pub struct CallAll<Svc, S>{ /* private fields */ }
Expand description
This is a Stream
of responses resulting from calling the wrapped Service
for each
request received on the wrapped Stream
.
use futures::future::{ready, Ready};
use futures::StreamExt;
use futures::channel::mpsc;
use tower_service::Service;
use tower::util::ServiceExt;
// First, we need to have a Service to process our requests.
#[derive(Debug, Eq, PartialEq)]
struct FirstLetter;
impl Service<&'static str> for FirstLetter {
type Response = &'static str;
type Error = Box<dyn Error + Send + Sync>;
type Future = Ready<Result<Self::Response, Self::Error>>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, req: &'static str) -> Self::Future {
ready(Ok(&req[..1]))
}
}
#[tokio::main]
async fn main() {
// Next, we need a Stream of requests.
let (mut reqs, rx) = mpsc::unbounded();
// Note that we have to help Rust out here by telling it what error type to use.
// Specifically, it has to be From<Service::Error> + From<Stream::Error>.
let mut rsps = FirstLetter.call_all(rx);
// Now, let's send a few requests and then check that we get the corresponding responses.
reqs.unbounded_send("one").unwrap();
reqs.unbounded_send("two").unwrap();
reqs.unbounded_send("three").unwrap();
drop(reqs);
// We then loop over the response Strem that we get back from call_all.
let mut i = 0usize;
while let Some(rsp) = rsps.next().await {
// Each response is a Result (we could also have used TryStream::try_next)
match (i + 1, rsp.unwrap()) {
(1, "o") |
(2, "t") |
(3, "t") => {}
(n, i) => {
unreachable!("{}. response was '{}'", n, i);
}
}
i += 1;
}
// And at the end, we can get the Service back when there are no more requests.
assert_eq!(rsps.into_inner(), FirstLetter);
}
Implementations§
source§impl<Svc, S> CallAll<Svc, S>
impl<Svc, S> CallAll<Svc, S>
sourcepub fn into_inner(self) -> Svc
pub fn into_inner(self) -> Svc
sourcepub fn take_service(self: Pin<&mut Self>) -> Svc
pub fn take_service(self: Pin<&mut Self>) -> Svc
Extract the wrapped Service
.
This CallAll
can no longer be used after this function has been called.
§Panics
Panics if take_service
was already called.
sourcepub fn unordered(self) -> CallAllUnordered<Svc, S>
pub fn unordered(self) -> CallAllUnordered<Svc, S>
Trait Implementations§
source§impl<Svc, S> Stream for CallAll<Svc, S>
impl<Svc, S> Stream for CallAll<Svc, S>
source§type Item = Result<<Svc as Service<<S as Stream>::Item>>::Response, Box<dyn Error + Send + Sync>>
type Item = Result<<Svc as Service<<S as Stream>::Item>>::Response, Box<dyn Error + Send + Sync>>
Values yielded by the stream.
impl<'__pin, Svc, S> Unpin for CallAll<Svc, S>
Auto Trait Implementations§
impl<Svc, S> !Freeze for CallAll<Svc, S>
impl<Svc, S> !RefUnwindSafe for CallAll<Svc, S>
impl<Svc, S> Send for CallAll<Svc, S>
impl<Svc, S> Sync for CallAll<Svc, S>
impl<Svc, S> !UnwindSafe for CallAll<Svc, S>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> StreamExt for T
impl<T> StreamExt for T
source§fn next(&mut self) -> Next<'_, Self>where
Self: Unpin,
fn next(&mut self) -> Next<'_, Self>where
Self: Unpin,
Creates a future that resolves to the next item in the stream. Read more
source§fn into_future(self) -> StreamFuture<Self>
fn into_future(self) -> StreamFuture<Self>
source§fn map<T, F>(self, f: F) -> Map<Self, F>
fn map<T, F>(self, f: F) -> Map<Self, F>
Maps this stream’s items to a different type, returning a new stream of
the resulting type. Read more
source§fn enumerate(self) -> Enumerate<Self>where
Self: Sized,
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
source§fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F>
fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F>
Filters the values produced by this stream according to the provided
asynchronous predicate. Read more
source§fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F>
fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F>
Filters the values produced by this stream while simultaneously mapping
them to a different type according to the provided asynchronous closure. Read more
source§fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>
fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>
Computes from this stream’s items new items of a different type using
an asynchronous closure. Read more
source§fn collect<C>(self) -> Collect<Self, C>
fn collect<C>(self) -> Collect<Self, C>
Transforms a stream into a collection, returning a
future representing the result of that computation. Read more
source§fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB>
fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB>
Converts a stream of pairs into a future, which
resolves to pair of containers. Read more
source§fn concat(self) -> Concat<Self>
fn concat(self) -> Concat<Self>
Concatenate all items of a stream into a single extendable
destination, returning a future representing the end result. Read more
source§fn count(self) -> Count<Self>where
Self: Sized,
fn count(self) -> Count<Self>where
Self: Sized,
Drives the stream to completion, counting the number of items. Read more
source§fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F>
fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F>
Execute an accumulating asynchronous computation over a stream,
collecting all the values into one final result. Read more
