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ssh remote: Stream stderr from server via proxy to client (#19073)

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Release Notes:

- N/A

---------

Co-authored-by: Bennet <bennet@zed.dev>
This commit is contained in:
Thorsten Ball 2024-10-11 17:11:20 +02:00 • committed by GitHub
parent d976c5f1b6
commit c21f26c419
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GPG key ID: B5690EEEBB952194
3 changed files with 220 additions and 97 deletions
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3
crates/remote/src/ssh_session.rs
View file

@ -836,8 +836,7 @@ impl SshRemoteClient {
let line_ix = start_ix + ix; let line_ix = start_ix + ix;
let content = &stderr_buffer[start_ix..line_ix]; let content = &stderr_buffer[start_ix..line_ix];
start_ix = line_ix + 1; start_ix = line_ix + 1;
if let Ok(mut record) = serde_json::from_slice::<LogRecord>(content) { if let Ok(record) = serde_json::from_slice::<LogRecord>(content) {
record.message = format!("(remote) {}", record.message);
record.log(log::logger()) record.log(log::logger())
} else { } else {
eprintln!("(remote) {}", String::from_utf8_lossy(content)); eprintln!("(remote) {}", String::from_utf8_lossy(content));

33
crates/remote_server/src/main.rs
View file

@ -22,6 +22,8 @@ enum Commands {
stdin_socket: PathBuf, stdin_socket: PathBuf,
#[arg(long)] #[arg(long)]
stdout_socket: PathBuf, stdout_socket: PathBuf,
#[arg(long)]
stderr_socket: PathBuf,
}, },
Proxy { Proxy {
#[arg(long)] #[arg(long)]
@ -40,7 +42,7 @@ fn main() {
#[cfg(not(windows))] #[cfg(not(windows))]
fn main() -> Result<()> { fn main() -> Result<()> {
use remote::proxy::ProxyLaunchError; use remote::proxy::ProxyLaunchError;
use remote_server::unix::{execute_proxy, execute_run, init}; use remote_server::unix::{execute_proxy, execute_run};
let cli = Cli::parse(); let cli = Cli::parse();
@ -50,25 +52,26 @@ fn main() -> Result<()> {
pid_file, pid_file,
stdin_socket, stdin_socket,
stdout_socket, stdout_socket,
}) => { stderr_socket,
init(Some(log_file))?; }) => execute_run(
execute_run(pid_file, stdin_socket, stdout_socket) log_file,
} pid_file,
stdin_socket,
stdout_socket,
stderr_socket,
),
Some(Commands::Proxy { Some(Commands::Proxy {
identifier, identifier,
reconnect, reconnect,
}) => { }) => match execute_proxy(identifier, reconnect) {
init(None)?; Ok(_) => Ok(()),
match execute_proxy(identifier, reconnect) { Err(err) => {
Ok(_) => Ok(()), if let Some(err) = err.downcast_ref::<ProxyLaunchError>() {
Err(err) => { std::process::exit(err.to_exit_code());
if let Some(err) = err.downcast_ref::<ProxyLaunchError>() {
std::process::exit(err.to_exit_code());
}
Err(err)
} }
Err(err)
} }
} },
Some(Commands::Version) => { Some(Commands::Version) => {
eprintln!("{}", env!("ZED_PKG_VERSION")); eprintln!("{}", env!("ZED_PKG_VERSION"));
Ok(()) Ok(())

281
crates/remote_server/src/unix.rs
View file

@ -2,7 +2,7 @@ use crate::HeadlessProject;
use anyhow::{anyhow, Context, Result}; use anyhow::{anyhow, Context, Result};
use fs::RealFs; use fs::RealFs;
use futures::channel::mpsc; use futures::channel::mpsc;
use futures::{select, select_biased, AsyncRead, AsyncWrite, FutureExt, SinkExt}; use futures::{select, select_biased, AsyncRead, AsyncWrite, AsyncWriteExt, FutureExt, SinkExt};
use gpui::{AppContext, Context as _}; use gpui::{AppContext, Context as _};
use remote::proxy::ProxyLaunchError; use remote::proxy::ProxyLaunchError;
use remote::ssh_session::ChannelClient; use remote::ssh_session::ChannelClient;
@ -11,8 +11,10 @@ use remote::{
protocol::{read_message, write_message}, protocol::{read_message, write_message},
}; };
use rpc::proto::Envelope; use rpc::proto::Envelope;
use smol::channel::{Receiver, Sender};
use smol::io::AsyncReadExt;
use smol::Async; use smol::Async;
