internal async Task ProcessRegisterRequestAsync(LocalDrpPeer receivedAtLocalDrpPeerNullable, RoutedRequest routedRequest)
{
var req = routedRequest.RegisterReq;
if (!ValidateReceivedReqTimestamp64(req.ReqTimestamp64))
{
throw new BadSignatureException($"invalid REGISTER REQ 265 ReqTimestamp64={MiscProcedures.Int64ticksToDateTime(req.ReqTimestamp64)}");
}
if (PendingRegisterRequestExists(req.RequesterRegistrationId))
{
routedRequest.Logger.WriteToLog_higherLevelDetail($"rejecting {req}: another request is already pending");
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable);
return;
}
_retry:
routedRequest.ReceivedFromNeighborNullable?.AssertIsNotDisposed();
if (!RouteRegistrationRequest(receivedAtLocalDrpPeerNullable, routedRequest, out var proxyToDestinationPeer, out var acceptAt)) // routing
{ // no route found
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable);
return;
}
if (acceptAt != null)
{ // accept the registration request here at this.LocalDrpPeer
routedRequest.ReceivedFromNeighborNullable?.AssertIsNotDisposed();
_ = AcceptRegisterRequestAsync(acceptAt, routedRequest);
}
else if (proxyToDestinationPeer != null)
{ // proxy the registration request to another peer
routedRequest.ReceivedFromNeighborNullable?.AssertIsNotDisposed();
var needToRerouteToAnotherNeighbor = await ProxyRegisterRequestAsync(routedRequest, proxyToDestinationPeer);
if (needToRerouteToAnotherNeighbor && routedRequest.ReceivedFromNeighborNullable?.IsDisposed != true)
{
routedRequest.TriedNeighbors.Add(proxyToDestinationPeer);
routedRequest.Logger.WriteToLog_detail($"retrying to proxy registration to another neighbor on error. already tried {routedRequest.TriedNeighbors.Count}");
routedRequest.ReceivedFromNeighborNullable?.AssertIsNotDisposed();
goto _retry;
}
}
else
{
routedRequest.Logger.WriteToLog_detail($"rejecting request: routing failed");
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable);
}
}
/// <summary>
/// main register responder proc for both A-EP and P2P modes
/// in P2P mode NeighborToken32 and NeighborHMAC are verified at this time
/// </summary>
/// <param name="receivedFromInP2pMode">
/// is null in A-EP mode
/// </param>
/// <returns>
/// true to retry the request with another neighbor (if the request needs to be "rerouted")
/// </returns>
internal async Task <bool> ProxyRegisterRequestAsync(RoutedRequest routedRequest, ConnectionToNeighbor destinationPeer) // engine thread
{
routedRequest.ReceivedFromNeighborNullable?.AssertIsNotDisposed();
var req = routedRequest.RegisterReq;
var logger = routedRequest.Logger;
logger.ModuleName = VisionChannelModuleName_reg_proxySide;
if (!ValidateReceivedReqTimestamp64(req.ReqTimestamp64))
{
logger.WriteToLog_needsAttention($"rejecting REGISTER request {req.RequesterRegistrationId}: invalid REGISTER REQ 457 ReqTimestamp64={MiscProcedures.Int64ticksToDateTime(req.ReqTimestamp64)}");
// await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero);
return(false);
}
if (PendingRegisterRequestExists(req.RequesterRegistrationId))
{
logger.WriteToLog_higherLevelDetail($"rejecting duplicate request {req}: requesterEndpoint={routedRequest.ReceivedFromEndpoint}");
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable);
return(false);
}
if (req.NumberOfHopsRemaining > RegisterRequestPacket.MaxNumberOfHopsRemaining || req.NumberOfRandomHopsRemaining > RegisterRequestPacket.MaxNumberOfHopsRemaining)
{
logger.WriteToLog_needsAttention($"rejecting {req}: invalid number of hops remaining");
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable);
return(false);
}
if (!routedRequest.CheckedRecentUniqueProxiedRequests)
{
var recentUniqueProxiedRegistrationRequests = req.RandomModeAtThisHop ? RecentUniqueProxiedRegistrationRequests_RandomHop : RecentUniqueProxiedRegistrationRequests_NonRandomHop;
if (!recentUniqueProxiedRegistrationRequests.Filter(req.GetUniqueRequestIdFields))
{
logger.WriteToLog_higherLevelDetail($"rejecting non-unique request {req}: requesterEndpoint={routedRequest.ReceivedFromEndpoint}");
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable);
return(false);
}
routedRequest.CheckedRecentUniqueProxiedRequests = true;
}
logger.WriteToLog_higherLevelDetail($"proxying {req}: requesterEndpoint={routedRequest.ReceivedFromEndpoint}, NumberOfHopsRemaining={req.NumberOfHopsRemaining}, ReqP2pSeq16={req.ReqP2pSeq16}, destinationPeer={destinationPeer}, sourcePeer={routedRequest.ReceivedFromNeighborNullable}");
