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main.rs
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main.rs
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use futures_util::{Stream, StreamExt as _};
use opentelemetry::global::shutdown_tracer_provider;
use opentelemetry::sdk::export::metrics::{ExportKind, ExportKindFor};
use opentelemetry::sdk::{
export::metrics::{Aggregator, AggregatorSelector},
metrics::{aggregators, PushController},
};
use opentelemetry::trace::TraceError;
use opentelemetry::{
baggage::BaggageExt,
metrics::{self, Descriptor, ObserverResult},
trace::{TraceContextExt, Tracer},
Context, Key, KeyValue,
};
use opentelemetry::{global, sdk::trace as sdktrace};
use opentelemetry_otlp::Protocol;
use opentelemetry_otlp::{ExportConfig, WithExportConfig};
use std::error::Error;
use std::sync::Arc;
use std::time::Duration;
fn init_tracer() -> Result<sdktrace::Tracer, TraceError> {
opentelemetry_otlp::new_pipeline()
.tracing()
.with_exporter(
opentelemetry_otlp::new_exporter()
.tonic()
.with_endpoint("http://localhost:4317"),
)
.install_batch(opentelemetry::runtime::Tokio)
}
// Skip first immediate tick from tokio, not needed for async_std.
fn delayed_interval(duration: Duration) -> impl Stream<Item = tokio::time::Instant> {
opentelemetry::util::tokio_interval_stream(duration).skip(1)
}
#[derive(Debug)]
struct CustomAggregator();
impl AggregatorSelector for CustomAggregator {
fn aggregator_for(
&self,
descriptor: &Descriptor,
) -> Option<Arc<(dyn Aggregator + Sync + std::marker::Send + 'static)>> {
match descriptor.name() {
"ex.com.one" => Some(Arc::new(aggregators::last_value())),
"ex.com.two" => Some(Arc::new(aggregators::histogram(
descriptor,
&[0.0, 0.5, 1.0, 10.0],
))),
_ => Some(Arc::new(aggregators::sum())),
}
}
}
#[derive(Debug, Clone)]
struct CustomExportKindFor();
impl ExportKindFor for CustomExportKindFor {
fn export_kind_for(&self, _descriptor: &Descriptor) -> ExportKind {
ExportKind::Delta
}
}
fn init_meter() -> metrics::Result<PushController> {
let exporter_config = ExportConfig {
endpoint: "http://localhost:4317".to_string(),
protocol: Protocol::Grpc,
..ExportConfig::default()
};
opentelemetry_otlp::new_pipeline()
.metrics(tokio::spawn, delayed_interval)
.with_exporter(
opentelemetry_otlp::new_exporter()
.tonic()
.with_export_config(exporter_config),
)
.with_export_kind(CustomExportKindFor())
.with_aggregator_selector(CustomAggregator())
.build()
}
const FOO_KEY: Key = Key::from_static_str("ex.com/foo");
const BAR_KEY: Key = Key::from_static_str("ex.com/bar");
const LEMONS_KEY: Key = Key::from_static_str("lemons");
const ANOTHER_KEY: Key = Key::from_static_str("ex.com/another");
lazy_static::lazy_static! {
static ref COMMON_ATTRIBUTES: [KeyValue; 4] = [
LEMONS_KEY.i64(10),
KeyValue::new("A", "1"),
KeyValue::new("B", "2"),
KeyValue::new("C", "3"),
];
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
// By binding the result to an unused variable, the lifetime of the variable
// matches the containing block, reporting traces and metrics during the whole
// execution.
let _ = init_tracer()?;
let _started = init_meter()?;
let tracer = global::tracer("ex.com/basic");
let meter = global::meter("ex.com/basic");
let one_metric_callback =
|res: ObserverResult<f64>| res.observe(1.0, COMMON_ATTRIBUTES.as_ref());
let _ = meter
.f64_value_observer("ex.com.one", one_metric_callback)
.with_description("A ValueObserver set to 1.0")
.init();
let histogram_two = meter.f64_histogram("ex.com.two").init();
let another_recorder = meter.f64_histogram("ex.com.two").init();
another_recorder.record(5.5, COMMON_ATTRIBUTES.as_ref());
let _baggage =
Context::current_with_baggage(vec![FOO_KEY.string("foo1"), BAR_KEY.string("bar1")])
.attach();
let histogram = histogram_two.bind(COMMON_ATTRIBUTES.as_ref());
tracer.in_span("operation", |cx| {
let span = cx.span();
span.add_event(
"Nice operation!".to_string(),
vec![Key::new("bogons").i64(100)],
);
span.set_attribute(ANOTHER_KEY.string("yes"));
meter.record_batch_with_context(
// Note: call-site variables added as context Entries:
&Context::current_with_baggage(vec![ANOTHER_KEY.string("xyz")]),
COMMON_ATTRIBUTES.as_ref(),
vec![histogram_two.measurement(2.0)],
);
tracer.in_span("Sub operation...", |cx| {
let span = cx.span();
span.set_attribute(LEMONS_KEY.string("five"));
span.add_event("Sub span event".to_string(), vec![]);
histogram.record(1.3);
});
});
// wait for 1 minutes so that we could see metrics being pushed via OTLP every 10 seconds.
tokio::time::sleep(Duration::from_secs(60)).await;
shutdown_tracer_provider();
Ok(())
}