Struct google_cloud_gax::grpc::Streaming

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pub struct Streaming<T> { /* private fields */ }

Expand description

Streaming requests and responses.

This will wrap some inner Body and Decoder and provide an interface to fetch the message stream and trailing metadata

Implementations

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impl<T> Streaming<T>

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pub async fn message(
&mut self
) -> impl Future<Output = Result<Option<T>, Status>>

Fetch the next message from this stream.

Return value

Result::Err(val) means a gRPC error was sent by the sender instead of a valid response message. Refer to Status::code and Status::message to examine possible error causes.
Result::Ok(None) means the stream was closed by the sender and no more messages will be delivered. Further attempts to call Streaming::message will result in the same return value.
Result::Ok(Some(val)) means the sender streamed a valid response message val.

if let Some(next_message) = request.message().await? {
    println!("{:?}", next_message);
}

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pub async fn trailers(
&mut self
) -> impl Future<Output = Result<Option<MetadataMap>, Status>>

Fetch the trailing metadata.

This will drain the stream of all its messages to receive the trailing metadata. If Streaming::message returns None then this function will not need to poll for trailers since the body was totally consumed.

if let Some(metadata) = request.trailers().await? {
    println!("{:?}", metadata);
}

Trait Implementations

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impl<T> Debug for Streaming<T>

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

Formats the value using the given formatter. Read more

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impl<T> Stream for Streaming<T>

type Item = Result<T, Status>

Values yielded by the stream.

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fn poll_next(
self: Pin<&mut Streaming<T>>,
cx: &mut Context<'_>
) -> Poll<Option<<Streaming<T> 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

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impl<T> Unpin for Streaming<T>

Auto Trait Implementations

impl<T> !RefUnwindSafe for Streaming<T>

impl<T> Send for Streaming<T>

impl<T> !Sync for Streaming<T>

impl<T> !UnwindSafe for Streaming<T>

Blanket Implementations

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<K, S, E, D> Discover for Dwhere
D: TryStream<Ok = Change<K, S>, Error = E> + ?Sized,
K: Eq,

type Key = K

A unique identifier for each active service. Read more

type Service = S

The type of Service yielded by this Discover. Read more

type Error = E

Error produced during discovery

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

Yields the next discovery change set.

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>`impl<T> Future for Instrumented<T>where T: Future, type Output = <T as Future>::Output;`

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

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fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>`impl<T> Future for Instrumented<T>where T: Future, type Output = <T as Future>::Output;`

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

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impl<T, U> Into for Twhere
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.

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impl<T> IntoRequest<T> for T

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fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request

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impl<T> IntoStreamingRequest for Twhere
T: 'static + Stream + Send,

type Stream = T

The RPC request stream type

type Message = <T as Stream>::Item

The RPC request type

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fn into_streaming_request(self) -> Request<T>

Wrap the stream of messages in a tonic::Request

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

fn next(&mut self) -> Next<'_, Self>ⓘNotable traits for Next<'_, St>`impl<St> Future for Next<'_, St>where St: Stream + Unpin + ?Sized, type Output = Option<<St as Stream>::Item>;`where
Self: Unpin,

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

fn into_future(self) -> StreamFuture<Self>ⓘNotable traits for StreamFuture<St>`impl<St> Future for StreamFuture<St>where St: Stream + Unpin, type Output = (Option<<St as Stream>::Item>, St);`where
Self: 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,

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

fn enumerate(self) -> Enumerate<Self>

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>,

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>>,

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,

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>ⓘNotable traits for Collect<St, C>`impl<St, C> Future for Collect<St, C>where St: Stream, C: Default + Extend<<St as Stream>::Item>, type Output = C;`where
C: Default + Extend<Self::Item>,

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>ⓘNotable traits for Unzip<St, FromA, FromB>`impl<St, A, B, FromA, FromB> Future for Unzip<St, FromA, FromB>where St: Stream<Item = (A, B)>, FromA: Default + Extend<A>, FromB: Default + Extend, type Output = (FromA, FromB);`where
 FromA: Default + Extend<A>,
 FromB: Default + Extend,
 Self: 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>ⓘNotable traits for Concat<St>`impl<St> Future for Concat<St>where St: Stream, <St as Stream>::Item: Extend<<<St as Stream>::Item as IntoIterator>::Item> + IntoIterator + Default, type Output = <St as Stream>::Item;`where
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>

