syndicate-lang
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syndicate-rs
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Split out initial services in syndicate-server

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relay-external-protocol
Tony Garnock-Jones 2 years ago
parent f56c0df10f
commit 0eff672c30
13 changed files with 334 additions and 280 deletions
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8
syndicate-macros/src/lib.rs
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@ -106,6 +106,8 @@ fn compile_pattern(v: &IOValue) -> TokenStream {
let P_: TokenStream = quote!(syndicate::schemas::dataspace_patterns);
#[allow(non_snake_case)]
let V_: TokenStream = quote!(syndicate::value);
#[allow(non_snake_case)]
let MapFromIterator_: TokenStream = quote!(<#V_::Map<_, _> as std::iter::FromIterator<_>>::from_iter);
match v.value() {
Value::Symbol(s) => match s.as_str() {
@ -139,7 +141,7 @@ fn compile_pattern(v: &IOValue) -> TokenStream {
label: #label_stx,
arity: #arity .into(),
}),
members: #V_::Map::from_iter(vec![#(#members),*])
members: #MapFromIterator_(vec![#(#members),*])
})))
}
}
@ -151,7 +153,7 @@ fn compile_pattern(v: &IOValue) -> TokenStream {
ctor: Box::new(#P_::CArr {
arity: #arity .into(),
}),
members: #V_::Map::from_iter(vec![#(#members),*])
members: #MapFromIterator_(vec![#(#members),*])
})))
}
Value::Set(_) =>
@ -164,7 +166,7 @@ fn compile_pattern(v: &IOValue) -> TokenStream {
}).collect::<Vec<_>>();
quote!(#P_::Pattern::DCompound(Box::new(#P_::DCompound::Dict {
ctor: Box::new(#P_::CDict),
members: #V_::Map::from_iter(vec![#(#members),*])
members: #MapFromIterator_(vec![#(#members),*])
})))
}
_ => lit(compile_value(v)),

1
syndicate-server/examples/consumer.rs
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@ -1,4 +1,3 @@
use std::iter::FromIterator;
use std::sync::Arc;
use structopt::StructOpt;

1
syndicate-server/examples/pingpong.rs
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@ -1,4 +1,3 @@
use std::iter::FromIterator;
use std::sync::Arc;
use std::time::SystemTime;

1
syndicate-server/examples/state-consumer.rs
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@ -1,4 +1,3 @@
use std::iter::FromIterator;
use std::sync::Arc;
use structopt::StructOpt;

50
syndicate-server/src/gatekeeper.rs
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@ -0,0 +1,50 @@
use std::sync::Arc;
use syndicate::actor::*;
use syndicate::during::DuringResult;
use syndicate::schemas::gatekeeper;
use syndicate::value::NestedValue;
pub fn handle_resolve(
ds: &mut Arc<Cap>,
t: &mut Activation,
a: gatekeeper::Resolve,
) -> DuringResult<Arc<Cap>> {
use syndicate::schemas::dataspace;
let gatekeeper::Resolve { sturdyref, observer } = a;
let queried_oid = sturdyref.oid.clone();
let handler = syndicate::entity(observer)
.on_asserted(move |observer, t, a: AnyValue| {
let bindings = a.value().to_sequence()?;
let key = bindings[0].value().to_bytestring()?;
let unattenuated_target = bindings[1].value().to_embedded()?;
match sturdyref.validate_and_attenuate(key, unattenuated_target) {
Err(e) => {
tracing::warn!(sturdyref = debug(&AnyValue::from(&sturdyref)),
"sturdyref failed validation: {}", e);
Ok(None)
},
Ok(target) => {
tracing::trace!(sturdyref = debug(&AnyValue::from(&sturdyref)),
target = debug(&target),
"sturdyref resolved");
if let Some(h) = observer.assert(t, AnyValue::domain(target)) {
Ok(Some(Box::new(move |_observer, t| Ok(t.retract(h)))))
} else {
Ok(None)
}
}
}
})
.create_cap(t);
if let Some(oh) = ds.assert(t, &dataspace::Observe {
// TODO: codegen plugin to generate pattern constructors
pattern: syndicate_macros::pattern!("<bind =queried_oid $ $>"),
observer: handler,
}) {
Ok(Some(Box::new(move |_ds, t| Ok(t.retract(oh)))))
} else {
Ok(None)
}
}

