Breaking down monolothic systems into smaller components that are maintained by specific people in separate git repositories and distributed as NuGet packages is becoming the standard these days. But what if your component needs to expose some kind of HTTP end-point such as a WebAPI controller or an embedded management website? How do you host such a component in another system without affecting it's hosting model? This is were the Open Web Interface for .NET comes to the rescue. Even the next version of ASP.NET is completely based on OWIN hosting. In this session I'm going to explain you how to build OWIN middleware components and how to host these in an IIS website, a Windows Service or even in a command-line tool.

1. Knowledge.
People.
Solutions.
Building HTTP-based .NET components you can host
anywhere
Dennis Doomen (@ddoomen)
19-6-2015

2. About Me
2
• 18 years in this profession
• C++ origins but since 2001 dedicated to C# and .NET
• Loves TDD/BDD, DDD, Event Sourcing, CQRS, OO,
Design Patterns, Architecture, Scrum/XP/Kanban,
Application Lifecycle Management
• Occasional Speaker
• www.csharpcodingguidelines.com
• www.fluentassertions.com
• Find me here
• www.continuousimprover.com
• DZone MVB
• @ddoomen

3. Demo
The simplest OWIN demo possible

4. Client
IIS
Console
WinSvc
Unit Test
HTTP
request
HTTP
response
Middleware
env
handler
next
Middleware
IDictionary<string, object>
Func<IDictionary<string, object>, Task>
Task
Func<
Func<IDictionary<string, object>, Task>,
Func<IDictionary<string, object>, Task>
>
The OWIN Pipeline

5. Demo
Building a real component using
OWIN, NuGet, Psake, ILMerge, Swagger and Gitversion

6. 1. Simple console app
2. Ship as class library
3. Ship as NuGet package
4. Psake builds
5. GitFlow versioning
6. Convert to OWIN
7. OWIN-based testing
8. Swagger
9. Internalizing dependencies
10. Custom settings
Summary

7. Invaluable Resources
• Piercer demo code
https://github.com/dennisdoomen/piercer
• Katana / DNX 5 bridge
https://github.com/damianh/LimitsMiddleware/blob/dnx/src/LimitsMiddleware.AppBuilderExte
nsions/AppBuilderExtensions.ConnectionTimeout.cs
• Official OWIN gitter.im room
https://gitter.im/owin/owin
• Liblog – a logging framework for library devs
https://github.com/damianh/LibLog
• Psake
https://github.com/psake/psake
• GitVersion
https://github.com/ParticularLabs/GitVersion
• Swashbuckle – Swagger for .NET
https://github.com/domaindrivendev/Swashbuckle

8. How to find me?
8
• @ddoomen
• dennis.doomen@avivasolutions.nl
• www.continuousimprover.com
• www.csharpcodingguidelines.com
• github.com/dennisdoomen
• www.fluentassertions.com

9. 19-6-2015 @ddoomen

10. 19-6-2015
Thanks!

11. Knowledge. People. Solutions.