| 47 | } |
| 48 | |
| 49 | pub async fn read_message<R, T>(reader: &mut R) -> std::io::Result<T> |
| 50 | where |
| 51 | R: AsyncReadExt + Unpin, |
| 52 | T: for<'de> Deserialize<'de>, |
| 53 | { |
| 54 | let mut len_buf = [0u8; 4]; |
| 55 | reader.read_exact(&mut len_buf).await?; |
| 56 | let len = u32::from_be_bytes(len_buf) as usize; |
| 57 | |
| 58 | // Sanity check to prevent OOM |
| 59 | if len > 10 * 1024 * 1024 { |
| 60 | return Err(std::io::Error::new( |
| 61 | std::io::ErrorKind::InvalidData, |
| 62 | "message too large", |
| 63 | )); |
| 64 | } |
| 65 | |
| 66 | let mut payload = vec![0u8; len]; |
| 67 | reader.read_exact(&mut payload).await?; |
| 68 | |
| 69 | rmp_serde::from_slice(&payload) |
| 70 | .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e)) |
| 71 | } |