252 lines
8 KiB
Rust
252 lines
8 KiB
Rust
use mtp_codec::{CommunicationType, CommunicationValue, DataType, DataValue};
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use mtp_common::{CommunicationError, PipeError};
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use mtp_transport::{PipeReader, PipeWriter, Policy, TransportEvent};
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use std::collections::HashMap;
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use std::sync::Arc;
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use tokio::sync::{Mutex, mpsc};
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/// The sender operations needed by the transport-independent pipe protocol.
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pub trait PipeSender: Clone + Send + Sync + 'static {
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type Writer: tokio::io::AsyncWrite + Send + Unpin + 'static;
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fn send_pipe_message(
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&self,
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message: &CommunicationValue,
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) -> impl std::future::Future<Output = Result<(), CommunicationError>> + Send;
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fn open_pipe_stream(
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&self,
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pipe_id: u32,
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description: &str,
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) -> impl std::future::Future<Output = Result<PipeWriter<Self::Writer>, CommunicationError>> + Send;
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}
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/// The receiver operations needed by the transport-independent pipe protocol.
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pub trait PipeReceiver<P>: Clone + Send + Sync + 'static
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where
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P: tokio::io::AsyncRead + Send + Unpin + 'static,
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{
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fn receive_pipe_event(
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&self,
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) -> impl std::future::Future<Output = Result<TransportEvent<P>, CommunicationError>> + Send;
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}
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impl PipeSender for mtp_transport::Sender {
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type Writer = wtransport::SendStream;
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async fn send_pipe_message(
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&self,
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message: &CommunicationValue,
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) -> Result<(), CommunicationError> {
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self.send(message).await
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}
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async fn open_pipe_stream(
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&self,
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pipe_id: u32,
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description: &str,
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) -> Result<PipeWriter<Self::Writer>, CommunicationError> {
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self.open_pipe(pipe_id, description).await
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}
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}
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impl PipeReceiver<wtransport::RecvStream> for mtp_transport::Receiver {
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async fn receive_pipe_event(
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&self,
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) -> Result<TransportEvent<wtransport::RecvStream>, CommunicationError> {
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self.receive_event().await
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}
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}
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impl<C> PipeSender for mtp_transport::GenericSender<C>
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where
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C: mtp_transport::TransportConnection,
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C::SendStream: tokio::io::AsyncWrite + Send + Unpin + 'static,
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{
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type Writer = C::SendStream;
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async fn send_pipe_message(
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&self,
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message: &CommunicationValue,
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) -> Result<(), CommunicationError> {
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self.send(message).await
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}
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async fn open_pipe_stream(
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&self,
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pipe_id: u32,
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description: &str,
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) -> Result<PipeWriter<Self::Writer>, CommunicationError> {
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self.open_pipe(pipe_id, description).await
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}
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}
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impl<C> PipeReceiver<C::RecvStream> for mtp_transport::GenericReceiver<C>
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where
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C: mtp_transport::TransportConnection,
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C::RecvStream: tokio::io::AsyncRead + Send + Unpin + 'static,
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{
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async fn receive_pipe_event(
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&self,
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) -> Result<TransportEvent<C::RecvStream>, CommunicationError> {
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self.receive_event().await
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}
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}
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pub struct PipeHandle<S: PipeSender> {
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pub(crate) pipe_id: u32,
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pub(crate) description: String,
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pub(crate) sender: S,
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pub(crate) response_rx: tokio::sync::oneshot::Receiver<Result<bool, PipeError>>,
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}
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impl<S: PipeSender> PipeHandle<S> {
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pub fn pipe_id(&self) -> u32 {
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self.pipe_id
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}
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pub fn description(&self) -> &str {
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&self.description
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}
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pub async fn wait(self) -> Result<Option<PipeWriter<S::Writer>>, PipeError> {
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match self.response_rx.await {
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Ok(Ok(true)) => self
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.sender
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.open_pipe_stream(self.pipe_id, &self.description)
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.await
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.map(Some)
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.map_err(PipeError::from),
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Ok(Ok(false)) => Ok(None),
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Ok(Err(error)) => Err(error),
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Err(_) => Err(PipeError::StreamClosed),
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}
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}
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}
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pub struct PipeRequest<S, P> {
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pub(crate) pipe_id: u32,
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pub(crate) description: String,
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pub(crate) sender: S,
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pub(crate) dispatcher: Arc<PipeDispatcher<P>>,
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}
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impl<S, P> PipeRequest<S, P>
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where
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S: PipeSender,
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P: tokio::io::AsyncRead + Send + Unpin + 'static,
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{
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pub fn id(&self) -> u32 {
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self.pipe_id
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}
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pub fn description(&self) -> &str {
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&self.description
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}
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pub async fn accept(self) -> Result<PipeReader<P>, PipeError> {
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let (pipe_tx, pipe_rx) = tokio::sync::oneshot::channel();
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self.dispatcher
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.pending_pipes
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.lock()
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.await
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.insert(self.pipe_id, pipe_tx);
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let response = CommunicationValue::new(CommunicationType::PipeResponse)
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.with_id(self.pipe_id)
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.add_typed_default(DataType::Accepted, DataValue::BoolTrue);
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self.sender
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.send_pipe_message(&response)
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.await
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.map_err(PipeError::from)?;
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tokio::time::timeout(self.dispatcher.policy.read_timeout, pipe_rx)
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.await
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.map_err(|_| PipeError::HandshakeTimeout)?
