fsharp(todolist-api): refactor: refactored to use Chiron for json stuff

Signed-off-by: prescientmoon <git@moonythm.dev>

fsharp/todolist-api/paket.dependencies

@@ -8,3 +8,4 @@ nuget Suave
 nuget SQLProvider
 nuget Npgsql
 nuget FSharpPlus 1.1.0-CI00272	
+nuget Chiron

fsharp/todolist-api/paket.lock

@@ -2,6 +2,15 @@ STORAGE: NONE
 RESTRICTION: == netcoreapp3.1
 NUGET
   remote: https://api.nuget.org/v3/index.json
+    Aether (8.3.1)
+      FSharp.Core (>= 4.3.4)
+    Chiron (6.3.1)
+      Aether (>= 8.2)
+      FParsec (>= 1.0.3)
+      FSharp.Core (>= 4.3.4)
+    FParsec (1.0.3)
+      FSharp.Core (>= 4.2.3)
+      NETStandard.Library (>= 1.6.1)
     FSharp.Core (4.7)
     FSharpPlus (1.1.0-CI00272)
       FSharp.Core (>= 4.6.2)

fsharp/todolist-api/paket.references

@@ -3,3 +3,4 @@ Suave
 SQLProvider
 Npgsql
 FSharpPlus
+Chiron

fsharp/todolist-api/src/App.fs

@@ -7,20 +7,20 @@ open Suave
 open Suave.Operators
 open Suave.Successful
 open Suave.RequestErrors
-open Suave.Json
 open Suave.Filters
+open Chiron
 
 module Utils = 
     open System.Text
     open Db.Types
 
-    let jsonToString json = json |> toJson |> Encoding.UTF8.GetString
-
     let todoToRecord (todo: DbTodo) =
         { id = todo.Id
           description = todo.Description
           name = todo.Name }
           
+    let parseJson (input: byte array) = input |> Encoding.UTF8.GetString |> Json.parse |> Json.deserialize
+
 module App =
     open Utils
     open Db
@@ -34,12 +34,12 @@ module App =
         | None -> id |> sprintf "Cannot find todo with id %i" |> NOT_FOUND 
 
     let todoById = 
-        (fun (inner, _, _) -> inner |> todoToRecord |> jsonToString |> OK)  |> withTodoById
+        withTodoById (fun (inner, _, _) -> inner |> todoToRecord |> Json.serialize |> Json.format |> OK)
 
     let updateTodo =
-        (fun (todo, dbContext, id) ->
+        withTodoById (fun (todo, dbContext, id) ->
             fun ctx -> async {
-                    let body: Types.TodoDetails = ctx.request.rawForm |> fromJson
+                    let body: Types.TodoDetails = parseJson ctx.request.rawForm
 
                     do! Queries.updateTodosById todo body dbContext
 
@@ -49,10 +49,11 @@ module App =
                         id = id
                     } 
 
-                    let withNewBody = newBody |> toJson |> ok
-                    return! withNewBody ctx
+                    let writeBody = newBody |> Json.serialize |> Json.format |> OK
+
+                    return! writeBody ctx 
                 }        
-        ) |> withTodoById
+        ) 
 
     let mainWebPart: WebPart = choose [
         GET >=> pathScan "/todos/%i" todoById

fsharp/todolist-api/src/Db.fs

@@ -15,27 +15,44 @@ module Context =
 
 module Types =
     open Context
-    open System.Runtime.Serialization
+    open Chiron
 
     type DbTodo = DbContext.``public.todosEntity``
 
 
-    [<DataContract>]
     type Todo =
-        { [<field:DataMember(Name = "id")>]
-          id: int
-          [<field:DataMember(Name = "description")>]
+        { id: int
           description: string
-          [<field:DataMember(Name = "name")>]
           name: string }
 
+        static member ToJson(todo: Todo) =
+            json {
+                do! Json.write "name" todo.name
+                do! Json.write "description" todo.description
+                do! Json.write "id" todo.id
+            }
+
+        static member FromJson(_: Todo) =
+            json {
+                let! name = Json.read "name"
+                let! description = Json.read "description"
+                let! id = Json.read "id"
+
+                return { name = name
+                         description = description
+                         id = id }
+            }
 
-    [<DataContract>]
     type TodoDetails =
-        { [<field:DataMember(Name = "description")>]
-          description: string
-          [<field:DataMember(Name = "name")>]
+        { description: string
           name: string }
+        static member FromJson(_: TodoDetails) =
+            json {
+                let! name = Json.read "name"
+                let! description = Json.read "description"
+                return { name = name
+                         description = description }
+            }