1 files changed, 125 insertions, 0 deletions
diff --git a/src/endpoint.rs b/src/endpoint.rs
new file mode 100644
index 0000000..0e1f5c8
--- /dev/null
+++ b/src/endpoint.rs
@@ -0,0 +1,125 @@
+use std::marker::PhantomData;
+use std::sync::Arc;
+
+use arc_swap::ArcSwapOption;
+use async_trait::async_trait;
+
+use serde::{Deserialize, Serialize};
+
+use crate::error::Error;
+use crate::netapp::*;
+use crate::proto::*;
+use crate::util::*;
+
+/// This trait should be implemented by all messages your application
+/// wants to handle (click to read more).
+pub trait Message: Serialize + for<'de> Deserialize<'de> + Send + Sync {
+	type Response: Serialize + for<'de> Deserialize<'de> + Send + Sync;
+}
+
+pub(crate) type DynEndpoint = Box<dyn GenericEndpoint + Send + Sync>;
+
+#[async_trait]
+pub trait EndpointHandler<M>: Send + Sync
+where
+	M: Message,
+{
+	async fn handle(self: &Arc<Self>, m: M, from: NodeID) -> M::Response;
+}
+
+pub struct Endpoint<M, H>
+where
+	M: Message,
+	H: EndpointHandler<M>,
+{
+	phantom: PhantomData<M>,
+	netapp: Arc<NetApp>,
+	path: String,
+	handler: ArcSwapOption<H>,
+}
+
+impl<M, H> Endpoint<M, H>
+where
+	M: Message,
+	H: EndpointHandler<M>,
+{
+	pub(crate) fn new(netapp: Arc<NetApp>, path: String) -> Self {
+		Self {
+			phantom: PhantomData::default(),
+			netapp,
+			path,
+			handler: ArcSwapOption::from(None),
+		}
+	}
+	pub fn set_handler(&self, h: Arc<H>) {
+		self.handler.swap(Some(h));
+	}
+	pub async fn call(
+		&self,
+		target: &NodeID,
+		req: M,
+		prio: RequestPriority,
+	) -> Result<<M as Message>::Response, Error> {
+		if *target == self.netapp.id {
+			match self.handler.load_full() {
+				None => Err(Error::NoHandler),
+				Some(h) => Ok(h.handle(req, self.netapp.id).await),
+			}
+		} else {
+			let conn = self
+				.netapp
+				.client_conns
+				.read()
+				.unwrap()
+				.get(target)
+				.cloned();
+			match conn {
+				None => Err(Error::Message(format!(
+					"Not connected: {}",
+					hex::encode(target)
+				))),
+				Some(c) => c.call(req, self.path.as_str(), prio).await,
+			}
+		}
+	}
+}
+
+#[async_trait]
+pub(crate) trait GenericEndpoint {
+	async fn handle(&self, buf: &[u8], from: NodeID) -> Result<Vec<u8>, Error>;
+	fn clear_handler(&self);
+	fn clone_endpoint(&self) -> DynEndpoint;
+}
+
+#[derive(Clone)]
+pub(crate) struct EndpointArc<M, H>(pub(crate) Arc<Endpoint<M, H>>)
+where
+	M: Message,
+	H: EndpointHandler<M>;
+
+#[async_trait]
+impl<M, H> GenericEndpoint for EndpointArc<M, H>
+where
+	M: Message + 'static,
+	H: EndpointHandler<M> + 'static,
+{
+	async fn handle(&self, buf: &[u8], from: NodeID) -> Result<Vec<u8>, Error> {
+		match self.0.handler.load_full() {
+			None => Err(Error::NoHandler),
+			Some(h) => {
+				let req = rmp_serde::decode::from_read_ref::<_, M>(buf)?;
+				let res = h.handle(req, from).await;
+				let res_bytes = rmp_to_vec_all_named(&res)?;
+				Ok(res_bytes)
+			}
+		}
+	}
+
+	fn clear_handler(&self) {
+		self.0.handler.swap(None);
+	}
+
+	fn clone_endpoint(&self) -> DynEndpoint {
+		Box::new(Self(self.0.clone()))
+	}
+}