Struct Instrumented

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

A future, stream, sink, or executor that has been instrumented with a tracing span.

Implementations

impl Instrumented<Runtime>

pub fn spawn<F>(&mut self, future: F) -> &mut Self

where F: Future<Item = (), Error = ()> + Send + 'static,

Spawn an instrumented future onto the Tokio runtime.

This spawns the given future onto the runtime’s executor, usually a thread pool. The thread pool is then responsible for polling the future until it completes.

This method simply wraps a call to tokio::runtime::Runtime::spawn, instrumenting the spawned future beforehand.

pub fn block_on<F, R, E>(&mut self, future: F) -> Result<R, E>

where F: Send + 'static + Future<Item = R, Error = E>, R: Send + 'static, E: Send + 'static,

Run an instrumented future to completion on the Tokio runtime.

This runs the given future on the runtime, blocking until it is complete, and yielding its resolved result. Any tasks or timers which the future spawns internally will be executed on the runtime.

This method should not be called from an asynchronous context.

This method simply wraps a call to tokio::runtime::Runtime::block_on, instrumenting the spawned future beforehand.

Panics

This function panics if the executor is at capacity, if the provided future panics, or if called within an asynchronous execution context.

pub fn executor(&self) -> Instrumented<TaskExecutor>

Return an instrumented handle to the runtime’s executor.

The returned handle can be used to spawn tasks that run on this runtime.

The instrumented handle functions identically to a tokio::runtime::TaskExecutor, but instruments the spawned futures prior to spawning them.

impl Instrumented<Runtime>

pub fn spawn<F>(&mut self, future: F) -> &mut Self

where F: Future<Item = (), Error = ()> + 'static,

Spawn an instrumented future onto the single-threaded Tokio runtime.

This method simply wraps a call to current_thread::Runtime::spawn, instrumenting the spawned future beforehand.

pub fn block_on<F, R, E>(&mut self, future: F) -> Result<R, E>

where F: 'static + Future<Item = R, Error = E>, R: 'static, E: 'static,

Instruments and runs the provided future, blocking the current thread until the future completes.

This function can be used to synchronously block the current thread until the provided future has resolved either successfully or with an error. The result of the future is then returned from this function call.

Note that this function will also execute any spawned futures on the current thread, but will not block until these other spawned futures have completed. Once the function returns, any uncompleted futures remain pending in the Runtime instance. These futures will not run until block_on or run is called again.

The caller is responsible for ensuring that other spawned futures complete execution by calling block_on or run.

This method simply wraps a call to current_thread::Runtime::block_on, instrumenting the spawned future beforehand.

Panics

This function panics if the executor is at capacity, if the provided future panics, or if called within an asynchronous execution context.

pub fn handle(&self) -> Instrumented<Handle>

Get a new instrumented handle to spawn futures on the single-threaded Tokio runtime

Different to the runtime itself, the handle can be sent to different threads.

The instrumented handle functions identically to a tokio::runtime::current_thread::Handle, but instruments the spawned futures prior to spawning them.

impl<T> Instrumented<T>

pub fn span(&self) -> &Span

Borrows the Span that this type is instrumented by.

pub fn span_mut(&mut self) -> &mut Span

Mutably borrows the Span that this type is instrumented by.

pub fn inner(&self) -> &T

Borrows the wrapped type.

pub fn inner_mut(&mut self) -> &mut T

Mutably borrows the wrapped type.

pub fn inner_pin_ref(self: Pin<&Self>) -> Pin<&T>

Available on crate feature std-future only.

Get a pinned reference to the wrapped type.

pub fn inner_pin_mut(self: Pin<&mut Self>) -> Pin<&mut T>

Available on crate feature std-future only.

Get a pinned mutable reference to the wrapped type.

pub fn into_inner(self) -> T

Consumes the Instrumented, returning the wrapped type.

Note that this drops the span.

