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use std::borrow::Cow;
use futures::{sync::mpsc, Future, Stream};
use crate::{Reporter, Sampler, Span, SpanBuilder, SpanState};
pub struct Tracer<S, R>
where
S: Sampler,
R: Reporter,
{
service_name: Cow<'static, str>,
sampler: S,
reporter: Option<R>,
sender: mpsc::UnboundedSender<Span>,
receiver: Option<mpsc::UnboundedReceiver<Span>>,
}
impl<S, R> Tracer<S, R>
where
S: Sampler,
R: Reporter,
{
pub fn new<N>(service_name: N, sampler: S, reporter: R) -> Self
where
N: Into<Cow<'static, str>>,
{
let (sender, receiver) = mpsc::unbounded();
Self {
service_name: service_name.into(),
sampler,
sender,
reporter: Some(reporter),
receiver: Some(receiver),
}
}
pub fn serve(&mut self) -> (impl Future<Item = (), Error = ()>) {
let mut reporter = self.reporter.take().unwrap();
self.receiver
.take()
.unwrap()
.for_each(move |span| {
reporter.report(&span);
Ok(())
})
.map_err(|_| ())
}
}
impl<S, R> opentracing_rs_core::Tracer<SpanState, SpanBuilder> for Tracer<S, R>
where
S: Sampler,
R: Reporter,
{
fn span<N>(&mut self, operation_name: N) -> SpanBuilder
where
N: Into<String>,
{
SpanBuilder::new(operation_name, self.sender.clone())
}
}