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+14

Cargo.toml

··· 1 1 + [package] 2 2 + name = "rustin" 3 3 + version = "0.1.0" 4 4 + edition = "2024" 5 5 + 6 6 + [dependencies] 7 7 + anyhow = "1.0.99" 8 8 + plugin_api = { path = "api" } 9 9 + libloading = "0.8.8" 10 10 + serde = "1.0.219" 11 11 + serde_derive = "1.0.219" 12 12 + toml = "0.9.5" 13 13 + zip = "4.3.0" 14 14 + tempfile = "3.20.0"

+11

README.md

··· 1 1 + # rustin 2 2 + 3 3 + Super basic rust plugin system based on dynamic library loading that I made in an hour. 4 4 + 5 5 + This will probably require cross compilation. The easiest way to do this properly is Github CI, tbh. 6 6 + Looking for a better way, but it's hard to find one, mostly because of macOS. Windows and Linux are 7 7 + both super easy, but macOS is probably CI-only for most developers. 8 8 + 9 9 + ## Usage 10 10 + 11 11 + Run `make plugin` inside of `plugin`, then `cargo run` in the root. It should print `Hello, everyone!` or similar.

+9

api/Cargo.toml

··· 1 1 + [package] 2 2 + name = "plugin_api" 3 3 + version = "0.1.0" 4 4 + edition = "2024" 5 5 + 6 6 + [lib] 7 7 + crate-type = ["rlib", "cdylib"] 8 8 + 9 9 + [dependencies]

+17

api/src/lib.rs

··· 1 1 + pub trait Plugin { 2 2 + fn load(&self); 3 3 + } 4 4 + 5 5 + pub fn say_hello(name: String) { 6 6 + println!("Hello, {name}!"); 7 7 + } 8 8 + 9 9 + #[macro_export] 10 10 + macro_rules! plugin { 11 11 + ($plugin:tt) => { 12 12 + #[unsafe(no_mangle)] 13 13 + pub unsafe extern "Rust" fn provide_plugin() -> Box<dyn plugin_api::Plugin> { 14 14 + Box::new($plugin) 15 15 + } 16 16 + }; 17 17 + }

+14

plugin/Cargo.lock

··· 1 1 + # This file is automatically @generated by Cargo. 2 2 + # It is not intended for manual editing. 3 3 + version = 4 4 4 + 5 5 + [[package]] 6 6 + name = "plugin" 7 7 + version = "0.1.0" 8 8 + dependencies = [ 9 9 + "plugin_api", 10 10 + ] 11 11 + 12 12 + [[package]] 13 13 + name = "plugin_api" 14 14 + version = "0.1.0"

+10

plugin/Cargo.toml

··· 1 1 + [package] 2 2 + name = "plugin" 3 3 + version = "0.1.0" 4 4 + edition = "2024" 5 5 + 6 6 + [lib] 7 7 + crate-type = ["cdylib"] 8 8 + 9 9 + [dependencies] 10 10 + plugin_api = { path = "../api" }

+6

plugin/Makefile

··· 1 1 + plugin: 2 2 + cargo build 3 3 + cp target/debug/libplugin.so plugin.so 4 4 + mkdir -p ../plugins 5 5 + zip ../plugins/test.rstn plugin.so plugin.toml 6 6 + rm plugin.so

+2

plugin/plugin.toml

··· 1 1 + name = "test" 2 2 + version = "0"

+11

plugin/src/lib.rs

··· 1 1 + use plugin_api::{Plugin, plugin, say_hello}; 2 2 + 3 3 + pub struct HelloWorld; 4 4 + 5 5 + impl Plugin for HelloWorld { 6 6 + fn load(&self) { 7 7 + say_hello("everyone".to_string()); 8 8 + } 9 9 + } 10 10 + 11 11 + plugin!(HelloWorld);

+53

src/lib.rs

··· 1 1 + #![feature(iterator_try_collect)] 2 2 + 3 3 + use anyhow::{Context, Result}; 4 4 + use std::{ 5 5 + fs::{self, File}, 6 6 + path::PathBuf, 7 7 + }; 8 8 + use zip::ZipArchive; 9 9 + 10 10 + use crate::meta::PluginMeta; 11 11 + 12 12 + pub mod loader; 13 13 + pub mod meta; 14 14 + 15 15 + #[derive(Debug)] 16 16 + pub struct LocatedPlugin { 17 17 + pub meta: PluginMeta, 18 18 + pub zip: ZipArchive<File>, 19 19 + pub so: bool, 20 20 + pub dll: bool, 21 21 + pub dylib: bool, 22 22 + } 23 23 + 24 24 + pub fn locate_plugins(dir: PathBuf) -> Result<Vec<LocatedPlugin>> { 25 25 + let mut plugins = Vec::new(); 26 26 + 27 27 + for entry in fs::read_dir(dir).context("failed reading directory")? { 28 28 + let entry = entry.context("failed opening directory entry")?; 29 29 + if entry.path().is_dir() { 30 30 + continue; 31 31 + } 32 32 + if entry.path().extension().is_none_or(|ext| ext != "rstn") { 33 33 + continue; 34 34 + } 35 35 + 36 36 + let mut zip = ZipArchive::new(File::open(entry.path()).context("failed opening file")?) 37 37 + .context("failed reading zip")?; 38 38 + let meta = meta::read(&mut zip)?; 39 39 + let so = zip.by_name("plugin.so").is_ok(); 40 40 + let dll = zip.by_name("plugin.dll").is_ok(); 41 41 + let dylib = zip.by_name("plugin.dylib").is_ok(); 42 42 + 43 43 + plugins.push(LocatedPlugin { 44 44 + meta, 45 45 + zip, 46 46 + so, 47 47 + dll, 48 48 + dylib, 49 49 + }); 50 50 + } 51 51 + 52 52 + Ok(plugins) 53 53 + }

