"All entropy sources failed" on wasm32-wasi

[devsnek]

A project i'm trying to build fails with All entropy sources failed (permanently unavailable); cause: OsRng: support for wasm32 requires emscripten, stdweb or wasm-bindgen (permanently unavailable), though getrandom says it supports __wasi_random_get

[newpavlov]

Looks like you are not building for WASI target (note: WASM is like CPU architecture and WASI is in a certain sense an operating system, so the first does not necessarily imply the second). Depending on that you use, enable stdweb or wasm-bindgen feature for getrandom crate. You can do it be adding this line to your project's Cargo.toml dependencies section:

getrandom = { version = "*", features = ["wasm-bindgen"] }

[devsnek]

i'm doing cargo build --target wasm32-unknown-wasi. (and I'm aware what WASI is to WASM)

[dhardy]

As I said in the other issue, use the target wasm32-wasi (check the changelog).

[devsnek]

updating to rustc beta and using wasm32-wasi produces the same error.

[newpavlov]

Hm, this is strange... I can't find from where this error comes. Search does not show any code in this and rand repository which produces it. What versions of getrandom/rand do you use? Have you tried to use getrandom directly?

Note that getrandom is used only since rand v0.7 and rand_os v0.2, and IIRC earlier versions of those crates did not support WASI.

[devsnek]

using rand 0.7.0-pre.1 worked.