Struct OtelTracingLayer 

pub struct OtelTracingLayer<E> { /* private fields */ }

Tower layer that adds OpenTelemetry tracing to Lambda handlers.

This layer wraps a service with tracing instrumentation that:

• Extracts trace context from Lambda events
• Creates spans with semantic attributes following OTel conventions
• Handles cold start detection
• Flushes the tracer provider after each invocation

Type Parameters

• E - The trace context extractor type

Example

use opentelemetry_lambda_tower::{OtelTracingLayer, HttpEventExtractor};
use tower::ServiceBuilder;

let layer = OtelTracingLayer::new(HttpEventExtractor::new());

let service = ServiceBuilder::new()
    .layer(layer)
    .service(my_handler);

Implementations

impl<E> OtelTracingLayer<E>

pub fn new(extractor: E) -> Self

Creates a new tracing layer with the given extractor.

Uses default settings:

• Flush on end: enabled
• Flush timeout: 5 seconds
• No tracer provider (uses global provider)
• No logger provider (logs not flushed)

pub fn builder(extractor: E) -> OtelTracingLayerBuilder<E>

Creates a builder for more detailed configuration.

Trait Implementations

impl<E: Clone> Clone for OtelTracingLayer<E>

fn clone(&self) -> OtelTracingLayer<E>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S, E> Layer<S> for OtelTracingLayer<E>

where E: Clone,

type Service = OtelTracingService<S, E>

The wrapped service

fn layer(&self, inner: S) -> Self::Service

Wrap the given service with the middleware, returning a new service that has been decorated with the middleware.