split service mod

src/configurable.rs

@@ -110,19 +110,18 @@ where
     Fut: IntoFuture<Item = S, Error = Err>,
 {
     fn new(f: F) -> Self {
-        Fn2NewConfigurableService{
+        Fn2NewConfigurableService {
             f,
             err: marker::PhantomData,
             cfg: marker::PhantomData,
             fut: marker::PhantomData,
-            s: marker::PhantomData
+            s: marker::PhantomData,
         }
     }
 }
 
 impl<F, S, Err, Fut, Cfg>
-    IntoNewConfigurableService<Fn2NewConfigurableService<F, S, Err, Fut, Cfg>>
+    IntoNewConfigurableService<Fn2NewConfigurableService<F, S, Err, Fut, Cfg>> for F
-    for F
 where
     S: Service,
     F: Fn(Cfg) -> Fut + 'static,
@@ -144,7 +143,8 @@ where
     }
 }
 
-impl<F, S, Err, Fut, Cfg> NewConfigurableService for Fn2NewConfigurableService<F, S, Err, Fut, Cfg>
+impl<F, S, Err, Fut, Cfg> NewConfigurableService
+    for Fn2NewConfigurableService<F, S, Err, Fut, Cfg>
 where
     S: Service,
     F: Fn(Cfg) -> Fut,

src/lib.rs

@@ -60,7 +60,7 @@ pub mod service;
 pub mod ssl;
 mod worker;
 
-pub use configurable::{NewConfigurableService, IntoNewConfigurableService};
+pub use configurable::{IntoNewConfigurableService, NewConfigurableService};
 pub use connector::{Connector, ConnectorError};
 pub use server::Server;
 pub use service::{IntoNewService, IntoService, NewServiceExt};

