JezK
Edit File: event-log.js
/* * A simple example showing piping event traces to a 'events.log' file. * * Usage: * $ node event-log.js * hi * bye * $ cat events.log * [{"ts":213699797444,"pid":42628,"tid":42628,"ph":"b","cat":"default","args":{},"name":"doSomething","id":"abc"}, * {"ts":213700798563,"pid":42628,"tid":42628,"ph":"e","cat":"default","args":{},"name":"doSomething","id":"abc"}, */ var fs = require("fs"); var evt = new (require("../dist/trace-event")).Tracer(); evt.pipe(fs.createWriteStream("events.log")); console.log('Streaming events to "events.log"'); // Instrument code with evt.{begin|instant|end} calls. function doSomething(cb) { evt.begin({ name: "doSomething", id: "abc" }); // Takes 1s to do all this processing for "something". setTimeout(function() { evt.end({ name: "doSomething", id: "abc" }); cb(); }, 1000); } console.log("hi"); doSomething(function() { console.log("bye"); });