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Frank: The Web API DSL

by Ryan Riley on Feb 26, 2012

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Most .NET web applications today use ASP.NET WebForms or MVC. However, several F# libraries offer new ways to build web APIs and applications help reduce code and offer better abstractions, especially for single-page applications (SPA). How can F# improve the situation? Frank is a minimal, domain-specific library designed to leverage the power of HTTP using functions directly.

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Frank: The Web API DSL Presentation Transcript

FrankThe Web API DSL

Ryan RileyO Logos Bible SoftwareO Community for F#O F# MVPO OSS: FSharpx, Fracture, FrankO @panesofglass

HTTP PartsO Request/Response Lines O Methods, URIs, Status CodesO Headers O General, Request, Response, ContentO ResourcesO RepresentationsO Hypermedia

FrankO F# DSL using System.Net.HttpO Headers compositionO Follows the natural composition of HTTPO Frank Resources == HTTP ResourcesO Define your own conventions!

Function CompositionO Functional programming offers solutions to these problems O Filter O Map O Reduce

Simplest HTTP Application HttpRequestMessage -> HttpResponseMessage

Simplest HTTP Frank Application HttpRequestMessage -> HttpResponseMessageHttpRequestMessage -> Async<HttpResponseMessage>

ResourcesGET /item/1+ POST /item/1+ PUT /item/1+ OPTIONS /item/1=Resource at / with GET, POST, PUT, &OPTIONS

Define a Method Handler// handlerlet echo request = async { let! body = request.Content.AsyncReadAsString() return HttpResponseMessage.ReplyTo(request, body)}// method handlerget echo

Define a Resourcelet helloworld request = async { … }let echo request = async { … }let resource = route “/” (get helloworld <|> post echo)

HTTP Applications/+ /items+ /item/{itemId}+ /help=Typical HTTP “application”

Define an Applicationlet todoListResource = route “/” (get todoList <|> …)let todoItemResource = route “/item/{1}” (put …)let app = merge [ todoListResource; todoItemResource ]

Content NegotiationClient Accepts Server Supportsapplication/xml;q=0.9 application/jsonapplication/json;q=0.8 text/plaintext/plain;q=0.5 text/html application/json

Leverage Connegval negotiateMediaType = formatters -> HttpRequestMessage -> string -> Async<HttpResponseMessage>let echo = negotiateMediaType formatters <| fun request -> request.Content.AsyncReadAsString())

Summary

ResourcesO ASP.NET Web Forms in F#O ASP.NET MVC in F#O Figment DSL for MVCO Frank DSL for Web APIO WebSharperO Pit FW

Thank you!O Please rate this talk: http://speakerrate.com/talks/9334-frank-the-web-api-dsl