Sergey Tihon's Blog

F# Weekly #34,#35,#36, 2015

06/09/201506/09/2015F# Weekly3 Comments

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

List of F# community heroes for 2015
Jet. Realtime Pricing, Realtime Advertising
New MOOC: Programming in F#.
F# Gotham is coming…
Visual F# PowerTools now support lightweight interface implementation
Argu – a declarative CLI argument/XML configuration parser for F# applications
Suave.IO‏ : Hello World OWIN & Hello World, Nancy!
FsLab Visual Studio template now supports VS 2015.
“Machine Learning Projects for .NET Developers” is finally available on Amazon
Paket 2.0 will introduce “Groups” and “Analyzers“
Announcing Availability of ASP.NET 5 Beta7
Mono 4.2.0 is released

Videos/Presentations

Suave from Scratch with Henrik Feldt
Fake+Paket With Steffen Forkmann
10 Ways of Getting Started with F# – Tomas Petricek
5th Anniversary – Manipulating Data Trees in Fungible with Rick Minerich
Fsharp – Kolja Dummann
Обзор F# 4.0 – Дмитрий Власов (slides)
Introdução ao F# – Fabiano Arruda
FSharp On The Desktop – Birmingham FP 2015 – Phillip Trelford
Datatype Generic Programming in F# – Ernesto Rodriguez ,Wouter Swierstra

Blogs

Recursive types, catamorphisms and folds – Scott Wlaschin
Real-time analytics with Apache Storm – now in F# – Eugene Tolmachev
F# – Flexera FNOC WCF with Basic Auth – Ramón Soto Mathiesen
F# Card Game Part 2 – Dealing Cards – Reid Evans
Error: Successive arguments should be separated by spaces or tupled – Reid Evans
YC.PrettyPrinter vs Microsoft.Text.StructuredFormat
When x, y, and z are great variable names – Mark Seemann
Try WebSharper: snippet versioning, gist import, and other enhancements now available – Adam Granicz
Computation expression approach for calling REST API – Kimserey Lam
New tools allow Microsoft’s functional language to work better with Visual Studio – Paul Krill
F# Friday – The List.append Function – Brad Collins
_____101 |> F# Coding Ecosystem: Paket && Atom w/ Paket – Λdrøn
Wake County Voter Analysis Using FSharp, AzureML, and R – Jamie Dixon
Single page application in F# with WebSharper UI.Next – Kimserey Lam
F# Light Changes and Features – Heather
Hackatron Prime – Mark Gray
FSharpArm – part 2 – Frank Joppe
Code Reuse with the SqlProgrammabilityProvider – Reid Evans
F# Friday – The Seq.take and Seq.truncate Functions – Brad Collins
Canopy : Automate your browser tests the F# way! – Antoine Sauvinet
Facebook Api Using F# – Jamie Dixon
Live F# coding and snippets with dependencies in Try WebSharper – Adam Granicz
F# – Monty Hall problem – Yan Cui
Best game programming books – Laurent Lepinay
Exercises in Programming Style–Style 1 – Yan Cui
Where did the Functional Languages come from? – FunctionalWorks
“Getting” Functional Programming – Steve Gilham
Decomposition Problem with F#, Dynamic Programming – Boris
Stateless services on Azure Service Fabric in F# – Isaac Abraham
Wake County Voter Analysis Using FSharp, AzureML, and R – Jamie Dixon
Swagger for F# Web Apps – Sergey Tihon
Important Languages You’ve Never Heard Of – Jeff Cogswell
Random Art – Phillip Trelford

F# vNext News

New releases

fszmq 12.1.1
FAKE v4.3.6 (“soft dependencies”, TFS and VisualStudioOnline support, FluentMigrator)
F# Azure Storage Type Provider 1.3.0
SourceLink.Fake 1.1.0
Logary 3.4.1
WebSharper 3.4.14
FSharp.RDF 1.1.4
FSharp.Qualia 0.1.4
CoreTweet.FSharp 0.5.3
F# mode for Emacs 20150902.732
atom-fsharp 0.13.0

That’s all for now. Have a great week.

Previous F# Weekly edition – #33

Swagger for F# Web Apps

06/09/201506/09/2015F#15 Comments

Swagger is a simple yet powerful representation of your RESTful API. With the largest ecosystem of API tooling on the planet, thousands of developers are supporting Swagger in almost every modern programming language and deployment environment. With a Swagger-enabled API, you get interactive documentation, client SDK generation and discoverability.

Swagger is very powerful framework that is able to generate schema and rich UI for your RESTful API. As I know, Swagger is very popular framework especially in the non-.NET world. You probably have already seen Swagger UI (like this) at several resources.

It turns out that it is not hard to use Swagger for .NET F# apps. There is a project called Swashbuckle, which adds Swagger to WebApi projects.

First of all, you need to create F# ASP.NET Web API project. You can do it using “F# Web Application templates (MVC 5 and Web API 2.2) by Ryan Riley and Daniel Mohl“. Choose “Web API 2.2 and Katana 3.0” option in project creation wizard.

So, now you have F# Web App with RESTful API: CarsController with two services ‘/api/cars‘ and ‘/api/car/{id}‘. Everything is awesome but we do not have UI that is able to show a list of available services, their parameters and return types. Swashbuckle will help us here, we need to install ‘Swashbuckle.Core‘ package to our web app.

