.Net Foundation On .NET, 30 Jun 2020

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From YouTube: ASP.NET Core Series: Getting started with the Worker templates

Description

The Worker Service templates in ASP.NET Core provides a starting point for writing long running service apps.

In this episode, Brady Gaster to show us how we can get started with the Worker templates inside of Visual Studio.

[00:31] - What are the Worker templates?
[03:58] - Creating a new worker service in Visual Studio
[07:59] - Using the worker services in Docker

Background tasks with hosted services in ASP.NET Core
https://docs.microsoft.com/aspnet/core/fundamentals/host/hosted-services?WT.mc_id=ondotnet-c9-cephilli

.NET Generic Host
https://docs.microsoft.com/aspnet/core/fundamentals/host/generic-host?WT.mc_id=ondotnet-c9-cephilli

Host ASP.NET Core in Docker containers
https://docs.microsoft.com/aspnet/core/host-and-deploy/docker/?WT.mc_id=ondotnet-c9-cephilli

Azure Container Registry
https://docs.microsoft.com/azure/container-registry?WT.mc_id=ondotnet-c9-cephilli

#aspnet #dotnet #microservices

A

Hey in this episode of the all not net, show I'm gonna have my buddy Brady joining me and he's gonna show us all about the new worker templates that are inside of Visual Studio 2099, dot, nine core three Oh.

A

Everyone welcome to another episode of the on.net show, and today we have our my good buddy Brady, coming on who's. Gonna talk to us about worker templates. What are working templates.

B

What are working templates? Well, I've got a doc page pulled up. It's always a great place. To start. Doc's are a good place. Okay, so essentially a worker template is kind of whatever you want it to be. So in the past. If you had something like a like a web key worker type scenario where you've got a web app in the web, apps dropping stuff in a queue fast and.

A

You need a thing to process those messages and whatnot. That's.

B

What worker comes in got it some of the passion when I would probably write what like.

A

Like a Windows servers or.

B

Console console game console application, thomna console app, so essentially, this is kind of your file, new console application for the micro service. Folks, like you and I, if you need to write like a background service, the nice thing about this is we took all the stuff that we knew yes, peanut core developers loved about our dii OSI layer, a service wire up middleware, all that good stuff, and we said, let's do something that runs like a micro service runs like a spinner. My chrome spinners, like a spinner yeah.

A

B

Just like watch queue or feed messages, in my case, I use it to like generate test data.

A

Like I'm always running service right.

B

A

There's no none of the web stuff in it exactly.

B

There's well there's none of the web stuff, except for the hosting abstractions. So we've got like all the asp net core hosting abstractions, not necessarily the web host. You can dial then, and if you want to, but it's really just the host runtime to be able to do services dot ad transient, ed singleton, all the IOC, all the logging, everything that you know and love from asp.net core and we're working with other app model owners and the dotnet 5 wave to actually bring that type of experience to things like xamarin to.

A

Other to other app models.

B

So if you're into the DRI OC stuff, don't asp.net core concept of hosting or generic host you're going to see that popping up more and more yeah. So we did an interesting experiment with James Mont Magna, where we filed a new project to xamarin app and he actually used a worker. It.

A

B

A the worker template, but it was some of the core components. It was pretty exciting.

A

Really, and so then said on your xamarin, app now could have configuration you could have. Logging could have di could have all of those core features. All those core features see if I already know about those things from asp.net core yep right, like I, can put them in my console. App I can put it inside of my my mobile app, whatever exactly maybe even a Windows WP desktop.

B

A

Cross my fingers.

B

Yeah yeah we'll see what happens by November, okay.

A

B

Year's big wave so.

A

B

You want it, you can do dotnet new worker or, if you're inside Visual Studio. The way I am right now, I can just type in worker. um I, don't have any in there right now, because I want to do a new project. So I'll do a new project and that's someone I would do, is search for worker I'll. Do a search for worker right here, you'll see, there's the worker service and it sits right next to the container application for kubernetes, which.

A

B

Place for you to essentially use as your dev spaces to like kind of take the take the worker that you would otherwise have running locally on your computer and ship. It up, and you know, debug it in the cloud using something like has your dev spaces.

A

So quick question about this, though sure, so what do I have to do to get that simply you have.

B

To install dotnet, 300 or higher, that's.

A

B

It so once you have the dotnet, let's say you know, because you're running the latest stuff, if you have the latest store and I'm gonna, say I'm going to enable docker support and I'm gonna run in Linux. It's not probably running a Linux container, but once I have gotten a three you.

A

Have of I just have it you.

B

Just have the worker template in there and, like I said we were on my Mac I could do done a new worker and I have that capability or on Linux or any other platform where it runs, and you mention Windows services. We actually have a new get package so that you could install into say a worker project where you could make it run as a Windows service. So, instead of you having to go and create a new Windows service project, go back out to dotnet framework. Can.

A

B

All those same things in the middle, where it looks like everything else, I think it's you use Windows services or add with no.

A

B

So essentially, you get two files ones program see. Yes, if we were looking program, so yes, you'll see we're just creating the host builder and there were saying services, dot, add hosted service because all the workers inherit from wants to open the worker up here. Worker inherits from a class called background service. Yeah background service implements a very simple interface. If I can find get a definition, Oh.

A

B

A fire thank you, I'm, coming back to the yes, it's.

