Show HN: I built a guided Build your own DNS Server challenge https://bit.ly/3SWERsE

Show HN: I built a guided Build your own DNS Server challenge Hey everyone. It's Sherub here, author of the Build your own DNS Server challenge on CodeCrafters. Currently it’s available in Rust, Go, and Python and is free while in beta. https://bit.ly/47xgQwE I've kept the challenge accessible but still challenging for an intermediate developer. This challenge, like others from CodeCrafters, is self-paced. You can use any tools you prefer (terminal, editor, etc.) to build the project. At the end of the challenge, you will have created a DNS forwarding server. The server can create and read DNS packets and respond to DNS queries. As you go, you'll learn about the DNS protocol, its format, servers, and A records. All while getting to hone your language skills. Some of the challenges and choices I had to make: * To make the stages easier, I had to break them up, such that each step builds on the previous one. This was especially challenging for the 2nd stage, where we write a DNS packet's header contents. Even though I’d have liked it to be easier, breaking it up further would have been weird. * Instead of implementing a recursive resolver, I've restricted to a forwarding server. We made this decision so that most developers can still use it. To add more complexity, we can use a challenge extension (noted below). * Deciding how much instruction and context the stages should provide. I’ve decided to keep them as thorough as possible for most of the stages. Developers can choose to have thorough details or just skim through them. I would love your feedback and questions on the challenge. You can try it out for free here: https://bit.ly/47xgQwE (no CC required). I also have challenge extensions planned. You can find them at https://bit.ly/47MTqDl... . I'm also keen to hear what you think about the extension ideas. https://bit.ly/40SIeD3 November 27, 2023 at 07:36AM

Show HN: Upcoming – Explore what's coming next https://bit.ly/3sQieLN

Show HN: Upcoming – Explore what's coming next Get a weekly preview of upcoming movies, TV shows, books, music, games, and events. Add them to your calendar and don't miss out on what's coming this week! https://bit.ly/3Gfvj4q November 27, 2023 at 04:09AM

Show HN: GitAware – A simple browser extension that helps you stay on top of MRs https://bit.ly/47Mjrmf

Show HN: GitAware – A simple browser extension that helps you stay on top of MRs https://bit.ly/46tRajf November 26, 2023 at 04:17PM

Show HN: LockDB now natively supports acting on multiple locks https://bit.ly/3MY5qty

Show HN: LockDB now natively supports acting on multiple locks LockDB is a cross-platform tool you can use to handle process/event locking and avoid race conditions. It is sometimes also known as a semaphore. There are packages for Node.js / Browser / Bun / NPM, Deno, and you can also use it as a CLI. The new LockDB release supports a feature request common for complex locking necessities: The ability to lock, unlock, and check multiple locks. I understand new features aren't _generally_ accepted [1] here, but this one seemed "juicy" enough for it. Feel free to remove the post if I'm wrong, and I apologize in that case! [1]: https://bit.ly/3uv7hQm https://bit.ly/3T5qyls November 26, 2023 at 09:42AM

Show HN: An open-source notification infrastructure https://bit.ly/3uxQVqe

Show HN: An open-source notification infrastructure https://bit.ly/3Rfn1jf November 26, 2023 at 06:58AM

Show HN: pytunes – Free and open-source music streaming service https://bit.ly/46vAwQg

Show HN: pytunes – Free and open-source music streaming service https://bit.ly/46vAxDO November 25, 2023 at 11:50PM

Show HN: I created an indie Product Hunt alternative https://bit.ly/3utYga9

Show HN: I created an indie Product Hunt alternative https://bit.ly/49Vbe0Q November 25, 2023 at 11:15AM

Show HN: The open-source alternative to the GPT Store https://bit.ly/47vMafg

Show HN: The open-source alternative to the GPT Store https://bit.ly/46tJkq0 November 25, 2023 at 05:45AM

Show HN: 25% Off 1MB's Static Website Hosting https://bit.ly/46utco0

Show HN: 25% Off 1MB's Static Website Hosting https://bit.ly/49Ltkm9 November 24, 2023 at 06:39PM

