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54 lines
1.4 KiB
Plaintext
54 lines
1.4 KiB
Plaintext
/**
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* profiler.js: TODO: add file header description.
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*
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* (C) 2010 Charlie Robbins
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* MIT LICENCE
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*/
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'use strict';
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/**
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* TODO: add class description.
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* @type {Profiler}
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* @private
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*/
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class Profiler {
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/**
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* Constructor function for the Profiler instance used by
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* `Logger.prototype.startTimer`. When done is called the timer will finish
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* and log the duration.
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* @param {!Logger} logger - TODO: add param description.
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* @private
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*/
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constructor(logger) {
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const Logger = require('./logger');
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if (typeof logger !== 'object' || Array.isArray(logger) || !(logger instanceof Logger)) {
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throw new Error('Logger is required for profiling');
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} else {
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this.logger = logger;
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this.start = Date.now();
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}
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}
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/**
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* Ends the current timer (i.e. Profiler) instance and logs the `msg` along
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* with the duration since creation.
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* @returns {mixed} - TODO: add return description.
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* @private
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*/
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done(...args) {
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if (typeof args[args.length - 1] === 'function') {
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// eslint-disable-next-line no-console
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console.warn('Callback function no longer supported as of winston@3.0.0');
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args.pop();
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}
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const info = typeof args[args.length - 1] === 'object' ? args.pop() : {};
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info.level = info.level || 'info';
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info.durationMs = (Date.now()) - this.start;
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return this.logger.write(info);
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}
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};
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module.exports = Profiler;
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