640 lines
23 KiB
Rust
640 lines
23 KiB
Rust
use bytes::Buf;
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use bytes::BytesMut;
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use crate::actor::*;
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use crate::during;
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use crate::error::Error;
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use crate::error::error;
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use crate::schemas::gatekeeper;
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use crate::schemas::internal_protocol as P;
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use crate::schemas::sturdy;
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use futures::Sink;
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use futures::SinkExt;
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use futures::Stream;
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use futures::StreamExt;
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use preserves::error::Error as PreservesError;
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use preserves::error::is_eof_io_error;
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use preserves::value::BinarySource;
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use preserves::value::BytesBinarySource;
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use preserves::value::DomainDecode;
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use preserves::value::DomainEncode;
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use preserves::value::IOValue;
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use preserves::value::Map;
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use preserves::value::NestedValue;
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use preserves::value::NoEmbeddedDomainCodec;
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use preserves::value::PackedReader;
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use preserves::value::PackedWriter;
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use preserves::value::Reader;
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use preserves::value::Writer;
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use preserves::value::signed_integer::SignedInteger;
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use preserves_schema::support::Deserialize;
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use preserves_schema::support::ParseError;
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use std::convert::TryFrom;
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use std::io;
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use std::pin::Pin;
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use std::sync::Arc;
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use std::sync::atomic::AtomicUsize;
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use std::sync::atomic::Ordering;
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use tokio::io::AsyncRead;
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use tokio::io::AsyncReadExt;
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use tokio::io::AsyncWrite;
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use tokio::io::AsyncWriteExt;
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use tokio::sync::mpsc::{unbounded_channel, UnboundedSender, UnboundedReceiver};
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enum RelayInput {
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Eof,
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Packet(Vec<u8>),
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Segment(Vec<u8>),
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}
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enum RelayProtocol {
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Input(RelayInput),
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Output(sturdy::Oid, P::Event),
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SyncGc(Arc<Cap>),
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Flush,
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}
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struct WireSymbol {
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oid: sturdy::Oid,
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obj: Arc<Cap>,
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ref_count: AtomicUsize,
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}
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struct Membrane {
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oid_map: Map<sturdy::Oid, Arc<WireSymbol>>,
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ref_map: Map<Arc<Cap>, Arc<WireSymbol>>,
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}
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struct Membranes {
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exported: Membrane,
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imported: Membrane,
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next_export_oid: usize,
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}
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pub enum Input {
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Packets(Pin<Box<dyn Stream<Item = Result<Vec<u8>, Error>> + Send>>),
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Bytes(Pin<Box<dyn AsyncRead + Send>>),
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}
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pub enum Output {
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Packets(Pin<Box<dyn Sink<Vec<u8>, Error = Error> + Send>>),
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Bytes(Pin<Box<dyn AsyncWrite + Send>>),
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}
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type TunnelRelayRef = Arc<Ref<RelayProtocol>>;
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// There are other kinds of relay. This one has exactly two participants connected to each other.
