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slog 2.0.0-alpha.3

Structured, composable logging for Rust
Documentation 
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pub trait DrainMaker<Fr: Drain> {
    type To;

    fn make_from(self, drain: Fr) -> Self::To;

    fn make(self) -> Self::To;

    fn new() -> () {
        ()
    }


    fn filter<F>(self, f: F) -> FilterMaker<Self, F>
        where Self: Sized,
              F: 'static + Send + Sync + Fn(&Record) -> bool
    {
        FilterMaker {
            inner: self,
            filter_fn: f,
        }
    }

    fn fuse(self) -> FuseMaker<Self>
        where Self: Sized
    {
        FuseMaker(self)
    }

    fn discard(self) -> DiscardMaker<Self>
        where Self: Sized
    {
        DiscardMaker(self)
    }

    /*
    fn filter<F>(self) -> FilterMaker<Self>
        where  F: 'static + Send + Sync + Fn(&Record) -> bool {
            FilterConstructor{
                self
            }
        }
        */
}
//
//
// ()
//
//
// FilterMaker<()> -> Filter<Discard>
//
//JsonMaker<FilterMaker<()> -> Filter<Json>
//
//().fuse().filter(Debug).async().json().make()
// JsonMaker<AsyncMaker<FilterMaker<Fuse<()>>>> -> Filter<Async<Json>>
//

impl<FrTo> DrainMaker<FrTo> for ()
    where FrTo: Drain
{
    type To = FrTo;

    fn make_from(self, drain: FrTo) -> FrTo {
        drain
    }

    fn make(self) -> FrTo {
        unimplemented!()
    }
}

pub struct FuseMaker<InnerMaker>(InnerMaker);

impl<Fr, InnerMaker> DrainMaker<Fr> for FuseMaker<InnerMaker>
    where InnerMaker: DrainMaker<Fuse<Fr>>,
          Fr: Drain,
          <Fr as Drain>::Err: core::fmt::Display
{
    type To = InnerMaker::To;

    fn make_from(self, drain: Fr) -> Self::To {
        self.0.make_from(Fuse::new(drain))
    }

    fn make(self) -> Self::To {
        self.0.make_from(Fuse::new(Discard))
    }
}

pub struct FilterMaker<InnerMaker, F>
    where F: 'static + Send + Sync + Fn(&Record) -> bool
{
    filter_fn: F,
    inner: InnerMaker,
}

impl<Fr, InnerMaker, F> DrainMaker<Fr> for FilterMaker<InnerMaker, F>
    where InnerMaker: DrainMaker<Filter<Fr>>,
          Fr: Drain,
          F: 'static + Send + Sync + Fn(&Record) -> bool
{
    type To = InnerMaker::To;

    fn make_from(self, drain: Fr) -> Self::To {
        self.inner.make_from(Filter::new(drain, self.filter_fn))
    }

    fn make(self) -> Self::To {
        self.inner.make_from(Discard)
    }
}

pub struct DiscardMaker<InnerMaker>(InnerMaker);

impl<Fr, InnerMaker> DrainMaker<Fr> for DiscardMaker<InnerMaker>
    where InnerMaker: DrainMaker<Discard>,
          Fr: Drain
{
    type To = InnerMaker::To;

    fn make_from(self, drain: Fr) -> Self::To {
        self.0.make_from(Discard)
    }

    fn make(self) -> Self::To {
        self.0.make_from(Discard)
    }
}

#[test]
fn maker() {
    use {DrainMaker, Filter};
    let drain = DrainMaker::new().fuse().filter(|_| true).discard().make();

    let _log = Logger::root(drain, o!("version" => env!("CARGO_PKG_VERSION")));
}