src/service.rs

@@ -1,795 +0,0 @@
-use std::cell::RefCell;
-use std::marker;
-use std::rc::Rc;
-
-use futures::{future, future::FutureResult, Async, Future, IntoFuture, Poll};
-use tower_service::{NewService, Service};
-
-pub trait NewServiceExt: NewService {
-    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_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: NewService> NewServiceExt for T {}
-
-/// Trait for types that can be converted to a Service
-pub trait IntoService<T>
-where
-    T: Service,
-{
-    /// Create service
-    fn into(self) -> T;
-}
-
-/// Trait for types that can be converted to a Service
-pub trait IntoNewService<T>
-where
-    T: NewService,
-{
-    /// Create service
-    fn into_new_service(self) -> T;
-}
-
-impl<T> IntoService<T> for T
-where
-    T: Service,
-{
-    fn into(self) -> T {
-        self
-    }
-}
-
-impl<T> IntoNewService<T> for T
-where
-    T: NewService,
-{
-    fn into_new_service(self) -> T {
-        self
-    }
-}
-
-impl<F, Req, Resp, Err, Fut> IntoService<FnService<F, Req, Resp, Err, Fut>> for F
-where
-    F: Fn(Req) -> Fut + 'static,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    fn into(self) -> FnService<F, Req, Resp, Err, Fut> {
-        FnService::new(self)
-    }
-}
-
-pub struct FnService<F, Req, Resp, E, Fut>
-where
-    F: Fn(Req) -> Fut,
-    Fut: IntoFuture<Item = Resp, Error = E>,
-{
-    f: F,
-    req: marker::PhantomData<Req>,
-    resp: marker::PhantomData<Resp>,
-    err: marker::PhantomData<E>,
-}
-
-impl<F, Req, Resp, E, Fut> FnService<F, Req, Resp, E, Fut>
-where
-    F: Fn(Req) -> Fut,
-    Fut: IntoFuture<Item = Resp, Error = E>,
-{
-    pub fn new(f: F) -> Self {
-        FnService {
-            f,
-            req: marker::PhantomData,
-            resp: marker::PhantomData,
-            err: marker::PhantomData,
-        }
-    }
-}
-
-impl<F, Req, Resp, E, Fut> Service for FnService<F, Req, Resp, E, Fut>
-where
-    F: Fn(Req) -> Fut,
-    Fut: IntoFuture<Item = Resp, Error = E>,
-{
-    type Request = Req;
-    type Response = Resp;
-    type Error = E;
-    type Future = Fut::Future;
-
-    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-        Ok(Async::Ready(()))
-    }
-
-    fn call(&mut self, req: Req) -> Self::Future {
-        (self.f)(req).into_future()
-    }
-}
-
-pub struct FnNewService<F, Req, Resp, Err, IErr, Fut>
-where
-    F: Fn(Req) -> Fut,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    f: F,
-    req: marker::PhantomData<Req>,
-    resp: marker::PhantomData<Resp>,
-    err: marker::PhantomData<Err>,
-    ierr: marker::PhantomData<IErr>,
-}
-
-impl<F, Req, Resp, Err, IErr, Fut> FnNewService<F, Req, Resp, Err, IErr, Fut>
-where
-    F: Fn(Req) -> Fut + Clone,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    fn new(f: F) -> Self {
-        FnNewService {
-            f,
-            req: marker::PhantomData,
-            resp: marker::PhantomData,
-            err: marker::PhantomData,
-            ierr: marker::PhantomData,
-        }
-    }
-}
-
-impl<F, Req, Resp, Err, IErr, Fut> NewService for FnNewService<F, Req, Resp, Err, IErr, Fut>
-where
-    F: Fn(Req) -> Fut + Clone,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    type Request = Req;
-    type Response = Resp;
-    type Error = Err;
-    type Service = FnService<F, Req, Resp, Err, Fut>;
-    type InitError = IErr;
-    type Future = FutureResult<Self::Service, Self::InitError>;
-
-    fn new_service(&self) -> Self::Future {
-        future::ok(FnService::new(self.f.clone()))
-    }
-}
-
-impl<F, Req, Resp, Err, IErr, Fut> IntoNewService<FnNewService<F, Req, Resp, Err, IErr, Fut>>
-    for F
-where
-    F: Fn(Req) -> Fut + Clone + 'static,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    fn into_new_service(self) -> FnNewService<F, Req, Resp, Err, IErr, Fut> {
-        FnNewService::new(self)
-    }
-}
-
-impl<F, Req, Resp, Err, IErr, Fut> Clone for FnNewService<F, Req, Resp, Err, IErr, Fut>
-where
-    F: Fn(Req) -> Fut + Clone,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    fn clone(&self) -> Self {
-        Self::new(self.f.clone())
-    }
-}
-
-pub struct FnStateService<S, F, Req, Resp, Err, Fut>
-where
-    F: Fn(&mut S, Req) -> Fut,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    f: F,
-    state: S,
-    req: marker::PhantomData<Req>,
-    resp: marker::PhantomData<Resp>,
-    err: marker::PhantomData<Err>,
-}
-
-impl<S, F, Req, Resp, Err, Fut> FnStateService<S, F, Req, Resp, Err, Fut>
-where
-    F: Fn(&mut S, Req) -> Fut,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    pub fn new(state: S, f: F) -> Self {
-        FnStateService {
-            f,
-            state,
-            req: marker::PhantomData,
-            resp: marker::PhantomData,
-            err: marker::PhantomData,
-        }
-    }
-}
-
-impl<S, F, Req, Resp, Err, Fut> Service for FnStateService<S, F, Req, Resp, Err, Fut>
-where
-    F: Fn(&mut S, Req) -> Fut,
-    Fut: IntoFuture<Item = Resp, Error = Err>,
-{
-    type Request = Req;
-    type Response = Resp;
-    type Error = Err;
-    type Future = Fut::Future;
-
-    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-        Ok(Async::Ready(()))
-    }
-
-    fn call(&mut self, req: Req) -> Self::Future {
-        (self.f)(&mut self.state, req).into_future()
-    }
-}
-
-/// `NewService` for state and handler functions
-pub struct FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> {
-    f: F1,
-    state: F2,
-    s: marker::PhantomData<S>,
-    req: marker::PhantomData<Req>,
-    resp: marker::PhantomData<Resp>,
-    err1: marker::PhantomData<Err1>,
-    err2: marker::PhantomData<Err2>,
-    fut1: marker::PhantomData<Fut1>,
-    fut2: marker::PhantomData<Fut2>,
-}
-
-impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
-    FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
-{
-    fn new(f: F1, state: F2) -> Self {
-        FnStateNewService {
-            f,
-            state,
-            s: marker::PhantomData,
-            req: marker::PhantomData,
-            resp: marker::PhantomData,
-            err1: marker::PhantomData,
