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//! Handle process life-time and message passing for proc-macro client
use crossbeam_channel::{bounded, Receiver, Sender};
use ra_tt::Subtree;
use crate::msg::{ErrorCode, Message, Request, Response, ResponseError};
use crate::rpc::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask, ProcMacroKind};
use io::{BufRead, BufReader};
use std::{
convert::{TryFrom, TryInto},
ffi::OsStr,
io::{self, Write},
path::{Path, PathBuf},
process::{Child, Command, Stdio},
sync::{Arc, Weak},
};
#[derive(Debug, Default)]
pub(crate) struct ProcMacroProcessSrv {
inner: Option<Weak<Sender<Task>>>,
}
#[derive(Debug)]
pub(crate) struct ProcMacroProcessThread {
// XXX: drop order is significant
sender: Arc<Sender<Task>>,
handle: jod_thread::JoinHandle<()>,
}
struct Task {
req: Request,
result_tx: Sender<Option<Response>>,
}
struct Process {
path: PathBuf,
child: Child,
}
impl Drop for Process {
fn drop(&mut self) {
let _ = self.child.kill();
}
}
impl Process {
fn run<I, S>(process_path: &Path, args: I) -> Result<Process, io::Error>
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
let child = Command::new(process_path.clone())
.args(args)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::null())
.spawn()?;
Ok(Process { path: process_path.into(), child })
}
fn restart(&mut self) -> Result<(), io::Error> {
let _ = self.child.kill();
self.child = Command::new(self.path.clone())
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::null())
.spawn()?;
Ok(())
}
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))
}
}
impl ProcMacroProcessSrv {
pub fn run<I, S>(
process_path: &Path,
args: I,
) -> Result<(ProcMacroProcessThread, ProcMacroProcessSrv), io::Error>
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
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: Some(Arc::downgrade(&task_tx)) };
let thread = ProcMacroProcessThread { handle, sender: task_tx };
Ok((thread, srv))
}
pub fn find_proc_macros(
&self,
dylib_path: &Path,
) -> Result<Vec<(String, ProcMacroKind)>, ra_tt::ExpansionError> {
let task = ListMacrosTask { lib: dylib_path.to_path_buf() };
let result: ListMacrosResult = self.send_task(Request::ListMacro(task))?;
Ok(result.macros)
}
pub fn custom_derive(
&self,
dylib_path: &Path,
subtree: &Subtree,
derive_name: &str,
) -> Result<Subtree, ra_tt::ExpansionError> {
let task = ExpansionTask {
macro_body: subtree.clone(),
macro_name: derive_name.to_string(),
attributes: None,
lib: dylib_path.to_path_buf(),
};
let result: ExpansionResult = self.send_task(Request::ExpansionMacro(task))?;
Ok(result.expansion)
}
pub fn send_task<R>(&self, req: Request) -> Result<R, ra_tt::ExpansionError>
where
R: TryFrom<Response, Error = &'static str>,
{
let sender = match &self.inner {
None => return Err(ra_tt::ExpansionError::Unknown("No sender is found.".to_string())),
Some(it) => it,
};
let (result_tx, result_rx) = bounded(0);
let sender = match sender.upgrade() {
None => {
return Err(ra_tt::ExpansionError::Unknown("Proc macro process is closed.".into()))
}
Some(it) => it,
};
sender.send(Task { req: req.into(), result_tx }).unwrap();
let res = result_rx
.recv()
.map_err(|_| ra_tt::ExpansionError::Unknown("Proc macro thread is closed.".into()))?;
match res {
Some(Response::Error(err)) => {
return Err(ra_tt::ExpansionError::ExpansionError(err.message));
}
Some(res) => Ok(res.try_into().map_err(|err| {
ra_tt::ExpansionError::Unknown(format!(
"Fail to get response, reason : {:#?} ",
err
))
})?),
None => Err(ra_tt::ExpansionError::Unknown("Empty result".into())),
}
}
}
fn client_loop(task_rx: Receiver<Task>, mut process: Process) {
let (mut stdin, mut stdout) = match process.stdio() {
None => return,
Some(it) => it,
};
for task in task_rx {
let Task { req, result_tx } = task;
match send_request(&mut stdin, &mut stdout, req) {
Ok(res) => result_tx.send(res).unwrap(),
Err(_err) => {
let res = Response::Error(ResponseError {
code: ErrorCode::ServerErrorEnd,
message: "Server closed".into(),
});
result_tx.send(res.into()).unwrap();
// Restart the process
if process.restart().is_err() {
break;
}
let stdio = match process.stdio() {
None => break,
Some(it) => it,
};
stdin = stdio.0;
stdout = stdio.1;
}
}
}
}
fn send_request(
mut writer: &mut impl Write,
mut reader: &mut impl BufRead,
req: Request,
) -> Result<Option<Response>, io::Error> {
req.write(&mut writer)?;
Ok(Response::read(&mut reader)?)
}
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