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//! Handle process life-time and message passing for proc-macro client
use std::{
convert::{TryFrom, TryInto},
ffi::{OsStr, OsString},
io::{self, BufRead, BufReader, Write},
path::{Path, PathBuf},
process::{Child, Command, Stdio},
sync::{Arc, Weak},
};
use crossbeam_channel::{bounded, Receiver, Sender};
use crate::{
msg::{ErrorCode, Message, Request, Response, ResponseError},
rpc::{ListMacrosResult, ListMacrosTask, ProcMacroKind},
};
#[derive(Debug, Default)]
pub(crate) struct ProcMacroProcessSrv {
inner: Weak<Sender<Task>>,
}
#[derive(Debug)]
pub(crate) struct ProcMacroProcessThread {
// XXX: drop order is significant
sender: Arc<Sender<Task>>,
handle: jod_thread::JoinHandle<()>,
}
impl ProcMacroProcessSrv {
pub(crate) fn run(
process_path: PathBuf,
args: impl IntoIterator<Item = impl AsRef<OsStr>>,
) -> io::Result<(ProcMacroProcessThread, ProcMacroProcessSrv)> {
let process = Process::run(process_path, args)?;
let (task_tx, task_rx) = bounded(0);
let handle = jod_thread::spawn(move || {
client_loop(task_rx, process);
});
let task_tx = Arc::new(task_tx);
let srv = ProcMacroProcessSrv { inner: Arc::downgrade(&task_tx) };
let thread = ProcMacroProcessThread { handle, sender: task_tx };
Ok((thread, srv))
}
pub(crate) fn find_proc_macros(
&self,
dylib_path: &Path,
) -> Result<Vec<(String, ProcMacroKind)>, tt::ExpansionError> {
let task = ListMacrosTask { lib: dylib_path.to_path_buf() };
let result: ListMacrosResult = self.send_task(Request::ListMacro(task))?;
Ok(result.macros)
}
pub(crate) fn send_task<R>(&self, req: Request) -> Result<R, tt::ExpansionError>
where
R: TryFrom<Response, Error = &'static str>,
{
let (result_tx, result_rx) = bounded(0);
let sender = match self.inner.upgrade() {
None => return Err(tt::ExpansionError::Unknown("proc macro process is closed".into())),
Some(it) => it,
};
sender
.send(Task { req, result_tx })
.map_err(|_| tt::ExpansionError::Unknown("proc macro server crashed".into()))?;
let res = result_rx
.recv()
.map_err(|_| tt::ExpansionError::Unknown("proc macro server crashed".into()))?;
match res {
Some(Response::Error(err)) => {
return Err(tt::ExpansionError::ExpansionError(err.message));
}
Some(res) => Ok(res.try_into().map_err(|err| {
tt::ExpansionError::Unknown(format!("Fail to get response, reason : {:#?} ", err))
})?),
None => Err(tt::ExpansionError::Unknown("Empty result".into())),
}
}
}
fn client_loop(task_rx: Receiver<Task>, mut process: Process) {
let (mut stdin, mut stdout) = process.stdio().expect("couldn't access child stdio");
for Task { req, result_tx } in task_rx {
match send_request(&mut stdin, &mut stdout, req) {
Ok(res) => result_tx.send(res).unwrap(),
Err(_err) => {
log::error!(
"proc macro server crashed, server process state: {:?}",
process.child.try_wait()
);
let res = Response::Error(ResponseError {
code: ErrorCode::ServerErrorEnd,
message: "proc macro server crashed".into(),
});
result_tx.send(res.into()).unwrap();
// Exit the thread.
break;
}
}
}
}
struct Task {
req: Request,
result_tx: Sender<Option<Response>>,
}
struct Process {
child: Child,
}
impl Drop for Process {
fn drop(&mut self) {
let _ = self.child.kill();
}
}
impl Process {
fn run(
path: PathBuf,
args: impl IntoIterator<Item = impl AsRef<OsStr>>,
) -> io::Result<Process> {
let args: Vec<OsString> = args.into_iter().map(|s| s.as_ref().into()).collect();
let child = mk_child(&path, &args)?;
Ok(Process { child })
}
fn stdio(&mut self) -> Option<(impl Write, impl BufRead)> {
let stdin = self.child.stdin.take()?;
let stdout = self.child.stdout.take()?;
let read = BufReader::new(stdout);
Some((stdin, read))
}
}
fn mk_child(path: &Path, args: impl IntoIterator<Item = impl AsRef<OsStr>>) -> io::Result<Child> {
Command::new(&path)
.args(args)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::inherit())
.spawn()
}
fn send_request(
mut writer: &mut impl Write,
mut reader: &mut impl BufRead,
req: Request,
) -> io::Result<Option<Response>> {
req.write(&mut writer)?;
Ok(Response::read(&mut reader)?)
}
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