-            err2: marker::PhantomData,
-            fut1: marker::PhantomData,
-            fut2: marker::PhantomData,
-        }
-    }
-}
-
-impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> NewService
-    for FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
-where
-    S: 'static,
-    F1: Fn(&mut S, Req) -> Fut1 + Clone + 'static,
-    F2: Fn() -> Fut2,
-    Fut1: IntoFuture<Item = Resp, Error = Err1> + 'static,
-    Fut2: IntoFuture<Item = S, Error = Err2> + 'static,
-    Req: 'static,
-    Resp: 'static,
-    Err1: 'static,
-    Err2: 'static,
-{
-    type Request = Req;
-    type Response = Resp;
-    type Error = Err1;
-    type Service = FnStateService<S, F1, Req, Resp, Err1, Fut1>;
-    type InitError = Err2;
-    type Future = Box<Future<Item = Self::Service, Error = Self::InitError>>;
-
-    fn new_service(&self) -> Self::Future {
-        let f = self.f.clone();
-        Box::new(
-            (self.state)()
-                .into_future()
-                .and_then(move |state| Ok(FnStateService::new(state, f))),
-        )
-    }
-}
-
-impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
-    IntoNewService<FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>> for (F1, F2)
-where
-    S: 'static,
-    F1: Fn(&mut S, Req) -> Fut1 + Clone + 'static,
-    F2: Fn() -> Fut2,
-    Fut1: IntoFuture<Item = Resp, Error = Err1> + 'static,
-    Fut2: IntoFuture<Item = S, Error = Err2> + 'static,
-    Req: 'static,
-    Resp: 'static,
-    Err1: 'static,
-    Err2: 'static,
-{
-    fn into_new_service(
-        self,
-    ) -> FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> {
-        FnStateNewService::new(self.0, self.1)
-    }
-}
-
-impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> Clone
-    for FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
-where
-    F1: Fn(&mut S, Req) -> Fut1 + Clone + 'static,
-    F2: Fn() -> Fut2 + Clone,
-    Fut1: IntoFuture<Item = Resp, Error = Err1>,
-    Fut2: IntoFuture<Item = S, Error = Err2>,
-{
-    fn clone(&self) -> Self {
-        Self::new(self.f.clone(), self.state.clone())
-    }
-}
-
-/// `AndThen` service combinator
-pub struct AndThen<A, B> {
-    a: A,
-    b: Rc<RefCell<B>>,
-}
-
-impl<A, B> AndThen<A, B>
-where
-    A: Service,
-    A::Error: Into<B::Error>,
-    B: Service<Request = A::Response>,
-{
-    /// Create new `AndThen` combinator
-    pub fn new(a: A, b: B) -> Self {
-        Self {
-            a,
-            b: Rc::new(RefCell::new(b)),
-        }
-    }
-}
-
-impl<A, B> Service for AndThen<A, B>
-where
-    A: Service,
-    A::Error: Into<B::Error>,
-    B: Service<Request = A::Response>,
-{
-    type Request = A::Request;
-    type Response = B::Response;
-    type Error = B::Error;
-    type Future = AndThenFuture<A, B>;
-
-    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-        match self.a.poll_ready() {
-            Ok(Async::Ready(_)) => self.b.borrow_mut().poll_ready(),
-            Ok(Async::NotReady) => Ok(Async::NotReady),
-            Err(err) => Err(err.into()),
-        }
-    }
-
-    fn call(&mut self, req: Self::Request) -> Self::Future {
-        AndThenFuture::new(self.a.call(req), self.b.clone())
-    }
-}
-
-pub struct AndThenFuture<A, B>
-where
-    A: Service,
-    A::Error: Into<B::Error>,
-    B: Service<Request = A::Response>,
-{
-    b: Rc<RefCell<B>>,
-    fut_b: Option<B::Future>,
-    fut_a: A::Future,
-}
-
-impl<A, B> AndThenFuture<A, B>
-where
-    A: Service,
-    A::Error: Into<B::Error>,
-    B: Service<Request = A::Response>,
-{
-    fn new(fut_a: A::Future, b: Rc<RefCell<B>>) -> Self {
-        AndThenFuture {
-            b,
-            fut_a,
-            fut_b: None,
-        }
-    }
-}
-
-impl<A, B> Future for AndThenFuture<A, B>
-where
-    A: Service,
-    A::Error: Into<B::Error>,
-    B: Service<Request = A::Response>,
-{
-    type Item = B::Response;
-    type Error = B::Error;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        if let Some(ref mut fut) = self.fut_b {
-            return fut.poll();
-        }
-
-        match self.fut_a.poll() {
-            Ok(Async::Ready(resp)) => {
-                self.fut_b = Some(self.b.borrow_mut().call(resp));
-                self.poll()
-            }
-            Ok(Async::NotReady) => Ok(Async::NotReady),
-            Err(err) => Err(err.into()),
-        }
-    }
-}
-
-/// `AndThenNewService` new service combinator
-pub struct AndThenNewService<A, B> {
-    a: A,
-    b: B,
-}
-
-impl<A, B> AndThenNewService<A, B>
-where
-    A: NewService,
-    B: NewService,
-{
-    /// Create new `AndThen` combinator
-    pub fn new<F: IntoNewService<B>>(a: A, f: F) -> Self {
-        Self {
-            a,
-            b: f.into_new_service(),
-        }
-    }
-}
-
-impl<A, B> NewService for AndThenNewService<A, B>
-where
-    A: NewService<Response = B::Request, InitError = B::InitError>,
-    A::Error: Into<B::Error>,
-    B: NewService,
-{
-    type Request = A::Request;
-    type Response = B::Response;
-    type Error = B::Error;
-    type Service = AndThen<A::Service, B::Service>;
-
-    type InitError = A::InitError;
-    type Future = AndThenNewServiceFuture<A, B>;
-
-    fn new_service(&self) -> Self::Future {
-        AndThenNewServiceFuture::new(self.a.new_service(), self.b.new_service())
-    }
-}
-
-impl<A, B> Clone for AndThenNewService<A, B>
-where
-    A: NewService<Response = B::Request, InitError = B::InitError> + Clone,
-    A::Error: Into<B::Error>,
-    B: NewService + Clone,
-{
-    fn clone(&self) -> Self {
-        Self {
-            a: self.a.clone(),
-            b: self.b.clone(),
-        }
-    }
-}
-
-pub struct AndThenNewServiceFuture<A, B>
-where
-    A: NewService,
-    B: NewService,
-{
-    fut_b: B::Future,
-    fut_a: A::Future,
-    a: Option<A::Service>,
-    b: Option<B::Service>,
-}
-
-impl<A, B> AndThenNewServiceFuture<A, B>
-where
-    A: NewService,
-    B: NewService,
-{
-    fn new(fut_a: A::Future, fut_b: B::Future) -> Self {
-        AndThenNewServiceFuture {
-            fut_a,
-            fut_b,
-            a: None,
-            b: None,
-        }
-    }
-}
-
