Red Hat OpenShift Behind the scenes | OpenShift Commons, 18 Sep 2018

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From YouTube: Dancing with Ballerina: A Conversation with Lakmal Warusawithana (WSO2)

Description

Behind the Scenes at OpenShift Commons with Michael Hausenblas (Red Hat)

In this session, Michael interviews Lakmal Warusawithana,
Senior Director, Cloud Architecture at WSO2 about Ballerina. Ballerina is a new programming language that is designed to bring code-first agility to the challenge of integrating across endpoints. Ballerina has first-class support for distributed transactions, circuit-breakers, stream processing, data-access, JSON, XML, gRPC, and many other integration challenges. It deploys directly onto Docker and Kubernetes. It integrates with common IDEs including IntelliJ and Visual Studio Code.

A

Well, welcome to another episode of behind the scenes, and today we have a very special guest to LACMA from the wonderful ballerina team and I'm super excited to have you on the show, I'm really interested in all cloud native programming languages, this new paradigm, getting you know young, yellow to torture, communities so hello and welcome. What are you doing.

B

Hi Michael what they like to the machine awesome.

A

Great to have you, can you tell us a little bit about yourself? Where would you come from? What's what's your background, what if you feel up to yeah.

B

Yeah so I mainly going to whoops for last 15 years, I'm just aggressive.

B

So mainly I have working on the operation and the crowd, and mainly the containers, crustacean system, like Papa Cobra case so know, mainly the DevOps like that. Okay, so.

A

We're going to talk about ballerina right, so what's what is battery oh yeah.

B

So bad is a cloud native Protima language. It is compiled typesafe concurrent to read complete full h, and so it has first-class support for the like micro services in point and lot of resiliency like circuit, breaker, retry or slowed balancing and some data types like kids.

B

Oh, come on the first-class support in the burner language, so I will talk about the Iroquois.

B

B

Would say: okay turn on it means light. You can directly deploy by now program into toca of kubernetes.

B

While compiling the program? Okay, so it's a full-fledged programming language.

A

So before we get into it, what would be my motivation? Like imagine I'm, you know, I'm committed this user or you know developer whatever um and I'm a yellow engineer right so all day long I'm, editing, yellow files and to cuddle it fly and whatnot. Why would I bother to even look at Valerie? Why? Why would I do that? Okay,.

B

Want to do that? Yes, exactly so, so, when you look at the current application web cycle, so developer will write the application in they will with the boundaries. Then they create a new profiles to build it. Okay images, then they will write the kubernetes ml for deployment. So he says they have to create this Yamahas manually or have used some different tools and then they will they need to give Croatian it's a coconut is so if you look at that, the flow is disrupting the developers flow. So developer has to go away from there.

B

They are your development tool, mainly like IDs, and they have used different tools to generate this hooker fire, stuff images and ever buys. So when you come to ballerina so Purina has this compiled expansion so for the company next create like a deployment artifact like doc images. Communication must a while building the application is safe. So then the from the developers perspective they no need to.

B

Manually write these descriptors or EML files. They can just focus on the application. Development and Maryna generate all this artifact and it will easy to deploy on top of poverty. It's like I could oversee systems.

A

Wow that sounds awesome cool. Do you think it would be actually possible to see that in action like with you, like you know, do a screen share and actually show us something. Sorry.

B

Sorry that kind.

A

Of jump on that, but I really love to see that yes,.

B

I mean you know straight how you can do like up by now. Maybe it started hello world and then we deploy it into. The coconut is awesome.

B

And also wanting to Spain so also very nice, like specialize in the indications like if you look at the modern applications, if you look at the 15 years back, so we wrote like standard applications like then just a few network costs involved with our application, but the current modern applications. We have to have connect with different ApS different endpoint process, API endpoints for different devices, even if I UT, this popular every device can be programmable endpoint.

B

So if you look at the current, like application development hit by a lot of network communication, then the so when you create a ticket soon, we have how to indicate all these other endpoints to make a usable application. Then the network resilience is a main part of our application now. So so all these things like Bernie into the language itself and make it developer life easier to develop my first micro service and then they can easily deploy it. If the committees kind of systems.

B

Let me share my Skinner right.

B

A

Yeah I can see that. Okay, can you maybe enlarge you fund a little bit just you know what yeah I just.

