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//! Controllers are responsible for handling requests and returning responses to //! the client. //! //! More specifically a Controller defines a list of endpoint (Handlers) that //! handle a request and return a Future of a //! [`Responder`](../responder/trait.Responder.html). The [`Responder`](../ //! responder/trait.Responder.html) is responsible for the [`Response`](../ //! response/struct.Response.html) being generated //! //! To create a controller, simply implement the //! [Controller](trait.Controller.html) trait on a struct: //! ```rust //! use saphir::prelude::*; //! //! struct BasicController; //! //! impl Controller for BasicController { //! const BASE_PATH: &'static str = "/basic"; //! //! fn handlers(&self) -> Vec<ControllerEndpoint<Self>> //! where //! Self: Sized { //! EndpointsBuilder::new() //! .add(Method::GET, "/healthz", BasicController::healthz) //! .build() //! } //! } //! //! impl BasicController { //! async fn healthz(&self, req: Request<Body>) -> impl Responder {200} //! } //! ``` use crate::{ body::Body, guard::{Builder as GuardBuilder, GuardChain, GuardChainEnd}, request::Request, responder::{DynResponder, Responder}, }; use futures::future::BoxFuture; use futures_util::future::{Future, FutureExt}; use http::Method; /// Type definition to represent a endpoint within a controller pub type ControllerEndpoint<C> = ( Option<&'static str>, Method, &'static str, Box<dyn DynControllerHandler<C, Body> + Send + Sync>, Box<dyn GuardChain>, ); /// Trait that defines how a controller handles its requests pub trait Controller { /// Defines the base path from which requests are to be handled by this /// controller const BASE_PATH: &'static str; /// Returns a list of [`ControllerEndpoint`](type.ControllerEndpoint.html) /// /// Each [`ControllerEndpoint`](type.ControllerEndpoint.html) is then added /// to the router, which will dispatch requests accordingly fn handlers(&self) -> Vec<ControllerEndpoint<Self>> where Self: Sized; } /// Trait that defines a handler within a controller. /// This trait is not meant to be implemented manually as there is a blanket /// implementation for Async Fns pub trait ControllerHandler<C, B> { /// An instance of a [`Responder`](../responder/trait.Responder.html) being /// returned by the handler type Responder: Responder; /// type Future: Future<Output = Self::Responder>; /// Handle the request dispatched from the /// [`Router`](../router/struct.Router.html) fn handle(&self, controller: &'static C, req: Request<B>) -> Self::Future; } /// pub trait DynControllerHandler<C, B> { /// fn dyn_handle(&self, controller: &'static C, req: Request<B>) -> BoxFuture<'static, Box<dyn DynResponder + Send>>; } /// Builder to simplify returning a list of endpoint in the `handlers` method of /// the controller trait #[derive(Default)] pub struct EndpointsBuilder<C: Controller> { handlers: Vec<ControllerEndpoint<C>>, } impl<C: Controller> EndpointsBuilder<C> { /// Create a new endpoint builder #[inline] pub fn new() -> Self { Self { handlers: Default::default() } } /// Add a endpoint the the builder /// /// ```rust /// # use saphir::prelude::*; /// /// # struct BasicController; /// /// # impl Controller for BasicController { /// # const BASE_PATH: &'static str = "/basic"; /// # /// # fn handlers(&self) -> Vec<ControllerEndpoint<Self>> /// # where /// # Self: Sized { /// # EndpointsBuilder::new() /// # .add(Method::GET, "/healthz", BasicController::healthz) /// # .build() /// # } /// # } /// # /// impl BasicController { /// async fn healthz(&self, req: Request<Body>) -> impl Responder {200} /// } /// /// let b: EndpointsBuilder<BasicController> = EndpointsBuilder::new().add(Method::GET, "/healthz", BasicController::healthz); /// ``` #[inline] pub fn add<H>(mut self, method: Method, route: &'static str, handler: H) -> Self where H: 'static + DynControllerHandler<C, Body> + Send + Sync, { self.handlers.push((None, method, route, Box::new(handler), GuardBuilder::default().build())); self } /// Add a guarded endpoint the the builder #[inline] pub fn add_with_guards<H, F, Chain>(mut self, method: Method, route: &'static str, handler: H, guards: F) -> Self where H: 'static + DynControllerHandler<C, Body> + Send + Sync, F: FnOnce(GuardBuilder<GuardChainEnd>) -> GuardBuilder<Chain>, Chain: GuardChain + 'static, { self.handlers .push((None, method, route, Box::new(handler), guards(GuardBuilder::default()).build())); self } /// Add but with a handler name #[inline] pub fn add_with_name<H>(mut self, handler_name: &'static str, method: Method, route: &'static str, handler: H) -> Self where H: 'static + DynControllerHandler<C, Body> + Send + Sync, { self.handlers .push((Some(handler_name), method, route, Box::new(handler), GuardBuilder::default().build())); self } /// Add with guard but with a handler name #[inline] pub fn add_with_guards_and_name<H, F, Chain>(mut self, handler_name: &'static str, method: Method, route: &'static str, handler: H, guards: F) -> Self where H: 'static + DynControllerHandler<C, Body> + Send + Sync, F: FnOnce(GuardBuilder<GuardChainEnd>) -> GuardBuilder<Chain>, Chain: GuardChain + 'static, { self.handlers .push((Some(handler_name), method, route, Box::new(handler), guards(GuardBuilder::default()).build())); self } /// Finish the builder into a `Vec<ControllerEndpoint<C>>` #[inline] pub fn build(self) -> Vec<ControllerEndpoint<C>> { self.handlers } } impl<C, B, Fun, Fut, R> ControllerHandler<C, B> for Fun where C: 'static, Fun: Fn(&'static C, Request<B>) -> Fut, Fut: 'static + Future<Output = R> + Send, R: Responder, { type Future = Box<dyn Future<Output = Self::Responder> + Unpin + Send>; type Responder = R; #[inline] fn handle(&self, controller: &'static C, req: Request<B>) -> Self::Future { Box::new(Box::pin((*self)(controller, req))) } } impl<C, T, H, Fut, R> DynControllerHandler<C, T> for H where R: 'static + Responder + Send, Fut: 'static + Future<Output = R> + Unpin + Send, H: ControllerHandler<C, T, Future = Fut, Responder = R>, { #[inline] fn dyn_handle(&self, controller: &'static C, req: Request<T>) -> BoxFuture<'static, Box<dyn DynResponder + Send>> { self.handle(controller, req).map(|r| Box::new(Some(r)) as Box<dyn DynResponder + Send>).boxed() } }