pub struct ByteStream { /* private fields */ }
Expand description

Stream of binary data

ByteStream wraps a stream of binary data for ease of use.

Getting data out of a ByteStream

ByteStream provides two primary mechanisms for accessing the data:

  1. With .collect():

    .collect() reads the complete ByteStream into memory and stores it in AggregatedBytes, a non-contiguous ByteBuffer.

    use aws_smithy_http::byte_stream::{ByteStream, AggregatedBytes};
    use aws_smithy_http::body::SdkBody;
    use bytes::Buf;
    async fn example() {
       let stream = ByteStream::new(SdkBody::from("hello! This is some data"));
       // Load data from the stream into memory:
       let data = stream.collect().await.expect("error reading data");
       // collect returns a `bytes::Buf`:
       println!("first chunk: {:?}", data.chunk());
    }
  2. Via impl Stream:

    Note: An import of StreamExt is required to use .try_next().

    For use-cases where holding the entire ByteStream in memory is unnecessary, use the Stream implementation:

    use aws_smithy_http::byte_stream::{ByteStream, AggregatedBytes, error::Error};
    use aws_smithy_http::body::SdkBody;
    use tokio_stream::StreamExt;
    
    async fn example() -> Result<(), Error> {
       let mut stream = ByteStream::from(vec![1, 2, 3, 4, 5, 99]);
       let mut digest = crc32::Digest::new();
       while let Some(bytes) = stream.try_next().await? {
           digest.write(&bytes);
       }
       println!("digest: {}", digest.finish());
       Ok(())
    }
  3. Via .into_async_read():

    Note: The rt-tokio feature must be active to use .into_async_read().

    It’s possible to convert a ByteStream into a struct that implements tokio::io::AsyncRead. Then, you can use pre-existing tools like tokio::io::BufReader:

    use aws_smithy_http::byte_stream::ByteStream;
    use aws_smithy_http::body::SdkBody;
    use tokio::io::{AsyncBufReadExt, BufReader};
    #[cfg(feature = "rt-tokio")]
    async fn example() -> std::io::Result<()> {
       let stream = ByteStream::new(SdkBody::from("hello!\nThis is some data"));
       // Wrap the stream in a BufReader
       let buf_reader = BufReader::new(stream.into_async_read());
       let mut lines = buf_reader.lines();
       assert_eq!(lines.next_line().await?, Some("hello!".to_owned()));
       assert_eq!(lines.next_line().await?, Some("This is some data".to_owned()));
       assert_eq!(lines.next_line().await?, None);
       Ok(())
    }

Getting data into a ByteStream

ByteStreams can be created in one of three ways:

  1. From in-memory binary data: ByteStreams created from in-memory data are always retryable. Data will be converted into Bytes enabling a cheap clone during retries.

    use bytes::Bytes;
    use aws_smithy_http::byte_stream::ByteStream;
    let stream = ByteStream::from(vec![1,2,3]);
    let stream = ByteStream::from(Bytes::from_static(b"hello!"));
  2. From a file: ByteStreams created from a path can be retried. A new file descriptor will be opened if a retry occurs.

    #[cfg(feature = "tokio-rt")]
    use aws_smithy_http::byte_stream::ByteStream;
    let stream = ByteStream::from_path("big_file.csv");
  3. From an SdkBody directly: For more advanced / custom use cases, a ByteStream can be created directly from an SdkBody. When created from an SdkBody, care must be taken to ensure retriability. An SdkBody is retryable when constructed from in-memory data or when using SdkBody::retryable.

    use aws_smithy_http::byte_stream::ByteStream;
    use aws_smithy_http::body::SdkBody;
    use bytes::Bytes;
    let (mut tx, channel_body) = hyper::Body::channel();
    // this will not be retryable because the SDK has no way to replay this stream
    let stream = ByteStream::new(SdkBody::from(channel_body));
    tx.send_data(Bytes::from_static(b"hello world!"));
    tx.send_data(Bytes::from_static(b"hello again!"));
    // NOTE! You must ensure that `tx` is dropped to ensure that EOF is sent