-impl<A, B> Future for AndThenNewServiceFuture<A, B>
-where
-    A: NewService,
-    A::Error: Into<B::Error>,
-    B: NewService<Request = A::Response, InitError = A::InitError>,
-{
-    type Item = AndThen<A::Service, B::Service>;
-    type Error = B::InitError;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        if self.a.is_none() {
-            if let Async::Ready(service) = self.fut_a.poll()? {
-                self.a = Some(service);
-            }
-        }
-
-        if self.b.is_none() {
-            if let Async::Ready(service) = self.fut_b.poll()? {
-                self.b = Some(service);
-            }
-        }
-
-        if self.a.is_some() && self.b.is_some() {
-            Ok(Async::Ready(AndThen::new(
-                self.a.take().unwrap(),
-                self.b.take().unwrap(),
-            )))
-        } else {
-            Ok(Async::NotReady)
-        }
-    }
-}
-
-/// `MapErr` service combinator
-pub struct MapErr<A, F, E> {
-    a: A,
-    f: F,
-    e: marker::PhantomData<E>,
-}
-
-impl<A, F, E> MapErr<A, F, E>
-where
-    A: Service,
-    F: Fn(A::Error) -> E,
-{
-    /// Create new `MapErr` combinator
-    pub fn new(a: A, f: F) -> Self {
-        Self {
-            a,
-            f,
-            e: marker::PhantomData,
-        }
-    }
-}
-
-impl<A, F, E> Service for MapErr<A, F, E>
-where
-    A: Service,
-    F: Fn(A::Error) -> E,
-    F: Clone,
-{
-    type Request = A::Request;
-    type Response = A::Response;
-    type Error = E;
-    type Future = MapErrFuture<A, F, E>;
-
-    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-        self.a.poll_ready().map_err(&self.f)
-    }
-
-    fn call(&mut self, req: Self::Request) -> Self::Future {
-        MapErrFuture::new(self.a.call(req), self.f.clone())
-    }
-}
-
-pub struct MapErrFuture<A, F, E>
-where
-    A: Service,
-    F: Fn(A::Error) -> E,
-{
-    f: F,
-    fut: A::Future,
-}
-
-impl<A, F, E> MapErrFuture<A, F, E>
-where
-    A: Service,
-    F: Fn(A::Error) -> E,
-{
-    fn new(fut: A::Future, f: F) -> Self {
-        MapErrFuture { f, fut }
-    }
-}
-
-impl<A, F, E> Future for MapErrFuture<A, F, E>
-where
-    A: Service,
-    F: Fn(A::Error) -> E,
-{
-    type Item = A::Response;
-    type Error = E;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        self.fut.poll().map_err(&self.f)
-    }
-}
-
-/// `MapErrNewService` new service combinator
-pub struct MapErrNewService<A, F, E> {
-    a: A,
-    f: F,
-    e: marker::PhantomData<E>,
-}
-
-impl<A, F, E> MapErrNewService<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::Error) -> E,
-{
-    /// Create new `MapErr` new service instance
-    pub fn new(a: A, f: F) -> Self {
-        Self {
-            a,
-            f,
-            e: marker::PhantomData,
-        }
-    }
-}
-
-impl<A, F, E> Clone for MapErrNewService<A, F, E>
-where
-    A: NewService + Clone,
-    F: Fn(A::Error) -> E + Clone,
-{
-    fn clone(&self) -> Self {
-        Self {
-            a: self.a.clone(),
-            f: self.f.clone(),
-            e: marker::PhantomData,
-        }
-    }
-}
-
-impl<A, F, E> NewService for MapErrNewService<A, F, E>
-where
-    A: NewService + Clone,
-    F: Fn(A::Error) -> E + Clone,
-{
-    type Request = A::Request;
-    type Response = A::Response;
-    type Error = E;
-    type Service = MapErr<A::Service, F, E>;
-
-    type InitError = A::InitError;
-    type Future = MapErrNewServiceFuture<A, F, E>;
-
-    fn new_service(&self) -> Self::Future {
-        MapErrNewServiceFuture::new(self.a.new_service(), self.f.clone())
-    }
-}
-
-pub struct MapErrNewServiceFuture<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::Error) -> E,
-{
-    fut: A::Future,
-    f: F,
-}
-
-impl<A, F, E> MapErrNewServiceFuture<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::Error) -> E,
-{
-    fn new(fut: A::Future, f: F) -> Self {
-        MapErrNewServiceFuture { f, fut }
-    }
-}
-
-impl<A, F, E> Future for MapErrNewServiceFuture<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::Error) -> E + Clone,
-{
-    type Item = MapErr<A::Service, F, E>;
-    type Error = A::InitError;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        if let Async::Ready(service) = self.fut.poll()? {
-            Ok(Async::Ready(MapErr::new(service, self.f.clone())))
-        } else {
-            Ok(Async::NotReady)
-        }
-    }
-}
-
-/// `MapInitErr` service combinator
-pub struct MapInitErr<A, F, E> {
-    a: A,
-    f: F,
-    e: marker::PhantomData<E>,
-}
-
-impl<A, F, E> MapInitErr<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::InitError) -> E,
-{
-    /// Create new `MapInitErr` combinator
-    pub fn new(a: A, f: F) -> Self {
-        Self {
-            a,
-            f,
-            e: marker::PhantomData,
-        }
-    }
-}
-
-impl<A, F, E> Clone for MapInitErr<A, F, E>
-where
-    A: NewService + Clone,
-    F: Fn(A::InitError) -> E + Clone,
-{
-    fn clone(&self) -> Self {
-        Self {
-            a: self.a.clone(),
-            f: self.f.clone(),
-            e: marker::PhantomData,
-        }
-    }
-}
-
-impl<A, F, E> NewService for MapInitErr<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::InitError) -> E + Clone,
-{
-    type Request = A::Request;
-    type Response = A::Response;
-    type Error = A::Error;
-    type Service = A::Service;
-
-    type InitError = E;
-    type Future = MapInitErrFuture<A, F, E>;
-
-    fn new_service(&self) -> Self::Future {
-        MapInitErrFuture::new(self.a.new_service(), self.f.clone())
-    }
-}
-
-pub struct MapInitErrFuture<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::InitError) -> E,
-{
-    f: F,
-    fut: A::Future,
-}
-
-impl<A, F, E> MapInitErrFuture<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::InitError) -> E,
-{
-    fn new(fut: A::Future, f: F) -> Self {
-        MapInitErrFuture { f, fut }
-    }
-}
-
-impl<A, F, E> Future for MapInitErrFuture<A, F, E>
-where
-    A: NewService,
-    F: Fn(A::InitError) -> E,
-{
-    type Item = A::Service;
-    type Error = E;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        self.fut.poll().map_err(&self.f)
-    }
-}