Show HN: React Spreadsheet 2 https://bit.ly/47kACvn

Show HN: React Spreadsheet 2 https://bit.ly/47aMgJu November 23, 2023 at 09:37AM

Show HN: MesoSim – DSL for Options Trading https://bit.ly/46oiL5u

Show HN: MesoSim – DSL for Options Trading Hello, I quit my engineering job in 2021 to fully focus on trading. After a year of limited success with stocks (algos floating around break-even) I started studying Options. It turned out that selling options (risk premia harvesting) is a sound approach for income generation. Back in the day there were no suitable automated backtesters to effectively study these trades, so I built one: I infused JSON with Lua to create a Job Definition which models how Options Traders build, adjust and hedge their positions. Fast forward to today, many retail traders and small hedge funds are using MesoSim on a daily basis. They executed over 120k backtests with strategies frequently reaching (and exceeding) Sharpe Ratio of 3. You can also try it after a free signup I'm doing my best to provide educational material via blog posts on public income trades, such as: - The weekend effect: https://bit.ly/3umUm2M - Volatility Hedged Theta Engine: https://bit.ly/47QTsu5 - NetZero Trade: https://bit.ly/46nL8Re - and more under our strategy library: https://bit.ly/3MZuEIi As of today the live part is running as a private beta and targetting to fix the annoyances around these complex instruments. Tech details: The solution is created using C# with Blazor as I prefer not to touch JS or TS. When I started I knew very little about C#, and nothing about blazor and dotnet (I'm a linux person). I have no regret choosing these technologies. During the process I also fell in love with Lua, a language I'll definitely use in the future. Please check it out and let me know what you think. Thanks for your kind feedback! https://bit.ly/40Q7vO8 November 24, 2023 at 08:28AM

Show HN: Lua Carousel, create little programs on desktop or mobile devices https://bit.ly/47qh7Sh

Show HN: Lua Carousel, create little programs on desktop or mobile devices https://bit.ly/3QT2for November 23, 2023 at 10:22PM

Show HN: SQL Interface to "AWS What's New" Using Datasette https://bit.ly/3sEmxtL

Show HN: SQL Interface to "AWS What's New" Using Datasette In time for AWS re:Invent 2023 next week, I’ve been building a site that provides a SQL interface to the AWS What’s New ( https://go.aws/3SWX9u0 ) feed for all time! It’s mostly an excuse for learning about a few technologies… DuckDB, Pandas, Datasette and brushing up on my Python. You can look at the example queries or write your own! https://bit.ly/3GbvbTJ November 24, 2023 at 01:57AM

Show HN: Go bindings to SQLite using wazero https://bit.ly/3MZ9KsO

Show HN: Go bindings to SQLite using wazero https://bit.ly/40POAD6 November 24, 2023 at 01:06AM

Show HN: New Version of MyOwnDB https://bit.ly/3G8rYEp

Show HN: New Version of MyOwnDB After nearly 5 years of development, I'm happy but also a bit anxious to Show HN the new version of MyOwnDB [1], a web application for data management at human scale. The app was initially published in 2006 using the then-recent Ruby on Rails, and incorporating fresh Ajax (YUI) and cloud (S3) technologies. Although the app stayed available all these years, it stagnated feature-wise because making changes appeared to become harder and harder due to some technology choices. Learning lessons from that [2], I decided to rewrite it, and chose F#[3] and WebSharper[4]. Those proved to be good choices, but now comes the harder part for me: promoting it and commercialising it. I think the app proposes some interesting features like: - multi-lingual UI - lots of help throughout the app - intuitive data types like file attachments, email address, URL, choice in a list, ... - a form embeddable in a website for data collection These are some points I'm currently working on regarding the commercialisation of the app (suggestions welcome!): - I'm working on proposing paid plans for the hosted app [5] (currently putting everybody on a free plan). - the code is published on Gitlab[6] under the AGPL license. Maybe proposing an additional commercial license would help, but in that case I'll need to use a Contributor License Agreement, which is an additional hurdle for outside contributors. Anyone having experience with that? - I might need to identify and focus on a niche for the app. Any suggestion? - I'm looking at easy migration from the hosted app to a self-hosted instance as I would like to build a business on trust. [1] https://bit.ly/40XP1eI [2] https://bit.ly/3MXMY4y [3] https://bit.ly/3Ga527N [4] https://bit.ly/3Gddcw3 [5] https://bit.ly/3GwgtqB [6] https://bit.ly/3sNBZDL https://bit.ly/40XP1eI November 22, 2023 at 11:10AM

