The presentation will address the following topics:
Most examples will focus around GLM 5.3 and Perl.
Maximilian Maischein aka Corion.
Max is a long-time Perl programmer and contributor. He is co-organizer of the German Perl Workshop and writes Perl code as a long-time hobby. At his dayjob, he combines bank deposits with DLT to create deposit tokens as digital money.
60 minutes
]]>The Model Context Protocol (MCP) has rapidly become the standard way for AI assistants to interact with external applications. But how do you add MCP support to an application that already exists?
In this practical workshop we'll take a real Dancer2 application and add an MCP server that exposes its existing functionality to AI clients. Along the way we'll look at the MCP protocol, JSON-RPC, tool discovery, schema design and request handling, while keeping the implementation cleanly separated from the application's existing business logic.
We'll see how a YAML-driven design allows a single source of truth for tool definitions and documentation, and why adding MCP often turns out to be far less work than you'd expect when your application's architecture is already sound.
By the end of the session you'll understand the MCP protocol, know how to implement an MCP server in Perl, and have a design you can adapt to your own applications.
Dave Cross has been writing Perl professionally for more than thirty years. He is the author of several Perl books, including Data Munging with Perl (Manning) and Perl Template Toolkit (O'Reilly), and has been speaking at Perl conferences around the world since the late 1990s.
He builds web applications with Dancer2, contributes to open source, and has recently been exploring how established Perl applications can integrate with modern AI technologies such as the Model Context Protocol (MCP). His Line of Succession website now exposes its data through an MCP server, allowing AI assistants to query Britain's royal succession directly from the site's underlying database.
Dave believes the best way to learn a new technology is to build something real with it, and this workshop is based on exactly that experience.
1 hour
Slides and other stuff available on the talks site of Dave Cross:
Model Context Protocol in Perl: From Web App to AI Tools
00:00:03.000 --> 00:00:15.000 Excellent. So welcome to the Code Maven channel. If you are watching on the YouTube, if you are here, thank you. Really. I'm so many people joined us.
00:00:15.000 --> 00:00:31.000 You are lucky because you can ask questions and we had a chat earlier, and you're going to have a chat after the presentation. But for now, let's welcome Dave Cross. Thank you very much for agreeing to give this presentation, although probably everyone in the Perl community knows you.
00:00:31.000 --> 00:00:35.000 We start with some introduction and then go ahead, the stage is yours.
00:00:35.000 --> 00:00:40.000 Okay, well, thanks for asking me to do this presentation.
00:00:40.000 --> 00:00:50.000 Yeah, so as Debor said, I'm Dave Cross. I've been using Perl for, I think it's probably 30 years now.
00:00:50.000 --> 00:00:52.000 Um, I…
00:00:52.000 --> 00:01:01.000 I worked for a huge number of different companies because I was a freelancer for the longest time.
00:01:01.000 --> 00:01:08.000 working for banks and startups and places like the BBC and The Guardian.
00:01:08.000 --> 00:01:13.000 But if you've been to a Pearl conference, particularly in Europe,
00:01:13.000 --> 00:01:17.000 Over the last 25 years or so, there's a good chance you've.
00:01:17.000 --> 00:01:22.000 seen me give a talk. I've written a few books.
00:01:22.000 --> 00:01:32.000 Um, most well known is probably data munging with Perl, and I should probably mention that there's a second edition of that.
00:01:32.000 --> 00:01:34.000 about.
00:01:34.000 --> 00:01:38.000 the next month, probably in a month's time.
00:01:38.000 --> 00:01:45.000 But yes, so today we are going to talk about.
00:01:45.000 --> 00:01:50.000 The model context, protocol, specifically putting it.
00:01:50.000 --> 00:02:00.000 on the front of an existing Perl application and the application that I chose to do it with was my.
00:02:00.000 --> 00:02:02.000 British royal…
00:02:02.000 --> 00:02:05.000 family line of succession website.
00:02:05.000 --> 00:02:14.000 But by the way, Dave, I think we are seeing the snipping tool on your screen. I'm not sure if that was the intention.
00:02:14.000 --> 00:02:16.000 Or it's my screen, I'm not worried. No, it's not.
00:02:16.000 --> 00:02:19.000 Uh, oh, hang on.
00:02:19.000 --> 00:02:20.000 Maybe.
00:02:20.000 --> 00:02:26.000 Maybe we are seeing a different screen that you wanted to share.
00:02:26.000 --> 00:02:30.000 Okay, let me see if I can.
00:02:30.000 --> 00:02:46.000 Work out how to stop sharing.
00:02:46.000 --> 00:02:50.000 There should be some way for me to.
00:02:50.000 --> 00:02:55.000 Stop sharing the screen.
00:02:55.000 --> 00:03:04.000 Oh.
00:03:04.000 --> 00:03:11.000 Is that better?
00:03:11.000 --> 00:03:19.000 Can you see the Zoom screen now?
00:03:19.000 --> 00:03:21.000 I'm getting loads of thumbs up.
00:03:21.000 --> 00:03:22.000 So, okay.
00:03:22.000 --> 00:03:26.000 Okay.
00:03:26.000 --> 00:03:27.000 Let's go back to this then.
00:03:27.000 --> 00:03:30.000 I was giving you feedback, but while I was on mute. So yeah.
00:03:30.000 --> 00:03:41.000 So we're all at, yeah, I can see green lines around that screen now, so that sounds like we're in the right place. Okay, so as I was saying, I have this web app.
00:03:41.000 --> 00:03:45.000 Um, which, um, deals with the, uh,
00:03:45.000 --> 00:03:57.000 British royal family, the line of succession to the throne, which enables you to answer questions like this, who was the sovereign?
00:03:57.000 --> 00:04:06.000 On the states, who are the first five people in line to the throne, for example.
00:04:06.000 --> 00:04:08.000 Um…
00:04:08.000 --> 00:04:21.000 So what we're going to talk about is I'm going to give you a brief introduction to the existing application. We're going to talk a bit about what MCP is and how that works. We will then
00:04:21.000 --> 00:04:28.000 have a bit of a look at the code and trace how one request goes through the code.
00:04:28.000 --> 00:04:41.000 And then we will look at what I learned whilst I was doing this, and what I might want to do next. And hopefully, we will have plenty of time at the end for you to ask.
00:04:41.000 --> 00:04:44.000 Any questions?
00:04:44.000 --> 00:04:47.000 Okay, so…
00:04:47.000 --> 00:04:58.000 Like so many websites, certainly like most of the websites that I've ever worked on, the line of succession is basically a database with.
00:04:58.000 --> 00:05:11.000 pretty front-end on it. And what it does is it gives you current and historical information about the British line of succession. Let me just
00:05:11.000 --> 00:05:13.000 see if I can…
00:05:13.000 --> 00:05:16.000 Bring it up so that you can.
00:05:16.000 --> 00:05:21.000 see it.
00:05:21.000 --> 00:05:27.000 So this is the home page of the website.
00:05:27.000 --> 00:05:33.000 And it's got a list of the people who are in the British line of succession. It does the top, it does the first 30.
00:05:33.000 --> 00:05:50.000 Um, and that's not very interesting because there are dozens of websites out there that do that. But the interesting thing here is if you notice every date that you see is a link. And if we click on one of these links.
00:05:50.000 --> 00:05:58.000 It goes back in time and shows you who was on the line of succession at that date.
00:05:58.000 --> 00:06:02.000 Now, I wrote it because…
00:06:02.000 --> 00:06:12.000 I found it an interesting problem to work on, to solve, but people do seem to find it interesting. It's of all the websites that I run.
00:06:12.000 --> 00:06:24.000 This has the most usage of any of my website. It has thousands of hits every month.
00:06:24.000 --> 00:06:36.000 Right. So, it's a dancer website, there's a SQLite database, because the data's actually pretty small.
00:06:36.000 --> 00:06:45.000 a number of you, when we were going through the introductions earlier, a number of you, um, indicated that you… that you knew what dancer was.
00:06:45.000 --> 00:06:50.000 But it's a web framework.
00:06:50.000 --> 00:06:56.000 It basically, it matches roots and a root is a…
00:06:56.000 --> 00:07:01.000 HTTP verb, so get, put.
00:07:01.000 --> 00:07:03.000 Delete.
00:07:03.000 --> 00:07:04.000 query.
00:07:04.000 --> 00:07:08.000 against a path, so the roots or
00:07:08.000 --> 00:07:10.000 some path.
00:07:10.000 --> 00:07:17.000 run some code, and at the end of that code, it produces some HTML.
00:07:17.000 --> 00:07:22.000 And then the important thing to bear in mind here is that
00:07:22.000 --> 00:07:25.000 like most
00:07:25.000 --> 00:07:33.000 applications that I write, web applications that I write, I'm very always careful to include a model layer.
00:07:33.000 --> 00:07:43.000 In the system. So that means I'm not putting raw DBIS class or DBI.
00:07:43.000 --> 00:07:44.000 Road.
00:07:44.000 --> 00:07:49.000 In the request handling code.
00:07:49.000 --> 00:07:50.000 Um…
00:07:50.000 --> 00:07:57.000 I'm putting it in a separate layer. Let's just…
00:07:57.000 --> 00:07:59.000 uh, show you a bit more of the code.
00:07:59.000 --> 00:08:01.000 Um…
00:08:01.000 --> 00:08:05.000 So for example,
00:08:05.000 --> 00:08:11.000 So here I think I'll have to ask you if you could enlarge a little bit the font.
00:08:11.000 --> 00:08:12.000 Probably.
00:08:12.000 --> 00:08:16.000 Do we won't see?
00:08:16.000 --> 00:08:17.000 Is that enough?
00:08:17.000 --> 00:08:18.000 Yeah, thanks. Thanks. Wow.
00:08:18.000 --> 00:08:25.000 That's, yeah.
00:08:25.000 --> 00:08:27.000 Um, right.
00:08:27.000 --> 00:08:29.000 So, let's
00:08:29.000 --> 00:08:31.000 All right.
00:08:31.000 --> 00:08:37.000 This rather complicated looking bit, uh, is the bit that does the main, the main page.
00:08:37.000 --> 00:08:41.000 Um, and so if you get a GET request,
00:08:41.000 --> 00:08:45.000 to something… this matches a date.
00:08:45.000 --> 00:08:50.000 or nothing, because that's all optional.
00:08:50.000 --> 00:08:54.000 Uh, then basically what it does.
00:08:54.000 --> 00:08:58.000 Is that we create an app,
00:08:58.000 --> 00:08:59.000 I.
00:08:59.000 --> 00:09:02.000 And the app is the thing that…
00:09:02.000 --> 00:09:04.000 goes on top of the model.
00:09:04.000 --> 00:09:11.000 allows you to get the useful information from the database. So there's actually very little code.
00:09:11.000 --> 00:09:14.000 in this, it just calls template.
00:09:14.000 --> 00:09:22.000 And if we…
00:09:22.000 --> 00:09:23.000 Find…
00:09:23.000 --> 00:09:26.000 the…
00:09:26.000 --> 00:09:29.000 index template.
00:09:29.000 --> 00:09:34.000 For example,
00:09:34.000 --> 00:09:35.000 Uh, yes, same.
00:09:35.000 --> 00:09:43.000 Here we are, we've asked the app for the rows that are in the succession.
00:09:43.000 --> 00:09:47.000 for the… for the current date that we're displaying.
00:09:47.000 --> 00:09:50.000 And so there's no database code.
00:09:50.000 --> 00:10:00.000 in either the request handler or the template. It's all in this model.
00:10:00.000 --> 00:10:02.000 Layer.
00:10:02.000 --> 00:10:05.000 And that turned out to be a real
00:10:05.000 --> 00:10:08.000 really useful idea.
00:10:08.000 --> 00:10:12.000 Um, so, because in the existing model,
00:10:12.000 --> 00:10:17.000 We have these, well, we have a number of methods, but in particular,
00:10:17.000 --> 00:10:28.000 We have these methods called sovereign on date, which you pass a date and it gives you back the name of the, well, the details of the person who was the sovereign on that date.
00:10:28.000 --> 00:10:40.000 And we have another method called getSuccessionData. Again, you pass it a date and you pass it a limit, which is the number of people that you're interested in seeing, and it returns you.
00:10:40.000 --> 00:10:51.000 data for all of the people who were in the line of succession in order on that date.
00:10:51.000 --> 00:10:56.000 And this turns out to be quite a powerful idea.
00:10:56.000 --> 00:11:04.000 Because it allows you to have different views on the same data.
00:11:04.000 --> 00:11:12.000 So we saw the web page and the web page serves hugely.
00:11:12.000 --> 00:11:17.000 humans that turn up and open their browser and look at the website?
00:11:17.000 --> 00:11:27.000 But we have a JSON API, actually it's turned off I think, at the moment because it's not particularly useful. But that's there for…
00:11:27.000 --> 00:11:30.000 Machines for software programs.
00:11:30.000 --> 00:11:48.000 programs, they can do similar queries to what humans do when they go to the website, but instead of getting back a web page with the navigation and the sidebars and all that kind of thing, the machines, when they call the API,
00:11:48.000 --> 00:11:56.000 get just the pure data back in a format that they understand stops them having to scrape the page.
00:11:56.000 --> 00:12:03.000 And then we have this new method. And bear in mind, the
00:12:03.000 --> 00:12:11.000 The Line of Succession website has been around for approaching 10 years now.
00:12:11.000 --> 00:12:21.000 So nobody knew about MCP when I first wrote the, this website.
00:12:21.000 --> 00:12:37.000 This shows the flexibility that because I have this model layer, I'm able to deal with something brand new that nobody had heard of a couple of years ago and just write an MCP layer.
00:12:37.000 --> 00:12:42.000 On top of it, which, so, I now have
00:12:42.000 --> 00:12:47.000 web service that can serve readers.
00:12:47.000 --> 00:12:55.000 serve pieces of software through the API, but can also serve AI clients.
00:12:55.000 --> 00:13:03.000 And when I say AI clients, we will see a bit later on the kind of things that can
00:13:03.000 --> 00:13:06.000 talk to it, but you can write
00:13:06.000 --> 00:13:08.000 uh, software.
00:13:08.000 --> 00:13:16.000 that uses, for example, the OpenAI API and ask that to include.
00:13:16.000 --> 00:13:19.000 by MCP tool.
00:13:19.000 --> 00:13:31.000 But you can also just include my MCP tool in your Claude or your OpenAI chat bot.
00:13:31.000 --> 00:13:38.000 And we'll see how all that works a bit later on.
00:13:38.000 --> 00:13:44.000 Okay, so put yourself in the mind of the…
00:13:44.000 --> 00:13:47.000 assistant, the LLM.
00:13:47.000 --> 00:13:52.000 the AI tool that wants to get to this information.
00:13:52.000 --> 00:13:58.000 It needs to know a number of things. It needs to know which operations are available.
00:13:58.000 --> 00:14:06.000 It needs to know, what does each operation do? Why would it use each operation?
00:14:06.000 --> 00:14:12.000 Um, which arguments does it need to pass in order to get useful information back?
00:14:12.000 --> 00:14:17.000 Um, and what's the format of the data?
00:14:17.000 --> 00:14:21.000 But it gets back.
00:14:21.000 --> 00:14:29.000 Um, so we need to set up definitions for the answer all of those four questions.
00:14:29.000 --> 00:14:33.000 And that is what…
00:14:33.000 --> 00:14:40.000 model context, protocol gives us. Now this was, I guess it's probably been around for
00:14:40.000 --> 00:14:48.000 two, maybe three years now. It came from Anthropic, the people behind Claude.
00:14:48.000 --> 00:14:56.000 Uh, and it's a protocol for connecting AI applications with any kind of external.
00:14:56.000 --> 00:15:03.000 capability, an external server. If you, um…
00:15:03.000 --> 00:15:12.000 If you access… if you use Claude or OpenAI or ChatGPT to
00:15:12.000 --> 00:15:25.000 interface with GitHub, for example. If you ask your ChatGPT agent to give you a list of the open issues on a GitHub.
00:15:25.000 --> 00:15:35.000 repo. It's using an MCP that GitHub have made available. If you
00:15:35.000 --> 00:15:37.000 Um, all.
00:15:37.000 --> 00:15:43.000 Claude to check your calendar and see if you've got room to add in.
00:15:43.000 --> 00:15:48.000 an appointment on a certain date.
00:15:48.000 --> 00:15:54.000 It can do that because Google have made available an MCP that allows.
00:15:54.000 --> 00:16:00.000 AI to talk to your Google Calendar. In fact, anything in your Google.
00:16:00.000 --> 00:16:04.000 workspace.
00:16:04.000 --> 00:16:09.000 So these are the four things that you need to.
00:16:09.000 --> 00:16:16.000 Implement if you're writing an MCP.
00:16:16.000 --> 00:16:19.000 You need to respond to an initialized call.
00:16:19.000 --> 00:16:34.000 So which is basically just the client talking to the server and saying, here I am, I'm going to be asking you some questions. You can do quite clever stuff in there, but to be honest, my use case
00:16:34.000 --> 00:16:41.000 I barely need that at all. I only need it because, um…
00:16:41.000 --> 00:16:45.000 the AI tools expect it to exist.
00:16:45.000 --> 00:16:52.000 There's notification initialized, which, to be honest, I haven't had to use at all in my.
00:16:52.000 --> 00:16:55.000 tool.
00:16:55.000 --> 00:16:57.000 And then there's tools list.
00:16:57.000 --> 00:16:59.000 Which…
00:16:59.000 --> 00:17:06.000 Gives you a list of tools, as you might expect. You make a request to it and you just get back.
00:17:06.000 --> 00:17:09.000 A data structure, JSON.
00:17:09.000 --> 00:17:17.000 which lists all the tools that are available in from that MCP.
00:17:17.000 --> 00:17:27.000 And then finally, you have Talk's call, which actually makes a call to one of your tools and
00:17:27.000 --> 00:17:34.000 sends back the data which the AI will then.
00:17:34.000 --> 00:17:41.000 Use.
00:17:41.000 --> 00:17:57.000 Uh, so we're going to write, I have written two domain tools for my application and purely coincidentally, they happen to map onto the tool, the two model methods that we
00:17:57.000 --> 00:18:01.000 talked about earlier, we're going to have
00:18:01.000 --> 00:18:17.000 sovereign on date, which gives us the name of the sovereign on a particular date and line of succession, which you can pass it in a date and you'll get back a list of information about the people who were on the line of succession.
00:18:17.000 --> 00:18:21.000 On that date.
00:18:21.000 --> 00:18:26.000 So the first thing you need to do is to define
00:18:26.000 --> 00:18:31.000 The way that these, um, tools are going to be called.
00:18:31.000 --> 00:18:43.000 Now there's a cut down version of it here, but if I bring up my
00:18:43.000 --> 00:18:50.000 VS Code, then in the public directory.
00:18:50.000 --> 00:18:53.000 Here's the entire…
00:18:53.000 --> 00:18:57.000 file and you can see it's got a description.