src/service/and_then.rs

@@ -0,0 +1,215 @@
+use std::cell::RefCell;
+use std::rc::Rc;
+
+use futures::{Async, Future, Poll};
+use tower_service::{NewService, Service};
+
+use super::IntoNewService;
+
+/// `AndThen` service combinator
+pub struct AndThen<A, B> {
+    a: A,
+    b: Rc<RefCell<B>>,
+}
+
+impl<A, B> AndThen<A, B>
+where
+    A: Service,
+    A::Error: Into<B::Error>,
+    B: Service<Request = A::Response>,
+{
+    /// Create new `AndThen` combinator
+    pub fn new(a: A, b: B) -> Self {
+        Self {
+            a,
+            b: Rc::new(RefCell::new(b)),
+        }
+    }
+}
+
+impl<A, B> Service for AndThen<A, B>
+where
+    A: Service,
+    A::Error: Into<B::Error>,
+    B: Service<Request = A::Response>,
+{
+    type Request = A::Request;
+    type Response = B::Response;
+    type Error = B::Error;
+    type Future = AndThenFuture<A, B>;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        match self.a.poll_ready() {
+            Ok(Async::Ready(_)) => self.b.borrow_mut().poll_ready(),
+            Ok(Async::NotReady) => Ok(Async::NotReady),
+            Err(err) => Err(err.into()),
+        }
+    }
+
+    fn call(&mut self, req: Self::Request) -> Self::Future {
+        AndThenFuture::new(self.a.call(req), self.b.clone())
+    }
+}
+
+pub struct AndThenFuture<A, B>
+where
+    A: Service,
+    A::Error: Into<B::Error>,
+    B: Service<Request = A::Response>,
+{
+    b: Rc<RefCell<B>>,
+    fut_b: Option<B::Future>,
+    fut_a: A::Future,
+}
+
+impl<A, B> AndThenFuture<A, B>
+where
+    A: Service,
+    A::Error: Into<B::Error>,
+    B: Service<Request = A::Response>,
+{
+    fn new(fut_a: A::Future, b: Rc<RefCell<B>>) -> Self {
+        AndThenFuture {
+            b,
+            fut_a,
+            fut_b: None,
+        }
+    }
+}
+
+impl<A, B> Future for AndThenFuture<A, B>
+where
+    A: Service,
+    A::Error: Into<B::Error>,
+    B: Service<Request = A::Response>,
+{
+    type Item = B::Response;
+    type Error = B::Error;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        if let Some(ref mut fut) = self.fut_b {
+            return fut.poll();
+        }
+
+        match self.fut_a.poll() {
+            Ok(Async::Ready(resp)) => {
+                self.fut_b = Some(self.b.borrow_mut().call(resp));
+                self.poll()
+            }
+            Ok(Async::NotReady) => Ok(Async::NotReady),
+            Err(err) => Err(err.into()),
+        }
+    }
+}
+
+/// `AndThenNewService` new service combinator
+pub struct AndThenNewService<A, B> {
+    a: A,
+    b: B,
+}
+
+impl<A, B> AndThenNewService<A, B>
+where
+    A: NewService,
+    B: NewService,
+{
+    /// Create new `AndThen` combinator
+    pub fn new<F: IntoNewService<B>>(a: A, f: F) -> Self {
+        Self {
+            a,
+            b: f.into_new_service(),
+        }
+    }
+}
+
+impl<A, B> NewService for AndThenNewService<A, B>
+where
+    A: NewService<Response = B::Request, InitError = B::InitError>,
+    A::Error: Into<B::Error>,
+    B: NewService,
+{
+    type Request = A::Request;
+    type Response = B::Response;
+    type Error = B::Error;
+    type Service = AndThen<A::Service, B::Service>;
+
+    type InitError = A::InitError;
+    type Future = AndThenNewServiceFuture<A, B>;
+
+    fn new_service(&self) -> Self::Future {
+        AndThenNewServiceFuture::new(self.a.new_service(), self.b.new_service())
+    }
+}
+
+impl<A, B> Clone for AndThenNewService<A, B>
+where
+    A: NewService<Response = B::Request, InitError = B::InitError> + Clone,
+    A::Error: Into<B::Error>,
+    B: NewService + Clone,
+{
+    fn clone(&self) -> Self {
+        Self {
+            a: self.a.clone(),
+            b: self.b.clone(),
+        }
+    }
+}
+
+pub struct AndThenNewServiceFuture<A, B>
+where
+    A: NewService,
+    B: NewService,
+{
+    fut_b: B::Future,
+    fut_a: A::Future,
+    a: Option<A::Service>,
+    b: Option<B::Service>,
+}
+
+impl<A, B> AndThenNewServiceFuture<A, B>
+where
+    A: NewService,
+    B: NewService,
+{
+    fn new(fut_a: A::Future, fut_b: B::Future) -> Self {
+        AndThenNewServiceFuture {
+            fut_a,
+            fut_b,
+            a: None,
+            b: None,
+        }
+    }
+}
+
+impl<A, B> Future for AndThenNewServiceFuture<A, B>
+where
+    A: NewService,
+    A::Error: Into<B::Error>,
+    B: NewService<Request = A::Response, InitError = A::InitError>,
+{
+    type Item = AndThen<A::Service, B::Service>;
+    type Error = B::InitError;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        if self.a.is_none() {
+            if let Async::Ready(service) = self.fut_a.poll()? {
+                self.a = Some(service);
+            }
+        }
+
+        if self.b.is_none() {
+            if let Async::Ready(service) = self.fut_b.poll()? {
+                self.b = Some(service);
+            }
+        }
+
+        if self.a.is_some() && self.b.is_some() {
+            Ok(Async::Ready(AndThen::new(
+                self.a.take().unwrap(),
+                self.b.take().unwrap(),
+            )))
+        } else {
+            Ok(Async::NotReady)
+        }
+    }
+}

src/service/fn_service.rs

@@ -0,0 +1,120 @@
+use std::marker;
+
+use futures::{
+    future::{ok, FutureResult},
+    Async, IntoFuture, Poll,
+};
+use tower_service::{NewService, Service};
+
+use super::IntoNewService;
+
+pub struct FnService<F, Req, Resp, E, Fut>
+where
+    F: Fn(Req) -> Fut,
+    Fut: IntoFuture<Item = Resp, Error = E>,
+{
+    f: F,
+    req: marker::PhantomData<Req>,
+    resp: marker::PhantomData<Resp>,
+    err: marker::PhantomData<E>,
+}
+
+impl<F, Req, Resp, E, Fut> FnService<F, Req, Resp, E, Fut>
+where
+    F: Fn(Req) -> Fut,
+    Fut: IntoFuture<Item = Resp, Error = E>,
+{
+    pub fn new(f: F) -> Self {
+        FnService {
+            f,
+            req: marker::PhantomData,
+            resp: marker::PhantomData,
+            err: marker::PhantomData,
+        }
+    }
+}
+
+impl<F, Req, Resp, E, Fut> Service for FnService<F, Req, Resp, E, Fut>
+where
+    F: Fn(Req) -> Fut,
+    Fut: IntoFuture<Item = Resp, Error = E>,
+{
+    type Request = Req;
+    type Response = Resp;
+    type Error = E;
+    type Future = Fut::Future;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        Ok(Async::Ready(()))
+    }
+
+    fn call(&mut self, req: Req) -> Self::Future {
+        (self.f)(req).into_future()
+    }
+}
+
+pub struct FnNewService<F, Req, Resp, Err, IErr, Fut>
+where
+    F: Fn(Req) -> Fut,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    f: F,
+    req: marker::PhantomData<Req>,
+    resp: marker::PhantomData<Resp>,
+    err: marker::PhantomData<Err>,
+    ierr: marker::PhantomData<IErr>,
+}
+
+impl<F, Req, Resp, Err, IErr, Fut> FnNewService<F, Req, Resp, Err, IErr, Fut>
+where
+    F: Fn(Req) -> Fut + Clone,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    fn new(f: F) -> Self {
+        FnNewService {
+            f,
+            req: marker::PhantomData,
+            resp: marker::PhantomData,
+            err: marker::PhantomData,
+            ierr: marker::PhantomData,
+        }
+    }
+}
+
+impl<F, Req, Resp, Err, IErr, Fut> NewService for FnNewService<F, Req, Resp, Err, IErr, Fut>
+where
+    F: Fn(Req) -> Fut + Clone,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    type Request = Req;
+    type Response = Resp;
+    type Error = Err;
+    type Service = FnService<F, Req, Resp, Err, Fut>;
+    type InitError = IErr;
+    type Future = FutureResult<Self::Service, Self::InitError>;
+
+    fn new_service(&self) -> Self::Future {
+        ok(FnService::new(self.f.clone()))
+    }
+}
+
+impl<F, Req, Resp, Err, IErr, Fut> IntoNewService<FnNewService<F, Req, Resp, Err, IErr, Fut>>
+    for F
+where
+    F: Fn(Req) -> Fut + Clone + 'static,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    fn into_new_service(self) -> FnNewService<F, Req, Resp, Err, IErr, Fut> {
+        FnNewService::new(self)
+    }
+}
+
+impl<F, Req, Resp, Err, IErr, Fut> Clone for FnNewService<F, Req, Resp, Err, IErr, Fut>
+where
+    F: Fn(Req) -> Fut + Clone,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    fn clone(&self) -> Self {
+        Self::new(self.f.clone())
+    }
+}

