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use crate::sdk::{resource::ResourceDetector, Resource};
use crate::{Key, KeyValue};
use std::env;
use std::time::Duration;
const OTEL_RESOURCE_ATTRIBUTES: &str = "OTEL_RESOURCE_ATTRIBUTES";
const OTEL_SERVICE_NAME: &str = "OTEL_SERVICE_NAME";
#[derive(Debug)]
pub struct EnvResourceDetector {
_private: (),
}
impl ResourceDetector for EnvResourceDetector {
fn detect(&self, _timeout: Duration) -> Resource {
match env::var(OTEL_RESOURCE_ATTRIBUTES) {
Ok(s) if !s.is_empty() => construct_otel_resources(s),
Ok(_) | Err(_) => Resource::new(vec![]),
}
}
}
impl EnvResourceDetector {
pub fn new() -> Self {
EnvResourceDetector { _private: () }
}
}
impl Default for EnvResourceDetector {
fn default() -> Self {
EnvResourceDetector::new()
}
}
fn construct_otel_resources(s: String) -> Resource {
Resource::new(s.split_terminator(',').filter_map(|entry| {
let mut parts = entry.splitn(2, '=');
let key = parts.next()?.trim();
let value = parts.next()?.trim();
if value.find('=').is_some() {
return None;
}
Some(KeyValue::new(key.to_owned(), value.to_owned()))
}))
}
#[derive(Debug)]
pub struct SdkProvidedResourceDetector;
impl ResourceDetector for SdkProvidedResourceDetector {
fn detect(&self, _timeout: Duration) -> Resource {
Resource::new(vec![KeyValue::new(
"service.name",
env::var(OTEL_SERVICE_NAME)
.ok()
.filter(|s| !s.is_empty())
.unwrap_or_else(|| {
EnvResourceDetector::new()
.detect(Duration::from_secs(0))
.get(Key::new("service.name"))
.map(|v| v.to_string())
.filter(|s| !s.is_empty())
.unwrap_or_else(|| "unknown_service".to_string())
}),
)])
}
}
#[cfg(test)]
mod tests {
use crate::sdk::resource::env::{
SdkProvidedResourceDetector, OTEL_RESOURCE_ATTRIBUTES, OTEL_SERVICE_NAME,
};
use crate::sdk::resource::{EnvResourceDetector, Resource, ResourceDetector};
use crate::{Key, KeyValue, Value};
use std::time::Duration;
use std::{env, time};
#[test]
fn test_read_from_env() {
env::set_var(OTEL_RESOURCE_ATTRIBUTES, "key=value, k = v , a= x, a=z");
env::set_var("irrelevant".to_uppercase(), "20200810");
let detector = EnvResourceDetector::new();
let resource = detector.detect(time::Duration::from_secs(5));
assert_eq!(
resource,
Resource::new(vec![
KeyValue::new("key", "value"),
KeyValue::new("k", "v"),
KeyValue::new("a", "x"),
KeyValue::new("a", "z"),
])
);
env::set_var(OTEL_RESOURCE_ATTRIBUTES, "");
let detector = EnvResourceDetector::new();
let resource = detector.detect(time::Duration::from_secs(5));
assert!(resource.is_empty());
}
#[test]
fn test_sdk_provided_resource_detector() {
const SERVICE_NAME: &str = "service.name";
let no_env = SdkProvidedResourceDetector.detect(Duration::from_secs(1));
assert_eq!(
no_env.get(Key::from_static_str(SERVICE_NAME)),
Some(Value::from("unknown_service")),
);
env::set_var(OTEL_SERVICE_NAME, "test service");
let with_service = SdkProvidedResourceDetector.detect(Duration::from_secs(1));
assert_eq!(
with_service.get(Key::from_static_str(SERVICE_NAME)),
Some(Value::from("test service")),
);
env::set_var(OTEL_SERVICE_NAME, "");
env::set_var(OTEL_RESOURCE_ATTRIBUTES, "service.name=test service1");
let with_service = SdkProvidedResourceDetector.detect(Duration::from_secs(1));
assert_eq!(
with_service.get(Key::from_static_str(SERVICE_NAME)),
Some(Value::from("test service1"))
);
env::set_var(OTEL_SERVICE_NAME, "test service");
let with_service = SdkProvidedResourceDetector.detect(Duration::from_secs(1));
assert_eq!(
with_service.get(Key::from_static_str(SERVICE_NAME)),
Some(Value::from("test service"))
);
env::set_var(OTEL_RESOURCE_ATTRIBUTES, "");
env::set_var(OTEL_SERVICE_NAME, "");
}
}