[−][src]Struct tower::util::Optional
Optionally forwards requests to an inner service.
If the inner service is None
, Error::None
is returned as the response.
Methods
impl<T> Optional<T>
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pub fn new<Request>(inner: Option<T>) -> Optional<T> where
T: Service<Request>,
<T as Service<Request>>::Error: Into<Box<dyn Error + 'static + Send + Sync>>,
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T: Service<Request>,
<T as Service<Request>>::Error: Into<Box<dyn Error + 'static + Send + Sync>>,
Create a new OptionService
Trait Implementations
impl<T, Request> Service<Request> for Optional<T> where
T: Service<Request>,
<T as Service<Request>>::Error: Into<Box<dyn Error + 'static + Send + Sync>>,
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T: Service<Request>,
<T as Service<Request>>::Error: Into<Box<dyn Error + 'static + Send + Sync>>,
type Response = <T as Service<Request>>::Response
Responses given by the service.
type Error = Box<dyn Error + 'static + Send + Sync>
Errors produced by the service.
type Future = ResponseFuture<<T as Service<Request>>::Future>
The future response value.
fn poll_ready(
&mut self
) -> Result<Async<()>, <Optional<T> as Service<Request>>::Error>
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&mut self
) -> Result<Async<()>, <Optional<T> as Service<Request>>::Error>
fn call(
&mut self,
request: Request
) -> <Optional<T> as Service<Request>>::Future
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&mut self,
request: Request
) -> <Optional<T> as Service<Request>>::Future
Auto Trait Implementations
impl<T> Unpin for Optional<T> where
T: Unpin,
T: Unpin,
impl<T> Send for Optional<T> where
T: Send,
T: Send,
impl<T> Sync for Optional<T> where
T: Sync,
T: Sync,
impl<T> UnwindSafe for Optional<T> where
T: UnwindSafe,
T: UnwindSafe,
impl<T> RefUnwindSafe for Optional<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
Blanket Implementations
impl<T, Request> ServiceExt<Request> for T where
T: Service<Request> + ?Sized,
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T: Service<Request> + ?Sized,
fn ready(self) -> Ready<Self, Request> where
Self: Sized,
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Self: Sized,
A future yielding the service when it is ready to accept a request.
fn oneshot(self, req: Request) -> Oneshot<Self, Request> where
Self: Sized,
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Self: Sized,
Consume this Service
, calling with the providing request once it is ready.
fn call_all<S>(self, reqs: S) -> CallAll<Self, S> where
Self: Sized,
Self::Error: Into<Box<dyn Error + Send + Sync>>,
S: Stream<Item = Request>,
S::Error: Into<Box<dyn Error + Send + Sync>>,
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Self: Sized,
Self::Error: Into<Box<dyn Error + Send + Sync>>,
S: Stream<Item = Request>,
S::Error: Into<Box<dyn Error + Send + Sync>>,
Process all requests from the given Stream
, and produce a Stream
of their responses. Read more
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<C, Target> MakeConnection<Target> for C where
C: Service<Target>,
<C as Service<Target>>::Response: AsyncRead,
<C as Service<Target>>::Response: AsyncWrite,
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C: Service<Target>,
<C as Service<Target>>::Response: AsyncRead,
<C as Service<Target>>::Response: AsyncWrite,
type Connection = <C as Service<Target>>::Response
The transport provided by this service
type Error = <C as Service<Target>>::Error
Errors produced by the connecting service
type Future = <C as Service<Target>>::Future
The future that eventually produces the transport
fn poll_ready(
&mut self
) -> Result<Async<()>, <C as MakeConnection<Target>>::Error>
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&mut self
) -> Result<Async<()>, <C as MakeConnection<Target>>::Error>
fn make_connection(
&mut self,
target: Target
) -> <C as MakeConnection<Target>>::Future
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&mut self,
target: Target
) -> <C as MakeConnection<Target>>::Future
impl<M, S, Target, Request> MakeService<Target, Request> for M where
M: Service<Target, Response = S>,
S: Service<Request>,
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M: Service<Target, Response = S>,
S: Service<Request>,
type Response = <S as Service<Request>>::Response
Responses given by the service
type Error = <S as Service<Request>>::Error
Errors produced by the service
type Service = S
The Service
value created by this factory
type MakeError = <M as Service<Target>>::Error
Errors produced while building a service.
type Future = <M as Service<Target>>::Future
The future of the Service
instance.
fn poll_ready(
&mut self
) -> Result<Async<()>, <M as MakeService<Target, Request>>::MakeError>
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&mut self
) -> Result<Async<()>, <M as MakeService<Target, Request>>::MakeError>
fn make_service(
&mut self,
target: Target
) -> <M as MakeService<Target, Request>>::Future
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&mut self,
target: Target
) -> <M as MakeService<Target, Request>>::Future