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

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

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

And the code that uses this

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,

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.

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;
});