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use crate::{
client::{Mailbox, SessionChannel},
constants::CLIENT_MAILBOX_CAPACITY,
data::{Request, RequestData, ResponseData},
net::TransportError,
};
use derive_more::{Display, Error, From};
use log::*;
use tokio::{
io,
sync::mpsc,
task::{JoinError, JoinHandle},
};
#[derive(Debug, Display, Error, From)]
pub enum RemoteProcessError {
ChannelDead,
TransportError(TransportError),
UnexpectedEof,
WaitFailed(JoinError),
}
#[derive(Debug)]
pub struct RemoteProcess {
id: usize,
pub(crate) origin_id: usize,
req_task: JoinHandle<Result<(), RemoteProcessError>>,
res_task: JoinHandle<Result<(bool, Option<i32>), RemoteProcessError>>,
pub stdin: Option<RemoteStdin>,
pub stdout: Option<RemoteStdout>,
pub stderr: Option<RemoteStderr>,
kill: mpsc::Sender<()>,
}
impl RemoteProcess {
pub async fn spawn(
tenant: impl Into<String>,
mut channel: SessionChannel,
cmd: impl Into<String>,
args: Vec<String>,
) -> Result<Self, RemoteProcessError> {
let tenant = tenant.into();
let cmd = cmd.into();
let mut mailbox = channel
.mail(Request::new(
tenant.as_str(),
vec![RequestData::ProcRun { cmd, args }],
))
.await?;
let (id, origin_id) = match mailbox.next().await {
Some(res) if res.payload.len() != 1 => {
return Err(RemoteProcessError::TransportError(TransportError::IoError(
io::Error::new(io::ErrorKind::InvalidData, "Got wrong payload size"),
)));
}
Some(res) => {
let origin_id = res.origin_id;
match res.payload.into_iter().next().unwrap() {
ResponseData::ProcStart { id } => (id, origin_id),
x => {
return Err(RemoteProcessError::TransportError(TransportError::IoError(
io::Error::new(
io::ErrorKind::InvalidData,
format!("Got response type of {}", x.as_ref()),
),
)))
}
}
}
None => {
return Err(RemoteProcessError::TransportError(TransportError::IoError(
io::Error::from(io::ErrorKind::ConnectionAborted),
)))
}
};
let (stdin_tx, stdin_rx) = mpsc::channel(CLIENT_MAILBOX_CAPACITY);
let (stdout_tx, stdout_rx) = mpsc::channel(CLIENT_MAILBOX_CAPACITY);
let (stderr_tx, stderr_rx) = mpsc::channel(CLIENT_MAILBOX_CAPACITY);
let (kill_tx, kill_rx) = mpsc::channel(1);
let kill_tx_2 = kill_tx.clone();
let res_task = tokio::spawn(async move {
process_incoming_responses(id, mailbox, stdout_tx, stderr_tx, kill_tx_2).await
});
let req_task = tokio::spawn(async move {
process_outgoing_requests(tenant, id, channel, stdin_rx, kill_rx).await
});
Ok(Self {
id,
origin_id,
req_task,
res_task,
stdin: Some(RemoteStdin(stdin_tx)),
stdout: Some(RemoteStdout(stdout_rx)),
stderr: Some(RemoteStderr(stderr_rx)),
kill: kill_tx,
})
}
pub fn id(&self) -> usize {
self.id
}
pub async fn wait(self) -> Result<(bool, Option<i32>), RemoteProcessError> {
match tokio::try_join!(self.req_task, self.res_task) {
Ok((_, res)) => res,
Err(x) => Err(RemoteProcessError::from(x)),
}
}
pub fn abort(&self) {
self.req_task.abort();
self.res_task.abort();
}
pub async fn kill(&mut self) -> Result<(), RemoteProcessError> {
self.kill
.send(())
.await
.map_err(|_| RemoteProcessError::ChannelDead)?;
Ok(())
}
}
#[derive(Debug)]
pub struct RemoteStdin(mpsc::Sender<String>);
impl RemoteStdin {
pub async fn write(&mut self, data: impl Into<String>) -> io::Result<()> {
self.0
.send(data.into())
.await
.map_err(|x| io::Error::new(io::ErrorKind::BrokenPipe, x))
}
}
#[derive(Debug)]
pub struct RemoteStdout(mpsc::Receiver<String>);
impl RemoteStdout {
pub async fn read(&mut self) -> io::Result<String> {
self.0
.recv()
.await
