LemmyNet/pict-rs
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Inline process background future, clean tracing a bit

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This commit is contained in:
asonix 2023-12-22 13:12:19 -06:00
parent db43392a3b
commit b94ba5fcfc
10 changed files with 142 additions and 100 deletions
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2
src/generate.rs
View file

@ -47,7 +47,7 @@ impl Drop for MetricsGuard {
}
#[allow(clippy::too_many_arguments)]
#[tracing::instrument(skip(repo, store, hash, process_map, config))]
#[tracing::instrument(skip(tmp_dir, repo, store, hash, process_map, config))]
pub(crate) async fn generate<S: Store + 'static>(
tmp_dir: &TmpDir,
repo: &ArcRepo,

2
src/ingest.rs
View file

@ -144,7 +144,7 @@ where
Ok((input_type, identifier, details, state))
}
#[tracing::instrument(skip(repo, store, client, stream, config))]
#[tracing::instrument(skip(tmp_dir, repo, store, client, stream, config))]
pub(crate) async fn ingest<S>(
tmp_dir: &TmpDir,
repo: &ArcRepo,

2
src/lib.rs
View file

@ -866,7 +866,7 @@ async fn not_found_hash(repo: &ArcRepo) -> Result<Option<(Alias, Hash)>, Error>
#[allow(clippy::too_many_arguments)]
#[tracing::instrument(
name = "Serving processed image",
skip(repo, store, client, config, process_map)
skip(tmp_dir, repo, store, client, config, process_map)
)]
async fn process<S: Store + 'static>(
range: Option<web::Header<Range>>,

