public override void ServerLateUpdate()
{
// flush reliable messages after latency
while (reliableServerToClient.Count > 0)
{
// check the first message time
QueuedMessage message = reliableServerToClient[0];
if (message.time + reliableLatency <= Time.time)
{
// send and eat
wrap.ServerSend(message.connectionId, Channels.Reliable, new ArraySegment <byte>(message.bytes));
reliableServerToClient.RemoveAt(0);
}
// not enough time elapsed yet
break;
}
// flush unreliable messages after latency
while (unreliableServerToClient.Count > 0)
{
// check the first message time
QueuedMessage message = unreliableServerToClient[0];
if (message.time + unreliableLatency <= Time.time)
{
// send and eat
wrap.ServerSend(message.connectionId, Channels.Unreliable, new ArraySegment <byte>(message.bytes));
unreliableServerToClient.RemoveAt(0);
}
// not enough time elapsed yet
break;
}
// update wrapped transport too
wrap.ServerLateUpdate();
}
public override void ServerLateUpdate()
{
// flush reliable messages that are ready to be sent
// => list isn't ordered (due to scramble). need to iterate all.
for (int i = 0; i < reliableServerToClient.Count; ++i)
{
QueuedMessage message = reliableServerToClient[i];
if (Time.time >= message.timeToSend)
{
// send and remove
wrap.ServerSend(message.connectionId, Channels.DefaultReliable, new ArraySegment <byte>(message.bytes));
reliableServerToClient.RemoveAt(i);
--i;
}
}
// flush unrelabe messages that are ready to be sent
// => list isn't ordered (due to scramble). need to iterate all.
for (int i = 0; i < unreliableServerToClient.Count; ++i)
{
QueuedMessage message = unreliableServerToClient[i];
if (Time.time >= message.timeToSend)
{
// send and remove
wrap.ServerSend(message.connectionId, Channels.DefaultUnreliable, new ArraySegment <byte>(message.bytes));
unreliableServerToClient.RemoveAt(i);
--i;
}
}
// update wrapped transport too
wrap.ServerLateUpdate();
}
public override void ClientLateUpdate()
{
// flush reliable messages after latency
while (reliableClientToServer.Count > 0)
{
// check the first message time
QueuedMessage message = reliableClientToServer[0];
if (message.time <= Time.time)
{
// send and eat
wrap.ClientSend(new ArraySegment <byte>(message.bytes), Channels.Reliable);
reliableClientToServer.RemoveAt(0);
}
// not enough time elapsed yet
break;
}
// flush unreliable messages after latency
while (unreliableClientToServer.Count > 0)
{
// check the first message time
QueuedMessage message = unreliableClientToServer[0];
if (message.time <= Time.time)
{
// send and eat
wrap.ClientSend(new ArraySegment <byte>(message.bytes), Channels.Unreliable);
unreliableClientToServer.RemoveAt(0);
}
// not enough time elapsed yet
break;
}
// update wrapped transport too
wrap.ClientLateUpdate();
}
// helper function to simulate a send with latency/loss/scramble
void SimulateSend(int connectionId, int channelId, ArraySegment <byte> segment, List <QueuedMessage> reliableQueue, List <QueuedMessage> unreliableQueue)
{
// segment is only valid after returning. copy it.
// (allocates for now. it's only for testing anyway.)
byte[] bytes = new byte[segment.Count];
Buffer.BlockCopy(segment.Array, segment.Offset, bytes, 0, segment.Count);
// enqueue message. send after latency interval.
QueuedMessage message = new QueuedMessage
{
connectionId = connectionId,
bytes = bytes
};
switch (channelId)
{
case Channels.DefaultReliable:
// simulate latency & spikes
message.timeToSend = Time.time + SimulateLatency(reliableLatency, reliableLatencySpikes);
reliableQueue.Add(message);
break;
case Channels.DefaultUnreliable:
// simulate packet loss
bool drop = random.NextDouble() < unreliableLoss;
if (!drop)
{
// simulate scramble (Random.Next is < max, so +1)
// note that list entries are NOT ordered by time anymore
// after inserting randomly.
int last = unreliableQueue.Count;
int index = unreliableScramble ? random.Next(0, last + 1) : last;
// simulate latency & spikes
message.timeToSend = Time.time + SimulateLatency(unreliableLatency, unreliableLatencySpikes);
unreliableQueue.Insert(index, message);
}
break;
default:
Debug.LogError($"{nameof(LatencySimulation)} unexpected channelId: {channelId}");
break;
}
}
// helper function to simulate a send with latency/loss/scramble
void SimulateSend(int connectionId, int channelId, ArraySegment <byte> segment, float latency, List <QueuedMessage> reliableQueue, List <QueuedMessage> unreliableQueue)
{
// segment is only valid after returning. copy it.
// (allocates for now. it's only for testing anyway.)
byte[] bytes = new byte[segment.Count];
Buffer.BlockCopy(segment.Array, segment.Offset, bytes, 0, segment.Count);
// enqueue message. send after latency interval.
QueuedMessage message = new QueuedMessage
{
connectionId = connectionId,
bytes = bytes,
time = Time.time + latency
};
switch (channelId)
{
case Channels.Reliable:
// simulate latency
reliableQueue.Add(message);
break;
case Channels.Unreliable:
// simulate packet loss
bool drop = random.NextDouble() < unreliableLoss;
if (!drop)
{
// simulate scramble (Random.Next is < max, so +1)
bool scramble = random.NextDouble() < unreliableScramble;
int last = unreliableQueue.Count;
int index = scramble ? random.Next(0, last + 1) : last;
// simulate latency
unreliableQueue.Insert(index, message);
}
break;
default:
Debug.LogError($"{nameof(LatencySimulation)} unexpected channelId: {channelId}");
break;
}
}
