WIP

crates/net/src/connection/confirms.rs

@@ -15,6 +15,8 @@ use tracing::warn;
 use super::{
     book::{Connection, ConnectionBook},
     databuf::DataBuf,
+    pending::{Pending, PendingDrain},
+    received::{IdContinuity, Received, ReceivedIdError},
 };
 use crate::{
     header::{DatagramHeader, PackageId, PackageIdRange},
@@ -27,9 +29,8 @@ use crate::{
 const MAX_BUFF_SIZE: usize = 96;
 /// The buffer is flushed after the oldest part is older than this.
 const MAX_BUFF_AGE: Duration = Duration::from_millis(100);
-// This must be less than `u32::MAX / 2` due to ID ordering circularity issues.
-const MAX_SKIPPED: usize = 1024;
 
+// TODO rename
 #[derive(Clone)]
 pub(crate) struct Confirmations {
     book: Arc<Mutex<ConnectionBook<IdReceiver>>>,
@@ -113,16 +114,18 @@ impl Confirmations {
 }
 
 // TODO rename
-struct IdReceiver {
+struct ReceiveHandler {
     received: Received,
-    buffer: Buffer,
+    pending: Pending,
+    confirms: ConfirmsBuffer,
 }
 
-impl IdReceiver {
+impl ReceiveHandler {
     fn new() -> Self {
         Self {
             received: Received::new(),
-            buffer: Buffer::new(),
+            pending: Pending::new(),
+            confirms: ConfirmsBuffer::new(),
         }
     }
 
@@ -133,181 +136,35 @@ impl IdReceiver {
         time: Instant,
         id: PackageId,
         buf: &mut [u8],
-    ) -> Result<Option<PendingIterator>, ReceivedIdError> {
+    ) -> Result<Option<PendingDrain>, ReceivedIdError> {
         let result = self.received.process(id, buf);
         if let Ok(_) | Err(ReceivedIdError::Duplicate) = result {
-            warn!("AA: {id:?}");
             // Push to the buffer even duplicate packages, because the reason
             // behind the re-delivery might be loss of the confirmation
             // datagram.
-            self.buffer.push(time, id);
-        }
-        result
-    }
-}
-
-impl Connection for IdReceiver {
-    fn pending(&self) -> bool {
-        !self.buffer.is_empty()
-    }
-}
-
-struct Received {
-    highest_id: Option<PackageId>,
-    holes: BTreeSet<PackageId>,
-    pending: Pending,
-}
-
-impl Received {
-    fn new() -> Self {
-        Self {
-            highest_id: None,
-            holes: BTreeSet::new(),
-            pending: Pending::new(),
+            self.confirms.push(time, id);
         }
-    }
-
-    /// Registers package as received and returns delivery order continuity in
-    /// respect with earlier sent packages.
-    // TODO update docs
-    fn process(
-        &mut self,
-        id: PackageId,
-        buf: &mut [u8],
-    ) -> Result<Option<PendingIterator>, ReceivedIdError> {
-        let range_start = match self.highest_id {
-            Some(highest) => match highest.cmp(&id) {
-                Ordering::Less => highest.incremented(),
-                Ordering::Greater => {
-                    if self.holes.remove(&id) {
-                        return Ok(match self.holes.first() {
-                            Some(first) => {
-                                if first.cmp(&id).is_ge() {
-                                    Some(PendingIterator::new(*first, &mut self.pending, buf))
-                                } else {
-                                    None
-                                }
-                            }
-                            None => Some(PendingIterator::new(
-                                highest.incremented(),
-                                &mut self.pending,
-                                buf,
-                            )),
-                        });
-                    } else {
-                        warn!("D: {:?}", id);
-                        return Err(ReceivedIdError::Duplicate);
-                    }
-                }
-                Ordering::Equal => {
-                    warn!("E: {:?}", id);
-                    return Err(ReceivedIdError::Duplicate);
-                }
-            },
-            None => PackageId::zero(),
-        };
-
-        let range = PackageIdRange::range(range_start, id);
-        let skipped = range.size_hint().1.unwrap() + self.holes.len();
-        if skipped > MAX_SKIPPED {
-            return Err(ReceivedIdError::TooManySkipped(skipped));
-        }
-
-        self.highest_id = Some(id);
-        for hole in range {
-            self.holes.insert(hole);
-        }
-
-        Ok(if skipped == 0 {
-            Some(PendingIterator::new(
-                id.incremented(),
-                &mut self.pending,
-                buf,
-            ))
-        } else {
-            None
+        result.map(|continuity| match continuity {
+            IdContinuity::Continuous(bound) => Some(self.pending.drain(bound, buf)),
+            IdContinuity::Sparse => None,
         })
     }
 }
 
