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use crate::{
and_then::{AndThenService, AndThenServiceFactory},
map::Map,
map_err::MapErr,
transform_err::TransformMapInitErr,
IntoService, IntoServiceFactory, Service, ServiceFactory, Transform,
};
/// An extension trait for [`Service`]s that provides a variety of convenient adapters.
pub trait ServiceExt<Req>: Service<Req> {
/// 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.
fn map<F, R>(self, f: F) -> Map<Self, F, Req, R>
where
Self: Sized,
F: FnMut(Self::Response) -> R,
{
Map::new(self, f)
}
/// 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. For example, this can be useful to
/// ensure that services have the same error type.
///
/// Note that this function consumes the receiving service and returns a
/// wrapped version of it.
fn map_err<F, E>(self, f: F) -> MapErr<Self, Req, F, E>
where
Self: Sized,
F: Fn(Self::Error) -> E,
{
MapErr::new(self, f)
}
/// 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.
fn and_then<I, S1>(self, service: I) -> AndThenService<Self, S1, Req>
where
Self: Sized,
I: IntoService<S1, Self::Response>,
S1: Service<Self::Response, Error = Self::Error>,
{
AndThenService::new(self, service.into_service())
}
}
impl<S, Req> ServiceExt<Req> for S where S: Service<Req> {}
/// An extension trait for [`ServiceFactory`]s that provides a variety of convenient adapters.
pub trait ServiceFactoryExt<Req>: ServiceFactory<Req> {
/// Map this service's output to a different type, returning a new service
/// of the resulting type.
fn map<F, R>(self, f: F) -> crate::map::MapServiceFactory<Self, F, Req, R>
where
Self: Sized,
F: FnMut(Self::Response) -> R + Clone,
{
crate::map::MapServiceFactory::new(self, f)
}
/// Map this service's error to a different error, returning a new service.
fn map_err<F, E>(self, f: F) -> crate::map_err::MapErrServiceFactory<Self, Req, F, E>
where
Self: Sized,
F: Fn(Self::Error) -> E + Clone,
{
crate::map_err::MapErrServiceFactory::new(self, f)
}
/// Map this factory's init error to a different error, returning a new service.
fn map_init_err<F, E>(self, f: F) -> crate::map_init_err::MapInitErr<Self, F, Req, E>
where
Self: Sized,
F: Fn(Self::InitError) -> E + Clone,
{
crate::map_init_err::MapInitErr::new(self, f)
}
/// Call another service after call to this one has resolved successfully.
fn and_then<I, SF1>(self, factory: I) -> AndThenServiceFactory<Self, SF1, Req>
where
Self: Sized,
Self::Config: Clone,
I: IntoServiceFactory<SF1, Self::Response>,
SF1: ServiceFactory<
Self::Response,
Config = Self::Config,
Error = Self::Error,
InitError = Self::InitError,
>,
{
AndThenServiceFactory::new(self, factory.into_factory())
}
}
impl<SF, Req> ServiceFactoryExt<Req> for SF where SF: ServiceFactory<Req> {}
/// An extension trait for [`Transform`]s that provides a variety of convenient adapters.
pub trait TransformExt<S, Req>: Transform<S, Req> {
/// Return a new `Transform` whose init error is mapped to to a different type.
fn map_init_err<F, E>(self, f: F) -> TransformMapInitErr<Self, S, Req, F, E>
where
Self: Sized,
F: Fn(Self::InitError) -> E + Clone,
{
TransformMapInitErr::new(self, f)
}
}
impl<T, Req> TransformExt<T, Req> for T where T: Transform<T, Req> {}