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mirror of https://github.com/fafhrd91/actix-net synced 2024-12-19 17:52:38 +01:00
actix-net/src/service/mod.rs
2018-09-12 13:34:53 -07:00

189 lines
5.0 KiB
Rust

use futures::{Future, IntoFuture};
/// re-export for convinience
pub use tower_service::{NewService, Service};
mod and_then;
mod apply;
mod fn_service;
mod fn_state_service;
mod from_err;
mod map;
mod map_err;
mod map_init_err;
pub use self::and_then::{AndThen, AndThenNewService};
pub use self::apply::{Apply, ApplyNewService};
pub use self::fn_service::{FnNewService, FnService};
pub use self::fn_state_service::{FnStateNewService, FnStateService};
pub use self::from_err::FromErr;
pub use self::map::{Map, MapNewService};
pub use self::map_err::{MapErr, MapErrNewService};
pub use self::map_init_err::MapInitErr;
/// An extension trait for `Service`s that provides a variety of convenient
/// adapters
pub trait ServiceExt: Service {
fn apply<F, R, Req>(self, f: F) -> Apply<Self, F, R, Req>
where
Self: Sized,
Self::Error: Into<<R::Future as Future>::Error>,
F: Fn(Req, &mut Self) -> R,
R: IntoFuture,
{
Apply::new(f, self)
}
/// 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<F, B>(self, service: F) -> AndThen<Self, B>
where
Self: Sized,
F: IntoService<B>,
B: Service<Request = Self::Response, Error = Self::Error>,
{
AndThen::new(self, service.into_service())
}
/// Map this service's error to any error implementing `From` for
/// this service`s `Error`.
///
/// Note that this function consumes the receiving service and returns a
/// wrapped version of it.
fn from_err<E>(self) -> FromErr<Self, E>
where
Self: Sized,
E: From<Self::Error>,
{
FromErr::new(self)
}
/// 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, R>
where
Self: Sized,
F: Fn(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. 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.
fn map_err<F, E>(self, f: F) -> MapErr<Self, F, E>
where
Self: Sized,
F: Fn(Self::Error) -> E,
{
MapErr::new(self, f)
}
}
pub trait NewServiceExt: NewService {
fn apply<F, R, Req>(self, f: F) -> ApplyNewService<Self, F, R, Req>
where
Self: Sized,
Self::Error: Into<<R::Future as Future>::Error>,
F: Fn(Req, &mut Self::Service) -> R + Clone,
R: IntoFuture,
{
ApplyNewService::new(f, self)
}
fn and_then<F, B>(self, new_service: F) -> AndThenNewService<Self, B>
where
Self: Sized,
F: IntoNewService<B>,
B: NewService<
Request = Self::Response,
Error = Self::Error,
InitError = Self::InitError,
>,
{
AndThenNewService::new(self, new_service)
}
fn map<F, R>(self, f: F) -> MapNewService<Self, F, R>
where
Self: Sized,
F: Fn(Self::Response) -> R,
{
MapNewService::new(self, f)
}
fn map_err<F, E>(self, f: F) -> MapErrNewService<Self, F, E>
where
Self: Sized,
F: Fn(Self::Error) -> E,
{
MapErrNewService::new(self, f)
}
fn map_init_err<F, E>(self, f: F) -> MapInitErr<Self, F, E>
where
Self: Sized,
F: Fn(Self::InitError) -> E,
{
MapInitErr::new(self, f)
}
}
impl<T: ?Sized> ServiceExt for T where T: Service {}
impl<T: ?Sized> NewServiceExt for T where T: NewService {}
/// Trait for types that can be converted to a `Service`
pub trait IntoService<T>
where
T: Service,
{
/// Convert to a `Service`
fn into_service(self) -> T;
}
/// Trait for types that can be converted to a Service
pub trait IntoNewService<T>
where
T: NewService,
{
/// Convert to an `NewService`
fn into_new_service(self) -> T;
}
impl<T> IntoService<T> for T
where
T: Service,
{
fn into_service(self) -> T {
self
}
}
impl<T> IntoNewService<T> for T
where
T: NewService,
{
fn into_new_service(self) -> T {
self
}
}