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test-trace-options.ts
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// Copyright 2015 Google LLC
//
// 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.
// eslint-disable-next-line @typescript-eslint/no-var-requires
const common = require('./plugins/common' /*.js*/);
import * as assert from 'assert';
import * as http from 'http';
import {describe, it, before} from 'mocha';
describe('express + http with trace options header', () => {
let agent;
let express;
before(() => {
agent = require('../..').start({
projectId: '0',
samplingRate: 0,
});
express = require('express');
});
it('should trace when enabled', done => {
const app = express();
app.get('/', (req, res) => {
setTimeout(() => {
res.send('Hello World');
}, 50);
});
const server = app.listen(common.serverPort, () => {
const shouldTraceOptions = [1, 3, 5, 7];
const shouldNotTraceOptions = [0, 2, 4, 6];
sendRequests(agent, shouldTraceOptions, shouldTraceOptions.length, () => {
sendRequests(agent, shouldNotTraceOptions, 0, () => {
server.close();
done();
});
});
});
});
});
function sendRequests(agent, options, expectedTraceCount, done) {
let doneCount = 0;
options.forEach(option => {
const headers = {};
headers['x-cloud-trace-context'] = '42/1729;o=' + option;
http.get({port: common.serverPort, headers: headers}, res => {
res.on('data', () => {});
res.on('end', () => {
if (++doneCount === options.length) {
assert.strictEqual(common.getTraces().length, expectedTraceCount);
common.cleanTraces();
done();
}
});
});
});
}
export default {};