src/service/fn_state_service.rs

@@ -0,0 +1,147 @@
+use std::marker;
+
+use futures::{Async, Future, IntoFuture, Poll};
+use tower_service::{NewService, Service};
+
+use super::IntoNewService;
+
+pub struct FnStateService<S, F, Req, Resp, Err, Fut>
+where
+    F: Fn(&mut S, Req) -> Fut,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    f: F,
+    state: S,
+    req: marker::PhantomData<Req>,
+    resp: marker::PhantomData<Resp>,
+    err: marker::PhantomData<Err>,
+}
+
+impl<S, F, Req, Resp, Err, Fut> FnStateService<S, F, Req, Resp, Err, Fut>
+where
+    F: Fn(&mut S, Req) -> Fut,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    pub fn new(state: S, f: F) -> Self {
+        FnStateService {
+            f,
+            state,
+            req: marker::PhantomData,
+            resp: marker::PhantomData,
+            err: marker::PhantomData,
+        }
+    }
+}
+
+impl<S, F, Req, Resp, Err, Fut> Service for FnStateService<S, F, Req, Resp, Err, Fut>
+where
+    F: Fn(&mut S, Req) -> Fut,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    type Request = Req;
+    type Response = Resp;
+    type Error = Err;
+    type Future = Fut::Future;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        Ok(Async::Ready(()))
+    }
+
+    fn call(&mut self, req: Req) -> Self::Future {
+        (self.f)(&mut self.state, req).into_future()
+    }
+}
+
+/// `NewService` for state and handler functions
+pub struct FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> {
+    f: F1,
+    state: F2,
+    s: marker::PhantomData<S>,
+    req: marker::PhantomData<Req>,
+    resp: marker::PhantomData<Resp>,
+    err1: marker::PhantomData<Err1>,
+    err2: marker::PhantomData<Err2>,
+    fut1: marker::PhantomData<Fut1>,
+    fut2: marker::PhantomData<Fut2>,
+}
+
+impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
+    FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
+{
+    fn new(f: F1, state: F2) -> Self {
+        FnStateNewService {
+            f,
+            state,
+            s: marker::PhantomData,
+            req: marker::PhantomData,
+            resp: marker::PhantomData,
+            err1: marker::PhantomData,
+            err2: marker::PhantomData,
+            fut1: marker::PhantomData,
+            fut2: marker::PhantomData,
+        }
+    }
+}
+
+impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> NewService
+    for FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
+where
+    S: 'static,
+    F1: Fn(&mut S, Req) -> Fut1 + Clone + 'static,
+    F2: Fn() -> Fut2,
+    Fut1: IntoFuture<Item = Resp, Error = Err1> + 'static,
+    Fut2: IntoFuture<Item = S, Error = Err2> + 'static,
+    Req: 'static,
+    Resp: 'static,
+    Err1: 'static,
+    Err2: 'static,
+{
+    type Request = Req;
+    type Response = Resp;
+    type Error = Err1;
+    type Service = FnStateService<S, F1, Req, Resp, Err1, Fut1>;
+    type InitError = Err2;
+    type Future = Box<Future<Item = Self::Service, Error = Self::InitError>>;
+
+    fn new_service(&self) -> Self::Future {
+        let f = self.f.clone();
+        Box::new(
+            (self.state)()
+                .into_future()
+                .and_then(move |state| Ok(FnStateService::new(state, f))),
+        )
+    }
+}
+
+impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
+    IntoNewService<FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>> for (F1, F2)
+where
+    S: 'static,
+    F1: Fn(&mut S, Req) -> Fut1 + Clone + 'static,
+    F2: Fn() -> Fut2,
+    Fut1: IntoFuture<Item = Resp, Error = Err1> + 'static,
+    Fut2: IntoFuture<Item = S, Error = Err2> + 'static,
+    Req: 'static,
+    Resp: 'static,
+    Err1: 'static,
+    Err2: 'static,
+{
+    fn into_new_service(
+        self,
+    ) -> FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> {
+        FnStateNewService::new(self.0, self.1)
+    }
+}
+
+impl<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2> Clone
+    for FnStateNewService<S, F1, F2, Req, Resp, Err1, Err2, Fut1, Fut2>
+where
+    F1: Fn(&mut S, Req) -> Fut1 + Clone + 'static,
+    F2: Fn() -> Fut2 + Clone,
+    Fut1: IntoFuture<Item = Resp, Error = Err1>,
+    Fut2: IntoFuture<Item = S, Error = Err2>,
+{
+    fn clone(&self) -> Self {
+        Self::new(self.f.clone(), self.state.clone())
+    }
+}

