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agent: Fix exec hang issues with a backgroud process

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Issue #4747 and pull request #4748 fix exec hang issues where the exec
command hangs when a process's stdout is not closed. However, the PR might
cause the exec command not to work as expected, leading to CI failure. The
PR was reverted in #7042. This PR resolves the exec hang issues and has
undergone 1000 rounds of testing to verify that it would not cause any CI
failures.

Fixes: #4747

Signed-off-by: Fupan Li <fupan.lfp@antgroup.com>
Signed-off-by: Xuewei Niu <niuxuewei.nxw@antgroup.com>
This commit is contained in:
Xuewei Niu 2023-07-16 08:32:45 +08:00
parent f6a51a8a78
commit 6c91af0a26
2 changed files with 13 additions and 6 deletions
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2
src/agent/rustjail/src/process.rs
View File

@ -161,7 +161,7 @@ impl Process {
pub fn notify_term_close(&mut self) {
let notify = self.term_exit_notifier.clone();
notify.notify_one();
notify.notify_waiters();
}
pub fn close_stdin(&mut self) {

17
src/agent/src/rpc.rs
View File

@ -595,15 +595,16 @@ impl AgentService {
let cid = req.container_id;
let eid = req.exec_id;
let mut term_exit_notifier = Arc::new(tokio::sync::Notify::new());
let term_exit_notifier;
let reader = {
let s = self.sandbox.clone();
let mut sandbox = s.lock().await;
let p = sandbox.find_container_process(cid.as_str(), eid.as_str())?;
term_exit_notifier = p.term_exit_notifier.clone();
if p.term_master.is_some() {
term_exit_notifier = p.term_exit_notifier.clone();
p.get_reader(StreamType::TermMaster)
} else if stdout {
if p.parent_stdout.is_some() {
@ -623,9 +624,12 @@ impl AgentService {
let reader = reader.ok_or_else(|| anyhow!("cannot get stream reader"))?;
tokio::select! {
_ = term_exit_notifier.notified() => {
Err(anyhow!("eof"))
}
// Poll the futures in the order they appear from top to bottom
// it is very important to avoid data loss. If there is still
// data in the buffer and read_stream branch will return
// Poll::Ready so that the term_exit_notifier will never polled
// before all data were read.
biased;
v = read_stream(reader, req.len as usize) => {
let vector = v?;
let mut resp = ReadStreamResponse::new();
@ -633,6 +637,9 @@ impl AgentService {
Ok(resp)
}
_ = term_exit_notifier.notified() => {
Err(anyhow!("eof"))
}
}
}
}