davidglassborow

Homebrew Permissions Denied Issues Solution

Installing and fixing node.JS

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brew install node

davidglassborow

(*
An incomplete implementation of a type-safe SQL query in F#.

The idea is that a query is built up clause by clause, by representing
each additional clause being added on to the query as a state transition
between different types of queries. We capture these different types as
phantom types to make sure that only valid transitions (query clause
additions) as defined by us can be carried out.

The final result is a 'total query' that can be converted to a string,

davidglassborow

let ParallelThrottledIgnore (startOnCallingThread:bool) (parallelism:int) (xs:seq<Async<_>>) = async {
  let! ct = Async.CancellationToken
  let sm = new SemaphoreSlim(parallelism)
  let count = ref 1
  let res = TaskCompletionSource<_>()
  let tryWait () =
    try sm.Wait () ; true
    with _ -> false
  let tryComplete () =
    if Interlocked.Decrement count = 0 then

davidglassborow

let timeoutNone (timeoutMs:int) (a:Async<'a>) : Async<'a option> = async {
  let! ct = Async.CancellationToken
  let res = TaskCompletionSource<_>()
  use cts = CancellationTokenSource.CreateLinkedTokenSource ct
  res.Task.ContinueWith (fun _ -> cts.Cancel ()) |> ignore
  use timer = new Timer((fun _ -> res.TrySetResult None |> ignore), null, timeoutMs, Timeout.Infinite)
  Async.StartThreadPoolWithContinuations (
    a,
    (fun a -> res.TrySetResult (Some a) |> ignore),
    (fun e -> res.TrySetException e |> ignore),

davidglassborow

Tutorial: Designing a GraphQL API

This tutorial was created by Shopify for internal purposes. We've created a public version of it since we think it's useful to anyone creating a GraphQL API.

It's based on lessons learned from creating and evolving production schemas at Shopify over almost 3 years. The tutorial has evolved and will continue to change in the future so nothing is set in stone.

davidglassborow

$userPath = $env:USERPROFILE
$pathExclusions = New-Object System.Collections.ArrayList
$processExclusions = New-Object System.Collections.ArrayList

$pathExclusions.Add('C:\Windows\Microsoft.NET') > $null
$pathExclusions.Add('C:\Windows\assembly') > $null
$pathExclusions.Add($userPath + '\AppData\Local\Microsoft\VisualStudio') > $null
$pathExclusions.Add('C:\ProgramData\Microsoft\VisualStudio\Packages') > $null
$pathExclusions.Add('C:\Program Files (x86)\MSBuild') > $null
$pathExclusions.Add('C:\Program Files (x86)\Microsoft Visual Studio 14.0') > $null

davidglassborow

// F<'a> is any type with member 'map' of type ('a -> 'b) -> F<'a> -> F<'b>

type F<'a> = QIL<'a> 
and S<'a> = F<Q<'a>>
and Q<'a> =        
    private
    | Step of Step<'a>
    | Bind of IBind<'a>
    with
        static member lift (k : F<'a>) : Q<'a> = Step (Suspend (fun () -> S<_>.map (Yield >> Step) k))

davidglassborow

#r @"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\Microsoft.Solver.Foundation.dll"

module ZebraPuzzle =
    open System
    open Microsoft.SolverFoundation.Services

    let solve() =
        let context = SolverContext.GetContext()
        let rootModel = context.CreateModel()
        let person = rootModel.CreateSubModel("Person")

davidglassborow

var url = "http://localhost:8082/consumers/my_binary_consumer/instances/my_instance/topics/test";

using (var client = new HttpClient())
{
    client.Timeout = TimeSpan.FromMilliseconds(Timeout.Infinite);

    var request = new HttpRequestMessage(HttpMethod.Get, url);
    using (var response = await client.SendAsync(
        request, 
        HttpCompletionOption.ResponseHeadersRead))

davidglassborow

(*
Simulation of the Lorentz attractor, using Fable.
If you want to see this code in action, just copy this code into the Fable REPL:
https://fable.io/repl/
*)

module App

open Elmish
open Elmish.React