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use std::{
collections::HashMap,
pin::Pin,
sync::{RwLock, Weak},
task::{Context, Poll},
};
use exocore_core::{
cell::{Cell, CellId, Node, NodeId},
utils::handle_set::Handle,
};
use futures::{
channel::{mpsc, mpsc::SendError},
prelude::*,
sink::SinkMapErr,
FutureExt, SinkExt,
};
use crate::{
transport::{InEvent, OutEvent, TransportHandleOnStart},
Error, ServiceType, TransportServiceHandle,
};
#[derive(Default)]
pub(super) struct ServiceHandles {
pub(super) service_handles: HashMap<(CellId, ServiceType), ServiceHandle>,
}
impl ServiceHandles {
pub(super) fn push_handle(
&mut self,
cell: Cell,
service_type: ServiceType,
in_sender: mpsc::Sender<InEvent>,
out_receiver: mpsc::Receiver<OutEvent>,
) {
let handle = ServiceHandle {
cell: cell.clone(),
in_sender,
out_receiver: Some(out_receiver),
};
let key = (cell.id().clone(), service_type);
self.service_handles.insert(key, handle);
}
pub(super) fn all_peer_nodes(&self) -> HashMap<NodeId, Node> {
let mut nodes = HashMap::new();
for inner_layer in self.service_handles.values() {
for cell_node in inner_layer.cell.nodes().iter().all_except_local() {
let node = cell_node.node().clone();
nodes.insert(node.id().clone(), node);
}
}
nodes
}
fn remove_handle(&mut self, cell_id: &CellId, layer: ServiceType) {
self.service_handles.remove(&(cell_id.clone(), layer));
}
}
pub(super) struct ServiceHandle {
pub(super) cell: Cell,
pub(super) in_sender: mpsc::Sender<InEvent>,
pub(super) out_receiver: Option<mpsc::Receiver<OutEvent>>,
}
pub struct Libp2pTransportServiceHandle {
pub(super) cell_id: CellId,
pub(super) service_type: ServiceType,
pub(super) inner: Weak<RwLock<ServiceHandles>>,
pub(super) sink: Option<mpsc::Sender<OutEvent>>,
pub(super) stream: Option<mpsc::Receiver<InEvent>>,
pub(super) handle: Handle,
}
impl Libp2pTransportServiceHandle {
pub fn reset(&mut self) {
if let Some(sink) = self.sink.as_mut() {
if let Err(err) = sink.try_send(OutEvent::Reset) {
error!("Fail to send transport reset event: {}", err);
}
} else {
error!("Fail to send transport reset event. Sink was consumed.");
}
}
}
impl TransportServiceHandle for Libp2pTransportServiceHandle {
type Sink = SinkMapErr<mpsc::Sender<OutEvent>, fn(SendError) -> Error>;
type Stream = mpsc::Receiver<InEvent>;
fn on_started(&self) -> TransportHandleOnStart {
Box::new(self.handle.on_set_started())
}
fn get_sink(&mut self) -> Self::Sink {
self.sink
.take()
.expect("Sink was already consumed")
.sink_map_err(|err| Error::Other(format!("Sink error: {}", err)))
}
fn get_stream(&mut self) -> Self::Stream {
self.stream.take().expect("Stream was already consumed")
}
}
impl Future for Libp2pTransportServiceHandle {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
self.handle.on_set_dropped().poll_unpin(cx)
}
}
impl Drop for Libp2pTransportServiceHandle {
fn drop(&mut self) {
debug!(
"Transport handle for cell {} and service {:?} got dropped. Removing it from transport",
self.cell_id, self.service_type
);
if let Some(inner) = self.inner.upgrade() {
if let Ok(mut inner) = inner.write() {
inner.remove_handle(&self.cell_id, self.service_type);
}
}
}
}