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Bug 1791851 - Add documentation for using uniffi on desktop r=bdk DONTBUILD

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Differential Revision: https://phabricator.services.mozilla.com/D162174
This commit is contained in:
Sammy Khamis 2022-11-16 21:27:31 +00:00
parent a726096176
commit 7c1951aff7
1 changed files with 29 additions and 13 deletions
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docs/writing-rust-code/uniffi.md
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@ -38,17 +38,33 @@ your project:
## Creating new bindings with UniFFI
You can see an example of this feature in use: [when application-services swapped the tabs js sync engine with rust](https://bugzilla.mozilla.org/show_bug.cgi?id=1791851)
Here's how you can create a new set of bindings using UniFFI:
- UniFFI your crate (if it isn't already):
1. UniFFI your crate (if it isn't already):
- [Create a UDL file to describe your interface](https://mozilla.github.io/uniffi-rs/udl_file_spec.html)
- [Set up your Rust crate to generate scaffolding](https://mozilla.github.io/uniffi-rs/tutorial/Rust_scaffolding.html)
- Add your crate as a Firefox dependency (if it isn't already)
- If the code will exist in the mozilla-central repo:
2. Add your crate as a Firefox dependency (if it isn't already)
- **If the code will exist in the mozilla-central repo:**
- Create a new directory for the Rust crate
- Edit `toolkit/library/rust/shared/Cargo.toml` and add a dependency to your library path
- If the code exists in an external repo:
- **If the code exists in an external repo:**
- Edit `toolkit/library/rust/shared/Cargo.toml` and add a dependency to your library URL
- Run `mach vendor rust` to vendor in your Rust code
- Generate bindings code for your crate
- TODO: create a system for this and document it here. I think we can do something like we do for the test
fixtures, where devs don't need to touch that many moz.build files.
3. Generate bindings code for your crate
- Add the path of your UDL (that you made in step 1) in `toolkit/components/uniffi-bindgen-gecko-js/mach_commands.py`
- Run `./mach uniffi generate`
- add your newly generated `Rust{udl-name}.jsm` file to `toolkit/components/uniffi-bindgen-gecko-js/components/moz.build`
- Then simply import your `jsm` module to the file you want to use it in and start using your APIs!
Example from tabs module:
``` js
XPCOMUtils.defineLazyModuleGetters(lazy, {
...
TabsStore: "resource://gre/modules/RustTabs.jsm",
});
...
this._rustStore = await lazy.TabsStore.init(path);
```