use smol::{io::AsyncWriteExt, net::unix::UnixListener, stream::StreamExt as _}; use smol::{net::unix::UnixListener, stream::StreamExt as _};
use std::{ use std::{
env, env,
io::Write, io::Write,
@ -21,36 +23,70 @@ use std::{
sync::Arc, sync::Arc,
}; };
pub fn init(log_file: Option<PathBuf>) -> Result<()> { fn init_logging_proxy() {
init_logging(log_file)?; env_logger::builder()
init_panic_hook(); .format(|buf, record| {
Ok(()) let mut log_record = LogRecord::new(record);
log_record.message = format!("(remote proxy) {}", log_record.message);
serde_json::to_writer(&mut *buf, &log_record)?;
buf.write_all(b"\n")?;
Ok(())
})
.init();
} }
fn init_logging(log_file: Option<PathBuf>) -> Result<()> { fn init_logging_server(log_file_path: PathBuf) -> Result<Receiver<Vec<u8>>> {
if let Some(log_file) = log_file { struct MultiWrite {
let target = Box::new(if log_file.exists() { file: Box<dyn std::io::Write + Send + 'static>,
std::fs::OpenOptions::new() channel: Sender<Vec<u8>>,
.append(true) buffer: Vec<u8>,
.open(&log_file)
.context("Failed to open log file in append mode")?
} else {
std::fs::File::create(&log_file).context("Failed to create log file")?
});
env_logger::Builder::from_default_env()
.target(env_logger::Target::Pipe(target))
.init();
} else {
env_logger::builder()
.format(|buf, record| {
serde_json::to_writer(&mut *buf, &LogRecord::new(record))?;
buf.write_all(b"\n")?;
Ok(())
})
.init();
} }
Ok(())
impl std::io::Write for MultiWrite {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
let written = self.file.write(buf)?;
self.buffer.extend_from_slice(&buf[..written]);
Ok(written)
}
fn flush(&mut self) -> std::io::Result<()> {
self.channel
.send_blocking(self.buffer.clone())
.map_err(|error| std::io::Error::new(std::io::ErrorKind::Other, error))?;
self.buffer.clear();
self.file.flush()
}
}
let log_file = Box::new(if log_file_path.exists() {
std::fs::OpenOptions::new()
.append(true)
.open(&log_file_path)
.context("Failed to open log file in append mode")?
} else {
std::fs::File::create(&log_file_path).context("Failed to create log file")?
});
let (tx, rx) = smol::channel::unbounded();
let target = Box::new(MultiWrite {
file: log_file,
channel: tx,
buffer: Vec::new(),
});
env_logger::Builder::from_default_env()
.target(env_logger::Target::Pipe(target))
.format(|buf, record| {
let mut log_record = LogRecord::new(record);
log_record.message = format!("(remote server) {}", log_record.message);
serde_json::to_writer(&mut *buf, &log_record)?;
buf.write_all(b"\n")?;
Ok(())
})
.init();
Ok(rx)
} }
fn init_panic_hook() { fn init_panic_hook() {
@ -83,7 +119,7 @@ fn init_panic_hook() {
} }
log::error!( log::error!(
"server: panic occurred: {}\nBacktrace:\n{}", "panic occurred: {}\nBacktrace:\n{}",
payload, payload,
backtrace.join("\n") backtrace.join("\n")
); );
@ -92,9 +128,25 @@ fn init_panic_hook() {
})); }));
} }
struct ServerListeners {
stdin: UnixListener,
stdout: UnixListener,
stderr: UnixListener,
}
impl ServerListeners {
pub fn new(stdin_path: PathBuf, stdout_path: PathBuf, stderr_path: PathBuf) -> Result<Self> {
Ok(Self {
stdin: UnixListener::bind(stdin_path).context("failed to bind stdin socket")?,
stdout: UnixListener::bind(stdout_path).context("failed to bind stdout socket")?,
stderr: UnixListener::bind(stderr_path).context("failed to bind stderr socket")?,
})
}
}
fn start_server( fn start_server(
stdin_listener: UnixListener, listeners: ServerListeners,
stdout_listener: UnixListener, mut log_rx: Receiver<Vec<u8>>,
cx: &mut AppContext, cx: &mut AppContext,
) -> Arc<ChannelClient> { ) -> Arc<ChannelClient> {
// This is the server idle timeout. If no connection comes in in this timeout, the server will shut down. // This is the server idle timeout. If no connection comes in in this timeout, the server will shut down.
