From dd23094007e70592c12aa912f7b156f017ebaef1 Mon Sep 17 00:00:00 2001
From: Dirkjan Ochtman <dirkjan@ochtman.nl>
Date: Wed, 24 Feb 2021 09:44:14 +0100
Subject: [PATCH] quinn-proto: remove unnecessary RecvState::Closed

---
 quinn-proto/src/connection/streams.rs      |  5 ++--
 quinn-proto/src/connection/streams/recv.rs | 29 ++++++++--------------
 2 files changed, 13 insertions(+), 21 deletions(-)

diff --git a/quinn-proto/src/connection/streams.rs b/quinn-proto/src/connection/streams.rs
index a8f3a687a..4cedd7325 100644
--- a/quinn-proto/src/connection/streams.rs
+++ b/quinn-proto/src/connection/streams.rs
@@ -306,7 +306,8 @@ impl Streams {
             return Ok(ShouldTransmit(false));
         }
 
-        let new_bytes = rs.ingest(frame, payload_len, self.data_recvd, self.local_max_data)?;
+        let (new_bytes, closed) =
+            rs.ingest(frame, payload_len, self.data_recvd, self.local_max_data)?;
         self.data_recvd = self.data_recvd.saturating_add(new_bytes);
 
         if !rs.stopped {
@@ -315,7 +316,7 @@ impl Streams {
         }
 
         // Stopped streams become closed instantly on FIN, so check whether we need to clean up
-        if rs.is_closed() {
+        if closed {
             self.recv.remove(&stream);
             self.stream_freed(stream, StreamHalf::Recv);
         }
diff --git a/quinn-proto/src/connection/streams/recv.rs b/quinn-proto/src/connection/streams/recv.rs
index e846bc77e..56a8f658b 100644
--- a/quinn-proto/src/connection/streams/recv.rs
+++ b/quinn-proto/src/connection/streams/recv.rs
@@ -26,13 +26,16 @@ impl Recv {
         }
     }
 
+    /// Process a STREAM frame
+    ///
+    /// Return value is `(number_of_new_bytes_ingested, stream_is_closed)`
     pub(super) fn ingest(
         &mut self,
         frame: frame::Stream,
         payload_len: usize,
         received: u64,
         max_data: u64,
-    ) -> Result<u64, TransportError> {
+    ) -> Result<(u64, bool), TransportError> {
         let end = frame.offset + frame.data.len() as u64;
         if end >= 2u64.pow(62) {
             return Err(TransportError::FLOW_CONTROL_ERROR(
@@ -49,12 +52,10 @@ impl Recv {
 
         let new_bytes = self.credit_consumed_by(end, received, max_data)?;
 
-        if frame.fin {
-            if self.stopped {
-                // Stopped streams don't need to wait for the actual data, they just need to know
-                // how much there was.
-                self.state = RecvState::Closed;
-            } else if let RecvState::Recv { ref mut size } = self.state {
+        // Stopped streams don't need to wait for the actual data, they just need to know
+        // how much there was.
+        if frame.fin && !self.stopped {
+            if let RecvState::Recv { ref mut size } = self.state {
                 *size = Some(end);
             }
         }
@@ -66,7 +67,7 @@ impl Recv {
             self.assembler.set_bytes_read(end);
         }
 
-        Ok(new_bytes)
+        Ok((new_bytes, frame.fin && self.stopped))
     }
 
     pub(super) fn read(&mut self, max_length: usize, ordered: bool) -> StreamReadResult<Chunk> {
@@ -131,13 +132,10 @@ impl Recv {
     fn read_blocked(&mut self) -> Result<(), ReadError> {
         match self.state {
             RecvState::ResetRecvd { error_code, .. } => {
-                self.state = RecvState::Closed;
                 Err(ReadError::Reset(error_code))
             }
-            RecvState::Closed => Err(ReadError::UnknownStream),
             RecvState::Recv { size } => {
                 if size == Some(self.end) && self.assembler.bytes_read() == self.end {
-                    self.state = RecvState::Closed;
                     Ok(())
                 } else {
                     Err(ReadError::Blocked)
@@ -188,16 +186,10 @@ impl Recv {
         matches!(self.state, RecvState::Recv { .. })
     }
 
-    /// All data read by application
-    pub(super) fn is_closed(&self) -> bool {
-        self.state == self::RecvState::Closed
-    }
-
     fn final_offset(&self) -> Option<u64> {
         match self.state {
             RecvState::Recv { size } => size,
             RecvState::ResetRecvd { size, .. } => Some(size),
-            _ => None,
         }
     }
 
@@ -221,7 +213,7 @@ impl Recv {
         }
         self.credit_consumed_by(final_offset.into(), received, max_data)?;
 
-        if matches!(self.state, RecvState::ResetRecvd { .. } | RecvState::Closed) {
+        if matches!(self.state, RecvState::ResetRecvd { .. }) {
             return Ok(false);
         }
         self.state = RecvState::ResetRecvd {
@@ -331,7 +323,6 @@ impl From<IllegalOrderedRead> for ReadError {
 enum RecvState {
     Recv { size: Option<u64> },
     ResetRecvd { size: u64, error_code: VarInt },
-    Closed,
 }
 
 impl Default for RecvState {