Network settings

The configuration of the NetworkDriver is defined using the NetworkSettings API. It might be required to change some of the default values of the parameters, that can be done as in the following example.

NetworkSettings example

var settings = new NetworkSettings();
settings.WithNetworkConfigParameters(disconnectTimeoutMS: 1000);
var driver = NetworkDriver.Create(settings);

Extending the NetworkSettings

When extending Unity Transport it's often useful to add custom parameters or settings that users can set to define the configuration of the NetworkDriver. S That can be done by extending the NetworkSettings API so the custom Network Interfaces or Pipelines can capture the parameter values inside the Initialization method as detailed in the following sections.

INetworkParameter

By implementing the INetworkParameter interface, any unmanaged struct can be identified as a network parameter that can be assigned to the NetworkDriver settings.

The NetworkSettings will automatically call the Validate() method and will throw an exception if false is returned.

INetworkParameter example

public struct MyCustomParameter : INetworkParameter
{
    public int MyCustomInt;
    public float MyCustomFloat;

    public bool Validate()
    {
        if (MyCustomInt <= 0)
        {
            UnityEngine.Debug.LogError($"{nameof(MyCustomInt)} value ({MyCustomInt}) must be greater than 0");
            return false;
        }

        return true;
    }
}

NetworkSettings extension methods

Every new custom INetworkParameter requires of at least one extension method to the NetworkSettings API. These extension methods must receive and return a ref NetworkSettings to ensure the proper functioning of the fluent interface.

Those constraints are checked by the Roslyn Analyzers provided in the Unity Transport package.

NetworkSettings extension methods example

public static class MyCustomParameterExtensions
{
    private const int k_MyCustomIntDefault = 1024;
    private const float k_MyCustomFloatDefault = 1.0f;

    public static ref NetworkSettings WithMyCustomParameters(
        ref this NetworkSettings settings,
        int myCustomInt = k_MyCustomIntDefault,
        float myCustomFloat = k_MyCustomFloatDefault
    )
    {
        var parameter = new MyCustomParameter
        {
            MyCustomInt = myCustomInt,
            myCustomFloat = myCustomFloat,
        };

        settings.AddRawParameterStruct(ref parameter);

        return ref settings;
    }

    public static MyCustomParameter GetMyCustomParameters(ref this NetworkSettings settings)
    {
        if (!settings.TryGet<MyCustomParameter>(out var parameter))
        {
            parameter.MyCustomInt = k_MyCustomIntDefault;
            parameter.MyCustomFloat = k_MyCustomFloatDefault;
        }

        return parameter;
    }
}