@ -114,22 +166,24 @@ fn start_server(
.detach(); .detach();
cx.spawn(|cx| async move { cx.spawn(|cx| async move {
let mut stdin_incoming = stdin_listener.incoming(); let mut stdin_incoming = listeners.stdin.incoming();
let mut stdout_incoming = stdout_listener.incoming(); let mut stdout_incoming = listeners.stdout.incoming();
let mut stderr_incoming = listeners.stderr.incoming();
loop { loop {
let streams = futures::future::join(stdin_incoming.next(), stdout_incoming.next()); let streams = futures::future::join3(stdin_incoming.next(), stdout_incoming.next(), stderr_incoming.next());
log::info!("server: accepting new connections"); log::info!("accepting new connections");
let result = select! { let result = select! {
streams = streams.fuse() => { streams = streams.fuse() => {
let (Some(Ok(stdin_stream)), Some(Ok(stdout_stream))) = streams else { log::warn!("stdin {:?}, stdout: {:?}, stderr: {:?}", streams.0, streams.1, streams.2);
let (Some(Ok(stdin_stream)), Some(Ok(stdout_stream)), Some(Ok(stderr_stream))) = streams else {
break; break;
}; };
anyhow::Ok((stdin_stream, stdout_stream)) anyhow::Ok((stdin_stream, stdout_stream, stderr_stream))
} }
_ = futures::FutureExt::fuse(smol::Timer::after(IDLE_TIMEOUT)) => { _ = futures::FutureExt::fuse(smol::Timer::after(IDLE_TIMEOUT)) => {
log::warn!("server: timed out waiting for new connections after {:?}. exiting.", IDLE_TIMEOUT); log::warn!("timed out waiting for new connections after {:?}. exiting.", IDLE_TIMEOUT);
cx.update(|cx| { cx.update(|cx| {
// TODO: This is a hack, because in a headless project, shutdown isn't executed // TODO: This is a hack, because in a headless project, shutdown isn't executed
// when calling quit, but it should be. // when calling quit, but it should be.
@ -143,10 +197,12 @@ fn start_server(
} }
}; };
let Ok((mut stdin_stream, mut stdout_stream)) = result else { let Ok((mut stdin_stream, mut stdout_stream, mut stderr_stream)) = result else {
break; break;
}; };
log::info!("yep! we got connections");
let mut input_buffer = Vec::new(); let mut input_buffer = Vec::new();
let mut output_buffer = Vec::new(); let mut output_buffer = Vec::new();
loop { loop {
@ -159,33 +215,47 @@ fn start_server(
let message = match stdin_message { let message = match stdin_message {
Ok(message) => message, Ok(message) => message,
Err(error) => { Err(error) => {
log::warn!("server: error reading message on stdin: {}. exiting.", error); log::warn!("error reading message on stdin: {}. exiting.", error);
break; break;
} }
}; };
if let Err(error) = incoming_tx.unbounded_send(message) { if let Err(error) = incoming_tx.unbounded_send(message) {
log::error!("server: failed to send message to application: {:?}. exiting.", error); log::error!("failed to send message to application: {:?}. exiting.", error);
return Err(anyhow!(error)); return Err(anyhow!(error));
} }
} }
outgoing_message = outgoing_rx.next().fuse() => { outgoing_message = outgoing_rx.next().fuse() => {
let Some(message) = outgoing_message else { let Some(message) = outgoing_message else {
log::error!("server: stdout handler, no message"); log::error!("stdout handler, no message");
break; break;
}; };
if let Err(error) = if let Err(error) =
write_message(&mut stdout_stream, &mut output_buffer, message).await write_message(&mut stdout_stream, &mut output_buffer, message).await
{ {
log::error!("server: failed to write stdout message: {:?}", error); log::error!("failed to write stdout message: {:?}", error);
break; break;
} }
if let Err(error) = stdout_stream.flush().await { if let Err(error) = stdout_stream.flush().await {
log::error!("server: failed to flush stdout message: {:?}", error); log::error!("failed to flush stdout message: {:?}", error);
break; break;
} }
} }
// // TODO: How do we handle backpressure?
