bdbaf80073It is not uncommon that users who are new to tracing look at the examples in the `master` branch of the repository and find that they don't compile. This is because they are examples which compile with the code from the master branch, which is for the as yet unreleased tracing 0.2.0 ecosystem. Users should instead go to the `v0.1.x` branch to find examples compatible with the crates published on crates.io. This change adds a doc-comment to the beginning of every example file informing the user of this fact and suggesting that they check out the `v0.1.x` branch instead.
105 lines
2.6 KiB
Rust
105 lines
2.6 KiB
Rust
//! NOTE: This is pre-release documentation for the upcoming tracing 0.2.0 ecosystem. For the
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//! release examples, please see the `v0.1.x` branch instead.
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use std::sync::atomic::{AtomicUsize, Ordering};
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use tracing::debug;
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use tracing_core::{
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collect::Collect,
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event::Event,
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metadata::Metadata,
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span::{Attributes, Current, Id, Record},
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};
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use tracing_serde::AsSerde;
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use serde_json::json;
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#[path = "fmt/yak_shave.rs"]
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mod yak_shave;
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pub struct JsonCollector {
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next_id: AtomicUsize, // you need to assign span IDs, so you need a counter
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}
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impl Collect for JsonCollector {
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fn enabled(&self, metadata: &Metadata<'_>) -> bool {
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let json = json!({
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"enabled": {
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"metadata": metadata.as_serde(),
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}});
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println!("{}", json);
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true
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}
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fn new_span(&self, attrs: &Attributes<'_>) -> Id {
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let id = self.next_id.fetch_add(1, Ordering::Relaxed);
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let id = Id::from_u64(id as u64);
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let json = json!({
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"new_span": {
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"attributes": attrs.as_serde(),
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"id": id.as_serde(),
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}});
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println!("{}", json);
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id
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}
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fn record(&self, span: &Id, values: &Record<'_>) {
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let json = json!({
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"record": {
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"span": span.as_serde(),
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"values": values.as_serde(),
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}});
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println!("{}", json);
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}
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fn record_follows_from(&self, span: &Id, follows: &Id) {
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let json = json!({
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"record_follows_from": {
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"span": span.as_serde(),
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"follows": follows.as_serde(),
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}});
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println!("{}", json);
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}
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fn event(&self, event: &Event<'_>) {
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let json = json!({
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"event": event.as_serde(),
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});
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println!("{}", json);
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}
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fn enter(&self, span: &Id) {
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let json = json!({
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"enter": span.as_serde(),
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});
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println!("{}", json);
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}
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fn exit(&self, span: &Id) {
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let json = json!({
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"exit": span.as_serde(),
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});
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println!("{}", json);
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}
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fn current_span(&self) -> Current {
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Current::unknown()
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}
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}
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fn main() {
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let collector = JsonCollector {
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next_id: AtomicUsize::new(1),
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};
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tracing::collect::with_default(collector, || {
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let number_of_yaks = 3;
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debug!("preparing to shave {} yaks", number_of_yaks);
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let number_shaved = yak_shave::shave_all(number_of_yaks);
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debug!(
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message = "yak shaving completed.",
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all_yaks_shaved = number_shaved == number_of_yaks,
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);
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});
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}
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