rok-mail 0.1.0

Email support for the rok ecosystem — Mailable trait, log/SMTP drivers
Documentation 
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use std::{
    future::Future,
    pin::Pin,
    sync::Arc,
    task::{Context, Poll},
};

use axum::http::Request;
use tower::{Layer, Service};

use crate::{mail::scope_config, MailConfig};

/// Tower layer that scopes a `MailConfig` into every request via task-local
/// storage. After installing this layer, call `Mail::send()` without an
/// explicit config from anywhere inside a request handler.
#[derive(Clone)]
pub struct MailLayer {
    config: Arc<MailConfig>,
}

impl MailLayer {
    pub fn new(config: MailConfig) -> Self {
        Self {
            config: Arc::new(config),
        }
    }
}

impl<S> Layer<S> for MailLayer {
    type Service = MailService<S>;

    fn layer(&self, inner: S) -> Self::Service {
        MailService {
            inner,
            config: self.config.clone(),
        }
    }
}

#[derive(Clone)]
pub struct MailService<S> {
    inner: S,
    config: Arc<MailConfig>,
}

impl<S, ReqBody> Service<Request<ReqBody>> for MailService<S>
where
    S: Service<Request<ReqBody>> + Send + Clone + 'static,
    S::Future: Send + 'static,
    ReqBody: Send + 'static,
{
    type Response = S::Response;
    type Error = S::Error;
    type Future = Pin<Box<dyn Future<Output = Result<S::Response, S::Error>> + Send + 'static>>;

    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.inner.poll_ready(cx)
    }

    fn call(&mut self, req: Request<ReqBody>) -> Self::Future {
        let config = self.config.clone();
        let future = self.inner.call(req);
        Box::pin(scope_config(config, future))
    }
}