#CampusDays

OWIN & Composable Web Apps

About me

Christian Horsdal

Independent Consultant

www.horsdal-consult.dk

c.horsdal@gmail.com

@chr_horsdal

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Flexible

Componentized

Reusable

Testable

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DemoHello OWIN World

Web Applications Handle HTTP Requests

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6

Handler

Log request

Log response

Authenticate

Open DbContext

Close DbContext

Things You Might Do In the Pipeline

Open & dispose resources

Logging

Authentication

Authorization

Quick monitoring endpoints

Sanitize inputs

Content Negotiation

CORS

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Things You Might Do In the Pipeline

Open & dispose resources

Logging

Authentication

Authorization

Quick monitoring endpoints

Sanitize inputs

Content Negotiation

CORS

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Cross-cutting concerns

Re-use

Test separately

Update separately

Distribute separately

Do One Thing And Do It Well

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Compose Pipeline However You Want

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Handler

Log request

Log response

Authenticate

Open DbContext

Close DbContext

Minify HTML

OWIN

OWIN

• Open Web Interfaces for .NET

• Community driven standard

• Defines mechanics of pipeline

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OWIN Terminology

Server

• The web server

•And/or an OWIN adapter

Middleware

• Those pieces in the pipeline

Application

• The handler

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No shared assembly

OWIN Terminolgy 16

using AppFunc = Func<IDictionary<string, object>, Task>;

OWIN – Request Environment

Key Name

"owin.RequestBody"

"owin.RequestHeaders"

"owin.RequestMethod"

"owin.RequestPath"

"owin.RequestPathBase"

"owin.RequestProtocol"

"owin.RequestQueryString"

"owin.RequestScheme"

OWIN – Response Environment

Required Key Name

Yes "owin.ResponseBody"

Yes "owin.ResponseHeaders"

No "owin.ResponseStatusCode"

No "owin.ResponseReasonPhrase"

No "owin.ResponseProtocol"

OWIN Terminology 19

using MidFunc = Func<AppFunc, AppFunc>;

Handler

Log request

Log response

Authenticate

Open DbContext

Close DbContext

OWIN “Terminolgy” 20

using BuildFunc = Action<MidFunc>;

No shared assembly

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DemoWrite an OWIN Middleware

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OWIN and Web Frameworks

Compatible Frameworks

• ASP.NET MVC 6

• WebApi

• Nancy

• Simple.Web

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ASP.NET 5 26

public class Startup{

public void Configure(IApplicationBuilder app){app.UseOwin();

}}

ASP.NET < 5 + Katana 27

public class Startup{

public void Configuration(IAppBuilder builder){

builder.Use(new MidFunc(next => (AppFunc)Invoke));}

public Task Invoke(IDictionary<string, object> environment) {…

}}

Katana 28

public class Startup{

public void Configuration(IAppBuilder app){app.Run(Invoke);

}

public Task Invoke(IOwinContext context){context.Response.ContentType = "text/plain";return context.Response.WriteAsync("Hello World");

}}

WebApi + Katana 29

Katana startup.cs code

public class Startup{public void Configuration(IAppBuilder builder){

HttpConfiguration config = new HttpConfiguration();config.Routes

.MapHttpRoute("Default", "{controller}/{id}",new { controller = "Home", id = RouteParameter.Optional

config.Formatters.XmlFormatter.UseXmlSerializer = true;config.Formatters.Remove(config.Formatters.JsonFormatter);

builder.UseWebApi(config);}

}

OWIN Testing

Integration test the complete pipeline

Integration test parts of the pipeline

While in process

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Handler

Log request

Log response

Authenticate

Open DbContext

Close DbContext

Minify HTML

#C

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DemoUse our middleware with an app

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#C

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pusD

ays

Flexible

Componentized

Reusable

Testable

Christian Horsdal

@chr_horsdal

www.horsdal-consult.dk

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