It will be nice to write a Crystal program and when there is a need to squeeze more performance, to use call a Rust code from the Crystal program. In addition it will just be a fun way to learn both languages. Can someone share a step by step instructions for doing it? Google search sent me to this…

[image] straight-shoota: I’m confused. How do you expect to gain more performance from Rust? Rust and Crystal should be roughly on par performance wise. Rust has a more mature and performant multi-threading environment than Crystal currently has, which could be leveraged.

Hello, Perfs are similar. I use FFI to be able to use some crates in Crystal, it allows to use Rust’s echo-system. If it helps, here’s a little POC in bulk. ├── Cargo.lock ├── Cargo.toml ├── Makefile ├── shard.yml ├── spec │ ├── myapp_spec.cr │ └── spec_helper.cr ├── src │ ├── lib.rs │ └…

I love stuff like this because it’s like “mad scientist” type stuff :laughing: I can’t wait to see what else you come up with this.

There is plenty reason to do this. For example, Rust can compile to WASM and Crystal cannot. Moreover. Rust has many blockchain SDKs whereas Crystal none. Yet Crystal can be used for a lot of the logic and interop. Rails has Helix to do this. Doing this with Crystal would be nice.

Crystal can generate WASM as it uses LLVM and WASM is one of LLVM targets

I thought there were still issues with this because Crystal was missing a few things to be able to do this? [image] Crystal in (possible) WASM everywhere future? It goes a little bit beyond that, but that’s generally the case. I’ve investigated porting Crystal to wasm32-…

This is correct. Without the WASM ABI added to Crystal, there’s no WASM codegen support (plus allllll the other things outlined in the above post)

I know that garbage collection was a proposal on WASM a year or two ago; has that been officially included as part of the standard (/ is it available in the LLVM implementation)? It seems like that would be a major blocker (in addition to threads), and even then we’d probably need to write something…

@RespiteSage Please see the above linked post. Would be happy to continue discussion about WASM there, but probably not relevant further in this post about using Rust alongside Crystal.

In our scenario, one reason is to embed a HTTP/3 proxy library made in Rust. Currently, AFAIK there is no HTTP/3 library available in Crystal. Being able to use Rust inside Crystal allows us to benefit from the bigger library ecosystem, like the HTTP/3 library from the example above.

Using Rust inside a Crystal program

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jwoertink June 8, 2021, 3:14pm 9

I thought there were still issues with this because Crystal was missing a few things to be able to do this?

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Using Rust inside a Crystal program

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