a3s-boot 0.1.3

Adapter-first modular Rust web framework for A3S inspired by Nest.js
Documentation 
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use super::route::RouteDefinition;
use crate::{BootError, BootRequest, BootResponse, BoxFuture, ModuleRef, Result};
use std::future::Future;
use std::marker::PhantomData;
use std::sync::Arc;

/// Type-erased route handler used by adapters.
pub trait RouteHandler: Send + Sync + 'static {
    fn call(&self, request: BootRequest) -> BoxFuture<'static, Result<BootResponse>>;
}

impl<F, Fut> RouteHandler for F
where
    F: Fn(BootRequest) -> Fut + Send + Sync + 'static,
    Fut: Future<Output = Result<BootResponse>> + Send + 'static,
{
    fn call(&self, request: BootRequest) -> BoxFuture<'static, Result<BootResponse>> {
        Box::pin(self(request))
    }
}

pub(crate) struct RequestScopedRouteHandler<F> {
    factory: F,
}

impl<F> RequestScopedRouteHandler<F> {
    pub(crate) fn new(factory: F) -> Self {
        Self { factory }
    }
}

impl<F, H> RouteHandler for RequestScopedRouteHandler<F>
where
    F: Fn(&ModuleRef) -> Result<H> + Send + Sync + 'static,
    H: RouteHandler,
{
    fn call(&self, request: BootRequest) -> BoxFuture<'static, Result<BootResponse>> {
        let Some(module_ref) = request.module_ref().cloned() else {
            return Box::pin(async {
                Err(BootError::Internal(
                    "request-scoped route requires a module context".to_string(),
                ))
            });
        };

        match (self.factory)(&module_ref) {
            Ok(handler) => handler.call(request),
            Err(error) => Box::pin(async move { Err(error) }),
        }
    }
}

pub(crate) struct ProviderRouteHandler<T, F> {
    factory: F,
    marker: PhantomData<fn() -> T>,
}

impl<T, F> ProviderRouteHandler<T, F> {
    pub(crate) fn new(factory: F) -> Self {
        Self {
            factory,
            marker: PhantomData,
        }
    }
}

impl<T, F> RouteHandler for ProviderRouteHandler<T, F>
where
    T: Send + Sync + 'static,
    F: Fn(Arc<T>) -> Result<RouteDefinition> + Send + Sync + 'static,
{
    fn call(&self, request: BootRequest) -> BoxFuture<'static, Result<BootResponse>> {
        let Some(module_ref) = request.module_ref().cloned() else {
            return Box::pin(async {
                Err(BootError::Internal(
                    "provider-backed route requires a module context".to_string(),
                ))
            });
        };

        let route = module_ref
            .get::<T>()
            .and_then(|controller| (self.factory)(controller));
        match route {
            Ok(route) => route.handler.call(request),
            Err(error) => Box::pin(async move { Err(error) }),
        }
    }
}