/// <summary>
/// Requests system time from all connected peers, collects responses after 5 seconds
/// and computes the median
/// </summary>
/// <returns>Median diff of all responses</returns>
public long SyncTime()
{
// process responses
List<long> diffs = new List<long>();
foreach (KeyValuePair<Hash, ResponseStruct> entry in collectedResponses)
diffs.Add(entry.Value.diff);
diffs.Add(0);
collectedResponses = new ConcurrentDictionary<Hash, ResponseStruct>();
long diff = computeDiff(diffs);
double display = ((double)diff) / 10000000;
DateTime st = DateTime.FromFileTimeUtc(nodeState.SystemTime);
DateTime nt = DateTime.FromFileTimeUtc(nodeState.NetworkTime);
Print(diffs.Count + " resp; diff " + display/*.ToString("0.000")*/ + "; \tst: " + st.ToLongTimeString() + "; \tnt: " + nt.ToLongTimeString());
//send new requests
//Print("start syncing with " + nodeState.ConnectedValidators.Count + " peers");
sentRequests = new ConcurrentDictionary<Hash, RequestStruct>();
foreach (Hash peer in nodeState.ConnectedValidators)
{
// save locally
RequestStruct rs = new RequestStruct();
rs.senderTime = nodeState.SystemTime;
rs.token = TNetUtils.GenerateNewToken();
sentRequests.AddOrUpdate(peer, rs, (ok, ov) => rs);
// send message
TimeSyncRqMsg request = new TimeSyncRqMsg();
request.senderTime = nodeState.SystemTime;
byte[] message = request.Serialize();
NetworkPacket packet = new NetworkPacket(nodeConfig.PublicKey, PacketType.TPT_TIMESYNC_REQUEST, message, rs.token);
networkPacketSwitch.AddToQueue(peer, packet);
}
return diff;
}
/// <summary>
/// Takes one encoded request and sends an encoded response
/// </summary>
/// <param name="packet"></param>
private void requestHandler(NetworkPacket packet)
{
// unpacking request
TimeSyncRqMsg request = new TimeSyncRqMsg();
request.Deserialize(packet.Data);
// sending response
TimeSyncRsMsg response = new TimeSyncRsMsg();
response.senderTime = request.senderTime;
response.responderTime = nodeState.SystemTime;
byte[] data = response.Serialize();
Hash token = packet.Token;
NetworkPacket respacket = new NetworkPacket(nodeConfig.PublicKey, PacketType.TPT_TIMESYNC_RESPONSE, data, token);
networkPacketSwitch.AddToQueue(packet.PublicKeySource, respacket);
}