Implementations§

§

impl ByteStream

pub fn new(body: SdkBody) -> ByteStream

Create a new ByteStream from an SdkBody.

pub fn from_static(bytes: &'static [u8]) -> ByteStream

Create a new ByteStream from a static byte slice.

pub fn into_inner(self) -> SdkBody

Consumes the ByteStream, returning the wrapped SdkBody

pub async fn collect(self) -> Result<AggregatedBytes, Error>

Read all the data from this ByteStream into memory

If an error in the underlying stream is encountered, ByteStreamError is returned.

Data is read into an AggregatedBytes that stores data non-contiguously as it was received over the network. If a contiguous slice is required, use into_bytes().

use bytes::Bytes;
use aws_smithy_http::body;
use aws_smithy_http::body::SdkBody;
use aws_smithy_http::byte_stream::{ByteStream, error::Error};
async fn get_data() {
    let stream = ByteStream::new(SdkBody::from("hello!"));
    let data: Result<Bytes, Error> = stream.collect().await.map(|data| data.into_bytes());
}

pub fn read_from() -> FsBuilder

Returns a FsBuilder, allowing you to build a ByteStream with full control over how the file is read (eg. specifying the length of the file or the size of the buffer used to read the file).

use aws_smithy_http::byte_stream::{ByteStream, Length};

async fn bytestream_from_file() -> ByteStream {
    let bytestream = ByteStream::read_from()
        .path("docs/some-large-file.csv")
        // Specify the size of the buffer used to read the file (in bytes, default is 4096)
        .buffer_size(32_784)
        // Specify the length of the file used (skips an additional call to retrieve the size)
        .length(Length::Exact(123_456))
        .build()
        .await
        .expect("valid path");
    bytestream
}

pub async fn from_path(path: impl AsRef<Path>) -> Result<ByteStream, Error>

Create a ByteStream that streams data from the filesystem

This function creates a retryable ByteStream for a given path. The returned ByteStream will provide a size hint when used as an HTTP body. If the request fails, the read will begin again by reloading the file handle.

Warning

The contents of the file MUST not change during retries. The length & checksum of the file will be cached. If the contents of the file change, the operation will almost certainly fail.

Furthermore, a partial write MAY seek in the file and resume from the previous location.

Note: If you want more control, such as specifying the size of the buffer used to read the file or the length of the file, use a FsBuilder as returned from ByteStream::read_from

Examples
use aws_smithy_http::byte_stream::ByteStream;
use std::path::Path;
 async fn make_bytestream() -> ByteStream {
    ByteStream::from_path("docs/rows.csv").await.expect("file should be readable")
}

pub async fn from_file(file: File) -> Result<ByteStream, Error>

👎Deprecated since 0.40.0: Prefer the more extensible ByteStream::read_from() API

Create a ByteStream from a file

NOTE: This will NOT result in a retryable ByteStream. For a ByteStream that can be retried in the case of upstream failures, use ByteStream::from_path

pub fn into_async_read(self) -> impl AsyncRead

Convert this ByteStream into a struct that implements AsyncRead.

Example
use tokio::io::{BufReader, AsyncBufReadExt};
use aws_smithy_http::byte_stream::ByteStream;

let mut lines =  BufReader::new(my_bytestream.into_async_read()).lines();
while let Some(line) = lines.next_line().await? {
  // Do something line by line
}

pub fn map( self, f: impl Fn(SdkBody) -> SdkBody + Send + Sync + 'static ) -> ByteStream

Given a function to modify an SdkBody, run it on the SdkBody inside this Bytestream. returning a new Bytestream.

