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use std::cell::RefCell;
use std::collections::HashMap;
use std::os::unix::net::{UnixListener, UnixStream};
use std::path::PathBuf;
use std::rc::Rc;
use std::{env, io, process};
use anyhow::Context;
use calloop::io::Async;
use directories::BaseDirs;
use futures_util::io::{AsyncReadExt, BufReader};
use futures_util::{AsyncBufReadExt, AsyncWriteExt};
use niri_ipc::{Request, Response};
use smithay::reexports::calloop::generic::Generic;
use smithay::reexports::calloop::{Interest, LoopHandle, Mode, PostAction};
use smithay::reexports::rustix::fs::unlink;
use crate::niri::State;
pub struct IpcServer {
pub socket_path: PathBuf,
}
struct ClientCtx {
event_loop: LoopHandle<'static, State>,
ipc_outputs: Rc<RefCell<HashMap<String, niri_ipc::Output>>>,
}
impl IpcServer {
pub fn start(
event_loop: &LoopHandle<'static, State>,
wayland_socket_name: &str,
) -> anyhow::Result<Self> {
let _span = tracy_client::span!("Ipc::start");
let socket_name = format!("niri.{wayland_socket_name}.{}.sock", process::id());
let mut socket_path = socket_dir();
socket_path.push(socket_name);
let listener = UnixListener::bind(&socket_path).context("error binding socket")?;
listener
.set_nonblocking(true)
.context("error setting socket to non-blocking")?;
let source = Generic::new(listener, Interest::READ, Mode::Level);
event_loop
.insert_source(source, |_, socket, state| {
match socket.accept() {
Ok((stream, _)) => on_new_ipc_client(state, stream),
Err(e) if e.kind() == io::ErrorKind::WouldBlock => (),
Err(e) => return Err(e),
}
Ok(PostAction::Continue)
})
.unwrap();
Ok(Self { socket_path })
}
}
impl Drop for IpcServer {
fn drop(&mut self) {
let _ = unlink(&self.socket_path);
}
}
fn socket_dir() -> PathBuf {
BaseDirs::new()
.as_ref()
.and_then(|x| x.runtime_dir())
.map(|x| x.to_owned())
.unwrap_or_else(env::temp_dir)
}
fn on_new_ipc_client(state: &mut State, stream: UnixStream) {
let _span = tracy_client::span!("on_new_ipc_client");
trace!("new IPC client connected");
let stream = match state.niri.event_loop.adapt_io(stream) {
Ok(stream) => stream,
Err(err) => {
warn!("error making IPC stream async: {err:?}");
return;
}
};
let ctx = ClientCtx {
event_loop: state.niri.event_loop.clone(),
ipc_outputs: state.backend.ipc_outputs(),
};
let future = async move {
if let Err(err) = handle_client(ctx, stream).await {
warn!("error handling IPC client: {err:?}");
}
};
if let Err(err) = state.niri.scheduler.schedule(future) {
warn!("error scheduling IPC stream future: {err:?}");
}
}
async fn handle_client(ctx: ClientCtx, stream: Async<'_, UnixStream>) -> anyhow::Result<()> {
let (read, mut write) = stream.split();
let mut buf = String::new();
// Read a single line to allow extensibility in the future to keep reading.
BufReader::new(read)
.read_line(&mut buf)
.await
.context("error reading request")?;
let reply = process(&ctx, &buf).map_err(|err| {
warn!("error processing IPC request: {err:?}");
err.to_string()
});
let buf = serde_json::to_vec(&reply).context("error formatting reply")?;
write.write_all(&buf).await.context("error writing reply")?;
Ok(())
}
fn process(ctx: &ClientCtx, buf: &str) -> anyhow::Result<Response> {
let request: Request = serde_json::from_str(buf).context("error parsing request")?;
let response = match request {
Request::Outputs => {
let ipc_outputs = ctx.ipc_outputs.borrow().clone();
Response::Outputs(ipc_outputs)
}
Request::Action(action) => {
let action = niri_config::Action::from(action);
ctx.event_loop.insert_idle(move |state| {
state.do_action(action);
});
Response::Handled
}
};
Ok(response)
}
|
