http-add-on
quickjs-emscripten
Our great sponsors
http-add-on | quickjs-emscripten | |
---|---|---|
9 | 21 | |
290 | 1,122 | |
4.1% | - | |
8.6 | 9.4 | |
6 days ago | 13 days ago | |
Go | TypeScript | |
Apache License 2.0 | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
http-add-on
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Autoscaling Ingress controllers in Kubernetes
KEDA ships with an HTTP add-on to enable HTTP scaling.
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Request-based autoscaling in Kubernetes: scaling to zero
KEDA has a special scaler that creates an HTTP proxy that measures and buffers requests before they reach the app.
- How to descale to zero?
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Ask HN: Who Wants to Collaborate?
I am a core maintainer on the KEDA HTTP Addon project (https://github.com/kedacore/http-add-on). It's 100% written in Go and we are a small group looking for additional contributors. I believe there are interesting challenges ahead of us that will be enjoyable to solve.
If you're interested, please reach out. My username here is the same as my username on the Gophers and Kubernetes slack groups.
(You're of course welcome to just go pick up an issue in the repo if you'd prefer)
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Synchronizing the KEDA HTTP Addon Request Routing Table Across Hundreds of Interceptor Pods
The KEDA HTTP Addon project contains three major components: the operator, scaler and interceptor.
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Fan-in / Fan-out with Go
Hacking on the KEDA HTTP Addon, I found myself having to do something familiar:
- Ask r/kubernetes: What are you working on this week?
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Next Steps for KEDA HTTP
First, we need to finish the minimal infrastructure. The components and supporting artifacts (Helm charts, CI scripts, etc...) are being built in PR #2, and once we have them completed, we will merge it [5]. Second, we need to establish a roadmap. We're beginning to outline it now and will finish it shortly after merging.
quickjs-emscripten
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New QuickJS Release
Based on your comment below I think you figured out the difference - but if you're looking to execute JS, you can pick between ShadowRealm (where available, or using a polyfill) or my library quickjs-emscripten.
Pros of quickjs-emscripten over ShadowRealm:
- You can use quickjs today in any browser with WASM. ShadowRealm isn't available yet, and polyfills have had security issues in the past. See https://www.figma.com/blog/an-update-on-plugin-security/
- In ShadowRealm eval, untrusted code can consume arbitrary CPU cycles. With QuickJS, you can control the CPU time used during an `eval` using an [interrupt handler] that's called periodically during the eval.
- In ShadowRealm eval, untrusted code can allocate arbitrary amounts of memory. With QuickJS, you can control both the [stack size] and the [heap size] available inside the runtime.
- quickjs-emscripten can do interesting things with custom module loaders and facades that allow synchronous code inside the runtime to call async code on the host.
Pros of ShadowRealm over QuickJS:
- ShadowRealm will (presumably?) execute code using your native runtime, probably v8, JavaScriptCore, or SpiderMonkey. Quickjs is orders of magnitude slower than JIT'd javascript performance of v8 etc. It's also slower than v8/JSC's interpreters, although not by a huge amount. See [benchmarks] from 2019.
- You can easily call and pass values to ShadowRealm imported functions. Talking to quickjs-emscripten guest code requires a lot of fiddly and manual object building.
- Overall the quickjs(-emscripten) API is verbose, and requires manual memory management of references to values inside the quickjs runtime.
[interrupt handler]: https://github.com/justjake/quickjs-emscripten/blob/main/doc...
[stack size]: https://github.com/justjake/quickjs-emscripten/blob/main/doc...
[heap size]: https://github.com/justjake/quickjs-emscripten/blob/main/doc...
[benchmarks]: https://bellard.org/quickjs/bench.html
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Extism Makes WebAssembly Easy
The thing I want to achieve with WebAssembly is still proving a lot harder than I had anticipated.
I want to be able to take strings of untrusted code provided by users and execute them in a safe sandbox.
