226 lines
11 KiB
Markdown
226 lines
11 KiB
Markdown
# napi-rs
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> This project was initialized from [xray](https://github.com/atom/xray)
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A framework for building compiled `Node.js` add-ons in `Rust` via Node-API. Website: https://napi.rs
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<p>
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<a href="https://discord.gg/SpWzYHsKHs">
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<img src="https://img.shields.io/discord/874290842444111882.svg?logo=discord&style=flat-square"
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alt="chat" />
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</a>
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<a href="https://docs.rs/crate/napi"><img src="https://docs.rs/napi/badge.svg"></img></a>
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<a href="https://crates.io/crates/napi"><img src="https://img.shields.io/crates/v/napi.svg"></img></a>
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<a href="https://www.npmjs.com/package/@napi-rs/cli"><img src="https://img.shields.io/npm/v/@napi-rs/cli.svg"></img></a>
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<a href="https://stakes.social/0x2C9F5c3ebC01A45D34198229E60eE186eCDc5C5E"><img src="https://badge.devprotocol.xyz/0x2C9F5c3ebC01A45D34198229E60eE186eCDc5C5E/descriptive" alt="Stake to support us"></img></a>
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</p>
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## Platform Support
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[](https://github.com/napi-rs/napi-rs/actions/workflows/android-armv7.yml)
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[](https://github.com/napi-rs/napi-rs/actions/workflows/windows-arm.yml)
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[](https://cirrus-ci.com/github/napi-rs/napi-rs?branch=main)
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## MSRV
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**Rust** `1.57.0`
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| | node12 | node14 | node16 | node18 |
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| --------------------- | ------ | ------ | ------ | ------ |
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| Windows x64 | ✓ | ✓ | ✓ | ✓ |
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| Windows x86 | ✓ | ✓ | ✓ | ✓ |
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| Windows arm64 | ✓ | ✓ | ✓ | ✓ |
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| macOS x64 | ✓ | ✓ | ✓ | ✓ |
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| macOS aarch64 | ✓ | ✓ | ✓ | ✓ |
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| Linux x64 gnu | ✓ | ✓ | ✓ | ✓ |
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| Linux x64 musl | ✓ | ✓ | ✓ | ✓ |
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| Linux aarch64 gnu | ✓ | ✓ | ✓ | ✓ |
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| Linux aarch64 musl | ✓ | ✓ | ✓ | ✓ |
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| Linux arm gnueabihf | ✓ | ✓ | ✓ | ✓ |
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| Linux aarch64 android | ✓ | ✓ | ✓ | ✓ |
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| Linux armv7 android | ✓ | ✓ | ✓ | ✓ |
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| FreeBSD x64 | ✓ | ✓ | ✓ | ✓ |
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This library depends on Node-API and requires `Node@10.0.0` or later.
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We already have some packages written by `napi-rs`: [node-rs](https://github.com/napi-rs/node-rs)
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One nice feature is that this crate allows you to build add-ons purely with the `Rust/JavaScript` toolchain and without involving `node-gyp`.
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## Taste
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> You can start from [package-template](https://github.com/napi-rs/package-template) to play with `napi-rs`
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### Define JavaScript functions
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```rust
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/// import the preludes
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use napi::bindgen_prelude::*;
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use napi_derive::napi;
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/// module registration is done by the runtime, no need to explicitly do it now.
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#[napi]
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fn fibonacci(n: u32) -> u32 {
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match n {
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1 | 2 => 1,
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_ => fibonacci(n - 1) + fibonacci(n - 2),
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}
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}
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/// use `Fn`, `FnMut` or `FnOnce` traits to defined JavaScript callbacks
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/// the return type of callbacks can only be `Result`.
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#[napi]
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fn get_cwd<T: Fn(String) -> Result<()>>(callback: T) {
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callback(env::current_dir().unwrap().to_string_lossy().to_string()).unwrap();
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}
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/// or, define the callback signature in where clause
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#[napi]
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fn test_callback<T>(callback: T)
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where T: Fn(String) -> Result<()>
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{}
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/// async fn, require `async` feature enabled.
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/// [dependencies]
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/// napi = {version="2", features=["async"]}
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#[napi]
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async fn read_file_async(path: String) -> Result<Buffer> {
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tokio::fs::read(path)
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.map(|r| match r {
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Ok(content) => Ok(content.into()),
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Err(e) => Err(Error::new(
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Status::GenericFailure,
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format!("failed to read file, {}", e),
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)),
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})
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.await
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}
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```
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more examples at [examples](./examples/napi)
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## Building
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This repository is a `Cargo` crate. Any napi-based add-on should contain `Cargo.toml` to make it a Cargo crate.