log_message = log_rx.next().fuse() => {
if let Some(log_message) = log_message {
if let Err(error) = stderr_stream.write_all(&log_message).await {
log::error!("failed to write log message to stderr: {:?}", error);
break;
}
if let Err(error) = stderr_stream.flush().await {
log::error!("failed to flush stderr stream: {:?}", error);
break;
}
}
}
} }
} }
} }
@ -196,35 +266,44 @@ fn start_server(
ChannelClient::new(incoming_rx, outgoing_tx, cx) ChannelClient::new(incoming_rx, outgoing_tx, cx)
} }
pub fn execute_run(pid_file: PathBuf, stdin_socket: PathBuf, stdout_socket: PathBuf) -> Result<()> { pub fn execute_run(
log_file: PathBuf,
pid_file: PathBuf,
stdin_socket: PathBuf,
stdout_socket: PathBuf,
stderr_socket: PathBuf,
) -> Result<()> {
let log_rx = init_logging_server(log_file)?;
init_panic_hook();
log::info!( log::info!(
"server: starting up. pid_file: {:?}, stdin_socket: {:?}, stdout_socket: {:?}", "starting up. pid_file: {:?}, stdin_socket: {:?}, stdout_socket: {:?}, stderr_socket: {:?}",
pid_file, pid_file,
stdin_socket, stdin_socket,
stdout_socket stdout_socket,
stderr_socket
); );
write_pid_file(&pid_file) write_pid_file(&pid_file)
.with_context(|| format!("failed to write pid file: {:?}", &pid_file))?; .with_context(|| format!("failed to write pid file: {:?}", &pid_file))?;
let stdin_listener = UnixListener::bind(stdin_socket).context("failed to bind stdin socket")?; let listeners = ServerListeners::new(stdin_socket, stdout_socket, stderr_socket)?;
let stdout_listener =
UnixListener::bind(stdout_socket).context("failed to bind stdout socket")?;
log::debug!("server: starting gpui app"); log::debug!("starting gpui app");
gpui::App::headless().run(move |cx| { gpui::App::headless().run(move |cx| {
settings::init(cx); settings::init(cx);
HeadlessProject::init(cx); HeadlessProject::init(cx);
log::info!("server: gpui app started, initializing server"); log::info!("gpui app started, initializing server");
let session = start_server(stdin_listener, stdout_listener, cx); let session = start_server(listeners, log_rx, cx);
let project = cx.new_model(|cx| { let project = cx.new_model(|cx| {
HeadlessProject::new(session, Arc::new(RealFs::new(Default::default(), None)), cx) HeadlessProject::new(session, Arc::new(RealFs::new(Default::default(), None)), cx)
}); });
mem::forget(project); mem::forget(project);
}); });
log::info!("server: gpui app is shut down. quitting."); log::info!("gpui app is shut down. quitting.");
Ok(()) Ok(())
} }
@ -234,6 +313,7 @@ struct ServerPaths {
pid_file: PathBuf, pid_file: PathBuf,
stdin_socket: PathBuf, stdin_socket: PathBuf,
stdout_socket: PathBuf, stdout_socket: PathBuf,
stderr_socket: PathBuf,
} }
impl ServerPaths { impl ServerPaths {
@ -243,19 +323,24 @@ impl ServerPaths {
let pid_file = project_dir.join("server.pid"); let pid_file = project_dir.join("server.pid");
let stdin_socket = project_dir.join("stdin.sock"); let stdin_socket = project_dir.join("stdin.sock");
let stdout_socket = project_dir.join("stdout.sock"); let stdout_socket = project_dir.join("stdout.sock");
let stderr_socket = project_dir.join("stderr.sock");
let log_file = project_dir.join("server.log"); let log_file = project_dir.join("server.log");
Ok(Self { Ok(Self {
pid_file, pid_file,
stdin_socket, stdin_socket,
stdout_socket, stdout_socket,
stderr_socket,
log_file, log_file,
}) })
} }
} }
pub fn execute_proxy(identifier: String, is_reconnecting: bool) -> Result<()> { pub fn execute_proxy(identifier: String, is_reconnecting: bool) -> Result<()> {
log::debug!("proxy: starting up. PID: {}", std::process::id()); init_logging_proxy();
init_panic_hook();
log::debug!("starting up. PID: {}", std::process::id());
