1 //! Handle process life-time and message passing for proc-macro client
4 convert::{TryFrom, TryInto},
5 ffi::{OsStr, OsString},
7 io::{self, BufRead, BufReader, Write},
9 process::{Child, ChildStdin, ChildStdout, Command, Stdio},
16 msg::{ErrorCode, Message, Request, Response, ResponseError},
17 rpc::{ListMacrosResult, ListMacrosTask, ProcMacroKind},
20 pub(crate) struct ProcMacroProcessSrv {
21 process: Mutex<Process>,
22 stdio: Mutex<(ChildStdin, BufReader<ChildStdout>)>,
25 impl fmt::Debug for ProcMacroProcessSrv {
26 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
27 f.debug_struct("ProcMacroProcessSrv").field("process", &self.process).finish()
31 impl ProcMacroProcessSrv {
33 process_path: PathBuf,
34 args: impl IntoIterator<Item = impl AsRef<OsStr>>,
35 ) -> io::Result<ProcMacroProcessSrv> {
36 let mut process = Process::run(process_path, args)?;
37 let (stdin, stdout) = process.stdio().expect("couldn't access child stdio");
39 let srv = ProcMacroProcessSrv {
40 process: Mutex::new(process),
41 stdio: Mutex::new((stdin, stdout)),
47 pub(crate) fn find_proc_macros(
50 ) -> Result<Vec<(String, ProcMacroKind)>, tt::ExpansionError> {
51 let task = ListMacrosTask { lib: dylib_path.to_path_buf() };
53 let result: ListMacrosResult = self.send_task(Request::ListMacro(task))?;
57 pub(crate) fn send_task<R>(&self, req: Request) -> Result<R, tt::ExpansionError>
59 R: TryFrom<Response, Error = &'static str>,
61 let mut guard = self.stdio.lock().unwrap_or_else(|e| e.into_inner());
62 let stdio = &mut *guard;
63 let (stdin, stdout) = (&mut stdio.0, &mut stdio.1);
65 let mut buf = String::new();
66 let res = match send_request(stdin, stdout, req, &mut buf) {
69 let mut process = self.process.lock().unwrap_or_else(|e| e.into_inner());
71 "proc macro server crashed, server process state: {:?}, server request error: {:?}",
72 process.child.try_wait(),
75 let res = Response::Error(ResponseError {
76 code: ErrorCode::ServerErrorEnd,
77 message: "proc macro server crashed".into(),
84 Some(Response::Error(err)) => Err(tt::ExpansionError::ExpansionError(err.message)),
85 Some(res) => Ok(res.try_into().map_err(|err| {
86 tt::ExpansionError::Unknown(format!("Fail to get response, reason : {:#?} ", err))
88 None => Err(tt::ExpansionError::Unknown("Empty result".into())),
101 args: impl IntoIterator<Item = impl AsRef<OsStr>>,
102 ) -> io::Result<Process> {
103 let args: Vec<OsString> = args.into_iter().map(|s| s.as_ref().into()).collect();
104 let child = JodChild(mk_child(&path, &args)?);
105 Ok(Process { child })
108 fn stdio(&mut self) -> Option<(ChildStdin, BufReader<ChildStdout>)> {
109 let stdin = self.child.stdin.take()?;
110 let stdout = self.child.stdout.take()?;
111 let read = BufReader::new(stdout);
117 fn mk_child(path: &Path, args: impl IntoIterator<Item = impl AsRef<OsStr>>) -> io::Result<Child> {
120 .stdin(Stdio::piped())
121 .stdout(Stdio::piped())
122 .stderr(Stdio::inherit())
127 mut writer: &mut impl Write,
128 mut reader: &mut impl BufRead,
131 ) -> io::Result<Option<Response>> {
132 req.write(&mut writer)?;
133 Response::read(&mut reader, buf)