if (!ValidateReceivedReqTimestamp64(req.ReqTimestamp64))
{
throw new BadSignatureException($"invalid REGISTER REQ ReqTimestamp64={MiscProcedures.Int64ticksToDateTime(req.ReqTimestamp64)} 3507");
}
req.NumberOfHopsRemaining--;
if (req.NumberOfHopsRemaining == 0)
{
logger.WriteToLog_needsAttention($"rejecting REGISTER request {req.RequesterRegistrationId}: max hops reached");
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero);
return(false);
}
_pendingRegisterRequests.Add(req.RequesterRegistrationId);
try
{
// send NPACK to source peer
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending NPACK to REQ source peer (delay={routedRequest.ReqReceivedSw_ms}ms)");
}
routedRequest.SendNeighborPeerAck_accepted_IfNotAlreadyReplied();
if (req.NumberOfRandomHopsRemaining >= 1)
{
req.NumberOfRandomHopsRemaining--;
}
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"decremented number of hops in {req}: NumberOfHopsRemaining={req.NumberOfHopsRemaining}, NumberOfRandomHopsRemaining={req.NumberOfRandomHopsRemaining}");
}
req.ReqP2pSeq16 = destinationPeer.GetNewRequestP2pSeq16_P2P();
byte[] ack1UdpData;
try
{
var sentRequest = new SentRequest(this, logger, destinationPeer.RemoteEndpoint, destinationPeer, req.Encode_OptionallySignNeighborHMAC(destinationPeer),
req.ReqP2pSeq16, RegisterAck1Packet.GetScanner(logger, req, destinationPeer));
// send (proxy) REQ to responder. wait for NPACK, verify NPACK.senderHMAC, retransmit REQ
// wait for ACK1 from destination peer
// verify NeighborHMAC
// var ack1R = await sentRequest.SendRequestAsync_NoExc("ack1 34601"); ////////////////////////////////// new method
ack1UdpData = await sentRequest.SendRequestAsync("ack1 34601");
// if (logger.WriteToLog_detail2_enabled) logger.WriteToLog_detail("got ACK1 result");
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 52460");
return(false);
}
if (destinationPeer?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 52460");
return(false);
}
//if (ack1R.ResponseCode != ResponseOrFailureCode.accepted)
//{
// logger.WriteToLog_higherLevelDetail($"got response={ack1R.ResponseCode} from destination {destinationPeer}");
// if (ack1R.ResponseCode == ResponseOrFailureCode.failure_routeIsUnavailable)
// req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial
// return true; // will retry
//}
//ack1UdpData = ack1R.UdpData;
}
catch (RequestRejectedException reqExc)
{
logger.WriteToLog_higherLevelDetail($"got exception: response={reqExc.ResponseCode} from destination {destinationPeer}");
if (reqExc.ResponseCode == ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero)
{
await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero);
return(false);
}
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 35346232");
return(false);
}
if (reqExc.ResponseCode == ResponseOrFailureCode.failure_routeIsUnavailable)
{
req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial
}
return(true); // will retry
}
catch (DrpTimeoutException exc)
{
logger.WriteToLog_higherLevelDetail($"got timeout error when requesting {destinationPeer}: {exc.Message}");
req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial
return(true); // will retry
}
catch (Exception reqExc)
{
logger.WriteToLog_mediumPain($"could not proxy REGISTER request: {reqExc}");
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 76897805");
return(false);
}
return(true); // will retry
}
var tr1 = CreateTracker("ack1 34601 2");
var ack1 = RegisterAck1Packet.DecodeAndOptionallyVerify(logger, ack1UdpData, req, null);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"verified ACK1 from destination");
}
// respond with NPACK
SendNeighborPeerAckResponseToRegisterAck1(ack1, destinationPeer);
// send ACK1 to source peer
// wait for ACK / NPACK
if (routedRequest.ReceivedFromNeighborNullable != null)
{ // P2P mode
routedRequest.ReceivedFromNeighborNullable.AssertIsNotDisposed();
ack1.ReqP2pSeq16 = routedRequest.ReceivedFromNeighborNullable.GetNewRequestP2pSeq16_P2P();
}
else
{ // A-EP mode
ack1.RequesterEndpoint = routedRequest.ReceivedFromEndpoint;
}
var ack1UdpDataTx = ack1.Encode_OpionallySignNeighborHMAC(routedRequest.ReceivedFromNeighborNullable);
var sourcePeerVisibleDescription = routedRequest.ReceivedFromNeighborNullable?.ToString() ?? routedRequest.ReceivedFromEndpoint.ToString();
