Struct futures::io::BufReader

source ·
pub struct BufReader<R> { /* private fields */ }
Expand description

The BufReader struct adds buffering to any reader.

It can be excessively inefficient to work directly with a AsyncRead instance. A BufReader performs large, infrequent reads on the underlying AsyncRead and maintains an in-memory buffer of the results.

BufReader can improve the speed of programs that make small and repeated read calls to the same file or network socket. It does not help when reading very large amounts at once, or reading just one or a few times. It also provides no advantage when reading from a source that is already in memory, like a Vec<u8>.

When the BufReader is dropped, the contents of its buffer will be discarded. Creating multiple instances of a BufReader on the same stream can cause data loss.

Implementations§

source§

impl<R> BufReader<R>where R: AsyncRead,

source

pub fn new(inner: R) -> BufReader<R>

Creates a new BufReader with a default buffer capacity. The default is currently 8 KB, but may change in the future.

source

pub fn with_capacity(capacity: usize, inner: R) -> BufReader<R>

Creates a new BufReader with the specified buffer capacity.

source

pub fn get_ref(&self) -> &R

Acquires a reference to the underlying sink or stream that this combinator is pulling from.

source

pub fn get_mut(&mut self) -> &mut R

Acquires a mutable reference to the underlying sink or stream that this combinator is pulling from.

Note that care must be taken to avoid tampering with the state of the sink or stream which may otherwise confuse this combinator.

source

pub fn get_pin_mut(self: Pin<&mut BufReader<R>>) -> Pin<&mut R>

Acquires a pinned mutable reference to the underlying sink or stream that this combinator is pulling from.

Note that care must be taken to avoid tampering with the state of the sink or stream which may otherwise confuse this combinator.

source

pub fn into_inner(self) -> R

Consumes this combinator, returning the underlying sink or stream.

Note that this may discard intermediate state of this combinator, so care should be taken to avoid losing resources when this is called.

source

pub fn buffer(&self) -> &[u8]

Returns a reference to the internally buffered data.

Unlike fill_buf, this will not attempt to fill the buffer if it is empty.

source§

impl<R> BufReader<R>where R: AsyncRead + AsyncSeek,

source

pub fn seek_relative( self: Pin<&mut BufReader<R>>, offset: i64 ) -> SeeKRelative<'_, R>

Seeks relative to the current position. If the new position lies within the buffer, the buffer will not be flushed, allowing for more efficient seeks. This method does not return the location of the underlying reader, so the caller must track this information themselves if it is required.

source

pub fn poll_seek_relative( self: Pin<&mut BufReader<R>>, cx: &mut Context<'_>, offset: i64 ) -> Poll<Result<(), Error>>

Attempts to seek relative to the current position. If the new position lies within the buffer, the buffer will not be flushed, allowing for more efficient seeks. This method does not return the location of the underlying reader, so the caller must track this information themselves if it is required.

Trait Implementations§

source§

impl<R> AsyncBufRead for BufReader<R>where R: AsyncRead,

source§

fn poll_fill_buf( self: Pin<&mut BufReader<R>>, cx: &mut Context<'_> ) -> Poll<Result<&[u8], Error>>

Attempt to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty. Read more
source§

fn consume(self: Pin<&mut BufReader<R>>, amt: usize)

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to poll_read. Read more
source§

impl<R> AsyncRead for BufReader<R>where R: AsyncRead,

source§

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

Attempt to read from the AsyncRead into buf. Read more
source§

fn poll_read_vectored( self: Pin<&mut BufReader<R>>, cx: &mut Context<'_>, bufs: &mut [IoSliceMut<'_>] ) -> Poll<Result<usize, Error>>

Attempt to read from the AsyncRead into bufs using vectored IO operations. Read more
source§

impl<R> AsyncSeek for BufReader<R>where R: AsyncRead + AsyncSeek,

source§

fn poll_seek( self: Pin<&mut BufReader<R>>, cx: &mut Context<'_>, pos: SeekFrom ) -> Poll<Result<u64, Error>>

Seek to an offset, in bytes, in the underlying reader.

The position used for seeking with SeekFrom::Current(_) is the position the underlying reader would be at if the BufReader had no internal buffer.

Seeking always discards the internal buffer, even if the seek position would otherwise fall within it. This guarantees that calling .into_inner() immediately after a seek yields the underlying reader at the same position.

To seek without discarding the internal buffer, use BufReader::seek_relative or BufReader::poll_seek_relative.

See AsyncSeek for more details.

