blueprint-router 0.2.0-alpha.5

Job routing utilities for the Blueprint SDK
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use crate::future::Route;
use alloc::boxed::Box;
use blueprint_core::{IntoJobResult, Job, JobCall};

use core::fmt;
use tower::util::{MapErrLayer, MapResponseLayer};
use tower::{BoxError, Layer, Service};

pub(crate) struct BoxedIntoRoute<S, E>(Box<dyn ErasedIntoRoute<S, E>>);

impl<Ctx> BoxedIntoRoute<Ctx, BoxError>
where
    Ctx: Clone + Send + Sync + 'static,
{
    pub(crate) fn from_job<J, T>(job: J) -> Self
    where
        J: Job<T, Ctx>,
        T: 'static,
    {
        Self(Box::new(MakeErasedJob {
            job,
            into_route: |job, context| Route::new(Job::with_context(job, context)),
        }))
    }
}

impl<Ctx, E> BoxedIntoRoute<Ctx, E> {
    pub(crate) fn into_route(self, context: Ctx) -> Route<E> {
        self.0.into_route(context)
    }

    pub(crate) fn layer<L>(self, layer: L) -> BoxedIntoRoute<Ctx, E>
    where
        L: Layer<Route<E>> + Clone + Send + Sync + 'static,
        L::Service: Service<JobCall> + Clone + Send + Sync + 'static,
        <L::Service as Service<JobCall>>::Response: IntoJobResult + 'static,
        <L::Service as Service<JobCall>>::Error: Into<E> + 'static,
        <L::Service as Service<JobCall>>::Future: Send + 'static,
        E: 'static,
        Ctx: 'static,
    {
        let layer = (
            MapErrLayer::new(Into::into),
            MapResponseLayer::new(IntoJobResult::into_job_result),
            layer,
        );
        BoxedIntoRoute(Box::new(Map {
            inner: self.0,
            layer: Box::new(|route| route.layer(layer)),
        }))
    }
}

impl<Ctx, E> Clone for BoxedIntoRoute<Ctx, E> {
    fn clone(&self) -> Self {
        Self(self.0.clone_box())
    }
}

impl<Ctx, E> fmt::Debug for BoxedIntoRoute<Ctx, E> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_tuple("BoxedIntoRoute").finish()
    }
}

pub(crate) trait ErasedIntoRoute<Ctx, E>: Send + Sync {
    fn clone_box(&self) -> Box<dyn ErasedIntoRoute<Ctx, E>>;

    fn into_route(self: Box<Self>, context: Ctx) -> Route<E>;
}

pub(crate) struct MakeErasedJob<J, Ctx> {
    pub(crate) job: J,
    pub(crate) into_route: fn(J, Ctx) -> Route,
}

impl<J, Ctx> ErasedIntoRoute<Ctx, BoxError> for MakeErasedJob<J, Ctx>
where
    J: Clone + Send + Sync + 'static,
    Ctx: 'static,
{
    fn clone_box(&self) -> Box<dyn ErasedIntoRoute<Ctx, BoxError>> {
        Box::new(self.clone())
    }

    fn into_route(self: Box<Self>, context: Ctx) -> Route {
        (self.into_route)(self.job, context)
    }
}

impl<J, Ctx> Clone for MakeErasedJob<J, Ctx>
where
    J: Clone,
{
    fn clone(&self) -> Self {
        Self {
            job: self.job.clone(),
            into_route: self.into_route,
        }
    }
}

pub(crate) struct Map<Ctx, E, E2> {
    pub(crate) inner: Box<dyn ErasedIntoRoute<Ctx, E>>,
    pub(crate) layer: Box<dyn LayerFn<E, E2>>,
}

impl<Ctx, E, E2> ErasedIntoRoute<Ctx, E2> for Map<Ctx, E, E2>
where
    Ctx: 'static,
    E: 'static,
    E2: 'static,
{
    fn clone_box(&self) -> Box<dyn ErasedIntoRoute<Ctx, E2>> {
        Box::new(Self {
            inner: self.inner.clone_box(),
            layer: self.layer.clone_box(),
        })
    }

    fn into_route(self: Box<Self>, context: Ctx) -> Route<E2> {
        (self.layer)(self.inner.into_route(context))
    }
}

pub(crate) trait LayerFn<E, E2>: FnOnce(Route<E>) -> Route<E2> + Send + Sync {
    fn clone_box(&self) -> Box<dyn LayerFn<E, E2>>;
}

impl<F, E, E2> LayerFn<E, E2> for F
where
    F: FnOnce(Route<E>) -> Route<E2> + Clone + Send + Sync + 'static,
{
    fn clone_box(&self) -> Box<dyn LayerFn<E, E2>> {
        Box::new(self.clone())
    }
}