From 58f9e0a0005aab59dfd987bddb09952f3a5c195b Mon Sep 17 00:00:00 2001
From: Lizzy Fleckenstein <eliasfleckenstein@web.de>
Date: Wed, 15 Feb 2023 23:44:21 +0100
Subject: Add wrappers around mt_rudp

---
 src/conn.rs | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 src/conn.rs

(limited to 'src/conn.rs')

diff --git a/src/conn.rs b/src/conn.rs
new file mode 100644
index 0000000..3fc0e55
--- /dev/null
+++ b/src/conn.rs
@@ -0,0 +1,104 @@
+use super::PktInfo;
+use delegate::delegate;
+use mt_ser::{DefCfg, MtDeserialize, MtSerialize};
+use std::{borrow::Cow, io};
+use thiserror::Error;
+
+pub trait Remote {
+    type UdpSender: mt_rudp::UdpSender;
+    type PktFrom: MtDeserialize;
+    type PktTo: MtSerialize + PktInfo;
+}
+
+#[cfg(feature = "client")]
+pub struct RemoteSrv;
+
+#[cfg(feature = "client")]
+impl Remote for RemoteSrv {
+    type UdpSender = mt_rudp::ToSrv;
+    type PktTo = crate::ToSrvPkt;
+    type PktFrom = crate::ToCltPkt;
+}
+
+#[cfg(feature = "client")]
+pub async fn connect(addr: &str) -> io::Result<(MtSender<RemoteSrv>, MtReceiver<RemoteSrv>)> {
+    let (tx, rx) = mt_rudp::connect(addr).await?;
+    Ok((MtSender(tx), MtReceiver(rx)))
+}
+
+/*
+
+pub struct RemoteClt;
+impl Remote for RemoteClt {
+    type Sender = mt_rudp::ToClt;
+    type To = crate::ToCltPkt;
+    type From = crate::ToSrvPkt;
+}
+
+*/
+
+pub struct MtSender<R: Remote>(pub mt_rudp::RudpSender<R::UdpSender>);
+pub struct MtReceiver<R: Remote>(pub mt_rudp::RudpReceiver<R::UdpSender>);
+
+#[derive(Error, Debug)]
+pub enum RecvError {
+    #[error("connection error: {0}")]
+    ConnError(#[from] mt_rudp::Error),
+    #[error("deserialize error: {0}")]
+    DeserializeError(#[from] mt_ser::DeserializeError),
+}
+
+#[derive(Error, Debug)]
+pub enum SendError {
+    #[error("connection error: {0}")]
+    ConnError(#[from] io::Error),
+    #[error("serialize error: {0}")]
+    SerializeError(#[from] mt_ser::SerializeError),
+}
+
+macro_rules! impl_delegate {
+    ($T:ident) => {
+        impl<R: Remote> $T<R> {
+            delegate! {
+                to self.0 {
+                    pub async fn peer_id(&self) -> u16;
+                    pub async fn is_server(&self) -> bool;
+                    pub async fn close(self);
+                }
+            }
+        }
+    };
+}
+
+impl_delegate!(MtSender);
+impl_delegate!(MtReceiver);
+
+impl<R: Remote> MtReceiver<R> {
+    pub async fn recv(&mut self) -> Option<Result<R::PktFrom, RecvError>> {
+        self.0.recv().await.map(|res| {
+            res.map_err(RecvError::from).and_then(|pkt| {
+                // TODO: warn on trailing data
+                R::PktFrom::mt_deserialize::<DefCfg>(&mut io::Cursor::new(pkt.data))
+                    .map_err(RecvError::from)
+            })
+        })
+    }
+}
+
+impl<R: Remote> MtSender<R> {
+    pub async fn send(&self, pkt: &R::PktTo) -> Result<(), SendError> {
+        let mut writer = Vec::new();
+        pkt.mt_serialize::<DefCfg>(&mut writer)?;
+
+        let (chan, unrel) = pkt.pkt_info();
+        self.0
+            .send(mt_rudp::Pkt {
+                chan,
+                unrel,
+                data: Cow::Borrowed(&writer),
+            })
+            .await?;
+
+        Ok(())
+    }
+}
-- 
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