Struct rama::layer::MapResult

pub struct MapResult<S, F> { /* private fields */ }
Expand description

Maps this service’s result type (Result<Self::Response, Self::Error>) to a different value, regardless of whether the future succeeds or fails.

This is similar to the MapResponse and MapErr combinators, except that the same function is invoked when the service’s future completes, whether it completes successfully or fails. This function takes the Result returned by the service’s future, and returns a Result.

Like the standard library’s Result::and_then, this method can be used to implement control flow based on Result values. For example, it may be used to implement error recovery, by turning some Err responses from the service into Ok responses. Similarly, some successful responses from the service could be rejected, by returning an Err conditionally, depending on the value inside the [Ok.] Finally, this method can also be used to implement behaviors that must run when a service’s future completes, regardless of whether it succeeded or failed.

This method can be used to change the Response type of the service into a different type. It can also be used to change the Error type of the service.

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impl<S, F> MapResult<S, F>

pub const fn new(inner: S, f: F) -> MapResult<S, F>

Creates a new MapResult service.

pub fn get_ref(&self) -> &S

Gets a reference to the underlying service.

pub fn into_inner(self) -> S

Consumes self, returning the underlying service.

Trait Implementations§

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impl<S, F> Clone for MapResult<S, F>
where S: Clone, F: Clone,

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fn clone(&self) -> MapResult<S, F>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<S, F> Debug for MapResult<S, F>
where S: Debug,

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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<S, F, State, Request, Response, Error> Service<State, Request> for MapResult<S, F>
where S: Service<State, Request>, F: FnOnce(Result<<S as Service<State, Request>>::Response, <S as Service<State, Request>>::Error>) -> Result<Response, Error> + Clone + Send + Sync + 'static, State: Clone + Send + Sync + 'static, Request: Send + 'static, Response: Send + 'static, Error: Send + Sync + 'static,

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type Response = Response

The type of response returned by the service.
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type Error = Error

The type of error returned by the service.
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async fn serve( &self, ctx: Context<State>, req: Request, ) -> Result<<MapResult<S, F> as Service<State, Request>>::Response, <MapResult<S, F> as Service<State, Request>>::Error>

Serve a response or error for the given request, using the given context.
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fn boxed(self) -> BoxService<S, Request, Self::Response, Self::Error>

Box this service to allow for dynamic dispatch.

Auto Trait Implementations§

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impl<S, F> Freeze for MapResult<S, F>
where S: Freeze, F: Freeze,

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impl<S, F> RefUnwindSafe for MapResult<S, F>

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impl<S, F> Send for MapResult<S, F>
where S: Send, F: Send,

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impl<S, F> Sync for MapResult<S, F>
where S: Sync, F: Sync,

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impl<S, F> Unpin for MapResult<S, F>
where S: Unpin, F: Unpin,

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impl<S, F> UnwindSafe for MapResult<S, F>
where S: UnwindSafe, F: UnwindSafe,

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

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<S, State, Request, Connection> ConnectorService<State, Request> for S
where S: Service<State, Request, Response = EstablishedClientConnection<Connection, State, Request>>, <S as Service<State, Request>>::Error: Into<Box<dyn Error + Send + Sync>>,

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type Connection = Connection

Connection returned by the ConnectorService
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type Error = <S as Service<State, Request>>::Error

Error returned in case of connection / setup failure
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fn connect( &self, ctx: Context<State>, req: Request, ) -> impl Future<Output = Result<EstablishedClientConnection<<S as ConnectorService<State, Request>>::Connection, State, Request>, <S as ConnectorService<State, Request>>::Error>> + Send

Establish a connection, which often involves some kind of handshake, or connection revival.
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impl<T> Conv for T

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fn conv<T>(self) -> T
where Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> FmtForward for T

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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>
where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>
where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FutureExt for T

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fn with_context(self, otel_cx: Context) -> WithContext<Self>

Attaches the provided Context to this type, returning a WithContext wrapper. Read more
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fn with_current_context(self) -> WithContext<Self>

Attaches the current Context to this type, returning a WithContext wrapper. Read more
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impl<State, S, Body> HttpClientExt<State> for S
where S: Service<State, Request<Body>, Response = Response<Body>>, <S as Service<State, Request<Body>>>::Error: Into<Box<dyn Error + Send + Sync>>,

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type ExecuteResponse = Response<Body>

The response type returned by the execute method.
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type ExecuteError = <S as Service<State, Request<Body>>>::Error

The error type returned by the execute method.
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fn get( &self, url: impl IntoUrl, ) -> RequestBuilder<'_, S, State, <S as HttpClientExt<State>>::ExecuteResponse>

Convenience method to make a GET request to a URL. Read more
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fn post( &self, url: impl IntoUrl, ) -> RequestBuilder<'_, S, State, <S as HttpClientExt<State>>::ExecuteResponse>

Convenience method to make a POST request to a URL. Read more
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fn put( &self, url: impl IntoUrl, ) -> RequestBuilder<'_, S, State, <S as HttpClientExt<State>>::ExecuteResponse>

Convenience method to make a PUT request to a URL. Read more
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fn patch( &self, url: impl IntoUrl, ) -> RequestBuilder<'_, S, State, <S as HttpClientExt<State>>::ExecuteResponse>

Convenience method to make a PATCH request to a URL. Read more
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fn delete( &self, url: impl IntoUrl, ) -> RequestBuilder<'_, S, State, <S as HttpClientExt<State>>::ExecuteResponse>

Convenience method to make a DELETE request to a URL. Read more
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fn head( &self, url: impl IntoUrl, ) -> RequestBuilder<'_, S, State, <S as HttpClientExt<State>>::ExecuteResponse>

Convenience method to make a HEAD request to a URL. Read more
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fn request( &self, method: Method, url: impl IntoUrl, ) -> RequestBuilder<'_, S, State, <S as HttpClientExt<State>>::ExecuteResponse>

Start building a Request with the Method and Url. Read more
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fn execute( &self, ctx: Context<State>, request: Request<Body>, ) -> impl Future<Output = Result<<S as HttpClientExt<State>>::ExecuteResponse, <S as HttpClientExt<State>>::ExecuteError>>

Executes a Request. Read more
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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

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where U: From<T>,

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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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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<State, S, R> IntoEndpointService<State, (State, R)> for S
where State: Clone + Send + Sync + 'static, S: Service<State, Request<Body>, Response = R, Error = Infallible>, R: IntoResponse + Send + Sync + 'static,

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fn into_endpoint_service( self, ) -> impl Service<State, Request<Body>, Response = Response<Body>, Error = Infallible>

convert the type into a rama_core::Service.
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where T: ?Sized,

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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
where Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
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where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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where R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
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where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
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where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
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where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

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where T: Policy<S, B, E>, P: Policy<S, B, E>,

Create a new Policy that returns Action::Follow only if self and other return Action::Follow. Read more
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where T: Policy<S, B, E>, P: Policy<S, B, E>,

Create a new Policy that returns Action::Follow if either self or other returns Action::Follow. Read more
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type Output = T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

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where Self: Borrow<B>, B: ?Sized,

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