A

B

Been on a Mac for a little while you'll see that a it implements I hosted service here, so I've got start a sink and stop a sink. And then, since it is this background, service implementation I've got execute a sink and.

A

B

You were to take a look in the execute, a sink method. We sort of give you. You know just a little guidance here, just keep running. You know as long as somebody hasn't canceled this process just take a delay in this loop and just right. You know the workers running so I've got one that does a little more work pop over here. In this case, I've actually made use of bogus, which I think I might need to grab my license.

B

Key, that's going to be unfortunate, might not do what I needed to do, but I would have to grab my license key and put it in here. This may or may not run when I try to run it locally, but essentially what bogus is for is for generating bogus.

A

Data, you know generating bogus data so.

B

What I'm doing here is I'm actually generating gendering a random you know person and when I generate that random person I'm actually generating a latitude and longitude. This is the part that may in fact blow up if it does, when I run it locally, we'll turn that part off so I'm, just gonna hit remap mapped out generator, because that's all we're going to do is generating Maps map dots.

B

Now the idea that I wanted to bring you and going to be a show later on that I might do is if I were to flip over to our blog here, if I were to flip over to the blog over here, what you will see is that we have a new blog out talking about Blazer webassembly yeah.

A

B

This is like your client-side blazer type stuff and, if I were to scroll way down in here, you'll see a part. That's super exciting to myself and most of the other real-time army members, the signal our fans, yeah.

A

B

That now you have support inside of blazer wasm for supporting signal, Arnett, client.

A

Oh, very cool, yeah, that's very cool, so this is a this is.

B

A new thing people have been asking for a while, like I'm used to signal our Blazers exciting. Would it be great if I had my signal.

A

B

Our love blazer a little bit more, so we've done that in this release, so definitely encourage that you come out here and take a look at it. I'll keep working on this kind of scenario demo, because what I really want to do is have a background service, that's generating these random points and then sending them over to a signal or hub generating points on a map sure so hopefully that'll work. We actually go right here and you'll see that we are actually generating big data right.

A

Here, that's also just run.

B

Directly inside of my window, yeah.

A

B

I can hit exit and, if I wanted, to bring in the windows service, new gate and I could run that. There's a blog on our team blog about how to do that. There's also a blog I, don't know if Glenn's already written it, but if you're using the Linux system D, you can actually install a different new get that will support system D commands from within a worker as well. You.

A

B

Write out the system D now this point we really care about micro services. We care about cloud stuff. So what I want to do? Is you know kind of explain the really brief workflow for any container based developer? You know, building my image, which I don't have I. Have a docker file in here already I do not have a docker file, so I would just add docker support, so I right-click, my project here I. Do that all right, I, don't say! Oh, it's gonna manage my references. Apologies yeah.

A

But what I think is great about this is so we talked about. We could use system D services right. We can do windows services so like these are operating system controlled, exactly long, running opera, like events and things like that right right but like we could also use the same worker template for docker content for dr. damage. So we can talk about docker. We can talk about kubernetes. We.

B

A

About whatever orchestrating thing.

B

That you want to do exactly and if you've ever done anything with docker containers, you still have our get my docker file, the wonderful tools in BES. It helped help me to get my docker file here. Yeah.

A

B

What I would do at this point is I would right click this and we've added this great capability to be able to right click, publish and I know some folks, don't like right. Click publishing, but I want to clarify that what we're right click publishing here is our docker image and we're actually publishing it into a Azure container registry right now. The idea behind that is that's kind of my first step. I have to take my container and image. Put my container image into our registry yeah.

A

B

Then I can use it from within that registry to create an icy eye or to deploy to a neck AS cluster or whatever. I want to do here right. That's.

A

Very so much something like docker hub, that's exactly right! The docker hub is like a public instance exactly.

B

Ripes of things exactly this.

A

And I could go in doctoral, but I could search for like verified images from different companies.

B

Or Microsoft you could have some stuff exactly and.

A

If you wanted a private one right right that just my company and it's not exposed to the whole world on the Internet.

B

A

I could create some that's inside of Microsoft. It's.

B

Exactly Roger exactly and then you can use kind of our roll back access, security and controls and everything to.

A

B

Say you have access to this registry? You don't have access to it, etc, etc. So people can party on it while that's publishing, because I'm gonna flip over and do something kind of part two here in a minute, but before we do, if all of this cloud native stuff is important to you out there and viewer land, I want to call out that mr.

B

hunter and I are gonna, be in tech Arama in Belgium on a June 2nd at the 4th yeah we're gonna be giving a workshop on basically doing dotnet core and cloud and cloud native. Ok, so you would kind of see very practical guy just how to walk through all these things. We're not gonna get too theoretical, but there are some other great theoretical sessions that are gonna, be there.

B

I would encourage you to check them out and then, if you're gonna be going to dev intersection, we're gonna be doing the same workshop down in Orlando later on this year in April.

B

So basically, in this video you know, we've already shown you how to kind of get started with a worker template how to write click, publish it to a registry, which is your first step to deploying it we're going to come back in a minute once it's done publishing and do a second show on pushing it to as your container instances, and maybe the AKS yeah.

A

That's great yeah: let's do that so again in this video we learned a little bit how we can use those worker templates, so they're inside of Visual, Studio and dotnet core 302 create like some really interesting services and background running things, and now we're gonna follow up with another video where we're going to look at creating containers and also running that stuff inside of a sure and running it in the cloud.

A