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use crate::async_connect::AsyncConnect;
use crate::connect::Connect;
use std::future::Future;
pub type Error = Box<dyn std::error::Error>;
pub trait Linkable {
type OUT: Send + Sync;
fn then_async<F, FUT, NXT>(self: Self, f: F) -> AsyncConnect<Self, F>
where
F: Fn(Self::OUT) -> FUT,
FUT: Future<Output = NXT> + Send + Sync,
Self: Sized,
{
AsyncConnect {
prev: self,
next: f,
}
}
fn then_async_result<F, FUT, NXT>(self: Self, f: F) -> AsyncConnect<Self, ErrorFuc<F>>
where
F: Fn(Self::OUT) -> FUT,
FUT: Future<Output = Result<NXT, Error>> + Send + Sync,
Self: Sized,
{
AsyncConnect {
prev: self,
next: ErrorFuc::new(f),
}
}
fn then<F, NXT>(self: Self, f: F) -> Connect<Self, F>
where
F: Fn(Self::OUT) -> NXT,
Self: Sized,
{
Connect {
prev: self,
next: f,
}
}
fn then_result<F, NXT>(self: Self, f: F) -> Connect<Self, ErrorFuc<F>>
where
F: Fn(Self::OUT) -> Result<NXT, Error>,
Self: Sized,
{
Connect {
prev: self,
next: ErrorFuc::new(f),
}
}
}
#[async_trait::async_trait]
pub trait Pipeline: Linkable {
type IN: Send + Sync;
async fn process(self: &Self, input: Self::IN) -> Result<Self::OUT, Error>;
}
pub struct ErrorFuc<F> {
pub f: F,
}
impl<F> ErrorFuc<F> {
fn new(f: F) -> Self {
ErrorFuc { f }
}
}