Trait Implementations

impl<T: Clone> Clone for Instrumented<T>

fn clone(&self) -> Instrumented<T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for Instrumented<T>

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

Formats the value using the given formatter.

impl<T, F> Executor<F> for Instrumented<T>

where T: Executor<Instrumented<F>>, F: Future<Item = (), Error = ()>,

fn execute(&self, future: F) -> Result<(), ExecuteError<F>>

Spawns a future to run on this Executor, typically in the “background”.

impl<T> Executor for Instrumented<T>

where T: Executor,

fn spawn( &mut self, future: Box<dyn Future<Error = (), Item = ()> + Send + 'static>, ) -> Result<(), SpawnError>

Spawns a future object to run on this executor.

fn status(&self) -> Result<(), SpawnError>

Provides a best effort hint to whether or not spawn will succeed.

impl<T: Future> Future for Instrumented<T>

Available on crate feature std-future only.

type Output = <T as Future>::Output

The type of value produced on completion.

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Attempts to resolve the future to a final value, registering the current task for wakeup if the value is not yet available.

impl<T: Future> Future for Instrumented<T>

Available on crate feature futures-01 only.

type Item = <T as Future>::Item

The type of value that this future will resolved with if it is successful.

type Error = <T as Future>::Error

The type of error that this future will resolve with if it fails in a normal fashion.

fn poll(&mut self) -> Poll<Self::Item, Self::Error>

Query this future to see if its value has become available, registering interest if it is not.

fn wait(self) -> Result<Self::Item, Self::Error>

where Self: Sized,

Block the current thread until this future is resolved.

fn map<F, U>(self, f: F) -> Map<Self, F>

where F: FnOnce(Self::Item) -> U, Self: Sized,

Map this future’s result to a different type, returning a new future of the resulting type.

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

where F: FnOnce(Self::Error) -> E, Self: Sized,

Map this future’s error to a different error, returning a new future.

fn from_err<E>(self) -> FromErr<Self, E>

where E: From<Self::Error>, Self: Sized,

Map this future’s error to any error implementing From for this future’s Error, returning a new future.

fn then<F, B>(self, f: F) -> Then<Self, B, F>

where F: FnOnce(Result<Self::Item, Self::Error>) -> B, B: IntoFuture, Self: Sized,

Chain on a computation for when a future finished, passing the result of the future to the provided closure f.

fn and_then<F, B>(self, f: F) -> AndThen<Self, B, F>

where F: FnOnce(Self::Item) -> B, B: IntoFuture<Error = Self::Error>, Self: Sized,

Execute another future after this one has resolved successfully.

fn or_else<F, B>(self, f: F) -> OrElse<Self, B, F>

where F: FnOnce(Self::Error) -> B, B: IntoFuture<Item = Self::Item>, Self: Sized,

Execute another future if this one resolves with an error.

fn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future>

where B: IntoFuture<Item = Self::Item, Error = Self::Error>, Self: Sized,

Waits for either one of two futures to complete.

fn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future>

where B: IntoFuture, Self: Sized,

Waits for either one of two differently-typed futures to complete.

fn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future>

where B: IntoFuture<Error = Self::Error>, Self: Sized,

Joins the result of two futures, waiting for them both to complete.

fn join3<B, C>( self, b: B, c: C, ) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future>

where B: IntoFuture<Error = Self::Error>, C: IntoFuture<Error = Self::Error>, Self: Sized,

Same as join, but with more futures.

fn join4<B, C, D>( self, b: B, c: C, d: D, ) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future>

where B: IntoFuture<Error = Self::Error>, C: IntoFuture<Error = Self::Error>, D: IntoFuture<Error = Self::Error>, Self: Sized,

Same as join, but with more futures.

fn join5<B, C, D, E>( self, b: B, c: C, d: D, e: E, ) -> Join5<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future>

where B: IntoFuture<Error = Self::Error>, C: IntoFuture<Error = Self::Error>, D: IntoFuture<Error = Self::Error>, E: IntoFuture<Error = Self::Error>, Self: Sized,

Same as join, but with more futures.

fn into_stream(self) -> IntoStream<Self>

where Self: Sized,

Convert this future into a single element stream.