Trait Implementations§

§

impl Debug for ByteStream

§

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

Formats the value using the given formatter. Read more
§

impl Default for ByteStream

§

fn default() -> ByteStream

Returns the “default value” for a type. Read more
§

impl From<Body> for ByteStream

§

fn from(input: Body) -> ByteStream

Converts to this type from the input type.
§

impl From<Bytes> for ByteStream

Construct a retryable ByteStream from bytes::Bytes

§

fn from(input: Bytes) -> ByteStream

Converts to this type from the input type.
§

impl From<SdkBody> for ByteStream

§

fn from(inp: SdkBody) -> ByteStream

Converts to this type from the input type.
§

impl From<Vec<u8>> for ByteStream

Construct a retryable ByteStream from a Vec<u8>.

This will convert the Vec<u8> into bytes::Bytes to enable efficient retries.

§

fn from(input: Vec<u8>) -> ByteStream

Converts to this type from the input type.
§

impl Stream for ByteStream

§

type Item = Result<Bytes, Error>

Values yielded by the stream.
§

fn poll_next( self: Pin<&mut ByteStream>, cx: &mut Context<'_> ) -> Poll<Option<<ByteStream as Stream>::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more
§

fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream. Read more
§

impl<'__pin> Unpin for ByteStream
where __Origin<'__pin>: Unpin,

Auto Trait Implementations§

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<'a, T, E> AsTaggedExplicit<'a, E> for T
where T: 'a,

§

fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

§

impl<'a, T, E> AsTaggedImplicit<'a, E> for T
where T: 'a,

§

fn implicit( self, class: Class, constructed: bool, tag: u32 ) -> TaggedParser<'a, Implicit, Self, E>

source§

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

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where 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.

§

impl<T> Instrument for T

§

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

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

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<U> for T
where 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> Same for T

§

type Output = T

Should always be Self
§

impl<St> StreamExt for St
where St: Stream + ?Sized,

§

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

Consumes and returns the next value in the stream or None if the stream is finished. Read more
§

fn try_next<T, E>(&mut self) -> TryNext<'_, Self>
where Self: Stream<Item = Result<T, E>> + Unpin,

Consumes and returns the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more
§

fn map<T, F>(self, f: F) -> Map<Self, F>
where F: FnMut(Self::Item) -> T, Self: Sized,

Maps this stream’s items to a different type, returning a new stream of the resulting type. Read more
§

fn map_while<T, F>(self, f: F) -> MapWhile<Self, F>
where F: FnMut(Self::Item) -> Option<T>, Self: Sized,

Map this stream’s items to a different type for as long as determined by the provided closure. A stream of the target type will be returned, which will yield elements until the closure returns None. Read more
§

fn then<F, Fut>(self, f: F) -> Then<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future, Self: Sized,

Maps this stream’s items asynchronously to a different type, returning a new stream of the resulting type. Read more
§

fn merge<U>(self, other: U) -> Merge<Self, U>
where U: Stream<Item = Self::Item>, Self: Sized,

Combine two streams into one by interleaving the output of both as it is produced. Read more
§

fn filter<F>(self, f: F) -> Filter<Self, F>
where F: FnMut(&Self::Item) -> bool, Self: Sized,

Filters the values produced by this stream according to the provided predicate. Read more
§

fn filter_map<T, F>(self, f: F) -> FilterMap<Self, F>
where F: FnMut(Self::Item) -> Option<T>, Self: Sized,

Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided closure. Read more
§

fn fuse(self) -> Fuse<Self>
where Self: Sized,

Creates a stream which ends after the first None. Read more
§

fn take(self, n: usize) -> Take<Self>
where Self: Sized,

Creates a new stream of at most n items of the underlying stream. Read more
§

fn take_while<F>(self, f: F) -> TakeWhile<Self, F>
where F: FnMut(&Self::Item) -> bool, Self: Sized,

Take elements from this stream while the provided predicate resolves to true. Read more
§

fn skip(self, n: usize) -> Skip<Self>
where Self: Sized,

Creates a new stream that will skip the n first items of the underlying stream. Read more
§

fn skip_while<F>(self, f: F) -> SkipWhile<Self, F>
where F: FnMut(&Self::Item) -> bool, Self: Sized,

