@opentelemetry/core
Version:
OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.
61 lines • 2.29 kB
JavaScript
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
import { propagation } from '@opentelemetry/api';
import { isTracingSuppressed } from '../../trace/suppress-tracing';
import { BAGGAGE_HEADER, BAGGAGE_ITEMS_SEPARATOR, BAGGAGE_MAX_NAME_VALUE_PAIRS, BAGGAGE_MAX_PER_NAME_VALUE_PAIRS, } from '../constants';
import { getKeyPairs, parsePairKeyValue, serializeKeyPairs } from '../utils';
/**
* Propagates {@link Baggage} through Context format propagation.
*
* Based on the Baggage specification:
* https://w3c.github.io/baggage/
*/
export class W3CBaggagePropagator {
inject(context, carrier, setter) {
const baggage = propagation.getBaggage(context);
if (!baggage || isTracingSuppressed(context))
return;
const keyPairs = getKeyPairs(baggage)
.filter((pair) => {
return pair.length <= BAGGAGE_MAX_PER_NAME_VALUE_PAIRS;
})
.slice(0, BAGGAGE_MAX_NAME_VALUE_PAIRS);
const headerValue = serializeKeyPairs(keyPairs);
if (headerValue.length > 0) {
setter.set(carrier, BAGGAGE_HEADER, headerValue);
}
}
extract(context, carrier, getter) {
const headerValue = getter.get(carrier, BAGGAGE_HEADER);
const baggageString = Array.isArray(headerValue)
? headerValue.join(BAGGAGE_ITEMS_SEPARATOR)
: headerValue;
if (!baggageString)
return context;
const baggage = {};
if (baggageString.length === 0) {
return context;
}
const pairs = baggageString.split(BAGGAGE_ITEMS_SEPARATOR);
pairs.forEach(entry => {
const keyPair = parsePairKeyValue(entry);
if (keyPair) {
const baggageEntry = { value: keyPair.value };
if (keyPair.metadata) {
baggageEntry.metadata = keyPair.metadata;
}
baggage[keyPair.key] = baggageEntry;
}
});
if (Object.entries(baggage).length === 0) {
return context;
}
return propagation.setBaggage(context, propagation.createBaggage(baggage));
}
fields() {
return [BAGGAGE_HEADER];
}
}
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