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In your `Cargo.toml` you need to set the `crate-type` to `"cdylib"` so that cargo builds a C-style shared library that can be dynamically loaded by the Node executable. You'll also need to add this crate as a dependency.
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```toml
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[package]
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name = "awesome"
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[lib]
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crate-type = ["cdylib"]
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[dependencies]
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napi = "2"
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napi-derive = "2"
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[build-dependencies]
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napi-build = "1"
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```
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And create `build.rs` in your own project:
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```rust
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// build.rs
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extern crate napi_build;
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fn main() {
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napi_build::setup();
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}
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```
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So far, the `napi` build script has only been tested on `macOS` `Linux` `Windows x64 MSVC` and `FreeBSD`.
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Install the `@napi-rs/cli` to help you build your `Rust` codes and copy `Dynamic lib` file to `.node` file in case you can `require` it in your program.
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```js
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{
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"package": "awesome-package",
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"devDependencies": {
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"@napi-rs/cli": "^1.0.0"
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},
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"napi": {
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"name": "jarvis" // <----------- Config the name of native addon, or the napi command will use the name of `Cargo.toml` for the binary file name.
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},
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"scripts": {
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"build": "napi build --release",
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"build:debug": "napi build"
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}
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}
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```
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Then you can require your native binding:
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```js
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require('./jarvis.node')
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```
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The `module_name` would be your `package` name in your `Cargo.toml`.
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`xxx => ./xxx.node`
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`xxx-yyy => ./xxx_yyy.node`
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You can also copy `Dynamic lib` file to an appointed location:
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```bash
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napi build [--release] ./dll
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napi build [--release] ./artifacts
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```
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There are [documents](./cli) which contains more details about the `@napi-rs/cli` usage.
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## Testing
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Because libraries that depend on this crate must be loaded into a Node executable in order to resolve symbols, all tests are written in JavaScript in the `test_module` subdirectory.
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To run tests:
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```sh
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yarn build:test
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yarn test
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```
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## Related projects
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- [neon](https://www.neon-bindings.com)
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- [node-bindgen](https://github.com/infinyon/node-bindgen)
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## Features table
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| Rust Type | Node Type | [NAPI Version](https://nodejs.org/api/n-api.html#n_api_node_api_version_matrix) | Minimal Node version | Enable by `napi` feature |
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| ------------------------ | ------------------- | ------------------------------------------------------------------------------- | -------------------- | ------------------------ |
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| u32 | Number | 1 | v8.0.0 |
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| i32/i64 | Number | 1 | v8.0.0 |
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| f64 | Number | 1 | v8.0.0 |
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| bool | Boolean | 1 | v8.0.0 |
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| String/&'a str | String | 1 | v8.0.0 |
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| Latin1String | String | 1 | v8.0.0 | latin1 |
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| UTF16String | String | 1 | v8.0.0 |
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| Object | Object | 1 | v8.0.0 |
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| serde_json::Map | Object | 1 | v8.0.0 | serde-json |
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| serde_json::Value | any | 1 | v8.0.0 | serde-json |
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| Array | Array<any> | 1 | v8.0.0 |
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| Vec<T> | Array<T> | 1 | v8.0.0 |
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| Buffer | Buffer | 1 | v8.0.0 |
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| External<T> | External<T> | 1 | v8.0.0 | |
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| Null | null | 1 | v8.0.0 |
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| Undefined/() | undefined | 1 | v8.0.0 |
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| Result<()> | Error | 1 | v8.0.0 |
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| T: Fn(...) -> Result<T> | Function | 1 | v8.0.0 |
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| Async/Future | Promise<T> | 4 | v10.6.0 | async |
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| AsyncTask | Promise<T> | 1 | v8.5.0 |
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| JsGlobal | global | 1 | v8.0.0 |
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| JsSymbol | Symbol | 1 | v8.0.0 |
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| Int8Array/Uint8Array ... | TypedArray | 1 | v8.0.0 |
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| JsFunction | threadsafe function | 4 | v10.6.0 | napi4 |
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| BigInt | BigInt | 6 | v10.7.0 | napi6 |
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