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pub struct TunnelRelay
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{
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self_ref: TunnelRelayRef,
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input_buffer: BytesMut,
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inbound_assertions: Map</* remote */ P::Handle, (/* local */ Handle, Vec<Arc<WireSymbol>>)>,
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outbound_assertions: Map<P::Handle, Vec<Arc<WireSymbol>>>,
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membranes: Membranes,
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pending_outbound: Vec<P::TurnEvent>,
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output: UnboundedSender<LoanedItem<Vec<u8>>>,
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}
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struct RelayEntity {
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relay_ref: TunnelRelayRef,
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oid: sturdy::Oid,
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}
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//---------------------------------------------------------------------------
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impl WireSymbol {
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fn acquire(&self) {
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self.ref_count.fetch_add(1, Ordering::SeqCst);
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}
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fn release(&self) -> bool {
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self.ref_count.fetch_sub(1, Ordering::SeqCst) == 1
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}
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}
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impl Membrane {
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fn new() -> Self {
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Membrane {
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oid_map: Map::new(),
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ref_map: Map::new(),
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}
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}
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fn insert(&mut self, oid: sturdy::Oid, obj: Arc<Cap>) -> Arc<WireSymbol> {
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let ws = Arc::new(WireSymbol {
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oid: oid.clone(),
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obj: Arc::clone(&obj),
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ref_count: AtomicUsize::new(0),
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});
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self.oid_map.insert(oid, Arc::clone(&ws));
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self.ref_map.insert(obj, Arc::clone(&ws));
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ws
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}
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fn acquire(&mut self, r: &Arc<Cap>) -> Arc<WireSymbol> {
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let ws = self.ref_map.get(r).expect("WireSymbol must be present at acquire() time");
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ws.acquire();
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Arc::clone(ws)
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}
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fn release(&mut self, ws: &Arc<WireSymbol>) {
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if ws.release() {
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self.oid_map.remove(&ws.oid);
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self.ref_map.remove(&ws.obj);
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}
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}
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}
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pub fn connect_stream<I, O, E, F>(
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t: &mut Activation,
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i: I,
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o: O,
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sturdyref: sturdy::SturdyRef,
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initial_state: E,
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mut f: F,
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) where
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I: 'static + Send + AsyncRead,
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O: 'static + Send + AsyncWrite,
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E: 'static + Send + std::marker::Sync,
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F: 'static + Send + std::marker::Sync + FnMut(&mut E, &mut Activation, Arc<Cap>) -> during::DuringResult<E>
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{
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let i = Input::Bytes(Box::pin(i));
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let o = Output::Bytes(Box::pin(o));
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let gatekeeper = TunnelRelay::run(t, i, o, None, Some(sturdy::Oid(0.into()))).unwrap();
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let main_entity = t.state.create(during::entity(initial_state).on_asserted(move |state, t, a: _Any| {
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let denotation = a.value().to_embedded()?;
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f(state, t, Arc::clone(denotation))
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}));
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gatekeeper.assert(t, &gatekeeper::Resolve {
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sturdyref,
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observer: Cap::new(&main_entity),
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});
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}
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impl TunnelRelay {
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pub fn run(
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t: &mut Activation,
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i: Input,
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o: Output,
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initial_ref: Option<Arc<Cap>>,
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initial_oid: Option<sturdy::Oid>,
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) -> Option<Arc<Cap>> {
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let (output_tx, output_rx) = unbounded_channel();
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let mut tr = TunnelRelay {
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self_ref: t.state.create_inert(),
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input_buffer: BytesMut::with_capacity(1024),
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output: output_tx,
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inbound_assertions: Map::new(),
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outbound_assertions: Map::new(),
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membranes: Membranes {
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exported: Membrane::new(),
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imported: Membrane::new(),
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next_export_oid: 0,
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},
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pending_outbound: Vec::new(),
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};
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if let Some(ir) = initial_ref {
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tr.membranes.export_ref(ir, true);
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}
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let result = initial_oid.map(
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|io| Arc::clone(&tr.membranes.import_oid(t.state, &tr.self_ref, io).obj));
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let tr_ref = Arc::clone(&tr.self_ref);
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tr_ref.become_entity(tr);
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t.state.add_exit_hook(&tr_ref);
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t.state.linked_task(crate::name!("writer"), output_loop(o, output_rx));
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t.state.linked_task(crate::name!("reader"), input_loop(i, tr_ref));
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result
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}
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fn handle_inbound_packet(&mut self, t: &mut Activation, p: P::Packet) -> ActorResult {
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// tracing::trace!(packet = debug(&p), "-->");
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match p {
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P::Packet::Error(b) => {
