@opentelemetry/core
Version:
OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.
65 lines • 2.48 kB
JavaScript
;
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.W3CBaggagePropagator = void 0;
const api_1 = require("@opentelemetry/api");
const suppress_tracing_1 = require("../../trace/suppress-tracing");
const constants_1 = require("../constants");
const utils_1 = require("../utils");
/**
* Propagates {@link Baggage} through Context format propagation.
*
* Based on the Baggage specification:
* https://w3c.github.io/baggage/
*/
class W3CBaggagePropagator {
inject(context, carrier, setter) {
const baggage = api_1.propagation.getBaggage(context);
if (!baggage || (0, suppress_tracing_1.isTracingSuppressed)(context))
return;
const keyPairs = (0, utils_1.getKeyPairs)(baggage)
.filter((pair) => {
return pair.length <= constants_1.BAGGAGE_MAX_PER_NAME_VALUE_PAIRS;
})
.slice(0, constants_1.BAGGAGE_MAX_NAME_VALUE_PAIRS);
const headerValue = (0, utils_1.serializeKeyPairs)(keyPairs);
if (headerValue.length > 0) {
setter.set(carrier, constants_1.BAGGAGE_HEADER, headerValue);
}
}
extract(context, carrier, getter) {
const headerValue = getter.get(carrier, constants_1.BAGGAGE_HEADER);
const baggageString = Array.isArray(headerValue)
? headerValue.join(constants_1.BAGGAGE_ITEMS_SEPARATOR)
: headerValue;
if (!baggageString)
return context;
const baggage = {};
if (baggageString.length === 0) {
return context;
}
const pairs = baggageString.split(constants_1.BAGGAGE_ITEMS_SEPARATOR);
pairs.forEach(entry => {
const keyPair = (0, utils_1.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 api_1.propagation.setBaggage(context, api_1.propagation.createBaggage(baggage));
}
fields() {
return [constants_1.BAGGAGE_HEADER];
}
}
exports.W3CBaggagePropagator = W3CBaggagePropagator;
//# sourceMappingURL=W3CBaggagePropagator.js.map