A

B

That's perfect, yeah, okay, so, let's start with the empty file. Basically I call it demo dot, bail, all right so I'm, using a risk or choice.

A

Good choice here, yeah I, like it already.

B

So I have set up my screen like a below I. Have two shell commands to demonstrate some functionality so I have installed latest beta release is a 0.98 one release so I will so marina has come up comes with like services come as the first first-class support, so I will going to create a service like I, think I'm good, create a HTTP service. Basically, so I will import HTTP library come see under the ballerina, so I'm going to.

A

Quickly interrupt you right here so you're using this code, which is as I said great and it looks like you have some kind of. Is there like a plug-in or some like it's yes to pick up what you're doing there's it seems to know? Oh yes,.

B

So we have got plug-in vsi plugin, so we each release. We are anything we buy. Now we set back in a less the idea plugins. So anyone if juniper can just install it in the IDE people, do the code completion and all the such difference between the ID, safe wow.

A

That's awesome, obviously now the next question would be gusted also exists for VI or.

B

Plugin me in the photo syntax highlight highlight it, but I'm not sure this painting.

B

A

B

Okay, okay, so uh so I just imported the Magna HTTP library. So here now so he sees the first class say this so that when I just type, you were working the service, if you auto completion for the for full service notation. So here you can see, serves come with the service and you can have you and we can do a name, so I will make it know, which other a name to the hello so I'm going to the color world trust you.

A

B

A

Foreign to you, it's controlled by I, see a HTTP service. Could I also replace that with shear PC.

B

Yes, we support the FPC, makes different protocols. Services, yeah I will show you. We have a tons of help of materials, tutorials examples with different ability for a functionality, tonic, freaky, okay, so sir enzymes can have multiple resource.

B

Yes, so here is it's come as a single resource in the same plate, so I will change it to the resource called hi. Now, within the resource you can see, there are two parameters, one is the in point called call that is who can call the service and next one is? It can also pass the requests that come under the this resource, so as a HelloWorld is for the initial I will set the response and send it back to the caller. That's my de hello ball.

B

So I can I can use 30, TP response and K rest and I can set the pail or, like I, say hello.

A

Just to see if I got that right, if I would want to write an echo service, I could actually take, and you know it says, like you know, I would say hello and thing would be it would echo whatever I put in there. So I could use the request, object or resource or whatever and put that back into your response. Yes,.

B

Yeah, so so I will say: I will show you that how we can deal with the request, so here I guess without getting in a request here. I just set the response fast and then I will come to the request, handle request, parameter.

B

So then, so I have higher set. The response. I can just call the : point, and here you can see. I am using arrow notation.

B

So try user rests here. I will explain. Why is what is this? I? Don't Asia so here so very now, syntactically you, the developers I, am going to do in our remote core. So it is a local call. It is a dot notation that in memory.

B

Different differentiate between the local coal and the network code.

A

Okay, so local would be in the context of the server, so restaurants and payload would be in the context of wherever the arena server service. Whatever is running, the caller would be on the colleague.

B

And also here so bear in now, so the one one fundamental, the this design principle is that to minimize the mr. developers mistake winner with the so here you can see so this Kolar method of the function. It return a response, so we have ahead of that respond. Oh right cups like oh, we can just redo it by passing it on the scope, but so here the motivation Berry is that so you've got a response. Coming back for a particular function by developer, you should be expected to handle it or wait.

B

We can take oh boy, okay, so now so we have like set the response and send it back to the caller. Now we were writing a service. Now to call this service, we need to bind a particular for so barely not so yeah for the first sample I will bind. This serves into a particular port using inline, binding I can just find entirely for the first service to the port, say: nine: zero, nine, zero, colonel, okay, I think we are fine now, so we can we can.

B

We can either build the Baron ah and run it or we can just run the Biot I know by now run come on like go run. Yes, we can ballerina run again, you the those fine if I run it so it will compiled and write and then, let's see, do I will use the coil come on.

B

I am going to curl this service by using toy. So here.

B

So by default, so high I have set my service name, call hello and my source name called hi. I have not set the path explicitly use hello.

B

A

That is a very sensible. Yes,.

B

So now I guess.

