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Rx Web Server Demo

Barebone Reactive Extensions web server demo.

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open System
open System.Net
open System.Text
open System.Reactive.Concurrency
open System.Reactive.Subjects
open System.Reactive.Linq
open FSharp.Control.Reactive

let makeObservableListener url =
    let listener = new HttpListener()
    listener.Prefixes.Add url
    listener.Start()
    let makeObservable =
        Observable.FromAsync(listener.GetContextAsync)
        |> Observable.repeat
        |> Observable.retry
        |> Observable.publish
        |> Observable.refCount
    (listener, makeObservable)

let handleRequest obs =
    obs
    |> Observable.filter (fun (ctx : HttpListenerContext) -> ctx.Request.Url.AbsolutePath.EndsWith("/hello"))
    |> Observable.subscribe (fun ctx ->
            let b = Encoding.UTF8.GetBytes("world")
            ctx.Response.OutputStream.Write(b, 0, b.Length)
            ctx.Response.Close())

[<EntryPoint>]
let main argv =
    let (lst, obs) = makeObservableListener "http://localhost:55555/"
    handleRequest obs |> ignore
    Console.ReadKey() |> ignore
    lst.Close()
    0
namespace System
namespace System.Net
namespace System.Text
namespace System.Reactive
namespace System.Reactive.Concurrency
namespace System.Reactive.Subjects
namespace System.Reactive.Linq
Multiple items
namespace FSharp

--------------------
namespace Microsoft.FSharp
Multiple items
namespace FSharp.Control

--------------------
namespace Microsoft.FSharp.Control
namespace FSharp.Control.Reactive
val makeObservableListener : url:string -> HttpListener * IObservable<'a>

Full name: Script.makeObservableListener
val url : string
val listener : HttpListener
Multiple items
type HttpListener =
  new : unit -> HttpListener
  member Abort : unit -> unit
  member AuthenticationSchemeSelectorDelegate : AuthenticationSchemeSelector with get, set
  member AuthenticationSchemes : AuthenticationSchemes with get, set
  member BeginGetContext : callback:AsyncCallback * state:obj -> IAsyncResult
  member Close : unit -> unit
  member DefaultServiceNames : ServiceNameCollection
  member EndGetContext : asyncResult:IAsyncResult -> HttpListenerContext
  member ExtendedProtectionPolicy : ExtendedProtectionPolicy with get, set
  member ExtendedProtectionSelectorDelegate : ExtendedProtectionSelector with get, set
  ...
  nested type ExtendedProtectionSelector

Full name: System.Net.HttpListener

--------------------
HttpListener() : unit
property HttpListener.Prefixes: HttpListenerPrefixCollection
HttpListenerPrefixCollection.Add(uriPrefix: string) : unit
HttpListener.Start() : unit
val makeObservable : IObservable<'a>
type Observable =
  static member Aggregate<'TSource> : source:IObservable<'TSource> * accumulator:Func<'TSource, 'TSource, 'TSource> -> IObservable<'TSource> + 2 overloads
  static member All<'TSource> : source:IObservable<'TSource> * predicate:Func<'TSource, bool> -> IObservable<bool>
  static member Amb<'TSource> : [<ParamArray>] sources:IObservable<'TSource>[] -> IObservable<'TSource> + 2 overloads
  static member And<'TLeft, 'TRight> : left:IObservable<'TLeft> * right:IObservable<'TRight> -> Pattern<'TLeft, 'TRight>
  static member Any<'TSource> : source:IObservable<'TSource> -> IObservable<bool> + 1 overload
  static member AsObservable<'TSource> : source:IObservable<'TSource> -> IObservable<'TSource>
  static member Average : source:IObservable<float> -> IObservable<float> + 19 overloads
  static member Buffer<'TSource, 'TBufferClosing> : source:IObservable<'TSource> * bufferClosingSelector:Func<IObservable<'TBufferClosing>> -> IObservable<IList<'TSource>> + 10 overloads
  static member Case<'TValue, 'TResult> : selector:Func<'TValue> * sources:IDictionary<'TValue, IObservable<'TResult>> -> IObservable<'TResult> + 2 overloads
  static member Cast<'TResult> : source:IObservable<obj> -> IObservable<'TResult>
  ...

