a disconnect to start a new connection
void CliGkConn::StartAutoReconnect () {
	critsect.Enter();
	if (reconnectTimer && !s_perf[kAutoReconnectDisabled]) {
		// Make reconnect attempts at regular intervals. If the last attempt
		// took more than the specified max interval time then reconnect
		// immediately; otherwise wait until the time interval is up again
		// then reconnect.
		unsigned remainingMs = 0;
		if (reconnectStartMs) {
			remainingMs = reconnectStartMs - GetNonZeroTimeMs();
			if ((signed)remainingMs < 0)
				remainingMs = 0;
			LogMsg(kLogPerf, L"GateKeeper auto-reconnecting in %u ms", remainingMs);
		}
		AsyncTimerUpdate(reconnectTimer, remainingMs);
	}
	critsect.Leave();
}

//===========================================================================
// This function should be called during object construction
// to initiate connection attempts to the remote host whenever
// the socket is disconnected.
void CliGkConn::AutoReconnect () {
		
	ASSERT(!reconnectTimer);
	IncRef("ReconnectTimer");
	critsect.Enter();
	{
		AsyncTimerCreate(
			&reconnectTimer,
			CliGkConnReconnectTimerProc,
			0,  // immediate callback
			this
		);
	}
	critsect.Leave();
}

//============================================================================
void CliGkConn::StopAutoReconnect () {
	critsect.Enter();
	{
		if (AsyncTimer * timer = reconnectTimer) {
			reconnectTimer = nil;
			AsyncTimerDeleteCallback(timer, CliGkConnTimerDestroyed);
		}
	}
	critsect.Leave();
}

//============================================================================
bool CliGkConn::AutoReconnectEnabled () {
	
	return (reconnectTimer != nil) && !s_perf[kAutoReconnectDisabled];
}

//============================================================================
void CliGkConn::AutoPing () {
	ASSERT(!pingTimer);
	IncRef("PingTimer");
	critsect.Enter();
	{
		AsyncTimerCreate(
			&pingTimer,
			CliGkConnPingTimerProc,
			sock ? 0 : kAsyncTimeInfinite,
			this
		);
	}
	critsect.Leave();
}

//============================================================================
void CliGkConn::StopAutoPing () {
	critsect.Enter();
	{
		if (AsyncTimer * timer = pingTimer) {
			pingTimer = nil;
			AsyncTimerDeleteCallback(timer, CliGkConnTimerDestroyed);
		}
	}
	critsect.Leave();
}

//============================================================================
void CliGkConn::TimerPing () {

#if 0
	// if the time difference between when we last sent a ping and when we last
	// heard from the server is >= 3x the ping interval, the socket is stale.
	if (pingSendTimeMs && abs(int(pingSendTimeMs - lastHeardTimeMs)) >= kPingTimeoutMs) {
		// ping timed out, disconnect the socket
		AsyncSocketDisconnect(sock, true);
	}
	else
#endif
	{
		// Send a ping request
		pingSendTimeMs = GetNonZeroTimeMs();
		
		const unsigned_ptr msg[] = {
			kCli2GateKeeper_PingRequest,
			pingSendTimeMs,
			0,		// not a transaction
			0,		// no payload
			nil
		};
		
		//Send(msg, arrsize(msg));
	}		
}

//============================================================================
void CliGkConn::Send (const unsigned_ptr fields[], unsigned count) {
	critsect.Enter();
	{
		NetCliSend(cli, fields, count);
		NetCliFlush(cli);
	}
	critsect.Leave();
}


/*****************************************************************************
*
*   Cli2GateKeeper message handlers
*
***/

//============================================================================
static bool Recv_PingReply (
    const byte      msg[],
    unsigned        bytes,
    void *
) {
    const GateKeeper2Cli_PingReply & reply = *(const GateKeeper2Cli_PingReply *)msg;

	if (reply.transId)
		NetTransRecv(reply.transId, msg, bytes);

    return true;
}


//============================================================================
static bool Recv_FileSrvIpAddressReply (
    const byte      msg[],
    unsigned        bytes,
    void *
) {
    const GateKeeper2Cli_FileSrvIpAddressReply & reply = *(const GateKeeper2Cli_FileSrvIpAddressReply *)msg;

	if (reply.transId)
		NetTransRecv(reply.transId, msg, bytes);

    return true;
}

//============================================================================
static bool Recv_AuthSrvIpAddressReply (
    const byte      msg[],
    unsigned        bytes,
    void *
) {
    const GateKeeper2Cli_AuthSrvIpAddressReply & reply = *(const GateKeeper2Cli_AuthSrvIpAddressReply *)msg;

	if (reply.transId)
		NetTransRecv(reply.transId, msg, bytes);

    return true;
}


/*****************************************************************************
*
*   Cli2Auth protocol
*
***/