src/service/map_err.rs

@@ -0,0 +1,168 @@
+use std::marker;
+
+use futures::{Async, Future, Poll};
+use tower_service::{NewService, Service};
+
+/// `MapErr` service combinator
+pub struct MapErr<A, F, E> {
+    a: A,
+    f: F,
+    e: marker::PhantomData<E>,
+}
+
+impl<A, F, E> MapErr<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    /// Create new `MapErr` combinator
+    pub fn new(a: A, f: F) -> Self {
+        Self {
+            a,
+            f,
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> Service for MapErr<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+    F: Clone,
+{
+    type Request = A::Request;
+    type Response = A::Response;
+    type Error = E;
+    type Future = MapErrFuture<A, F, E>;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        self.a.poll_ready().map_err(&self.f)
+    }
+
+    fn call(&mut self, req: Self::Request) -> Self::Future {
+        MapErrFuture::new(self.a.call(req), self.f.clone())
+    }
+}
+
+pub struct MapErrFuture<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    f: F,
+    fut: A::Future,
+}
+
+impl<A, F, E> MapErrFuture<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    fn new(fut: A::Future, f: F) -> Self {
+        MapErrFuture { f, fut }
+    }
+}
+
+impl<A, F, E> Future for MapErrFuture<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    type Item = A::Response;
+    type Error = E;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        self.fut.poll().map_err(&self.f)
+    }
+}
+
+/// `MapErrNewService` new service combinator
+pub struct MapErrNewService<A, F, E> {
+    a: A,
+    f: F,
+    e: marker::PhantomData<E>,
+}
+
+impl<A, F, E> MapErrNewService<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E,
+{
+    /// Create new `MapErr` new service instance
+    pub fn new(a: A, f: F) -> Self {
+        Self {
+            a,
+            f,
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> Clone for MapErrNewService<A, F, E>
+where
+    A: NewService + Clone,
+    F: Fn(A::Error) -> E + Clone,
+{
+    fn clone(&self) -> Self {
+        Self {
+            a: self.a.clone(),
+            f: self.f.clone(),
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> NewService for MapErrNewService<A, F, E>
+where
+    A: NewService + Clone,
+    F: Fn(A::Error) -> E + Clone,
+{
+    type Request = A::Request;
+    type Response = A::Response;
+    type Error = E;
+    type Service = MapErr<A::Service, F, E>;
+
+    type InitError = A::InitError;
+    type Future = MapErrNewServiceFuture<A, F, E>;
+
+    fn new_service(&self) -> Self::Future {
+        MapErrNewServiceFuture::new(self.a.new_service(), self.f.clone())
+    }
+}
+
+pub struct MapErrNewServiceFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E,
+{
+    fut: A::Future,
+    f: F,
+}
+
+impl<A, F, E> MapErrNewServiceFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E,
+{
+    fn new(fut: A::Future, f: F) -> Self {
+        MapErrNewServiceFuture { f, fut }
+    }
+}
+
+impl<A, F, E> Future for MapErrNewServiceFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E + Clone,
+{
+    type Item = MapErr<A::Service, F, E>;
+    type Error = A::InitError;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        if let Async::Ready(service) = self.fut.poll()? {
+            Ok(Async::Ready(MapErr::new(service, self.f.clone())))
+        } else {
+            Ok(Async::NotReady)
+        }
+    }
+}

src/service/map_init_err.rs

@@ -0,0 +1,90 @@
+use std::marker;
+
+use futures::{Future, Poll};
+use tower_service::NewService;
+
+/// `MapInitErr` service combinator
+pub struct MapInitErr<A, F, E> {
+    a: A,
+    f: F,
+    e: marker::PhantomData<E>,
+}
+
+impl<A, F, E> MapInitErr<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::InitError) -> E,
+{
+    /// Create new `MapInitErr` combinator
+    pub fn new(a: A, f: F) -> Self {
+        Self {
+            a,
+            f,
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> Clone for MapInitErr<A, F, E>
+where
+    A: NewService + Clone,
+    F: Fn(A::InitError) -> E + Clone,
+{
+    fn clone(&self) -> Self {
+        Self {
+            a: self.a.clone(),
+            f: self.f.clone(),
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> NewService for MapInitErr<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::InitError) -> E + Clone,
+{
+    type Request = A::Request;
+    type Response = A::Response;
+    type Error = A::Error;
+    type Service = A::Service;
+
+    type InitError = E;
+    type Future = MapInitErrFuture<A, F, E>;
+
+    fn new_service(&self) -> Self::Future {
+        MapInitErrFuture::new(self.a.new_service(), self.f.clone())
+    }
+}
+
+pub struct MapInitErrFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::InitError) -> E,
+{
+    f: F,
+    fut: A::Future,
+}
+
+impl<A, F, E> MapInitErrFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::InitError) -> E,
+{
+    fn new(fut: A::Future, f: F) -> Self {
+        MapInitErrFuture { f, fut }
+    }
+}
+
+impl<A, F, E> Future for MapInitErrFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::InitError) -> E,
+{
+    type Item = A::Service;
+    type Error = E;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        self.fut.poll().map_err(&self.f)
+    }
+}

src/service/mod.rs

@@ -0,0 +1,93 @@
+use futures::IntoFuture;
+use tower_service::{NewService, Service};
+
+mod and_then;
+mod fn_service;
+mod fn_state_service;
+mod map_err;
+mod map_init_err;
+
+pub use self::and_then::{AndThen, AndThenNewService};
+pub use self::fn_service::FnService;
+pub use self::fn_state_service::FnStateService;
+pub use self::map_err::{MapErr, MapErrNewService};
+pub use self::map_init_err::MapInitErr;
+
+pub trait NewServiceExt: NewService {
+    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_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: NewService> NewServiceExt for T {}
+
+/// Trait for types that can be converted to a Service
+pub trait IntoService<T>
+where
+    T: Service,
+{
+    /// Create service
+    fn into(self) -> T;
+}
+
+/// Trait for types that can be converted to a Service
+pub trait IntoNewService<T>
+where
+    T: NewService,
+{
+    /// Create service
+    fn into_new_service(self) -> T;
+}
+
+impl<T> IntoService<T> for T
+where
+    T: Service,
+{
+    fn into(self) -> T {
+        self
+    }
+}
+
+impl<T> IntoNewService<T> for T
+where
+    T: NewService,
+{
+    fn into_new_service(self) -> T {
+        self
+    }
+}
+
+impl<F, Req, Resp, Err, Fut> IntoService<FnService<F, Req, Resp, Err, Fut>> for F
+where
+    F: Fn(Req) -> Fut + 'static,
+    Fut: IntoFuture<Item = Resp, Error = Err>,
+{
+    fn into(self) -> FnService<F, Req, Resp, Err, Fut> {
+        FnService::new(self)
+    }
+}

src/ssl/mod.rs

@@ -2,7 +2,7 @@
 #[cfg(feature = "ssl")]
 mod openssl;
 #[cfg(feature = "ssl")]
-pub use self::openssl::OpensslService;
+pub use self::openssl::{OpensslAcceptor, OpensslConnector};
 
 // #[cfg(feature = "tls")]
 // mod nativetls;

src/ssl/openssl.rs

@@ -1,26 +1,25 @@
-use std::marker::PhantomData;
-// use std::net::Shutdown;
 use std::io;
+use std::marker::PhantomData;
 
