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mod.rs
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mod.rs
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//! # OpenTelemetry Trace SDK
//!
//! The tracing SDK consist of a few main structs:
//!
//! * The [`Tracer`] struct which performs all tracing operations.
//! * The [`Span`] struct with is a mutable object storing information about the
//! current operation execution.
//! * The [`TracerProvider`] struct which configures and produces [`Tracer`]s.
mod config;
mod events;
mod evicted_hash_map;
mod evicted_queue;
mod id_generator;
mod links;
mod provider;
mod sampler;
mod span;
mod span_limit;
mod span_processor;
mod tracer;
pub use config::{config, Config};
pub use events::SpanEvents;
pub use evicted_hash_map::EvictedHashMap;
pub use evicted_queue::EvictedQueue;
pub use id_generator::{aws::XrayIdGenerator, IdGenerator, RandomIdGenerator};
pub use links::SpanLinks;
pub use provider::{Builder, TracerProvider};
pub use sampler::{Sampler, ShouldSample};
pub use span::Span;
pub use span_limit::SpanLimits;
pub use span_processor::{
BatchConfig, BatchSpanProcessor, BatchSpanProcessorBuilder, SimpleSpanProcessor, SpanProcessor,
};
pub use tracer::Tracer;
#[cfg(feature = "jaeger_remote_sampler")]
pub use sampler::{JaegerRemoteSampler, JaegerRemoteSamplerBuilder};
#[cfg(test)]
mod runtime_tests;
#[cfg(all(test, feature = "testing"))]
mod tests {
use super::*;
use crate::{
testing::trace::InMemorySpanExporterBuilder,
trace::span_limit::{DEFAULT_MAX_EVENT_PER_SPAN, DEFAULT_MAX_LINKS_PER_SPAN},
};
use opentelemetry::{
trace::{
Event, Link, Span, SpanBuilder, SpanContext, SpanId, TraceFlags, TraceId, Tracer,
TracerProvider as _,
},
KeyValue,
};
#[test]
fn in_span() {
// Arrange
let exporter = InMemorySpanExporterBuilder::new().build();
let provider = TracerProvider::builder()
.with_span_processor(SimpleSpanProcessor::new(Box::new(exporter.clone())))
.build();
// Act
let tracer = provider.tracer("test_tracer");
tracer.in_span("span_name", |_cx| {});
provider.force_flush();
// Assert
let exported_spans = exporter
.get_finished_spans()
.expect("Spans are expected to be exported.");
assert_eq!(exported_spans.len(), 1);
let span = &exported_spans[0];
assert_eq!(span.name, "span_name");
assert_eq!(span.instrumentation_lib.name, "test_tracer");
}
#[test]
fn tracer_start() {
// Arrange
let exporter = InMemorySpanExporterBuilder::new().build();
let provider = TracerProvider::builder()
.with_span_processor(SimpleSpanProcessor::new(Box::new(exporter.clone())))
.build();
// Act
let tracer = provider.tracer("test_tracer");
let mut span = tracer.start("span_name");
span.set_attribute(KeyValue::new("key1", "value1"));
drop(span);
provider.force_flush();
// Assert
let exported_spans = exporter
.get_finished_spans()
.expect("Spans are expected to be exported.");
assert_eq!(exported_spans.len(), 1);
let span = &exported_spans[0];
assert_eq!(span.name, "span_name");
assert_eq!(span.instrumentation_lib.name, "test_tracer");
}
#[test]
fn exceed_span_links_limit() {
// Arrange
let exporter = InMemorySpanExporterBuilder::new().build();
let provider = TracerProvider::builder()
.with_span_processor(SimpleSpanProcessor::new(Box::new(exporter.clone())))
.build();
// Act
let tracer = provider.tracer("test_tracer");
let mut links = Vec::new();
for _i in 0..(DEFAULT_MAX_LINKS_PER_SPAN * 2) {
links.push(Link::new(
SpanContext::new(
TraceId::from_u128(12),
SpanId::from_u64(12),
TraceFlags::default(),
false,
Default::default(),
),
Vec::new(),
))
}
let span_builder = SpanBuilder::from_name("span_name").with_links(links);
let mut span = tracer.build(span_builder);
span.end();
provider.force_flush();
// Assert
let exported_spans = exporter
.get_finished_spans()
.expect("Spans are expected to be exported.");
assert_eq!(exported_spans.len(), 1);
let span = &exported_spans[0];
assert_eq!(span.name, "span_name");
assert_eq!(span.links.len(), DEFAULT_MAX_LINKS_PER_SPAN as usize);
}
#[test]
fn exceed_span_events_limit() {
// Arrange
let exporter = InMemorySpanExporterBuilder::new().build();
let provider = TracerProvider::builder()
.with_span_processor(SimpleSpanProcessor::new(Box::new(exporter.clone())))
.build();
// Act
let tracer = provider.tracer("test_tracer");
let mut events = Vec::new();
for _i in 0..(DEFAULT_MAX_EVENT_PER_SPAN * 2) {
events.push(Event::with_name("test event"))
}
// add events via span builder
let span_builder = SpanBuilder::from_name("span_name").with_events(events);
let mut span = tracer.build(span_builder);
// add events using span api after building the span
span.add_event("test event again, after span builder", Vec::new());
span.add_event("test event once again, after span builder", Vec::new());
span.end();
provider.force_flush();
// Assert
let exported_spans = exporter
.get_finished_spans()
.expect("Spans are expected to be exported.");
assert_eq!(exported_spans.len(), 1);
let span = &exported_spans[0];
assert_eq!(span.name, "span_name");
assert_eq!(span.events.len(), DEFAULT_MAX_EVENT_PER_SPAN as usize);
assert_eq!(span.events.dropped_count, DEFAULT_MAX_EVENT_PER_SPAN + 2);
}
}