Jamie Wright — Life is to live and learn

Branching Pipelines with OWIN

Published by Jamie Wright on January 16, 2020

Branching pipelines with OWIN allow for several different request pipelines to be used as needed depending on a determining factor. This factor is most often a Hostname but it could be any sort of toggle. An example might be authentication. Your system might need to allow for different authentication mechanisms for different users. The set up for authentication happens once when the app is built-in IIS for the first time and can be found in Startup.Auth. At this point the application hasn’t even received any requests so how is it supposed to know what authentication system to use? This is…

Programing IIS website configuration properties

Published by Jamie Wright on November 14, 2019

Where possible it is easiest to manage IIS web configuration properties for applications via the web config file, for ASP.NET web applications at least. However, while setting up automated deployments recently I came across a situation whereby the values in the <sessionState> needed to change per environment. I will point out that I think using session state is a bad idea but sometimes needs must. As I was using Octopus, my first approach was to “#{variable}” up the configuration. However, it soon became a pain to run locally as I had to consciously make sure that this wasn’t being overwritten…

Creating a dotnet core windows service

Creating a dotnet core windows service

Published by Jamie Wright on October 17, 2019

Services are great for performing reoccurring tasks, especially if the task needs to be repeated often, say every minute. They also have the benefit of not requiring anyone to be logged in to run the service. Luckily with dot net core, you can have one set up and running very easily with the help of TopShelf. To get started, create a new console application using the CLI. dotnet new console –name MyService Import the TopShelf NuGet into your .csproj file like so In your program file, configure and run a new service host. In the example below I create my…

Automated Deployments- An easy in with Octopus Deploy

Published by Jamie Wright on September 19, 2019

Great news! Octopus Deploy is now offering a starter edition for small teams free! You can find their announcement here. Why is this great news? One of the key things that I have come to learn in the last few years is the importance of slick operation management. Lots of companies like to band around the word DevOps – but really it just automating things for our own sanity. Octopus Deploy has become a key player in deployments and has made my life so much easier. Deployments are a single click (well, a few clicks in some cases) and take…

Health checks in .netCore web APIs

Health checks in .netCore web APIs

Published by Jamie Wright on July 16, 2019

Previously I have been writing health check controllers by hand. Now .netCore has a simple way of managing service health checks via middleware. You can test everything is operational all the way down to the database. You can even write your own custom checks in a few lines. A simple service operational health check can be enabled by adding two lines to your startup.cs file. One in the services configuration and one in the application configuration. The “/health” parameter specifies the route to be used for the health check. When navigating to the route, a message will be displayed on…

Running web apps in a Docker container

Running web apps in a Docker container

Published by Jamie Wright on July 11, 2019

Running web apps in a Docker container requires a little more set up than just running your standard back end services. This method requires that your app be wrapped by .netCore as recommended by Microsoft when creating a SPA. This allows you to deploy everything as a simple DLL. The only change that is required from a normal container deployment for a back end service is the container itself. Most front end frameworks these days use NodeJS. We either need to ensure that this is already installed on the container image we are using, or install it in the container.…

Kubernetes – Terminology

Published by Jamie Wright on July 10, 2019

If you haven’t worked with Kubernetes or any orchestration system before, starting can be a bit like jumping in the deep end of a pool. Most developers won’t have been exposed to the terminology spread throughout the product This can make figuring out what is going on all the more difficult. Below I have tried to give a simple high-level overview of the main components of Kube, and the relationships between them. The node This is a worker machine – or minion. This is usually a VM or physical piece of hardware and is where your programs are run. The…

NUnit test cases

NUnit test cases

Published by Jamie Wright on February 6, 2019

Testing multiple scenarios through the same function can be a bit of a time sink. Writing out a method for each scenario and just changing the data passed into the function then checking the output against the expected result. Steve Fenton showed me NUnit test cases the other day though which make running multiple permutations of data against a result set a breeze! They have been around a while I think, but I somehow missed that boat. See below for a simple example of how they work. The test above will check multiple combinations of inputs against the expected output…

Refactoring – Flocking rules

Refactoring – Flocking rules

Published by Jamie Wright on February 4, 2019

I have always been a fan of Sandi Metz, and have finally got around to her book 99 Bottles of OOP. A key takeaway so far from this has been the flocking rules for refactoring. The name derives from the small changes an individual bird makes in a flock that is then reflected by all the other birds so everyone ends up going in the right direction. The premise is fairly simple, make small incremental changes that only change a single thing a time. A lot of people think they do this already, however small is not small enough in…

C# Interfaces and default method implementations

C# Interfaces and default method implementations

Published by Jamie Wright on January 26, 2019

The upcoming C# 8.0 release came up the other day, or more specifically the inclusion of default implementations on interface methods. At first glance it seems akin to madness, blurring the line between implementation and inheritance. We already have abstract classes that cater for this, so why the need? Taking a little time to dig a little deeper though, and I think it does make sense and could be extremely powerful. The caveat being that it isn’t abused, which it most certainly could be. Using it looks to be pretty straight forward. You simply provide a method body on the…

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