00:18:57.000 --> 00:19:06.000 It's got some hints which we don't need to worry about. We've got the actual documentation and then importantly, we have the input schema.
00:19:06.000 --> 00:19:14.000 which says, so this is sovereign on date we're looking at. You need to pass it an object, a JSON object.
00:19:14.000 --> 00:19:21.000 The properties that you can set, you can give it are a date.
00:19:21.000 --> 00:19:28.000 And it's expecting the day in ISO standard format, and it's also saying that date is required.
00:19:28.000 --> 00:19:34.000 Whereas the other tool, Line of Succession,
00:19:34.000 --> 00:19:38.000 Um, .
00:19:38.000 --> 00:19:49.000 It's got a date and it's also got a limit, but none of them are required. Neither of those are required. If you don't pass the date, it works on today.
00:19:49.000 --> 00:19:54.000 And if you don't pass the limit, it defaults to 10.
00:19:54.000 --> 00:19:56.000 And that's defined.
00:19:56.000 --> 00:20:05.000 that file.
00:20:05.000 --> 00:20:12.000 And interestingly, I was quite pleased when I worked out I could do this.
00:20:12.000 --> 00:20:15.000 I can use that file,
00:20:15.000 --> 00:20:19.000 In two ways, I can…
00:20:19.000 --> 00:20:24.000 Um, pass it to the.
00:20:24.000 --> 00:20:31.000 When a method, when a client calls tools list,
00:20:31.000 --> 00:20:36.000 I can extract useful information out of that file to
00:20:36.000 --> 00:20:39.000 return it to the…
00:20:39.000 --> 00:20:47.000 user, or to the client, but also I've got a documentation page on the
00:20:47.000 --> 00:20:54.000 On the website, and I can extract information from that.
00:20:54.000 --> 00:20:57.000 Uh…
00:20:57.000 --> 00:20:59.000 From that document to determine.
00:20:59.000 --> 00:21:05.000 displayed on the web page. If I go back to the website,
00:21:05.000 --> 00:21:15.000 I'm right at the bottom here, we have a link to MCP.
00:21:15.000 --> 00:21:18.000 And here we have documentation of the…
00:21:18.000 --> 00:21:21.000 of available tools.
00:21:21.000 --> 00:21:23.000 And there's the input schema.
00:21:23.000 --> 00:21:25.000 here.
00:21:25.000 --> 00:21:31.000 And if we look at the…
00:21:31.000 --> 00:21:34.000 Template for the MCP page.
00:21:34.000 --> 00:21:38.000 get to the available tools section.
00:21:38.000 --> 00:21:42.000 You can see it's just been passed in that YAML.
00:21:42.000 --> 00:21:54.000 the decoded version of that YAML and it just iterates across that. So as soon as if I go to add a new tool, as soon as I document it.
00:21:54.000 --> 00:21:56.000 And
00:21:56.000 --> 00:22:01.000 in the YAML file, it will automatically.
00:22:01.000 --> 00:22:02.000 appear.
00:22:02.000 --> 00:22:07.000 the documentation page, as well as.
00:22:07.000 --> 00:22:13.000 automatically appearing in response to the tools list.
00:22:13.000 --> 00:22:20.000 Call. The only thing I actually have to do is obviously implement that.
00:22:20.000 --> 00:22:30.000 new tool in whatever way seems appropriate to me.
00:22:30.000 --> 00:22:31.000 Um.
00:22:31.000 --> 00:22:37.000 So the MCP object, which we'll look at in a bit more detail soon.
00:22:37.000 --> 00:22:38.000 Um,
00:22:38.000 --> 00:22:44.000 Has two methods. Tools returns the actual.
00:22:44.000 --> 00:22:46.000 Object.
00:22:46.000 --> 00:22:50.000 for returning to the tools list.
00:22:50.000 --> 00:22:54.000 Um, cool, but tall docs.
00:22:54.000 --> 00:23:02.000 returns it in a slightly different format, which can be used on the web page.
00:23:02.000 --> 00:23:09.000 Um, but reusing things is…
00:23:09.000 --> 00:23:13.000 an idea that we've managed to use again.
00:23:13.000 --> 00:23:14.000 But in…
00:23:14.000 --> 00:23:18.000 our dancer code.
00:23:18.000 --> 00:23:27.000 So this is in the main…
00:23:27.000 --> 00:23:30.000 Library, which defines all of the.
00:23:30.000 --> 00:23:33.000 Um, .
00:23:33.000 --> 00:23:37.000 defines all of the roots.
00:23:37.000 --> 00:23:46.000 And obviously, so the page that I just showed you, the MCP documentation page, sits at…
00:23:46.000 --> 00:23:49.000 MCP.
00:23:49.000 --> 00:23:53.000 So when you do a GET on MCP, you
00:23:53.000 --> 00:23:56.000 want to be returned.
00:23:56.000 --> 00:23:58.000 that page.
00:23:58.000 --> 00:24:12.000 However, in some implementations of MCP, the MCP client will do a GET on MCP in order to work out whether.
00:24:12.000 --> 00:24:16.000 an event stream is defined.
00:24:16.000 --> 00:24:26.000 On that URL, on that path, um, and they do that by adding an accept header of text event string. Now,
00:24:26.000 --> 00:24:31.000 I don't know how event streams work.
00:24:31.000 --> 00:24:41.000 But I just know that you have to tell them that they don't… it doesn't exist if it doesn't exist. So I return a HTTP 405.
00:24:41.000 --> 00:24:46.000 and tell them to do a post instead.
00:24:46.000 --> 00:24:49.000 Otherwise,
00:24:49.000 --> 00:25:00.000 We just run the template, which is the template I showed you a couple of minutes ago and pass in the tools, which it then expands into the web page.
00:25:00.000 --> 00:25:01.000 But…
00:25:01.000 --> 00:25:06.000 the actual work of the MCP.
00:25:06.000 --> 00:25:10.000 Is all done behind a post.
00:25:10.000 --> 00:25:15.000 So this is this piece of code is a bit more complicated and we will look at that.
00:25:15.000 --> 00:25:20.000 Soon.
00:25:20.000 --> 00:25:25.000 Okay, so…
00:25:25.000 --> 00:25:34.000 The interaction, the request and the response are all done using JSON RPC.
00:25:34.000 --> 00:25:41.000 Uh, so we need to set the content type to return application JSON.
00:25:41.000 --> 00:25:44.000 And the
00:25:44.000 --> 00:25:50.000 the JSON that defines the call that the client is making.
00:25:50.000 --> 00:25:53.000 is in the
00:25:53.000 --> 00:25:56.000 body. So we get the request body.
00:25:56.000 --> 00:26:06.000 Parse it from JSON into a Perl data structure and store that in the request.
00:26:06.000 --> 00:26:07.000 variable.
00:26:07.000 --> 00:26:11.000 Make sure that we do a little bit of validation that what we've got is the correct thing.
00:26:11.000 --> 00:26:18.000 This minus 32,000 is a, uh,
00:26:18.000 --> 00:26:33.000 A value that is defined in the JSON RPC specification, and if you were to say to me, Dave, that's ridiculous having a magic number like that in your code, you should really have it as a symbolic
00:26:33.000 --> 00:26:44.000 constant, I would say you are absolutely right, and that's one of the issues that I need to fix very soon.
00:26:44.000 --> 00:26:50.000 Then we extract the method.
00:26:50.000 --> 00:26:53.000 From the request.
00:26:53.000 --> 00:26:55.000 Uh, and then we basically
00:26:55.000 --> 00:27:01.000 dispatch on whatever the method is and doing
00:27:01.000 --> 00:27:06.000 whatever clever stuff we need to do in order to get the data.
00:27:06.000 --> 00:27:19.000 which initialize, we get the initialize data and we'll return that. If it's tools list, we get the tools data and we return that. Both of these are pretty much hard coded.
00:27:19.000 --> 00:27:23.000 Or they're at least, um…
00:27:23.000 --> 00:27:27.000 uh, filled in from the…
00:27:27.000 --> 00:27:34.000 YAML file that we've talked about before.
00:27:34.000 --> 00:27:49.000 Something we should just quickly mention is all of these JSON RPC calls have an ID in them. Nothing magic to that at all. It's just an ID. It's just a string or a number that the…
00:27:49.000 --> 00:27:53.000 Client assigned to a request.
00:27:53.000 --> 00:27:58.000 And the server echoes that.
00:27:58.000 --> 00:28:02.000 ID back in the response so that the
00:28:02.000 --> 00:28:09.000 A client can tie up requests and responses, which allows them to fire off multiple requests.
00:28:09.000 --> 00:28:19.000 At the same time, and work out which response matches each request.
00:28:19.000 --> 00:28:23.000 So what does calling a…
00:28:23.000 --> 00:28:26.000 at all actually look like?
00:28:26.000 --> 00:28:31.000 This is the JSON that would be in the body of a call.
00:28:31.000 --> 00:28:35.000 Um, to find the version of JSON RPC that we're using.
00:28:35.000 --> 00:28:43.000 Give it an ID. Again, that's just a number that's made up by the client. Tell it which method we actually want to call.
00:28:43.000 --> 00:28:53.000 then give it the parameters and the essential parameter is obviously the name of the tool that we're calling.
00:28:53.000 --> 00:28:55.000 And then arguments.
00:28:55.000 --> 00:29:01.000 the arguments that were in the input specification, the input schema.
00:29:01.000 --> 00:29:05.000 Um…
00:29:05.000 --> 00:29:11.000 And then, in the code, and we'll dig into the code very soon.
00:29:11.000 --> 00:29:13.000 Uh…
00:29:13.000 --> 00:29:16.000 We have, um…
00:29:16.000 --> 00:29:20.000 a reference to the… to our model layer.
00:29:20.000 --> 00:29:25.000 And in the model layer, we just call these two methods.
00:29:25.000 --> 00:29:29.000 That we talked about.
00:29:29.000 --> 00:29:39.000 The methods that already existed in the model layer. So I haven't had to write any
00:29:39.000 --> 00:29:42.000 line of succession-specific code, because I'm just using code
00:29:42.000 --> 00:29:51.000 that already exists in the application. The only code that I'm writing here is
00:29:51.000 --> 00:29:55.000 scaffolding code for how the MCP.
00:29:55.000 --> 00:29:57.000 works. So…
00:29:57.000 --> 00:30:03.000 On that note, let's have a…
00:30:03.000 --> 00:30:05.000 We're going to look at two
00:30:05.000 --> 00:30:09.000 Modules here. Firstly,
00:30:09.000 --> 00:30:13.000 Succession.pm is the main.
00:30:13.000 --> 00:30:19.000 driver for the whole application.
00:30:19.000 --> 00:30:24.000 Um, and as I mentioned earlier, we do a post to the.
00:30:24.000 --> 00:30:29.000 MCP.
00:30:29.000 --> 00:30:33.000 root and that executes this code.
00:30:33.000 --> 00:30:37.000 We've got an MCP object, which we'll be looking at.
00:30:37.000 --> 00:30:40.000 in a second.
00:30:40.000 --> 00:30:42.000 And basically all it needs…
00:30:42.000 --> 00:30:44.000 is the…
00:30:44.000 --> 00:30:52.000 the tool file and we use path tiny to do clever things to get the tool file.
00:30:52.000 --> 00:31:00.000 Uh, we already saw the code that gets the request body and works out whether it's a valid request.
00:31:00.000 --> 00:31:02.000 We extract the ID and the method.
00:31:02.000 --> 00:31:05.000 Um, if there's no…
00:31:05.000 --> 00:31:13.000 if there's no ID, then something's gone wrong.
00:31:13.000 --> 00:31:20.000 If we call the initialize method, as I said, this is hard-coded. Actually, let's look in MCP.
00:31:20.000 --> 00:31:24.000 And here's the initialized data and it really is just hard coded.
00:31:24.000 --> 00:31:27.000 of a hash.
00:31:27.000 --> 00:31:37.000 Um, which basically I just copied from MCP specs.
00:31:37.000 --> 00:31:45.000 If it's calling tools list,
00:31:45.000 --> 00:31:47.000 That's, um…
00:31:47.000 --> 00:31:51.000 Up here, I think.
00:31:51.000 --> 00:31:54.000 Oh, no, calls tools.
00:31:54.000 --> 00:32:02.000 But again, it just looks at the tools, which is the data that we've got from the YAML file.
00:32:02.000 --> 00:32:05.000 runs a map that pulls out.
00:32:05.000 --> 00:32:09.000 useful pieces of information.
00:32:09.000 --> 00:32:12.000 Um.
00:32:12.000 --> 00:32:15.000 But the more interesting one is
00:32:15.000 --> 00:32:16.000 is cool.
00:32:16.000 --> 00:32:18.000 All tour…
00:32:18.000 --> 00:32:23.000 Which does a lot of the same kind of things.
00:32:23.000 --> 00:32:24.000 Um, for the bike.
00:32:24.000 --> 00:32:28.000 Basically, it needs to dispatch on the
00:32:28.000 --> 00:32:32.000 name of the tool that you're trying to call.
00:32:32.000 --> 00:32:36.000 Uh, so if the name is sovereign on date, it gets the sovereign on date.
00:32:36.000 --> 00:32:43.000 It extracts various useful pieces of information.
00:32:43.000 --> 00:32:45.000 Um.
00:32:45.000 --> 00:32:48.000 Um, one.
00:32:48.000 --> 00:32:54.000 Interesting thing to note here. So we've built up this.
00:32:54.000 --> 00:32:55.000 hash
00:32:55.000 --> 00:32:58.000 of all the interesting data.
00:32:58.000 --> 00:33:03.000 Well, then we convert it to text.
00:33:03.000 --> 00:33:06.000 And we return.
00:33:06.000 --> 00:33:17.000 We've got this method called tool result, which actually builds the result that we need to return to the client. And we pass it both the data version.
00:33:17.000 --> 00:33:19.000 and the textual version.
00:33:19.000 --> 00:33:22.000 We'll look at that in a second, but…
00:33:22.000 --> 00:33:26.000 The same thing is going on with the line of succession.
00:33:26.000 --> 00:33:35.000 tool. We get the data, which again is just calling a method that I already had.
00:33:35.000 --> 00:33:41.000 We can we convert it we sorry, we build a textual version.
00:33:41.000 --> 00:33:47.000 of that line of succession, and then we call tool result, passing both
00:33:47.000 --> 00:33:49.000 versions of the results.
00:33:49.000 --> 00:33:54.000 Because if we go into Tool Results.
00:33:54.000 --> 00:33:57.000 You see, it gets…
00:33:57.000 --> 00:33:59.000 data and text.
00:33:59.000 --> 00:34:09.000 Because it returns the text as content and the data as a thing called structured content.
00:34:09.000 --> 00:34:16.000 So the LLM or whatever AI tool it is that's calling this.
00:34:16.000 --> 00:34:22.000 back the data in two different…
00:34:22.000 --> 00:34:33.000 formats, it gets a plain text that it can pass, because it's a clever AI tool, or it gets structured data, which it can pull apart and
00:34:33.000 --> 00:34:42.000 Maybe get more useful information out of.
00:34:42.000 --> 00:34:45.000 Yeah, so the adapter is…
00:34:45.000 --> 00:34:49.000 uh, doing date passing, we saw that.
00:34:49.000 --> 00:34:57.000 The default date is today. The default list size is 10.
00:34:57.000 --> 00:35:04.000 Um, but because when I was showing you the actual website, you will see that
00:35:04.000 --> 00:35:06.000 Um, .
00:35:06.000 --> 00:35:09.000 We only store 30.
00:35:09.000 --> 00:35:15.000 people's names for each date, and that's something that I'll want to expand later.
00:35:15.000 --> 00:35:21.000 But currently, our maximum list size has to be 30 because that's all the data that I have.
00:35:21.000 --> 00:35:26.000 So yes, this is just reiterating.
00:35:26.000 --> 00:35:28.000 The response…
00:35:28.000 --> 00:35:30.000 structure.
00:35:30.000 --> 00:35:33.000 And as I said, we get…
00:35:33.000 --> 00:35:35.000 Content.
00:35:35.000 --> 00:35:38.000 And a textual version of it.
00:35:38.000 --> 00:35:50.000 I guess there might be some other way, some other values you can put for the type here. I don't know. I haven
00:35:50.000 --> 00:35:52.000 version, so that the…
00:35:52.000 --> 00:35:58.000 the AI tool, can choose what it wants to do.
00:35:58.000 --> 00:36:02.000 Which version of the data it finds most useful.
00:36:02.000 --> 00:36:06.000 We need to deal with errors at two different levels.
00:36:06.000 --> 00:36:14.000 JSON RPC has its own validation rules.
00:36:14.000 --> 00:36:27.000 those long numbers, 32,000 minus 32,000 something, we need to deal with those in a way that's defined by the JSON RPC spec.
00:36:27.000 --> 00:36:35.000 But also we have our own errors within the tool where we have to deal with.
00:36:35.000 --> 00:36:45.000 past an invalid date or a tool that we don't know anything about, things like that.
00:36:45.000 --> 00:36:47.000 Um, so, okay, we've written.
00:36:47.000 --> 00:36:49.000 I…
00:36:49.000 --> 00:36:51.000 MCP server.
00:36:51.000 --> 00:36:55.000 We've incorporated it in our.
00:36:55.000 --> 00:36:57.000 existing code.
00:36:57.000 --> 00:37:01.000 How do we actually, um,
00:37:01.000 --> 00:37:03.000 Get to use it.
00:37:03.000 --> 00:37:10.000 Um, and there are a number of ways that we can use it. We can use curl.
00:37:10.000 --> 00:37:14.000 Um, I saw that earlier this week.
00:37:14.000 --> 00:37:29.000 Mohammed had released appMCP CLI to CPAN. I had a quick try with it and I couldn't get it to work with my MCP. I don't know whether that's me or him that's broken stuff.
00:37:29.000 --> 00:37:43.000 Um, but that will… I mean, it was only version 0.01, so we'll see what happens with that. Or, and nice and easy is we can add the MCP to a
00:37:43.000 --> 00:37:45.000 Chat interface.
00:37:45.000 --> 00:37:49.000 Now let's have a look at some of these.
00:37:49.000 --> 00:37:53.000 Examples.
00:37:53.000 --> 00:37:57.000 I can never remember.
00:37:57.000 --> 00:38:00.000 Uh, detailed…
00:38:00.000 --> 00:38:02.000 Co. Come on.
00:38:02.000 --> 00:38:04.000 bones.
00:38:04.000 --> 00:38:07.000 So I've written a couple of
00:38:07.000 --> 00:38:09.000 Little programs.
00:38:09.000 --> 00:38:11.000 But cool.
00:38:11.000 --> 00:38:14.000 My.
00:38:14.000 --> 00:38:16.000 server.
00:38:16.000 --> 00:38:21.000 This one calls the initialize method.
00:38:21.000 --> 00:38:23.000 Here you can see the request.
