@opentelemetry/core
Version:
OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.
76 lines • 3 kB
JavaScript
;
/*
* Copyright The OpenTelemetry Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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;
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