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.map_err(|_| PipeError::StreamClosed)
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}
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pub async fn deny(self) -> Result<(), PipeError> {
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let response = CommunicationValue::new(CommunicationType::PipeResponse)
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.with_id(self.pipe_id)
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.add_typed_default(DataType::Accepted, DataValue::BoolFalse);
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self.sender
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.send_pipe_message(&response)
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.await
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.map_err(PipeError::from)
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}
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}
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pub(crate) struct PipeDispatcher<P> {
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pub(crate) pending_creations:
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Mutex<HashMap<u32, tokio::sync::oneshot::Sender<Result<bool, PipeError>>>>,
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pub(crate) pending_pipes: Mutex<HashMap<u32, tokio::sync::oneshot::Sender<PipeReader<P>>>>,
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pub(crate) policy: Arc<Policy>,
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}
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pub(crate) async fn run_dispatcher<S, R, P>(
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receiver: R,
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sender: S,
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app_tx: mpsc::Sender<Result<CommunicationValue, CommunicationError>>,
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pipe_req_tx: mpsc::Sender<PipeRequest<S, P>>,
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dispatcher: Arc<PipeDispatcher<P>>,
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) where
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S: PipeSender,
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R: PipeReceiver<P>,
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P: tokio::io::AsyncRead + Send + Unpin + 'static,
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{
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let pipe_req_type = CommunicationType::PipeRequest.try_to_id(&mtp_codec::TypeMap::latest());
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let pipe_resp_type = CommunicationType::PipeResponse.try_to_id(&mtp_codec::TypeMap::latest());
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loop {
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match receiver.receive_pipe_event().await {
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Ok(TransportEvent::Message(message)) => {
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if Some(message.get_type()) == pipe_req_type {
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let request = PipeRequest {
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pipe_id: message.get_id(),
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description: message
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.get_str(DataType::Description)
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.unwrap_or("")
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.to_owned(),
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sender: sender.clone(),
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dispatcher: dispatcher.clone(),
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};
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let _ = pipe_req_tx.send(request).await;
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continue;
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}
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if Some(message.get_type()) == pipe_resp_type {
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let mut pending = dispatcher.pending_creations.lock().await;
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if let Some(reply) = pending.remove(&message.get_id()) {
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let _ =
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reply.send(Ok(message.get_bool(DataType::Accepted).unwrap_or(false)));
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}
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continue;
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}
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if app_tx.send(Ok(message)).await.is_err() {
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break;
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}
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}
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Ok(TransportEvent::Pipe(reader)) => {
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let pipe_id = reader.pipe_id();
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let mut pending = dispatcher.pending_pipes.lock().await;
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if let Some(reply) = pending.remove(&pipe_id) {
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let _ = reply.send(reader);
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continue;
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}
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drop(pending);
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let request = PipeRequest {
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pipe_id,
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description: reader.description().to_owned(),
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sender: sender.clone(),
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dispatcher: dispatcher.clone(),
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};
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let _ = pipe_req_tx.send(request).await;
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}
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Err(error) => {
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if app_tx.send(Err(error)).await.is_err() {
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break;
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}
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}
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}
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}
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}
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