let server_paths = ServerPaths::new(&identifier)?; let server_paths = ServerPaths::new(&identifier)?;
@ -263,12 +348,12 @@ pub fn execute_proxy(identifier: String, is_reconnecting: bool) -> Result<()> {
let server_running = server_pid.is_some(); let server_running = server_pid.is_some();
if is_reconnecting { if is_reconnecting {
if !server_running { if !server_running {
log::error!("proxy: attempted to reconnect, but no server running"); log::error!("attempted to reconnect, but no server running");
return Err(anyhow!(ProxyLaunchError::ServerNotRunning)); return Err(anyhow!(ProxyLaunchError::ServerNotRunning));
} }
} else { } else {
if let Some(pid) = server_pid { if let Some(pid) = server_pid {
log::debug!("proxy: found server already running with PID {}. Killing process and cleaning up files...", pid); log::debug!("found server already running with PID {}. Killing process and cleaning up files...", pid);
kill_running_server(pid, &server_paths)?; kill_running_server(pid, &server_paths)?;
} }
@ -287,11 +372,35 @@ pub fn execute_proxy(identifier: String, is_reconnecting: bool) -> Result<()> {
handle_io(stream, stdout, "stdout").await handle_io(stream, stdout, "stdout").await
}); });
if let Err(forwarding_result) = let stderr_task: smol::Task<Result<()>> = smol::spawn(async move {
smol::block_on(async move { smol::future::race(stdin_task, stdout_task).await }) let mut stderr = Async::new(std::io::stderr())?;
{ let mut stream = smol::net::unix::UnixStream::connect(&server_paths.stderr_socket).await?;
let mut stderr_buffer = vec![0; 2048];
loop {
match stream.read(&mut stderr_buffer).await {
Ok(0) => {
return anyhow::Ok(());
}
Ok(n) => {
stderr.write_all(&mut stderr_buffer[..n]).await?;
stderr.flush().await?;
}
Err(error) => {
Err(anyhow!("error reading stderr: {error:?}"))?;
}
}
}
});
if let Err(forwarding_result) = smol::block_on(async move {
futures::select! {
result = stdin_task.fuse() => result,
result = stdout_task.fuse() => result,
result = stderr_task.fuse() => result,
}
}) {
log::error!( log::error!(
"proxy: failed to forward messages: {:?}, terminating...", "failed to forward messages: {:?}, terminating...",
forwarding_result forwarding_result
); );
return Err(forwarding_result); return Err(forwarding_result);
@ -314,17 +423,19 @@ fn create_state_directory(identifier: &str) -> Result<PathBuf> {
} }
fn kill_running_server(pid: u32, paths: &ServerPaths) -> Result<()> { fn kill_running_server(pid: u32, paths: &ServerPaths) -> Result<()> {
log::info!("proxy: killing existing server with PID {}", pid); log::info!("killing existing server with PID {}", pid);
std::process::Command::new("kill") std::process::Command::new("kill")
.arg(pid.to_string()) .arg(pid.to_string())
.output() .output()
.context("proxy: failed to kill existing server")?; .context("failed to kill existing server")?;
for file in [&paths.pid_file, &paths.stdin_socket, &paths.stdout_socket] { for file in [
log::debug!( &paths.pid_file,
"proxy: cleaning up file {:?} before starting new server", &paths.stdin_socket,
file &paths.stdout_socket,
); &paths.stderr_socket,
] {
log::debug!("cleaning up file {:?} before starting new server", file);
std::fs::remove_file(file).ok(); std::fs::remove_file(file).ok();
} }
Ok(()) Ok(())
@ -337,6 +448,9 @@ fn spawn_server(paths: &ServerPaths) -> Result<()> {
if paths.stdout_socket.exists() { if paths.stdout_socket.exists() {
std::fs::remove_file(&paths.stdout_socket)?; std::fs::remove_file(&paths.stdout_socket)?;
} }
if paths.stderr_socket.exists() {
std::fs::remove_file(&paths.stderr_socket)?;
}
let binary_name = std::env::current_exe()?; let binary_name = std::env::current_exe()?;
