Mike-Ward.Net

Asset Bundling in NancyFx - Part 3

21 Feb 2014

In parts 1 and 2, I built an Asset Bundling facility for use in NancyFx. It provides a very easy (dare I say, super-duper-happy) method to bundling assets in NancyFx. In this last part, I’ll add asynchronous support.

In recent releases, NancyFx has added support for asynchronous route handling. Adding asynchronous support to the Asset Bundling code is easy using C#’s new async/await facility.

First I’ll extend the Bundle class to include three new functions that support async:

public static async Task StylesAsync(this IResponseFormatter formatter, IEnumerable<string> files, 
    IRootPathProvider rootPathProvider)
{
    return await formatter.GetBundleAsync(files, rootPathProvider, CssMimeType);
}

public static async Task ScriptsAsync(this IResponseFormatter formatter, IEnumerable<string> files, 
    IRootPathProvider rootPathProvider)
{
    return await formatter.GetBundleAsync(files, rootPathProvider, JsMimeType);
}

public static async Task GetBundleAsync(this IResponseFormatter formatter, IEnumerable<string> files,
            IRootPathProvider rootPathProvider, string contentType)
{
    var responseTask = new Task(() => GetBundle(formatter, files, rootPathProvider, contentType));
    responseTask.Start();
    return await responseTask;
}

https://gist.github.com/mike-ward/9100604

And here’s how to use it:

public SiteModule(IRootPathProvider rootPathProvider)
{
    Get["/"] = p => View["home"];

    Get["/styles", true] = async (p, ct) => await Response.StylesAsync(
        new[] {"css/pure-min.css", "css/styles.css"}, rootPathProvider);

    Get["/scripts", true] = async (p, ct) => await Response.ScriptsAsync(
        new[] {"js/third-party/angular.min.js", "js/app/app.js"}, rootPathProvider);
}

Easy, smeasy!

What’s next?

It might be fun to look into adding some of the other traditional asset bundling services like SASS and Coffeescript support. These are harder nuts-to-crack in that native .NET implementations do not exist. One thought I had was to translate libsass to C#. Suggestions for other features are welcomed!

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Asset Bundling in NancyFx - Part 3

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