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|
use std::collections::{HashMap, HashSet};
use std::fs;
use std::path::PathBuf;
use std::process;
use std::str::FromStr;
use std::sync::{mpsc::Sender, Arc, Mutex};
use std::thread;
use std::time::{Duration, Instant};
use zellij_utils::{serde, zellij_tile};
use serde::{de::DeserializeOwned, Serialize};
use wasmer::{
imports, ChainableNamedResolver, Function, ImportObject, Instance, Module, Store, Value,
WasmerEnv,
};
use wasmer_wasi::{Pipe, WasiEnv, WasiState};
use zellij_tile::data::{Event, EventType, PluginIds};
use crate::{
panes::PaneId,
pty::PtyInstruction,
screen::ScreenInstruction,
thread_bus::{Bus, ThreadSenders},
};
use zellij_utils::errors::{ContextType, PluginContext};
#[derive(Clone, Debug)]
pub(crate) enum PluginInstruction {
Load(Sender<u32>, PathBuf),
Update(Option<u32>, Event), // Focused plugin / broadcast, event data
Render(Sender<String>, u32, usize, usize), // String buffer, plugin id, rows, cols
Unload(u32),
Exit,
}
impl From<&PluginInstruction> for PluginContext {
fn from(plugin_instruction: &PluginInstruction) -> Self {
match *plugin_instruction {
PluginInstruction::Load(..) => PluginContext::Load,
PluginInstruction::Update(..) => PluginContext::Update,
PluginInstruction::Render(..) => PluginContext::Render,
PluginInstruction::Unload(_) => PluginContext::Unload,
PluginInstruction::Exit => PluginContext::Exit,
}
}
}
#[derive(WasmerEnv, Clone)]
pub(crate) struct PluginEnv {
pub plugin_id: u32,
pub senders: ThreadSenders,
pub wasi_env: WasiEnv,
pub subscriptions: Arc<Mutex<HashSet<EventType>>>,
}
// Thread main --------------------------------------------------------------------------------------------------------
pub(crate) fn wasm_thread_main(bus: Bus<PluginInstruction>, store: Store, data_dir: PathBuf) {
let mut plugin_id = 0;
let mut plugin_map = HashMap::new();
loop {
let (event, mut err_ctx) = bus.recv().expect("failed to receive event on channel");
err_ctx.add_call(ContextType::Plugin((&event).into()));
match event {
PluginInstruction::Load(pid_tx, path) => {
let plugin_dir = data_dir.join("plugins/");
let wasm_bytes = fs::read(&path)
.or_else(|_| fs::read(&path.with_extension("wasm")))
.or_else(|_| fs::read(&plugin_dir.join(&path).with_extension("wasm")))
.unwrap_or_else(|_| panic!("cannot find plugin {}", &path.display()));
// FIXME: Cache this compiled module on disk. I could use `(de)serialize_to_file()` for that
let module = Module::new(&store, &wasm_bytes).unwrap();
let output = Pipe::new();
let input = Pipe::new();
let mut wasi_env = WasiState::new("Zellij")
.env("CLICOLOR_FORCE", "1")
.preopen(|p| {
p.directory(".") // FIXME: Change this to a more meaningful dir
.alias(".")
.read(true)
.write(true)
.create(true)
})
.unwrap()
.stdin(Box::new(input))
.stdout(Box::new(output))
.finalize()
.unwrap();
let wasi = wasi_env.import_object(&module).unwrap();
let plugin_env = PluginEnv {
plugin_id,
senders: bus.senders.clone(),
wasi_env,
subscriptions: Arc::new(Mutex::new(HashSet::new())),
};
let zellij = zellij_exports(&store, &plugin_env);
let instance = Instance::new(&module, &zellij.chain_back(wasi)).unwrap();
let start = instance.exports.get_function("_start").unwrap();
// This eventually calls the `.load()` method
start.call(&[]).unwrap();
plugin_map.insert(plugin_id, (instance, plugin_env));
pid_tx.send(plugin_id).unwrap();
plugin_id += 1;
}
PluginInstruction::Update(pid, event) => {
for (&i, (instance, plugin_env)) in &plugin_map {
let subs = plugin_env.subscriptions.lock().unwrap();
// FIXME: This is very janky... Maybe I should write my own macro for Event -> EventType?
let event_type = EventType::from_str(&event.to_string()).unwrap();
if (pid.is_none() || pid == Some(i)) && subs.contains(&event_type) {
let update = instance.exports.get_function("update").unwrap();
wasi_write_object(&plugin_env.wasi_env, &event);
update.call(&[]).unwrap();
}
}
drop(bus.senders.send_to_screen(ScreenInstruction::Render));
}
PluginInstruction::Render(buf_tx, pid, rows, cols) => {
let (instance, plugin_env) = plugin_map.get(&pid).unwrap();
let render = instance.exports.get_function("render").unwrap();
render
.call(&[Value::I32(rows as i32), Value::I32(cols as i32)])
.unwrap();
buf_tx.send(wasi_read_string(&plugin_env.wasi_env)).unwrap();
}
PluginInstruction::Unload(pid) => drop(plugin_map.remove(&pid)),
Plugin
|
