F# on the Web

 Tachyus’ success with F#
 Data Access
 Web APIs
 Handling Exceptions
 Managing Builds
 Questions

 ASP.NET Web API hosted in Azure
 AngularJS-based SPA providing information to office
workers
 iOS application for workers in oil fields

 Less code
 Get things done faster
 Type safety
 Expressive syntax
 Full .NET compatibility
 Active, strong community (small but growing!)

 DbmlFile and SqlDataConnection (LINQ to SQL)
 EdmxFile and SqlEntityConnection (Entity Framework)
 SQL Provider
 FSharp.Data.SqlClient <- we use this one

“SQL is the best DSL for working with data”
- Rob Conery, http://www.infoq.com/articles/ORM-Saffron-
Conery

HttpRequestMessage -> HttpResponseMessage

Request/Response
 Methods, URIs, Status Codes
Headers (info on client, server, request type, etc)
 General, Request, Response, Content
Resources –
 “anything that has identity”–RFC2396

GET /item/1
+ POST /item/1
+ PUT /item/1
+ DELETE /item/1
+ OPTIONS /item/1
GET (or POST) /
+ /items
+ /item/{itemId}
+ /setresult?foo=bar
HTTP
Resource
HTTP
“Service”

 Serve functional Web APIs
 Consume HTTP with pattern matching

 F# DSL using System.Net.Http
 Headers composition
 Follows the natural composition of HTTP
 Frank Resources == HTTP Resources
 Define your own conventions!

HttpRequestMessage -> HttpResponseMessage
HttpRequestMessage -> Async<HttpResponseMessage>

// handler
let echo request = async {
let! body = request.Content.AsyncReadAsString()
return request.CreateResponse(HttpStatusCode.OK, body)
}
// method handler
get echo

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

let todoListResource = route “/” (get todoList <|> …)
let todoItemResource = route “/item/{1}” (put …)
config |> register [todoListResource;todoItemResource]

 Works out of the box using a F# library and C# web project
 F# MVC 5 project template
 Frank

 http://www.slideshare.net/ScottWlaschin/railway-oriented-
programming
 http://fsharpforfunandprofit.com/posts/recipe-part2/

“FAKE is a Domain Specific Language that you can use without knowing F#, but if
and when you outgrow it you can keep heading down the F# road. In all cases you've
got all of .NET at your command.”
- Scott Hanselman,
http://www.hanselman.com/blog/ExploringFAKEAnFBuildSystemForAllOfNET.asp
x

 WebSharper and FunScript – F# -> JavaScript compilers
 VegaHub – interactive charting from the F# interactive
window
 F# Web Stack – OWIN-based tools for building web APIs
 Work in progress to merge Frank + HyperF + Dyfrig + Taliesin

 F# Software Foundation
 Community for F#
 Sergey Tihon’s F# Weekly
 F# for Fun and Profit
 Real World Functional Programming on MSDN

F# on the Web

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Editor's Notes