-#[derive(Error, Debug, PartialEq, Eq)]
-pub(crate) enum ReceivedIdError {
-    #[error("Duplicate package")]
-    Duplicate,
-    #[error("Too many packages skipped: {0}")]
-    TooManySkipped(usize),
-}
-
-// TODO docs
-// TODO rename
-pub(crate) struct PendingIterator<'a, 'b> {
-    bound: PackageId,
-    pending: &'a mut Pending,
-    buf: &'b mut [u8],
-}
-
-impl<'a, 'b> PendingIterator<'a, 'b> {
-    // TODO docs
-    fn new(bound: PackageId, pending: &'a mut Pending, buf: &'b mut [u8]) -> Self {
-        Self {
-            bound,
-            pending,
-            buf,
-        }
-    }
-}
-
-impl<'a, 'b> Iterator for PendingIterator<'a, 'b> {
-    type Item = usize;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.pending.pop_first(self.bound, self.buf)
-    }
-}
-
-struct Pending {
-    ids: BTreeSet<PackageId>,
-    buf: DataBuf,
-}
-
-impl Pending {
-    fn new() -> Self {
-        Self {
-            ids: BTreeSet::new(),
-            buf: DataBuf::new(),
-        }
-    }
-
-    fn store(&mut self, id: PackageId, data: &[u8]) {
-        if self.ids.insert(id) {
-            self.buf.push(id, data);
-        }
-    }
-
-    // TODO docs (incl panics)
-    fn pop_first(&mut self, bound: PackageId, buf: &mut [u8]) -> Option<usize> {
-        match self.ids.first().copied() {
-            Some(first) => {
-                if first.cmp(&bound).is_ge() {
-                    assert_eq!(first, self.ids.pop_first().unwrap());
-                    self.buf.pop(first, buf)
-                } else {
-                    None
-                }
-            }
-            None => None,
-        }
+impl Connection for ReceiveHandler {
+    fn pending(&self) -> bool {
+        !self.confirms.is_empty()
     }
 }
 
 /// Buffer with datagram confirmations.
-struct Buffer {
+struct ConfirmsBuffer {
     oldest: Instant,
     buffer: Vec<u8>,
     flushed: usize,
 }
 
-impl Buffer {
+impl ConfirmsBuffer {
     fn new() -> Self {
         Self {
             oldest: Instant::now(),
@@ -365,59 +222,10 @@ impl Buffer {
 mod tests {
     use super::*;
 
-    #[test]
-    fn test_received() {
-        let mut received = Received::new();
-
-        // TODO
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 2])),
-        //     Ok(IdContinuity::Sparse)
-        // );
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 1])),
-        //     Ok(IdContinuity::Sparse)
-        // );
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 1])),
-        //     Err(ReceivedIdError::Duplicate)
-        // );
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 0])),
-        //     Ok(IdContinuity::Continuous(PackageId::from_bytes(&[0, 0, 1])))
-        // );
-
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 5])),
-        //     Ok(IdContinuity::Sparse)
-        // );
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 3])),
-        //     Ok(IdContinuity::Continuous(PackageId::from_bytes(&[0, 0, 4])))
-        // );
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 5])),
-        //     Err(ReceivedIdError::Duplicate)
-        // );
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 6])),
-        //     Ok(IdContinuity::Sparse)
-        // );
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[0, 0, 3])),
-        //     Err(ReceivedIdError::Duplicate)
-        // );
-
-        // assert_eq!(
-        //     received.process(PackageId::from_bytes(&[50, 0, 6])),
-        //     Err(ReceivedIdError::TooManySkipped(3276800))
-        // );
-    }
-
     #[test]
     fn test_buffer() {
         let now = Instant::now();
-        let mut buf = Buffer::new();
+        let mut buf = ConfirmsBuffer::new();
 
         assert!(buf.flush(13).is_none());
         assert!(buf.expiration().is_none());

crates/net/src/connection/mod.rs

@@ -4,4 +4,6 @@ pub(crate) use resend::Resends;
 mod book;
 mod confirms;
 mod databuf;
+mod pending;
+mod received;
 mod resend;

crates/net/src/connection/pending.rs

@@ -0,0 +1,66 @@
+use std::collections::BTreeSet;
+
+use super::databuf::DataBuf;
+use crate::header::PackageId;
+
+/// Buffer for packages delivered out-of-order and thus awaiting the right
+/// moment to be delivered.
+pub(super) struct Pending {
+    ids: BTreeSet<PackageId>,
+    buf: DataBuf,
+}
+
+impl Pending {
+    pub(super) fn new() -> Self {
+        Self {
+            ids: BTreeSet::new(),
+            buf: DataBuf::new(),
+        }
+    }
+
+    pub(super) fn store(&mut self, id: PackageId, data: &[u8]) {
+        if self.ids.insert(id) {
+            self.buf.push(id, data);
+        }
+    }
+
+    // TODO docs
+    // TODO test
+    pub(super) fn drain(&mut self, bound: PackageId, buf: &mut [u8]) -> PendingDrain {
+        PendingDrain {
+            bound,
+            pending: self,
+            buf,
+        }
+    }
+
+    // TODO docs (incl panics)
+    fn pop_first(&mut self, bound: PackageId, buf: &mut [u8]) -> Option<usize> {
+        match self.ids.first().copied() {
+            Some(first) => {
+                if first.cmp(&bound).is_lt() {
+                    assert_eq!(first, self.ids.pop_first().unwrap());
+                    self.buf.pop(first, buf)
+                } else {
+                    None
+                }
+            }
+            None => None,
+        }
+    }
+}
+
+// TODO docs
+pub(crate) struct PendingDrain<'a, 'b> {
+    bound: PackageId,
+    pending: &'a mut Pending,
+    buf: &'b mut [u8],
+}
+
+impl<'a, 'b> Iterator for PendingDrain<'a, 'b> {
+    type Item = usize;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.pending.pop_first(self.bound, self.buf)
+    }
+}