00:38:23.000 --> 00:38:26.000 .
00:38:26.000 --> 00:38:30.000 Jason, that it builds up, calling the method initialize.
00:38:30.000 --> 00:38:37.000 Just some information about the protocol version and stuff like that. And then it just passes that to curl.
00:38:37.000 --> 00:38:43.000 with the correct content type and the correct accept.
00:38:43.000 --> 00:38:46.000 And so if we run…
00:38:46.000 --> 00:38:50.000 been initialized.
00:38:50.000 --> 00:39:00.000 That's the result coming back from my live server.
00:39:00.000 --> 00:39:03.000 Um, and as I said,
00:39:03.000 --> 00:39:16.000 In my use case, we don't do anything useful at the initialized stage, but we still need to have it. I've given this a dash P so that we can see
00:39:16.000 --> 00:39:22.000 Um, the payload that is passed into it.
00:39:22.000 --> 00:39:25.000 And then the response that comes back.
00:39:25.000 --> 00:39:33.000 Things get more interesting when you run.
00:39:33.000 --> 00:39:40.000 Tools list.
00:39:40.000 --> 00:39:46.000 Because you're getting back the list of the tools that we support.
00:39:46.000 --> 00:39:47.000 Um.
00:39:47.000 --> 00:39:52.000 There's a name sovereign on date. There's the description of it so that the…
00:39:52.000 --> 00:39:59.000 LLM knows why it might call that. And here's the information about the.
00:39:59.000 --> 00:40:01.000 Uh…
00:40:01.000 --> 00:40:03.000 The format, the…
00:40:03.000 --> 00:40:07.000 properties, so it accepts. And then down here we
00:40:07.000 --> 00:40:08.000 have.
00:40:08.000 --> 00:40:10.000 The line of succession.
00:40:10.000 --> 00:40:12.000 One.
00:40:12.000 --> 00:40:14.000 Um, and again,
00:40:14.000 --> 00:40:20.000 And well, we saw this in the YAML, didn't we?
00:40:20.000 --> 00:40:22.000 That it…
00:40:22.000 --> 00:40:24.000 that its properties are date,
00:40:24.000 --> 00:40:27.000 and limit.
00:40:27.000 --> 00:40:31.000 And again, if I give it a dot
00:40:31.000 --> 00:40:36.000 minus P.
00:40:36.000 --> 00:40:39.000 So that's the call.
00:40:39.000 --> 00:40:44.000 I've just given it a random number as an ID. Just…
00:40:44.000 --> 00:40:46.000 Tools list and
00:40:46.000 --> 00:40:47.000 gives me back.
00:40:47.000 --> 00:40:50.000 The list of the tools.
00:40:50.000 --> 00:40:59.000 And then, probably most interesting is what happens if we run tools.
00:40:59.000 --> 00:41:00.000 Cool.
00:41:00.000 --> 00:41:13.000 We need to give it at least the name of a tool. So we give it.
00:41:13.000 --> 00:41:22.000 And now that's going to default to today, I think.
00:41:22.000 --> 00:41:27.000 I'm sorry, yeah, here, so here you can see, as I said, we get the, we get a text version.
00:41:27.000 --> 00:41:34.000 that return data and then we get a structured version.
00:41:34.000 --> 00:41:38.000 And again, if we
00:41:38.000 --> 00:41:40.000 minus P.
00:41:40.000 --> 00:41:43.000 It shows us here the
00:41:43.000 --> 00:41:48.000 cool that it has made, and there are no arguments in this version.
00:41:48.000 --> 00:41:51.000 But we can again…
00:41:51.000 --> 00:41:54.000 Also…
00:41:54.000 --> 00:41:56.000 Give it.
00:41:56.000 --> 00:42:02.000 This is where I have to type raw JSON.
00:42:02.000 --> 00:42:06.000 Without making a mistake.
00:42:06.000 --> 00:42:11.000 1948.
00:42:11.000 --> 00:42:12.000 Stephanie.
00:42:12.000 --> 00:42:15.000 for change
00:42:15.000 --> 00:42:25.000 18.
00:42:25.000 --> 00:42:27.000 Yeah, and now it's filled in.
00:42:27.000 --> 00:42:30.000 State argument.
00:42:30.000 --> 00:42:32.000 And it tells you that
00:42:32.000 --> 00:42:35.000 George VI was the king.
00:42:35.000 --> 00:42:41.000 And if we change this to…
00:42:41.000 --> 00:42:42.000 9.
00:42:42.000 --> 00:42:43.000 of…
00:42:43.000 --> 00:42:45.000 Succession.
00:42:45.000 --> 00:42:49.000 And we add a…
00:42:49.000 --> 00:42:52.000 Limit.
00:42:52.000 --> 00:42:54.000 Ray.
00:42:54.000 --> 00:42:57.000 We will get the first
00:42:57.000 --> 00:43:02.000 three names on the line of succession.
00:43:02.000 --> 00:43:04.000 On that date.
00:43:04.000 --> 00:43:09.000 And you'll see the text just has these ugly.
00:43:09.000 --> 00:43:14.000 new lines, but the LLMs don't care about that.
00:43:14.000 --> 00:43:17.000 And down here we've got the proper.
00:43:17.000 --> 00:43:20.000 Uh, structured data.
00:43:20.000 --> 00:43:22.000 for the…
00:43:22.000 --> 00:43:27.000 Verse 3 people in the line of succession.
00:43:27.000 --> 00:43:30.000 So, yeah, we can call it…
00:43:30.000 --> 00:43:32.000 like this.
00:43:32.000 --> 00:43:35.000 But probably…
00:43:35.000 --> 00:43:37.000 Um,
00:43:37.000 --> 00:43:39.000 Most interesting.
00:43:39.000 --> 00:43:44.000 Uh, now here I have…
00:43:44.000 --> 00:43:46.000 Claude?
00:43:46.000 --> 00:43:50.000 And if you go to your…
00:43:50.000 --> 00:43:54.000 Settings in Claw and select connectors.
00:43:54.000 --> 00:44:02.000 Um, then you can look at the kind of tools that you've already got set up.
00:44:02.000 --> 00:44:05.000 And we can add a custom connector.
00:44:05.000 --> 00:44:08.000 Call it line of…
00:44:08.000 --> 00:44:10.000 succession.
00:44:10.000 --> 00:44:20.000 of it.
00:44:20.000 --> 00:44:28.000 The correct URL.
00:44:28.000 --> 00:44:35.000 Without a typo.
00:44:35.000 --> 00:44:38.000 There's no sign-in for this, because it's just public information.
00:44:38.000 --> 00:44:43.000 You've got the option to add new headers.
00:44:43.000 --> 00:44:47.000 So we add that.
00:44:47.000 --> 00:44:50.000 So now we've got a new connector.
00:44:50.000 --> 00:44:55.000 Listed, line of succession.
00:44:55.000 --> 00:44:59.000 If we…
00:44:59.000 --> 00:45:01.000 Who's that?
00:45:01.000 --> 00:45:06.000 and go to A.
00:45:06.000 --> 00:45:25.000 chat window, we can we can ask it.
00:45:25.000 --> 00:45:28.000 And you see it's using…
00:45:28.000 --> 00:45:31.000 of succession sovereign on date.
00:45:31.000 --> 00:45:35.000 It's told us that
00:45:35.000 --> 00:45:47.000 Queen Elizabeth, Elizabeth II, which is correct. Uh, and it's also grabbed some more information. This doesn't come from my tool.
00:45:47.000 --> 00:45:52.000 So it's mixed in some of its own knowledge.
00:45:52.000 --> 00:45:59.000 And we can also go.
00:45:59.000 --> 00:46:00.000 Tell me the…
00:46:00.000 --> 00:46:02.000 Top 10 people.
00:46:02.000 --> 00:46:06.000 people on the.
00:46:06.000 --> 00:46:15.000 Well, I know session on
00:46:15.000 --> 00:46:20.000 6th of Feb 1952, which I just happened to just happen.
00:46:20.000 --> 00:46:23.000 happen to know is the date that Queen Elizabeth II.
00:46:23.000 --> 00:46:26.000 to the throne.
00:46:26.000 --> 00:46:34.000 And again, it's loading my tool.
00:46:34.000 --> 00:46:40.000 And there are the names of the people. Now, I mean…
00:46:40.000 --> 00:46:46.000 Not that maybe you're interested, but it's interesting for me to note that it's got.
00:46:46.000 --> 00:46:54.000 It caused Prince Charles, the Duke of Cornwall, because that's the title that he held on that day because he hadn't been made Prince of Wales yet.
00:46:54.000 --> 00:46:56.000 Um.
00:46:56.000 --> 00:47:04.000 So yes, it's relatively easy to.
00:47:04.000 --> 00:47:14.000 add a connection to my MCP into your Claude chat. You can do exactly the same thing in a.
00:47:14.000 --> 00:47:20.000 ChatGPT chat, and I'm sure whatever you use.
00:47:20.000 --> 00:47:30.000 Brock or whatever the meta one's called or Gemini.
00:47:30.000 --> 00:47:35.000 Oh, right, yeah, so here's just an example.
00:47:35.000 --> 00:47:39.000 Uh, you add it.
00:47:39.000 --> 00:47:49.000 Um, so I was going to do a demo of a complete round trip.
00:47:49.000 --> 00:47:51.000 I mean, we…
00:47:51.000 --> 00:47:56.000 We've pretty much done this anyway.
00:47:56.000 --> 00:47:59.000 Oh, so there's the line of succession.
00:47:59.000 --> 00:48:04.000 On the 14th of November.
00:48:04.000 --> 00:48:14.000 1948, but that's not a random day, that's the day that Prince Charles was born. And so we've got Princess Elizabeth, the Queen.
00:48:14.000 --> 00:48:20.000 Charles and Princess Margaret and it says:
00:48:20.000 --> 00:48:29.000 Compare the answer with the website.
00:48:29.000 --> 00:48:33.000 The date that Charles was born.
00:48:33.000 --> 00:48:35.000 And there's the first three names.
00:48:35.000 --> 00:48:43.000 Miss Elizabeth, Prince Charles, Princess Mahal. Now, that shouldn't as a surprise, because as I've been
00:48:43.000 --> 00:48:46.000 At great pains to point out, the
00:48:46.000 --> 00:48:51.000 Data comes from exactly the same place. It comes from cooling exactly the same.
00:48:51.000 --> 00:48:56.000 methods.
00:48:56.000 --> 00:48:58.000 Um,
00:48:58.000 --> 00:49:07.000 So we can also do compare the first five successors on these two dates.
00:49:07.000 --> 00:49:14.000 Once you've typed one of these JSONs, it's easy enough to.
00:49:14.000 --> 00:49:16.000 Edit it to type other ones.
00:49:16.000 --> 00:49:24.000 Uh, what was February 7th.
00:49:24.000 --> 00:49:26.000 Five people.
00:49:26.000 --> 00:49:31.000 white people.
00:49:31.000 --> 00:49:35.000 Prince Charles, Princess Anne.
00:49:35.000 --> 00:49:42.000 Princess Margaret and then the Duke of Gloucester and Prince William of Gloucester.
00:49:42.000 --> 00:49:46.000 And then we've got the textual version.
00:49:46.000 --> 00:49:48.000 And then it says…
00:49:48.000 --> 00:49:56.000 Compare it with the 9th of September. Oh, so that it's chosen those two dates.
00:49:56.000 --> 00:50:00.000 Because they are the first and last dates of…
00:50:00.000 --> 00:50:03.000 Elizabeth's seconds.
00:50:03.000 --> 00:50:11.000 Rain. You're not interested in that, are you?
00:50:11.000 --> 00:50:15.000 Oh, and there I've got an error because I've got the date format wrong.
00:50:15.000 --> 00:50:20.000 Because 00 is not valid.
00:50:20.000 --> 00:50:24.000 Day of the month.
00:50:24.000 --> 00:50:26.000 And there you have…
00:50:26.000 --> 00:50:28.000 Prince William.
00:50:28.000 --> 00:50:32.000 Prince George, Princess Charlotte, Prince Louis.
00:50:32.000 --> 00:50:34.000 and Prince Henry, Prince Harry.
00:50:34.000 --> 00:50:40.000 He's obviously better known.
00:50:40.000 --> 00:50:54.000 Okay, so that was pretty much all I had to tell you. That's what made it straightforward was the fact that I got a domain model. If there's one lesson that you should take away from this.
00:50:54.000 --> 00:50:58.000 having a domain model is cool.
00:50:58.000 --> 00:51:09.000 Uh, so the tool definitions describe the kind of useful questions that you might want to ask, and then the adapter translates those requests and turns them into.
00:51:09.000 --> 00:51:12.000 into calls to the model.
00:51:12.000 --> 00:51:14.000 already exist.
00:51:14.000 --> 00:51:27.000 Some things that I might want to do to it next, most importantly, I realize that there's probably modules there on CPAM which handle the JSON RPC stuff for me.
00:51:27.000 --> 00:51:34.000 Whereas I'm writing it all myself from hand, by hand.
00:51:34.000 --> 00:51:40.000 Maybe I'll add some more tools, I'm not entirely sure what they'd be, but maybe people would find other.
00:51:40.000 --> 00:51:46.000 of information useful.
00:51:46.000 --> 00:52:03.000 I showed you writing up a connection to Claude. There's another layer above that that you can do in both ChatGPT and Claude. You can wrap it up in a plugin, which makes it just even easier for people that
00:52:03.000 --> 00:52:13.000 Don't really understand what a URL is. They don't need to have that, have a look at that slightly scary looking setup.
00:52:13.000 --> 00:52:14.000 uh, dial…
00:52:14.000 --> 00:52:16.000 lockbox.
00:52:16.000 --> 00:52:19.000 Uh, and then there's, um, I'm…
00:52:19.000 --> 00:52:27.000 I'm starting to wonder whether there's a way to write a dancer to plug in that
00:52:27.000 --> 00:52:38.000 does all the top-level scaffolding and just calls to callback functions to actually do the working out what the data is.
00:52:38.000 --> 00:52:41.000 I haven't really started thinking about that, but it's just…
00:52:41.000 --> 00:52:44.000 at the back of my mind.
00:52:44.000 --> 00:52:47.000 Um, so, in summary,
00:52:47.000 --> 00:52:53.000 watching existing models make writing new interfaces much easier.
00:52:53.000 --> 00:52:58.000 Write useful tools to give the assistants a reason to call.
00:52:58.000 --> 00:53:08.000 And the MCP standardizes discovery and invocation and makes it easy to
00:53:08.000 --> 00:53:12.000 put it on top of your existing model.
00:53:12.000 --> 00:53:17.000 We'll go to questions, uh…
00:53:17.000 --> 00:53:20.000 But some resources, so that's where the…
00:53:20.000 --> 00:53:29.000 where the MCP actually lives, the code for the whole website, including the MCP is on GitHub.
00:53:29.000 --> 00:53:36.000 And I wrote a blog post about it back in May when I first wrote the
00:53:36.000 --> 00:53:41.000 start the MCP so that you might find that interesting too.
00:53:41.000 --> 00:53:46.000 Um, how about that? That was just under…
00:53:46.000 --> 00:53:47.000 An hour.
00:53:47.000 --> 00:53:55.000 So I can't see any Zoom stuff.
00:53:55.000 --> 00:53:56.000 Oh, there you go.
00:53:56.000 --> 00:54:04.000 So Dave, that was. That's that was an excellent.
00:54:04.000 --> 00:54:05.000 I can see, questions.
00:54:05.000 --> 00:54:06.000 presentation. Thank you very much. There are, I think even I have.
00:54:06.000 --> 00:54:14.000 I have some questions and there are some questions in the chat, so I'm going to read you the questions so you don't have to open the
00:54:14.000 --> 00:54:23.000 window, the first came in a while ago. Do you put any AI scraping denial on your website?
00:54:23.000 --> 00:54:28.000 Um.
00:54:28.000 --> 00:54:36.000 Over the last year, when it's come round to renew all of my domains and I have far too many domains.
00:54:36.000 --> 00:54:37.000 I, uh…
00:54:37.000 --> 00:54:41.000 have been moving all my domains to Cloudflare.
00:54:41.000 --> 00:54:56.000 And that's part of their standard, um, offering, the standard service that they offer as your onboarding a domain, they ask you what the setting is, what setting you want to put for
00:54:56.000 --> 00:55:04.000 AI scrapers. Now, I know that.
00:55:04.000 --> 00:55:11.000 Even just in the Pearl community, we've had a lot of problems with.
00:55:11.000 --> 00:55:17.000 AI scrapers bringing websites down. I think Pearl Mugs has had that problem.
00:55:17.000 --> 00:55:20.000 Um, and…
00:55:20.000 --> 00:55:23.000 CPAN testers as well.
00:55:23.000 --> 00:55:25.000 But…
00:55:25.000 --> 00:55:28.000 My websites never get
00:55:28.000 --> 00:55:30.000 Hardly any traffic.
00:55:30.000 --> 00:55:34.000 Um, so, and I think given that…
00:55:34.000 --> 00:55:38.000 I'm a big fan of using AI to.
00:55:38.000 --> 00:55:49.000 Extract information from websites. It would be slightly hypocritical of me to stop other people from doing it on my websites. So, generally, I.
00:55:49.000 --> 00:55:51.000 um, allow.
00:55:51.000 --> 00:55:56.000 AI scrapers, access to most of my websites.
00:55:56.000 --> 00:56:04.000 But I am monitoring that. If it causes a problem, then obviously I will take action.
00:56:04.000 --> 00:56:10.000 Okay.
00:56:10.000 --> 00:56:11.000 Um.
00:56:11.000 --> 00:56:14.000 The MCP server side, do you have any rate limiting in place such as maximum number of requests per second?
00:56:14.000 --> 00:56:19.000 Same as the previous answer, I guess.
00:56:19.000 --> 00:56:22.000 I get, uh…
00:56:22.000 --> 00:56:28.000 My most popular website is the line of succession website.
00:56:28.000 --> 00:56:30.000 I get…
00:56:30.000 --> 00:56:37.000 A few thousand hits on that every day, so that's not troubling the server in the slightest.
00:56:37.000 --> 00:56:40.000 Uh…
00:56:40.000 --> 00:56:47.000 If I can be slightly stereotypical, I think my main
00:56:47.000 --> 00:56:55.000 My main visitor archetype on that website is middle age.
00:56:55.000 --> 00:57:08.000 American women who are interested in the British royal family. I don't know how much use they're going to be making of the MCP. So I haven't looked at…
00:57:08.000 --> 00:57:18.000 Rate limiting it yet. It's only been live a couple of months and it's caused no problems whatsoever. But again, something that I will monitor.
00:57:18.000 --> 00:57:22.000 Is it being used? Can you see that if it's being used?
00:57:22.000 --> 00:57:23.000 To be honest, I haven't…
00:57:23.000 --> 00:57:25.000 by others, except of you.