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

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

Repeats a stream endlessly. Read more

fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F>ⓘNotable traits for Fold<St, Fut, T, F>`impl<St, Fut, T, F> Future for Fold<St, Fut, T, F>where St: Stream, F: FnMut(T, <St as Stream>::Item) -> Fut, Fut: Future<Output = T>, type Output = T;`where
 F: FnMut(T, Self::Item) -> Fut,
 Fut: Future<Output = T>,

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>,

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>,

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,

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

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

Flattens a stream of streams into just one continuous stream. Polls inner streams concurrently. Read more

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

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,

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>,

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>,

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>,

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,

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

fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F>ⓘNotable traits for ForEach<St, Fut, F>`impl<St, Fut, F> Future for ForEach<St, Fut, F>where St: Stream, F: FnMut(<St as Stream>::Item) -> Fut, Fut: Future<Output = ()>, type Output = ();`where
 F: FnMut(Self::Item) -> Fut,
 Fut: Future<Output = ()>,

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>ⓘNotable traits for ForEachConcurrent<St, Fut, F>`impl<St, Fut, F> Future for ForEachConcurrent<St, Fut, F>where St: Stream, F: FnMut(<St as Stream>::Item) -> Fut, Fut: Future<Output = ()>, type Output = ();`where
 F: FnMut(Self::Item) -> Fut,
 Fut: Future<Output = ()>,

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>

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

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

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

fn fuse(self) -> Fuse<Self>

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 boxed<'a>(
 self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>ⓘNotable traits for Pin`impl Future for Pinwhere P: DerefMut, ::Target: Future, type Output = <::Target as Future>::Output;`where
 Self: 'a + Send,

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

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>ⓘNotable traits for Pin`impl Future for Pinwhere P: DerefMut, ::Target: Future, type Output = <::Target as Future>::Output;`where
Self: 'a,

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

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

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

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

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,

An adapter for zipping two streams together. Read more

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

Adapter for chaining two streams. Read more

fn peekable(self) -> Peekable<Self>

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

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

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

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

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

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

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

fn left_stream(self) -> Either<Self, B>ⓘNotable traits for Either<A, B>`impl<A, B> Future for Either<A, B>where A: Future, B: Future<Output = <A as Future>::Output>, type Output = <A as Future>::Output;`where
B: Stream<Item = Self::Item>,

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

fn right_stream(self) -> Either<B, Self>ⓘNotable traits for Either<A, B>`impl<A, B> Future for Either<A, B>where A: Future, B: Future<Output = <A as Future>::Output>, type Output = <A as Future>::Output;`where
B: Stream<Item = Self::Item>,

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. Read more

fn select_next_some(&mut self) -> SelectNextSome<'_, Self>ⓘNotable traits for SelectNextSome<'_, St>`impl<St> Future for SelectNextSome<'_, St>where St: FusedStream + Unpin + ?Sized, type Output = <St as Stream>::Item;`where
Self: Unpin + FusedStream,

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

impl<St> StreamExt for Stwhere
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,

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>,

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,

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

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

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,

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>,

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>

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

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

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,

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

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

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,

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

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
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>,

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

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

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

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

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

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

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

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impl<T, U> TryFrom for Twhere
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.

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impl<T, U> TryInto for Twhere
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.

impl<S, T, E> TryStream for Swhere
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 Swhere
S: TryStream + ?Sized,

fn err_into<E>(self) -> ErrInto<Self, E>where
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
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
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>,

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>,

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),

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),

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

fn into_stream(self) -> IntoStream<Self>

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

fn try_next(&mut self) -> TryNext<'_, Self>ⓘNotable traits for TryNext<'_, St>`impl<St> Future for TryNext<'_, St>where St: TryStream + Unpin + ?Sized, type Output = Result<Option<<St as TryStream>::Ok>, <St as TryStream>::Error>;`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>ⓘNotable traits for TryForEach<St, Fut, F>`impl<St, Fut, F> Future for TryForEach<St, Fut, F>where St: TryStream, F: FnMut(<St as TryStream>::Ok) -> Fut, Fut: TryFuture<Ok = (), Error = <St as TryStream>::Error>, type Output = Result<(), <St as TryStream>::Error>;`where
 F: FnMut(Self::Ok) -> Fut,
 Fut: TryFuture<Ok = (), Error = Self::Error>,

