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Allow v3, v4, v5 features on wasm32-unknown-unknown #512

merged 1 commit into from Apr 30, 2021

Allow v3, v4, v5 features on wasm32-unknown-unknown #512

merged 1 commit into from Apr 30, 2021


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@Expyron Expyron commented Jan 29, 2021

I'm submitting a feature


The v3, v4, v5 features did not work on wasm32-unknown-unknown in a no_std context.

For v3 and v5, the md5 and sha1 crates are no_std if their default features are disabled, so they work on wasm32-unknown-unknown.

For v4, getrandom can work on any architecture if the root crate registers a custom implementation.

This is not a breaking change, as the other architectures (including stdweb and wasm-bindgen) are not impacted.


I wanted to use this crate (especially the v4 feature) on a wasm32-unknown-unknown context that does not have stdweb nor wasm-bindgen.


The test suite unfortunately does not run on wasm32-unknown-unknown.
The v3, v4, v5 features work properly, as I was able to use them from a dependent crate.

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@KodrAus KodrAus commented Jan 30, 2021

Thanks for the PR @Expyron!

I’m a little unsure about committing to getrandom here by guaranteeing a registered implementation will work, but otherwise this seems totally reasonable to me!

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@Expyron Expyron commented Jan 30, 2021

I also want to point out that getrandom will refuse to compile on an unsupported target if a custom function is not provided, with a clear error message:

error: target is not supported, for more information see:

That error message would be preferable to the current behavior, which is that Uuid::new_v4() is not defined at all.

API documentation for the Rust `getrandom` crate.

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@lastmjs lastmjs commented Apr 2, 2021

Is there anything holding this up? I'm starting to develop on DFINITY's Internet Computer, which is a custom WebAssembly environment, and it doesn't like like I can use UUID easily until this is fixed

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@kinggoesgaming kinggoesgaming commented Apr 30, 2021

bors r+

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@bors bors bot commented Apr 30, 2021

Build succeeded:

@bors bors bot merged commit 2f52aee into uuid-rs:master Apr 30, 2021
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4 participants