Store buffered data size as usize (fixes #269) (#542)

src/proto/streams/flow_control.rs

@@ -173,7 +173,7 @@ impl FlowControl {
         );
 
         // Ensure that the argument is correct
-        assert!(sz <= self.window_size);
+        assert!(self.window_size >= sz as usize);
 
         // Update values
         self.window_size -= sz;
@@ -206,38 +206,22 @@ impl Window {
     }
 }
 
-impl PartialEq<WindowSize> for Window {
+impl PartialEq<usize> for Window {
-    fn eq(&self, other: &WindowSize) -> bool {
+    fn eq(&self, other: &usize) -> bool {
         if self.0 < 0 {
             false
         } else {
-            (self.0 as WindowSize).eq(other)
+            (self.0 as usize).eq(other)
         }
     }
 }
 
-impl PartialEq<Window> for WindowSize {
+impl PartialOrd<usize> for Window {
-    fn eq(&self, other: &Window) -> bool {
+    fn partial_cmp(&self, other: &usize) -> Option<::std::cmp::Ordering> {
-        other.eq(self)
-    }
-}
-
-impl PartialOrd<WindowSize> for Window {
-    fn partial_cmp(&self, other: &WindowSize) -> Option<::std::cmp::Ordering> {
         if self.0 < 0 {
             Some(::std::cmp::Ordering::Less)
         } else {
-            (self.0 as WindowSize).partial_cmp(other)
+            (self.0 as usize).partial_cmp(other)
-        }
-    }
-}
-
-impl PartialOrd<Window> for WindowSize {
-    fn partial_cmp(&self, other: &Window) -> Option<::std::cmp::Ordering> {
-        if other.0 < 0 {
-            Some(::std::cmp::Ordering::Greater)
-        } else {
-            self.partial_cmp(&(other.0 as WindowSize))
         }
     }
 }

src/proto/streams/prioritize.rs

@@ -158,7 +158,7 @@ impl Prioritize {
         }
 
         // Update the buffered data counter
-        stream.buffered_send_data += sz;
+        stream.buffered_send_data += sz as usize;
 
         let span =
             tracing::trace_span!("send_data", sz, requested = stream.requested_send_capacity);
@@ -167,9 +167,10 @@ impl Prioritize {
 
         // Implicitly request more send capacity if not enough has been
         // requested yet.
-        if stream.requested_send_capacity < stream.buffered_send_data {
+        if (stream.requested_send_capacity as usize) < stream.buffered_send_data {
             // Update the target requested capacity
-            stream.requested_send_capacity = stream.buffered_send_data;
+            stream.requested_send_capacity =
+                cmp::min(stream.buffered_send_data, WindowSize::MAX as usize) as WindowSize;
 
             self.try_assign_capacity(stream);
         }
@@ -217,28 +218,28 @@ impl Prioritize {
             "reserve_capacity",
             ?stream.id,
             requested = capacity,
-            effective = capacity + stream.buffered_send_data,
+            effective = (capacity as usize) + stream.buffered_send_data,
             curr = stream.requested_send_capacity
         );
         let _e = span.enter();
 
         // Actual capacity is `capacity` + the current amount of buffered data.
         // If it were less, then we could never send out the buffered data.
-        let capacity = capacity + stream.buffered_send_data;
+        let capacity = (capacity as usize) + stream.buffered_send_data;
 
-        if capacity == stream.requested_send_capacity {
+        if capacity == stream.requested_send_capacity as usize {
             // Nothing to do
-        } else if capacity < stream.requested_send_capacity {
+        } else if capacity < stream.requested_send_capacity as usize {
             // Update the target requested capacity
-            stream.requested_send_capacity = capacity;
+            stream.requested_send_capacity = capacity as WindowSize;
 
             // Currently available capacity assigned to the stream
             let available = stream.send_flow.available().as_size();
 
             // If the stream has more assigned capacity than requested, reclaim
             // some for the connection
-            if available > capacity {
+            if available as usize > capacity {
-                let diff = available - capacity;
+                let diff = available - capacity as WindowSize;
 
                 stream.send_flow.claim_capacity(diff);
 
@@ -252,7 +253,8 @@ impl Prioritize {
             }
 
             // Update the target requested capacity
-            stream.requested_send_capacity = capacity;
+            stream.requested_send_capacity =
+                cmp::min(capacity, WindowSize::MAX as usize) as WindowSize;
 
             // Try to assign additional capacity to the stream. If none is
             // currently available, the stream will be queued to receive some
@@ -316,8 +318,8 @@ impl Prioritize {
     /// it to the connection
     pub fn reclaim_reserved_capacity(&mut self, stream: &mut store::Ptr, counts: &mut Counts) {
         // only reclaim requested capacity that isn't already buffered
-        if stream.requested_send_capacity > stream.buffered_send_data {
+        if stream.requested_send_capacity as usize > stream.buffered_send_data {
-            let reserved = stream.requested_send_capacity - stream.buffered_send_data;
+            let reserved = stream.requested_send_capacity - stream.buffered_send_data as WindowSize;
 
             stream.send_flow.claim_capacity(reserved);
             self.assign_connection_capacity(reserved, stream, counts);
@@ -377,7 +379,7 @@ impl Prioritize {
 
         // Total requested should never go below actual assigned
         // (Note: the window size can go lower than assigned)
-        debug_assert!(total_requested >= stream.send_flow.available());
+        debug_assert!(stream.send_flow.available() <= total_requested as usize);
 
         // The amount of additional capacity that the stream requests.
         // Don't assign more than the window has available!
@@ -435,7 +437,7 @@ impl Prioritize {
             has_unavailable = %stream.send_flow.has_unavailable()
         );
 
-        if stream.send_flow.available() < stream.requested_send_capacity
+        if stream.send_flow.available() < stream.requested_send_capacity as usize
             && stream.send_flow.has_unavailable()
         {
             // The stream requires additional capacity and the stream's
@@ -735,8 +737,8 @@ impl Prioritize {
                                 stream.send_flow.send_data(len);
 
                                 // Decrement the stream's buffered data counter
-                                debug_assert!(stream.buffered_send_data >= len);
+                                debug_assert!(stream.buffered_send_data >= len as usize);
-                                stream.buffered_send_data -= len;
+                                stream.buffered_send_data -= len as usize;
                                 stream.requested_send_capacity -= len;
 
                                 // Assign the capacity back to the connection that

src/proto/streams/send.rs

@@ -332,10 +332,10 @@ impl Send {
         let available = stream.send_flow.available().as_size();
         let buffered = stream.buffered_send_data;
 
-        if available <= buffered {
+        if available as usize <= buffered {
             0
         } else {
-            available - buffered
+            available - buffered as WindowSize
         }
     }
 

src/proto/streams/stream.rs

@@ -45,7 +45,7 @@ pub(super) struct Stream {
 
     /// Amount of data buffered at the prioritization layer.
     /// TODO: Technically this could be greater than the window size...
-    pub buffered_send_data: WindowSize,
+    pub buffered_send_data: usize,
 
     /// Task tracking additional send capacity (i.e. window updates).
     send_task: Option<Waker>,