source§fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F>
fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F>
Execute predicate over asynchronous stream, and return
true
if any element in stream satisfied a predicate. Read moresource§fn all<Fut, F>(self, f: F) -> All<Self, Fut, F>
fn all<Fut, F>(self, f: F) -> All<Self, Fut, F>
Execute predicate over asynchronous stream, and return
true
if all element in stream satisfied a predicate. Read moresource§fn flatten(self) -> Flatten<Self>
fn flatten(self) -> Flatten<Self>
Flattens a stream of streams into just one continuous stream. Read more
source§fn flatten_unordered(
self,
limit: impl Into<Option<usize>>,
) -> FlattenUnorderedWithFlowController<Self, ()>
fn flatten_unordered( self, limit: impl Into<Option<usize>>, ) -> FlattenUnorderedWithFlowController<Self, ()>
Flattens a stream of streams into just one continuous stream. Polls
inner streams produced by the base stream concurrently. Read more
source§fn flat_map_unordered<U, F>(
self,
limit: impl Into<Option<usize>>,
f: F,
) -> FlatMapUnordered<Self, U, F>
fn flat_map_unordered<U, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> FlatMapUnordered<Self, U, F>
Maps a stream like
StreamExt::map
but flattens nested Stream
s
and polls them concurrently, yielding items in any order, as they made
available. Read moresource§fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F>
fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F>
Combinator similar to
StreamExt::fold
that holds internal state
and produces a new stream. Read moresource§fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F>
fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F>
Skip elements on this stream while the provided asynchronous predicate
resolves to
true
. Read moresource§fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F>
fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F>
Take elements from this stream while the provided asynchronous predicate
resolves to
true
. Read moresource§fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut>
fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut>
Take elements from this stream until the provided future resolves. Read more
source§fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F>
fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F>
Runs this stream to completion, executing the provided asynchronous
closure for each element on the stream. Read more
source§fn for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F,
) -> ForEachConcurrent<Self, Fut, F>
fn for_each_concurrent<Fut, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> ForEachConcurrent<Self, Fut, F>
Runs this stream to completion, executing the provided asynchronous
closure for each element on the stream concurrently as elements become
available. Read more
source§fn take(self, n: usize) -> Take<Self>where
Self: Sized,
fn take(self, n: usize) -> Take<Self>where
Self: Sized,
Creates a new stream of at most
n
items of the underlying stream. Read moresource§fn skip(self, n: usize) -> Skip<Self>where
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fn skip(self, n: usize) -> Skip<Self>where
Self: Sized,
Creates a new stream which skips
n
items of the underlying stream. Read moresource§fn catch_unwind(self) -> CatchUnwind<Self>where
Self: Sized + UnwindSafe,
fn catch_unwind(self) -> CatchUnwind<Self>where
Self: Sized + UnwindSafe,
Catches unwinding panics while polling the stream. Read more
source§fn boxed<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a>>
fn boxed<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a>>
Wrap the stream in a Box, pinning it. Read more
source§fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a>>where
Self: Sized + 'a,
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
source§fn buffered(self, n: usize) -> Buffered<Self>
fn buffered(self, n: usize) -> Buffered<Self>
An adaptor for creating a buffered list of pending futures. Read more
source§fn buffer_unordered(self, n: usize) -> BufferUnordered<Self>
fn buffer_unordered(self, n: usize) -> BufferUnordered<Self>
An adaptor for creating a buffered list of pending futures (unordered). Read more
source§fn zip<St>(self, other: St) -> Zip<Self, St>
fn zip<St>(self, other: St) -> Zip<Self, St>
An adapter for zipping two streams together. Read more
source§fn peekable(self) -> Peekable<Self>where
Self: Sized,
fn peekable(self) -> Peekable<Self>where
Self: Sized,
Creates a new stream which exposes a
peek
method. Read moresource§fn chunks(self, capacity: usize) -> Chunks<Self>where
Self: Sized,
fn chunks(self, capacity: usize) -> Chunks<Self>where
Self: Sized,
An adaptor for chunking up items of the stream inside a vector. Read more
source§fn ready_chunks(self, capacity: usize) -> ReadyChunks<Self>where
Self: Sized,
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
source§fn inspect<F>(self, f: F) -> Inspect<Self, F>
fn inspect<F>(self, f: F) -> Inspect<Self, F>
Do something with each item of this stream, afterwards passing it on. Read more
source§fn left_stream<B>(self) -> Either<Self, B>
fn left_stream<B>(self) -> Either<Self, B>
source§fn right_stream<B>(self) -> Either<B, Self>
fn right_stream<B>(self) -> Either<B, Self>
source§fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>where
Self: Unpin,
fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>where
