Struct ByteCounter

pub struct ByteCounter<T: AsyncWrite> { /* private fields */ }

An AsyncWrite which counts bytes written to the wrapped AsyncWrite.

      let mut counter = ByteCounter::new(sink());
      counter.write("this is a test".as_bytes()).await?;
      assert_eq!(14, counter.byte_count());

Note

The count is stored as a u128 and unchecked addition is use to increment the count which means wrapping a long running AsyncWrite may lead to an overflow.

Implementations

impl<T: AsyncWrite> ByteCounter<T>

pub fn new(inner: T) -> Self

Returns a new ByteCounter wrapping the inner AsyncWrite, with the byte count initialised to 0.

pub fn byte_count(&self) -> u128

Returns the current count of bytes written into the AsyncWrite.

pub fn into_inner(self) -> T

Returns the inner AsyncWrite, consuming this Self.

Trait Implementations

impl<T: AsyncWrite> AsyncWrite for ByteCounter<T>

fn poll_write( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8], ) -> Poll<Result<usize>>

Attempt to write bytes from buf into the object.

fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempt to flush the object, ensuring that any buffered data reach their destination.

fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempt to close the object.

fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>], ) -> Poll<Result<usize, Error>>

Attempt to write bytes from bufs into the object using vectored IO operations.

impl<T: Debug + AsyncWrite> Debug for ByteCounter<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'__pin, T: AsyncWrite> Unpin for ByteCounter<T>

where PinnedFieldsOf<__Origin<'__pin, T>>: Unpin,