Kayos
7ff5ac79e5
NewPipeExtractor (Java) → strawcore (Rust) migration begins. Phase U:
- U-1: Rust toolchain + UniFFI smoke test
- U-2: rustypipe search via uniffi suspend fun, SearchViewModel swapped
What landed:
- rust/strawcore — UniFFI-exported Rust crate using proc-macros.
Builds for arm64-v8a + armeabi-v7a + x86 + x86_64 via cargo-ndk.
Tokio multi-thread runtime singleton drives rustypipe's async API.
- strawApp/build.gradle.kts — cargoBuildHost + cargoBuild + uniffiBindgen
Gradle Exec tasks chained into the Android build. Generated Kotlin
bindings land in src/main/java/uniffi/strawcore/ (gitignored).
- SearchViewModel.kt — calls uniffi.strawcore.search(query) directly.
NewPipeExtractor still in deps for VideoDetail/Player/Channel paths;
those move to Rust in U-3 / U-4.
- Build chain quirks beat:
* cargo absolute path in Exec tasks (PATH wasn't propagating)
* uniffi-bindgen needs UNSTRIPPED host .so — separate cargoBuildHost
builds a debug-profile host lib to read metadata from
* rustypipe rustls-tls-webpki-roots avoids the openssl-sys
cross-compile tarpit
* rquickjs-sys 'bindgen' feature opted in (no prebuilt Android
bindings ship; crafting-table has libclang 14)
- crafting-table runtime install (until Dockerfile catches up):
rustup + 4 Android targets + cargo-ndk + NDK r27c. Persists in
/caches/cargo + /caches/android-sdk via the volume mount.
APK size: 22MB (U-1) → 37MB (U-2). libstrawcore.so 3-5MB per ABI carries
rustypipe + reqwest + tokio + rustls + rquickjs. NewPipeExtractor still
in for now (still drives detail + player + channel + feed), so the
Java half is doubled up. U-5 removes it.
56 lines
2.6 KiB
Markdown
56 lines
2.6 KiB
Markdown
# `rust/` — strawcore: Rust YouTube core for Straw
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Phase **U-** of the Straw build. Goal: replace the Java NewPipeExtractor
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dependency with a Rust core (rustypipe + tokio + reqwest), exposed to the
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Kotlin/Compose UI via [UniFFI](https://mozilla.github.io/uniffi-rs/).
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Compose UI stays in Kotlin — only the YouTube/Innertube fetching layer
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moves to Rust.
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## Phases
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| Phase | What |
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| **U-1** | Toolchain + UniFFI smoke test (`hello_from_rust`) round-tripping through JNA. No real APIs yet. |
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| **U-2** | rustypipe search. `SearchViewModel` calls the Rust core. |
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| **U-3** | rustypipe streamInfo + streams. `VideoDetailViewModel` + `PlayerViewModel` use it. |
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| **U-4** | rustypipe channel + tabs. `ChannelViewModel` + `SubscriptionFeedViewModel`. |
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| **U-5** | Rip NewPipeExtractor Java dep. Measure APK + cold-fetch latency before/after. |
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| **U-6** *(stretch)* | SponsorBlock + RYD HTTP through reqwest + tokio in the same lib. |
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## Build chain
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```
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crafting-table
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├── rustup stable (target add: aarch64-linux-android, armv7-linux-androideabi,
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│ x86_64-linux-android, i686-linux-android)
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├── cargo-ndk (cross-compile helper)
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├── android-sdk (ANDROID_HOME, sdkmanager, build-tools, platforms)
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└── android-ndk (ANDROID_NDK_HOME, r27c LTS at /caches/android-sdk/ndk/...)
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Gradle (strawApp/build.gradle.kts)
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├── cargoBuild Exec task → cargo ndk -t <abi>... -o jniLibs/ build --release
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├── uniffiBindgen Exec task → cargo run --bin uniffi-bindgen ... --library libstrawcore.so
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└── source-set wiring generated Kotlin lands in strawApp/src/main/java/uniffi/strawcore/
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Runtime (StrawApp.onCreate)
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├── System.loadLibrary("strawcore")
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└── uniffi.strawcore.initLogging()
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```
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## Why UniFFI (and not raw JNI / JNA bindings)
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- Hand-written JNI: tedious, error-prone, every type change is two files
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(Kotlin + Rust) that must stay in sync.
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- Raw JNA: better, but you still hand-write the Kotlin side and worry about
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string ownership.
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- UniFFI: write Rust, annotate with `#[uniffi::export]`, get a Kotlin shim
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generated. Strings, structs, enums, Result types, `async` functions all
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cross the boundary transparently. The runtime is JNA under the hood.
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## When in doubt
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- `cargo check -p strawcore --target aarch64-linux-android` — fast iteration.
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- `cargo run --bin uniffi-bindgen -- generate ...` — regenerate Kotlin bindings.
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- `adb logcat -s strawcore` — Rust `log::info!()` lands here.
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- `aapt dump badging strawApp/build/outputs/apk/debug/strawApp-debug.apk` —
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inspect what ABIs/native-libs the APK carries.
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