00:57:25.000 --> 00:57:31.000 Uh, I haven't looked at that. I haven't, um, the, the whole, um.
00:57:31.000 --> 00:57:44.000 The whole system is hosted in Cloud Run, Google Cloud Run. So yes, I need to look at I need to set up a report that shows me how.
00:57:44.000 --> 00:57:48.000 how often the MCP is being caught, and I haven't done that.
00:57:48.000 --> 00:57:54.000 How would people even know about the fact that you have an MCP server?
00:57:54.000 --> 00:57:56.000 Um…
00:57:56.000 --> 00:57:59.000 Well, it's advertised at the.
00:57:59.000 --> 00:58:03.000 Oh, we're on the wrong.
00:58:03.000 --> 00:58:07.000 Wrong, wrong, wrong, don't don't show. Yeah, private chats and things.
00:58:07.000 --> 00:58:10.000 No.
00:58:10.000 --> 00:58:15.000 Hang on.
00:58:15.000 --> 00:58:20.000 No, no, no, shut that down.
00:58:20.000 --> 00:58:27.000 Yeah.
00:58:27.000 --> 00:58:33.000 This should get me back to where I want to be.
00:58:33.000 --> 00:58:35.000 Yeah, sorry.
00:58:35.000 --> 00:58:43.000 Sorry, what was the question? Oh, how do people know? Oh, they know because
00:58:43.000 --> 00:58:44.000 of the enemy.
00:58:44.000 --> 00:58:56.000 I mean, it's on the slash MCP route. Okay, but
00:58:56.000 --> 00:58:57.000 Mm-hmm.
00:58:57.000 --> 00:58:58.000 I mean, there's a tiny link to it in the footer. So I haven't made a big song and dance of it. I have a line of succession blog.
00:58:58.000 --> 00:59:06.000 And I haven't even posted to it there because I don't think people are particularly going to be interested. It was an experiment for me to find out how
00:59:06.000 --> 00:59:11.000 easy it is to to do it more than anything.
00:59:11.000 --> 00:59:24.000 Yeah, I think it was more from me, it was more a little bit of theoretical question or generic question of how anyone would know about an MCP server.
00:59:24.000 --> 00:59:27.000 Oh, actually, um, there is…
00:59:27.000 --> 00:59:29.000 of a random website.
00:59:29.000 --> 00:59:38.000 Yeah, when I first set it up back in May, there are a couple of GitHub repos that list.
00:59:38.000 --> 00:59:50.000 But the power GitHub Pages websites that list MCP servers. So I've included it on there, but those are lists of hundreds of MTP servers.
00:59:50.000 --> 00:59:54.000 I don't know whether anybody would have found it through that.
00:59:54.000 --> 00:59:55.000 Yeah, so I know.
00:59:55.000 --> 01:00:03.000 You're right, I do have to set up a report to find out how used it's going to be or it's being.
01:00:03.000 --> 01:00:16.000 Yeah, so there is another question which is probably theoretical for not really relevant for you, but interesting in general. If a request takes 5 min to respond.
01:00:16.000 --> 01:00:21.000 How does one maintain the context of the conversation?
01:00:21.000 --> 01:00:25.000 Um…
01:00:25.000 --> 01:00:30.000 It's an interesting question. Like you say, for me, it's hypothetical, because
01:00:30.000 --> 01:00:33.000 my requests all come back in…
01:00:33.000 --> 01:00:37.000 A few seconds.
01:00:37.000 --> 01:00:38.000 Um…
01:00:38.000 --> 01:00:39.000 Okay.
01:00:39.000 --> 01:00:40.000 I mean, the ID would probably help.
01:00:40.000 --> 01:00:45.000 there, but…
01:00:45.000 --> 01:00:47.000 I don't…
01:00:47.000 --> 01:00:53.000 I don't think the concept of a conversation really exists at this level.
01:00:53.000 --> 01:00:57.000 The MCP is really answering one-off questions.
01:00:57.000 --> 01:01:01.000 the sovereign on this date.
01:01:01.000 --> 01:01:11.000 You don't, it doesn't have the concept of then saying, okay, and who was on the line of succession on the same day?
01:01:11.000 --> 01:01:13.000 That doesn't happen.
01:01:13.000 --> 01:01:14.000 Yeah, I mean.
01:01:14.000 --> 01:01:23.000 It would be up to the LLM or the AI client to hold that context and know that it's.
01:01:23.000 --> 01:01:25.000 Is it?
01:01:25.000 --> 01:01:31.000 It's like you've got a fining cabinet. You don't expect the filing cabinet to…
01:01:31.000 --> 01:01:40.000 remember which file you got out last time and give you the next file. It's just a dumb
01:01:40.000 --> 01:01:46.000 a dumb information store.
01:01:46.000 --> 01:01:48.000 Yeah.
01:01:48.000 --> 01:01:50.000 There was also question what is slug?
01:01:50.000 --> 01:01:55.000 Oh, so that's being asked because…
01:01:55.000 --> 01:02:00.000 Um, we get back slugs for every person.
01:02:00.000 --> 01:02:02.000 Oh, okay, I didn't even notice that one. Yeah.
01:02:02.000 --> 01:02:06.000 Um, and a slug is, uh,
01:02:06.000 --> 01:02:09.000 the unique identifier for
01:02:09.000 --> 01:02:14.000 the person on the website. If you
01:02:14.000 --> 01:02:19.000 If we look at the website,
01:02:19.000 --> 01:02:25.000 Not only are the dates all links, but the…
01:02:25.000 --> 01:02:32.000 names are all links as well, and if you… I don't know whether anyone can see, but if you look up here.
01:02:32.000 --> 01:02:39.000 The URL for a person page is P followed by the slug.
01:02:39.000 --> 01:02:40.000 Okay.
01:02:40.000 --> 01:02:45.000 So it's just a unique identifier for the page. And probably.
01:02:45.000 --> 01:02:55.000 Good API design would be to not return the slug, but to return the URL for the person.
01:02:55.000 --> 01:02:57.000 Yeah.
01:02:57.000 --> 01:03:07.000 So here's another question which I think, okay, whatever.
01:03:07.000 --> 01:03:08.000 Yes.
01:03:08.000 --> 01:03:18.000 Not related to your presentation, I think, but it's very interesting. Is Pearl an easy language for AI to master in your view? Have you tried Claude to implement line of suction?
01:03:18.000 --> 01:03:29.000 The line of succession website in Dancer 2 on its own, without looking at your code or looking it up on the internet.
01:03:29.000 --> 01:03:42.000 The thing is, that's the question. My comment here is that how would you even be able to do that, to tell.
01:03:42.000 --> 01:03:43.000 Well, I mean…
01:03:43.000 --> 01:03:50.000 Claude, or whoever, whatever, not to look at an existing one or not look at your existing one.
01:03:50.000 --> 01:04:00.000 I'm… I'm not about to throw away almost 10 years of work and replace it with vibe coding, but…
01:04:00.000 --> 01:04:06.000 I…
01:04:06.000 --> 01:04:08.000 I would say over the last…
01:04:08.000 --> 01:04:14.000 Couple of years, the amount of code that I actually write myself has fallen.
01:04:14.000 --> 01:04:19.000 fallen dramatically. I probably now write
01:04:19.000 --> 01:04:27.000 less than 5% of the code that I produce.
01:04:27.000 --> 01:04:28.000 Yeah.
01:04:28.000 --> 01:04:29.000 So,
01:04:29.000 --> 01:04:34.000 I'm… I'm not… well, I have tried vibe coding.
01:04:34.000 --> 01:04:41.000 But having got 30 years of experience of programming,
01:04:41.000 --> 01:04:44.000 Why?
01:04:44.000 --> 01:04:46.000 I'm happy to get…
01:04:46.000 --> 01:04:51.000 Claude or Codex to generate code for me.
01:04:51.000 --> 01:04:52.000 Um,
01:04:52.000 --> 01:04:57.000 But I like to read it. I like to understand what it is that I'm…
01:04:57.000 --> 01:05:03.000 put in live or uploading to CPAN or whatever. But if you've looked at code that I've written.
01:05:03.000 --> 01:05:08.000 Over the last two years probably, there is…
01:05:08.000 --> 01:05:15.000 Uh, only 20% and falling chance that it was actually written by
01:05:15.000 --> 01:05:19.000 me. Most of it would have been written by
01:05:19.000 --> 01:05:22.000 an agent.
01:05:22.000 --> 01:05:23.000 Hmm.
01:05:23.000 --> 01:05:33.000 Does that… I don't know whether that answers the question at all. I think Pearl is a perfectly easy eight, like, perfectly easy language for AIs to master.
01:05:33.000 --> 01:05:36.000 I sometimes have problems.
01:05:36.000 --> 01:05:38.000 Um, I have
01:05:38.000 --> 01:05:39.000 So…
01:05:39.000 --> 01:05:44.000 Keep in mind it that there are…
01:05:44.000 --> 01:05:50.000 modern Pearl con constructs, but once you put that
01:05:50.000 --> 01:05:53.000 the agent file.
01:05:53.000 --> 01:05:57.000 For a particular project, it knows that you want to use
01:05:57.000 --> 01:06:09.000 signature and postfix dereferencing and things like that, but left to its own devices.
01:06:09.000 --> 01:06:15.000 It would often write something that looks like it came from 1995.
01:06:15.000 --> 01:06:19.000 Yeah, that's good. Yeah, that's a problem too.
01:06:19.000 --> 01:06:26.000 Okay, you also need to write it, please write code without bugs.
01:06:26.000 --> 01:06:27.000 Like
01:06:27.000 --> 01:06:30.000 Yes, but I mean, one of the first experiments that
01:06:30.000 --> 01:06:35.000 did with AI coding and I wrote a blog post about it, it's probably four years ago now.
01:06:35.000 --> 01:06:42.000 And I thought I'd be really clever, and I would… and I asked it to write a…
01:06:42.000 --> 01:06:45.000 Um, oppose…
01:06:45.000 --> 01:06:47.000 Earth's CPAN module for…
01:06:47.000 --> 01:06:57.000 interfacing with the OpenAI API, like a wrapper, you know, so Curtis now.
01:06:57.000 --> 01:07:08.000 maintains a really complex module that does that, but I thought I'd be one of the first person on CPAN. And it wrote me code.
01:07:08.000 --> 01:07:12.000 That just it didn't come, it didn't even compile.
01:07:12.000 --> 01:07:17.000 Yeah.
01:07:17.000 --> 01:07:18.000 Yeah.
01:07:18.000 --> 01:07:22.000 But that's four years ago and we've come an awful long way since then. I think I'm perfectly happy to trust most of my coding.
01:07:22.000 --> 01:07:23.000 agent.
01:07:23.000 --> 01:07:28.000 It happened to… it happened to me two days ago on ChatGPT with Python.
01:07:28.000 --> 01:07:34.000 that it wrote some code, and that it has a button now on ChatGPT to run it.
01:07:34.000 --> 01:07:51.000 And it failed to run it on ChatGPT. The code was actually good. And when I moved it to correctly set up machine, it ran and did exactly what I was expecting to do. But it's their own environment couldn't handle it.
01:07:51.000 --> 01:07:52.000 Yes, yes, I mean.
01:07:52.000 --> 01:07:54.000 So it seems really strange things.
01:07:54.000 --> 01:08:01.000 What I'm… I mean, I'm… a lot of what I write is,
01:08:01.000 --> 01:08:11.000 web stuff, and I'm fine, I'm getting a lot braver with JavaScript than I used to be. I mean, I'd learnt.
01:08:11.000 --> 01:08:24.000 JavaScript over the last 10 years or so, but I've never been particularly confident in it. But now I just asked Claude to go away and write the JavaScript to do this clever thing on my web.
01:08:24.000 --> 01:08:29.000 And it mostly works most of the time.
01:08:29.000 --> 01:08:30.000 Very happy.
01:08:30.000 --> 01:08:31.000 Okay.
01:08:31.000 --> 01:08:51.000 Another comment is just a command that Michael says that my website biology database has been brought down by AI escapers.
01:08:51.000 --> 01:08:52.000 Mountbatten Windsor.
01:08:52.000 --> 01:08:55.000 Scrapers as well, then someone, Mark asks, and I'm going to mispronounce this name, Andrew Mountbutton visor still listed as number eight in the line of succession question.
01:08:55.000 --> 01:09:09.000 Yes, and that is accurate. I mean, let's not get into the politics of what's been going on with Andrew Mountbatten-Windsor over the last year.
01:09:09.000 --> 01:09:14.000 But His Royal.
01:09:14.000 --> 01:09:22.000 privileges have slowly been chipped away at over the last.
01:09:22.000 --> 01:09:34.000 Well, five years, because his mother started it. She said he wasn't going to be a working royal. She said he couldn't be an HRH anymore, but it took until when his.
01:09:34.000 --> 01:09:37.000 Brother.
01:09:37.000 --> 01:09:51.000 became king and the police raid that happened about a year ago, at which point he stopped being a prince, he stopped being referred to as the Duke of York,
01:09:51.000 --> 01:10:04.000 The last thing that he still has is that he's on the line of succession. But the point there is that if you're eighth on the line of succession,
01:10:04.000 --> 01:10:07.000 Um, you're not going to become king.
01:10:07.000 --> 01:10:12.000 Uh, because…
01:10:12.000 --> 01:10:25.000 Five of the people above you are young children who are going to grow up and have children of their own, and they will all be higher than you in the… every time that one of William or Harry's children
01:10:25.000 --> 01:10:29.000 a child with their own, Andrew will move down another level.
01:10:29.000 --> 01:10:37.000 He's never going to be king. And in order to remove him from the line of succession, it has to be an act of parliament.
01:10:37.000 --> 01:10:41.000 And it has to be an act of Parliament that is ratified by all
01:10:41.000 --> 01:10:47.000 All of the countries that use the British line of succession for their monarchs.
01:10:47.000 --> 01:10:59.000 So it needs to be ratified by the Australian Parliament, the New Zealand Parliament, the Canadian Parliament. There are 14 other countries. And honestly.
01:10:59.000 --> 01:11:07.000 It's just not worth the parliamentary time. I would personally far rather that my… that the Parliament spent
01:11:07.000 --> 01:11:12.000 their time doing much more useful things than
01:11:12.000 --> 01:11:15.000 Yeah, okay.
01:11:15.000 --> 01:11:16.000 Yeah. Okay.
01:11:16.000 --> 01:11:19.000 being anchor from the line of succession. Sorry, that was too long for a let's get back to technical things.
01:11:19.000 --> 01:11:31.000 Yeah, yeah, yeah. A possible way to tell AI readers that a website has MCP functionality is to add it to the slash dot well known.
01:11:31.000 --> 01:11:37.000 or slash MCP dash server.
01:11:37.000 --> 01:11:38.000 I, I mean…
01:11:38.000 --> 01:11:39.000 file, I guess.
01:11:39.000 --> 01:11:40.000 The only time I…
01:11:40.000 --> 01:11:48.000 And wait a second, sorry. These are just conventions, like having slash feeds at the website root. Okay.
01:11:48.000 --> 01:11:49.000 Um, I…
01:11:49.000 --> 01:12:02.000 I'm absolutely sure that that's all true. The only time I've ever used dot well known as it's part of the.
01:12:02.000 --> 01:12:12.000 Let's encrypt automatic.
01:12:12.000 --> 01:12:17.000 Yeah.
01:12:17.000 --> 01:12:18.000 Yeah, yeah.
01:12:18.000 --> 01:12:20.000 certificate renewal. I didn't know that there were other uses for it. I would be fascinated to hear more about that. Someone write a blog post and I'll read it.
01:12:20.000 --> 01:12:21.000 Okay.
01:12:21.000 --> 01:12:33.000 Um, similar for my pro development, I've had good success with ChatGPT and Claude for generating Perl code. And recently implemented a local.
01:12:33.000 --> 01:12:48.000 So when QWEN, I don't know what that is based RUG pipeline that has REG, if my pronunciation doesn't work, pipeline that has access to our legacy code base.
01:12:48.000 --> 01:13:04.000 That required quite a lot, quite a bit of custom code to get the relationships just right as three sitter Python library most turnkey solution use. But okay, doesn't quite.
01:13:04.000 --> 01:13:12.000 Understand paragraph enough. Use the custom PPI-based processor to get the parsing right.
01:13:12.000 --> 01:13:14.000 Okay, so that was mostly just a comment. I don't know if…
01:13:14.000 --> 01:13:22.000 Yes, I do have a comment I'd like to push in at this point that
01:13:22.000 --> 01:13:31.000 Obviously, the coding that I'm doing is just mostly me and my websites, me and my personal.
01:13:31.000 --> 01:13:37.000 projects, I care about quality.
01:13:37.000 --> 01:13:52.000 But I'm not putting production code into situations where people are going to lose millions of dollars or it's going to put people's lives in danger. Obviously, if you're…
01:13:52.000 --> 01:13:58.000 working in a system that has more important effects.
01:13:58.000 --> 01:14:05.000 And you're going to need to have a lot more important.
01:14:05.000 --> 01:14:16.000 rules in place in order to make sure that the code that you put live is doing the right thing. And there are a couple of things that I would love you to.
01:14:16.000 --> 01:14:28.000 investigate Curtis Poe, who you probably all know as a well-known Pell programmer, has a…
01:14:28.000 --> 01:14:36.000 A project that he calls PAD, that's P-A-A-D. Oh, I see someone's already mentioning it.
01:14:36.000 --> 01:14:38.000 .
01:14:38.000 --> 01:14:50.000 in the chat as a series of skills for your agent to
01:14:50.000 --> 01:14:51.000 Work.
01:14:51.000 --> 01:14:59.000 I guess the idea is it makes them work more how a real programmer works.
01:14:59.000 --> 01:15:06.000 Um, so that's well worth looking at. Um, the other thing, and also from somebody who used to be really, um,
01:15:06.000 --> 01:15:14.000 Uh, big in the Pearl community is Jesse Vincent. Uh, he used to be the pumpkin back in 5.
01:15:14.000 --> 01:15:17.000 0.10 or something like that.
01:15:17.000 --> 01:15:22.000 When he has a project on GitHub called Superpowers.
01:15:22.000 --> 01:15:27.000 Which adds a lot of software engineering.
01:15:27.000 --> 01:15:43.000 I'm not going to say magic because it's engineering, but software engineering power to your agents and the models. So PAD and superpowers, both from people who have been big in the Perl world.
01:15:43.000 --> 01:15:49.000 some time, but two of the.
01:15:49.000 --> 01:15:53.000 Most popular, uh,
01:15:53.000 --> 01:15:59.000 agentic programming add-ons around at the moment. I think I can't
01:15:59.000 --> 01:16:14.000 remember the exact number, but Jesse recently, I saw him post somewhere that superpowers had reached something like the top 20 most starred projects on GitHub of all time.
01:16:14.000 --> 01:16:17.000 So people like these tools. Well worth looking at.