fn flatten(self) -> Flatten<Self>

where Self::Item: IntoFuture, <Self::Item as IntoFuture>::Error: From<Self::Error>, Self: Sized,

Flatten the execution of this future when the successful result of this future is itself another future.

fn flatten_stream(self) -> FlattenStream<Self>

where Self::Item: Stream<Error = Self::Error>, Self: Sized,

Flatten the execution of this future when the successful result of this future is a stream.

fn fuse(self) -> Fuse<Self>

where Self: Sized,

Fuse a future such that poll will never again be called once it has completed.

fn inspect<F>(self, f: F) -> Inspect<Self, F>

where F: FnOnce(&Self::Item), Self: Sized,

Do something with the item of a future, passing it on.

fn catch_unwind(self) -> CatchUnwind<Self>

where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the future.

fn shared(self) -> Shared<Self>

where Self: Sized,

Create a cloneable handle to this future where all handles will resolve to the same result.

impl<T> LocalSpawn for Instrumented<T>

where T: LocalSpawn,

fn spawn_local_obj( &self, future: LocalFutureObj<'static, ()>, ) -> Result<(), SpawnError>

Spawns a future that will be run to completion.

Errors

The executor may be unable to spawn tasks. Spawn errors should represent relatively rare scenarios, such as the executor having been shut down so that it is no longer able to accept tasks.

fn status_local(&self) -> Result<(), SpawnError>

Determines whether the executor is able to spawn new tasks.

This method will return Ok when the executor is likely (but not guaranteed) to accept a subsequent spawn attempt. Likewise, an Err return means that spawn is likely, but not guaranteed, to yield an error.

impl<I, T> Sink<I> for Instrumented<T>

where T: Sink<I>,

Available on crate features futures-03 and std-future only.

type Error = <T as Sink<I>>::Error

The type of value produced by the sink when an error occurs.

fn poll_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<(), Self::Error>>

Attempts to prepare the Sink to receive a value.

fn start_send(self: Pin<&mut Self>, item: I) -> Result<(), Self::Error>

Begin the process of sending a value to the sink. Each call to this function must be preceded by a successful call to poll_ready which returned Poll::Ready(Ok(())).

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

Flush any remaining output from this sink.

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

Flush any remaining output and close this sink, if necessary.

impl<T: Sink> Sink for Instrumented<T>

Available on crate feature futures-01 only.

type SinkItem = <T as Sink>::SinkItem

The type of value that the sink accepts.

type SinkError = <T as Sink>::SinkError

The type of value produced by the sink when an error occurs.

fn start_send( &mut self, item: Self::SinkItem, ) -> StartSend<Self::SinkItem, Self::SinkError>

Begin the process of sending a value to the sink.

fn poll_complete(&mut self) -> Poll<(), Self::SinkError>

Flush all output from this sink, if necessary.

fn close(&mut self) -> Result<Async<()>, Self::SinkError>

A method to indicate that no more values will ever be pushed into this sink.

fn wait(self) -> Wait<Self>

where Self: Sized,

Creates a new object which will produce a synchronous sink.

fn with<U, F, Fut>(self, f: F) -> With<Self, U, F, Fut>

where F: FnMut(U) -> Fut, Fut: IntoFuture<Item = Self::SinkItem>, <Fut as IntoFuture>::Error: From<Self::SinkError>, Self: Sized,

Composes a function in front of the sink.

fn with_flat_map<U, F, St>(self, f: F) -> WithFlatMap<Self, U, F, St>

where F: FnMut(U) -> St, St: Stream<Item = Self::SinkItem, Error = Self::SinkError>, Self: Sized,

Composes a function in front of the sink.

fn sink_map_err<F, E>(self, f: F) -> SinkMapErr<Self, F>

where F: FnOnce(Self::SinkError) -> E, Self: Sized,

Transforms the error returned by the sink.

fn sink_from_err<E>(self) -> SinkFromErr<Self, E>

where E: From<Self::SinkError>, Self: Sized,

Map this sink’s error to any error implementing From for this sink’s Error, returning a new sink.