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tracing::info!(message = debug(b.message.clone()),
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detail = debug(b.detail.clone()),
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"received Error from peer");
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Err(*b)
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},
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P::Packet::Turn(b) => {
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let P::Turn(events) = *b;
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for P::TurnEvent { oid, event } in events {
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let target = match self.membranes.exported.oid_map.get(&sturdy::Oid(oid.0.clone())) {
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Some(ws) => &ws.obj,
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None => return Err(error("Cannot deliver event: nonexistent oid",
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_Any::from(&P::TurnEvent { oid, event }))),
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};
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match event {
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P::Event::Assert(b) => {
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let P::Assert { assertion: P::Assertion(a), handle: remote_handle } = *b;
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let mut imported = vec![];
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let imported_membrane = &mut self.membranes.imported;
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a.foreach_embedded::<_, Error>(&mut |r| {
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Ok(imported.push(imported_membrane.acquire(r)))
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})?;
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if let Some(local_handle) = target.assert(t, a) {
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if let Some(_) = self.inbound_assertions.insert(remote_handle, (local_handle, imported)) {
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return Err(error("Assertion with duplicate handle", _Any::new(false)));
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}
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}
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}
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P::Event::Retract(b) => {
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let P::Retract { handle: remote_handle } = *b;
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let (local_handle, imported) = match self.inbound_assertions.remove(&remote_handle) {
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None => return Err(error("Retraction of nonexistent handle", _Any::from(&remote_handle))),
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Some(wss) => wss,
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};
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for ws in imported.into_iter() {
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self.membranes.imported.release(&ws);
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}
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t.retract(local_handle);
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}
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P::Event::Message(b) => {
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let P::Message { body: P::Assertion(a) } = *b;
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let imported_membrane = &mut self.membranes.imported;
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a.foreach_embedded(&mut |r| {
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let ws = imported_membrane.acquire(r);
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match ws.ref_count.load(Ordering::SeqCst) {
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1 => Err(error("Cannot receive transient reference", _Any::new(false))),
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_ => Ok(())
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}
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})?;
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target.message(t, a);
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}
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P::Event::Sync(b) => {
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let P::Sync { peer } = *b;
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self.membranes.imported.acquire(&peer);
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struct SyncPeer {
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tr: TunnelRelayRef,
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peer: Arc<Cap>,
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}
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impl Entity<Synced> for SyncPeer {
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fn message(&mut self, t: &mut Activation, _a: Synced) -> ActorResult {
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self.peer.message(t, _Any::new(true));
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t.message(&self.tr, RelayProtocol::SyncGc(
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Arc::clone(&self.peer)));
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Ok(())
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}
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}
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let k = t.state.create(SyncPeer {
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tr: Arc::clone(&self.self_ref),
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peer: Arc::clone(&peer),
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});
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t.sync(&peer.underlying, k);
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}
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}
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}
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t.deliver();
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Ok(())
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}
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}
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}
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fn handle_outbound_event(&mut self, t: &mut Activation, event: P::Event) -> Result<P::Event, Error> {
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match &event {
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P::Event::Assert(b) => {
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let P::Assert { assertion: P::Assertion(a), handle } = &**b;
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let mut outbound = Vec::new();
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a.foreach_embedded::<_, Error>(
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&mut |r| Ok(outbound.push(self.membranes.export_ref(Arc::clone(r), true))))?;
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self.outbound_assertions.insert(handle.clone(), outbound);
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}
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P::Event::Retract(b) => {
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let P::Retract { handle } = &**b;
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if let Some(outbound) = self.outbound_assertions.remove(handle) {
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for ws in outbound.into_iter() {
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self.membranes.exported.release(&ws);
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}
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}
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}
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P::Event::Message(b) => {
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let P::Message { body: P::Assertion(a) } = &**b;
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a.foreach_embedded(&mut |r| {
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let ws = self.membranes.export_ref(Arc::clone(r), false);
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match ws.ref_count.load(Ordering::SeqCst) {
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0 => Err(error("Cannot send transient reference", _Any::new(false))),
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_ => Ok(())
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}
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})?;
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},
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P::Event::Sync(_b) => panic!("TODO not yet implemented"),
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}
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Ok(event)
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}
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fn encode_packet(&mut self, p: P::Packet) -> Result<Vec<u8>, Error> {
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let item = _Any::from(&p);
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// tracing::trace!(packet = debug(&item), "<--");
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Ok(PackedWriter::encode::<_, _Any, _>(&mut self.membranes, &item)?)
