observability 0.1.3

Experimental tracing ideas
Documentation 
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use std::error::Error;

use observability::{span_context, MsgWrap};
use tokio::sync::mpsc;
use tracing::*;

#[derive(Debug)]
struct Foo;

struct MyChannel {
    rx: mpsc::Receiver<MsgWrap<Foo>>,
    tx: mpsc::Sender<MsgWrap<Foo>>,
}

impl MyChannel {
    fn new(tx: mpsc::Sender<MsgWrap<Foo>>, rx: mpsc::Receiver<MsgWrap<Foo>>) -> Self {
        Self { rx, tx }
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    observability::test_run_open().ok();
    span_context!();
    span_context!(current, Level::DEBUG);
    let (tx1, rx2) = mpsc::channel(10);
    let (tx2, rx1) = mpsc::channel(10);
    let c1 = MyChannel::new(tx1.clone(), rx1);
    let c2 = MyChannel::new(tx2, rx2);
    let (tx4, rx4) = mpsc::channel(10);
    let (_, dead) = mpsc::channel(1);
    let c3 = MyChannel::new(tx1, rx4);
    let c4 = MyChannel::new(tx4, dead);
    let mut jh = Vec::new();
    jh.push(tokio::task::spawn(async { a(c1).await.unwrap() }));
    jh.push(tokio::task::spawn(async { b(c2, c4).await.unwrap() }));
    jh.push(tokio::task::spawn(async { c(c3).await.unwrap() }));

    for h in jh {
        h.await?;
    }
    Ok(())
}

#[instrument(skip(channel))]
async fn a(mut channel: MyChannel) -> Result<(), Box<dyn Error>> {
    for _ in 0..10 {
        span_context!(Span::current());
        channel.tx.send(Foo.into()).await?;
        if let Some(r) = channel.rx.recv().await {
            r.inner();
        }
    }
    tokio::time::delay_for(std::time::Duration::from_millis(500)).await;
    Ok(())
}

#[instrument(skip(channel, to_c))]
async fn b(mut channel: MyChannel, mut to_c: MyChannel) -> Result<(), Box<dyn Error>> {
    for _ in 0..10 {
        span_context!(Span::current());
        if let Some(r) = channel.rx.recv().await {
            r.inner();
        }
        channel.tx.send(Foo.into()).await?;
        to_c.tx.send(Foo.into()).await?;
    }
    tokio::time::delay_for(std::time::Duration::from_millis(500)).await;
    Ok(())
}

#[instrument(skip(from_b_to_a))]
async fn c(mut from_b_to_a: MyChannel) -> Result<(), Box<dyn Error>> {
    for _ in 0..10 {
        span_context!(Span::current());
        if let Some(r) = from_b_to_a.rx.recv().await {
            r.inner();
        }
        from_b_to_a.tx.send(Foo.into()).await?;
    }
    tokio::time::delay_for(std::time::Duration::from_millis(500)).await;
    Ok(())
}