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[Other] Show HN: Structured Cooperation – A new way of building distributed apps & POC Hey HN,<p>I wanted to share something I&#x27;ve been working on for the past couple of months, which may be interesting to developers interacting with distributed architectures (e.g., microservices).<p>I&#x27;m a backend developer, and in my 9-5 job last year, we started building a distributed app - by that, I mean two or more services communicating via some sort of messaging system, like Kafka. This was my first foray into distributed systems. Having been exposed to structured concurrency by Nathan J. Smith&#x27;s beautiful article on the subject (<a href="https:&#x2F;&#x2F;vorpus.org&#x2F;blog&#x2F;notes-on-structured-concurrency-or-go-statement-considered-harmful" rel="nofollow">https:&#x2F;&#x2F;vorpus.org&#x2F;blog&#x2F;notes-on-structured-concurrency-or-g...</a>), I started noticing the similarities between the challenges of this message-based communication, and that of concurrent programming, and GOTO-based programming before that - actions at a distance, non-trivial tracing of failures, synchronization issues, etc. I started suspecting that if the symptoms were similar, maybe the root cause, and therefore the solution, could be as well.<p>This led me to design something I&#x27;m calling &quot;structured cooperation&quot;, which is basically what you get when you apply the principles of structured concurrency to distributed systems. It&#x27;s something like a &quot;protocol&quot;, in the sense that it&#x27;s basically a set of rules, and not tied to any particular language or framework. As it turns out, obeying those rules has some pretty powerful consequences, including:<p>- Pretty much eliminates race conditions caused by eventual consistency<p>- Allows you to recover something resembling distributed exceptions - stack traces and the equivalent of stack unwinding, but across service boundaries<p>- Makes it much easier to reason about the system as a whole<p>I put together three articles that explain:<p>1) what structured cooperation is (<a href="https:&#x2F;&#x2F;developer.porn&#x2F;posts&#x2F;introducing-structured-cooperation&#x2F;" rel="nofollow">https:&#x2F;&#x2F;developer.porn&#x2F;posts&#x2F;introducing-structured-cooperat...</a>),<p>2) one way you could implement it (<a href="https:&#x2F;&#x2F;developer.porn&#x2F;posts&#x2F;implementing-structured-cooperation&#x2F;" rel="nofollow">https:&#x2F;&#x2F;developer.porn&#x2F;posts&#x2F;implementing-structured-coopera...</a>), and<p>3) why it works (<a href="https:&#x2F;&#x2F;developer.porn&#x2F;posts&#x2F;framing-structured-cooperation&#x2F;" rel="nofollow">https:&#x2F;&#x2F;developer.porn&#x2F;posts&#x2F;framing-structured-cooperation&#x2F;</a>).<p>I also put together a heavily documented POC implementation in Kotlin, called Scoop (linked in the title). I guess you could call it an orchestration library, similar to e.g. Temporal (<a href="https:&#x2F;&#x2F;temporal.io&#x2F;" rel="nofollow">https:&#x2F;&#x2F;temporal.io&#x2F;</a>), although I want to stress that it&#x27;s just a POC, and not meant for production use.<p>I was hoping to bounce this idea off the community and see what people think. If it turns out to be a useful way of doing things, I&#x27;d try and drive the implementation of something similar in existing libraries (e.g. the aforementioned Temporal, Axon (<a href="https:&#x2F;&#x2F;www.axoniq.io&#x2F;products&#x2F;axon-framework" rel="nofollow">https:&#x2F;&#x2F;www.axoniq.io&#x2F;products&#x2F;axon-framework</a>), etc. - let me know if you know of others where this would make sense). As I mention in the articles, due to the heterogeneous nature of the technological landscape, I&#x27;m not sure it&#x27;s a good idea to actually try to build a library, in the same way as it wouldn&#x27;t make sense to do a &quot;structured concurrency library&quot;, since there are many ways that &quot;concurrency&quot; is implemented. Rather, I tried to build something like a &quot;reference implementation&quot; that other people can use as a stepping stone to build their own implementations.