.ok_or_else(|| io::Error::from(io::ErrorKind::BrokenPipe))
}
}
#[derive(Debug)]
pub struct RemoteStderr(mpsc::Receiver<String>);
impl RemoteStderr {
pub async fn read(&mut self) -> io::Result<String> {
self.0
.recv()
.await
.ok_or_else(|| io::Error::from(io::ErrorKind::BrokenPipe))
}
}
async fn process_outgoing_requests(
tenant: String,
id: usize,
mut channel: SessionChannel,
mut stdin_rx: mpsc::Receiver<String>,
mut kill_rx: mpsc::Receiver<()>,
) -> Result<(), RemoteProcessError> {
let result = loop {
tokio::select! {
data = stdin_rx.recv() => {
match data {
Some(data) => channel.fire(
Request::new(
tenant.as_str(),
vec![RequestData::ProcStdin { id, data }]
)
).await?,
None => break Err(RemoteProcessError::ChannelDead),
}
}
msg = kill_rx.recv() => {
if msg.is_some() {
channel.fire(Request::new(
tenant.as_str(),
vec![RequestData::ProcKill { id }],
)).await?;
break Ok(());
} else {
break Err(RemoteProcessError::ChannelDead);
}
}
}
};
trace!("Process outgoing channel closed");
result
}
async fn process_incoming_responses(
proc_id: usize,
mut mailbox: Mailbox,
stdout_tx: mpsc::Sender<String>,
stderr_tx: mpsc::Sender<String>,
kill_tx: mpsc::Sender<()>,
) -> Result<(bool, Option<i32>), RemoteProcessError> {
while let Some(res) = mailbox.next().await {
let exit_status = res.payload.iter().find_map(|data| match data {
ResponseData::ProcDone { id, success, code } if *id == proc_id => {
Some((*success, *code))
}
_ => None,
});
for data in res.payload {
match data {
ResponseData::ProcStdout { id, data } if id == proc_id => {
let _ = stdout_tx.send(data).await;
}
ResponseData::ProcStderr { id, data } if id == proc_id => {
let _ = stderr_tx.send(data).await;
}
_ => {}
}
}
if let Some((success, code)) = exit_status {
let _ = kill_tx.try_send(());
return Ok((success, code));
}
}
let _ = kill_tx.try_send(());
trace!("Process incoming channel closed");
Err(RemoteProcessError::UnexpectedEof)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{
client::Session,
data::{Error, ErrorKind, Response},
net::{InmemoryStream, PlainCodec, Transport},
};
fn make_session() -> (Transport<InmemoryStream, PlainCodec>, Session) {
let (t1, t2) = Transport::make_pair();
(t1, Session::initialize(t2).unwrap())
}
#[tokio::test]
async fn spawn_should_return_invalid_data_if_payload_size_unexpected() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
transport
.send(Response::new("test-tenant", req.id, Vec::new()))
.await
.unwrap();
let result = spawn_task.await.unwrap();
assert!(
matches!(
&result,
Err(RemoteProcessError::TransportError(TransportError::IoError(x)))
if x.kind() == io::ErrorKind::InvalidData
),
"Unexpected result: {:?}",
result
);
}
#[tokio::test]
async fn spawn_should_return_invalid_data_if_did_not_get_a_indicator_that_process_started() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::Error(Error {
kind: ErrorKind::Other,
description: String::from("some error"),
})],
))
.await
.unwrap();
let result = spawn_task.await.unwrap();
assert!(
matches!(
&result,
Err(RemoteProcessError::TransportError(TransportError::IoError(x)))
if x.kind() == io::ErrorKind::InvalidData
),
"Unexpected result: {:?}",
result
);
}
#[tokio::test]
async fn kill_should_return_error_if_internal_tasks_already_completed() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let mut proc = spawn_task.await.unwrap().unwrap();
proc.abort();
tokio::task::yield_now().await;
let result = proc.kill().await;
assert!(
matches!(result, Err(RemoteProcessError::ChannelDead)),