277
syndicate-server/src/main.rs
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@ -1,9 +1,3 @@
use futures::SinkExt;
use futures::StreamExt;
use std::future::ready;
use std::io;
use std::iter::FromIterator;
use std::path::PathBuf;
use std::sync::Arc;
@ -11,22 +5,13 @@ use structopt::StructOpt;
use syndicate::actor::*;
use syndicate::dataspace::*;
use syndicate::during::DuringResult;
use syndicate::error::Error;
use syndicate::error::error;
use syndicate::relay;
use syndicate::schemas::internal_protocol::_Any;
use syndicate::schemas::gatekeeper;
use syndicate::sturdy;
use syndicate::value::NestedValue;
use tokio::net::TcpListener;
use tokio::net::TcpStream;
use tokio::net::UnixListener;
use tokio::net::UnixStream;
use tungstenite::Message;
mod gatekeeper;
mod protocol;
mod services;
#[derive(Clone, StructOpt)]
struct ServerConfig {
@ -74,61 +59,35 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
tracing::trace!("startup");
if config.debt_reporter {
Actor::new().boot(syndicate::name!("debt-reporter"), |t| {
t.linked_task(syndicate::name!("tick"), async {
let mut timer = tokio::time::interval(core::time::Duration::from_secs(1));
loop {
timer.tick().await;
for (id, (name, debt)) in syndicate::actor::ACCOUNTS.read().unwrap().iter() {
let _enter = name.enter();
tracing::info!(id, debt = debug(
debt.load(std::sync::atomic::Ordering::Relaxed)));
}
}
});
Ok(())
});
}
Actor::new().boot(syndicate::name!("dataspace"), move |t| {
let ds = Cap::new(&t.create(Dataspace::new()));
{
use syndicate::schemas::gatekeeper;
let key = vec![0; 16];
let sr = sturdy::SturdyRef::mint(_Any::new("syndicate"), &key);
tracing::info!(rootcap = debug(&_Any::from(&sr)));
let sr = sturdy::SturdyRef::mint(AnyValue::new("syndicate"), &key);
tracing::info!(rootcap = debug(&AnyValue::from(&sr)));
tracing::info!(rootcap = display(sr.to_hex()));
ds.assert(t, &gatekeeper::Bind { oid: sr.oid.clone(), key, target: ds.clone() });
}
if config.debt_reporter {
services::debt_reporter::spawn(t);
}
if config.inferior {
let ds = Arc::clone(&ds);
Actor::new().boot(syndicate::name!("parent"), move |t| run_io_relay(
t,
relay::Input::Bytes(Box::pin(tokio::io::stdin())),
relay::Output::Bytes(Box::pin(tokio::io::stdout())),
ds));
services::stdio_relay_listener::spawn(t, Arc::clone(&ds));
}
let gateway = Cap::guard(&t.create(
syndicate::entity(Arc::clone(&ds)).on_asserted(handle_resolve)));
syndicate::entity(Arc::clone(&ds)).on_asserted(gatekeeper::handle_resolve)));
for port in config.ports.clone() {
let gateway = Arc::clone(&gateway);
Actor::new().boot(
syndicate::name!("tcp", port),
move |t| Ok(t.linked_task(syndicate::name!("listener"),
run_tcp_listener(gateway, port))));
services::tcp_relay_listener::spawn(t, Arc::clone(&gateway), port);
}
for path in config.sockets.clone() {
let gateway = Arc::clone(&gateway);
Actor::new().boot(
syndicate::name!("unix", socket = debug(path.to_str().expect("representable UnixListener path"))),
move |t| Ok(t.linked_task(syndicate::name!("listener"),
run_unix_listener(gateway, path))));
services::unix_relay_listener::spawn(t, Arc::clone(&gateway), path);
}
Ok(())
@ -136,213 +95,3 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
Ok(())
}
//---------------------------------------------------------------------------
fn message_error<E: std::fmt::Display>(e: E) -> Error {
error(&e.to_string(), _Any::new(false))
}
fn extract_binary_packets(
r: Result<Message, tungstenite::Error>,
) -> Result<Option<Vec<u8>>, Error> {
match r {
Ok(m) => match m {
Message::Text(_) =>
Err("Text websocket frames are not accepted")?,
Message::Binary(bs) =>
Ok(Some(bs)),
Message::Ping(_) =>
Ok(None), // pings are handled by tungstenite before we see them
Message::Pong(_) =>
Ok(None), // unsolicited pongs are to be ignored
Message::Close(_) =>
Ok(None), // we're about to see the end of the stream, so ignore this
},
Err(e) => Err(message_error(e)),
}
}
#[doc(hidden)]
struct ExitListener;
impl Entity<()> for ExitListener {
fn exit_hook(&mut self, _t: &mut Activation, exit_status: &Arc<ActorResult>) -> ActorResult {
tracing::info!(exit_status = debug(exit_status), "disconnect");
Ok(())
}
}
fn run_io_relay(
t: &mut Activation,
i: relay::Input,
o: relay::Output,
initial_ref: Arc<Cap>,
) -> ActorResult {
let exit_listener = t.create(ExitListener);
t.state.add_exit_hook(&exit_listener);
relay::TunnelRelay::run(t, i, o, Some(initial_ref), None);
Ok(())
}
fn run_connection(
facet: FacetRef,
i: relay::Input,
o: relay::Output,
initial_ref: Arc<Cap>,
) -> ActorResult {
