96 lines
3.7 KiB
Rust
96 lines
3.7 KiB
Rust
use std::io;
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use std::path::PathBuf;
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use std::sync::Arc;
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use syndicate::actor::*;
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use syndicate::enclose;
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use syndicate::error::Error;
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use syndicate::relay;
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use syndicate::supervise::{Supervisor, SupervisorConfiguration};
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use tokio::net::UnixListener;
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use tokio::net::UnixStream;
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use crate::language::language;
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use crate::lifecycle;
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use crate::protocol::run_connection;
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use crate::schemas::internal_services::UnixRelayListener;
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use syndicate_macros::during;
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pub fn on_demand(t: &mut Activation, ds: Arc<Cap>, gateway: Arc<Cap>) {
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t.spawn(syndicate::name!("on_demand", module = module_path!()), move |t| {
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Ok(during!(t, ds, language(), <run-service $spec: UnixRelayListener>, |t| {
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Supervisor::start(
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t,
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syndicate::name!(parent: None, "relay", addr = ?spec),
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SupervisorConfiguration::default(),
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enclose!((ds, spec) lifecycle::updater(ds, spec)),
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enclose!((ds, gateway) move |t|
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enclose!((ds, gateway, spec) run(t, ds, gateway, spec))))
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}))
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});
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}
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fn run(t: &mut Activation, ds: Arc<Cap>, gateway: Arc<Cap>, spec: UnixRelayListener) -> ActorResult {
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let path_str = spec.addr.path.clone();
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let parent_span = tracing::Span::current();
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let facet = t.facet.clone();
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t.linked_task(syndicate::name!("listener"), async move {
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let listener = bind_unix_listener(&PathBuf::from(path_str)).await?;
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facet.activate(Account::new(syndicate::name!("readiness")), |t| {
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tracing::info!("listening");
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ds.assert(t, language(), &lifecycle::ready(&spec));
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Ok(())
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})?;
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loop {
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let (stream, _addr) = listener.accept().await?;
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let peer = stream.peer_cred()?;
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Actor::new().boot(
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syndicate::name!(parent: parent_span.clone(), "conn",
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pid = ?peer.pid().unwrap_or(-1),
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uid = peer.uid()),
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enclose!((gateway) |t| Ok(t.linked_task(
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tracing::Span::current(),
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{
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let facet = t.facet.clone();
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async move {
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tracing::info!(protocol = %"unix");
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let (i, o) = stream.into_split();
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run_connection(facet,
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relay::Input::Bytes(Box::pin(i)),
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relay::Output::Bytes(Box::pin(o)),
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gateway)?;
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Ok(LinkedTaskTermination::KeepFacet)
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}
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}))));
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}
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});
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Ok(())
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}
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async fn bind_unix_listener(path: &PathBuf) -> Result<UnixListener, Error> {
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match UnixListener::bind(path) {
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Ok(s) => Ok(s),
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Err(e) if e.kind() == io::ErrorKind::AddrInUse => {
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// Potentially-stale socket file sitting around. Try
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// connecting to it to see if it is alive, and remove it
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// if not.
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match UnixStream::connect(path).await {
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Ok(_probe) => Err(e)?, // Someone's already there! Give up.
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Err(f) if f.kind() == io::ErrorKind::ConnectionRefused => {
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// Try to steal the socket.
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tracing::info!("Cleaning stale socket");
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std::fs::remove_file(path)?;
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Ok(UnixListener::bind(path)?)
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}
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Err(error) => {
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tracing::error!(?error, "Problem while probing potentially-stale socket");
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return Err(e)? // signal the *original* error, not the probe error
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}
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}
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},
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Err(e) => Err(e)?,
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}
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}
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