lib: expose functions to read DATAGRAM frame queue length and size

3 files changed, 73 insertions, 0 deletions

diff --git a/src/dgram.rs b/src/dgram.rs
index 755d95f2..023df5f4 100644
--- a/src/dgram.rs
+++ b/src/dgram.rs
@@ -99,6 +99,10 @@ impl DatagramQueue {
         self.queue.len() == self.queue_max_len
     }
 
+    pub fn len(&self) -> usize {
+        self.queue.len()
+    }
+
     pub fn byte_size(&self) -> usize {
         self.queue_bytes_size
     }
diff --git a/src/ffi.rs b/src/ffi.rs
index b2476562..edcf7c1e 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -984,6 +984,30 @@ pub extern fn quiche_conn_dgram_recv_front_len(conn: &Connection) -> ssize_t {
 }
 
 #[no_mangle]
+pub extern fn quiche_conn_dgram_recv_queue_len(conn: &Connection) -> ssize_t {
+    conn.dgram_recv_queue_len() as ssize_t
+}
+
+#[no_mangle]
+pub extern fn quiche_conn_dgram_recv_queue_byte_size(
+    conn: &Connection,
+) -> ssize_t {
+    conn.dgram_recv_queue_byte_size() as ssize_t
+}
+
+#[no_mangle]
+pub extern fn quiche_conn_dgram_send_queue_len(conn: &Connection) -> ssize_t {
+    conn.dgram_send_queue_len() as ssize_t
+}
+
+#[no_mangle]
+pub extern fn quiche_conn_dgram_send_queue_byte_size(
+    conn: &Connection,
+) -> ssize_t {
+    conn.dgram_send_queue_byte_size() as ssize_t
+}
+
+#[no_mangle]
 pub extern fn quiche_conn_dgram_send(
     conn: &mut Connection, buf: *const u8, buf_len: size_t,
 ) -> ssize_t {
diff --git a/src/lib.rs b/src/lib.rs
index f1bb2e77..f546acd4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3807,6 +3807,30 @@ impl Connection {
         self.dgram_recv_queue.peek_front_len()
     }
 
+    /// Returns the number of items in the DATAGRAM receive queue.
+    #[inline]
+    pub fn dgram_recv_queue_len(&self) -> usize {
+        self.dgram_recv_queue.len()
+    }
+
+    /// Returns the total size of all items in the DATAGRAM receive queue.
+    #[inline]
+    pub fn dgram_recv_queue_byte_size(&self) -> usize {
+        self.dgram_recv_queue.byte_size()
+    }
+
+    /// Returns the number of items in the DATAGRAM send queue.
+    #[inline]
+    pub fn dgram_send_queue_len(&self) -> usize {
+        self.dgram_send_queue.len()
+    }
+
+    /// Returns the total size of all items in the DATAGRAM send queue.
+    #[inline]
+    pub fn dgram_send_queue_byte_size(&self) -> usize {
+        self.dgram_send_queue.byte_size()
+    }
+
     /// Sends data in a DATAGRAM frame.
     ///
     /// [`Done`] is returned if no data was written.
@@ -9527,15 +9551,33 @@ mod tests {
         let mut pipe = testing::Pipe::with_config(&mut config).unwrap();
         assert_eq!(pipe.handshake(), Ok(()));
 
+        assert_eq!(pipe.client.dgram_send_queue_len(), 0);
+        assert_eq!(pipe.client.dgram_send_queue_byte_size(), 0);
+
         assert_eq!(pipe.client.dgram_send(b"hello, world"), Ok(()));
         assert_eq!(pipe.client.dgram_send(b"ciao, mondo"), Ok(()));
         assert_eq!(pipe.client.dgram_send(b"hola, mundo"), Ok(()));
 
+        assert_eq!(pipe.client.dgram_send_queue_byte_size(), 34);
+
         pipe.client
             .dgram_purge_outgoing(|d: &[u8]| -> bool { d[0] == b'c' });
 
+        assert_eq!(pipe.client.dgram_send_queue_len(), 2);
+        assert_eq!(pipe.client.dgram_send_queue_byte_size(), 23);
+
+        // Before packets exchanged, no dgrams on server receive side.
+        assert_eq!(pipe.server.dgram_recv_queue_len(), 0);
+
         assert_eq!(pipe.advance(), Ok(()));
 
+        // After packets exchanged, no dgrams on client send side.
+        assert_eq!(pipe.client.dgram_send_queue_len(), 0);
+        assert_eq!(pipe.client.dgram_send_queue_byte_size(), 0);
+
+        assert_eq!(pipe.server.dgram_recv_queue_len(), 2);
+        assert_eq!(pipe.server.dgram_recv_queue_byte_size(), 23);
+
         let result1 = pipe.server.dgram_recv(&mut buf);
         assert_eq!(result1, Ok(12));
         assert_eq!(buf[0], b'h');
@@ -9548,6 +9590,9 @@ mod tests {
 
         let result3 = pipe.server.dgram_recv(&mut buf);
         assert_eq!(result3, Err(Error::Done));
+
+        assert_eq!(pipe.server.dgram_recv_queue_len(), 0);
+        assert_eq!(pipe.server.dgram_recv_queue_byte_size(), 0);
     }
 
     #[test]