# HG changeset patch # User Yuya Nishihara # Date 1538824244 -32400 # Node ID bb936e25a84a1bf197fa833a4666e19eac138321 # Parent cf144f50f413d99987f8ee5679e283383085be7b rust-chg: spawn server process if not running This is the minimal reimplementation of gethgcmd(), execcmdserver(), retryconnectcmdserver(), and connectcmdserver() in chg.c. No config validation is implemented yet. And some Py3 workarounds would be missing as this is the code I wrote in 2018. Differential Revision: https://phab.mercurial-scm.org/D8360 diff -r cf144f50f413 -r bb936e25a84a rust/chg/src/lib.rs --- a/rust/chg/src/lib.rs Tue Mar 31 23:13:13 2020 +0900 +++ b/rust/chg/src/lib.rs Sat Oct 06 20:10:44 2018 +0900 @@ -7,9 +7,12 @@ #[macro_use] extern crate futures; extern crate libc; +#[macro_use] +extern crate log; extern crate tokio; extern crate tokio_hglib; extern crate tokio_process; +extern crate tokio_timer; mod attachio; mod clientext; diff -r cf144f50f413 -r bb936e25a84a rust/chg/src/locator.rs --- a/rust/chg/src/locator.rs Tue Mar 31 23:13:13 2020 +0900 +++ b/rust/chg/src/locator.rs Sat Oct 06 20:10:44 2018 +0900 @@ -5,6 +5,7 @@ //! Utility for locating command-server process. +use futures::future::{self, Either, Loop}; use std::env; use std::ffi::{OsStr, OsString}; use std::fs::{self, DirBuilder}; @@ -12,8 +13,12 @@ use std::os::unix::ffi::{OsStrExt, OsStringExt}; use std::os::unix::fs::{DirBuilderExt, MetadataExt}; use std::path::{Path, PathBuf}; -use std::process; +use std::process::{self, Command}; use std::time::Duration; +use tokio::prelude::*; +use tokio_hglib::UnixClient; +use tokio_process::{Child, CommandExt}; +use tokio_timer; use super::procutil; @@ -52,13 +57,113 @@ buf.extend_from_slice(format!(".{}", self.process_id).as_bytes()); OsString::from_vec(buf).into() } + + /// Connects to the server. + /// + /// The server process will be spawned if not running. + pub fn connect(self) -> impl Future { + self.try_connect() + } + + /// Tries to connect to the existing server, or spawns new if not running. + fn try_connect(self) -> impl Future { + debug!("try connect to {}", self.base_sock_path.display()); + UnixClient::connect(self.base_sock_path.clone()).then(|res| match res { + Ok(client) => Either::A(future::ok((self, client))), + Err(_) => Either::B(self.spawn_connect()), + }) + } + + /// Spawns new server process and connects to it. + /// + /// The server will be spawned at the current working directory, then + /// chdir to "/", so that the server will load configs from the target + /// repository. + fn spawn_connect(self) -> impl Future { + let sock_path = self.temp_sock_path(); + debug!("start cmdserver at {}", sock_path.display()); + Command::new(&self.hg_command) + .arg("serve") + .arg("--cmdserver") + .arg("chgunix") + .arg("--address") + .arg(&sock_path) + .arg("--daemon-postexec") + .arg("chdir:/") + .current_dir(&self.current_dir) + .env_clear() + .envs(self.env_vars.iter().cloned()) + .env("CHGINTERNALMARK", "") + .spawn_async() + .into_future() + .and_then(|server| self.connect_spawned(server, sock_path)) + .and_then(|(loc, client, sock_path)| { + debug!( + "rename {} to {}", + sock_path.display(), + loc.base_sock_path.display() + ); + fs::rename(&sock_path, &loc.base_sock_path)?; + Ok((loc, client)) + }) + } + + /// Tries to connect to the just spawned server repeatedly until timeout + /// exceeded. + fn connect_spawned( + self, + server: Child, + sock_path: PathBuf, + ) -> impl Future { + debug!("try connect to {} repeatedly", sock_path.display()); + let connect = future::loop_fn(sock_path, |sock_path| { + UnixClient::connect(sock_path.clone()).then(|res| { + match res { + Ok(client) => Either::A(future::ok(Loop::Break((client, sock_path)))), + Err(_) => { + // try again with slight delay + let fut = tokio_timer::sleep(Duration::from_millis(10)) + .map(|()| Loop::Continue(sock_path)) + .map_err(|err| io::Error::new(io::ErrorKind::Other, err)); + Either::B(fut) + } + } + }) + }); + + // waits for either connection established or server failed to start + connect + .select2(server) + .map_err(|res| res.split().0) + .timeout(self.timeout) + .map_err(|err| { + err.into_inner().unwrap_or_else(|| { + io::Error::new( + io::ErrorKind::TimedOut, + "timed out while connecting to server", + ) + }) + }) + .and_then(|res| { + match res { + Either::A(((client, sock_path), server)) => { + server.forget(); // continue to run in background + Ok((self, client, sock_path)) + } + Either::B((st, _)) => Err(io::Error::new( + io::ErrorKind::Other, + format!("server exited too early: {}", st), + )), + } + }) + } } /// Determines the server socket to connect to. /// /// If no `$CHGSOCKNAME` is specified, the socket directory will be created /// as necessary. -pub fn prepare_server_socket_path() -> io::Result { +fn prepare_server_socket_path() -> io::Result { if let Some(s) = env::var_os("CHGSOCKNAME") { Ok(PathBuf::from(s)) } else { diff -r cf144f50f413 -r bb936e25a84a rust/chg/src/main.rs --- a/rust/chg/src/main.rs Tue Mar 31 23:13:13 2020 +0900 +++ b/rust/chg/src/main.rs Sat Oct 06 20:10:44 2018 +0900 @@ -9,7 +9,7 @@ extern crate tokio; extern crate tokio_hglib; -use chg::locator; +use chg::locator::Locator; use chg::procutil; use chg::{ChgClientExt, ChgUiHandler}; use futures::sync::oneshot; @@ -18,7 +18,6 @@ use std::process; use std::time::Instant; use tokio::prelude::*; -use tokio_hglib::UnixClient; struct DebugLogger { start: Instant, @@ -64,6 +63,8 @@ log::set_max_level(log::LevelFilter::Debug); } + // TODO: add loop detection by $CHGINTERNALMARK + let code = run().unwrap_or_else(|err| { writeln!(io::stderr(), "chg: abort: {}", err).unwrap_or(()); 255 @@ -73,11 +74,12 @@ fn run() -> io::Result { let current_dir = env::current_dir()?; - let sock_path = locator::prepare_server_socket_path()?; + let loc = Locator::prepare_from_env()?; let handler = ChgUiHandler::new(); let (result_tx, result_rx) = oneshot::channel(); - let fut = UnixClient::connect(sock_path) - .and_then(|client| client.set_current_dir(current_dir)) + let fut = loc + .connect() + .and_then(|(_, client)| client.set_current_dir(current_dir)) .and_then(|client| client.attach_io(io::stdin(), io::stdout(), io::stderr())) .and_then(|client| { let pid = client.server_spec().process_id.unwrap();