+62

src/loader.rs

··· 1 1 + use std::io; 2 2 + 3 3 + use anyhow::{Context, Result, bail}; 4 4 + use libloading::Library; 5 5 + use plugin_api::Plugin; 6 6 + use tempfile::NamedTempFile; 7 7 + 8 8 + use crate::LocatedPlugin; 9 9 + 10 10 + pub struct LoadedPlugin { 11 11 + pub located: LocatedPlugin, 12 12 + pub plugin: Box<dyn Plugin>, 13 13 + // DO NOT MOVE THIS UP! 14 14 + // This is due to rust's dropping order! 15 15 + // If the library gets dropped (unloaded) before the plugin, a segfault will occur. 16 16 + pub lib: Library, 17 17 + } 18 18 + 19 19 + pub fn load(mut plugin: LocatedPlugin) -> Result<LoadedPlugin> { 20 20 + #[cfg(target_os = "linux")] 21 21 + let cdylib = plugin.so; 22 22 + 23 23 + #[cfg(target_os = "windows")] 24 24 + let cdylib = plugin.dll; 25 25 + 26 26 + #[cfg(target_os = "macos")] 27 27 + let cdylib = plugin.dylib; 28 28 + 29 29 + if !cdylib { 30 30 + bail!("unsupported platform"); 31 31 + } 32 32 + 33 33 + #[cfg(target_os = "linux")] 34 34 + let cdylib = "plugin.so"; 35 35 + 36 36 + #[cfg(target_os = "windows")] 37 37 + let cdylib = "plugin.dll"; 38 38 + 39 39 + #[cfg(target_os = "macos")] 40 40 + let cdylib = "plugin.dylib"; 41 41 + 42 42 + let mut tmp = NamedTempFile::new().context("failed creating temp file")?; 43 43 + { 44 44 + let mut entry = plugin.zip.by_name(cdylib).unwrap(); 45 45 + io::copy(&mut entry, &mut tmp).context("failed copying cdylib to temp file")?; 46 46 + } 47 47 + 48 48 + unsafe { 49 49 + let lib = 50 50 + Library::new(tmp.path().display().to_string()).context("failed loading library")?; 51 51 + let ctor = lib 52 52 + .get::<unsafe extern "Rust" fn() -> Box<dyn Plugin>>(b"provide_plugin") 53 53 + .context("plugin does not have a provide_plugin function")?; 54 54 + let instance = ctor(); 55 55 + 56 56 + Ok(LoadedPlugin { 57 57 + located: plugin, 58 58 + lib, 59 59 + plugin: instance, 60 60 + }) 61 61 + } 62 62 + }

+14

src/main.rs

··· 1 1 + use std::path::PathBuf; 2 2 + 3 3 + use rustin::{loader, locate_plugins}; 4 4 + 5 5 + fn main() -> anyhow::Result<()> { 6 6 + let plugins = locate_plugins(PathBuf::from("plugins"))?; 7 7 + for plugin in plugins { 8 8 + println!("Found plugin {}, v{}", plugin.meta.name.clone(), plugin.meta.version.clone()); 9 9 + let plugin = loader::load(plugin)?; 10 10 + (*plugin.plugin).load(); 11 11 + } 12 12 + 13 13 + Ok(()) 14 14 + }

+17

src/meta.rs

··· 1 1 + use std::io::{Read, Seek}; 2 2 + 3 3 + use anyhow::*; 4 4 + use serde_derive::{Deserialize, Serialize}; 5 5 + use zip::read::ZipArchive; 6 6 + 7 7 + #[derive(Clone, Debug, Serialize, Deserialize)] 8 8 + pub struct PluginMeta { 9 9 + pub name: String, 10 10 + pub version: String, 11 11 + } 12 12 + 13 13 + pub fn read<R: Read + Seek>(zip: &mut ZipArchive<R>) -> Result<PluginMeta> { 14 14 + let file = zip.by_name("plugin.toml").context("missing plugin.toml")?; 15 15 + let bytes = file.bytes().try_collect::<Vec<u8>>().context("bad bytes")?; 16 16 + Ok(toml::from_slice::<PluginMeta>(&bytes).context("invalid plugin.toml")?) 17 17 + }