facet.activate(Account::new(syndicate::name!("start-session")),
|t| run_io_relay(t, i, o, initial_ref))
}
async fn detect_protocol(
facet: FacetRef,
stream: TcpStream,
gateway: Arc<Cap>,
addr: std::net::SocketAddr,
) -> ActorResult {
let (i, o) = {
let mut buf = [0; 1]; // peek at the first byte to see what kind of connection to expect
match stream.peek(&mut buf).await? {
1 => match buf[0] {
b'G' /* ASCII 'G' for "GET" */ => {
tracing::info!(protocol = display("websocket"), peer = debug(addr));
let s = tokio_tungstenite::accept_async(stream).await
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
let (o, i) = s.split();
let i = i.filter_map(|r| ready(extract_binary_packets(r).transpose()));
let o = o.sink_map_err(message_error).with(|bs| ready(Ok(Message::Binary(bs))));
(relay::Input::Packets(Box::pin(i)), relay::Output::Packets(Box::pin(o)))
},
_ => {
tracing::info!(protocol = display("raw"), peer = debug(addr));
let (i, o) = stream.into_split();
(relay::Input::Bytes(Box::pin(i)),
relay::Output::Bytes(Box::pin(o /* BufWriter::new(o) */)))
}
}
0 => Err(error("closed before starting", _Any::new(false)))?,
_ => unreachable!()
}
};
run_connection(facet, i, o, gateway)
}
async fn run_tcp_listener(
gateway: Arc<Cap>,
port: u16,
) -> ActorResult {
let listen_addr = format!("0.0.0.0:{}", port);
tracing::info!("Listening on {}", listen_addr);
let listener = TcpListener::bind(listen_addr).await?;
loop {
let (stream, addr) = listener.accept().await?;
let gateway = Arc::clone(&gateway);
let ac = Actor::new();
ac.boot(syndicate::name!(parent: None, "tcp"),
move |t| Ok(t.linked_task(
tracing::Span::current(),
detect_protocol(t.facet.clone(), stream, gateway, addr))));
}
}
async fn run_unix_listener(
gateway: Arc<Cap>,
path: PathBuf,
) -> ActorResult {
let path_str = path.to_str().expect("representable UnixListener path");
tracing::info!("Listening on {:?}", path_str);
let listener = bind_unix_listener(&path).await?;
loop {
let (stream, _addr) = listener.accept().await?;
let peer = stream.peer_cred()?;
let gateway = Arc::clone(&gateway);
Actor::new().boot(
syndicate::name!(parent: None, "unix", pid = debug(peer.pid().unwrap_or(-1)), uid = peer.uid()),
|t| Ok(t.linked_task(
tracing::Span::current(),
{
let facet = t.facet.clone();
async move {
tracing::info!(protocol = display("unix"));
let (i, o) = stream.into_split();
run_connection(facet,
relay::Input::Bytes(Box::pin(i)),
relay::Output::Bytes(Box::pin(o)),
gateway)
}
})));
}
}
async fn bind_unix_listener(path: &PathBuf) -> Result<UnixListener, Error> {
match UnixListener::bind(path) {
Ok(s) => Ok(s),
Err(e) if e.kind() == io::ErrorKind::AddrInUse => {
// Potentially-stale socket file sitting around. Try
// connecting to it to see if it is alive, and remove it
// if not.
match UnixStream::connect(path).await {
Ok(_probe) => Err(e)?, // Someone's already there! Give up.
Err(f) if f.kind() == io::ErrorKind::ConnectionRefused => {
// Try to steal the socket.
tracing::info!("Cleaning stale socket");
std::fs::remove_file(path)?;
Ok(UnixListener::bind(path)?)
}
Err(f) => {
tracing::error!(error = debug(f),
"Problem while probing potentially-stale socket");
return Err(e)? // signal the *original* error, not the probe error
}
}
},
Err(e) => Err(e)?,
}
}
//---------------------------------------------------------------------------
fn handle_resolve(
ds: &mut Arc<Cap>,
t: &mut Activation,
a: gatekeeper::Resolve,
) -> DuringResult<Arc<Cap>> {
use syndicate::schemas::dataspace;
let gatekeeper::Resolve { sturdyref, observer } = a;
let queried_oid = sturdyref.oid.clone();
let handler = syndicate::entity(observer)
.on_asserted(move |observer, t, a: _Any| {
let bindings = a.value().to_sequence()?;
let key = bindings[0].value().to_bytestring()?;
let unattenuated_target = bindings[1].value().to_embedded()?;
match sturdyref.validate_and_attenuate(key, unattenuated_target) {
Err(e) => {
tracing::warn!(sturdyref = debug(&_Any::from(&sturdyref)),
"sturdyref failed validation: {}", e);
Ok(None)
},
Ok(target) => {
tracing::trace!(sturdyref = debug(&_Any::from(&sturdyref)),
target = debug(&target),
"sturdyref resolved");
if let Some(h) = observer.assert(t, _Any::domain(target)) {
Ok(Some(Box::new(move |_observer, t| Ok(t.retract(h)))))
} else {
Ok(None)
}
}
}
})
.create_cap(t);
if let Some(oh) = ds.assert(t, &dataspace::Observe {
// TODO: codegen plugin to generate pattern constructors
pattern: syndicate_macros::pattern!("<bind =queried_oid $ $>"),
observer: handler,
}) {
Ok(Some(Box::new(move |_ds, t| Ok(t.retract(oh)))))
} else {
Ok(None)
}
}