01:16:17.000 --> 01:16:21.000 Yeah, I heard about it. I didn't realize that's him. Okay.
01:16:21.000 --> 01:16:38.000 Oh, and yeah, so Scott was talking about how it's working in his company. There was a interview that Jesse Vincent was interviewed by Tim O'Reilly.
01:16:38.000 --> 01:16:39.000 Hmm.
01:16:39.000 --> 01:16:49.000 It's an O'Reilly thing, so you should be able to find it on YouTube just by googling their names. And it's, it was in the last two or three weeks.
01:16:49.000 --> 01:16:54.000 Uh, and Tim was asking him about how.
01:16:54.000 --> 01:16:58.000 Yes, he uses agents in his.
01:16:58.000 --> 01:17:06.000 company. And Jesse has one of these people. He's taken the approach of they actually have
01:17:06.000 --> 01:17:16.000 AIs who are employees of the company. They are they are colleagues, they are non-human colleagues working on the project as full.
01:17:16.000 --> 01:17:29.000 participants in the…
01:17:29.000 --> 01:17:30.000 Yeah.
01:17:30.000 --> 01:17:31.000 projects, and it's very interesting the way that they've been doing that. So I recommend that interview to you all.
01:17:31.000 --> 01:17:44.000 That's fascinating. Next comment here. I use cloud code agent a lot nowadays. I have the same problems, but telling Claude isn't enough. You need harness engineering.
01:17:44.000 --> 01:17:54.000 as this poor critic with lots of custom rules. For example, do not use evil, use try catch.
01:17:54.000 --> 01:17:55.000 Yeah, yeah.
01:17:55.000 --> 01:17:57.000 The file has used V5.40.
01:17:57.000 --> 01:18:02.000 I think that's the same thing that I'm saying. I mean, yes.
01:18:02.000 --> 01:18:09.000 the agent to use Pearl Critic is a really good start.
01:18:09.000 --> 01:18:10.000 Yeah.
01:18:10.000 --> 01:18:16.000 Looking into Pad and superpowers takes it to the next level or three levels up.
01:18:16.000 --> 01:18:23.000 Yeah, I mean, I probably tell the agent first to write the test that uses per critic.
01:18:23.000 --> 01:18:28.000 And then also tell it to also run those tests.
01:18:28.000 --> 01:18:29.000 Oh
01:18:29.000 --> 01:18:31.000 Yes, yes. I mean, I think,
01:18:31.000 --> 01:18:33.000 the…
01:18:33.000 --> 01:18:44.000 Getting into, uh, AI-driven programming is at the very least a really good reason to bring back test-driven.
01:18:44.000 --> 01:18:45.000 programming.
01:18:45.000 --> 01:18:53.000 Yeah, yeah, yeah. Knowing JavaScript is hard, is very hard. Okay.
01:18:53.000 --> 01:19:08.000 Models have no issues writing Perl code. Both cloud models available through APIs like Anthropic Cloud or even local ones, my locally running Ornit.
01:19:08.000 --> 01:19:23.000 5 and later teal coder, write Pearl that is correct and works just fine. Regarding the tools slash extensions slash skills, I found Curtis Pose.
01:19:23.000 --> 01:19:30.000 God, okay, that was you mentioned earlier, really useful as well as ThoughtWorks.
01:19:30.000 --> 01:19:34.000 SPDD.
01:19:34.000 --> 01:19:42.000 I don't know, SPDD, but that's obviously, yes, something else along the same lines as superpowers.
01:19:42.000 --> 01:19:49.000 Okay, uh, thank you, I will bounce out, but greatly appreciate the teachings.
01:19:49.000 --> 01:19:55.000 I forget to say that I put all those pro-critic tests into GitHooks. Yeah.
01:19:55.000 --> 01:19:57.000 Yeah.
01:19:57.000 --> 01:19:59.000 Okay…
01:19:59.000 --> 01:20:03.000 And I think I don't know. Oh, there is one more now. Event.
01:20:03.000 --> 01:20:08.000 And even this one is broken for me. Oh, uh…
01:20:08.000 --> 01:20:09.000 Yeah, GitHooks.
01:20:09.000 --> 01:20:12.000 Sorry.
01:20:12.000 --> 01:20:15.000 Ah, okay.
01:20:15.000 --> 01:20:23.000 Only Git hooks are 100% safe and can prevent Claude from repeating its mistakes. Okay, yeah, sure.
01:20:23.000 --> 01:20:25.000 Yeah, uh…
01:20:25.000 --> 01:20:36.000 GitHooks, maybe, or definitely running tests and having all these things in the test, whether.
01:20:36.000 --> 01:20:47.000 for the client, for the agent, or during the agent running, or after it, it's always a good idea, or definitely after it is a good idea to protect yourself from everything.
01:20:47.000 --> 01:20:49.000 Definitely, yeah, yeah.
01:20:49.000 --> 01:20:54.000 I mean, I have…
01:20:54.000 --> 01:21:01.000 I have little time for the people who say,
01:21:01.000 --> 01:21:08.000 You shouldn't write. You shouldn't use AI to write your code because it's just going to be.
01:21:08.000 --> 01:21:15.000 rubbish and stolen from everybody else because I just think it's a useful tool.
01:21:15.000 --> 01:21:19.000 Anyone that thinks it's rubbish hasn't tried it in the last two years.
01:21:19.000 --> 01:21:26.000 But equally, I don't buy the people who say that.
01:21:26.000 --> 01:21:33.000 programmers are all going to be out of a job by the end of next year because I think at the moment,
01:21:33.000 --> 01:21:34.000 Um,
01:21:34.000 --> 01:21:36.000 People.
01:21:36.000 --> 01:21:40.000 You need to have the experience that we all have.
01:21:40.000 --> 01:21:43.000 Um, in order to understand.
01:21:43.000 --> 01:21:47.000 How bad the code is or how good or bad the code is.
01:21:47.000 --> 01:21:59.000 The code is every week I hear a horror story about someone that vibe coded an app that they put on the Apple Store and then got.
01:21:59.000 --> 01:22:02.000 annoyed because…
01:22:02.000 --> 01:22:11.000 Three days later, it got popular and their server melted because they had no clue about scaling.
01:22:11.000 --> 01:22:12.000 Yeah.
01:22:12.000 --> 01:22:26.000 So, I think programmers are going to be needed for a while, but on the other hand, I am also quite glad that I'm at the end of my career and I consider myself semi-retired and I don't need to have a job as a programmer.
01:22:26.000 --> 01:22:28.000 Yeah.
01:22:28.000 --> 01:22:35.000 Okay, it's one other comment we need agent. We need an agent that was originally was.
01:22:35.000 --> 01:22:38.000 trained to write pure code. And I
01:22:38.000 --> 01:22:40.000 Yeah.
01:22:40.000 --> 01:22:47.000 Will Brushwell was working on something like that.
01:22:47.000 --> 01:22:48.000 That as you like.
01:22:48.000 --> 01:22:50.000 Okay. I have written…
01:22:50.000 --> 01:22:58.000 I have written a few custom MCP servers for our systems here, but they have been via
01:22:58.000 --> 01:23:15.000 God is Python scripts. However, one is connected to our testing pipeline, which uses Loki and Mimir to track failing tests and running module usage by our CI pipelines.
01:23:15.000 --> 01:23:25.000 In addition, I have one that tracks source commits, subversion is neat because it has it.
01:23:25.000 --> 01:23:34.000 We ask what's changed when the test started failing.
01:23:34.000 --> 01:23:35.000 Yeah.
01:23:35.000 --> 01:23:38.000 It also allows for us to run ad hoc CI tests on code changes during the day.
01:23:38.000 --> 01:23:39.000 Okay.
01:23:39.000 --> 01:23:44.000 Yeah, I mean, I feel like I should point out that
01:23:44.000 --> 01:24:00.000 Gabor thought he wanted a talk on MCP, and so he invited me because he'd read my blog post. I said, I don't know that I'm the right person because I don't really know very much about MCP. And he came back and said, well.
01:24:00.000 --> 01:24:11.000 You know more than anybody else that I know, so that's why I was talked into it. So, maybe I am the Pearl Communities
01:24:11.000 --> 01:24:27.000 Expert on MCP at the moment, but I'm certainly not the Pearl Community's expert on agentic.
01:24:27.000 --> 01:24:28.000 Yeah.
01:24:28.000 --> 01:24:35.000 programming for that, you really should see if you can get Jesse or Curtis to give one of these talks.
01:24:35.000 --> 01:24:36.000 I do know that, um…
01:24:36.000 --> 01:24:38.000 That's a good idea. I'll ask them, and maybe we'll have a session with them. 2 sessions with them.
01:24:38.000 --> 01:24:44.000 If I can do a small plug, I do know that, uh…
01:24:44.000 --> 01:24:51.000 Curtis is giving a talk at the London Pearl Workshop, which is a month today on the 21st of November.
01:24:51.000 --> 01:24:54.000 Um, and, um…
01:24:54.000 --> 01:24:58.000 That will definitely be on.
01:24:58.000 --> 01:25:01.000 AI programming.
01:25:01.000 --> 01:25:02.000 So that will be worth…
01:25:02.000 --> 01:25:03.000 Thank you.
01:25:03.000 --> 01:25:04.000 That's excellent. So go to London.
01:25:04.000 --> 01:25:09.000 If anyone can get to London for the day, I recommend it.
01:25:09.000 --> 01:25:22.000 Uh, excellent.
01:25:22.000 --> 01:25:23.000 Yeah, yeah.
01:25:23.000 --> 01:25:24.000 .
01:25:24.000 --> 01:25:31.000 Okay, I think it seems that we ran out of questions. I hope that you ran out of questions, because we need to finish at one point this session and actually, if people want to stay around, they are welcome, and then we can keep having the conversation.
01:25:31.000 --> 01:25:39.000 I got that in real time so people are going to speak and so on. So I'm…
01:25:39.000 --> 01:25:43.000 I would like to thank you again, really.
01:25:43.000 --> 01:26:01.000 Okay, so really thank you for this presentation and all the responses. And I would like to thank also to the people who participated and asked questions or didn't ask questions.
01:26:01.000 --> 01:26:16.000 adjuster here and listened. It was excellent. And if someone is watching on YouTube, then please click on the like button and follow the channel and below the video you will find the link to
01:26:16.000 --> 01:26:35.000 Some notes about this session, and I think and to Dave Cross, of course, there is a web page and low profiles, and maybe also to the slide. The slides, we can add them, maybe.
01:26:35.000 --> 01:26:36.000 Yeah.
01:26:36.000 --> 01:26:46.000 Yeah, I'll get the slides up somewhere very soon. Um, I've just put my email address in the chat. It's not hard to guess, it's dave at pearlhacks.com. PearlHacks is where I blog about Pearl. Um, I'm happy to answer any questions.
01:26:46.000 --> 01:26:50.000 email if anybody.
01:26:50.000 --> 01:26:51.000 Yeah.
01:26:51.000 --> 01:26:52.000 Once we get in touch.
01:26:52.000 --> 01:26:53.000 And thinks I can help.
01:26:53.000 --> 01:27:08.000 Thank you very much. And and again, if you're watching the video and you don't you will find the link to all these things below the video. There will be a link, and then you can find that information there. So thank you very much again. Now, I'm trying to click on the stop record.
01:27:08.000 --> 01:27:22.000 But my computer has issues, so maybe it won't work. So again, thank you very much and see you at the next event.
]]>Eugen Konkov is a Perl developer and the author of App::Ground and the DB::Hooks debugger. He enjoys building practical tools that simplify application development and debugging.
20 minutes
]]>This is a practical exploration of PAGI::FastAPI and its latest addition PAGI::FastAPI::Security that introduces you to modern asynchronous Perl web development if you have been using FastAPI in Python asking yourself why this can't be done in Perl. (Spoiler: it can now)
Mohammad Sajid Anwar is a CPAN author and White Camel award recipient, recognised for his sustained contributions to the Perl community. He is the author of "Design Patterns in Modern Perl" and the creator of "The Weekly Challenge", a long-running initiative since 2019. He is an editor of the Perl Weekly newsletter. He speaks regularly at Perl conferences and is an active mentor and contributor across the CPAN ecosystem.
30 min
David is a bit of geo-nerd so he collected the places that people joined from:
Ukraine (Kiev), Stockholm, UK (London & Norfolk), USA (New York, Minneapolis, Chicago, Lansing & Miami), Netherlands, Israel (Haifa & Modiin), Dublin, Barcelona, Munich, Hungary (Budapest), Germany and Nigeria (Lagos)!
Is PAGI or PAGI::FastAPI reverse proxy aware? Like PAGI talking HTTP to HAProxy and HAProxy talks to clients over HTTPS
How do I customise the automated docs? E.g. I want to add a description or request examples.
What about nested data validation? A flaw in using Type::Tiny for schema validation is that there isn’t a way to model "presence" (afaik, I could be wrong though).
I was a huge fan of Data::FormValidator (back in the day) :-)
Is event loop an internal detail? Can the program hook to it to wait for other events, e.g. file system?
Next to authentication, what about authorization and audit (AAA)?
Does PAGI or PAGI::FastAPI allow 'under' like Mojolicous?
I wanted to try it right now but unfortunately it's using Perl 5.38 and my system has 5.34. But definitely will try. I dont think its a big issue 🙂
Thank you Mohammad. This has been very informative. And thank you for the Weekly Challenge. I have learned much from them.
It encourages us to move upwards faster!
Very cool Mohammad!
Thank you Mohammad. Great work!
Thank you, Mohammad! Great thing!
Thank you
Nice work, Mohammad. Many thanks.
Thanks!
Mohammad Anwar: Thank you everyone
WEBVTT
1 00:00:00.000 --> 00:00:02.600 Mohammad Anwar: Hi everyone, this is Mohammad. Being recorded.
2 00:00:03.030 --> 00:00:18.229 Gabor Szabo: Okay, so hi everyone. My name is Gabor Szabo. Welcome to the Code Maven channel, if you're watching on YouTube, and to the Perl Maven subsection of it, if you're watching live.
3 00:00:18.380 --> 00:00:30.690 Gabor Szabo: Thank you for joining. It's absolutely great to have so many people interested in this topic, and thank you, Mohammad, for agreeing to giving this presentation.
4 00:00:30.690 --> 00:00:41.350 Gabor Szabo: As I said also earlier, the advantage of being here is that you can ask questions in the chat, and we had a nice
5 00:00:41.350 --> 00:00:53.630 Gabor Szabo: mutual introduction section before, and after the video, we stop the video recording, people can stay around, so next time, those people who are watching the video now, please join the…
6 00:00:53.630 --> 00:01:03.060 Gabor Szabo: the next event… the upcoming events. You can find below the video, you will find a link to the upcoming events, and also for notes
7 00:01:03.060 --> 00:01:13.760 Gabor Szabo: about this event, so check that out. With that said, I think I should welcome Mohammad again, and give you the
8 00:01:13.760 --> 00:01:15.530 Gabor Szabo: stage.
9 00:01:17.030 --> 00:01:20.620 Mohammad Anwar: Thank you, Gabor. Thank you for the opportunity, and…
10 00:01:21.910 --> 00:01:25.369 Mohammad Anwar: Do I need to share my screen first?
11 00:01:29.020 --> 00:01:33.609 Gabor Szabo: You can share the screen, you can introduce yourself as, in any order you like.
12 00:01:34.790 --> 00:01:35.810 Mohammad Anwar: Hi, good.
13 00:01:44.200 --> 00:01:51.699 Gabor Szabo: So while Mohammad is looking for the share, it's usually at the bottom, it's a… But,
14 00:01:51.700 --> 00:01:53.060 Mohammad Anwar: Yeah, I see ya.
15 00:01:53.060 --> 00:01:53.460 Gabor Szabo: Yeah.
16 00:01:53.540 --> 00:01:55.000 Mohammad Anwar: So if you have a…
17 00:01:55.000 --> 00:02:04.940 Gabor Szabo: all kinds of other events, and that's what I mentioned, both in Perl and in other languages, about other languages, so you can find all those sessions.
18 00:02:10.749 --> 00:02:11.299 Mohammad Anwar: Into…
19 00:02:18.210 --> 00:02:21.779 Gabor Szabo: Okay, I can see you now, I can see myself now in the screen.
20 00:02:22.230 --> 00:02:24.530 Mohammad Anwar: So, let me get this.
21 00:02:24.680 --> 00:02:25.800 Gabor Szabo: Yeah, okay.
22 00:02:26.030 --> 00:02:28.549 Mohammad Anwar: Alright, so, let's start this.
23 00:02:30.270 --> 00:02:31.050 Mohammad Anwar: But…
24 00:02:31.670 --> 00:02:38.339 Mohammad Anwar: Thing is, I'm not able to see anything, anybody, but it's alright. You guys can see my screen, right?
25 00:02:38.680 --> 00:02:42.110 Gabor Szabo: We can see your screen, what we'll cover, and…
26 00:02:42.430 --> 00:02:44.660 Gabor Szabo: If you really want, we can see you as well.
27 00:02:44.660 --> 00:02:45.540 Mohammad Anwar: Okay.
28 00:02:45.810 --> 00:02:47.879 Mohammad Anwar: So, yeah, thank you, everybody.
29 00:02:48.040 --> 00:02:57.430 Mohammad Anwar: for… Joining this session, and… Just to give a… the… the background, how and…
30 00:02:57.620 --> 00:03:01.630 Mohammad Anwar: how I started into this PHIE Forest API.
31 00:03:02.150 --> 00:03:02.939 Mohammad Anwar: And, I don't know.
32 00:03:02.940 --> 00:03:09.679 Gabor Szabo: Sorry, Mohammad, there is a note at the top of the screen. You are sharing your entire screen.
33 00:03:10.210 --> 00:03:10.830 Gabor Szabo: Okay.
34 00:03:10.830 --> 00:03:11.360 Mohammad Anwar: Yay.
35 00:03:11.360 --> 00:03:12.550 Gabor Szabo: Can you move that?
36 00:03:12.880 --> 00:03:17.709 Gabor Szabo: Maybe you can click on the minus sign and it will hopefully disappear.
37 00:03:25.120 --> 00:03:26.050 Gabor Szabo: Can you see it?
38 00:03:27.240 --> 00:03:29.650 Mohammad Anwar: I don't see a money sign anywhere.
39 00:03:30.060 --> 00:03:39.590 Gabor Szabo: Okay, well, I'll… it's not a problem right now, so go ahead, and then I'll tell you if it hides something on the screen, okay?
40 00:03:39.740 --> 00:03:40.989 Mohammad Anwar: Okay, fair enough.
41 00:03:42.420 --> 00:03:49.290 Mohammad Anwar: So, the whole idea for this… web framework was. Before…
42 00:03:50.320 --> 00:03:59.690 Mohammad Anwar: this, I was mostly into Donset 2, so whenever I had to build a web framework, I would just go… go to Donset 2, and my…
43 00:03:59.840 --> 00:04:12.540 Mohammad Anwar: job is done. It's… it's… it's quite easy to get… get a site up and running in no time, so… so when I… when I started working on, I believe, a couple of months, a few months ago, on
44 00:04:12.850 --> 00:04:15.499 Mohammad Anwar: DBIX class async.