<p>Above and beyond that, I think that this has educational value as well, and I did my best to make everything as understandable as possible. Some things I think are interesting:<p>- Implementation of distributed coroutines on top of Postgres<p>- Has both reactive and blocking implementation, so can be used as a learning resource for people new to reactive<p>- I documented various interesting issues that arise when you use Postgres as an MQ (see, in particular, <a href="https:&#x2F;&#x2F;github.com&#x2F;gabrielshanahan&#x2F;scoop&#x2F;blob&#x2F;09db323bf6c8a72ca34b50392928db13f80dcc15&#x2F;src&#x2F;main&#x2F;resources&#x2F;db&#x2F;migration&#x2F;V2__create_message_event_table.sql#L20">https:&#x2F;&#x2F;github.com&#x2F;gabrielshanahan&#x2F;scoop&#x2F;blob&#x2F;09db323bf6c8a7...</a> and <a href="https:&#x2F;&#x2F;github.com&#x2F;gabrielshanahan&#x2F;scoop&#x2F;blob&#x2F;09db323bf6c8a72ca34b50392928db13f80dcc15&#x2F;src&#x2F;main&#x2F;kotlin&#x2F;io&#x2F;github&#x2F;gabrielshanahan&#x2F;scoop&#x2F;blocking&#x2F;coroutine&#x2F;structuredcooperation&#x2F;MessageEventRepository.kt#L676">https:&#x2F;&#x2F;github.com&#x2F;gabrielshanahan&#x2F;scoop&#x2F;blob&#x2F;09db323bf6c8a7...</a>)<p>Let me know what you think.

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[Other] Show HN: Voltpeek – Vim-inspired oscilloscope software This is software for my headless, PC based oscilloscope, which is controlled entirely via commands similar to the Vim text editor. I built this because I liked the idea of headless oscilloscopes; I always have my laptop around when I’m working on electronics anyway, and it’s very convenient to save images of captured waveforms. However, I found the software for off the shelf models to be annoying and cumbersome to work with. In my experience, this holds true both when opening the software and connecting to an attached oscilloscope, and when adjusting the scope settings using menus and buttons. I have also built my own oscilloscope hardware for use with Voltpeek. The specs are nothing to write home about (7.5MHz BW, 62.5MS&#x2F;s), but they should be adequate for some basic debugging and measurement tasks.

[Other] Show HN: Mathpad – Physical keypad for typing math symbols Here&#x27;s something different than your usual fare: A physical keypad that lets you directly type math!<p>Ever tried typing mathematical equations in your code IDE, email, or on Slack? You might know it can be tricky. Mathpad solves this with dedicated keys for Greek letters, calculus symbols, and more. Press the ∫ key and get ∫, in any application that accepts text. It uses Unicode composition, so it works everywhere: Browsers, chat apps, code editors, Word, you name it. Basically, anywhere you can type text, Mathpad lets you type mathematics.<p>I built Mathpad after getting frustrated with the friction of typing equations in e.g. Word, and what a pain in the ass it was to find the specific symbols I needed. I assumed that a product like Mathpad already existed, but that was not true and I had to build it myself.<p>It turned out to be pretty useful! Three years of solo development later, I&#x27;m launching on Crowd Supply. One of the trickiest parts of this project was finding someone who could manufacture custom keycaps with mathematical symbols. Shoutout to Loic at 3dkeycap.com for making it possible!<p>Fully open source (hardware + software): <a href="https:&#x2F;&#x2F;github.com&#x2F;Summa-Cogni&#x2F;Mathpad">https:&#x2F;&#x2F;github.com&#x2F;Summa-Cogni&#x2F;Mathpad</a> Campaign: <a href="https:&#x2F;&#x2F;www.crowdsupply.com&#x2F;summa-cogni&#x2F;mathpad" rel="nofollow">https:&#x2F;&#x2F;www.crowdsupply.com&#x2F;summa-cogni&#x2F;mathpad</a> Project log: <a href="https:&#x2F;&#x2F;hackaday.io&#x2F;project&#x2F;186205-mathpad-the-math-keypad" rel="nofollow">https:&#x2F;&#x2F;hackaday.io&#x2F;project&#x2F;186205-mathpad-the-math-keypad</a>