child-process.js
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var child_process = require('child_process');
var util = require('util');
var events = require('events');
var Logger = require('../../util/logger.js');
function ChildProcess(environment, index, env_output, settings, args) {
events.EventEmitter.call(this);
this.env_output = env_output || [];
this.mainModule = process.mainModule.filename;
this.index = index;
this.itemKey = this.getChildProcessEnvKey(environment);
this.startDelay = settings.parallel_process_delay || ChildProcess.defaultStartDelay;
this.environment = environment;
this.settings = settings;
this.child = null;
this.globalExitCode = 0;
this.processRunning = false;
this.env_label = '';
this.args = args || [];
}
util.inherits(ChildProcess, events.EventEmitter);
ChildProcess.prevIndex = 0;
ChildProcess.defaultStartDelay = 10;
ChildProcess.prototype.setLabel = function(label) {
this.env_itemKey = label;
this.env_label = this.settings.disable_colors ?
(' ' + label + ' ') : Logger.colors.yellow(' ' + label + ' ', Logger.colors.background.black);
return this;
};
ChildProcess.prototype.run = function(colors, done) {
this.availColors = colors;
var cliArgs = this.getArgs();
var env = {};
Object.keys(process.env).forEach(function(key) {
env[key] = process.env[key];
});
var self = this;
setTimeout(function() {
env.__NIGHTWATCH_PARALLEL_MODE = 1;
env.__NIGHTWATCH_ENV = self.environment;
env.__NIGHTWATCH_ENV_KEY = self.itemKey;
env.__NIGHTWATCH_ENV_LABEL = self.env_itemKey;
self.child = child_process.spawn(process.execPath, cliArgs, {
cwd: process.cwd(),
encoding: 'utf8',
env: env,
stdio: [null, null, null, 'ipc']
});
self.child.on('message', function(data) {
self.emit('result', JSON.parse(data));
});
self.processRunning = true;
if (self.settings.output) {
console.log('Started child process for:' + self.env_label);
}
self.child.stdout.on('data', function (data) {
self.writeToStdout(data);
});
self.child.stderr.on('data', function (data) {
self.writeToStdout(data);
});
self.child.on('exit', function (code) {
if (self.settings.output) {
console.log('\n >>' + self.env_label + 'finished. ', '\n');
}
if (code) {
self.globalExitCode = 2;
}
self.processRunning = false;
done(self.env_output, code);
});
}, this.index * this.startDelay);
};
ChildProcess.prototype.getChildProcessEnvKey = function(env) {
return env + '_' + (this.index+1);
};
/**
* Returns an array of cli arguments to be passed to the child process,
* based on the args passed to the main process
* @returns {Array}
*/
ChildProcess.prototype.getArgs = function() {
var args = [this.mainModule];
args.push.apply(args, this.args);
args.push('--parallel-mode');
return args;
};
ChildProcess.prototype.writeToStdout = function(data) {
data = data.toString().trim();
var color_pair = this.availColors[this.index%4];
var output = '';
if (ChildProcess.prevIndex !== this.index) {
ChildProcess.prevIndex = this.index;
if (this.settings.live_output) {
output += '\n';
}
}
if (this.settings.output) {
if (this.settings.disable_colors) {
output += ' ' + this.environment + ' ';
} else {
output += Logger.colors[color_pair[1]](' ' + this.environment + ' ',
Logger.colors.background[color_pair[0]]);
}
output += ' ';
}
output += data;
if (this.settings.live_output) {
process.stdout.write(output + '\n');
} else {
this.env_output.push(output);
}
};
module.exports = ChildProcess;