104
syndicate-server/src/protocol.rs
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@ -0,0 +1,104 @@
use futures::SinkExt;
use futures::StreamExt;
use std::future::ready;
use std::io;
use std::sync::Arc;
use syndicate::actor::*;
use syndicate::error::Error;
use syndicate::error::error;
use syndicate::relay;
use syndicate::value::NestedValue;
use tokio::net::TcpStream;
use tungstenite::Message;
struct ExitListener;
impl Entity<()> for ExitListener {
fn exit_hook(&mut self, _t: &mut Activation, exit_status: &Arc<ActorResult>) -> ActorResult {
tracing::info!(exit_status = debug(exit_status), "disconnect");
Ok(())
}
}
pub fn run_io_relay(
t: &mut Activation,
i: relay::Input,
o: relay::Output,
initial_ref: Arc<Cap>,
) -> ActorResult {
let exit_listener = t.create(ExitListener);
t.state.add_exit_hook(&exit_listener);
relay::TunnelRelay::run(t, i, o, Some(initial_ref), None);
Ok(())
}
pub fn run_connection(
facet: FacetRef,
i: relay::Input,
o: relay::Output,
initial_ref: Arc<Cap>,
) -> ActorResult {
facet.activate(Account::new(syndicate::name!("start-session")),
|t| run_io_relay(t, i, o, initial_ref))
}
pub async fn detect_protocol(
facet: FacetRef,
stream: TcpStream,
gateway: Arc<Cap>,
addr: std::net::SocketAddr,
) -> ActorResult {
let (i, o) = {
let mut buf = [0; 1]; // peek at the first byte to see what kind of connection to expect
match stream.peek(&mut buf).await? {
1 => match buf[0] {
b'G' /* ASCII 'G' for "GET" */ => {
tracing::info!(protocol = display("websocket"), peer = debug(addr));
let s = tokio_tungstenite::accept_async(stream).await
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
let (o, i) = s.split();
let i = i.filter_map(|r| ready(extract_binary_packets(r).transpose()));
let o = o.sink_map_err(message_error).with(|bs| ready(Ok(Message::Binary(bs))));
(relay::Input::Packets(Box::pin(i)), relay::Output::Packets(Box::pin(o)))
},
_ => {
tracing::info!(protocol = display("raw"), peer = debug(addr));
let (i, o) = stream.into_split();
(relay::Input::Bytes(Box::pin(i)),
relay::Output::Bytes(Box::pin(o /* BufWriter::new(o) */)))
}
}
0 => Err(error("closed before starting", AnyValue::new(false)))?,
_ => unreachable!()
}
};
run_connection(facet, i, o, gateway)
}
fn message_error<E: std::fmt::Display>(e: E) -> Error {
error(&e.to_string(), AnyValue::new(false))
}
fn extract_binary_packets(
r: Result<Message, tungstenite::Error>,
) -> Result<Option<Vec<u8>>, Error> {
match r {
Ok(m) => match m {
Message::Text(_) =>
Err("Text websocket frames are not accepted")?,
Message::Binary(bs) =>
Ok(Some(bs)),
Message::Ping(_) =>
Ok(None), // pings are handled by tungstenite before we see them
Message::Pong(_) =>
Ok(None), // unsolicited pongs are to be ignored
Message::Close(_) =>
Ok(None), // we're about to see the end of the stream, so ignore this
},
Err(e) => Err(message_error(e)),
}
}