A

What happens behind the scenes? So? Okay I have a ballerina but like how does that relate to communities? Where does who it is flea? Internet and oh, yes,.

B

Yeah, so this is the first hello world, so this there's no communities. You know all this fun. I will come to that in a few minutes. Give me five minutes. I'll come to that before I come to that I will I want to like I explained another few things in the ballerina does by default, so so now so so like who earlier the questioning allocation, is how we can't like older I can get the request and do some ordination and send it back hello, one.

B

Let's try to do that first and then we'll come to the communities.

B

Okay, so now so marina, so we can change our service configuration. Even the resource can fit by using annotation. So burner comes with default, HTTP annotation, so he here I'm going to use service using HTTP source fanfic annotation. So you can see there are a bunch of functional you can use within this annotation I will change the base power to slash. Oh I can just call my service loses, wrote, yeah, sash is, and also I want to change my resource.

B

So I want to change my resource by say, says: config annotation ah so now say if I want to there's multiple options, so I want, like I, want to change the path to this one. Also road and I just call the four nine zero nine zero it can access. Now, how can you want to set the method to the post?

B

A

So you would then do a curl post on yes, localhost 1990 slash and you would yeah.

B

Now, rather like just sending the response back, yes, you some just get the resource and request and setup response back, so I was defined. The string call, maybe bill Lord, say quest Chris not get hello testing. Nice.

A

So I don't even need to to screw around with any kind of post thing it parses yeah.

A

B

Me it is need to understand all the HTTP things, and also you can see, there's a red underline so because of this thickness can be either return string of error. This you did that.

B

So we they do not have handle the error or for the dissing. Are you I just passed by you think, a keyboard. It will pass to the next level of this error. Yeah.

A

It's a bit like an NGO where you get the last row.

B

Matter would be the error and.

A

Then you would say if.

B

We develop the burner, we look at all the programming language out there and we put all the good things from all the program line. They just make it super easy to do the purse to use the mistake that they are doing. So that's what one of the motivation behind the register I.

A

Like the fact that you're referring to Arrowhead lingo is one of the good features I like that.

B

Yeah, okay, so uh so I just set the pale or pale or the screen from the request. I can say hello say: set the payload here.

B

Okay now even know it. You know underlined.

A

B

Great underlined so because better enough come by ticketed by default, so here we are going to pass some sensitive payload into the forest respond so now either user how to be expressive, t pass it a car and you can taint it and pass it or week and I can do some checking and deposit. So again, the motivation is produced developers. Mistakes here.

A

So essentially strongly tied and you you're you're playing it safe here, but you can essentially say you.

B

Know what I don't really care like.

A

You know I I, just take it as it is yeah.

B

Okay, I will do another small change to here. Rod I'm using the inline hot binding I, can define the endpoint, so Baron endpoint is the first class like I conclude I will throw in why VI we are going to use a separate point object here. So I just create HTTP, listen endpoint, and this is nine zero. Nine, zero and I can, just by knee to the my listener here good. How define second point and my I find myself?

B

Okay now, if I do the same, when I run.

B

Compile and run now, rather, okay. Yes, if you look at the, if you loose a current curve, you should not work because.

B

There's no making me sore spot for now. We change the power again, it's your first because of method. Okay, now, let's make it post code and we passed some payload.

B

Okay, so this is how you can write the course of course. Now let us look at how you can deploy it into the door and Copernicus crater.

B

Okay, so don't do that so so, before going to just do that, so I will just show you another sheep hunting, so Barina comes with the it can generate directly interpret in interpretation of you pro.

B

So in this case it says the caller and the service request coming. We are doing changes here and same inspector. So if you weigh no writing or call from all the complex program and we, this image will be changed its tiny bit changing.

B

A

B

The the motivation behind to provide this sequence diagram is so it's a SS, so we have work thousand of integration problems plus last 13 years. So whenever we go to the customer location, when you I want to explain some, we are doing the whiteboard so and also when you, when you write some code even that you come commerce, computer company, they can't understand it is they can. But this is hard to understand the pipe go into the code text code. But now, if you can't generate this sequence diagram, which is easier example, all you that's.

A

Super useful yeah, yeah.

