arc-reactor 0.2.4

use core::{Request, Response};
use hyper::rt::Future;
use proto::MiddleWare;

pub type FutureResponse = Box<Future<Item = Response, Error = Response> + Send>;

/// This trait is automatically derived by the #[service] proc_macro.
pub trait ArcService: ArcServiceClone + Send + Sync {
	fn call(&self, req: Request, res: Response) -> FutureResponse;
}

#[cfg(not(feature = "unstable"))]
impl<T> ArcService for T
where
	T: Fn(Request, Response) -> FutureResponse + Send + Sync + Clone + 'static,
{
	fn call(&self, req: Request, res: Response) -> FutureResponse {
		(self)(req, res)
	}
}

pub trait ArcServiceClone {
	fn clone_service(&self) -> Box<ArcService>;
}

impl<T> ArcServiceClone for T
where
	T: 'static + ArcService + Clone,
{
	fn clone_service(&self) -> Box<ArcService> {
		Box::new(self.clone())
	}
}

impl Clone for Box<ArcService> {
	fn clone(&self) -> Self {
		self.clone_service()
	}
}

#[derive(Clone)]
pub struct ArcHandler {
	pub before: Option<Box<MiddleWare<Request>>>,
	pub handler: Option<Box<ArcService>>,
	pub after: Option<Box<MiddleWare<Response>>>,
}

impl ArcHandler {
	pub fn new<T: 'static + ArcService>(h: T) -> Self {
		Self {
			before: None,
			handler: Some(Box::new(h)),
			after: None,
		}
	}

	pub fn before<T: 'static + MiddleWare<Request>>(&mut self, before: T) {
		self.before = Some(Box::new(before));
	}

	pub fn after<T: 'static + MiddleWare<Response>>(&mut self, after: T) {
		self.after = Some(Box::new(after));
	}
}

impl ArcService for ArcHandler {
	fn call(&self, req: Request, res: Response) -> FutureResponse {
		if self.before.is_some() && self.after.is_none() {
			let before = match self.before {
				Some(ref before) => before.clone(),
				_ => unreachable!(),
			};

			let handler = self.handler.clone().unwrap();
			let responsefuture = before.call(req).and_then(move |req| handler.call(req, res));
			return Box::new(responsefuture);
		}

		if self.before.is_none() && self.after.is_some() {
			let after = match self.after {
				Some(ref after) => after.clone(),
				_ => unreachable!(),
			};
			let handler = self.handler.clone().unwrap();
			let responsefuture = handler.call(req, res).then(move |res| {
				match res {
					Ok(res) | Err(res) => after.call(res),
				}
			});
			return Box::new(responsefuture);
		}

		if self.before.is_some() && self.after.is_some() {
			let before = match self.before {
				Some(ref before) => before.clone(),
				_ => unreachable!(),
			};

			let handler = self.handler.clone().unwrap();
			let after = match self.after {
				Some(ref after) => after.clone(),
				_ => unreachable!(),
			};

			let responsefuture = before
				.call(req)
				.and_then(move |req| handler.call(req, res))
				.then(move |res| {
					match res {
						Ok(res) | Err(res) => after.call(res),
					}
				});
			return Box::new(responsefuture);
		}

		return self
			.handler
			.clone()
			.expect("No service Supplied")
			.call(req, res);
	}
}