Install-Package Swashbuckle.Core

The last step is to update HttpConfiguration in Startup.fs in proper way to register Swagger. Add following three lines to the end of RegisterWebApi method.

open Swashbuckle.Application

type Startup() =
    static member RegisterWebApi(config: HttpConfiguration) =
        // ...
        // Swagger configuration
        config
          .EnableSwagger(fun c -> c.SingleApiVersion("v1", "My API") |> ignore)
          .EnableSwaggerUi();

That’s all! When you start your web application and open ‘/swagger/ui/index‘ URI you will see beautiful documentation for your RESTful API.

Real-time analytics with Apache Storm – now in F#

18/08/201518/08/2015F#1 Comment

I think, therefore I spam.

Over the past several month I’ve been prototyping various aspects of an IoT platform – or more specifically, exploring the concerns of “soft” real-time handling of communications with potentially hundreds of thousands of devices.

Up to this point, being in .NET ecosystem I’ve been building distributed solutions with a most excellent lightweight ESB – MassTransit, but for IoT we wanted to be a little closer to the wire. Starting with the clean slate and having discovered Apache Storm and Nathan’s presentation and I realized that it addresses exactly the challenges we have.

It appears to be the ultimate reactive microservices platform for lambda architecture: it is fairly simple, fault tolerant overall, yet embracing fire-n-forget and “let it fail” on the component level.

While Storm favours JDK for development, has extensive component support for Java developers and heavily optimizes for JRE components execution, it also supports “shell” components via its multilang protocol. Which is what, unlike Spark…

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F# Weekly #33, 2015

16/08/201516/08/2015F# Weekly1 Comment

Welcome to F# Weekly,

Note that F# Weekly goes to summer holidays under the gentle Spanish sun. The next edition of F# Weekly will be published on the first of September.

A roundup of F# content from this past week:

News

Videos/Presentations

F# Type Providers: The Current State – Sergey Tihon
JVMLS 2015 – Compilers are Databases – Martin Odersky

Blogs

Algebraic type sizes and domain modelling – Scott Wlaschin
Choosing between collection functions: A guide for the perplexed – Scott Wlaschin
F#, REPL Driven Development, and Scrum – Jamie Dixon
Building Azure Service Fabric Actors with F# – Part 2 – Isaac Abraham
Type Driven Development: composition – Mark Seemann
Generating emoji art using F# – Alex Humphrey
Going Functional : Merge and Quicksort in F# – Pawan Mishra
Bulk Updating S3 Files in F# with AWS .NET SDK – Cody Sand
Functional Programming vs OOP – Mike Mogosanu
Introducing FunSharp – Phillip Trelford
Unit Testing Your Xamarin Forms Applications With F# And FsUnit – Jon Wood
F# Card Game Part 2 – Dealing Cards – Reid Evans
Evaluating mathematical expressions by hand with F# – Ronnie Holm
F# Friday – Pattern Matching, Part 4: Active Patterns – Brad Collins

F# vNext News

The last 11 commits to the Visual F# repo were from 11 different contributors living in 9 different countries.
RyuJIT Bug Advisory in the .NET Framework 4.6
Recently proposed ideas:
- Have String.ofSeq in the standard library
- Have String.ofList in the standard library

New releases

That’s all for now. Have a great week.

Previous F# Weekly edition – #32

F# Weekly #32, 2015

09/08/201509/08/2015F# Weekly5 Comments

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

Videos

Paulmichael Blasucci on Practical Property-Based Testing with FsCheck and F#
Fixxup(2015,5): Introduction to F# – Fanie Reynders
Currying in a Hurry – Jeremy Abbott
A Gentle Introduction to Multi-stage Programming? – Walid Taha
Datatype Generic Programming in F# -Ernesto Rodriguez & Wouter Swierstra

Blogs

Understanding map and apply – Scott Wlaschin
Reinventing the Reader monad – Scott Wlaschin
Language Safety Score, revisited – Mathias Brandewinder
FSharpArm – part 1 – Frank Joppe
Retro: The Weekly Source Code 34 – The Rise of F# – Scott Hanselman
Partial Lenses in F# – Daniel Fabian
Building Azure Service Fabric Actors with F# – Part 1 – Isaac Abraham
WebSharper UI.Next 3.4: the new HTML syntax – Loïc Denuzière.
F# 4.0 Released for All Platforms – Jeff Martin
Why would anyone choose F# – Mark Gray
.NET Cloud Computing with Alea GPU -Daniel Egloff
Comparing Hash Times – Steve Hawley
F# deep dives preliminary thoughts – rahul garg
IIS Administration using Microsoft.Web.Administration using F# – Dominic Finn
New WebSharper templates – Adam Granicz
Parsing mathematical expressions by hand with F# – Ronnie Holm
F# Card Game Part 1 – Modeling the Domain – Reid Evans
F# Friday – Pattern Matching, Part 3: Discriminated Unions -Brad Collins
How to create an Akka.NET cluster in F# -Bartosz Sypytkowski

F# vNext News

New releases

That’s all for now. Have a great week.

Previous F# Weekly edition – #31

Building Azure Service Fabric Actors with F# – Part 1

03/08/201503/08/2015F#1 Comment

The Cockney Coder

This post is the first part of a brief overview of Service Fabric and how we can model Service Fabric Actors in F#. Part 1 will cover the details of how to get up and running in SF, whilst Part 2 will look at the challenges and solutions to modelling stateful actors in a OO-based framework within F#.

What is Service Fabric?

Service Fabric is a new service on Azure (currently in preview at the time of writing) which is designed to support reliable, scalable (at “hyper scale”) and maintainable distributed applications and services – with automatic support for things like replication of state across nodes, automatic failover & recovery and multi tenanting services on the same instances. It supports (currently) both stateful and stateless micro-services and actor model architectures (more on this shortly). The good thing about Service Fabric (SF) from a risk/reward point of view is that it’s…

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