Struct ntex_service::dev::ServiceChain

pub struct ServiceChain<Svc, Req> { /* private fields */ }

Chain builder - chain allows to compose multiple service into one service.

Implementations

impl<Svc: Service<Req>, Req> ServiceChain<Svc, Req>

pub fn and_then<Next, F>( self, service: F ) -> ServiceChain<AndThen<Svc, Next>, Req>

where Self: Sized, F: IntoService<Next, Svc::Response>, Next: Service<Svc::Response, Error = Svc::Error>,

Call another service after call to this one has resolved successfully.

This function can be used to chain two services together and ensure that the second service isn’t called until call to the fist service have finished. Result of the call to the first service is used as an input parameter for the second service’s call.

Note that this function consumes the receiving service and returns a wrapped version of it.

pub fn then<Next, F>(self, service: F) -> ServiceChain<Then<Svc, Next>, Req>

where Self: Sized, F: IntoService<Next, Result<Svc::Response, Svc::Error>>, Next: Service<Result<Svc::Response, Svc::Error>, Error = Svc::Error>,

Chain on a computation for when a call to the service finished, passing the result of the call to the next service U.

Note that this function consumes the receiving pipeline and returns a wrapped version of it.

pub fn map<F, Res>(self, f: F) -> ServiceChain<Map<Svc, F, Req, Res>, Req>

where Self: Sized, F: Fn(Svc::Response) -> Res,

Map this service’s output to a different type, returning a new service of the resulting type.

This function is similar to the Option::map or Iterator::map where it will change the type of the underlying service.

Note that this function consumes the receiving service and returns a wrapped version of it, similar to the existing map methods in the standard library.

pub fn map_err<F, Err>(self, f: F) -> ServiceChain<MapErr<Svc, F, Err>, Req>

where Self: Sized, F: Fn(Svc::Error) -> Err,

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

This function is similar to the Result::map_err where it will change the error type of the underlying service. This is useful for example to ensure that services have the same error type.

Note that this function consumes the receiving service and returns a wrapped version of it.

pub fn apply_fn<F, R, In, Out, Err>( self, f: F ) -> ServiceChain<Apply<Svc, Req, F, R, In, Out, Err>, In>

where F: Fn(In, Pipeline<Svc>) -> R, R: Future<Output = Result<Out, Err>>, Svc: Service<Req>, Err: From<Svc::Error>,

Use function as middleware for current service.

Short version of apply_fn(chain(...), fn)

pub fn into_pipeline(self) -> Pipeline<Svc>

Create service pipeline

Trait Implementations

impl<Svc, Req> Clone for ServiceChain<Svc, Req>

where Svc: Clone,

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<Svc, Req> Debug for ServiceChain<Svc, Req>

where Svc: Debug,

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

Formats the value using the given formatter.

impl<Svc: Service<Req>, Req> Service<Req> for ServiceChain<Svc, Req>

type Response = <Svc as Service<Req>>::Response

Responses given by the service.

type Error = <Svc as Service<Req>>::Error

Errors produced by the service when polling readiness or executing call.

async fn ready(&self, ctx: ServiceCtx<'_, Self>) -> Result<(), Self::Error>

Returns when the service is able to process requests.

async fn shutdown(&self)

Shutdown service.

async fn call( &self, req: Req, ctx: ServiceCtx<'_, Self> ) -> Result<Self::Response, Self::Error>

Process the request and return the response asynchronously.

fn map<F, Res>(self, f: F) -> ServiceChain<Map<Self, F, Req, Res>, Req>

where Self: Sized, F: Fn(Self::Response) -> Res,

Map this service’s output to a different type, returning a new service of the resulting type.

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

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

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