82 lines
2.5 KiB
JavaScript
82 lines
2.5 KiB
JavaScript
'use strict';
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const opentelemetry = require('@opentelemetry/core');
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const config = require('./setup');
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/**
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* The trace instance needs to be initialized first, if you want to enable
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* automatic tracing for built-in plugins (HTTP and MySQL in this case).
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*/
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config.setupTracerAndExporters('http-client-service');
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const http = require('http');
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const tracer = opentelemetry.getTracer('example-mysql-http-client');
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/** A function which makes requests and handles response. */
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function makeRequest() {
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// span corresponds to outgoing requests. Here, we have manually created
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// the span, which is created to track work that happens outside of the
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// request lifecycle entirely.
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const span = tracer.startSpan('makeRequest');
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let queries = 0
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let responses = 0;
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tracer.withSpan(span, () => {
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queries += 1;
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http.get({
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host: 'localhost',
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port: 8080,
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path: '/connection/query'
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}, (response) => {
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let body = [];
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response.on('data', chunk => body.push(chunk));
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response.on('end', () => {
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responses += 1;
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console.log(body.toString());
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if (responses === queries) span.end();
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});
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});
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});
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tracer.withSpan(span, () => {
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queries += 1;
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http.get({
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host: 'localhost',
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port: 8080,
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path: '/pool/query'
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}, (response) => {
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let body = [];
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response.on('data', chunk => body.push(chunk));
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response.on('end', () => {
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responses += 1;
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console.log(body.toString());
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if (responses === queries) span.end();
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});
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});
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});
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tracer.withSpan(span, () => {
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queries += 1;
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http.get({
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host: 'localhost',
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port: 8080,
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path: '/cluster/query'
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}, (response) => {
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let body = [];
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response.on('data', chunk => body.push(chunk));
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response.on('end', () => {
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responses += 1;
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console.log(body.toString());
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if (responses === queries) span.end();
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});
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});
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});
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// The process must live for at least the interval past any traces that
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// must be exported, or some risk being lost if they are recorded after the
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// last export.
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console.log('Sleeping 5 seconds before shutdown to ensure all records are flushed.')
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setTimeout(() => { console.log('Completed.'); }, 5000);
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}
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makeRequest();
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