45 00:04:15.660 --> 00:04:18.500 Mohammad Anwar: And I got into this whole async business.
46 00:04:19.550 --> 00:04:28.600 Mohammad Anwar: And I… every time I looked into my web application, I thought, what if I can turn this into a synchronous web framework?
47 00:04:29.420 --> 00:04:41.370 Mohammad Anwar: And I've been thinking about doing this, and then when somebody introduced me about the Python Fast API, I thought, wow, this is what I should be working on next, after my…
48 00:04:42.210 --> 00:04:50.680 Mohammad Anwar: DBIC async, project. So, even though I'm not, a Python developer, I…
49 00:04:51.190 --> 00:04:59.590 Mohammad Anwar: I know a little bit of Python, I can read Python, I can… but I'm not an expert in Python, but I still want to do
50 00:05:00.050 --> 00:05:08.699 Mohammad Anwar: understand what Fast API is doing, and how I can build in, in my Perl site, port it into Perl.
51 00:05:08.880 --> 00:05:09.830 Mohammad Anwar: So…
52 00:05:09.940 --> 00:05:21.680 Mohammad Anwar: Before that, I was… I had a little bit, like, introduction of PAGI. I'm sure you guys have known what is a synchronous Gateway Interface.
53 00:05:22.330 --> 00:05:29.349 Mohammad Anwar: And the guy who created this specification page is specification, John Napierogosi.
54 00:05:30.420 --> 00:05:38.690 Mohammad Anwar: I had a quick chat with him, and he kind of introduced me. He kind of guided me about the whole.
55 00:05:38.840 --> 00:05:47.380 Mohammad Anwar: specification, and how I can use that as a… as a foundation for my, this fast API port.
56 00:05:47.830 --> 00:05:53.140 Mohammad Anwar: two points, so… so the whole… web framework is…
57 00:05:53.370 --> 00:06:05.300 Mohammad Anwar: is based on… is a foundation on paging. So everything is… be, like, an asynchronous form using paging specifications, so… so that's where it all started, and…
58 00:06:06.510 --> 00:06:13.530 Mohammad Anwar: Even though it… from the feature point of view, I think I have covered almost everything that
59 00:06:14.000 --> 00:06:27.039 Mohammad Anwar: a Python Fast API has, but may not be complete. So, I must have just touched the surface, but not implemented everything that you find in Python FastAPI. So, probably you… if you know
60 00:06:27.110 --> 00:06:34.600 Mohammad Anwar: Python faster, you can probably tell me, okay, what bit is missing, and I probably… and maybe I next… next time, I'll try to…
61 00:06:34.930 --> 00:06:36.509 Mohammad Anwar: Fill the gap, gap.
62 00:06:36.790 --> 00:06:40.549 Mohammad Anwar: So, in this presentation, probably, I'm gonna go through
63 00:06:40.990 --> 00:06:48.630 Mohammad Anwar: this four-part session. First is going to be the foundation, where I'm gonna go through from the…
64 00:06:49.020 --> 00:06:54.580 Mohammad Anwar: Beginning from 0 to… Where we have now, and then we're gonna meet
65 00:06:54.770 --> 00:07:00.630 Mohammad Anwar: with my web framework, where I'm going to show you the basic,
66 00:07:00.950 --> 00:07:04.709 Mohammad Anwar: Routing and everything, and all the dependency injections, and
67 00:07:05.060 --> 00:07:10.190 Mohammad Anwar: And all other web frameworks, common web framework features, and all things.
68 00:07:11.340 --> 00:07:17.469 Mohammad Anwar: And one thing that really… got me into this. It was this security,
69 00:07:17.650 --> 00:07:28.190 Mohammad Anwar: features, security schemes that I had to build because FastAPI has those kind of schemes. So those… those are the interesting things that I'm going to show… share with you.
70 00:07:28.860 --> 00:07:34.810 Mohammad Anwar: And, yeah. So, let's start with the first… So…
71 00:07:37.410 --> 00:07:46.270 Mohammad Anwar: So, basically, so we start with the framework. I'm sure you all know what The framework is… is… Basically.
72 00:07:48.080 --> 00:07:50.889 Mohammad Anwar: You, you get a brother send a request.
73 00:07:51.940 --> 00:07:56.629 Mohammad Anwar: And then somebody accepts those requests and do something, and then you get a result back.
74 00:07:56.790 --> 00:08:00.750 Mohammad Anwar: So this… something in between is your web framework.
75 00:08:01.180 --> 00:08:05.720 Mohammad Anwar: So, this particular web framework, where…
76 00:08:06.380 --> 00:08:12.110 Mohammad Anwar: We are gonna… we… we're gonna deal… work with it. So, basically.
77 00:08:18.020 --> 00:08:18.880 Mohammad Anwar: Bear with me.
78 00:08:23.900 --> 00:08:29.159 Mohammad Anwar: So this whole asynchronous business is where you don't wait for any
79 00:08:30.730 --> 00:08:33.510 Mohammad Anwar: one, request to process. You can…
80 00:08:33.659 --> 00:08:41.679 Mohammad Anwar: fire off a request, and then you can move on to your next task without waiting for it to finish it. So, that's how the whole
81 00:08:43.250 --> 00:08:58.329 Mohammad Anwar: asynchronous web framework is based on. So, this is where the Pagy fast API is going to help us, where you have multiple requests coming through and not waiting for it to finish, and then you move on to your next, actions.
82 00:08:58.520 --> 00:09:00.660 Mohammad Anwar: That's where it's gonna work out.
83 00:09:03.180 --> 00:09:10.219 Mohammad Anwar: So… so… so… so what is Pager? It's this, like, per asynchronous gateway interface, which is… which is…
84 00:09:10.320 --> 00:09:15.880 Mohammad Anwar: Which is like a Act like a socket, where Anybody…
85 00:09:16.590 --> 00:09:19.819 Mohammad Anwar: Speaking, application can talk.
86 00:09:20.250 --> 00:09:26.750 Mohammad Anwar: You can plug into this socket where you can get your applications running.
87 00:09:28.120 --> 00:09:35.530 Mohammad Anwar: And also, you don't actually… create a page directly, and you… framework, like.
88 00:09:35.630 --> 00:09:41.569 Mohammad Anwar: the one I created, the PG files, API can… Help you… Talk to Beijing.
89 00:09:46.580 --> 00:09:50.679 Mohammad Anwar: So… These are the layers. So, first is your…
90 00:09:51.280 --> 00:09:58.550 Mohammad Anwar: routes and business logic, where your application, you create your applications. And then, FastAPI, PG FastAP, where we help you
91 00:09:58.710 --> 00:10:04.140 Mohammad Anwar: Create a routing, and all the type validations, dependency, injections.
92 00:10:04.520 --> 00:10:09.389 Mohammad Anwar: And also, you get, automated documentation, which I'm going to show you.
93 00:10:09.660 --> 00:10:10.610 Mohammad Anwar: Later.
94 00:10:12.410 --> 00:10:20.510 Mohammad Anwar: And the pay… the… the… the whole, Peggy First API are views, There's a…
95 00:10:21.200 --> 00:10:24.320 Mohammad Anwar: there's a Pagy server that comes with Pagy,
96 00:10:24.570 --> 00:10:34.180 Mohammad Anwar: tools, which I've used it, to run my page-y fast API applications, so… That's where I'm gonna see.
97 00:10:37.070 --> 00:10:47.180 Mohammad Anwar: So, this is what… this is how you can just create your Hello World kind of application, web application, if you want to start with the PG Fast API. So, just install it, and then…
98 00:10:47.490 --> 00:10:49.570 Mohammad Anwar: Create an op… create an,
99 00:10:49.960 --> 00:10:52.730 Mohammad Anwar: fast API applications, which is giving
100 00:10:53.490 --> 00:10:59.210 Mohammad Anwar: And start giving a route, and then have a handler where it's a synchronous subroutine.
101 00:10:59.660 --> 00:11:06.200 Mohammad Anwar: Which has a context, you get a context, and then you work… You worked with it.
102 00:11:06.840 --> 00:11:11.320 Mohammad Anwar: context, and then display it. So this is where you get the hello world message.
103 00:11:11.780 --> 00:11:14.680 Mohammad Anwar: And then, once you have this application.
104 00:11:14.910 --> 00:11:21.090 Mohammad Anwar: Run it as a PG server. By default, it listens to 5,000 port.
105 00:11:21.310 --> 00:11:26.060 Mohammad Anwar: And then, this is how you… you access your route.
106 00:11:26.920 --> 00:11:28.150 Mohammad Anwar: Underlooker has.
107 00:11:33.300 --> 00:11:38.510 Mohammad Anwar: Also, when you created a route, You… you can access the…
108 00:11:39.460 --> 00:11:42.990 Mohammad Anwar: The, the parameters, routing parameters.
109 00:11:43.250 --> 00:12:01.399 Mohammad Anwar: Just like this. And then, for example, here you're creating a route where you access a particular specific item, where you have an ID as a unique item ID, and that get access… you can access it in a context. This $C is the page E context.
110 00:12:01.890 --> 00:12:10.159 Mohammad Anwar: excuse me, page context, and then you can figure out what the ID is as a… that you received as a routing parameter.
111 00:12:10.290 --> 00:12:12.850 Mohammad Anwar: So, currently, you can create
112 00:12:13.200 --> 00:12:20.750 Mohammad Anwar: Get, post, boot, patch, and delete, and all these, actions that you can create in your applications.
113 00:12:21.550 --> 00:12:26.269 Mohammad Anwar: And they all are async by default, so it's non-blocking.
114 00:12:32.510 --> 00:12:38.900 Mohammad Anwar: The best thing about it is you get automatic validations, which is…
115 00:12:39.000 --> 00:12:47.269 Mohammad Anwar: built in, so you don't need to do any kind of validations manually, so just… just say, okay, so when you, when you…
116 00:12:47.610 --> 00:12:52.970 Mohammad Anwar: For example, in this example, I'm just saying, I'm posting data.
117 00:12:53.080 --> 00:13:00.600 Mohammad Anwar: something in these actions, and you… you can specify your key, and then your data type.
118 00:13:01.020 --> 00:13:03.660 Mohammad Anwar: For this, we are using type dining.
119 00:13:03.880 --> 00:13:11.780 Mohammad Anwar: For all the… The type validation is done by the type dining, so that's where you get the
120 00:13:12.350 --> 00:13:16.979 Mohammad Anwar: All the type dining, validations you get by default.
121 00:13:20.840 --> 00:13:25.330 Mohammad Anwar: Next is the dependency injection, which is, I think, one of the
122 00:13:26.680 --> 00:13:34.740 Mohammad Anwar: core feature of FastAPI. This was something new for me. I was… I never heard of this before.
123 00:13:34.850 --> 00:13:39.960 Mohammad Anwar: Which I find it very handy in case of, like, for example, when you
124 00:13:41.130 --> 00:13:47.940 Mohammad Anwar: When you have, like, a database connection that you want to inject, and every…
125 00:13:49.630 --> 00:13:53.420 Mohammad Anwar: And then that get injected, and then you can use it instead of…
126 00:13:54.890 --> 00:14:02.299 Mohammad Anwar: Doing, as global, so… so you just declare it once, and then you can inject in every method that you want.
127 00:14:02.650 --> 00:14:08.809 Mohammad Anwar: that object, to be available. So, for example, in… in an application where you…
128 00:14:08.830 --> 00:14:23.570 Mohammad Anwar: you will interact with database every time, so you can just inject that database handle, and then inside the handler, you can access that object, and then start… you can interact with the database. So this is quite handy if you have any kind of
129 00:14:23.950 --> 00:14:27.820 Mohammad Anwar: Code that you want to inject into any Rude.
130 00:14:31.640 --> 00:14:37.670 Mohammad Anwar: And also, You, you get the default, support for the middleware and the cores.
131 00:14:38.460 --> 00:14:42.290 Mohammad Anwar: So, for… if you want to add any middleware you have, you can just…
132 00:14:42.750 --> 00:14:46.029 Mohammad Anwar: Call this add middleware method, and then pass on your
133 00:14:46.150 --> 00:14:50.290 Mohammad Anwar: Your subroutine, and then you can work on
134 00:14:50.530 --> 00:14:57.350 Mohammad Anwar: this add middleware features. Also, similar way, you can add course as well, if you want to have
135 00:14:57.830 --> 00:15:05.369 Mohammad Anwar: anything, just call add course, and then you can pass whatever parameters you need to pass on. So this is how you can add the course.
136 00:15:06.760 --> 00:15:18.190 Mohammad Anwar: I'm just going through the basic thing. If you want a fully functional application, if you go to the CPAN and go to the Peggy First API, there's a… there's a whole bunch of,
137 00:15:19.220 --> 00:15:33.689 Mohammad Anwar: fully functional applications, where I'm going… I've gone through each of these features in detail, so you will have proper… for working core application, where you can see how it actually works in a toy application.
138 00:15:36.580 --> 00:15:38.720 Mohammad Anwar: Next is the rate limiting.
139 00:15:39.030 --> 00:15:43.250 Mohammad Anwar: So, the… the… This kind of thing, I…
140 00:15:43.400 --> 00:15:46.780 Mohammad Anwar: I really liked it, because I remember when
141 00:15:47.530 --> 00:15:54.509 Mohammad Anwar: I was building my personal website where I had to put some rate-limiting things, so…
142 00:15:54.620 --> 00:16:01.010 Mohammad Anwar: I had to do everything by hand. So this… this… this page… page… first API.
143 00:16:01.150 --> 00:16:06.500 Mohammad Anwar: help me not to create a boilerplate code, and then I just have everything
144 00:16:07.390 --> 00:16:16.159 Mohammad Anwar: handy, so you don't need to do anything manually. So just add limit rate, and then you can say… you can add limit rate.
145 00:16:16.320 --> 00:16:17.590 Mohammad Anwar: as, as an,
146 00:16:17.920 --> 00:16:23.129 Mohammad Anwar: Per route, or you can… you can do as an overall as well… as well.
147 00:16:23.300 --> 00:16:30.620 Mohammad Anwar: By default, the limiting is happening in memory, but you can create, other,
148 00:16:30.880 --> 00:16:44.919 Mohammad Anwar: schema as a driver as well. So there are two separate, distributions I've created, one in CHI and one in Redis, if you want… if you want, like, an extended driver for rate limited.
149 00:16:48.260 --> 00:16:49.730 Mohammad Anwar: Next is this.
150 00:16:49.830 --> 00:16:54.680 Mohammad Anwar: CSRRI protection, which is also built in. By default,
151 00:16:54.870 --> 00:16:57.219 Mohammad Anwar: It infosed, like, as a header.
152 00:16:57.930 --> 00:16:58.640 Mohammad Anwar: And…
153 00:16:58.870 --> 00:17:09.579 Mohammad Anwar: Now, also, it's like a double submit cookie, where it… it set the, header, and also set the token, token as well.
154 00:17:11.319 --> 00:17:17.989 Mohammad Anwar: And this is… that's… you just call enable CSRF, and you assign the secret, whatever secret it is.
155 00:17:21.060 --> 00:17:31.759 Mohammad Anwar: This one was… I think it's not part of the FOST API, but I added it because I thought it's quite handy if you're building a web framework and
156 00:17:32.170 --> 00:17:34.149 Mohammad Anwar: To have this boat protection.
157 00:17:34.450 --> 00:17:37.300 Mohammad Anwar: is… is not… Like, a complete,
158 00:17:37.760 --> 00:17:53.640 Mohammad Anwar: implementation. It's just a basic one for now. Probably, I'm going to extend it, as I go. So, you have a difficulty level, and you can assign a boat, environmental variable as a secret, and that is used,
159 00:17:53.860 --> 00:17:54.910 Mohammad Anwar: Every time.
160 00:17:55.160 --> 00:17:56.889 Mohammad Anwar: Somebody tried to attack.
161 00:18:00.190 --> 00:18:04.429 Mohammad Anwar: This is… next is the… the applications,
162 00:18:04.790 --> 00:18:07.469 Mohammad Anwar: Lifespan, where you can just have a…
163 00:18:07.740 --> 00:18:11.930 Mohammad Anwar: on startup and on shutdown. This is quite handy if you…
164 00:18:12.140 --> 00:18:28.930 Mohammad Anwar: If you have, like, a… if you have, database interaction, so mostly, like, on startup, you can just set up your database instance, and on shutdown, you can probably, clean up your database handle once everything is… is done, so you have a nice…
165 00:18:29.470 --> 00:18:36.829 Mohammad Anwar: like, entry point on startup and shutdown. So you can use this, on startup and on shutdown method.
166 00:18:36.970 --> 00:18:39.120 Mohammad Anwar: To do this kind of operation.
167 00:18:42.150 --> 00:18:47.720 Mohammad Anwar: Next is the WebSocket. I have been playing with the WebSocket.
168 00:18:48.110 --> 00:18:58.519 Mohammad Anwar: in the recent past. So, when I was doing this, I thought, why not implement a WebSocket as well on top of this PG FAST API? So, this is where
169 00:18:58.820 --> 00:19:06.020 Mohammad Anwar: Basically, I'm… I'm using, the, there's a Pagy WebSocket, distribution already.
170 00:19:06.360 --> 00:19:16.020 Mohammad Anwar: available from Pagey tools, from the PG specification, so nothing is done here. Everything is delegated to that PG web socket.
171 00:19:16.200 --> 00:19:19.719 Mohammad Anwar: And that's where everything is happening, so you just…
172 00:19:19.830 --> 00:19:25.929 Mohammad Anwar: create a web… call a WebSocket method, and just pass in the handler, and that will do.
173 00:19:26.260 --> 00:19:28.779 Mohammad Anwar: the WebSocket functionality for you.
174 00:19:31.990 --> 00:19:34.860 Mohammad Anwar: Next is SSE, again.
175 00:19:35.310 --> 00:19:40.150 Mohammad Anwar: This is, again, delegated to the PG SSI, which… from Pagey Tools.
176 00:19:40.690 --> 00:19:41.849 Mohammad Anwar: Not from the…
177 00:19:42.150 --> 00:19:48.910 Mohammad Anwar: PG Fast API, but this is quite handy, and you get, by default, if you… if you have
178 00:19:49.130 --> 00:19:59.359 Mohammad Anwar: if you want a SSE functionality in AGFAST API, you just create a method, and then root, and then you provide a handler where you can
179 00:19:59.460 --> 00:20:03.559 Mohammad Anwar: do all kind of SSE-related operations inside this handler.
180 00:20:03.740 --> 00:20:06.499 Mohammad Anwar: As an asynchronous, mode.
