Four .NET Web Frameworks in Less Than an Hour

1. Four Other .NET Web Frameworks in Less Than an Hour Christian Horsdal @chr_horsdal http://horsdal.blogspot.com/

2. Who Am I?  Lead Software Architect @ Mjølner Informatics  Husband and Father  Some who enjoys  Clean code  TDD‟ing  When ‟GF wins  Simplicity  Whisky 3

3. Why?  There are alternatives to ASP.NET  Know them!  Style matters  Tradeoffs, tradeoffs, tradeoffs  Conventions <-> explicitness  DRY <-> separation of concerns  Abstract <-> concrete 4

4. Why?  Run anywhere  IoC/DI to the bone  Embrace HTTP  OSS and community driven 5

5. What will you learn? A taste of some alternatives  FubuMVC  OpenRasta  Nancy  Frank 6

6. Sample 7

7. FubuMVC – At a glance  One Model In One Model Out  Aka OMIOMO  Aka Russian Doll  Convention over Configuration  Really cool built-in diagnostics  Everything is POCOs 8

8. FubuMVC – ShortUrl Overview GET “/” HomeController.get_Home HomeView.cshtml • Returns • Takes • No params HomeViewModel HomeViewModel POST “/” HomeController.post_Home UrlShortenedView.cshtml • UrlShorteningModel • Takes • Takes UrlShorteningModel UrlShorteningViewModel • Returns UrlShorteningViewModel GET “/42” HomeController.post_Home • Takes ShortenedUrlMode • ShortenedUrlModel • Returns FubuContinuation 9

9. FubuMVC – ShortUrl – Serving the FORM public class HomeController { public HomeController(UrlStore urlStore) { this.urlStore = urlStore; } @model ShortUrlInFubuMvc.HomeViewModel public HomeViewModel get_home() @{ { Layout = null; return new HomeViewModel(); } } <!DOCTYPE html> … <html> } <body> <form method="post" action="home"> public class HomeViewModel { } <label>Url: </label> <input type="text" name="url"/> <input type="submit" value="shorten"/> </form> 10 </body>

10. FubuMVC – ShortUrl – POST the FORM public UrlShorteningViewModel post_home(UrlShorteningModel input) { var shortenedUrl = input.Url.GetHashCode().ToString(); urlStore.SaveUrl(input.Url, shortenedUrl); return new UrlShorteningViewModel { Host = "localhost:51862", HashCode = shortenedUrl }; } public class UrlShorteningModel { public string Url { get; set; } } public class UrlShorteningViewModel { public string Host { get; set; } 11 public string HashCode { get; set; }

11. FubuMVC – ShortUrl - Redirecting public FubuContinuation get_Url(ShortenedUrlModel input) { var longUrl = urlStore.GetUrlFor(input.Url) ?? "/notfound/"; return FubuContinuation.RedirectTo(longUrl); } public class ShortenedUrlModel { public string Url { get; set; } } 12

12. OpenRasta– At a glance  Three things:  Resources  Handlers  Codecs  Automatic conneg  Everything is POCOs 13

13. OpenRasta – Shorturl Overview  Resource:  “/”  “/{shortenedUrl}”  Home GET “/” POST “/” GET “/42”  Handler  HomeHandler  “Codecs” Home resource  WebForms viewengine HomeHandler  Form data 14

14. OpenRasta– ShortUrl – Serving the FORM public class HomeHandler { public HomeHandler(IRequest request, UrlStore urlStore) { public class Configuration : IConfigurationSource this.request = request; { this.urlStore = urlStore; public void Configure() } { using (OpenRastaConfiguration.Manual) public Home Get() { { ResourceSpace.Has return new Home(); .ResourcesOfType<Home>() } .AtUri("/").And.AtUri("/home") … .And.AtUri("/{shortenedUrl}") } .HandledBy<HomeHandler>() .RenderedByAspx("~/Views/Home.aspx"); public class Home { public string LongUrl { get; set; } ResourceSpace.Uses public string ShortUrl { get; set; } .Resolver.AddDependencyInstance<UrlStore> public string Host { get; set; } } } 15 }

15. OpenRasta– ShortUrl – POST the FORM public Home Post(Home input) { input.ShortUrl = input.LongUrl.GetHashCode().ToString(); input.Host = request.Uri.Host + ":" + request.Uri.Port; urlStore.SaveUrl(input.LongUrl, input.ShortUrl); return input; } 16

