My requirements/wish list are as such:
- Very Fast (I need to run a few thousand JS functions per second.)
- Very Fast to compile²/load (It won't be possible to cache the already-compiled² objects because it could be several hours to days between subsequent runs of most of the JS functions. If I can export the compiled² JS as bytes to very quickly load later and store that in a database, that would be fine.)
- Secure (Sandboxed from problematic system calls, with configurations, including at compile²-time.)
- Resource constrained (I don't want my server(s) to start crashing if some JS code uses excessive RAM, or for them to get bogged down by excessive CPU usage, including at compile²-time).
- Very simple API — If possible, I don't want to spend more than a few minutes looking at rustdoc/examples to figure it out, and this is the main issue I see with existing V8 bindings (Maybe I just haven't found the right documentation.).
- For OS/platform support, just Linux optionally with easily-installable system libraries is fine, but if it works on other OSes too for development that's better. The other parts of this list are much more important. Just x86_64 support is fine.
What JS system best meets these requirements for use in Rust?
1: I am open to other well-known scripting languages, and Python is a better fit here given the target users, but I doubt that it is feasible to embed it securely without digging through the guts of CPython. I want to avoid any relatively unknown Rust-specific languages to alleviate any burden of my users having to learn a new language — very few of them will be programmers first.
2: I know that JS isn't traditionally a compiled language like Rust or even Java/C#, but it does generally run in a JIT so compilation takes place.