181 00:20:09.910 --> 00:20:27.520 Mohammad Anwar: this is something, I… was not 100% sure, but then, after talking to John, the creator of Pengie, and I thought, okay, basically, I did… I don't want to keep, like, a…
182 00:20:27.660 --> 00:20:28.610 Mohammad Anwar: Later, yes.
183 00:20:29.480 --> 00:20:33.680 Mohammad Anwar: Basic… I didn't want to have, like, a proper…
184 00:20:34.280 --> 00:20:43.400 Mohammad Anwar: whether to use a feature I.O. or iOSync. So, eventually, we decided that it's better to keep a feature I.O.
185 00:20:43.720 --> 00:20:45.369 Mohammad Anwar: As, as my,
186 00:20:45.670 --> 00:20:56.860 Mohammad Anwar: all the IO sync thingy. So it's… so for all the event loops, everything is dependent on feature I.O. as a baseline.
187 00:20:59.330 --> 00:21:07.900 Mohammad Anwar: are also… with, first, PG Fast API, you get the… by… by default, you get the…
188 00:21:09.100 --> 00:21:13.159 Mohammad Anwar: the documentation, so I get documentation for free.
189 00:21:13.470 --> 00:21:19.820 Mohammad Anwar: And… just get a slash docs and slash open API JSON you get by default.
190 00:21:20.370 --> 00:21:26.469 Mohammad Anwar: So it's quite handy if you have… if you… you don't need to build the Sawyer interface by hand, you just get
191 00:21:26.850 --> 00:21:27.969 Mohammad Anwar: by default.
192 00:21:31.800 --> 00:21:36.330 Mohammad Anwar: So… Again, as a recap, I'm going to say…
193 00:21:37.650 --> 00:21:44.389 Mohammad Anwar: Why picking FastAPI? Because it's async and it's non-blocking, which is the main features.
194 00:21:44.900 --> 00:21:49.740 Mohammad Anwar: You get a database injection, dependency injection, as a second feature.
195 00:21:50.110 --> 00:21:53.850 Mohammad Anwar: Third is this… is… is it type safe. You can… you can…
196 00:21:54.050 --> 00:21:56.699 Mohammad Anwar: You, you get a default,
197 00:21:56.870 --> 00:21:59.940 Mohammad Anwar: type checks using the TypeTiny module.
198 00:22:00.060 --> 00:22:02.830 Mohammad Anwar: And you get automated documentation.
199 00:22:06.280 --> 00:22:09.390 Mohammad Anwar: So one thing that was missing was this.
200 00:22:09.890 --> 00:22:11.250 Mohammad Anwar: security thing.
201 00:22:11.910 --> 00:22:21.050 Mohammad Anwar: So, so far, we never… we haven't touched the… The security pathway, how to…
202 00:22:21.200 --> 00:22:26.619 Mohammad Anwar: to process the session and everything. So, I really wanted to build in
203 00:22:27.420 --> 00:22:35.899 Mohammad Anwar: the authorizations. For this, I created a separate distribution called PG Fast API Security, which is
204 00:22:37.370 --> 00:22:48.440 Mohammad Anwar: separate distribution outside of PG FastAPI that handles all four common schemes that is in the Python Fast API.
205 00:22:49.290 --> 00:22:57.150 Mohammad Anwar: these are the four… the four schemes that for HTTP bearer, HTTP basic API key, and odd.
206 00:22:57.900 --> 00:22:59.980 Mohammad Anwar: And… These are…
207 00:23:00.590 --> 00:23:07.590 Mohammad Anwar: like, implemented as a separate distribution page for the API security. You can… you get all those
208 00:23:08.000 --> 00:23:11.199 Mohammad Anwar: Four schemes, depending on how you want to use it.
209 00:23:11.660 --> 00:23:18.060 Mohammad Anwar: One thing is there is the… and all… this PG8 Fast API Security, we… we actually
210 00:23:18.540 --> 00:23:28.109 Mohammad Anwar: don't do any verification. It's just… we do this, just extract. We just, find out what is in there, and we just…
211 00:23:30.120 --> 00:23:36.609 Mohammad Anwar: we just fetch the security details and doesn't do any checks. Checking is done by
212 00:23:36.950 --> 00:23:40.030 Mohammad Anwar: The applications on top of it.
213 00:23:41.710 --> 00:23:43.230 Mohammad Anwar: For example, here.
214 00:23:43.370 --> 00:23:43.840 Mohammad Anwar: And then…
215 00:23:43.840 --> 00:23:49.379 Gabor Szabo: Sorry. No, but actually, go on, I'll ask you the questions after.
216 00:23:51.030 --> 00:23:54.390 Mohammad Anwar: Okay, so for example, here in this,
217 00:23:54.750 --> 00:23:58.140 Mohammad Anwar: We're creating a STT bearer scheme.
218 00:23:58.600 --> 00:24:05.059 Mohammad Anwar: as there, and then we inject that, as the token gets injected as dependencies.
219 00:24:05.400 --> 00:24:06.090 Mohammad Anwar: And…
220 00:24:06.410 --> 00:24:20.119 Mohammad Anwar: Here, if you see, we're calling the verify JWT, which is Java token verification, which is outside of this… this framework. So you… this scheme doesn't
221 00:24:20.420 --> 00:24:39.389 Mohammad Anwar: give you this default, you have to create your own verification logic, and… and once you're done, and then you just… if… if it… if there is any issue, you just, you don't die, you actually set the status, and then return the details. That's how you… you handle the…
222 00:24:39.520 --> 00:24:45.460 Mohammad Anwar: any… Error, or any… any issue with the verifications. If anything.
223 00:24:46.330 --> 00:24:48.429 Mohammad Anwar: Anything, needs to be handled.
224 00:24:52.050 --> 00:24:55.499 Gabor Szabo: Okay, maybe now is the time to ask the questions, right?
225 00:24:55.670 --> 00:24:58.319 Gabor Szabo: Because you're in between two topics.
226 00:24:58.430 --> 00:25:06.179 Gabor Szabo: The first question was, is PUGI, I don't know, PAGI? Fast PAGI?
227 00:25:06.350 --> 00:25:09.149 Gabor Szabo: Fast API reverse proxy Aware.
228 00:25:11.220 --> 00:25:12.800 Mohammad Anwar: Right now, no.
229 00:25:14.680 --> 00:25:23.250 Gabor Szabo: So does it mean that you have to put it in front of the… so that that's the front first thing on the internet? So you can't put a reverse proxy in front of it?
230 00:25:24.480 --> 00:25:25.110 Gabor Szabo: Okay.
231 00:25:25.110 --> 00:25:26.589 Mohammad Anwar: At this point, no.
232 00:25:28.700 --> 00:25:37.100 Gabor Szabo: Okay, and then it continues, like, PHEI talking to… talking HTTP to a HA proxy.
233 00:25:37.330 --> 00:25:41.309 Gabor Szabo: And then HAProxy talks to clients over HTTPS.
234 00:25:42.130 --> 00:25:42.720 Mohammad Anwar: Yeah.
235 00:25:43.270 --> 00:25:44.660 Gabor Szabo: If that's possible?
236 00:25:45.930 --> 00:25:50.140 Mohammad Anwar: I've not tried it, maybe I'll give it a try, see if it's possible.
237 00:25:50.520 --> 00:25:51.789 Mohammad Anwar: I think it should be.
238 00:25:53.090 --> 00:25:58.979 Gabor Szabo: Okay. The other question is, how do I customize the automated docs?
239 00:25:59.380 --> 00:26:04.370 Gabor Szabo: E.g, I want to add a description or request example.
240 00:26:05.920 --> 00:26:13.899 Mohammad Anwar: You, you can. I'm going to show you later, where I have created another application where
241 00:26:14.430 --> 00:26:26.560 Mohammad Anwar: I'm going to show you how I've described all the description of the doc where you can see everything, how you can manage, set up everything in an application. I'm going to show you.
242 00:26:26.750 --> 00:26:27.500 Gabor Szabo: Okay.
243 00:26:28.800 --> 00:26:35.569 Mohammad Anwar: So… later, after this, security schemes, I even…
244 00:26:36.080 --> 00:26:38.409 Mohammad Anwar: I added these to type bot.
245 00:26:38.960 --> 00:26:43.639 Mohammad Anwar: and then response model, and all those features. So…
246 00:26:44.390 --> 00:26:51.309 Mohammad Anwar: with this type path, this… either this pagey fast API type path, where you can check the,
247 00:26:51.780 --> 00:27:00.850 Mohammad Anwar: the data type, as well, of the, of the, the root, Root, pathroot.
248 00:27:00.960 --> 00:27:06.700 Mohammad Anwar: So, for example, here I'm checking whether the item ID is integer,
249 00:27:07.410 --> 00:27:14.099 Mohammad Anwar: So this kind of validation can be done as a part of dependency. You can check all those… the key.
250 00:27:14.370 --> 00:27:27.059 Mohammad Anwar: And with the response model, with this, another distribution, which is PG Fast API response model, with this method, with response model, we can add… we can… we can add and make it as a handler, and then
251 00:27:27.390 --> 00:27:33.179 Mohammad Anwar: that further checks can be done, like, for example, ID should be in an integer, name should be in a string.
252 00:27:33.810 --> 00:27:41.220 Mohammad Anwar: So, that can be done as well, with these two handy path and response model distribution package.
253 00:27:45.140 --> 00:27:53.470 Mohammad Anwar: So… The full picture is, basically, you create your application where you define your rules and business logic.
254 00:27:54.010 --> 00:27:58.970 Mohammad Anwar: And then Fast API… page… PG-fast API security.
255 00:27:59.140 --> 00:28:03.209 Mohammad Anwar: Help you with, with the defense and,
256 00:28:03.350 --> 00:28:09.420 Mohammad Anwar: And you can check the… extract the auth key, auth token, everything.
257 00:28:09.530 --> 00:28:18.030 Mohammad Anwar: And then, first API, FastAPI, PG Fast API can help you doing the routing and all validations and injections.
258 00:28:18.370 --> 00:28:20.959 Mohammad Anwar: And finally, with a PG server.
259 00:28:21.410 --> 00:28:26.240 Mohammad Anwar: Your application can start… you can restart running your application there.
260 00:28:29.030 --> 00:28:30.840 Mohammad Anwar: Okay… Food.
261 00:28:31.730 --> 00:28:34.539 Mohammad Anwar: These are my common questions, okay.
262 00:28:35.700 --> 00:28:39.990 Mohammad Anwar: how does this compare? I mean, it's exactly the same thing,
263 00:28:40.260 --> 00:28:45.120 Mohammad Anwar: what I have found out in Python FastAPI. I might have missed something.
264 00:28:45.820 --> 00:28:51.910 Mohammad Anwar: So if you find anything missing, probably you can tell me, and then I can… Fill those gaps.
265 00:28:53.260 --> 00:29:00.130 Mohammad Anwar: And… as I say, maybe you don't need to learn iOS or feature async deeply, so just
266 00:29:01.960 --> 00:29:08.749 Mohammad Anwar: Peggy Sabo owns all the event loops, so everything is done, so you don't need to be worrying anything.
267 00:29:09.870 --> 00:29:12.310 Mohammad Anwar: And… Authentication built in.
268 00:29:12.700 --> 00:29:16.200 Mohammad Anwar: Not by design, but you can create a schema.
269 00:29:16.660 --> 00:29:20.120 Mohammad Anwar: And then use a middleware, and depends.
270 00:29:20.610 --> 00:29:21.950 Mohammad Anwar: For security ads.
271 00:29:26.240 --> 00:29:36.500 Mohammad Anwar: for Perl version, I… the whole, the whole framework are used The latest world-class field… world-class…
272 00:29:37.120 --> 00:29:39.420 Mohammad Anwar: New per class, so, method.
273 00:29:40.280 --> 00:29:49.000 Mohammad Anwar: Feature, experimental feature, or… And for that, I see… the minimum is 538 is what you need, and then…
274 00:29:49.220 --> 00:29:54.289 Mohammad Anwar: That's the minimum is… you can… you have to have to run this PGA.
275 00:29:54.520 --> 00:29:55.710 Mohammad Anwar: Bonsai APA.
276 00:29:57.680 --> 00:30:03.380 Mohammad Anwar: And also for… For rate limit, by default,
277 00:30:03.910 --> 00:30:13.609 Mohammad Anwar: By default, you get an in-memory rate limit, but you can have a ready source CHI as well, if you want to have that backend for rate limit.
278 00:30:15.830 --> 00:30:21.800 Mohammad Anwar: You can, of course, you can ask any bug… you can report your bug to the GitHub repository.
279 00:30:22.020 --> 00:30:29.730 Mohammad Anwar: Which is a pagey-fast API issues, where you can… you can report any issues or any requests you have, yeah.
280 00:30:31.710 --> 00:30:32.679 Mohammad Anwar: the… the name?
281 00:30:32.680 --> 00:30:34.060 Gabor Szabo: Another question.
282 00:30:34.250 --> 00:30:46.500 Gabor Szabo: Sorry, another question. What about nested data validation? A flow in using TypeTiny for schema validation is that there isn't a way to model presence.
283 00:30:47.810 --> 00:30:54.319 Gabor Szabo: As far… if I… as far as I know. I could be wrong, though. That's the com… that's the question.
284 00:30:55.780 --> 00:30:58.190 Mohammad Anwar: So you're saying… sorry, I didn't get the question.
285 00:30:59.050 --> 00:31:03.230 Gabor Szabo: Yeah, so the question is, is there nested data validation?
286 00:31:04.400 --> 00:31:06.910 Mohammad Anwar: No, no, not at the moment, not currently.
287 00:31:07.320 --> 00:31:08.100 Gabor Szabo: Okay.
288 00:31:08.360 --> 00:31:11.490 Mohammad Anwar: So it's just… just key value, key value.
289 00:31:13.040 --> 00:31:18.620 Mohammad Anwar: Not as an estate one right now, but yeah, maybe in future we can support that.
290 00:31:19.950 --> 00:31:26.509 Mohammad Anwar: So, I think the latest version is 1.73 is the latest on CPAN.
291 00:31:27.360 --> 00:31:32.740 Mohammad Anwar: And we… Yes.
292 00:31:34.090 --> 00:31:37.480 Mohammad Anwar: Does the type path replace query? No, it's parameter.
293 00:31:38.270 --> 00:31:41.110 Mohammad Anwar: So you're still using type R, type training.
294 00:31:41.930 --> 00:31:52.819 Mohammad Anwar: Exception Handler? Yes, we have Exception Handler, this package, for… For this… That's it.
295 00:31:55.140 --> 00:31:56.370 Mohammad Anwar: I'm sure.
296 00:31:58.190 --> 00:31:59.440 Mohammad Anwar: to desire them.
297 00:32:01.260 --> 00:32:08.500 Mohammad Anwar: my GitHub repository for Fast API… PG Fast API, and PG Fast API Security.
298 00:32:09.860 --> 00:32:13.110 Mohammad Anwar: And before I cut that, let me…
299 00:32:16.550 --> 00:32:18.810 Mohammad Anwar: Can… can I… can you see my screen?
300 00:32:22.280 --> 00:32:23.720 Mohammad Anwar: Can you see my screen?
301 00:32:23.720 --> 00:32:25.420 Gabor Szabo: Yes, we can see him at the CPU.
302 00:32:25.420 --> 00:32:30.100 Mohammad Anwar: So, this is my, C-pen, metal C-pen, where…
303 00:32:30.240 --> 00:32:32.540 Mohammad Anwar: first API. I'm going to show you
304 00:32:33.440 --> 00:32:36.819 Mohammad Anwar: In my presentation, I've only touched
305 00:32:38.010 --> 00:32:41.909 Mohammad Anwar: this, surface. So, if you want to go in details.
306 00:32:41.910 --> 00:32:53.690 Gabor Szabo: Wait a second, there is a very… another question here. Is the event loop an internal detail? Can the program hook to it to wait for other events, like file system?
307 00:32:59.830 --> 00:33:02.159 Mohammad Anwar: Sorry, I didn't… I didn't understand whatsoever's question.
308 00:33:02.160 --> 00:33:16.559 Gabor Szabo: Yeah, I'm not sure that I understand totally the question, but the question is, is the event loop internal… an internal detail? And then the continuation is, can the program hook to it to wait for other events?
309 00:33:16.840 --> 00:33:17.290 Mohammad Anwar: None.
310 00:33:17.290 --> 00:33:17.730 Gabor Szabo: by, you know.
311 00:33:17.960 --> 00:33:20.840 Mohammad Anwar: N-No, no, no, not at the moment.
312 00:33:21.120 --> 00:33:31.379 Gabor Szabo: No, I mean, okay, so that's strange to me. So if you have a… so it's only async on the website? If you go to the database, it's not a sync?
313 00:33:32.030 --> 00:33:35.059 Mohammad Anwar: It is… no, from the database side, yes, it is a sync, yeah.
314 00:33:35.310 --> 00:33:42.309 Gabor Szabo: And if you want… so also, if you have an async database access… sorry, file system access, that's also async, right?
315 00:33:43.420 --> 00:33:45.010 Mohammad Anwar: Yes, that's true, yeah.
316 00:33:45.010 --> 00:33:49.509 Gabor Szabo: Yeah, so, yeah, but you don't hook into the… into the event loop.
317 00:33:50.020 --> 00:33:50.750 Mohammad Anwar: No, you don.
318 00:33:50.750 --> 00:33:57.969 Gabor Szabo: you can have the… you can have async methods, so I'm not sure I understand the question totally.
319 00:33:58.760 --> 00:34:03.329 Gabor Szabo: But you can… can have… use other async methods, right?
320 00:34:03.840 --> 00:34:09.160 Mohammad Anwar: Yes. So, for example, in this application, you can find it on the…
321 00:34:09.280 --> 00:34:14.239 Mohammad Anwar: in the distribution, where I am… I'm showing,
322 00:34:15.370 --> 00:34:21.460 Mohammad Anwar: So, if… if you can see, I… have a DBIC async,
323 00:34:22.570 --> 00:34:30.899 Mohammad Anwar: handler, class, where I'm having a database connection to a SQLite, and running as an async, Divic.
324 00:34:31.480 --> 00:34:42.260 Mohammad Anwar: And then… I bought… one route which I'm posting data, and second is on Fitching a user ID.
325 00:34:44.310 --> 00:34:48.580 Mohammad Anwar: If I can… maybe I can run this application.
326 00:34:48.909 --> 00:34:50.059 Mohammad Anwar: Maybe not.
327 00:34:50.300 --> 00:34:55.679 Mohammad Anwar: So, so, for example, so these are the examples you can find, And the…
328 00:34:56.080 --> 00:35:00.030 Mohammad Anwar: in the MetaCPN, distribution, for all this.