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>,

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>,

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>ⓘNotable traits for TryForEachConcurrent<St, Fut, F>`impl<St, Fut, F> Future for TryForEachConcurrent<St, Fut, F>where St: TryStream, F: FnMut(<St as TryStream>::Ok) -> Fut, Fut: Future<Output = Result<(), <St as TryStream>::Error>>, type Output = Result<(), <St as TryStream>::Error>;`where
 F: FnMut(Self::Ok) -> Fut,
 Fut: Future<Output = Result<(), Self::Error>>,

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>ⓘNotable traits for TryCollect<St, C>`impl<St, C> Future for TryCollect<St, C>where St: TryStream, C: Default + Extend<<St as TryStream>::Ok>, type Output = Result<C, <St as TryStream>::Error>;`where
C: Default + Extend<Self::Ok>,

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>

An adaptor for chunking up successful 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,

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,

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

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>ⓘNotable traits for TryFold<St, Fut, T, F>`impl<St, Fut, T, F> Future for TryFold<St, Fut, T, F>where St: TryStream, F: FnMut(T, <St as TryStream>::Ok) -> Fut, Fut: TryFuture<Ok = T, Error = <St as TryStream>::Error>, type Output = Result<T, <St as TryStream>::Error>;`where
 F: FnMut(T, Self::Ok) -> Fut,
 Fut: TryFuture<Ok = T, Error = Self::Error>,

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>ⓘNotable traits for TryConcat<St>`impl<St> Future for TryConcat<St>where St: TryStream, <St as TryStream>::Ok: Extend<<<St as TryStream>::Ok as IntoIterator>::Item> + IntoIterator + Default, type Output = Result<<St as TryStream>::Ok, <St as TryStream>::Error>;`where
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>,

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>,

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. Read more

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

fn vzip(self) -> V

source

impl<T> WithSubscriber for T

source

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>`impl<T> Future for WithDispatch<T>where T: Future, type Output = <T as Future>::Output;`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>ⓘNotable traits for WithDispatch<T>`impl<T> Future for WithDispatch<T>where T: Future, type Output = <T as Future>::Output;`

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

Struct google_cloud_gax::grpc::Streaming

Implementations

impl<T> Streaming<T>

pub async fn message( &mut self) -> impl Future<Output = Result<Option<T>, Status>>

Return value

pub async fn trailers( &mut self) -> impl Future<Output = Result<Option<MetadataMap>, Status>>

Trait Implementations

impl<T> Debug for Streaming<T>

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

impl<T> Stream for Streaming<T>

type Item = Result<T, Status>

fn poll_next( self: Pin<&mut Streaming<T>>, cx: &mut Context<'_>) -> Poll<Option<<Streaming<T> as Stream>::Item>>

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

impl<T> Unpin for Streaming<T>

Auto Trait Implementations

impl<T> !RefUnwindSafe for Streaming<T>

impl<T> Send for Streaming<T>

impl<T> !Sync for Streaming<T>

impl<T> !UnwindSafe for Streaming<T>

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<K, S, E, D> Discover for Dwhere D: TryStream<Ok = Change<K, S>, Error = E> + ?Sized, K: Eq,

type Key = K

type Service = S

type Error = E

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

impl<T> From<T> for T

fn from(t: T) -> T

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T>where T: Future, type Output = <T as Future>::Output;

fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T>where T: Future, type Output = <T as Future>::Output;

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

fn into(self) -> U

impl<T> IntoRequest<T> for T

fn into_request(self) -> Request<T>

impl<T> IntoStreamingRequest for Twhere T: 'static + Stream + Send,

type Stream = T

type Message = <T as Stream>::Item

fn into_streaming_request(self) -> Request<T>

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

fn next(&mut self) -> Next<'_, Self>ⓘNotable traits for Next<'_, St>impl<St> Future for Next<'_, St>where St: Stream + Unpin + ?Sized, type Output = Option<<St as Stream>::Item>;where Self: Unpin,

fn into_future(self) -> StreamFuture<Self>ⓘNotable traits for StreamFuture<St>impl<St> Future for StreamFuture<St>where St: Stream + Unpin, type Output = (Option<<St as Stream>::Item>, St);where Self: Unpin,

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

fn enumerate(self) -> Enumerate<Self>

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

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

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

fn collect<C>(self) -> Collect<Self, C>ⓘNotable traits for Collect<St, C>impl<St, C> Future for Collect<St, C>where St: Stream, C: Default + Extend<<St as Stream>::Item>, type Output = C;where C: Default + Extend<Self::Item>,

fn count(self) -> Count<Self>

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

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

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

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

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

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

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,

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>>,

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

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

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

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

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

fn fuse(self) -> Fuse<Self>

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

fn boxed<'a>( self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>ⓘNotable traits for Pin<P>impl<P> Future for Pin<P>where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;where Self: 'a + Send,