B

Ok, let's go to the kubernetes samples so now so I want to deploy this into the favelas. You know what, yes, you can do deployment so so we're in accounts with ballerina expository at the extension you can docker and communities. So we can have the dope I'm, not using good choice. I guess import yeah yeah!

B

So now so so, if you look at, if you, if you anyway, you know the communities now when you want to do flow this in communities. First, we have to generate the binary. Then we have to local file. To create images may be deployment.

B

All are doing all of these things. I just I can just use the annotation care Nagi's deep penetration right, I guess at the name.

B

A

And can I ask you there sorry sorry to interrupt you all over again, but I think it's important. These questions we didn't forget anything. This is now kind of hard-coded in my demo file. But if I want to parrot rice, I say you know, I, don't want a hard code name space, for example. Name is okay, but I, don't wanna, you know yeah, it's prescribed in which namespace they should be deployed. I want to do that. You provided at runtime.

A

B

Well, sabrina has country config ApS, so you can read values from the variable or in config files. So if you make it namespace readable from the like country kpi's, you can make a pass in interval system. All these namespace or the cryptic account all these things. Then you can, for example, so at the moment they support all this functionality, so any of any of them you can power as far as the Penta KBS, then it you read from the environment variables. Then we can do the cs-80 based system to build the finale's.

B

Okay, so now I just put the name I say hello, world. That's enough for my illustration: I'm not doing any lioness bobbing other things maybe I can put now. So this will create the communities if Roman Yama has been a sadhaka images since I have not chatted. Okay, which name for I, can say that they, the famous name here, image, name image. Name, oh, if I'd not set the image name it you hit the my hello, sir, so his name as it okay, image name and.

A

How does pole arena figure out where to put the resulting image? How do you.

B

Before you say to look for the local doctor Timur, but even you can set it to house different docker.

B

Host machine it will connect to the vector co-host and will the docker images. Okay,.

A

If I want to like it say, for example, I want to like I have my container, which is typically or usually always on Quayle right. So how can I tell when arena hey? You know if you produce an image here, she's put it into Mike way. Oh.

B

Yeah so so, if you look at.

B

The co-host and the set path I could connect to that.

B

A

Docker host is essentially the concept of the container registry. Yes,.

B

Okay, now I want to access this using a copious services, so so do that I. So here the Parana input will do the listening path. That means is I can use the annotated by nine phone using covetous service, or in this case so I can give the name not mandatory, but I'll give the name hello.

B

And now so, since I want to access this, using our note, 4 I can set the service type reach node 4, nice.

A

Now I've seen the increases well, there yeah.

B

Yeah you can across by having excessive yeah, okay I, think I done it decoding, so it's like, but and if my two lines of code for my program now. So if you look at here so any kubernetes artifact under under by.

A

That's the part where the magician says look, my head is empty right.

B

Here, I'm going to expand a bill comma rather not come on so bill and I came to the source file. Now, if I do do that, it will generate all the committee's services.

B

B

You can see because you needed my files.

B

Ok, let's try to deploy using take has also printed the line.

A

B

Okay, now it's already deployed what you can see hello world for this Ronnie and if I go to the coop seat here it service, you can see Hello versus running using a not post type, so here's the out phone so I can just use this note, for you can use the same come on what are the changing the whole.

B

A

Wow, this is amazing, echo I'm really sweating. That's that's. Really amazing. I, like it.

B

So, like I said so we don't want to the destructor. Even a purse flow here right.

A

B

Tools same ID, they can you throw it in subcommittees ticket st, so it's like a very powerful competitive or the first experience right.

A

Right, this is amazing, so let me think about that, like you know, I'm a quickest developer, some developing apps on and I want to get into like I I subscribe to that, but I really want to start using ballerina. What like you know, this is a great start. I totally get it unless you've seen that most of the stuff was kind of, like so obvious to me that I could immediately guess from purely from looking over your shoulder to what what's going on. But what would be the expected outcome?

A

Take me beyond that for some real-world deployment real-world application. What would be the next step? What do you advise our viewers out there beyond that? The what you've just seen you I'm gonna, install Valerie, now I'm gonna. Do that? What's next, what what should I have a look at you know any other. Next steps. Do you have stuff up stuff up on Kalakuta or maybe or any resources? What are the next steps beyond this hello world? Yes,.