143
src/process.rs
View file

@ -14,21 +14,25 @@ use std::{
use tokio::{
io::{AsyncRead, AsyncWriteExt, ReadBuf},
process::{Child, ChildStdin, ChildStdout, Command},
task::JoinHandle,
};
use tracing::{Instrument, Span};
use uuid::Uuid;
use crate::{error_code::ErrorCode, future::WithTimeout};
use crate::{
error_code::ErrorCode,
future::{LocalBoxFuture, WithTimeout},
sync::DropHandle,
};
struct MetricsGuard {
start: Instant,
armed: bool,
command: String,
command: Arc<str>,
}
impl MetricsGuard {
fn guard(command: String) -> Self {
metrics::increment_counter!("pict-rs.process.start", "command" => command.clone());
fn guard(command: Arc<str>) -> Self {
metrics::increment_counter!("pict-rs.process.start", "command" => command.to_string());
Self {
start: Instant::now(),
@ -47,11 +51,11 @@ impl Drop for MetricsGuard {
metrics::histogram!(
"pict-rs.process.duration",
self.start.elapsed().as_secs_f64(),
"command" => self.command.clone(),
"command" => self.command.to_string(),
"completed" => (!self.armed).to_string(),
);
metrics::increment_counter!("pict-rs.process.end", "completed" => (!self.armed).to_string() , "command" => self.command.clone());
metrics::increment_counter!("pict-rs.process.end", "completed" => (!self.armed).to_string() , "command" => self.command.to_string());
}
}
@ -59,10 +63,11 @@ impl Drop for MetricsGuard {
struct StatusError(ExitStatus);
pub(crate) struct Process {
command: String,
command: Arc<str>,
child: Child,
guard: MetricsGuard,
timeout: Duration,
id: Uuid,
}
impl std::fmt::Debug for Process {
@ -71,10 +76,6 @@ impl std::fmt::Debug for Process {
}
}
struct DropHandle {
inner: JoinHandle<std::io::Result<()>>,
}
struct ProcessReadState {
flags: AtomicU8,
parent: Mutex<Option<Waker>>,
@ -86,29 +87,31 @@ struct ProcessReadWaker {
}
pub(crate) struct ProcessRead {
inner: ChildStdout,
handle: DropHandle,
stdout: ChildStdout,
handle: LocalBoxFuture<'static, std::io::Result<()>>,
closed: bool,
state: Arc<ProcessReadState>,
span: Span,
span: Option<Span>,
command: Arc<str>,
id: Uuid,
}
#[derive(Debug, thiserror::Error)]
pub(crate) enum ProcessError {
#[error("Required command {0} not found, make sure it exists in pict-rs' $PATH")]
NotFound(String),
NotFound(Arc<str>),
#[error("Cannot run command {0} due to invalid permissions on binary, make sure the pict-rs user has permission to run it")]
PermissionDenied(String),
PermissionDenied(Arc<str>),
#[error("Reached process spawn limit")]
LimitReached,
#[error("{0} timed out")]
Timeout(String),
Timeout(Arc<str>),
#[error("{0} Failed with {1}")]
Status(String, ExitStatus),
Status(Arc<str>, ExitStatus),
#[error("Unknown process error")]
Other(#[source] std::io::Error),
@ -136,10 +139,14 @@ impl Process {
where
T: AsRef<OsStr>,
{
let command: Arc<str> = Arc::from(String::from(command));
let res = tracing::trace_span!(parent: None, "Create command", %command).in_scope(|| {
Self::spawn(
command,
Command::new(command).args(args).envs(envs.iter().copied()),
command.clone(),
Command::new(command.as_ref())
.args(args)
.envs(envs.iter().copied()),
timeout,
)
});
@ -147,9 +154,9 @@ impl Process {
match res {
Ok(this) => Ok(this),
Err(e) => match e.kind() {
std::io::ErrorKind::NotFound => Err(ProcessError::NotFound(command.to_string())),
std::io::ErrorKind::NotFound => Err(ProcessError::NotFound(command)),
std::io::ErrorKind::PermissionDenied => {
Err(ProcessError::PermissionDenied(command.to_string()))
Err(ProcessError::PermissionDenied(command))
}
std::io::ErrorKind::WouldBlock => Err(ProcessError::LimitReached),
_ => Err(ProcessError::Other(e)),
@ -157,9 +164,9 @@ impl Process {
}
}
fn spawn(command: &str, cmd: &mut Command, timeout: u64) -> std::io::Result<Self> {
fn spawn(command: Arc<str>, cmd: &mut Command, timeout: u64) -> std::io::Result<Self> {
tracing::trace_span!(parent: None, "Spawn command", %command).in_scope(|| {
let guard = MetricsGuard::guard(command.into());
let guard = MetricsGuard::guard(command.clone());
let cmd = cmd
.stdin(Stdio::piped())
@ -168,20 +175,22 @@ impl Process {
cmd.spawn().map(|child| Process {
child,
command: String::from(command),
command,
guard,
timeout: Duration::from_secs(timeout),
id: Uuid::now_v7(),
})
})
}
#[tracing::instrument(skip(self))]
#[tracing::instrument(skip(self), fields(command = %self.command, id = %self.id))]
pub(crate) async fn wait(self) -> Result<(), ProcessError> {
let Process {
command,
mut child,
guard,
timeout,
id: _,
} = self;
let res = child.wait().with_timeout(timeout).await;
@ -226,52 +235,44 @@ impl Process {
mut child,
guard,
timeout,
id,
} = self;
let stdin = child.stdin.take().expect("stdin exists");
let stdout = child.stdout.take().expect("stdout exists");
let background_span =
tracing::info_span!(parent: None, "Background process task", %command);
background_span.follows_from(Span::current());
let handle = Box::pin(async move {
let child_fut = async {
(f)(stdin).await?;
let span = tracing::info_span!(parent: None, "Foreground process task", %command);
span.follows_from(Span::current());
child.wait().await
};
let handle = crate::sync::spawn(
"await-process",
async move {
let child_fut = async {
(f)(stdin).await?;
let error = match child_fut.with_timeout(timeout).await {
Ok(Ok(status)) if status.success() => {
guard.disarm();
return Ok(());
}
Ok(Ok(status)) => {
std::io::Error::new(std::io::ErrorKind::Other, StatusError(status))
}
Ok(Err(e)) => e,
Err(_) => std::io::ErrorKind::TimedOut.into(),
};
child.wait().await
};
child.kill().await?;
let error = match child_fut.with_timeout(timeout).await {
Ok(Ok(status)) if status.success() => {
guard.disarm();
return Ok(());
}
Ok(Ok(status)) => {
std::io::Error::new(std::io::ErrorKind::Other, StatusError(status))
}
Ok(Err(e)) => e,
Err(_) => std::io::ErrorKind::TimedOut.into(),
};
child.kill().await?;
Err(error)
}
.instrument(background_span),
);
Err(error)
});
ProcessRead {
inner: stdout,
handle: DropHandle { inner: handle },
stdout,
handle,
closed: false,
state: ProcessReadState::new_woken(),
span,
span: None,
command,
id,
}
}
}
@ -345,14 +346,19 @@ impl AsyncRead for ProcessRead {
cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<std::io::Result<()>> {
let span = self.span.clone();
let command = self.command.clone();
let id = self.id;
let span = self
.span
.get_or_insert_with(|| tracing::info_span!("process task", %command, %id))
.clone();
let guard = span.enter();
let value = loop {
// always poll for bytes when poll_read is called
let before_size = buf.filled().len();
if let Poll::Ready(res) = Pin::new(&mut self.inner).poll_read(cx, buf) {
if let Poll::Ready(res) = Pin::new(&mut self.stdout).poll_read(cx, buf) {
if let Err(e) = res {
self.closed = true;
@ -368,11 +374,10 @@ impl AsyncRead for ProcessRead {
// only poll handle if we've been explicitly woken
let mut handle_cx = Context::from_waker(&waker);
if let Poll::Ready(res) = Pin::new(&mut self.handle.inner).poll(&mut handle_cx) {
if let Poll::Ready(res) = Pin::new(&mut self.handle).poll(&mut handle_cx) {
let error = match res {
Ok(Ok(())) => continue,
Ok(Err(e)) => e,
Err(e) => std::io::Error::new(std::io::ErrorKind::Other, e),
Ok(()) => continue,
Err(e) => e,
};
self.closed = true;
@ -398,12 +403,6 @@ impl AsyncRead for ProcessRead {
}
}
impl Drop for DropHandle {
fn drop(&mut self) {
self.inner.abort();
}
}
impl Wake for ProcessReadWaker {
fn wake(self: Arc<Self>) {
match Arc::try_unwrap(self) {