I have all sorts of things I want this for - think custom templates for a web application, custom workflow automation scripts (Zapier-style), running transformations against JSON data.
When you're dealing with untrusted code you need a really robust sandbox. WebAssembly really should be that sandbox.
I'd like to support Python, JavaScript and maybe other languages too. I want to take a user-provided string of code in one of those languages and execute that in a sandbox with a strict limit on both memory usage and time taken (so I can't be crashed by a "while True" loop). If memory or time limit are exceeded, I want to get an exception which I can catch and return an error message to the user.
I've been exploring options for this for quite a while now. The furthest I've got was running Pyodide inside of Deno: https://til.simonwillison.net/deno/pyodide-sandbox
Surprisingly I've not found a good pattern for running a JavaScript interpreter in a WASM sandbox yet. https://github.com/justjake/quickjs-emscripten looks promising but I've not found the right recipe to call it from server-side Python or Deno yet.
Can Extism help with this? I'm confident I'm not the only person who's looking for a solution here!
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Node on Web. Use Nodejs freely in your browser with Linux infrastructure.
"Safely execute untrusted Javascript in your Javascript, and execute synchronous code that uses async functions" quickjs-emscripten, NPM
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Sandboxing JavaScript Code
This maybe, as a start?
https://github.com/justjake/quickjs-emscripten
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Hacker News top posts: Nov 20, 2022
QuickJS Running in WebAssembly\ (17 comments)
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QuickJS Running in WebAssembly
The library was inspired by Figma’s blog posts about their plug-in system: https://github.com/justjake/quickjs-emscripten#background
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Show HN: Run unsafe user generated JavaScript in the browser
If you need to call into user-generated Javascript synchronously or have greater control over the sandbox environment, you can use WebAssembly to run a Javascript interpreter: https://github.com/justjake/quickjs-emscripten#quickjs-emscr...
QuickJS in WebAssembly is much slower than your browser's native Javascript runtime, but possibly faster than async calls using postMessage. As an added bonus, it can make async functions in the host appear to be synchronous inside the sandbox using asyncify: https://emscripten.org/docs/porting/asyncify.html.
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Why Would Anyone Need JavaScript Generator Functions?
You can use One Weird Trick with generator functions to make your code "generic" over synchronicity. I use this technique to avoid needing to implement both sync and async versions of some functions in my quickjs-emscripten library.
The great part about this technique as a library author is that unlike choosing to use a Promise return type, this technique is invisible in my public API. I can write a function like `export function coolAlgorithm(getData: (request: I) => O | Promise): R | Promise`, and we get automatic performance improvement if the user's function happens to return synchronously, without mystery generator stuff showing up in the function signature.
Helper to make a function that can be either sync or async: https://github.com/justjake/quickjs-emscripten/blob/ff211447...
Uses: https://cs.github.com/justjake/quickjs-emscripten?q=yield*+l...
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Why Am I Excited About WebAssembly?
This seems like a pretty nice, recently enabled way of getting a sandboxed js environment: QuickJS compiled to WASM: https://github.com/justjake/quickjs-emscripten.
What are some alternatives?
keda - KEDA is a Kubernetes-based Event Driven Autoscaling component. It provides event driven scale for any container running in Kubernetes
wasmtime - A fast and secure runtime for WebAssembly
k8s-image-swapper - Mirror images into your own registry and swap image references automatically.
wasmer - 🚀 The leading Wasm Runtime supporting WASIX, WASI and Emscripten
relevant_xkcd - A reccomender engine for relavent xkcd comics
wizer - The WebAssembly Pre-Initializer
dbench - Benchmark Kubernetes persistent disk volumes with fio: Read/write IOPS, bandwidth MB/s and latency
rr - Record and Replay Framework
Yacy - Distributed Peer-to-Peer Web Search Engine and Intranet Search Appliance
go - The Go programming language
rsyscall - Process-independent interface to Linux system calls
iPlug2 - C++ Audio Plug-in Framework for desktop, mobile and web