Show HN: Cyberkitty – an experimental hybrid-GPT+Human long-form fiction editor https://bit.ly/3SVOfN8

Show HN: Cyberkitty – an experimental hybrid-GPT+Human long-form fiction editor NOTE: If you're one of the first people to see this, you can also access a running installation at https://bit.ly/47r8t5Z It'll run until I hit my GPT-4 budget limit, then stop working. Be warned that it's in single user, so nothing is private! ---- Last week I came down with a fever and decided to run some experiments on whether the new GPT could generate long-form fiction. Around the same time, I saw a HN comment about how technology gains have lead SWEs to work at higher levels of abstraction—and I thought “huh, why not writers?” Anyway so I was locked indoors for a week and a half and I spent it coding an answer that question. Most of the magic sauce here is just in making it feel really snappy and good to edit—making it easy for the human to collaborate with the objectively faster LLM. The underlying prompt engineering is cool, but it’s the feeling that you can do more than just shoot a prompt at ChatGPT and hope for a good result, or start writing and hope for a good autocomplete. Definitely gave me some ideas for future LLM experiences I want to try out, let me know what you think! https://bit.ly/3sQYJ5K November 22, 2023 at 11:11PM

Show HN: I made a React Native Boilerplate to ship mobile apps faster https://bit.ly/47qnJ2L

Show HN: I made a React Native Boilerplate to ship mobile apps faster https://bit.ly/47qXvgC November 21, 2023 at 08:44PM

Show HN: Open Source Cloud Costs Monitoring in Docker https://bit.ly/3RbLHZS

Show HN: Open Source Cloud Costs Monitoring in Docker OpenCost is an open source implementation for Kubernetes cost monitoring and now cloud cost monitoring for AWS, Azure, and GCP. The project makes all of this data accessible via an API and user interface. While discussing the idea of running OpenCost on platforms besides Kubernetes we realized that with this new Cloud Costs feature there are users who want API access to their cloud billing data without needing to run on Kubernetes. I opened the Issue OpenCost without Kubernetes #2268 and as luck would have it, we had our internal Hackathon last week. If you're not familiar with OpenCost, it's the open source CNCF project for monitoring Kubernetes and cloud spending. It's a Golang implementation of the OpenCost Specification for monitoring Kubernetes cloud costs. It has an optional web UI and you can also run it as a Prometheus metrics exporter. The code is all at https://bit.ly/3Rb7HnZ and you can learn more about the project at https://bit.ly/3QRG8OT https://bit.ly/3MR0uGY November 21, 2023 at 11:09PM

Show HN: Open-Source Library OpenAI/Azure Fallback Tool https://bit.ly/3RcDipn

Show HN: Open-Source Library OpenAI/Azure Fallback Tool We just launched an emergency OpenAI + Azure fallback and retry tool (literally OpenAI's APIs are down as I post this!): https://bit.ly/3ujTjRa This open source library helps you mitigate errors & downtime from @OpenAI's APIs by falling back to Azure (and vice versa). If you need expedited access to Azure, feel free to email me - I can get you connected to our Azure account executive! (Startups with funding ONLY please!) Hope this helps some people out there! https://bit.ly/3ujTjRa November 22, 2023 at 01:37AM

Show HN: A Geo-Distributed KV Store for Metadata Management https://bit.ly/40R44qy

Show HN: A Geo-Distributed KV Store for Metadata Management https://bit.ly/40LWEVk November 20, 2023 at 07:15PM