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}
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pub fn send_packet(&mut self, debtor: &Arc<Debtor>, cost: usize, p: P::Packet) -> ActorResult {
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let bs = self.encode_packet(p)?;
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let _ = self.output.send(LoanedItem::new(debtor, cost, bs));
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Ok(())
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}
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}
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impl Membranes {
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fn export_ref(&mut self, obj: Arc<Cap>, and_acquire: bool) -> Arc<WireSymbol> {
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let ws = match self.exported.ref_map.get(&obj) {
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None => {
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let oid = sturdy::Oid(SignedInteger::from(self.next_export_oid as u128));
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self.next_export_oid += 1;
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self.exported.insert(oid, obj)
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}
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Some(ws) => Arc::clone(ws)
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};
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if and_acquire {
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ws.acquire();
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}
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ws
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}
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fn import_oid(
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&mut self,
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ac: &mut RunningActor,
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relay_ref: &TunnelRelayRef,
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oid: sturdy::Oid,
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) -> Arc<WireSymbol> {
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let obj = ac.create(RelayEntity { relay_ref: Arc::clone(relay_ref), oid: oid.clone() });
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self.imported.insert(oid, Cap::new(&obj))
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}
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fn decode_embedded<'de, 'src, S: BinarySource<'de>>(
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&mut self,
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t: &mut Activation,
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relay_ref: &TunnelRelayRef,
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src: &'src mut S,
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_read_annotations: bool,
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) -> io::Result<P::_Ptr> {
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let v: IOValue = PackedReader::new(src, NoEmbeddedDomainCodec).demand_next(false)?;
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match sturdy::WireRef::try_from(&v)? {
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sturdy::WireRef::Mine{ oid: b } => {
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let oid = *b;
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match self.imported.oid_map.get(&oid) {
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Some(ws) => Ok(Arc::clone(&ws.obj)),
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None => Ok(Arc::clone(&self.import_oid(t.state, relay_ref, oid).obj)),
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}
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}
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sturdy::WireRef::Yours { oid: b, attenuation } => {
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let oid = *b;
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match self.exported.oid_map.get(&oid) {
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Some(ws) => {
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if attenuation.is_empty() {
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Ok(Arc::clone(&ws.obj))
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} else {
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Ok(ws.obj.attenuate(&sturdy::Attenuation(attenuation))
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.map_err(|e| {
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io::Error::new(
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io::ErrorKind::InvalidInput,
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format!("Invalid capability attenuation: {:?}", e))
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})?)
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}
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}
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None => Ok(Cap::new(&t.state.inert_entity())),
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}
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}
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}
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}
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}
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struct ActivatedMembranes<'a, 'activation, 'm>(&'a mut Activation<'activation>,
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&'m TunnelRelayRef,
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&'m mut Membranes);
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impl<'a, 'activation, 'm> DomainDecode<P::_Ptr> for ActivatedMembranes<'a, 'activation, 'm> {
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fn decode_embedded<'de, 'src, S: BinarySource<'de>>(
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&mut self,
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src: &'src mut S,
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read_annotations: bool,
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) -> io::Result<P::_Ptr> {
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self.2.decode_embedded(self.0, self.1, src, read_annotations)
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}
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}
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impl DomainEncode<P::_Ptr> for Membranes {
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fn encode_embedded<W: Writer>(
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&mut self,
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w: &mut W,
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d: &P::_Ptr,
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) -> io::Result<()> {
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w.write(&mut NoEmbeddedDomainCodec, &_Any::from(&match self.exported.ref_map.get(d) {
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Some(ws) => sturdy::WireRef::Mine {
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oid: Box::new(ws.oid.clone()),
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},
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None => match self.imported.ref_map.get(d) {
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Some(ws) => {
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if d.attenuation.is_empty() {
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sturdy::WireRef::Yours {
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oid: Box::new(ws.oid.clone()),
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attenuation: vec![],
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}
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} else {
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// We may trust the peer to enforce attenuation on our behalf, in
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// which case we can return sturdy::WireRef::Yours with an attenuation
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// attached here, but for now we don't.
