Created
April 28, 2017 02:37
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Suave userData persisting with keep-alive
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open Suave | |
open Suave.Filters | |
open Suave.Operators | |
open System | |
module View = | |
let page (data : Map<string, obj>) = | |
match data |> Map.tryFind "messages" with | |
| Some x -> | |
x :?> string list |> List.reduce (+) | |
| _ -> "" | |
let readUserState ctx key : 'value = | |
ctx.userState |> Map.tryFind key |> Option.map (fun x -> x :?> 'value) |> Option.get | |
let addUserMessage (message : string) : WebPart = | |
context (fun ctx -> | |
let read = readUserState ctx | |
let existing = | |
match ctx.userState |> Map.tryFind "messages" with | |
| Some msgs -> | |
read "messages" | |
| _ -> | |
[] | |
Writers.setUserData "messages" (message :: existing)) | |
let app = | |
choose [ | |
path "/" | |
>=> addUserMessage "Message One" | |
>=> addUserMessage "Message Two" | |
>=> context (fun ctx -> Successful.OK (View.page ctx.userState)) | |
//>=> Writers.unsetUserData "messages" | |
] | |
[<EntryPoint>] | |
let main argv = | |
Web.startWebServer Web.defaultConfig app | |
0 |
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<Project Sdk="FSharp.NET.Sdk;Microsoft.NET.Sdk"> | |
<PropertyGroup> | |
<OutputType>Exe</OutputType> | |
<TargetFramework>netcoreapp1.1</TargetFramework> | |
</PropertyGroup> | |
<ItemGroup> | |
<Compile Include="Program.fs" /> | |
</ItemGroup> | |
<ItemGroup> | |
<PackageReference Include="FSharp.Core" Version="4.1.*" /> | |
<PackageReference Include="FSharp.NET.Sdk" Version="1.0.*" PrivateAssets="All" /> | |
<PackageReference Include="Suave" Version="2.1.0" /> | |
</ItemGroup> | |
</Project> |
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