pub fn send_body(
        &mut self, conn: &mut super::Connection, stream_id: u64, body: &[u8],
        fin: bool,
    ) -> Result<usize> {
        let mut d = [42; 10];
        let mut b = octets::OctetsMut::with_slice(&mut d);

        // Validate that it is sane to send data on the stream.
        if stream_id % 4 != 0 {
            return Err(Error::FrameUnexpected);
        }

        match self.streams.get(&stream_id) {
            Some(s) =>
                if !s.local_initialized() {
                    return Err(Error::FrameUnexpected);
                },

            None => {
                return Err(Error::FrameUnexpected);
            },
        };

        // Avoid sending 0-length DATA frames when the fin flag is false.
        if body.is_empty() && !fin {
            return Err(Error::Done);
        }

        let overhead = octets::varint_len(frame::DATA_FRAME_TYPE_ID) +
            octets::varint_len(body.len() as u64);

        let stream_cap = match conn.stream_capacity(stream_id) {
            Ok(v) => v,

            Err(e) => {
                if conn.stream_finished(stream_id) {
                    self.streams.remove(&stream_id);
                }

                return Err(e.into());
            },
        };

        if stream_cap < overhead + body.len() {
            // Ensure the peer is notified that the connection or stream is
            // blocked when the stream's capacity is limited by flow control.
            let _ = conn.stream_writable(stream_id, overhead + body.len());
        }

        // Make sure there is enough capacity to send the DATA frame header.
        if stream_cap < overhead {
            return Err(Error::Done);
        }

        // Cap the frame payload length to the stream's capacity.
        let body_len = std::cmp::min(body.len(), stream_cap - overhead);

        // If we can't send the entire body, set the fin flag to false so the
        // application can try again later.
        let fin = if body_len != body.len() { false } else { fin };

        // Again, avoid sending 0-length DATA frames when the fin flag is false.
        if body_len == 0 && !fin {
            return Err(Error::Done);
        }

        b.put_varint(frame::DATA_FRAME_TYPE_ID)?;
        b.put_varint(body_len as u64)?;
        let off = b.off();
        conn.stream_send(stream_id, &d[..off], false)?;

        // Return how many bytes were written, excluding the frame header.
        // Sending body separately avoids unnecessary copy.
        let written = conn.stream_send(stream_id, &body[..body_len], fin)?;

        trace!(
            "{} tx frm DATA stream={} len={} fin={}",
            conn.trace_id(),
            stream_id,
            written,
            fin
        );

        qlog_with_type!(QLOG_FRAME_CREATED, conn.qlog, q, {
            let frame = Http3Frame::Data { raw: None };
            let ev_data = EventData::H3FrameCreated(H3FrameCreated {
                stream_id,
                length: Some(written as u64),
                frame,
                raw: None,
            });

            q.add_event_data_now(ev_data).ok();
        });

        if fin && written == body.len() && conn.stream_finished(stream_id) {
            self.streams.remove(&stream_id);
        }

        Ok(written)
    }
/// Sends an HTTP/3 body chunk on the given stream.
///
/// On success the number of bytes written is returned, or [`Done`] if no
/// bytes could be written (e.g. because the stream is blocked).
///
/// Note that the number of written bytes returned can be lower than the
/// length of the input buffer when the underlying QUIC stream doesn't have
/// enough capacity for the operation to complete.
///
/// When a partial write happens (including when [`Done`] is returned) the
/// application should retry the operation once the stream is reported as
/// writable again.
///
/// [`Done`]: enum.Error.html#variant.Done
Sends an HTTP/3 body chunk on the given stream.
On success the number of bytes written is returned, or [`Done`] if no
bytes could be written .

Note that the number of written bytes returned can be lower than the
length of the input buffer when the underlying QUIC stream doesn't have
enough capacity for the operation to complete.

When a partial write happens (including when [`Done`] is returned) the
application should retry the operation once the stream is reported as
writable again.


