Dishan Philips

  • Work with Google Integrity verdicts on .NET C#

    There are no clear examples of how an Attestation statement can be verified on C# locally.
    Spent sometime to get it working.

    var decryptionKey = Convert.FromBase64String("<DECRYPTION KEY");
var verificationKey = Convert.FromBase64String("<VERIFICATION KEY");
var signedAttestationStatement = "<ATTESTATION STATEMENT";

var ecDsa = ECDsa.Create();
ecDsa.ImportSubjectPublicKeyInfo(new ReadOnlySpan<byte(verificationKey), out _);

var decrypted = Jose.JWT.Decode(signedAttestationStatement, decryptionKey);
var payload = Jose.JWT.Decode(decrypted, ecDsa);
    …

  • My 2021 On Strava

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  • Körkort – My Experience

    I moved to Stockholm in October 2020, in the middle of a pandemic. Found out we are having out first kid. Fun times. Anyway, decided to get my license for the 3rd time. Once in Sri Lanka, then in Abu Dhabi and now in Stockholm. So here is how it went.

    I was really lucky to have found my driving school. They were super nice. The teach spoke excellent English and honestly made me a far better driver than who I was.

    This is not sponsored article, I think they are really good. Here is a link to their website …

  • Protobuf-net Generics on Unity3D IL2CPP.

    When using Protobuf-net in Unity3D, if your Proto-Contracts include generics you might run into a few issues like Unable to resolve MapDecorator constructor.

    I had to work with the following contract. It was s custom collection class which had a functionality of caching removed elements in the collection.

    [ProtoContract]
public class CustomCollectionBase<TCollection, TElement, TKey{
	[ProtoMember(1)]
	protected TCollection _collection;

	[ProtoMember(2)]
	protected SortedDictionary<TKey, bool_removed;

	public CustomCollectionBase(TCollection collection)
	{
		_collection = collection;
	}
}

[ProtoContract]
public class CustomList<TElement: CustomCollectionBase<List<TElement, TElement, int{
	public CustomList() : base( new List<TElement())
	{
	}
}

[ProtoContract]
public class CustomIntDictionary<TElement: CustomCollectionBase<Dictionary<int,
    …

  • JSON vs Protobuf

    I did a few tests to compare the data payload sizes of different serialization methods on .NET client server communications.

    The test was basically to execute a request/response 20 times.

    Request

    [Serializable]
[ProtoContract]
public class GetRatingRequest
{
        [ProtoMember(1)]
        public int Rating;
        [ProtoMember(2)]
        public int Count;
        [ProtoMember(3)]
        public float A;
        [ProtoMember(4)]
        public float B;
        [ProtoMember(5)]
        public float C;
        [ProtoMember(6)]
        public float D;
        [ProtoMember(7)]
        public float E;
}

    Response

    [Serializable]
[ProtoContract]
public class GetRatingResponse
{
        [ProtoMember(1)]
        public List<RatingRatings;
}

[Serializable]
[ProtoContract]
public class Rating
{
        [ProtoMember(1)]
        public bool HighRating { get; set; }
        [ProtoMember(2)]
        public RatingDetail Details { get; set; }
    …

  • Redis .net Tips and Tricks.

    1. Create a Singleton of the Redis connection multiplexer and use it everywhere.
    2. When establishing the connection to the Redis cluster, use a lock on to ensure that multiple threads don’t create the connection concurrently.
    3. Under load of you see that Redis is timing out set ThreadPool.SetMinThreads(…) to around 250 depending on your application. More here – https://docs.microsoft.com/en-us/dotnet/api/system.threading.threadpool.setminthreads?view=netcore-2.0#System_Threading_ThreadPool_SetMinThreads_System_Int32_System_Int32_
    4. If you are executing Lua scripts, ensure that they are performing well using the Redis slow.
    5. If you are running a Redis cluster, ensure that the BGSAVE of each node in the cluster runs at different times. If they run at once, there
    …

  • C# Dynamic Object Creation Performance

    Recently I had to task to create a dynamic object creation factory in C#. So I thought I test all the options I have to check what performs best.

    I also wanted to check the performance implications these options have with the number of parameters in the constructor.

    The Options

    1. new T() – Using the new/constructor method to
      instantiate objects
    2. Activator.CreateInstance(typeof(T)) – Using the Activator class to instantiate objects
    3. ConstructorInfo.Invoke() – Using the constructor info reflection class to instantiate objects
    4. Func<T>() – Using compiled lambda expressions to instantiate objects

    The Test

    I ran some tests to see calculate how each …

  • C# .net Core MapRoute Not Working?

    Recently I faced a challenge while trying to programatically register routes on a .net core MVC application. The following was my code.

    app.UseMvc(routeBuilder =
                     {
                         routeBuilder.MapRoute(
                             name: "example-route",
                             template: "example",
                             defaults: new { controller = "ExampleController", action = "ExampleAction" }
                         );
    });

    Once the route was registered, I tried navigating to it and I kept getting a 404. Was breaking my head as to why this was happening. Finally found the issue.

    The controller name cannot have the post-fix Controller, the following change made the trick.

    app.UseMvc(routeBuilder =
                     {
                         routeBuilder.MapRoute(
                             name: "example-route",
                             template: "example",
                             defaults: new { controller = "Example
    …

  • My 2018 on Strava

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  • Native IOS Plugins for Unity 3D Tutorial from A-Z

    Following my tutorial on how you can create Android Plugins for Unity 3D, I decided to write a tutorial on how to create IOS plugins for Unity 3D with Objective C. I will be following the same incremental approach used in creating the Android plugin. This tutorial will cover the most basic aspects of writing a custom plugin for IOS. It covers the aspects of creating the XCode static library. Generating the Unity Project and running the project using Unity. To understand the tutorial you should have a basic understanding of Objective C, C, C# and XCode.

    Setup Directory Structure

    …

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