@opentelemetry/propagator-b3/build/src/B3Propagator.js

OpenTelemetry B3 propagator provides context propagation for systems that are using the B3 header format

"use strict";
/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.B3Propagator = void 0;
const core_1 = require("@opentelemetry/core");
const B3MultiPropagator_1 = require("./B3MultiPropagator");
const B3SinglePropagator_1 = require("./B3SinglePropagator");
const constants_1 = require("./constants");
const types_1 = require("./types");
/**
 * Propagator that extracts B3 context in both single and multi-header variants,
 * with configurable injection format defaulting to B3 single-header. Due to
 * the asymmetry in injection and extraction formats this is not suitable to
 * be implemented as a composite propagator.
 * Based on: https://github.com/openzipkin/b3-propagation
 */
class B3Propagator {
    _b3MultiPropagator = new B3MultiPropagator_1.B3MultiPropagator();
    _b3SinglePropagator = new B3SinglePropagator_1.B3SinglePropagator();
    _inject;
    _fields;
    constructor(config = {}) {
        if (config.injectEncoding === types_1.B3InjectEncoding.MULTI_HEADER) {
            this._inject = this._b3MultiPropagator.inject;
            this._fields = this._b3MultiPropagator.fields();
        }
        else {
            this._inject = this._b3SinglePropagator.inject;
            this._fields = this._b3SinglePropagator.fields();
        }
    }
    inject(context, carrier, setter) {
        if ((0, core_1.isTracingSuppressed)(context)) {
            return;
        }
        this._inject(context, carrier, setter);
    }
    extract(context, carrier, getter) {
        const header = getter.get(carrier, constants_1.B3_CONTEXT_HEADER);
        const b3Context = Array.isArray(header) ? header[0] : header;
        if (b3Context) {
            return this._b3SinglePropagator.extract(context, carrier, getter);
        }
        else {
            return this._b3MultiPropagator.extract(context, carrier, getter);
        }
    }
    fields() {
        return this._fields;
    }
}
exports.B3Propagator = B3Propagator;
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