18
syndicate-server/src/services/debt_reporter.rs
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@ -0,0 +1,18 @@
use syndicate::actor::*;
pub fn spawn(t: &mut Activation) {
t.spawn(syndicate::name!("debt-reporter"), |t| {
t.linked_task(syndicate::name!("tick"), async {
let mut timer = tokio::time::interval(core::time::Duration::from_secs(1));
loop {
timer.tick().await;
for (id, (name, debt)) in syndicate::actor::ACCOUNTS.read().unwrap().iter() {
let _enter = name.enter();
tracing::info!(id, debt = debug(
debt.load(std::sync::atomic::Ordering::Relaxed)));
}
}
});
Ok(())
});
}

4
syndicate-server/src/services/mod.rs
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@ -0,0 +1,4 @@
pub mod debt_reporter;
pub mod stdio_relay_listener;
pub mod tcp_relay_listener;
pub mod unix_relay_listener;

14
syndicate-server/src/services/stdio_relay_listener.rs
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@ -0,0 +1,14 @@
use std::sync::Arc;
use syndicate::actor::*;
use syndicate::relay;
use crate::protocol::run_io_relay;
pub fn spawn(t: &mut Activation, ds: Arc<Cap>) {
t.spawn(syndicate::name!("parent"), move |t| run_io_relay(
t,
relay::Input::Bytes(Box::pin(tokio::io::stdin())),
relay::Output::Bytes(Box::pin(tokio::io::stdout())),
ds))
}

29
syndicate-server/src/services/tcp_relay_listener.rs
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@ -0,0 +1,29 @@
use std::sync::Arc;
use syndicate::actor::*;
use tokio::net::TcpListener;
use crate::protocol::detect_protocol;
pub fn spawn(t: &mut Activation, gateway: Arc<Cap>, port: u16) {
t.spawn(syndicate::name!("tcp", port),
move |t| Ok(t.linked_task(syndicate::name!("listener"), run(gateway, port))))
}
pub async fn run(
gateway: Arc<Cap>,
port: u16,
) -> ActorResult {
let listen_addr = format!("0.0.0.0:{}", port);
tracing::info!("Listening on {}", listen_addr);
let listener = TcpListener::bind(listen_addr).await?;
loop {
let (stream, addr) = listener.accept().await?;
let gateway = Arc::clone(&gateway);
Actor::new().boot(syndicate::name!(parent: None, "tcp"),
move |t| Ok(t.linked_task(
tracing::Span::current(),
detect_protocol(t.facet.clone(), stream, gateway, addr))));
}
}

