Module propagation 

Propagation of OpenTelemetry trace context across RPC boundaries. OpenTelemetry context propagation for gRPC.

This module provides utilities for propagating OpenTelemetry context (trace context and baggage) across gRPC service boundaries using tonic metadata.

Usage

Client-side injection

use linera_rpc::propagation::inject_context;
use opentelemetry::Context;

let mut request = tonic::Request::new(payload);
inject_context(&Context::current(), request.metadata_mut());

Server-side extraction

use linera_rpc::propagation::extract_context;

let cx = extract_context(request.metadata());
// Use cx.with_baggage() to access baggage values

Structs

ExtractedOtelContext

Extension type to store the extracted OpenTelemetry context.

OtelContextLayer

Tower layer that extracts OpenTelemetry context from incoming gRPC requests.

OtelContextService

Service wrapper that extracts OpenTelemetry context from requests.

Constants

TRAFFIC_TYPE_ENV_VAR

Environment variable to override the traffic type.

TRAFFIC_TYPE_KEY

Baggage key for traffic type labeling.

TRAFFIC_TYPE_ORGANIC

Traffic type for normal production traffic.

TRAFFIC_TYPE_SYNTHETIC

Traffic type for synthetic benchmark traffic.

TRAFFIC_TYPE_UNKNOWN

Traffic type when OpenTelemetry feature is disabled.

Traits

HasOtelContext

Trait for request types that can provide access to extracted OpenTelemetry context.

Functions

create_request_with_context

Creates a new tonic::Request with the OpenTelemetry context injected into metadata.

create_request_with_current_span_context

Creates a new tonic::Request with the current tracing span’s context injected.

extract_context

Extracts the OpenTelemetry context from tonic metadata.

get_context_with_traffic_type

Returns the current OpenTelemetry context, enriched with traffic type baggage if the LINERA_TRAFFIC_TYPE environment variable is set.

get_otel_context_from_tonic_request

Gets the OpenTelemetry context from a tonic::Request’s extensions.

get_traffic_type

Extracts the traffic type from the current context.

get_traffic_type_from_request

Gets the traffic type from a request’s extensions.

inject_context

Injects the OpenTelemetry context into tonic metadata.