Make receive_datagram return BytesMut

[TheButlah]

Some use cases, such as using datagrams with serde via tokio_serde::Framed, require that messages received from the peer are BytesMut instead of Bytes. Currently, Connection::receive_datagram() returns a Datagram which itself can only give you Bytes, so the user of the API first needs to clone the data to get exclusive access to a buffer.

It would be nice if receive_datagrams instead returned a BytesMut, providing more performance for use cases like mine where I actually need exclusive access to the buffer.

[BiagioFesta]

It there a way to get a BytesMut from Bytes without copying it?

I am on my phone atm, but considering the underlying QUIC library returns Bytes I am wondering if that's trivially feasible

[TheButlah]

AFAIK, no, there isn't a way. There is a is_unique function, but I don't think it can be used for the purpose of converting to a BytesMut. I could be wrong though.

[BiagioFesta]

I am afraid so. Considering the QUIC connection returns a datagram as Bytes here, the only possibility is to copy the data (even if the Bytes is unique), I guess

[pablosichert]

There's an adjacent issue for this in the Quinn repo: quinn-rs/quinn#1173