"Unexpected result: {:?}",
result
);
}
#[tokio::test]
async fn kill_should_send_proc_kill_request_and_then_cause_stdin_forwarding_to_close() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let mut proc = spawn_task.await.unwrap().unwrap();
assert!(proc.kill().await.is_ok(), "Failed to send kill request");
let req = transport.receive::<Request>().await.unwrap().unwrap();
assert_eq!(
req.payload.len(),
1,
"Unexpected payload length for kill request"
);
assert_eq!(req.payload[0], RequestData::ProcKill { id });
assert_eq!(
proc.stdin
.as_mut()
.unwrap()
.write("some stdin")
.await
.unwrap_err()
.kind(),
io::ErrorKind::BrokenPipe
);
}
#[tokio::test]
async fn stdin_should_be_forwarded_from_receiver_field() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let mut proc = spawn_task.await.unwrap().unwrap();
proc.stdin
.as_mut()
.unwrap()
.write("some input")
.await
.unwrap();
match &transport
.receive::<Request>()
.await
.unwrap()
.unwrap()
.payload[0]
{
RequestData::ProcStdin { id, data } => {
assert_eq!(*id, 12345);
assert_eq!(data, "some input");
}
x => panic!("Unexpected request: {:?}", x),
}
}
#[tokio::test]
async fn stdout_should_be_forwarded_to_receiver_field() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let mut proc = spawn_task.await.unwrap().unwrap();
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStdout {
id,
data: String::from("some out"),
}],
))
.await
.unwrap();
let out = proc.stdout.as_mut().unwrap().read().await.unwrap();
assert_eq!(out, "some out");
}
#[tokio::test]
async fn stderr_should_be_forwarded_to_receiver_field() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let mut proc = spawn_task.await.unwrap().unwrap();
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStderr {
id,
data: String::from("some err"),
}],
))
.await
.unwrap();
let out = proc.stderr.as_mut().unwrap().read().await.unwrap();
assert_eq!(out, "some err");
}
#[tokio::test]
async fn wait_should_return_error_if_internal_tasks_fail() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let proc = spawn_task.await.unwrap().unwrap();
proc.abort();
let result = proc.wait().await;
assert!(
matches!(result, Err(RemoteProcessError::WaitFailed(_))),
"Unexpected result: {:?}",
result
);
}
#[tokio::test]
async fn wait_should_return_error_if_connection_terminates_before_receiving_done_response() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let proc = spawn_task.await.unwrap().unwrap();
tokio::task::yield_now().await;
drop(transport);
tokio::task::yield_now().await;
let result = proc.wait().await;
assert!(
matches!(result, Err(RemoteProcessError::UnexpectedEof)),
"Unexpected result: {:?}",
result
);
}
#[tokio::test]
async fn receiving_done_response_should_result_in_wait_returning_exit_information() {
let (mut transport, session) = make_session();
let spawn_task = tokio::spawn(async move {
RemoteProcess::spawn(
String::from("test-tenant"),
session.clone_channel(),
String::from("cmd"),
vec![String::from("arg")],
)
.await
});
let req = transport.receive::<Request>().await.unwrap().unwrap();
let id = 12345;
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcStart { id }],
))
.await
.unwrap();
let proc = spawn_task.await.unwrap().unwrap();
let proc_wait_task = tokio::spawn(proc.wait());
transport
.send(Response::new(
"test-tenant",
req.id,
vec![ResponseData::ProcDone {
id,
success: false,
code: Some(123),
}],
))
.await
.unwrap();
assert_eq!(proc_wait_task.await.unwrap().unwrap(), (false, Some(123)));
}
}