4
src/queue/cleanup.rs
View file

@ -236,7 +236,7 @@ where
let span = tracing::info_span!(parent: current_span, "error-boundary");
let res = crate::sync::spawn(
let res = crate::sync::abort_on_drop(crate::sync::spawn(
"prune-missing",
async move {
let mut count = count;
@ -261,7 +261,7 @@ where
Ok(count) as Result<u64, Error>
}
.instrument(span),
)
))
.await;
match res {

36
src/queue/process.rs
View file

@ -1,5 +1,6 @@
use reqwest_middleware::ClientWithMiddleware;
use time::Instant;
use tracing::{Instrument, Span};
use crate::{
concurrent_processor::ProcessMap,
@ -135,23 +136,30 @@ where
let repo = repo.clone();
let client = client.clone();
let current_span = Span::current();
let span = tracing::info_span!(parent: current_span, "error_boundary");
let config = config.clone();
let error_boundary = crate::sync::spawn("ingest-media", async move {
let stream = crate::stream::from_err(store2.to_stream(&ident, None, None).await?);
let error_boundary = crate::sync::abort_on_drop(crate::sync::spawn(
"ingest-media",
async move {
let stream = crate::stream::from_err(store2.to_stream(&ident, None, None).await?);
let session = crate::ingest::ingest(
&tmp_dir,
&repo,
&store2,
&client,
stream,
declared_alias,
&config,
)
.await?;
let session = crate::ingest::ingest(
&tmp_dir,
&repo,
&store2,
&client,
stream,
declared_alias,
&config,
)
.await?;
Ok(session) as Result<Session, Error>
})
Ok(session) as Result<Session, Error>
}
.instrument(span),
))
.await;
store.remove(&unprocessed_identifier).await?;