Self: Unpin,
A convenience method for calling
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on Unpin
stream types.source§fn select_next_some(&mut self) -> SelectNextSome<'_, Self>where
Self: Unpin + FusedStream,
fn select_next_some(&mut self) -> SelectNextSome<'_, Self>where
Self: Unpin + FusedStream,
source§impl<S> TryStreamExt for S
impl<S> TryStreamExt for S
source§fn err_into<E>(self) -> ErrInto<Self, E>
fn err_into<E>(self) -> ErrInto<Self, E>
Wraps the current stream in a new stream which converts the error type
into the one provided. Read more
source§fn map_ok<T, F>(self, f: F) -> MapOk<Self, F>
fn map_ok<T, F>(self, f: F) -> MapOk<Self, F>
Wraps the current stream in a new stream which maps the success value
using the provided closure. Read more
source§fn map_err<E, F>(self, f: F) -> MapErr<Self, F>
fn map_err<E, F>(self, f: F) -> MapErr<Self, F>
Wraps the current stream in a new stream which maps the error value
using the provided closure. Read more
source§fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F>
fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F>
Chain on a computation for when a value is ready, passing the successful
results to the provided closure
f
. Read moresource§fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F>
fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F>
Chain on a computation for when an error happens, passing the
erroneous result to the provided closure
f
. Read moresource§fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F>
fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F>
Do something with the success value of this stream, afterwards passing
it on. Read more
source§fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>
fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>
Do something with the error value of this stream, afterwards passing it on. Read more
source§fn into_stream(self) -> IntoStream<Self>where
Self: Sized,
fn into_stream(self) -> IntoStream<Self>where
Self: Sized,
source§fn try_next(&mut self) -> TryNext<'_, Self>where
Self: Unpin,
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
source§fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F>
fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F>
Attempts to run this stream to completion, executing the provided
asynchronous closure for each element on the stream. Read more
source§fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F>
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Skip elements on this stream while the provided asynchronous predicate
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true
. Read moresource§fn try_take_while<Fut, F>(self, f: F) -> TryTakeWhile<Self, Fut, F>
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Take elements on this stream while the provided asynchronous predicate
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true
. Read moresource§fn try_for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F,
) -> TryForEachConcurrent<Self, Fut, F>
fn try_for_each_concurrent<Fut, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> TryForEachConcurrent<Self, Fut, F>
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
source§fn try_collect<C>(self) -> TryCollect<Self, C>
fn try_collect<C>(self) -> TryCollect<Self, C>
Attempt to transform a stream into a collection,
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source§fn try_chunks(self, capacity: usize) -> TryChunks<Self>where
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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
source§fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F>
fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F>
Attempt to filter the values produced by this stream according to the
provided asynchronous closure. Read more
source§fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F>
fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F>
Attempt to filter the values produced by this stream while
simultaneously mapping them to a different type according to the
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source§fn try_flatten_unordered(
self,
limit: impl Into<Option<usize>>,
) -> TryFlattenUnordered<Self>
fn try_flatten_unordered( self, limit: impl Into<Option<usize>>, ) -> TryFlattenUnordered<Self>
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
source§fn try_flatten(self) -> TryFlatten<Self>
fn try_flatten(self) -> TryFlatten<Self>
Flattens a stream of streams into just one continuous stream. Read more
source§fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F>
fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F>
Attempt to execute an accumulating asynchronous computation over a
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source§fn try_concat(self) -> TryConcat<Self>
fn try_concat(self) -> TryConcat<Self>
Attempt to concatenate all items of a stream into a single
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source§fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self>
fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self>
Attempt to execute several futures from a stream concurrently (unordered). Read more
source§fn try_buffered(self, n: usize) -> TryBuffered<Self>
fn try_buffered(self, n: usize) -> TryBuffered<Self>
Attempt to execute several futures from a stream concurrently. Read more