Current File : //usr/lib/node_modules/pm2/node_modules/@opencensus/propagation-b3/build/src/b3-format.js
"use strict";
/**
* Copyright 2018, OpenCensus 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
*
* http://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 });
const crypto = require("crypto");
const uuid = require("uuid");
const X_B3_TRACE_ID = 'x-b3-traceid';
const X_B3_SPAN_ID = 'x-b3-spanid';
const X_B3_PARENT_SPAN_ID = 'x-x3-parentspanid';
const X_B3_SAMPLED = 'x-b3-sampled';
const SAMPLED_VALUE = 0x1;
const NOT_SAMPLED_VALUE = 0x0;
/** Propagates span context through B3 Format propagation. */
class B3Format {
/**
* Gets the trace context from a request headers. If there is no trace context
* in the headers, null is returned.
* @param getter
*/
extract(getter) {
if (getter) {
let opt = getter.getHeader(X_B3_SAMPLED);
if (opt instanceof Array) {
opt = opt[0];
}
const spanContext = {
traceId: getter.getHeader(X_B3_TRACE_ID),
spanId: getter.getHeader(X_B3_SPAN_ID),
options: isNaN(Number(opt)) ? undefined : Number(opt)
};
return spanContext;
}
return null;
}
/**
* Adds a trace context in a request headers.
* @param setter
* @param spanContext
*/
inject(setter, spanContext) {
if (setter) {
setter.setHeader(X_B3_TRACE_ID, spanContext.traceId || 'undefined');
setter.setHeader(X_B3_SPAN_ID, spanContext.spanId || 'undefined');
if (spanContext && (spanContext.options & SAMPLED_VALUE) !== 0) {
setter.setHeader(X_B3_SAMPLED, `${SAMPLED_VALUE}`);
}
else {
setter.setHeader(X_B3_SAMPLED, `${NOT_SAMPLED_VALUE}`);
}
}
}
/**
* Generate SpanContexts
*/
generate() {
return {
traceId: uuid.v4().split('-').join(''),
spanId: crypto.randomBytes(8).toString('hex'),
options: SAMPLED_VALUE
};
}
}
exports.B3Format = B3Format;
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