9
src/repo/postgres.rs
View file

@ -33,6 +33,7 @@ use crate::{
future::{WithMetrics, WithTimeout},
serde_str::Serde,
stream::LocalBoxStream,
sync::DropHandle,
};
use self::job_status::JobStatus;
@ -49,7 +50,7 @@ use super::{
pub(crate) struct PostgresRepo {
inner: Arc<Inner>,
#[allow(dead_code)]
notifications: Arc<tokio::task::JoinHandle<()>>,
notifications: Arc<DropHandle<()>>,
}
struct Inner {
@ -151,7 +152,7 @@ impl PostgresRepo {
.await
.map_err(ConnectPostgresError::ConnectForMigration)?;
let handle = crate::sync::spawn("postgres-migrations", conn);
let handle = crate::sync::abort_on_drop(crate::sync::spawn("postgres-migrations", conn));
embedded::migrations::runner()
.run_async(&mut client)
@ -199,10 +200,10 @@ impl PostgresRepo {
upload_notifications: DashMap::new(),
});
let handle = crate::sync::spawn(
let handle = crate::sync::abort_on_drop(crate::sync::spawn(
"postgres-delegate-notifications",
delegate_notifications(rx, inner.clone(), parallelism * 8),
);
));
let notifications = Arc::new(handle);

4
src/store/object_store.rs
View file

@ -298,7 +298,7 @@ impl Store for ObjectStore {
let object_id2 = object_id.clone();
let upload_id2 = upload_id.to_string();
let handle = crate::sync::spawn(
let handle = crate::sync::abort_on_drop(crate::sync::spawn(
"upload-multipart-part",
async move {
let response = this
@ -333,7 +333,7 @@ impl Store for ObjectStore {
Ok(etag) as Result<String, StoreError>
}
.instrument(tracing::Span::current()),
);
));
futures.push(handle);
}

4
src/stream.rs
View file

@ -30,7 +30,7 @@ where
{
let (tx, rx) = crate::sync::channel(1);
let handle = crate::sync::spawn("send-stream", async move {
let handle = crate::sync::abort_on_drop(crate::sync::spawn("send-stream", async move {
let stream = std::pin::pin!(stream);
let mut streamer = stream.into_streamer();
@ -39,7 +39,7 @@ where
break;
}
}
});
}));
streem::from_fn(|yiedler| async move {
let mut stream = rx.into_stream().into_streamer();

36
src/sync.rs
View file

@ -1,6 +1,40 @@
use std::sync::Arc;
use tokio::sync::{Notify, Semaphore};
use tokio::{
sync::{Notify, Semaphore},
task::JoinHandle,
};
pub(crate) struct DropHandle<T> {
handle: JoinHandle<T>,
}
pub(crate) fn abort_on_drop<T>(handle: JoinHandle<T>) -> DropHandle<T> {
DropHandle { handle }
}
impl<T> DropHandle<T> {
pub(crate) fn abort(&self) {
self.handle.abort();
}
}
impl<T> Drop for DropHandle<T> {
fn drop(&mut self) {
self.handle.abort();
}
}
impl<T> std::future::Future for DropHandle<T> {
type Output = <JoinHandle<T> as std::future::Future>::Output;
fn poll(
mut self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Self::Output> {
std::pin::Pin::new(&mut self.handle).poll(cx)
}
}
#[track_caller]
pub(crate) fn channel<T>(bound: usize) -> (flume::Sender<T>, flume::Receiver<T>) {