Struct OtelPathNames

pub struct OtelPathNames(/* private fields */);

OtelPathNames allows including templated paths in the spans created by DefaultSpanBackend and SpanBackendWithUrl.

When creating spans this can be used to try to match the path against some known paths. If the path matches value returned is the templated path. This can be used in span names as it will not contain values that would increase the cardinality.

/// # use reqwest_middleware::Result;
use reqwest_middleware::{ClientBuilder, Extension};
use reqwest_tracing::{
    TracingMiddleware, OtelPathNames
};
let reqwest_client = reqwest::Client::builder().build()?;
let client = ClientBuilder::new(reqwest_client)
   // Inserts the extension before the request is started
   .with_init(Extension(OtelPathNames::known_paths(["/payment/{paymentId}"])?))
   // Makes use of that extension to specify the otel name
   .with(TracingMiddleware::default())
   .build();

let resp = client.get("https://truelayer.com/payment/id-123").send().await?;

// Or specify it on the individual request (will take priority)
let resp = client.post("https://api.truelayer.com/payment/id-123/authorization-flow")
    .with_extension(OtelPathNames::known_paths(["/payment/{paymentId}/authorization-flow"])?)
   .send()
   .await?;

Implementations

impl OtelPathNames

pub fn known_paths<Paths, Path>(paths: Paths) -> Result<Self>

where Paths: IntoIterator<Item = Path>, Path: Into<String>,

Create a new OtelPathNames from a set of known paths.

Paths in this set will be found with find.

Paths can have different parameters:

• Named parameters like :paymentId match anything until the next / or the end of the path.
• Catch-all parameters start with * and match everything after the /. They must be at the end of the route.

OtelPathNames::known_paths([
    "/",
    "/payment",
    "/payment/{paymentId}",
    "/payment/{paymentId}/*action",
]).unwrap();

pub fn find(&self, path: &str) -> Option<&str>

Find the templated path from the actual path.

Returns the templated path if a match is found.

let path_names = OtelPathNames::known_paths(["/payment/{paymentId}"]).unwrap();
let path = path_names.find("/payment/payment-id-123");
assert_eq!(path, Some("/payment/{paymentId}"));

Trait Implementations

impl Clone for OtelPathNames

fn clone(&self) -> OtelPathNames

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.