72
syndicate-server/src/services/unix_relay_listener.rs
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@ -0,0 +1,72 @@
use std::io;
use std::path::PathBuf;
use std::sync::Arc;
use syndicate::actor::*;
use syndicate::error::Error;
use syndicate::relay;
use tokio::net::UnixListener;
use tokio::net::UnixStream;
use crate::protocol::run_connection;
pub fn spawn(t: &mut Activation, gateway: Arc<Cap>, path: PathBuf) {
t.spawn(syndicate::name!("unix", socket = debug(path.to_str().expect("representable UnixListener path"))),
|t| Ok(t.linked_task(syndicate::name!("listener!"), run(gateway, path))))
}
pub async fn run(
gateway: Arc<Cap>,
path: PathBuf,
) -> ActorResult {
let path_str = path.to_str().expect("representable UnixListener path");
tracing::info!("Listening on {:?}", path_str);
let listener = bind_unix_listener(&path).await?;
loop {
let (stream, _addr) = listener.accept().await?;
let peer = stream.peer_cred()?;
let gateway = Arc::clone(&gateway);
Actor::new().boot(
syndicate::name!(parent: None, "unix", pid = debug(peer.pid().unwrap_or(-1)), uid = peer.uid()),
|t| Ok(t.linked_task(
tracing::Span::current(),
{
let facet = t.facet.clone();
async move {
tracing::info!(protocol = display("unix"));
let (i, o) = stream.into_split();
run_connection(facet,
relay::Input::Bytes(Box::pin(i)),
relay::Output::Bytes(Box::pin(o)),
gateway)
}
})));
}
}
pub async fn bind_unix_listener(path: &PathBuf) -> Result<UnixListener, Error> {
match UnixListener::bind(path) {
Ok(s) => Ok(s),
Err(e) if e.kind() == io::ErrorKind::AddrInUse => {
// Potentially-stale socket file sitting around. Try
// connecting to it to see if it is alive, and remove it
// if not.
match UnixStream::connect(path).await {
Ok(_probe) => Err(e)?, // Someone's already there! Give up.
Err(f) if f.kind() == io::ErrorKind::ConnectionRefused => {
// Try to steal the socket.
tracing::info!("Cleaning stale socket");
std::fs::remove_file(path)?;
Ok(UnixListener::bind(path)?)
}
Err(f) => {
tracing::error!(error = debug(f),
"Problem while probing potentially-stale socket");
return Err(e)? // signal the *original* error, not the probe error
}
}
},
Err(e) => Err(e)?,
}
}

35
syndicate/src/actor.rs
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@ -765,6 +765,23 @@ impl<'activation> Activation<'activation> {
}
}
fn enqueue_for_myself_at_commit(&mut self, action: Action) {
let mailbox = self.state.mailbox();
self.pending.queue_for_mailbox(&mailbox).push(action);
}
/// Schedule the creation of a new actor when the Activation commits.
pub fn spawn<F: 'static + Send + FnOnce(&mut Activation) -> ActorResult>(
&mut self,
name: tracing::Span,
boot: F,
) {
self.enqueue_for_myself_at_commit(Box::new(move |_| {
Actor::new().boot(name, boot);
Ok(())
}));
}
/// Create a new subfacet of the currently-active facet. Runs `boot` in the new facet's
/// context. If `boot` returns leaving the new facet [inert][Facet#inert-facets],
pub fn facet<F: 'static + Send + FnOnce(&mut Activation) -> ActorResult>(
@ -810,18 +827,16 @@ impl<'activation> Activation<'activation> {
/// yet, none of the shutdown handlers yields an error, and the facet's parent facet is
/// alive, executes `continuation` in the parent facet's context.
pub fn stop_facet(&mut self, facet_id: FacetId, continuation: Option<Action>) {
let mailbox = self.state.mailbox();
let maybe_parent_id = self.active_facet().and_then(|f| f.parent_facet_id);
self.pending.queue_for_mailbox(&mailbox).push(Box::new(
move |t| {
t._terminate_facet(facet_id, true)?;
if let Some(k) = continuation {
if let Some(parent_id) = maybe_parent_id {
t.with_facet(true, parent_id, k)?;
}
self.enqueue_for_myself_at_commit(Box::new(move |t| {
t._terminate_facet(facet_id, true)?;
if let Some(k) = continuation {
if let Some(parent_id) = maybe_parent_id {
t.with_facet(true, parent_id, k)?;
}
Ok(())
}));
}
Ok(())
}));
}
/// Arranges for the active facet to be stopped cleanly when `self` commits.

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