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feature: MessagePacking.Pack<T> returns bool to indicate if the message could be packed or not

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This commit is contained in:
vis2k 2021-06-18 20:02:53 +08:00
parent e5771c23a0
commit c106489772
1 changed files with 20 additions and 2 deletions
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22
Assets/Mirror/Runtime/MessagePacking.cs
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@ -28,14 +28,32 @@ public static ushort GetId<T>() where T : struct, NetworkMessage
// pack message before sending
// -> NetworkWriter passed as arg so that we can use .ToArraySegment
// and do an allocation free send before recycling it.
public static void Pack<T>(T message, NetworkWriter writer)
// -> true if message is of valid size, false if too big
public static bool Pack<T>(T message, NetworkWriter writer)
where T : struct, NetworkMessage
{
// remember writer position
int backup = writer.Position;
// writer header
ushort msgType = GetId<T>();
writer.WriteUShort(msgType);
// serialize message into writer
// writer content and calculate the size
int before = writer.Position;
writer.Write(message);
int contentSize = writer.Position - before;
// we only allow up to MaxContentSize.
// anything else can't be sent over transport.
if (contentSize > MaxContentSize)
{
// roll back writer (atomic), show useful message to the user
writer.Position = backup;
Debug.LogWarning($"Failed to Pack {typeof(T)} because it serialized into {contentSize} bytes, which exceeds the limit of {MaxContentSize} bytes.");
return false;
}
return true;
}
// unpack message after receiving