ASP.NET Internals
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Vitaly Baum @butaji ASP.NET MVC Internals
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Transcript of ASP.NET Internals
Vitaly Baum @butaji
ASP.NET MVC
Internals
> whoami
Vitaly Baum
Product Manager @ bright box
http://twitter.com/butaji
BACKGROUND
Web Application
MVC
What and How
Controller
How do I write Controllers?
How do requests come to Controller?
View
How does ViewEngine render views?
Why do I need to change ViewEngine?
AGENDA
QUESTIONS• Non-IIS
• Azure in production
• NoSQL
• NGINX
OK. MVC
MVC• Front Controller
An object that handles all requests
• Page Controller
An object that handles a request for a specific
page or action on a Web site
HTTP
HTTP
1. Request
2. Environment
3. Response
IIS• System.Web.dll
• IHttpHandler (extensions)
• IHttpModule (HttpApplication events)
using System;
using System.Web;
public class LoggingHttpModule : IHttpModule
{
public void Dispose() {}
public void Init(HttpApplication context)
{
context.BeginRequest += BeginRequest;
}
void BeginRequest(object sender, EventArgs e)
{
Logger.Instance.Log("Hi there!");
}
}
public class RequestHandler : IHttpHandler
{
public RequestHandler() { }
public bool IsReusable { get { return false; } }
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
context.Response.Write("{ id : 1 }");
}
}
ASP.NET MVC?
• Were implemented on HttpHandlers
• https://servicestack.net/features
• http://www.castleproject.org/projects/monorail/
• http://mvc.fubu-project.org
IIS + ASP.NET• Highly coupled
• Hard to manage (ain’t my job)
• New features only with OS updates
a. Web Server
b. Middleware
c. Application
SERVER INTEROP
• authentication
• cookies
• authorization
• output caching
• localisation
• request servicing (app)
MIDDLEWARE
SERVER INTEROP• Rack (ruby)
• WSGI (Python)
• Node.js
• OWIN (.NET)
require 'rack'
app = Proc.new do |env| # ENV HASH[
'200', # HTTP CODE{'Content-Type' => 'text/html'}, ['A barebones rack app.’] # BODY
]end
Rack::Handler::WEBrick.run app
MIDDLEWARE
var http = require('http');
var server = http.createServer(function (req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.end('Hello World\n');
})
server.listen(1337, '127.0.0.1');
MIDDLEWARE
var express = require('express')var app = express()
app.use(function (req, res, next) {console.log('Time:', Date.now());next();
});
MIDDLEWARE
//OWIN Implementation
using AppFunc = Func<
IDictionary<string, object>,
Task
>;
MIDDLEWARE
OWIN
public class Startup{
public void Configuration(IAppBuilder app){
app.Run(context => {return context
.Response.WriteAsync("Hi OWIN/Katana");});
}}
ASP.NET MVC
ASP.NET MVC LIFECYCLERouting
UrlRoutingModule -> IRouteHandler ->
IHttpHandler
Controller
Execute -> Filters -> Model Binding -> Action
Action
Your Code
Result
Views -> TypeFormater
ROUTE HANDLER
public class MyRouteHandler : IRouteHandler{
public IHttpHandler GetHttpHandler(RequestContext requestContext)
{var handler = new MyMVCHandler();handler.RequestContext = requestContext;return handler;
}}
ROUTE HANDLER• In case of dynamic routes
• CMS
• Blog with custom Slugs
MVC HANDLERpublic class MyMVCHandler : MvcHandler{
protected override void ProcessRequest(IHttpContexthttpContext)
{var controllerName = GetRequiredString(this.RequestContext.RouteData, "controller");
var controller = CreateController(controllerName);var controllerContext = new
ControllerContext(base.RequestContext, controller);controller.Execute(controllerContext);
}private IController CreateController(string controllerName){
return _controllerFactory.Create(controllerName);}
}
DEPENDENCY MGMT
public class CustomControllerFactory : IControllerFactory{public IController CreateController(RequestContext
requestContext, string name){
return _serviceLocator.Resolve<IController>(name);}}
DEPENDENCY MGMT//ASP.NET vNext has new way to inject dependencies
public class Startup{public void Configure(IBuilder app){var services = new ServiceCollection();services.AddTransient<IMessageGenerator,
HelloMessageGenerator>();
app.UseMiddleware(typeof(ContainerMiddleware));}
}
OK. CTRL
CONTROLLERFAT VS SKINNY
CONTROLLER[HttpPost, ActionName("Delete")]public async Task<ActionResult> DeleteConfirmed(int id){var album = await _storeContext.Albums.FindAsync(id);if (album == null){return HttpNotFound();
}
_storeContext.Albums.Remove(album);await _storeContext.SaveChangesAsync();
return RedirectToAction("Index");}
CONTROLLER
[HttpPost, ActionName("Delete")]public async Task<ActionResult> DeleteConfirmed(int id){
var removed = await _albumService.Remove(id);
return Status.NotFound == removed.Status? HttpNotFound(): RedirectToAction(“Index");
}
CONTROLLER
//vNext can host POCOs controllerspublic List<Data> GetData(){return null; //will return 204 (NoContent)
}
def {action_name}( {params} )
app_res = {domain_service}.{call}( {params} )
return app_res
end
OK. VIEW
SEO OF SPA
SEO OF SPAMIDDLEWARE
Middleware
ApplicationGET /
User-Agent: Chrome
GET /
User-Agent: Google
JSON
Middleware
Application
GET /
User-Agent: Google
GET /
User-Agent: ChromeHTML
SEO OF SPASHARED TEMPLATES
SHARED TEMPLATES
Server Client
Template
{{#repo}}
<b>{{name}}</b>
{{/repo}}
{
"repo": [
{ "name": "resque" },
{ "name": "hub" },
{ "name": "rip" }
]
}
<b>resque</b>
<b>hub</b>
<b>rip</b>+ =
YET ANOTHER TEMPLATE
VIEW ENGINEpublic interface IViewEngine{
ViewEngineResult FindPartialView(ControllerContext ctx, stringname, bool useCache);
ViewEngineResult FindView(ControllerContext ctx, string viewName, string masterName, bool useCache);
void ReleaseView(ControllerContext ctx, IView view);}
public interface IView{void Render(ViewContext ctx, TextWriter writer);
}
http://buildstarted.com/2013/12/16/javascript-view-engine-for-aspnet/
VIEW ENGINE
services.AddMvc().Configure<MvcOptions>(options =>{
options.ViewEngines.Add(new MyCustomerViewEngine ());
});
COVERED TOPICS
Web Application
MVC
What and How
Controller
How do I write Controllers?
How do requests come to Controller?
View
How does ViewEngine render views?
Why do I need to change ViewEngine?
THANK
YOUVitaly Baum
@butaji