let server_process = std::process::Command::new(binary_name) let server_process = std::process::Command::new(binary_name)
@ -349,20 +463,25 @@ fn spawn_server(paths: &ServerPaths) -> Result<()> {
.arg(&paths.stdin_socket) .arg(&paths.stdin_socket)
.arg("--stdout-socket") .arg("--stdout-socket")
.arg(&paths.stdout_socket) .arg(&paths.stdout_socket)
.arg("--stderr-socket")
.arg(&paths.stderr_socket)
.spawn()?; .spawn()?;
log::debug!("proxy: server started. PID: {:?}", server_process.id()); log::debug!("server started. PID: {:?}", server_process.id());
let mut total_time_waited = std::time::Duration::from_secs(0); let mut total_time_waited = std::time::Duration::from_secs(0);
let wait_duration = std::time::Duration::from_millis(20); let wait_duration = std::time::Duration::from_millis(20);
while !paths.stdout_socket.exists() || !paths.stdin_socket.exists() { while !paths.stdout_socket.exists()
log::debug!("proxy: waiting for server to be ready to accept connections..."); || !paths.stdin_socket.exists()
|| !paths.stderr_socket.exists()
{
log::debug!("waiting for server to be ready to accept connections...");
std::thread::sleep(wait_duration); std::thread::sleep(wait_duration);
total_time_waited += wait_duration; total_time_waited += wait_duration;
} }
log::info!( log::info!(
"proxy: server ready to accept connections. total time waited: {:?}", "server ready to accept connections. total time waited: {:?}",
total_time_waited total_time_waited
); );
Ok(()) Ok(())
@ -376,19 +495,21 @@ fn check_pid_file(path: &Path) -> Result<Option<u32>> {
return Ok(None); return Ok(None);
}; };
log::debug!("proxy: Checking if process with PID {} exists...", pid); log::debug!("Checking if process with PID {} exists...", pid);
match std::process::Command::new("kill") match std::process::Command::new("kill")
.arg("-0") .arg("-0")
.arg(pid.to_string()) .arg(pid.to_string())
.output() .output()
{ {
Ok(output) if output.status.success() => { Ok(output) if output.status.success() => {
log::debug!("proxy: Process with PID {} exists. NOT spawning new server, but attaching to existing one.", pid); log::debug!("Process with PID {} exists. NOT spawning new server, but attaching to existing one.", pid);
Ok(Some(pid)) Ok(Some(pid))
} }
_ => { _ => {
log::debug!("proxy: Found PID file, but process with that PID does not exist. Removing PID file."); log::debug!(
std::fs::remove_file(&path).context("proxy: Failed to remove PID file")?; "Found PID file, but process with that PID does not exist. Removing PID file."
);
std::fs::remove_file(&path).context("Failed to remove PID file")?;
Ok(None) Ok(None)
} }
} }
@ -399,7 +520,7 @@ fn write_pid_file(path: &Path) -> Result<()> {
std::fs::remove_file(path)?; std::fs::remove_file(path)?;
} }
let pid = std::process::id().to_string(); let pid = std::process::id().to_string();
log::debug!("server: writing PID {} to file {:?}", pid, path); log::debug!("writing PID {} to file {:?}", pid, path);
std::fs::write(path, pid).context("Failed to write PID file") std::fs::write(path, pid).context("Failed to write PID file")
} }
@ -414,11 +535,11 @@ where
loop { loop {
read_message_raw(&mut reader, &mut buffer) read_message_raw(&mut reader, &mut buffer)
.await .await
.with_context(|| format!("proxy: failed to read message from {}", socket_name))?; .with_context(|| format!("failed to read message from {}", socket_name))?;
write_size_prefixed_buffer(&mut writer, &mut buffer) write_size_prefixed_buffer(&mut writer, &mut buffer)
.await .await
.with_context(|| format!("proxy: failed to write message to {}", socket_name))?; .with_context(|| format!("failed to write message to {}", socket_name))?;
writer.flush().await?; writer.flush().await?;