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>ⓘNotable traits for Pin<P>impl<P> Future for Pin<P>where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;where Self: 'a,

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

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

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

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

fn peekable(self) -> Peekable<Self>

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

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

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

fn left_stream<B>(self) -> Either<Self, B>ⓘNotable traits for Either<A, B>impl<A, B> Future for Either<A, B>where A: Future, B: Future<Output = <A as Future>::Output>, type Output = <A as Future>::Output;where B: Stream<Item = Self::Item>,

pub async fn message(
&mut self
) -> impl Future<Output = Result<Option<T>, Status>>

pub async fn trailers(
&mut self
) -> impl Future<Output = Result<Option<MetadataMap>, Status>>

fn poll_next(
self: Pin<&mut Streaming<T>>,
cx: &mut Context<'_>
) -> Poll<Option<<Streaming<T> as Stream>::Item>>

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

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

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

impl<K, S, E, D> Discover for Dwhere
D: TryStream<Ok = Change<K, S>, Error = E> + ?Sized,
K: Eq,

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

fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>`impl<T> Future for Instrumented<T>where T: Future, type Output = <T as Future>::Output;`

fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>`impl<T> Future for Instrumented<T>where T: Future, type Output = <T as Future>::Output;`

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

impl<T> IntoStreamingRequest for Twhere
T: 'static + Stream + Send,

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

fn next(&mut self) -> Next<'_, Self>ⓘNotable traits for Next<'_, St>`impl<St> Future for Next<'_, St>where St: Stream + Unpin + ?Sized, type Output = Option<<St as Stream>::Item>;`where
Self: Unpin,

fn into_future(self) -> StreamFuture<Self>ⓘNotable traits for StreamFuture<St>`impl<St> Future for StreamFuture<St>where St: Stream + Unpin, type Output = (Option<<St as Stream>::Item>, St);`where
Self: Unpin,

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

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

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

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

fn collect<C>(self) -> Collect<Self, C>ⓘNotable traits for Collect<St, C>`impl<St, C> Future for Collect<St, C>where St: Stream, C: Default + Extend<<St as Stream>::Item>, type Output = C;`where
C: Default + Extend<Self::Item>,

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

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

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

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

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

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

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,

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>>,

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

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

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

fn boxed<'a>(
self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>ⓘNotable traits for Pin<P>`impl<P> Future for Pin<P>where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;`where
Self: 'a + Send,

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>ⓘNotable traits for Pin<P>`impl<P> Future for Pin<P>where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;`where
Self: 'a,

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

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

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

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

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

fn left_stream<B>(self) -> Either<Self, B>ⓘNotable traits for Either<A, B>`impl<A, B> Future for Either<A, B>where A: Future, B: Future<Output = <A as Future>::Output>, type Output = <A as Future>::Output;`where
B: Stream<Item = Self::Item>,

fn right_stream<B>(self) -> Either<B, Self>ⓘNotable traits for Either<A, B>`impl<A, B> Future for Either<A, B>where A: Future, B: Future<Output = <A as Future>::Output>, type Output = <A as Future>::Output;`where
B: Stream<Item = Self::Item>,

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

fn select_next_some(&mut self) -> SelectNextSome<'_, Self>ⓘNotable traits for SelectNextSome<'_, St>`impl<St> Future for SelectNextSome<'_, St>where St: FusedStream + Unpin + ?Sized, type Output = <St as Stream>::Item;`where
Self: Unpin + FusedStream,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

fn try_next(&mut self) -> TryNext<'_, Self>ⓘNotable traits for TryNext<'_, St>`impl<St> Future for TryNext<'_, St>where St: TryStream + Unpin + ?Sized, type Output = Result<Option<<St as TryStream>::Ok>, <St as TryStream>::Error>;`where
Self: Unpin,

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>,

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>,

fn try_collect<C>(self) -> TryCollect<Self, C>ⓘNotable traits for TryCollect<St, C>`impl<St, C> Future for TryCollect<St, C>where St: TryStream, C: Default + Extend<<St as TryStream>::Ok>, type Output = Result<C, <St as TryStream>::Error>;`where
C: Default + Extend<Self::Ok>,

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

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,

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

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

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