Development on ShrimpWorks

MQTT Implementation in UnrealScript

Sat, 09 Jul 2022 00:00:00 +0000

TLDR; There’s now an MQTT Client implementation written in UnrealScript

I’ve been doing a bit of stuff in UnrealScript recently, and reacquainting myself with it.

Something I’ve always been aware of, but have never really looked at in much detail, is that it has an actual TCP client you can extend to implement whatever remote communications protocol you’d like.

For whatever reason MQTT popped up as my candidate to play with, with the thought that you’d be able to publish in-game events to some topics and build interesting things with (the first thing that came to mind was a match stats collection service which doesn’t rely on the traditional process of log scraping), in addition to allowing in-game functionality to respond to incoming events by way of topic subscriptions. And being something targeted at supporting very simple IoT devices, the protocol should be fairly easy to work with.

Use Java's built-in HTTP Server for Mocking

Fri, 06 Nov 2020 00:00:00 +0000

Frequently while implementing HTTP API or other HTTP clients, you want to be able to test your client implementation against an actual HTTP service, which helps validate that your headers are set correctly, body is serialised appropriately, and responses are parsed as expected.

This can be done through the use of various additional libraries and mocking frameworks, however I’d argue that for most use cases, something that can simply validate and respond to an HTTP request is more than enough.

Run Your Java Services with SystemD

Tue, 01 Sep 2020 00:00:00 +0000

There’s a strong tendency to want to run everything in Docker these days, especially if you’re trying to run something as an always-on service, since passing --restart=always to your run invocation or Docker Compose configuration ensures that running containers start back up after reboots or failures, and seems to involve a little less “black magic” than actually configuring software to run as services directly on a host.

The downside to this is the approach is that running a service in a container leads to significantly longer startup times, more memory and CPU overhead, lost logs, and in my opinion offer a false sense of security and isolation since most images are still configured to run as root, and more often than not large swathes of the host filesystem are mounted as volumes to achieve simple tasks.

There’s also a belief that your software will magically run anywhere - but if you’re writing Java (or any JVM language) code - that’s one of Java’s biggest selling points - it already has its own VM your code is running in, no most platforms!

Therefore, let’s see how easy it actually is to configure our software to run as a standard system service, providing us with the ability to run it as a separate restricted user, complete with standard logging configuration, and give us control over via standard service myservice start|status|restart|stop commands.

Simple Java Value Objects

Sun, 11 Aug 2019 00:00:00 +0000

It’s a really simple thing, but I’ve been using this simple “pattern” for defining simple value objects for years, and it has served me well.

While there’s nothing particularly special about this style, I still see a significant amount of Java code needlessly following the JavaBeans style, when using these objects as Beans in the strict sense is not actually desired, intended, or required, and simply makes code needlessly verbose and leaves objects implemented as Beans open to abuse due to leaving their internal state open for mutation.

Unreal Archive

Sat, 16 Mar 2019 00:00:00 +0000

Over the past several months, I’ve been working on a project to provide a place to catalogue and preserve the vast amounts of user-created content the Unreal and Unreal Tournament community has been creating over the past 20+ years.

This has resulted in the Unreal Archive.

While it may seem a silly cause to invest so much time (and money) into, this stuff directly influenced the lives of myself and thousands of others. I would certainly not be in the profession I’m in, driving my car, living in my house, if not for the direct influence of working on Unreal Tournament maps, mods and community, and personal websites.

UTStatsDB

Sun, 17 Jun 2018 00:00:00 +0000

UTStatsDB is a player and match statistics system for Unreal Tournament 99, 2003, 2004 and 3, which parses match logs generated by each game (sometimes requiring additional server-side mutators), and makes stats for each game available through a website.

The stats are also aggregated by player, map and server, allowing you to browse and analyse quite a number of in-depth stats for each.

The project was developed and maintained by Patrick Contreras and Paul Gallier between 2002 and around 2009, where the original project seems to have been abandoned some time after the release of UT3. (addendum: by some coincidence, after 9 years of inactivity, the original author did create a release a few days after my revival/release) Locating downloads (the download page is/was not working) or the source (their SCM system seems to require auth or is simply gone) was quite troublesome.

Aurial, HTML5 Subsonic Music Player

Mon, 29 May 2017 00:00:00 +0000

I have finally decided to release version 1.0 of Aurial, my implementation of a music player/client for the Subsonic music server.

I started this around two years ago, some time after switching my primary desktop from Windows to Linux, and I really missed foobar2000 - it has been my primary music player ever since. Unfortunately I have an irrational aversion to using Wine to run Windows applications, and none of the native music players on Linux felt good to me. As I already ran a Subsonic music server, I thought I’d just make use of that.

Client-Side Processing of Images with JavaScript Before Uploading

Tue, 07 Mar 2017 00:00:00 +0000

The title’s quite silly unfortunately, but I was recently doing some experimentation with uploading images to CouchDB directly from a browser. I needed to scale the images before storage, and since I was talking directly to the CouchDB service without any kind of in-between API services or server-side scripts, needed a way to achieve this purely on the client.

Thanks to modern APIs available in browsers, combined with a Canvas, it’s actually reasonably simple to process a user-selected image prior to uploading it to the server without the need for any third-party libraries or scripts.

Out of Eve 3.0 released

Sat, 07 May 2016 00:00:00 +0000

After almost exactly two years since the last release of Out of Eve, here is version 3.0.

As may be noted from the release note, the main goal of this release is to catch everything up with the current state of EVE, it’s API, and the static data dump.

Along the way some new stuff was also added an improved, like the new menu system which allows access to all your characters, so there’s no need to switch between them and then view detail pages, and the introduction of memcached caching, which stores and retrieves entities loaded from the static database dump, reducing page load times and database accesses (a single page load may result in hundreds of individual MySQL queries).

Lightweight Lightbox

Tue, 29 Mar 2016 00:00:00 +0000

It seems surprisingly difficult to find a simple lightbox implementation which doesn’t rely on jQuery. I wanted something simple for this site, but did not want to have to re-do any HTML, so came up with a basic JavaScript and CSS solution.

This also turned out to be a useful lesson in “modern” jQuery-less DOM manipulation. I found 10 Tips for Writing JavaScript without jQuery quite useful in this regard.

For the Lightbox/pop-up itself, the Pure CSS Lightbox by Gregory Schier served as an excellent reference and starting point.