var ack2Scanner = RegisterAck2Packet.GetScanner(logger, routedRequest.ReceivedFromNeighborNullable, req);
tr1.Dispose();
byte[] ack2UdpData;
if (routedRequest.ReceivedFromNeighborNullable == null)
{ // A-EP mode: wait for ACK2, retransmitting ACK1
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending ACK1, waiting for ACK2");
}
ack2UdpData = await OptionallySendUdpRequestAsync_Retransmit_WaitForResponse("ack2 12368", sourcePeerVisibleDescription,
ack1UdpDataTx, routedRequest.ReceivedFromEndpoint, ack2Scanner);
}
else
{ // P2P mode: retransmit ACK1 until NPACK (via P2P); at same time wait for ACK2
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending ACK1, awaiting for NPACK");
}
_ = OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("ack1 3686", ack1UdpDataTx, routedRequest.ReceivedFromEndpoint,
ack1.ReqP2pSeq16, routedRequest.ReceivedFromNeighborNullable, ack1.GetSignedFieldsForNeighborHMAC);
// not waiting for NPACK, wait for ACK2
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"waiting for ACK2");
}
ack2UdpData = await OptionallySendUdpRequestAsync_Retransmit_WaitForResponse("ack2 345209", sourcePeerVisibleDescription,
null, routedRequest.ReceivedFromEndpoint, ack2Scanner);
}
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"received ACK2");
}
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 2345135");
return(false);
}
if (destinationPeer?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 2345135");
return(false);
}
var ack2 = RegisterAck2Packet.Decode_OptionallyVerify_InitializeP2pStreamAtResponder(logger, ack2UdpData, null, null, null);
// send NPACK to source peer
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending NPACK to ACK2 to source peer");
}
SendNeighborPeerAckResponseToRegisterAck2(ack2, routedRequest.ReceivedFromEndpoint, routedRequest.ReceivedFromNeighborNullable);
// send ACK2 to destination peer
// put ACK2.ReqP2pSeq16, sendertoken32, senderHMAC
// wait for NPACK
if (destinationPeer.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 345784567");
return(false);
}
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 345784567");
return(false);
}
ack2.ReqP2pSeq16 = destinationPeer.GetNewRequestP2pSeq16_P2P();
await destinationPeer.SendUdpRequestAsync_Retransmit_WaitForNPACK("ack2 41937", ack2.Encode_OptionallySignNeighborHMAC(destinationPeer),
ack2.ReqP2pSeq16, ack2.GetSignedFieldsForNeighborHMAC);
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 234646");
return(false);
}
if (destinationPeer?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 234646");
return(false);
}
// wait for CFM from source peer
var cfmUdpData = await OptionallySendUdpRequestAsync_Retransmit_WaitForResponse("cfm 234789", sourcePeerVisibleDescription, null,
routedRequest.ReceivedFromEndpoint,
RegisterConfirmationPacket.GetScanner(logger, routedRequest.ReceivedFromNeighborNullable, req)
);
var cfm = RegisterConfirmationPacket.DecodeAndOptionallyVerify(cfmUdpData, null, null);
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 3452326");
return(false);
}
if (destinationPeer?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 3452326");
return(false);
}
// TODO verify signatures and update QoS
// send NPACK to source peer
SendNeighborPeerAckResponseToRegisterCfm(cfm, routedRequest.ReceivedFromEndpoint, routedRequest.ReceivedFromNeighborNullable);
// send CFM to responder
// wait for NPACK from destination peer, retransmit
if (destinationPeer.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 123678");
return(false);
}
if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true)
{
logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 123678");
return(false);
}
cfm.ReqP2pSeq16 = destinationPeer.GetNewRequestP2pSeq16_P2P();
await destinationPeer.SendUdpRequestAsync_Retransmit_WaitForNPACK("cfm 1357", cfm.Encode_OptionallySignNeighborHMAC(destinationPeer),
cfm.ReqP2pSeq16, cfm.GetSignedFieldsForNeighborHMAC);
logger.WriteToLog_higherLevelDetail($"proxying {req} is successfully complete");
}
catch (DrpTimeoutException exc)
{
logger.WriteToLog_lightPain($"could not proxy REGISTER: request timeout: {exc.Message}");
}
catch (Exception exc)
{
logger.WriteToLog_mediumPain($"could not proxy REGISTER request: {exc}");
}
finally
{
_pendingRegisterRequests.Remove(req.RequesterRegistrationId);
}
return(false);
}