siesta-lite/lib/Siesta/Launcher/Runner/WebDriverNodeJS/CanLockXvfbDisplayFile.js

Stress-free JavaScript unit testing and functional testing tool, works in NodeJS and browsers

/*

Siesta 5.6.1
Copyright(c) 2009-2022 Bryntum AB
https://bryntum.com/contact
https://bryntum.com/products/siesta/license

*/
;!function () {

var properLockFile  = require('proper-lockfile')
var fs              = require('fs')

Role('Siesta.Launcher.Runner.WebDriverNodeJS.CanLockXvfbDisplayFile', {

    does : [
        Siesta.Launcher.FileSystem.NodeJS
    ],

    has : {
        displayNumber           : null,

        minDisplayNum           : 99,
        maxDisplayNum           : 599
    },


    methods : {

        getXvfbLockFileName : function (displayNum) {
            var path     = process.env.HOME + '/.xvfb-locks/display-' + displayNum

            this.ensurePathExists(path)

            return path
        },


        lockXvfbFile : function () {
            var me      = this

            return new Promise(function (resolve, reject) {

                for (var i = me.minDisplayNum; i < me.maxDisplayNum; i++) {
                    // avoid opened display
                    if (fs.existsSync("/tmp/.X" + i + "-lock")) continue;

                    try {
                        var release = properLockFile.lockSync(me.getXvfbLockFileName(i), { realpath : false })

                        resolve({
                            displayNum      : i,
                            release         : release
                        })

                        return

                    } catch (e) {
                    }
                }

                reject("Can't acquire Xvfb lock file")
            })
        }
    }
})


}()