This differential implements CommServicesAuthMetadataEmitter on Android in such a way that it callable from C++.
Details
Details
- Apply this patch: https://gist.github.com/marcinwasowicz/7f04bd592dd4a800adbc96b720e200b7. It creates js code to subscribe for auth metadata events and sends this event from C++ upon each draft update (contents of the event are just dummy strings).
- Build Android app.
- Ensure that each time you write one letter you can see console.log with dummy auth metadata in native yarn dev terminal.
Diff Detail
Diff Detail
- Repository
- rCOMM Comm
- Lint
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Same as for iOS diff:
React native requires that event emitter is an instance of a class. On the other hand in order to smoothly call this object from Rust we need static method. Therefore I decided to use Singleton pattern for Rust <-> C++ interop. Object that is available to for C++ and Rust is set when the first JS listener subscribes and is removed when the last listener unsubscribes. This way we ensure that Rust/C++ won't try to send event if value under sharedInstance might be invalid. All calls that access or mutate sharedInstance are synchronized on class level.
For this differential important files are: CommServicesAuthMetadataEmitter.cpp and CommServicesAuthMetadataEmitter.java. Other files are pure boilerplate necessary to expose module to JS.
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Reviewers can quickly and easily familiarise themselves with event emitter implementation on Android by reading the docs: https://reactnative.dev/docs/native-modules-android#sending-events-to-javascript