B

Yeah so so I mean so been hosted by a dot IO so which scans the terms of materials of learning materials, so so philosophy page explained all the philosophy behind why we create new programming language like what problem we are going to solve.

B

What are the language design principles we deal with and then how minor works? We had a sense and what are features so how the workers handling concurrency stream transactions. All these handling I know so like so go to the learning material. There's two main learning materials. One is a pen up by examples like it has. The I would say. 100 of examples like IOD remains: secret eats so controls, error, handling testing objects which TP libraries yep so code. Here we see the MS resiliency, all things are come under the knife, samples and one more thing.

B

So if you look at the, if you look at the full guide line guide to develop very 9 production grade, so I guess we call burna by grind. So, if there's a bunch of guys, so you can cut one of this night. It it it come under is the crane so how the develop we can do the testing and how you can like do the deployment Ola in the one guide, explaining it. What end-to-end testing in the deployment or less Wow.

A

So we are almost on top of the hour or the timeframe, but I do have another two or three questions. If you still have a few minutes.

B

A

Learn like I get totally what this is about, how it works. You know, roughly now in any kind of real world setup. What I would expect as well is some kind of you know. Let's call it absorb ility story, so you know maybe per meter disintegration like what is your like? How is Valerius approach to this kind of ability? How do I get inside? You know how how the calls have succeeded or not or metrics,.

B

Yeah so buddy now come as the observatory as a default, for example, so Prometheus indication is out of toast. So by now, runtime has support open tracing specification, so it by default it can I call the stat matrix and there send to the Prometheus to pull all this that from the runtime so absorb it. You also build en dessous the Baron all right. So if you know cancer, so if you cut the absorb ility, so it has all the indicate enemies, the all the Prometheus Jager, all the things I indicated type.

A

Wow, that is, super impressive I was hoping for, but I.

B

And one more thing so by now come with packet in the bill package management like there's a concept called banner central, look at say intra, so any community can develop their own like packages of connectors. They can upload into the center.

B

Like a local house,.

A

So I did notice a human in Copenhagen earlier this year you had a stand there. All the Reno's was very prominent and- and you know, super busy, there were people all the time. I was honestly. I was so busy. I didn't even bother to queue and wait. There I thought you know I find other ways to reach other yeah.

A

Where is it heading how's, the community doing? How is it like from a governance setup so like I? Take it it's open source like if I want to contribute a fee? You know my favorite. Let's take them to the I, accept right. My favorite editor is not yet fully supported or yeah.

B

A

Want to contribute how's the whole open source, Commons things yeah, so.

B

Very nice like fully open source project, so we launched Purina I, said: go to market event in the Copenhagen cook phone, so we have yeah spend three years. We had the sense to develop language.

B

Now, oh I think we have more than 200 plus developers so from W. So do we have 40 developers full-time developers working by now, but we have now 200 and 200 first developers, so it is fully open source and opportunist hands and like we are. We are working with different ecosystem partners like yeah, looking with this geo voice to education well as functional partners. So, basically- and also we want to move into the flight since yep.

B

We can then go into the Reliant with the cojones yeah.

A

That was my next question terms of where is it heading in terms of CN CF as well? You might not know, but I'm sincere as ambassador, and you know, is trying to see what the next projects might be and, okay, that's that's really great to know awesome any any last words anything you want to share with. Yes,.

B

Yeah, so basically so I very well when you come so if you can time to contribute the vi planning so I, quite so, he born to fully engage with the community. So all things I own, open, open model like all the podium will be table. All the issue see Nikita P chose. We have open well in list all the technical, technical discussions, all the discussion on Barry and I self discussing within the community.

B

So we welcome all community developers to join with our effort like make it more powerful developer for the next generation, so make it empower developer game.

A

Hey like well, thank you so much. This was really yeah.

A

As I said, more than, and I was hoping for was very yeah, exciting and- and you know, cool for me to see all these different aspects of how you can develop locally, you can develop and deploy against an existing communities clasper with just a few, essentially just two or three lines: annotation saying like hey deployed it to communities and I, think we have now established a basis for people to you know they understand now it deciding what this is about and just take it from there and see that people give it a try and and start contributing using.

B

Thank you Michael for the opportunity to talk with you new el khazzani ballerina.

A

Okay thanks a lot.