-use futures::{future, future::FutureResult, Async, Future, Poll};
+use futures::{future, future::FutureResult, Async, Poll};
-use openssl::ssl::{AlpnError, SslAcceptor, SslAcceptorBuilder};
+use openssl::ssl::{AlpnError, Error, SslAcceptor, SslAcceptorBuilder, SslConnector};
 use tokio_io::{AsyncRead, AsyncWrite};
-use tokio_openssl::{AcceptAsync, SslAcceptorExt, SslStream};
+use tokio_openssl::{AcceptAsync, ConnectAsync, SslAcceptorExt, SslConnectorExt, SslStream};
 
 use {NewService, Service};
 
 /// Support `SSL` connections via openssl package
 ///
-/// `alpn` feature enables `OpensslAcceptor` type
+/// `ssl` feature enables `OpensslAcceptor` type
-pub struct OpensslService<T> {
+pub struct OpensslAcceptor<T> {
     acceptor: SslAcceptor,
     io: PhantomData<T>,
 }
 
-impl<T> OpensslService<T> {
+impl<T> OpensslAcceptor<T> {
-    /// Create default `OpensslService`
+    /// Create default `OpensslAcceptor`
     pub fn new(builder: SslAcceptorBuilder) -> Self {
-        OpensslService {
+        OpensslAcceptor {
             acceptor: builder.build(),
             io: PhantomData,
         }
@@ -40,13 +39,13 @@ impl<T> OpensslService<T> {
         });
         builder.set_alpn_protos(&protos[..])?;
 
-        Ok(OpensslService {
+        Ok(OpensslAcceptor {
             acceptor: builder.build(),
             io: PhantomData,
         })
     }
 }
-impl<T: AsyncRead + AsyncWrite> Clone for OpensslService<T> {
+impl<T: AsyncRead + AsyncWrite> Clone for OpensslAcceptor<T> {
     fn clone(&self) -> Self {
         Self {
             acceptor: self.acceptor.clone(),
@@ -55,69 +54,102 @@ impl<T: AsyncRead + AsyncWrite> Clone for OpensslService<T> {
     }
 }
 
-impl<T: AsyncRead + AsyncWrite> NewService for OpensslService<T> {
+impl<T: AsyncRead + AsyncWrite> NewService for OpensslAcceptor<T> {
     type Request = T;
     type Response = SslStream<T>;
-    type Error = io::Error;
+    type Error = Error;
-    type Service = OpensslAcceptor<T>;
+    type Service = OpensslAcceptorService<T>;
     type InitError = io::Error;
     type Future = FutureResult<Self::Service, io::Error>;
 
     fn new_service(&self) -> Self::Future {
-        future::ok(OpensslAcceptor {
+        future::ok(OpensslAcceptorService {
             acceptor: self.acceptor.clone(),
             io: PhantomData,
         })
     }
 }
 
-pub struct OpensslAcceptor<T> {
+pub struct OpensslAcceptorService<T> {
     acceptor: SslAcceptor,
     io: PhantomData<T>,
 }
 
-impl<T: AsyncRead + AsyncWrite> Service for OpensslAcceptor<T> {
+impl<T: AsyncRead + AsyncWrite> Service for OpensslAcceptorService<T> {
     type Request = T;
     type Response = SslStream<T>;
-    type Error = io::Error;
+    type Error = Error;
-    type Future = AcceptorFuture<T>;
+    type Future = AcceptAsync<T>;
 
     fn poll_ready(&mut self) -> Poll<(), Self::Error> {
         Ok(Async::Ready(()))
     }
 
     fn call(&mut self, req: Self::Request) -> Self::Future {
-        AcceptorFuture(SslAcceptorExt::accept_async(&self.acceptor, req))
+        SslAcceptorExt::accept_async(&self.acceptor, req)
     }
 }
 
-pub struct AcceptorFuture<T>(AcceptAsync<T>);
+/// Openssl connector factory
+pub struct OpensslConnector<T> {
+    connector: SslConnector,
+    io: PhantomData<T>,
+}
 
-impl<T: AsyncRead + AsyncWrite> Future for AcceptorFuture<T> {
+impl<T> OpensslConnector<T> {
-    type Item = SslStream<T>;
+    pub fn new(connector: SslConnector) -> Self {
-    type Error = io::Error;
+        OpensslConnector {
-
+            connector,
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+            io: PhantomData,
-        self.0
+        }
-            .poll()
-            .map_err(|e| io::Error::new(io::ErrorKind::Other, e))
     }
 }
 
-// impl<T: IoStream> IoStream for SslStream<T> {
+impl<T> Clone for OpensslConnector<T> {
-//     #[inline]
+    fn clone(&self) -> Self {
-//     fn shutdown(&mut self, _how: Shutdown) -> io::Result<()> {
+        Self {
-//         let _ = self.get_mut().shutdown();
+            connector: self.connector.clone(),
-//         Ok(())
+            io: PhantomData,
-//     }
+        }
+    }
+}
 
-//     #[inline]
+impl<T: AsyncRead + AsyncWrite> NewService for OpensslConnector<T> {
-//     fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()> {
+    type Request = T;
-//         self.get_mut().get_mut().set_nodelay(nodelay)
+    type Response = SslStream<T>;
-//     }
+    type Error = Error;
+    type Service = OpensslConnectorService<T>;
+    type InitError = io::Error;
+    type Future = FutureResult<Self::Service, Self::InitError>;
 
-//     #[inline]
+    fn new_service(&self) -> Self::Future {
-//     fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
+        future::ok(OpensslConnectorService {
-//         self.get_mut().get_mut().set_linger(dur)
+            connector: self.connector.clone(),
-//     }
+            io: PhantomData,
-// }
+        })
+    }
+}
+
+pub trait OpensslDomain {
+    fn domain(&self) -> &str;
+}
+
+pub struct OpensslConnectorService<T> {
+    connector: SslConnector,
+    io: PhantomData<T>,
+}
+
+impl<T: AsyncRead + AsyncWrite> Service for OpensslConnectorService<T> {
+    type Request = T;
+    type Response = SslStream<T>;
+    type Error = Error;
+    type Future = ConnectAsync<T>;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        Ok(Async::Ready(()))
+    }
+
+    fn call(&mut self, req: Self::Request) -> Self::Future {
+        SslConnectorExt::connect_async(&self.connector, "", req)
+    }
+}