What I have learned by building .NET Stars -part 5 – always available data for a display website

What I have learned by building .NET Stars -part 5 – always available data for a display website

Dotnet Stars being a site just for displaying data, it does not require an API per se. Yes, for development purposes it needs a database and an API to display – but later – the data could be retrieved from local.

The first part is to write data in JSON files near to Blazor . But how to export by default this ?

And here ASPIRE thrives : I have made a console app to export data – and registered in ASPIRE with dependency of Blazor – and can see where Blazor folder is.

this is the extension

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public static IResourceBuilder<TRes> AddPathToEnvironmment<TProject,TRes>(
        this IResourceBuilder<TRes> builder, TProject p, string name)
        where TProject : IProjectMetadata, new()
        where TRes : IResourceWithEnvironment           
{
    //var p = new TProject();       
    string pathPrj = p.ProjectPath;
    var fi = new FileInfo(pathPrj);
    string dirName = fi?.DirectoryName ?? "";
    var projectBuilder = builder
        .WithEnvironment(ctx=>
        {
            ctx.EnvironmentVariables[name] =dirName;
            ctx.EnvironmentVariables[$"{name}csproj"] = pathPrj;
        });
 
    return projectBuilder;
}

and this is how it is used

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var exportToJson = builder.AddProject<Projects.StatsExport>("statsExport")
    .WithReference(ui)   
    .WithReference(db)
    .WaitFor(db)
    .AddPathToEnvironmment(new Projects.StatsBlazorUI(),"pathToWrite")
    ;

And the code that uses this

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var pathToWrite = Environment.GetEnvironmentVariable("pathToWrite");
if (string.IsNullOrWhiteSpace(pathToWrite))
{
    Console.WriteLine("please add a path to write");
    return;
}

The second part is to get data from WebAPI , if available, and, if not, from JSON files.
And here the Roslyn Code Generator, https://github.com/ignatandrei/RSCG_CompositeProvider , it is useful .
We have 2 implementations of same interface ,

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public interface IStatsData
{
   //other code
    IAsyncEnumerable<IProjectWithStars> GetProjectsWithStars();
}

And we have an implementation from WebAPI and another from JSON files

With the nugethttps://nuget.org/packages/RSCG_CompositeProviderwe can obtain data from the first that returns data.

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builder.Services.AddKeyedScoped<IStatsData>("both", (sp, obj) =>
{
    var statsDataLocal = sp.GetRequiredKeyedService<IStatsData>("local_host");
    var statsDataAPI = sp.GetRequiredKeyedService<IStatsData>("statsconsole_host");
    StatsData_CP composite = new(statsDataAPI, statsDataLocal);
    composite.UseFirstTheLastOneThatWorks = true;
    return composite;
});