fn buffer(self, amt: usize) -> Buffer<Self>

where Self: Sized,

Adds a fixed-size buffer to the current sink.

fn fanout<S>(self, other: S) -> Fanout<Self, S>

where Self: Sized, Self::SinkItem: Clone, S: Sink<SinkItem = Self::SinkItem, SinkError = Self::SinkError>,

Fanout items to multiple sinks.

fn flush(self) -> Flush<Self>

where Self: Sized,

A future that completes when the sink has finished processing all pending requests.

fn send(self, item: Self::SinkItem) -> Send<Self>

where Self: Sized,

A future that completes after the given item has been fully processed into the sink, including flushing.

fn send_all<S>(self, stream: S) -> SendAll<Self, S>

where S: Stream<Item = Self::SinkItem>, Self::SinkError: From<<S as Stream>::Error>, Self: Sized,

A future that completes after the given stream has been fully processed into the sink, including flushing.

impl<T> Spawn for Instrumented<T>

where T: Spawn,

fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError>

Spawns a future that will be run to completion.

Errors

The executor may be unable to spawn tasks. Spawn errors should represent relatively rare scenarios, such as the executor having been shut down so that it is no longer able to accept tasks.

fn status(&self) -> Result<(), SpawnError>

Determines whether the executor is able to spawn new tasks.

This method will return Ok when the executor is likely (but not guaranteed) to accept a subsequent spawn attempt. Likewise, an Err return means that spawn is likely, but not guaranteed, to yield an error.

impl<T: Stream> Stream for Instrumented<T>

Available on crate feature futures-01 only.

type Item = <T as Stream>::Item

The type of item this stream will yield on success.

type Error = <T as Stream>::Error

The type of error this stream may generate.

fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error>

Attempt to pull out the next value of this stream, returning None if the stream is finished.

fn wait(self) -> Wait<Self>

where Self: Sized,

Creates an iterator which blocks the current thread until each item of this stream is resolved.

fn into_future(self) -> StreamFuture<Self>

where Self: Sized,

Converts this stream into a Future.

fn map<U, F>(self, f: F) -> Map<Self, F>

where F: FnMut(Self::Item) -> U, Self: Sized,

Converts a stream of type T to a stream of type U.

fn map_err<U, F>(self, f: F) -> MapErr<Self, F>

where F: FnMut(Self::Error) -> U, Self: Sized,

Converts a stream of error type T to a stream of error type U.

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.

fn filter_map<F, B>(self, f: F) -> FilterMap<Self, F>

where F: FnMut(Self::Item) -> Option<B>, Self: Sized,

Filters the values produced by this stream while simultaneously mapping them to a different type.

fn then<F, U>(self, f: F) -> Then<Self, F, U>

where F: FnMut(Result<Self::Item, Self::Error>) -> U, U: IntoFuture, Self: Sized,

Chain on a computation for when a value is ready, passing the resulting item to the provided closure f.

fn and_then<F, U>(self, f: F) -> AndThen<Self, F, U>

where F: FnMut(Self::Item) -> U, U: IntoFuture<Error = Self::Error>, Self: Sized,

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

fn or_else<F, U>(self, f: F) -> OrElse<Self, F, U>

where F: FnMut(Self::Error) -> U, U: IntoFuture<Item = Self::Item>, Self: Sized,

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

fn collect(self) -> Collect<Self>

where Self: Sized,

Collect all of the values of this stream into a vector, returning a future representing the result of that computation.

fn concat2(self) -> Concat2<Self>

where Self: Sized, Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default,

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result.

fn concat(self) -> Concat<Self>

where Self: Sized, Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator,

👎Deprecated since 0.1.14: please use Stream::concat2 instead

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result.

fn fold<F, T, Fut>(self, init: T, f: F) -> Fold<Self, F, Fut, T>

where F: FnMut(T, Self::Item) -> Fut, Fut: IntoFuture<Item = T>, Self::Error: From<<Fut as IntoFuture>::Error>, Self: Sized,