329 00:35:00.980 --> 00:35:14.800 Mohammad Anwar: CSRF, if you want to look into the details how you can implement CSRF using PG Fast API, you can look into these examples, or if you're looking at the DBK Sync integration, or you can look into the
330 00:35:14.860 --> 00:35:21.229 Mohammad Anwar: the docs, how the docs get created for… that's what the Giver was asking. So, for example, if I…
331 00:35:21.910 --> 00:35:29.170 Mohammad Anwar: Open up here, so… this… this is quite, this is interesting, and I got quite a…
332 00:35:29.470 --> 00:35:45.790 Mohammad Anwar: nice, working example. So you can go into the details in these examples where you can find, exactly how you can implement. There's another example called where you have a rate limit, how you implement the rate limit using the pages.
333 00:35:46.340 --> 00:35:47.540 Mohammad Anwar: first API.
334 00:35:47.670 --> 00:35:53.200 Mohammad Anwar: Similarly, you have an example, complete application where you can implement the SSE.
335 00:35:54.120 --> 00:36:14.030 Mohammad Anwar: and all the webhook examples, WebSocket examples. So, quite a lot of working examples here, where you can explore how this fast API, PG Fast API, can be used to build, like, fully functional applications, where you have an asynchronous, operations.
336 00:36:14.350 --> 00:36:32.030 Mohammad Anwar: and integrate it with the database as well. If the database… database can be asynchronous as well, like what the Gabor was saying. So, you can… you can use… you can use, like, a regular database, or you can use an asynchronous, like, DB class async as well, with your web applications.
337 00:36:32.650 --> 00:36:34.430 Mohammad Anwar: That's why you can use it.
338 00:36:34.710 --> 00:36:38.579 Mohammad Anwar: And if… if you really want to… I've got this,
339 00:36:39.940 --> 00:36:43.149 Mohammad Anwar: my blog web, page, where I…
340 00:36:44.070 --> 00:36:57.510 Mohammad Anwar: gone through individual, features of FastAPI. For example, if you're interested to know how Webhook works with Pagey FastAPI, you can go through individual blog posts where I have webhook, MessageQ,
341 00:36:57.570 --> 00:37:08.879 Mohammad Anwar: API Gateway you can build with FastAPI, and then WebSocket, and also how to integrate your DBIX class async, with the Fast API, PG Fast API. So all…
342 00:37:09.290 --> 00:37:15.169 Mohammad Anwar: This… this blog post, can take you through the details, how you can
343 00:37:15.690 --> 00:37:22.719 Mohammad Anwar: and go through buildup from the scratch using the PG Fast API, these features.
344 00:37:25.120 --> 00:37:27.950 Mohammad Anwar: So, these are… these are the first API.
345 00:37:28.400 --> 00:37:32.530 Mohammad Anwar: And… you have a security where I have…
346 00:37:32.670 --> 00:37:36.590 Mohammad Anwar: these are the schemes currently. We've got API key.
347 00:37:36.820 --> 00:37:40.019 Mohammad Anwar: basics, barrier, and OAuth schemes.
348 00:37:40.920 --> 00:37:48.979 Mohammad Anwar: And again, you have working examples here where you can go through, because S… The examples are…
349 00:37:49.300 --> 00:38:01.890 Mohammad Anwar: It's a complete application, so you can go through how everything can be plugged together to give you a complete application using all these different schemes, security schemes you have.
350 00:38:03.720 --> 00:38:04.680 Mohammad Anwar: So, yeah.
351 00:38:04.880 --> 00:38:07.560 Mohammad Anwar: So that's… that's what I have so far.
352 00:38:07.850 --> 00:38:08.770 Mohammad Anwar: Thank you.
353 00:38:20.690 --> 00:38:23.400 Mohammad Anwar: So that's it for me. Any questions?
354 00:38:24.350 --> 00:38:26.050 Gabor Szabo: Then please stop sharing.
355 00:38:29.140 --> 00:38:30.010 Gabor Szabo: Okay.
356 00:38:30.430 --> 00:38:43.479 Gabor Szabo: If there are questions, please ask in the chat. There are some comments, so I can read them out in the meantime. So there was a comment that, yes, you can hook into the IO async loop.
357 00:38:43.560 --> 00:38:52.090 Gabor Szabo: But it doesn't happen automatically. You would have to use a file system module designed to work with iOSync Loop.
358 00:38:52.700 --> 00:39:09.909 Gabor Szabo: And then, this is why Mojo PG, or Mojo MySQL, and so on, were created, because most things in Perl aren't asynchronous. You have to recreate everything to become a sync, and because there isn't a single standard event loop.
359 00:39:09.910 --> 00:39:18.109 Gabor Szabo: You have to design them to work with the specific loops, for example, the IO async loop, or the module I.O. loop, and so on.
360 00:39:18.610 --> 00:39:33.189 Gabor Szabo: And then another comment here related to this, you need a loop to be a sync. When you make DB file system calls, you can create a promise, but that promise lives in the server's event loop.
361 00:39:33.550 --> 00:39:38.870 Gabor Szabo: Or should be, or should to be efficient, I think.
362 00:39:39.130 --> 00:39:42.630 Gabor Szabo: Most async modules have a loop barometer.
363 00:39:44.120 --> 00:39:45.389 Gabor Szabo: That's the comment.
364 00:39:47.030 --> 00:39:50.960 Mohammad Anwar: I think this… I think this is… Very well explained by…
365 00:39:52.160 --> 00:39:55.589 Mohammad Anwar: Yeah, Newkirk… I don't know how you call it, Newk.
366 00:39:55.590 --> 00:39:57.199 Gabor Szabo: Yeah, yeah, yeah.
367 00:39:57.200 --> 00:39:57.840 Mohammad Anwar: Yeah.
368 00:39:58.120 --> 00:40:07.219 Gabor Szabo: Yeah, we can discuss it afterwards. If there are any more comments that you would like to ask, anything else you would like to say, Mohammad, I think…
369 00:40:08.030 --> 00:40:11.950 Gabor Szabo: From my side, I really enjoyed it. I learned how to
370 00:40:12.330 --> 00:40:27.980 Gabor Szabo: I should now go and play with it. I don't know if I will have the time. I would really like to see a bunch of applications, and some people demoing how to, how to use that. Okay, someone says that ask two questions.
371 00:40:28.340 --> 00:40:30.050 Gabor Szabo: But,
372 00:40:30.940 --> 00:40:31.390 Mohammad Anwar: Yeah, dude.
373 00:40:31.390 --> 00:40:33.159 Gabor Szabo: After that, yeah, yeah, I owe them.
374 00:40:33.160 --> 00:40:37.780 Mohammad Anwar: If you really want to play with it, I would suggest
375 00:40:38.140 --> 00:40:57.390 Mohammad Anwar: to look into the examples that are… that's shipped with the distributions. They are quite… they're quite a good starting point if you want to explore how to do certain features in using Peggy FastAPI. They are, like, complete applications. Like, it's… it's a toy application, but it's complete.
376 00:40:57.390 --> 00:41:08.980 Mohammad Anwar: So you get to know exactly how to… to bring in all the features that are supported by the Pagey Fast API, and how you can plug in each other, and then you get a final, like, feature function.
377 00:41:09.020 --> 00:41:09.610 Mohammad Anwar: So, yeah.
378 00:41:09.610 --> 00:41:16.390 Gabor Szabo: I sort of meant, like, real-world application deployed, making tons of money.
379 00:41:16.650 --> 00:41:22.390 Gabor Szabo: That's what I meant. Not just examples, but that's a good start.
380 00:41:24.420 --> 00:41:29.920 Gabor Szabo: I'm just calling for all the other people who are here, so…
381 00:41:30.450 --> 00:41:39.230 Gabor Szabo: Okay, maybe I missed those questions. Next to authentication, what about authorization and audit AA? That's another question.
382 00:41:39.790 --> 00:41:45.389 Gabor Szabo: Next to authentication, what about authorization and audit?
383 00:41:46.920 --> 00:41:53.539 Mohammad Anwar: Okay, so… Is, right now, we don't do that.
384 00:41:53.750 --> 00:41:57.420 Mohammad Anwar: We're also only doing authentication, not authorization at the moment.
385 00:41:59.190 --> 00:42:07.140 Gabor Szabo: Okay, and does PAGI or PAGI FastAPI allow under, like in modularysis? There's an under…
386 00:42:07.420 --> 00:42:09.849 Gabor Szabo: I don't know, it's method or whatever, it's a feature.
387 00:42:11.180 --> 00:42:17.369 Mohammad Anwar: I've not… I've not tried it. I don't know whether it's gonna… how it's gonna behave. I have to try, see if…
388 00:42:20.540 --> 00:42:25.860 Gabor Szabo: Okay, then someone is, has a 538, and so…
389 00:42:25.860 --> 00:42:26.470 Mohammad Anwar: Yeah.
390 00:42:26.470 --> 00:42:27.400 Gabor Szabo: They can't use it.
391 00:42:27.400 --> 00:42:35.470 Mohammad Anwar: I don't know, I don't know why I picked 538, it's just because I want to try the new class syntax.
392 00:42:35.940 --> 00:42:36.690 Mohammad Anwar: I mean…
393 00:42:36.690 --> 00:42:56.630 Gabor Szabo: It shouldn't be a big issue at the end. You can use Docker if you just want to make a totally isolated version of Perl that you can get rid of easily. I have this Docker image that I use for all the things that I play with.
394 00:42:57.090 --> 00:43:03.399 Gabor Szabo: when I play with various things with Sperm, so they will be separated from my regular.
395 00:43:03.400 --> 00:43:14.249 Mohammad Anwar: If it becomes a blocker, I'll probably drop this restriction and go back to, like, a regular, like, a piled object, rather than using this new
396 00:43:14.620 --> 00:43:20.040 Mohammad Anwar: shiny Perl class syntax, if that is, like, a big issue.
397 00:43:20.300 --> 00:43:29.749 Mohammad Anwar: It's just for fun, I said, okay, why not? Because I've never used this in my… any of my distributions. So I thought, let's… let's try. So I… I started using this class.
398 00:43:31.590 --> 00:43:32.510 Gabor Szabo: Okay.
399 00:43:32.540 --> 00:43:55.939 Gabor Szabo: Well, thank you very much. I think we can finish the video recording at least now. Thank you very much for this presentation. Those people who are here in the live session, you can stay around after the session is over, after I stop the recording, then I will turn on the videos again, so you can turn on your video and your mic.
400 00:43:55.940 --> 00:44:06.669 Gabor Szabo: And then we can go and have a conversation. And those people who are watching the video, please like it and follow the channel, and below the video, you will find links to future events.
401 00:44:06.670 --> 00:44:16.310 Gabor Szabo: And also for details about this event that links and whatever, for example, to the profile of Mohammad, in case you would like to get in touch with him.
402 00:44:17.790 --> 00:44:19.019 Gabor Szabo: Thank you very much.
403 00:44:20.590 --> 00:44:31.880 Mohammad Anwar: Thank you, everybody, thank you. As I said, I was nervous when I saw so many people register, and you could tell from my presentation, I did.
404 00:44:32.000 --> 00:44:32.920 Mohammad Anwar: Pause.
405 00:44:33.140 --> 00:44:35.880 Mohammad Anwar: And I was… you can tell I was quite…
406 00:44:36.100 --> 00:44:42.510 Mohammad Anwar: having anxiety, I mean, I didn't know what I'm talking about, but… Very fair, brother.
407 00:44:42.580 --> 00:44:45.670 Gabor Szabo: It worked well. Thank you very much. Goodbye for everyone.
]]>In this presentation we will dive into the Punk ecosystem: an open source MVC web framework with first class openAPI integration, template engine, job queue, json codec, non blocking data layer and http client all built on a highly optimised event-loop web server.
Robert Acock (LNATION) is a CPAN author with over 250 contributions. They run their own contracting company, LNATION LTD. They like to experiment with C/XS, writing Perl as fast as it can be.
1 hour
]]>This was an ad-hoc presentation and thus we did not have an abstract for it.
]]>00:00 Introduction
01:30 OSDC Perl, mention last week
03:00 Nikolai Shaplov NATARAJ, one of our guests author of Lingua-StarDict-Writer on GitLab.
04:30 Nikolai explaining his goals about security memory leak in Net::SSLeay
05:58 What we did earlier. (Low hanging fruits.)
07:00 Let's take a look at the repository of Net::SSLeay
08:00 Try understand what happens in the repository?
09:15 A bit of explanation about adopting a module. (co-maintainer, unauthorized uploads)
11:00 PAUSE
15:30 Check the "river" status of the distribution. (reverse dependency)
17:20 You can CC-me in your correspondence.
18:45 Ask people to review your pull-requests.
21:30 Mention the issue with DBIx::Class and how to take over a module.
23:50 A bit about the OSDC Perl page.
24:55 CPAN Dashboard and how to add yourself to it.
27:40 Show the issues I opened asking author if they are interested in setting up GitHub Actions.
29:25 Start working on Dancer-Template-Mason
30:00 clone it
31:15 perl-tester Docker image.
33:30 Installing the dependencies in the Docker container
34:40 Create the GitHub Workflow file. Add to git. Push it out to GitHub.
40:55 First failure in the CI which is unclear.
42:30 Verifying the problem locally.
43:10 Open an issue.
58:25 Can you talk about dzil and Dist::Zilla?
1:02:25 We get back to working in the CI.
1:03:25 Add --notest to make installations run faster.
1:05:30 Add the git configuration to the CI workflow.
1:06:32 Is it safe to use --notest when installing dependencies?
1:11:05 git rebase squashing the commits into one commit
1:13:35 git push --force
1:14:10 Send the pull-request.
perl Makefile.PL, install dependency, run make and make distdir.META.json file.Makefile.PLorigin) and forking later and calling that fork.Makefile.PL and add the META_MERGE section and verify the generated META.json file.fork as a remote repository and push the branch to it..gitignore and maybe setting up GitHub Action.main branch, create the .gitignore file.Organizations make it easier to have multiple maintainers and thus ensuring continuity of project, but it might also mean that none of the members really feel the urge to continue working on something.
In any case, I tried to collect all the Perl-related GitHub organizations.
Hopefully in ABC order...
Beyond grep - It is mostly for ack, a better grep developed by Andy Lester. No public members. 4 repositories.
Catalyst - Catalyst is a web-framework. Its runtime and various extensions are maintained in this organization. 10 members and 39 repositories.
cpan-authors - A place for CPAN authors to collaborate more easily. 4 members and 9 repositories.
davorg cpan - Organisation for maintaining Dave Cross's CPAN modules. No public members and 47 repositories.
ExifTool - No public members. 3 repositories.
Foswiki - The Foswiki and related projects. 13 members and 649 repositories.
gitpan - An archive of CPAN modules - 2 members and 5k+ read-only repositories.
Kelp framework - a web development framework. 1 member and 12 repositories.
MetaCPAN - The source of the MetaCPAN site - 9 member and 56 rpositories.
Mojolicious - Some Perl and many JavaScript projects. 5 members and 29 repositories.
Moose - Moose,MooseX-*, Moo, etc. 11 members and 69 repositories.
Netdisco - Netdisco and SNMP-Info projects. 10 members and 14 repositories.
PadreIDE - Padre, the Perl IDE. 13 members and 102 repositories.
Paracamelus - No public members. 2 repositories.
Perl - Perl 5 itself, Docker images, etc. 20 members, 8 repositories.
Perl Actions - GitHub Actions to be used in workflows. 5 members and 9 repositories.
Perl Advent Calendar - including the source of perl.com. 3 members and 8 repositories.
Perl Bitcoin - Perl Bitcoin Toolchain Collective. 3 members and 7 repositories.
Perl Toolchain Gang - ExtUtils::MakeMaker, Module::Build, etc. 27 members and 41 repositories.
Perl Tools Team - source of planetperl , perl-ads etc. No public members. 6 repositories.
Perl Dancer - Dancer, Dancer2, many plugins. 30 members and 79 repositories.
perltidy - Only for Perl::Tidy. No public members. 1 repository.
perl5-dbi - DBI, several DBD::* modules, and some related modules. 7 members and 15 repositories.
perl.org - also cpan.org and perldoc.perl.org. 3 members and 7 repositories.
Perl5 - DBIx-Class and DBIx-Class-Historic. No public members. 2 repositories.
perl5-utils - List::MoreUtils, File::ShareDir etc. 2 members and 22 repositories.
Perl-Critic - PPI, Perl::Critic and related. 7 members and 5 repositories.
perl-ide - Perl Development Environments. 26 members and 13 repositories.
perl-pod - Pod::Simple, Test::Pod. 1 member and 4 repositories.
PkgConfig - 1 member 1 repository.
plack - psgi-specs, Plack and a few middlewares. 5 members and 7 repositories.
RexOps - Rex, Rexify and related projects. 1 member and 46 repositories.
Sqitch - Sqitch for Sensible database change management and related projects. No public members. 16 repositories.
StrawberryPerl - The Perl distribution for MS Windows. 4 members and 10 repositories.
Test-More - Test::Builder, Test::Simple, Test2 etc. - 4 members, 27 repositories.
The Enlightened Perl Organisation - Task::Kensho and Task::Kensho::*. 1 member and 1 repository.
Thunderhorse Framework - a modern web development framework. No public members. 4 repositories.
Webmin - Webmin is a web-based system administration tool for Unix-like servers. - 5 repositories.
These are bot Perl-specific GitHub organizations, but some of the repositories are in Perl.
cPanel - Open Source Software provided by cPanel. 1 member and 22 repositories.
DuckDuckGo - The search engine. 19 members and 122 repositories.
Fastmail - Open-source software developed at Fastmail. 4 members and 38 repositories.
RotherOSS - Otobo (OTRS fork). No public members. 47 repositories.
You can lock_hash and later you can unlock_hash if you'd like to make some changes to it.
In this example you can see 3 different actions commented out. Each one would raise an exception if someone tries to call them on a locked hash. After we unlock the hash we can execute those actions again.
I tried this both in perl 5.40 and 5.42.
use strict;
use warnings;
use feature 'say';
use Hash::Util qw(lock_hash unlock_hash);
use Data::Dumper qw(Dumper);
my %person = (
fname => "Foo",
lname => "Bar",
);
lock_hash(%person);
print Dumper \%person;
print "$person{fname} $person{lname}\n";
say "fname exists ", exists $person{fname};
say "language exists ", exists $person{language};
# $person{fname} = "Peti"; # Modification of a read-only value attempted
# delete $person{lname}; # Attempt to delete readonly key 'lname' from a restricted hash
# $person{language} = "Perl"; # Attempt to access disallowed key 'language' in a restricted hash
unlock_hash(%person);
$person{fname} = "Peti"; # Modification of a read-only value attempted
delete $person{lname}; # Attempt to delete readonly key 'lname' from a restricted hash
$person{language} = "Perl"; # Attempt to access disallowed key 'language' in a restricted hash
print Dumper \%person;
$VAR1 = {
'lname' => 'Bar',
'fname' => 'Foo'
};
Foo Bar
fname exists 1
language exists
$VAR1 = {
'language' => 'Perl',
'fname' => 'Peti'
};