modo-rs 0.8.0

Rust web framework for small monolithic apps
Documentation 
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use std::future::Future;

use crate::error::Result;

use super::context::{CronContext, FromCronContext};

/// A type-erased async function that can be used as a cron job handler.
///
/// Implemented automatically for any `async fn` whose arguments all implement
/// [`FromCronContext`]. Up to 12 handler arguments are supported. A
/// zero-argument handler is also supported.
///
/// Handlers must be `Clone + Send + 'static` so the scheduler can invoke them
/// across multiple ticks.
///
/// # Examples
///
/// ```rust,no_run
/// use modo::cron::Meta;
/// use modo::Result;
///
/// // Zero-argument handler
/// async fn heartbeat() -> Result<()> {
///     Ok(())
/// }
///
/// // Handler that receives job metadata
/// async fn with_meta(meta: Meta) -> Result<()> {
///     tracing::info!(job = %meta.name, tick = %meta.tick, "tick");
///     Ok(())
/// }
/// ```
pub trait CronHandler<Args>: Clone + Send + 'static {
    /// Invoke the handler with the given execution context.
    fn call(self, ctx: CronContext) -> impl Future<Output = Result<()>> + Send;
}

// 0 args
impl<F, Fut> CronHandler<()> for F
where
    F: FnOnce() -> Fut + Clone + Send + 'static,
    Fut: Future<Output = Result<()>> + Send,
{
    async fn call(self, _ctx: CronContext) -> Result<()> {
        (self)().await
    }
}

macro_rules! impl_cron_handler {
    ($($T:ident),+) => {
        impl<F, Fut, $($T),+> CronHandler<($($T,)+)> for F
        where
            F: FnOnce($($T),+) -> Fut + Clone + Send + 'static,
            Fut: Future<Output = Result<()>> + Send,
            $($T: FromCronContext,)+
        {
            #[allow(non_snake_case)]
            async fn call(self, ctx: CronContext) -> Result<()> {
                $(let $T = $T::from_cron_context(&ctx)?;)+
                (self)($($T),+).await
            }
        }
    };
}

impl_cron_handler!(T1);
impl_cron_handler!(T1, T2);
impl_cron_handler!(T1, T2, T3);
impl_cron_handler!(T1, T2, T3, T4);
impl_cron_handler!(T1, T2, T3, T4, T5);
impl_cron_handler!(T1, T2, T3, T4, T5, T6);
impl_cron_handler!(T1, T2, T3, T4, T5, T6, T7);
impl_cron_handler!(T1, T2, T3, T4, T5, T6, T7, T8);
impl_cron_handler!(T1, T2, T3, T4, T5, T6, T7, T8, T9);
impl_cron_handler!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10);
impl_cron_handler!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11);
impl_cron_handler!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12);