@opentelemetry/core
Version:
OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.
71 lines • 2.62 kB
JavaScript
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
import { diag } from '@opentelemetry/api';
/** Combines multiple propagators into a single propagator. */
export class CompositePropagator {
_propagators;
_fields;
/**
* Construct a composite propagator from a list of propagators.
*
* @param [config] Configuration object for composite propagator
*/
constructor(config = {}) {
this._propagators = config.propagators ?? [];
const fields = new Set();
for (const propagator of this._propagators) {
// older propagators may not have fields function, null check to be sure
const propagatorFields = typeof propagator.fields === 'function' ? propagator.fields() : [];
for (const field of propagatorFields) {
fields.add(field);
}
}
this._fields = Array.from(fields);
}
/**
* Run each of the configured propagators with the given context and carrier.
* Propagators are run in the order they are configured, so if multiple
* propagators write the same carrier key, the propagator later in the list
* will "win".
*
* @param context Context to inject
* @param carrier Carrier into which context will be injected
*/
inject(context, carrier, setter) {
for (const propagator of this._propagators) {
try {
propagator.inject(context, carrier, setter);
}
catch (err) {
diag.warn(`Failed to inject with ${propagator.constructor.name}. Err: ${err.message}`);
}
}
}
/**
* Run each of the configured propagators with the given context and carrier.
* Propagators are run in the order they are configured, so if multiple
* propagators write the same context key, the propagator later in the list
* will "win".
*
* @param context Context to add values to
* @param carrier Carrier from which to extract context
*/
extract(context, carrier, getter) {
return this._propagators.reduce((ctx, propagator) => {
try {
return propagator.extract(ctx, carrier, getter);
}
catch (err) {
diag.warn(`Failed to extract with ${propagator.constructor.name}. Err: ${err.message}`);
}
return ctx;
}, context);
}
fields() {
// return a new array so our fields cannot be modified
return this._fields.slice();
}
}
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