#define MSG(s)  kNetMsg_Cli2GateKeeper_##s
static NetMsgInitSend s_send[] = {
    { MSG(PingRequest)              },
	{ MSG(FileSrvIpAddressRequest)  },
	{ MSG(AuthSrvIpAddressRequest)	},
};
#undef MSG

#define MSG(s)  kNetMsg_GateKeeper2Cli_##s, Recv_##s
static NetMsgInitRecv s_recv[] = {
    { MSG(PingReply)                },
	{ MSG(FileSrvIpAddressReply)	},
};
#undef MSG


/*****************************************************************************
*
*   PingRequestTrans
*
***/

//============================================================================
PingRequestTrans::PingRequestTrans (
	FNetCliGateKeeperPingRequestCallback	callback,
	void *							param,
	unsigned						pingAtMs,
	unsigned						payloadBytes,
	const void *					payload
) :	NetGateKeeperTrans(kPingRequestTrans)
,	m_callback(callback)
,	m_param(param)
,	m_pingAtMs(pingAtMs)
{
	m_payload.Set((const byte *)payload, payloadBytes);
}

//============================================================================
bool PingRequestTrans::Send () {

    if (!AcquireConn())
        return false;

	const unsigned_ptr msg[] = {
		kCli2GateKeeper_PingRequest,
						m_pingAtMs,
						m_transId,
						m_payload.Count(),
		(unsigned_ptr)	m_payload.Ptr(),
	};
	
	m_conn->Send(msg, arrsize(msg));
    
    return true;
}

//============================================================================
void PingRequestTrans::Post () {

	m_callback(
		m_result,
		m_param,
		m_pingAtMs,
		m_replyAtMs,
		m_payload.Count(),
		m_payload.Ptr()
	);
}

//============================================================================
bool PingRequestTrans::Recv (
    const byte  msg[],
    unsigned    bytes
) {
	ref(bytes);
	
	const GateKeeper2Cli_PingReply & reply = *(const GateKeeper2Cli_PingReply *)msg;

	m_payload.Set(reply.payload, reply.payloadBytes);
    m_replyAtMs		= TimeGetMs();
    m_result        = kNetSuccess;
    m_state         = kTransStateComplete;

	return true;
}


/*****************************************************************************
*
*   FileSrvIpAddressRequestTrans
*
***/

//============================================================================
FileSrvIpAddressRequestTrans::FileSrvIpAddressRequestTrans (
	FNetCliGateKeeperFileSrvIpAddressRequestCallback	callback,
	void *												param,
	bool												isPatcher
) :	NetGateKeeperTrans(kGkFileSrvIpAddressRequestTrans)
,	m_callback(callback)
,	m_param(param)
,	m_isPatcher(isPatcher)
{
}

//============================================================================
bool FileSrvIpAddressRequestTrans::Send () {

    if (!AcquireConn())
        return false;

	
	const unsigned_ptr msg[] = {
		kCli2GateKeeper_FileSrvIpAddressRequest,
						m_transId,
						m_isPatcher == true ? 1 : 0
	};
	
	m_conn->Send(msg, arrsize(msg));
    
    return true;
}

//============================================================================
void FileSrvIpAddressRequestTrans::Post () {

	m_callback(
		m_result,
		m_param,
		m_addr
	);
}

//============================================================================
bool FileSrvIpAddressRequestTrans::Recv (
    const byte  msg[],
    unsigned    bytes
) {
	ref(bytes);
	
	const GateKeeper2Cli_FileSrvIpAddressReply & reply = *(const GateKeeper2Cli_FileSrvIpAddressReply *)msg;

	
    m_result        = kNetSuccess;
    m_state         = kTransStateComplete;
	StrCopy(m_addr, reply.address, 64);

	return true;
}


/*****************************************************************************
*
*   AuthSrvIpAddressRequestTrans
*
***/

//============================================================================
AuthSrvIpAddressRequestTrans::AuthSrvIpAddressRequestTrans (
	FNetCliGateKeeperFileSrvIpAddressRequestCallback	callback,
	void *												param
) :	NetGateKeeperTrans(kGkAuthSrvIpAddressRequestTrans)
,	m_callback(callback)
,	m_param(param)
{
}

//============================================================================
bool AuthSrvIpAddressRequestTrans::Send () {

    if (!AcquireConn())
        return false;

	const unsigned_ptr msg[] = {
		kCli2GateKeeper_AuthSrvIpAddressRequest,
						m_transId,
	};
	
	m_conn->Send(msg, arrsize(msg));
    
    return true;
}

//============================================================================
void AuthSrvIpAddressRequestTrans::Post () {

	m_callback(
		m_result,
		m_param,
		m_addr
	);
}

//============================================================================
bool AuthSrvIpAddressRequestTrans::Recv (
    const byte  msg[],
    unsigned    bytes
) {
	ref(bytes);
	
	const GateKeeper2Cli_AuthSrvIpAddressReply & reply = *(const GateKeeper2Cli_AuthSrvIpAddressReply *)msg;

    m_result        = kNetSuccess;
    m_state         = kTransStateComplete;
	StrCopy(m_addr, reply.address, 64);

	return true;
}


}	using namespace GateKeeper;