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

fn flatten(self) -> Flatten<Self>

where Self::Item: Stream, <Self::Item as Stream>::Error: From<Self::Error>, Self: Sized,

Flattens a stream of streams into just one continuous stream.

fn skip_while<P, R>(self, pred: P) -> SkipWhile<Self, P, R>

where P: FnMut(&Self::Item) -> R, R: IntoFuture<Item = bool, Error = Self::Error>, Self: Sized,

Skip elements on this stream while the predicate provided resolves to true.

fn take_while<P, R>(self, pred: P) -> TakeWhile<Self, P, R>

where P: FnMut(&Self::Item) -> R, R: IntoFuture<Item = bool, Error = Self::Error>, Self: Sized,

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

fn for_each<F, U>(self, f: F) -> ForEach<Self, F, U>

where F: FnMut(Self::Item) -> U, U: IntoFuture<Item = (), Error = Self::Error>, Self: Sized,

Runs this stream to completion, executing the provided closure for each element on the stream.

fn from_err<E>(self) -> FromErr<Self, E>

where E: From<Self::Error>, Self: Sized,

Map this stream’s error to any error implementing From for this stream’s Error, returning a new stream.

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

where Self: Sized,

Creates a new stream of at most amt items of the underlying stream.

fn skip(self, amt: u64) -> Skip<Self>

where Self: Sized,

Creates a new stream which skips amt items of the underlying stream.

fn fuse(self) -> Fuse<Self>

where Self: Sized,

Fuse a stream such that poll will never again be called once it has finished.

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

where Self: Sized,

Borrows a stream, rather than consuming it.

fn catch_unwind(self) -> CatchUnwind<Self>

where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the stream.

fn buffered(self, amt: usize) -> Buffered<Self>

where Self::Item: IntoFuture<Error = Self::Error>, Self: Sized,

An adaptor for creating a buffered list of pending futures.

fn buffer_unordered(self, amt: usize) -> BufferUnordered<Self>

where Self::Item: IntoFuture<Error = Self::Error>, Self: Sized,

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

fn merge<S>(self, other: S) -> Merge<Self, S>

where S: Stream<Error = Self::Error>, Self: Sized,

👎Deprecated: functionality provided by select now

An adapter for merging the output of two streams.

fn zip<S>(self, other: S) -> Zip<Self, S>

where S: Stream<Error = Self::Error>, Self: Sized,

An adapter for zipping two streams together.

fn chain<S>(self, other: S) -> Chain<Self, S>

where S: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

Adapter for chaining two stream.

fn peekable(self) -> Peekable<Self>

where Self: Sized,

Creates a new stream which exposes a peek method.

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

where Self: Sized,

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

fn select<S>(self, other: S) -> Select<Self, S>

where S: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

Creates a stream that selects the next element from either this stream or the provided one, whichever is ready first.

fn forward<S>(self, sink: S) -> Forward<Self, S>

where S: Sink<SinkItem = Self::Item>, Self::Error: From<<S as Sink>::SinkError>, Self: Sized,

A future that completes after the given stream has been fully processed into the sink, including flushing.

fn split(self) -> (SplitSink<Self>, SplitStream<Self>)

where Self: Sized + Sink,

Splits this Stream + Sink object into separate Stream and Sink objects.

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.

fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>

where F: FnMut(&Self::Error), Self: Sized,

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

impl<T: Stream> Stream for Instrumented<T>

Available on crate features futures-03 and std-future only.

type Item = <T as Stream>::Item

Values yielded by the stream.

fn poll_next( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Self::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.

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

Returns the bounds on the remaining length of the stream.

impl<T, F> TypedExecutor<F> for Instrumented<T>

where T: TypedExecutor<Instrumented<F>>,

fn spawn(&mut self, future: F) -> Result<(), SpawnError>

Spawns a future to run on this executor.

fn status(&self) -> Result<(), SpawnError>

Provides a best effort hint to whether or not spawn will succeed.

impl<'pin, T> Unpin for Instrumented<T>

where PinnedFieldsOf<__Instrumented<'pin, T>>: Unpin,