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sturdy::WireRef::Mine {
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oid: Box::new(self.export_ref(Arc::clone(d), false).oid.clone()),
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}
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}
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}
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None =>
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sturdy::WireRef::Mine {
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oid: Box::new(self.export_ref(Arc::clone(d), false).oid.clone()),
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},
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}
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}))
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}
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}
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async fn input_loop(
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i: Input,
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relay: TunnelRelayRef,
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) -> ActorResult {
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#[must_use]
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async fn s(
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relay: &TunnelRelayRef,
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debtor: &Arc<Debtor>,
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m: RelayInput,
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) -> ActorResult {
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debtor.ensure_clear_funds().await;
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let relay = Arc::clone(relay);
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external_event(&Arc::clone(&relay.mailbox), debtor, Box::new(
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move |t| relay.with_entity(|e| e.message(t, RelayProtocol::Input(m)))))
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}
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let debtor = Debtor::new(crate::name!("input-loop"));
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match i {
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Input::Packets(mut src) => {
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loop {
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match src.next().await {
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None => {
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s(&relay, &debtor, RelayInput::Eof).await?;
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return Ok(());
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}
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Some(bs) => {
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s(&relay, &debtor, RelayInput::Packet(bs?)).await?;
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}
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}
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}
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}
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Input::Bytes(mut r) => {
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const BUFSIZE: usize = 65536;
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let mut buf = BytesMut::with_capacity(BUFSIZE);
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loop {
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buf.reserve(BUFSIZE);
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let n = match r.read_buf(&mut buf).await {
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Ok(n) => n,
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Err(e) =>
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if e.kind() == io::ErrorKind::ConnectionReset {
|
|
s(&relay, &debtor, RelayInput::Eof).await?;
|
|
return Ok(());
|
|
} else {
|
|
return Err(e)?;
|
|
},
|
|
};
|
|
match n {
|
|
0 => {
|
|
s(&relay, &debtor, RelayInput::Eof).await?;
|
|
return Ok(());
|
|
}
|
|