Full name: System.Reactive.Linq.Observable
Observable.FromAsync(actionAsync: Func<Threading.CancellationToken,Threading.Tasks.Task>) : IObservable<Reactive.Unit>
Observable.FromAsync(actionAsync: Func<Threading.Tasks.Task>) : IObservable<Reactive.Unit>
Observable.FromAsync<'TResult>(functionAsync: Func<Threading.CancellationToken,Threading.Tasks.Task<'TResult>>) : IObservable<'TResult>
Observable.FromAsync<'TResult>(functionAsync: Func<Threading.Tasks.Task<'TResult>>) : IObservable<'TResult>
val repeat : source:IObservable<'Source> -> IObservable<'Source>

Full name: FSharp.Control.Reactive.Observable.repeat
val retry : source:IObservable<'Source> -> IObservable<'Source>

Full name: FSharp.Control.Reactive.Observable.retry
val publish : source:IObservable<'a> -> IConnectableObservable<'a>

Full name: FSharp.Control.Reactive.Observable.publish
val refCount : source:IConnectableObservable<'a> -> IObservable<'a>

Full name: FSharp.Control.Reactive.Observable.refCount
val handleRequest : obs:IObservable<HttpListenerContext> -> IDisposable

Full name: Script.handleRequest
val obs : IObservable<HttpListenerContext>
Multiple items
val filter : predicate:('T -> bool) -> source:IObservable<'T> -> IObservable<'T>

Full name: FSharp.Control.Reactive.Observable.filter

--------------------
val filter : predicate:('T -> bool) -> source:IObservable<'T> -> IObservable<'T>

Full name: Microsoft.FSharp.Control.Observable.filter
val ctx : HttpListenerContext
type HttpListenerContext =
  member Request : HttpListenerRequest
  member Response : HttpListenerResponse
  member User : IPrincipal

Full name: System.Net.HttpListenerContext
property HttpListenerContext.Request: HttpListenerRequest
property HttpListenerRequest.Url: Uri
property Uri.AbsolutePath: string
String.EndsWith(value: string) : bool
String.EndsWith(value: string, comparisonType: StringComparison) : bool
String.EndsWith(value: string, ignoreCase: bool, culture: Globalization.CultureInfo) : bool
Multiple items
val subscribe : onNext:('T -> unit) -> observable:IObservable<'T> -> IDisposable

Full name: FSharp.Control.Reactive.Observable.subscribe

--------------------
val subscribe : callback:('T -> unit) -> source:IObservable<'T> -> IDisposable

Full name: Microsoft.FSharp.Control.Observable.subscribe
val b : byte []
type Encoding =
  member BodyName : string
  member Clone : unit -> obj
  member CodePage : int
  member DecoderFallback : DecoderFallback with get, set
  member EncoderFallback : EncoderFallback with get, set
  member EncodingName : string
  member Equals : value:obj -> bool
  member GetByteCount : chars:char[] -> int + 3 overloads
  member GetBytes : chars:char[] -> byte[] + 5 overloads
  member GetCharCount : bytes:byte[] -> int + 2 overloads
  ...

Full name: System.Text.Encoding
property Encoding.UTF8: Encoding
Encoding.GetBytes(s: string) : byte []
Encoding.GetBytes(chars: char []) : byte []
Encoding.GetBytes(chars: char [], index: int, count: int) : byte []
Encoding.GetBytes(chars: nativeptr<char>, charCount: int, bytes: nativeptr<byte>, byteCount: int) : int
Encoding.GetBytes(s: string, charIndex: int, charCount: int, bytes: byte [], byteIndex: int) : int
Encoding.GetBytes(chars: char [], charIndex: int, charCount: int, bytes: byte [], byteIndex: int) : int
property HttpListenerContext.Response: HttpListenerResponse
property HttpListenerResponse.OutputStream: IO.Stream
IO.Stream.Write(buffer: byte [], offset: int, count: int) : unit
property Array.Length: int
HttpListenerResponse.Close() : unit
HttpListenerResponse.Close(responseEntity: byte [], willBlock: bool) : unit
Multiple items
type EntryPointAttribute =
  inherit Attribute
  new : unit -> EntryPointAttribute

Full name: Microsoft.FSharp.Core.EntryPointAttribute

--------------------
new : unit -> EntryPointAttribute
val main : argv:string [] -> int

Full name: Script.main
val argv : string []
val lst : HttpListener
val ignore : value:'T -> unit

Full name: Microsoft.FSharp.Core.Operators.ignore
type Console =
  static member BackgroundColor : ConsoleColor with get, set
  static member Beep : unit -> unit + 1 overload
  static member BufferHeight : int with get, set
  static member BufferWidth : int with get, set
  static member CapsLock : bool
  static member Clear : unit -> unit
  static member CursorLeft : int with get, set
  static member CursorSize : int with get, set
  static member CursorTop : int with get, set
  static member CursorVisible : bool with get, set
  ...

Full name: System.Console
Console.ReadKey() : ConsoleKeyInfo
Console.ReadKey(intercept: bool) : ConsoleKeyInfo
HttpListener.Close() : unit
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More information

Link:http://fssnip.net/s9
Posted:1 years ago
Author:Giacomo Stelluti Scala
Tags: web , networking , reactive extensions