Skip elements from the underlying stream while the provided predicate resolves to true. Read more
§

fn all<F>(&mut self, f: F) -> AllFuture<'_, Self, F>
where Self: Unpin, F: FnMut(Self::Item) -> bool,

Tests if every element of the stream matches a predicate. Read more
§

fn any<F>(&mut self, f: F) -> AnyFuture<'_, Self, F>
where Self: Unpin, F: FnMut(Self::Item) -> bool,

Tests if any element of the stream matches a predicate. Read more
§

fn chain<U>(self, other: U) -> Chain<Self, U>
where U: Stream<Item = Self::Item>, Self: Sized,

Combine two streams into one by first returning all values from the first stream then all values from the second stream. Read more
§

fn fold<B, F>(self, init: B, f: F) -> FoldFuture<Self, B, F>
where Self: Sized, F: FnMut(B, Self::Item) -> B,

A combinator that applies a function to every element in a stream producing a single, final value. Read more
§

fn collect<T>(self) -> Collect<Self, T>
where T: FromStream<Self::Item>, Self: Sized,

Drain stream pushing all emitted values into a collection. Read more
§

fn timeout(self, duration: Duration) -> Timeout<Self>
where Self: Sized,

Applies a per-item timeout to the passed stream. Read more
§

fn timeout_repeating(self, interval: Interval) -> TimeoutRepeating<Self>
where Self: Sized,

Applies a per-item timeout to the passed stream. Read more
§

fn throttle(self, duration: Duration) -> Throttle<Self>
where Self: Sized,

Slows down a stream by enforcing a delay between items. Read more
§

fn chunks_timeout( self, max_size: usize, duration: Duration ) -> ChunksTimeout<Self>
where Self: Sized,

Batches the items in the given stream using a maximum duration and size for each batch. Read more
§

impl<T> StreamExt for T
where T: Stream + ?Sized,

§

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

Creates a future that resolves to the next item in the stream. Read more
§

fn into_future(self) -> StreamFuture<Self>
where Self: Sized + Unpin,

Converts this stream into a future of (next_item, tail_of_stream). If the stream terminates, then the next item is None. Read more
§

fn map<T, F>(self, f: F) -> Map<Self, F>
where F: FnMut(Self::Item) -> T, Self: Sized,

Maps this stream’s items to a different type, returning a new stream of the resulting type. Read more
§

fn enumerate(self) -> Enumerate<Self>
where Self: Sized,

Creates a stream which gives the current iteration count as well as the next value. Read more
§

fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F>
where F: FnMut(&Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Filters the values produced by this stream according to the provided asynchronous predicate. Read more
§

fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = Option<T>>, Self: Sized,

Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
§

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future, Self: Sized,

Computes from this stream’s items new items of a different type using an asynchronous closure. Read more
§

fn collect<C>(self) -> Collect<Self, C>
where C: Default + Extend<Self::Item>, Self: Sized,

Transforms a stream into a collection, returning a future representing the result of that computation. Read more
§

fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB>
where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Sized + Stream<Item = (A, B)>,

Converts a stream of pairs into a future, which resolves to pair of containers. Read more
§

fn concat(self) -> Concat<Self>
where Self: Sized, Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default,

Concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more
§

fn count(self) -> Count<Self>
where Self: Sized,

Drives the stream to completion, counting the number of items. Read more
§

fn cycle(self) -> Cycle<Self>
where Self: Sized + Clone,

Repeats a stream endlessly. Read more
§

fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F>
where F: FnMut(T, Self::Item) -> Fut, Fut: Future<Output = T>, Self: Sized,

Execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
§

fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Execute predicate over asynchronous stream, and return true if any element in stream satisfied a predicate. Read more
§

fn all<Fut, F>(self, f: F) -> All<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Execute predicate over asynchronous stream, and return true if all element in stream satisfied a predicate. Read more
§

fn flatten(self) -> Flatten<Self>
where Self::Item: Stream, Self: Sized,

Flattens a stream of streams into just one continuous stream. Read more
§

fn flatten_unordered( self, limit: impl Into<Option<usize>> ) -> FlattenUnorderedWithFlowController<Self, ()>
where Self::Item: Stream + Unpin, Self: Sized,

