'use strict'
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var fs = require('fs')
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var os = require('os')
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var platformToMethod = {
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aix: 'ps',
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android: 'procfile',
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alpine: 'procfile',
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darwin: 'ps',
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freebsd: 'ps',
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linux: 'procfile',
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netbsd: 'procfile',
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sunos: 'ps',
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win: 'wmic'
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}
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var ps = require('./ps')
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var platform = os.platform()
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if (fs.existsSync('/etc/alpine-release')) {
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platform = 'alpine'
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}
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if (platform.match(/^win/)) {
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platform = 'win'
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}
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var stat
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try {
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stat = require('./' + platformToMethod[platform])
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} catch (err) {}
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/**
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* @callback pidCallback
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* @param {Error} err A possible error.
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* @param {Object} statistics The object containing the statistics.
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*/
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/**
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* Get pid informations.
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* @public
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* @param {Number|Number[]|String|String[]} pids A pid or a list of pids.
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* @param {Object} [options={}] Options object
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* @param {pidCallback} callback Called when the statistics are ready.
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*/
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function get (pids, options, callback) {
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var fn = stat
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if (platform !== 'win' && options.usePs === true) {
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fn = ps
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}
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if (stat === undefined) {
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return callback(new Error(os.platform() + ' is not supported yet, please open an issue (https://github.com/soyuka/pidusage)'))
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}
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var single = false
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if (!Array.isArray(pids)) {
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single = true
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pids = [pids]
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}
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if (pids.length === 0) {
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return callback(new TypeError('You must provide at least one pid'))
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}
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for (var i = 0; i < pids.length; i++) {
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pids[i] = parseInt(pids[i], 10)
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if (isNaN(pids[i]) || pids[i] < 0) {
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return callback(new TypeError('One of the pids provided is invalid'))
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}
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}
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fn(pids, options, function (err, stats) {
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if (err) {
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return callback(err)
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}
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if (single) {
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callback(null, stats[pids[0]])
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} else {
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callback(null, stats)
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}
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})
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}
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module.exports = get
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