/*****************************************************************************
*
*   NetGateKeeperTrans
*
***/

//============================================================================
NetGateKeeperTrans::NetGateKeeperTrans (ETransType transType)
:   NetTrans(kNetProtocolCli2GateKeeper, transType)
,   m_conn(nil)
{
}

//============================================================================
NetGateKeeperTrans::~NetGateKeeperTrans () {
    ReleaseConn();
}

//============================================================================
bool NetGateKeeperTrans::AcquireConn () {
    if (!m_conn)
        m_conn = GetConnIncRef("AcquireConn");
    return m_conn != nil;
}

//============================================================================
void NetGateKeeperTrans::ReleaseConn () {
    if (m_conn) {
        m_conn->DecRef("AcquireConn");
        m_conn = nil;
    }
}


/*****************************************************************************
*
*   Protected functions
*
***/

//============================================================================
void GateKeeperInitialize () {
	s_running = true;
	NetMsgProtocolRegister(
		kNetProtocolCli2GateKeeper,
		false,
		s_send, arrsize(s_send),
		s_recv, arrsize(s_recv),
		kDhGValue,
		BigNum(sizeof(kDhXData), kDhXData),
		BigNum(sizeof(kDhNData), kDhNData)
    );
}

//============================================================================
void GateKeeperDestroy (bool wait) {
	s_running = false;

	NetTransCancelByProtocol(
		kNetProtocolCli2GateKeeper,
		kNetErrRemoteShutdown
	);    
    NetMsgProtocolDestroy(
        kNetProtocolCli2GateKeeper,
        false
    );

    s_critsect.Enter();
    {
		while (CliGkConn * conn = s_conns.Head())
			UnlinkAndAbandonConn_CS(conn);
		s_active = nil;
	}
    s_critsect.Leave();

	if (!wait)
		return;

	while (s_perf[kPerfConnCount]) {
		NetTransUpdate();
        AsyncSleep(10);
	}
}

//============================================================================
bool GateKeeperQueryConnected () {

	bool result;
	s_critsect.Enter();
	{
		if (nil != (result = s_active))
			result &= (nil != s_active->cli);
	}
	s_critsect.Leave();
	return result;
}

//============================================================================
unsigned GateKeeperGetConnId () {
    unsigned connId;
    s_critsect.Enter();
    connId = (s_active) ? s_active->seq : 0;
    s_critsect.Leave();
    return connId;
}


}	using namespace Ngl;


/*****************************************************************************
*
*   Exported functions
*
***/

//============================================================================
void NetCliGateKeeperStartConnect (
    const wchar *   gateKeeperAddrList[],
    unsigned        gateKeeperAddrCount
) {
    gateKeeperAddrCount = min(gateKeeperAddrCount, 1);

    for (unsigned i = 0; i < gateKeeperAddrCount; ++i) {
        // Do we need to lookup the address?
        const wchar * name = gateKeeperAddrList[i];
        while (unsigned ch = *name) {
            ++name;
			if (!(isdigit(ch) || ch == L'.' || ch == L':')) {
                AsyncCancelId cancelId;
                AsyncAddressLookupName(
                    &cancelId,
                    AsyncLookupCallback,
                    gateKeeperAddrList[i],
                    kNetDefaultClientPort,
                    nil
                );
                break;
            }
        }
        if (!name[0]) {
            NetAddress addr;
            NetAddressFromString(&addr, gateKeeperAddrList[i], kNetDefaultClientPort);
            Connect(gateKeeperAddrList[i], addr);
        }
    }
}

//============================================================================
void NetCliGateKeeperDisconnect () {
    s_critsect.Enter();
    {
		while (CliGkConn * conn = s_conns.Head())
			UnlinkAndAbandonConn_CS(conn);
		s_active = nil;
    }
    s_critsect.Leave();
}

//============================================================================
void NetCliGateKeeperPingRequest (
    unsigned								pingTimeMs,
    unsigned								payloadBytes,
    const void *							payload,
    FNetCliGateKeeperPingRequestCallback	callback,
    void *									param
) {
	PingRequestTrans * trans = NEW(PingRequestTrans)(
		callback,
		param,
		pingTimeMs, 
		payloadBytes,
		payload
	);
	NetTransSend(trans);
}

//============================================================================
void NetCliGateKeeperFileSrvIpAddressRequest (
	FNetCliGateKeeperFileSrvIpAddressRequestCallback	callback,
	void *												param,
	bool												isPatcher
) {
	FileSrvIpAddressRequestTrans * trans = NEW(FileSrvIpAddressRequestTrans)(callback, param, isPatcher);
	NetTransSend(trans);
}