Flattens a stream of streams into just one continuous stream. Polls inner streams produced by the base stream concurrently. Read more
§

fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
where F: FnMut(Self::Item) -> U, U: Stream, Self: Sized,

Maps a stream like [StreamExt::map] but flattens nested Streams. Read more
§

fn flat_map_unordered<U, F>( self, limit: impl Into<Option<usize>>, f: F ) -> FlatMapUnordered<Self, U, F>
where U: Stream + Unpin, F: FnMut(Self::Item) -> U, Self: Sized,

Maps a stream like [StreamExt::map] but flattens nested Streams and polls them concurrently, yielding items in any order, as they made available. Read more
§

fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F>
where F: FnMut(&mut S, Self::Item) -> Fut, Fut: Future<Output = Option<B>>, Self: Sized,

Combinator similar to [StreamExt::fold] that holds internal state and produces a new stream. Read more
§

fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F>
where F: FnMut(&Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
§

fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F>
where F: FnMut(&Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Take elements from this stream while the provided asynchronous predicate resolves to true. Read more
§

fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut>
where Fut: Future, Self: Sized,

Take elements from this stream until the provided future resolves. Read more
§

fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = ()>, Self: Sized,

Runs this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
§

fn for_each_concurrent<Fut, F>( self, limit: impl Into<Option<usize>>, f: F ) -> ForEachConcurrent<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = ()>, Self: Sized,

Runs this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available. Read more
§

fn take(self, n: usize) -> Take<Self>
where Self: Sized,

Creates a new stream of at most n items of the underlying stream. Read more
§

fn skip(self, n: usize) -> Skip<Self>
where Self: Sized,

Creates a new stream which skips n items of the underlying stream. Read more
§

fn fuse(self) -> Fuse<Self>
where Self: Sized,

Fuse a stream such that poll_next will never again be called once it has finished. This method can be used to turn any Stream into a FusedStream. Read more
§

fn by_ref(&mut self) -> &mut Self

Borrows a stream, rather than consuming it. Read more
§

fn catch_unwind(self) -> CatchUnwind<Self>
where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the stream. Read more
§

fn boxed<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a>>
where Self: Sized + Send + 'a,

Wrap the stream in a Box, pinning it. Read more
§

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a>>
where Self: Sized + 'a,

Wrap the stream in a Box, pinning it. Read more
§

fn buffered(self, n: usize) -> Buffered<Self>
where Self::Item: Future, Self: Sized,

An adaptor for creating a buffered list of pending futures. Read more
§

fn buffer_unordered(self, n: usize) -> BufferUnordered<Self>
where Self::Item: Future, Self: Sized,

An adaptor for creating a buffered list of pending futures (unordered). Read more
§

fn zip<St>(self, other: St) -> Zip<Self, St>
where St: Stream, Self: Sized,

An adapter for zipping two streams together. Read more
§

fn chain<St>(self, other: St) -> Chain<Self, St>
where St: Stream<Item = Self::Item>, Self: Sized,

Adapter for chaining two streams. Read more
§

fn peekable(self) -> Peekable<Self>
where Self: Sized,

Creates a new stream which exposes a peek method. Read more
§

fn chunks(self, capacity: usize) -> Chunks<Self>
where Self: Sized,

An adaptor for chunking up items of the stream inside a vector. Read more
§

fn ready_chunks(self, capacity: usize) -> ReadyChunks<Self>
where Self: Sized,

An adaptor for chunking up ready items of the stream inside a vector. Read more
§

fn forward<S>(self, sink: S) -> Forward<Self, S>
where S: Sink<Self::Ok, Error = Self::Error>, Self: TryStream + Sized,

A future that completes after the given stream has been fully processed into the sink and the sink has been flushed and closed. Read more
§

fn split<Item>(self) -> (SplitSink<Self, Item>, SplitStream<Self>)
where Self: Sink<Item> + Sized,

