mirror of
https://github.com/vector-im/element-android.git
synced 2024-11-22 14:38:15 +08:00
64 lines
3.0 KiB
Markdown
64 lines
3.0 KiB
Markdown
## Overview
|
|
|
|
Until the final migration to [rust crypto sdk](https://github.com/matrix-org/matrix-rust-components-kotlin), the Element Android project will support two
|
|
different SDK as a product flavor.
|
|
|
|
The `matrix-sdk-android` module is defining a new flavor dimension `crypto`, with two flavors `kotlinCrypto` and `rustCrypto`.
|
|
The crypto module cannot be changed at runtime, it's a build time configuration. The app supports migration from kotlinCrypto to rustCrypto but not the other
|
|
way around.
|
|
|
|
The code that is not shared between the flavors is located in dedicated source sets (`src/kotlinCrypto/`, `src/rustCrypto/`). Some tests are also extracted
|
|
in different source sets because they were accessing internal API and won't work with the rust crypto sdk.
|
|
|
|
## Noticeable changes
|
|
|
|
As a general rule, if you stick to the `kotlinCrypto` the app should behave as it was before the integration of favours.
|
|
There is a noticeable exception though:
|
|
In order to integrate the rust crypto several APIs had to be migrated from callback code to suspendable code. This change
|
|
impacted a lot the key verification engine (user and device verification), so this part has been refactored for `kotlinCrypto`. The UI is also impacted,
|
|
the verification flows now match the web experience.
|
|
|
|
TLDR; Verification UI and engine has been refactored.
|
|
|
|
## Testing with a local rust aar
|
|
|
|
In order to run a custom rust SDK branch you can follow the direction in the [bindings repository](https://github.com/matrix-org/matrix-rust-components-kotlin)
|
|
in order to build the `matrix-rust-sdk-crypto.aar`.
|
|
|
|
Copy this lib in `library/rustCrypto/`, and rename it `matrix-rust-sdk-crypto.aar`.
|
|
|
|
Then go to `matrix-sdk-android/build.gradle` and toggle the comments between the following lines.
|
|
|
|
````
|
|
rustCryptoImplementation("org.matrix.rustcomponents:crypto-android:0.3.1")
|
|
// rustCryptoApi project(":library:rustCrypto")
|
|
````
|
|
|
|
## Changes in CI
|
|
|
|
The workflow files have been updated to use the `kotlinCrypto` flavor, e.g
|
|
|
|
`assembleGplayNightly` => `assembleGplayKotlinCryptoNightly`
|
|
|
|
So building the unsigned release kotlin crypto apk is now:
|
|
|
|
`> ./gradlew assembleGplayKotlinCryptoRelease`
|
|
|
|
An additional workflow has been added to build the `rustCrypto` flavor (elementr.yml, ` Build debug APKs ER`).
|
|
|
|
|
|
## Database migration from kotlin to rust
|
|
|
|
With the kotlin flavor, the crypto information are persisted in the crypto realm database.
|
|
With the rust flavor, the crypto information are in a sqllite database.
|
|
|
|
The migration is handled when injecting `@SessionRustFilesDirectory` in the olmMachine.
|
|
When launching the first time after migration, the app will detect that there is no rust data repository and it will
|
|
create one. If there is an existing realm database, the data will then migrated to rust. See `ExtractMigrationDataUseCase`.
|
|
This will extract your device keys, account secrets, active olm and megolm sessions.
|
|
|
|
There is no inverse migration for now, as there is not yet rust pickle to olm pickle support in the sdk.
|
|
|
|
If you migrate your app to rust, and want to revert to kotlin you have to logout then login again.
|
|
|