async_read_util

Struct ObservedReader

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pub struct ObservedReader<R, F> { /* private fields */ }
Expand description

An async reader which allows a closure to observe the bytes being read as they are ready. This has use cases such as hashing the output of a reader without interfering with the actual content.

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impl<R, F> ObservedReader<R, F>
where R: AsyncRead, F: FnMut(&[u8]),

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pub fn new(inner: R, f: F) -> Self

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impl<R, F> AsyncRead for ObservedReader<R, F>
where R: AsyncRead, F: FnMut(&[u8]),

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

Attempt to read from the AsyncRead into buf. Read more
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fn poll_read_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &mut [IoSliceMut<'_>], ) -> Poll<Result<usize, Error>>

Attempt to read from the AsyncRead into bufs using vectored IO operations. Read more
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impl<'pin, R, F> Unpin for ObservedReader<R, F>
where PinnedFieldsOf<__ObservedReader<'pin, R, F>>: Unpin,

Auto Trait Implementations§

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impl<R, F> Freeze for ObservedReader<R, F>
where R: Freeze, F: Freeze,

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impl<R, F> RefUnwindSafe for ObservedReader<R, F>
where R: RefUnwindSafe, F: RefUnwindSafe,

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impl<R, F> Send for ObservedReader<R, F>
where R: Send, F: Send,

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impl<R, F> Sync for ObservedReader<R, F>
where R: Sync, F: Sync,

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impl<R, F> UnwindSafe for ObservedReader<R, F>
where R: UnwindSafe, F: UnwindSafe,

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<R> AsyncReadExt for R
where R: AsyncRead + ?Sized,

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fn chain<R>(self, next: R) -> Chain<Self, R>
where Self: Sized, R: AsyncRead,

Creates an adaptor which will chain this stream with another. Read more
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fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Read<'a, Self>
where Self: Unpin,

Tries to read some bytes directly into the given buf in asynchronous manner, returning a future type. Read more
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fn read_vectored<'a>( &'a mut self, bufs: &'a mut [IoSliceMut<'a>], ) -> ReadVectored<'a, Self>
where Self: Unpin,

Creates a future which will read from the AsyncRead into bufs using vectored IO operations. Read more
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fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExact<'a, Self>
where Self: Unpin,

Creates a future which will read exactly enough bytes to fill buf, returning an error if end of file (EOF) is hit sooner. Read more
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fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>
where Self: Unpin,

Creates a future which will read all the bytes from this AsyncRead. Read more
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fn read_to_string<'a>( &'a mut self, buf: &'a mut String, ) -> ReadToString<'a, Self>
where Self: Unpin,

Creates a future which will read all the bytes from this AsyncRead. Read more
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fn split(self) -> (ReadHalf<Self>, WriteHalf<Self>)
where Self: Sized + AsyncWrite,

Helper method for splitting this read/write object into two halves. Read more
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fn take(self, limit: u64) -> Take<Self>
where Self: Sized,

Creates an AsyncRead adapter which will read at most limit bytes from the underlying reader. Read more
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impl<R> AsyncReadUtil for R
where R: AsyncRead,

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fn observe<F>(self, f: F) -> ObservedReader<R, F>
where F: FnMut(&[u8]),

Observe the bytes being read from self using the provided closure. Refer to crate::ObservedReader for more info.
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fn map_read<F>(self, f: F) -> MappedReader<R, F>
where F: FnMut(&[u8], &mut [u8]) -> (usize, usize),

Map the bytes being read from self into a new buffer using the provided closure. Refer to crate::MappedReader for more info.
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fn buffered(self) -> BufReader<R>

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.