Sends an HTTP / 3 body chunk on the given stream . On success the number of bytes written is returned or [ ` Done ` ] if no bytes could be written . Note that the number of written bytes returned can be lower than the length of the input buffer when the underlying QUIC stream doesn ' t have enough capacity for the operation to complete . When a partial write happens ( including when [ ` Done ` ] is returned ) the application should retry the operation once the stream is reported as writable again .
pub fn send_body(
        &mut self, conn: &mut super::Connection, stream_id: u64, body: &[u8],
        fin: bool,
    ) -> Result<usize> {
        let mut d = [42; 10];
        let mut b = octets::OctetsMut::with_slice(&mut d);
        // Validate that it is sane to send data on the stream.
        if stream_id % 4 != 0 {
            return Err(Error::FrameUnexpected);
        }
        match self.streams.get(&stream_id) {
            Some(s) =>
                if !s.local_initialized() {
                    return Err(Error::FrameUnexpected);
                },
            None => {
                return Err(Error::FrameUnexpected);
            },
        };
        // Avoid sending 0-length DATA frames when the fin flag is false.
        if body.is_empty() && !fin {
            return Err(Error::Done);
        }
        let overhead = octets::varint_len(frame::DATA_FRAME_TYPE_ID) +
            octets::varint_len(body.len() as u64);
        let stream_cap = match conn.stream_capacity(stream_id) {
            Ok(v) => v,
            Err(e) => {
                if conn.stream_finished(stream_id) {
                    self.streams.remove(&stream_id);
                }
                return Err(e.into());
            },
        };
        if stream_cap < overhead + body.len() {
            // Ensure the peer is notified that the connection or stream is
            // blocked when the stream's capacity is limited by flow control.
            let _ = conn.stream_writable(stream_id, overhead + body.len());
        }
        // Make sure there is enough capacity to send the DATA frame header.
        if stream_cap < overhead {
            return Err(Error::Done);
        }
        // Cap the frame payload length to the stream's capacity.
        let body_len = std::cmp::min(body.len(), stream_cap - overhead);
        // If we can't send the entire body, set the fin flag to false so the
        // application can try again later.
        let fin = if body_len != body.len() { false } else { fin };
        // Again, avoid sending 0-length DATA frames when the fin flag is false.
        if body_len == 0 && !fin {
            return Err(Error::Done);
        }
        b.put_varint(frame::DATA_FRAME_TYPE_ID)?;
        b.put_varint(body_len as u64)?;
        let off = b.off();
        conn.stream_send(stream_id, &d[..off], false)?;
        // Return how many bytes were written, excluding the frame header.
        // Sending body separately avoids unnecessary copy.
        let written = conn.stream_send(stream_id, &body[..body_len], fin)?;
        trace!(
            "{} tx frm DATA stream={} len={} fin={}",
            conn.trace_id(),
            stream_id,
            written,
            fin
        );
        qlog_with_type!(QLOG_FRAME_CREATED, conn.qlog, q, {
            let frame = Http3Frame::Data { raw: None };
            let ev_data = EventData::H3FrameCreated(H3FrameCreated {
                stream_id,
                length: Some(written as u64),
                frame,
                raw: None,
            });
            q.add_event_data_now(ev_data).ok();
        });
        if fin && written == body.len() && conn.stream_finished(stream_id) {
            self.streams.remove(&stream_id);
        }
        Ok(written)
    }
pub fn send_body ( & mut self , conn : & mut super :: Connection , stream_id : u64 , body : & [ u8 ] , fin : bool , ) -> Result < usize > { let mut d = [ 42 ; 10 ] ; let mut b = octets :: OctetsMut :: with_slice ( & mut d ) ; // Validate that it is sane to send data on the stream. if stream_id % 4 != 0 { return Err ( Error :: FrameUnexpected ) ; } match self . streams . get ( & stream_id ) { Some ( s ) => if ! s . local_initialized ( ) { return Err ( Error :: FrameUnexpected ) ; } , None => { return Err ( Error :: FrameUnexpected ) ; } , } ; // Avoid sending 0-length DATA frames when the fin flag is false. if body . is_empty ( ) && ! fin { return Err ( Error :: Done ) ; } let overhead = octets :: varint_len ( frame :: DATA_FRAME_TYPE_ID ) + octets :: varint_len ( body . len ( ) as u64 ) ; let stream_cap = match conn . stream_capacity ( stream_id ) { Ok ( v ) => v , Err ( e ) => { if conn . stream_finished ( stream_id ) { self . streams . remove ( & stream_id ) ; } return Err ( e . into ( ) ) ; } , } ; if stream_cap < overhead + body . len ( ) { // Ensure the peer is notified that the connection or stream is // blocked when the stream's capacity is limited by flow control. let _ = conn . stream_writable ( stream_id , overhead + body . len ( ) ) ; } // Make sure there is enough capacity to send the DATA frame header. if stream_cap < overhead { return Err ( Error :: Done ) ; } // Cap the frame payload length to the stream's capacity. let body_len = std :: cmp :: min ( body . len ( ) , stream_cap - overhead ) ; // If we can't send the entire body, set the fin flag to false so the // application can try again later. let fin = if body_len != body . len ( ) { false } else { fin } ; // Again, avoid sending 0-length DATA frames when the fin flag is false. if body_len == 0 && ! fin { return Err ( Error :: Done ) ; } b . put_varint ( frame :: DATA_FRAME_TYPE_ID ) ? ; b . put_varint ( body_len as u64 ) ? ; let off = b . off ( ) ; conn . stream_send ( stream_id , & d [ .. off ] , false ) ? ; // Return how many bytes were written, excluding the frame header. // Sending body separately avoids unnecessary copy. let written = conn . stream_send ( stream_id , & body [ .. body_len ] , fin ) ? ; trace ! ( " " conn trace_id ( ) stream_id written fin ) ; qlog_with_type ! ( QLOG_FRAME_CREATED conn qlog q { let frame Http3Frame Data { raw None } let ev_data EventData H3FrameCreated ( H3FrameCreated { stream_id length Some ( written as u64 ) frame raw None } ) q add_event_data_now ( ev_data ) ok ( ) } ) ; if fin && written == body . len ( ) && conn . stream_finished ( stream_id ) { self . streams . remove ( & stream_id ) ; } Ok ( written ) }
Sends an HTTP/3 body chunk on the given stream.
Sends an HTTP / 3 body chunk on the given stream .
&mut self
conn
&mut super::Connection
stream_id
u64
body
&[u8]
fin
bool
&mut self
conn
&mut super::Connection
stream_id
u64
body
&[u8]
fin
bool