Note: In the edge case where you’re seeking with SeekFrom::Current(n) where n minus the internal buffer length overflows an i64, two seeks will be performed instead of one. If the second seek returns Err, the underlying reader will be left at the same position it would have if you called seek with SeekFrom::Current(0).

source§

impl<R> AsyncWrite for BufReader<R>where R: AsyncWrite,

source§

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

Attempt to write bytes from buf into the object. Read more
source§

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

Attempt to write bytes from bufs into the object using vectored IO operations. Read more
source§

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

Attempt to flush the object, ensuring that any buffered data reach their destination. Read more
source§

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

Attempt to close the object. Read more
source§

impl<R> Debug for BufReader<R>where R: Debug,

source§

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

Formats the value using the given formatter. Read more
source§

impl<'__pin, R> Unpin for BufReader<R>where __Origin<'__pin, R>: Unpin,

Auto Trait Implementations§

§

impl<R> RefUnwindSafe for BufReader<R>where R: RefUnwindSafe,

§

impl<R> Send for BufReader<R>where R: Send,

§

impl<R> Sync for BufReader<R>where R: Sync,

§

impl<R> UnwindSafe for BufReader<R>where R: UnwindSafe,

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<R> AsyncBufReadExt for Rwhere R: AsyncBufRead + ?Sized,

source§

fn fill_buf(&mut self) -> FillBuf<'_, Self> where Self: Unpin,

Creates a future which will wait for a non-empty buffer to be available from this I/O object or EOF to be reached. Read more
source§

fn consume_unpin(&mut self, amt: usize)where Self: Unpin,

A convenience for calling AsyncBufRead::consume on Unpin IO types. Read more
source§

fn read_until<'a>( &'a mut self, byte: u8, buf: &'a mut Vec<u8, Global> ) -> ReadUntil<'a, Self> where Self: Unpin,

Creates a future which will read all the bytes associated with this I/O object into buf until the delimiter byte or EOF is reached. This method is the async equivalent to BufRead::read_until. Read more
source§

fn read_line<'a>(&'a mut self, buf: &'a mut String) -> ReadLine<'a, Self> where Self: Unpin,

Creates a future which will read all the bytes associated with this I/O object into buf until a newline (the 0xA byte) or EOF is reached, This method is the async equivalent to BufRead::read_line. Read more
source§

fn lines(self) -> Lines<Self>where Self: Sized,

Returns a stream over the lines of this reader. This method is the async equivalent to BufRead::lines. Read more
source§

impl<R> AsyncReadExt for Rwhere R: AsyncRead + ?Sized,

source§

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
source§

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
source§

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
source§

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
source§

fn read_to_end<'a>( &'a mut self, buf: &'a mut Vec<u8, Global> ) -> ReadToEnd<'a, Self> where Self: Unpin,

Creates a future which will read all the bytes from this AsyncRead. Read more
source§

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
source§

fn split(self) -> (ReadHalf<Self>, WriteHalf<Self>)where Self: AsyncWrite + Sized,

Helper method for splitting this read/write object into two halves. Read more
source§

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
source§

impl<S> AsyncSeekExt for Swhere S: AsyncSeek + ?Sized,

source§

fn seek(&mut self, pos: SeekFrom) -> Seek<'_, Self> where Self: Unpin,

Creates a future which will seek an IO object, and then yield the new position in the object and the object itself. Read more
source§

fn stream_position(&mut self) -> Seek<'_, Self> where Self: Unpin,

Creates a future which will return the current seek position from the start of the stream. Read more
source§

impl<W> AsyncWriteExt for Wwhere W: AsyncWrite + ?Sized,

source§

fn flush(&mut self) -> Flush<'_, Self> where Self: Unpin,

Creates a future which will entirely flush this AsyncWrite. Read more
source§

fn close(&mut self) -> Close<'_, Self> where Self: Unpin,

Creates a future which will entirely close this AsyncWrite.
source§

fn write<'a>(&'a mut self, buf: &'a [u8]) -> Write<'a, Self> where Self: Unpin,

Creates a future which will write bytes from buf into the object. Read more
source§

fn write_vectored<'a>( &'a mut self, bufs: &'a [IoSlice<'a>] ) -> WriteVectored<'a, Self> where Self: Unpin,

Creates a future which will write bytes from bufs into the object using vectored IO operations. Read more
source§

fn write_all<'a>(&'a mut self, buf: &'a [u8]) -> WriteAll<'a, Self> where Self: Unpin,

Write data into this object. Read more
source§

fn into_sink<Item>(self) -> IntoSink<Self, Item>where Item: AsRef<[u8]>, Self: Sized,

Allow using an AsyncWrite as a Sink<Item: AsRef<[u8]>>. Read more
source§

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

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

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

source§

fn into(self) -> U

Calls U::from(self).

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

source§

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

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.