Struct opendal::Reader

source · [−]

pub struct Reader { /* private fields */ }

Expand description

Reader is used for reading data from underlying backend.

Lazy Stat

We will fetch the object’s content-length while the first time caller try to seek with SeekFrom::End(pos) and the total size is None.

Implementations

source

impl Reader

source

pub fn new(
 acc: Arc<dyn Accessor>,
 path: &str,
 offset: Option<u64>,
 size: Option<u64>
) -> Self

Trait Implementations

source

impl AsyncRead for Reader

source

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

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

source

impl AsyncSeek for Reader

source

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

Attempt to seek to an offset, in bytes, in a stream. Read more

Auto Trait Implementations

impl !RefUnwindSafe for Reader

impl Send for Reader

impl !Sync for Reader

impl Unpin for Reader

impl !UnwindSafe for Reader

Blanket Implementations

source

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

source

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

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

Creates an adaptor which will chain this stream with another. Read more

fn read(&'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

fn read_vectored(
 &'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

fn read_exact(&'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

fn read_to_end(
 &'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

fn read_to_string(&'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

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

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

fn take(self, limit: u64) -> Take<Self>

Creates an AsyncRead adapter which will read at most limit bytes from the underlying reader. Read more

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

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

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

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

source

impl<T> CompatExt for T

source

fn compat(self) -> Compat<T>

Applies the Compat adapter by value. Read more

source

fn compat_ref(&self) -> Compat<&T>

Applies the Compat adapter by shared reference. Read more

source

fn compat_mut(&mut self) -> Compat<&mut T>

Applies the Compat adapter by mutable reference. Read more

source

impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

source

impl<T> Instrument for T

source

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

source

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

source

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

const: unstable · 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> Same<T> for T

type Output = T

Should always be Self

source

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

source

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

source

impl<T> WithSubscriber for T

source

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

source

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

Struct opendal::Reader

Lazy Stat

Implementations

impl Reader

pub fn new( acc: Arc<dyn Accessor>, path: &str, offset: Option<u64>, size: Option<u64>) -> Self

Trait Implementations

impl AsyncRead for Reader

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

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

impl AsyncSeek for Reader

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

Auto Trait Implementations

impl !RefUnwindSafe for Reader

impl Send for Reader

impl !Sync for Reader

impl Unpin for Reader

impl !UnwindSafe for Reader

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

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

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

fn read_vectored( &'a mut self, bufs: &'a mut [IoSliceMut<'a>]) -> ReadVectored<'a, Self> where Self: Unpin,

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

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

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

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

fn take(self, limit: u64) -> Take<Self>

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

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

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

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

fn borrow(&self) -> &T

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

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

impl<T> CompatExt for T

fn compat(self) -> Compat<T>

fn compat_ref(&self) -> Compat<&T>

fn compat_mut(&mut self) -> Compat<&mut T>

impl<T> From<T> for T

fn from(t: T) -> T

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

fn in_current_span(self) -> Instrumented<Self>

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

fn into(self) -> U

impl<T> Same<T> for T

type Output = T

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

type Error = Infallible

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

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

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

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

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where S: Into<Dispatch>,

fn with_current_subscriber(self) -> WithDispatch<Self>

pub fn new(
acc: Arc<dyn Accessor>,
path: &str,
offset: Option<u64>,
size: Option<u64>
) -> Self

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

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

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

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

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

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

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

fn read_vectored(
&'a mut self,
bufs: &'a mut [IoSliceMut<'a>]
) -> ReadVectored<'a, Self> where
Self: Unpin,

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

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

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

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

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

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

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

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

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

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

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

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

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,