16. OpenRasta– ShortUrl - Redirecting public OperationResult Get(string shortenedUrl) { var longUrl = urlStore.GetUrlFor(shortenedUrl); if (longUrl != null) return new OperationResult.SeeOther { RedirectLocation = new Uri(longUrl) }; else return new OperationResult.NotFound(); } 17

17. Nancy– At a glance  Lightweight, low ceremony  Just works  But easily swappable  DSLs  Built in diagnostics  Testability is first class 18

18. Nancy – Shorturl Overview  Modules  ShortUrlModule  Routes  Get[“/”]  Post[“/”]  Get[“/{shortenedUrl}”] HTTP Routes Handler Response request function  A lambda for each 19

19. Nancy– ShortUrl – Serving the FORM public class ShortUrlModule : NancyModule { public ShortUrlModule(UrlStore urlStore) { Get["/"] = _ => View["index.html"]; … } … } <!DOCTYPE html> <html> <body> <form method="post" action="home"> <label>Url: </label> <input type="text" name="url"/> <input type="submit" value="shorten"/> </form> </body> </html> 20

20. Nancy– ShortUrl – POST the FORM public class ShortUrlModule : NancyModule { public ShortUrlModule(UrlStore urlStore) { Get["/"] = _ => View["index.html"]; Post["/"] = _ => ShortenUrl(urlStore); … } private Response ShortenUrl(UrlStore urlStore) { string longUrl = Request.Form.url; var shortUrl = longUrl.GetHashCode().ToString(); urlStore.SaveUrl(longUrl, shortUrl); return View["shortened_url", new { Request.Headers.Host, ShortUrl = shortUrl }]; } … } 21

21. Nancy– ShortUrl - Redirecting public class ShortUrlModule : NancyModule { public ShortUrlModule(UrlStore urlStore) { Get["/"] = _ => View["index.html"]; Post["/"] = _ => ShortenUrl(urlStore); Get["/{shorturl}"] = param => { string shortUrl = param.shorturl; return Response.AsRedirect(urlStore.GetUrlFor(shortUrl.ToString())); }; } … } 22

22. Frank– At a glance  F#  Bare bones approach to HTTP services  Leverage WebAPI  Compositional 23

23. Frank– ShortUrl – Serving the FORM let urlShortenerView = @"<!doctype html><meta charset=utf-8> <title>Hello</title> <p>Hello, world! <form action=""/"" method=""post"" enctype=""multipart/form-data""> <input type=""input"" name=""longUrl"" value=""long url""> <input type=""submit"">" let urlShortenerForm request = async { return respond HttpStatusCode.OK (new StringContent(urlShortenerView, System.Text.Encoding.UTF8, "text/html")) <| ``Content-Type`` "text/html" } 24

24. Frank– ShortUrl – POST the FORM let createShortUrl (request: HttpRequestMessage) = async { let! value = request.Content.AsyncReadAsMultipart() let longUrl = value.FirstDispositionNameOrDefault("longUrl") .ReadAsStringAsync().Result; let urlKey = longUrl.GetHashCode().ToString() urlStore.Add(urlKey, longUrl) let shortUrl = baseUri + "/" + longUrl.GetHashCode().ToString() return respond HttpStatusCode.OK (new StringContent(shortUrlCreatedView(shortUrl), System.Text.Encoding.UTF8, "text/html")) <| ``Content-Type`` "text/html" } 25

25. Frank– ShortUrl - Redirecting let getShortUrl (request: HttpRequestMessage) = async { let urlKey = request .RequestUri .Segments.[request.RequestUri.Segments.Length - 1] let longUrl = urlStore.[urlKey] return respond HttpStatusCode.Redirect (new EmptyContent()) <| Location (new Uri(longUrl)) } let rootResource = routeResource "/" [ get urlShortenerForm <|> post createShortUrl ] let redirectReource = routeResource "/{shortUrl}" [ get getShortUrl ] let app = merge [ rootResource; redirectReource ] let config = new HttpSelfHostConfiguration(baseUri) config.Register app 26

26. Why, again?  There are alternatives to ASP.NET  Know them!  Style matters  Tradeoffs, tradeoffs, tradeoffs 27

27. What might you have learned? A taste of some altenatives  FubuMVC  OMIOMU  OpenRasta  Resources, Handlers, Codecs  Nancy  DSL  Frank  F# 28

28. FubuMVC, OpenRasta, Nancy, Frank WHEN, WHAT, WHERE? 29

29. Evaluation page: http://bit.ly/cd2012b2 Please fill in! „kthxbai

Four .NET Web Frameworks in Less Than an Hour

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