_ => {
|
|
while buf.has_remaining() {
|
|
let bs = buf.chunk();
|
|
let n = bs.len();
|
|
s(&relay, &debtor, RelayInput::Segment(bs.to_vec())).await?;
|
|
buf.advance(n);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
async fn output_loop(
|
|
mut o: Output,
|
|
mut output_rx: UnboundedReceiver<LoanedItem<Vec<u8>>>,
|
|
) -> ActorResult {
|
|
loop {
|
|
match output_rx.recv().await {
|
|
None =>
|
|
return Ok(()),
|
|
Some(mut loaned_item) => {
|
|
match &mut o {
|
|
Output::Packets(sink) => sink.send(std::mem::take(&mut loaned_item.item)).await?,
|
|
Output::Bytes(w) => {
|
|
w.write_all(&loaned_item.item).await?;
|
|
w.flush().await?;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Entity<RelayProtocol> for TunnelRelay {
|
|
fn message(&mut self, t: &mut Activation, m: RelayProtocol) -> ActorResult {
|
|
match m {
|
|
RelayProtocol::Input(RelayInput::Eof) => {
|
|
t.state.shutdown();
|
|
}
|
|
RelayProtocol::Input(RelayInput::Packet(bs)) => {
|
|
let mut src = BytesBinarySource::new(&bs);
|
|
let mut dec = ActivatedMembranes(t, &self.self_ref, &mut self.membranes);
|
|
let mut r = src.packed::<_, _Any, _>(&mut dec);
|
|
let item = P::Packet::deserialize(&mut r)?;
|
|
self.handle_inbound_packet(t, item)?;
|
|
}
|
|
RelayProtocol::Input(RelayInput::Segment(bs)) => {
|
|
self.input_buffer.extend_from_slice(&bs);
|
|
loop {
|
|
let (e, count) = {
|
|
let mut src = BytesBinarySource::new(&self.input_buffer);
|
|
let mut dec = ActivatedMembranes(t, &self.self_ref, &mut self.membranes);
|
|
let mut r = src.packed::<_, _Any, _>(&mut dec);
|
|
let e = match P::Packet::deserialize(&mut r) {
|
|
Err(ParseError::Preserves(PreservesError::Io(e)))
|
|
if is_eof_io_error(&e) =>
|
|
None,
|
|
result => Some(result?),
|
|
};
|
|
(e, r.source.index)
|
|
};
|
|
match e {
|
|
None => break,
|
|
Some(item) => {
|
|
self.input_buffer.advance(count);
|
|
self.handle_inbound_packet(t, item)?;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
RelayProtocol::Output(oid, event) => {
|
|
if self.pending_outbound.is_empty() {
|
|
t.message_for_myself(&self.self_ref, RelayProtocol::Flush);
|
|
}
|
|
let turn_event = P::TurnEvent {
|
|
oid: P::Oid(oid.0),
|
|
event: self.handle_outbound_event(t, event)?,
|
|
};
|
|
self.pending_outbound.push(turn_event);
|
|
}
|
|
RelayProtocol::SyncGc(peer) => {
|
|
if let Some(ws) = self.membranes.imported.ref_map.get(&peer) {
|
|
let ws = Arc::clone(ws); // cloned to release the borrow to permit the release
|
|
self.membranes.imported.release(&ws);
|
|
}
|
|
}
|
|
RelayProtocol::Flush => {
|
|
let events = std::mem::take(&mut self.pending_outbound);
|
|
self.send_packet(&t.debtor(), events.len(), P::Packet::Turn(Box::new(P::Turn(events))))?
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn exit_hook(&mut self, t: &mut Activation, exit_status: &Arc<ActorResult>) -> ActorResult {
|
|
if let Err(e) = &**exit_status {
|
|
let e = e.clone();
|
|
self.send_packet(&t.debtor(), 1, P::Packet::Error(Box::new(e)))?;
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl Entity<_Any> for RelayEntity {
|
|
fn assert(&mut self, t: &mut Activation, a: _Any, h: Handle) -> ActorResult {
|
|
Ok(t.message(&self.relay_ref, RelayProtocol::Output(
|
|
self.oid.clone(),
|
|
P::Event::Assert(Box::new(P::Assert {
|
|
assertion: P::Assertion(a),
|
|
handle: P::Handle(h.into()),
|
|
})))))
|
|
}
|
|
fn retract(&mut self, t: &mut Activation, h: Handle) -> ActorResult {
|
|
Ok(t.message(&self.relay_ref, RelayProtocol::Output(
|
|
self.oid.clone(),
|
|
P::Event::Retract(Box::new(P::Retract {
|
|
handle: P::Handle(h.into()),
|
|
})))))
|
|
}
|
|
fn message(&mut self, t: &mut Activation, m: _Any) -> ActorResult {
|
|
Ok(t.message(&self.relay_ref, RelayProtocol::Output(
|
|
self.oid.clone(),
|
|
P::Event::Message(Box::new(P::Message { body: P::Assertion(m) })))))
|
|
}
|
|
fn sync(&mut self, t: &mut Activation, peer: Arc<Ref<Synced>>) -> ActorResult {
|
|
Ok(t.message(&self.relay_ref, RelayProtocol::Output(
|
|
self.oid.clone(),
|
|
P::Event::Sync(Box::new(P::Sync { peer: Cap::guard(&peer) })))))
|
|
}
|
|
}
|