Splits this Stream + Sink object into separate Sink and Stream objects. Read more
§

fn inspect<F>(self, f: F) -> Inspect<Self, F>
where F: FnMut(&Self::Item), Self: Sized,

Do something with each item of this stream, afterwards passing it on. Read more
§

fn left_stream<B>(self) -> Either<Self, B>
where B: Stream<Item = Self::Item>, Self: Sized,

Wrap this stream in an Either stream, making it the left-hand variant of that Either. Read more
§

fn right_stream<B>(self) -> Either<B, Self>
where B: Stream<Item = Self::Item>, Self: Sized,

Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more
§

fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>
where Self: Unpin,

A convenience method for calling [Stream::poll_next] on Unpin stream types.
§

fn select_next_some(&mut self) -> SelectNextSome<'_, Self>
where Self: Unpin + FusedStream,

Returns a Future that resolves when the next item in this stream is ready. Read more
source§

impl<T, U> TryFrom<U> for T
where 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 T
where 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.
§

impl<S, T, E> TryStream for S
where S: Stream<Item = Result<T, E>> + ?Sized,

§

type Ok = T

The type of successful values yielded by this future
§

type Error = E

The type of failures yielded by this future
§

fn try_poll_next( self: Pin<&mut S>, cx: &mut Context<'_> ) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>

Poll this TryStream as if it were a Stream. Read more
§

impl<S> TryStreamExt for S
where S: TryStream + ?Sized,

§

fn err_into<E>(self) -> ErrInto<Self, E>
where Self: Sized, Self::Error: Into<E>,

Wraps the current stream in a new stream which converts the error type into the one provided. Read more
§

fn map_ok<T, F>(self, f: F) -> MapOk<Self, F>
where Self: Sized, F: FnMut(Self::Ok) -> T,

Wraps the current stream in a new stream which maps the success value using the provided closure. Read more
§

fn map_err<E, F>(self, f: F) -> MapErr<Self, F>
where Self: Sized, F: FnMut(Self::Error) -> E,

Wraps the current stream in a new stream which maps the error value using the provided closure. Read more
§

fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F>
where F: FnMut(Self::Ok) -> Fut, Fut: TryFuture<Error = Self::Error>, Self: Sized,

Chain on a computation for when a value is ready, passing the successful results to the provided closure f. Read more
§

fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F>
where F: FnMut(Self::Error) -> Fut, Fut: TryFuture<Ok = Self::Ok>, Self: Sized,

Chain on a computation for when an error happens, passing the erroneous result to the provided closure f. Read more
§

fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F>
where F: FnMut(&Self::Ok), Self: Sized,

Do something with the success value of this stream, afterwards passing it on. Read more
§

fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>
where F: FnMut(&Self::Error), Self: Sized,

Do something with the error value of this stream, afterwards passing it on. Read more
§

fn into_stream(self) -> IntoStream<Self>
where Self: Sized,

Wraps a [TryStream] into a type that implements Stream Read more
§

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

Creates a future that attempts to resolve the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more
§

fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F>
where F: FnMut(Self::Ok) -> Fut, Fut: TryFuture<Ok = (), Error = Self::Error>, Self: Sized,

Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
§

fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F>
where F: FnMut(&Self::Ok) -> Fut, Fut: TryFuture<Ok = bool, Error = Self::Error>, Self: Sized,

Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
§

fn try_take_while<Fut, F>(self, f: F) -> TryTakeWhile<Self, Fut, F>
where F: FnMut(&Self::Ok) -> Fut, Fut: TryFuture<Ok = bool, Error = Self::Error>, Self: Sized,

Take elements on this stream while the provided asynchronous predicate resolves to true. Read more
§

fn try_for_each_concurrent<Fut, F>( self, limit: impl Into<Option<usize>>, f: F ) -> TryForEachConcurrent<Self, Fut, F>
where F: FnMut(Self::Ok) -> Fut, Fut: Future<Output = Result<(), Self::Error>>, Self: Sized,

Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available, exiting as soon as an error occurs. Read more
§

fn try_collect<C>(self) -> TryCollect<Self, C>
where C: Default + Extend<Self::Ok>, Self: Sized,

Attempt to transform a stream into a collection, returning a future representing the result of that computation. Read more
§

fn try_chunks(self, capacity: usize) -> TryChunks<Self>
where Self: Sized,

An adaptor for chunking up successful items of the stream inside a vector. Read more
§

fn try_ready_chunks(self, capacity: usize) -> TryReadyChunks<Self>
where Self: Sized,

An adaptor for chunking up successful, ready items of the stream inside a vector. Read more
§

fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F>
where Fut: Future<Output = bool>, F: FnMut(&Self::Ok) -> Fut, Self: Sized,

Attempt to filter the values produced by this stream according to the provided asynchronous closure. Read more
§

fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F>
where Fut: TryFuture<Ok = Option<T>, Error = Self::Error>, F: FnMut(Self::Ok) -> Fut, Self: Sized,

Attempt to filter the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
§

fn try_flatten_unordered( self, limit: impl Into<Option<usize>> ) -> TryFlattenUnordered<Self>
where Self::Ok: TryStream + Unpin, <Self::Ok as TryStream>::Error: From<Self::Error>, Self: Sized,

Flattens a stream of streams into just one continuous stream. Produced streams will be polled concurrently and any errors will be passed through without looking at them. If the underlying base stream returns an error, it will be immediately propagated. Read more
§

fn try_flatten(self) -> TryFlatten<Self>
where Self::Ok: TryStream, <Self::Ok as TryStream>::Error: From<Self::Error>, Self: Sized,

Flattens a stream of streams into just one continuous stream. Read more
§

fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F>
where F: FnMut(T, Self::Ok) -> Fut, Fut: TryFuture<Ok = T, Error = Self::Error>, Self: Sized,

Attempt to execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
§

fn try_concat(self) -> TryConcat<Self>
where Self: Sized, Self::Ok: Extend<<Self::Ok as IntoIterator>::Item> + IntoIterator + Default,

Attempt to concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more
§

fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self>
where Self::Ok: TryFuture<Error = Self::Error>, Self: Sized,

Attempt to execute several futures from a stream concurrently (unordered). Read more
§

fn try_buffered(self, n: usize) -> TryBuffered<Self>
where Self::Ok: TryFuture<Error = Self::Error>, Self: Sized,

Attempt to execute several futures from a stream concurrently. Read more
§

fn try_poll_next_unpin( &mut self, cx: &mut Context<'_> ) -> Poll<Option<Result<Self::Ok, Self::Error>>>
where Self: Unpin,

A convenience method for calling [TryStream::try_poll_next] on Unpin stream types.
§

fn into_async_read(self) -> IntoAsyncRead<Self>
where Self: Sized + TryStreamExt<Error = Error>, Self::Ok: AsRef<[u8]>,

Adapter that converts this stream into an AsyncBufRead. Read more
§

fn try_all<Fut, F>(self, f: F) -> TryAll<Self, Fut, F>
where Self: Sized, F: FnMut(Self::Ok) -> Fut, Fut: Future<Output = bool>,

Attempt to execute a predicate over an asynchronous stream and evaluate if all items satisfy the predicate. Exits early if an Err is encountered or if an Ok item is found that does not satisfy the predicate. Read more
§

fn try_any<Fut, F>(self, f: F) -> TryAny<Self, Fut, F>
where Self: Sized, F: FnMut(Self::Ok) -> Fut, Fut: Future<Output = bool>,

Attempt to execute a predicate over an asynchronous stream and evaluate if any items satisfy the predicate. Exits early if an Err is encountered or if an Ok item is found that satisfies the predicate. Read more
§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

§

fn vzip(self) -> V

§

impl<T> WithSubscriber for T

§

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
§

fn with_current_subscriber(self) -> WithDispatch<Self>

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