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controls.js
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controls.js
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/*global require, process, console */
// Example with some advanced usage:
// advanced configuration
// error callbacks
// scpOptions
// config task command line arguments rewriting
// custom listeners
// stdin writing
//
// Uses localhost as a 'remote' machine and this script recursively to simulate
// exit code returns, stderr and stout output, and stdin reading on the
// 'remote' machine.
// Run like:
// node controls.js myhost test 0
// node controls.js myhost test 64
// node controls.js mycluster test 0
// node controls.js mycluster test 64
// node controls.js mycluster scp
// node controls.js mycluster clean
// node controls.js myhost listeners
// node controls.js myhost stdin
// node controls.js myclusterarray test 0
// node controls.js myclusterjson test 0
// node controls.js mymachine 127.0.0.1 test 0
var control = require('../'),
task = control.task,
script = process.argv[1],
scpTest = 'controlScpTest';
task('mycluster', 'Prototype config for cluster of two', function () {
var controllers = [],
local, controller;
local = Object.create(control.controller);
// Tags to demonstrate chaining prototype usage
local.user = process.env.USER;
local.tags = ['local'];
controller = Object.create(local);
controller.address = 'localhost';
controller.scpOptions = ['-v'];
controller.tags = controller.tags.concat(['dns']);
controllers.push(controller);
controller = Object.create(local);
controller.address = '127.0.0.1';
controller.tags = controller.tags.concat(['ip']);
controllers.push(controller);
return controllers;
});
task('myclusterarray', 'Array config for cluster of two', function () {
var controller = Object.create(control.controller);
controller.user = process.env.USER;
controller.scpOptions = ['-v'];
return control.controllers(['localhost', '127.0.0.1'], controller);
});
task('myclusterjson', 'JSON Config for my cluster of two', function () {
// Demonstrates JSON configuration usage
var addresses = {
'localhost': {
user: process.env.USER,
scpOptions: ['-v'],
tags: ['local', 'dns']
},
'127.0.0.1': {
user: process.env.USER,
tags: ['local', 'ip']
}
};
return control.controllers(addresses);
});
function configure(address) {
var controller = Object.create(control.controller);
controller.user = process.env.USER;
controller.scpOptions = ['-v'];
controller.address = address;
return [controller];
}
task('myhost', 'Config for cluster of one', function () {
return configure('localhost');
});
task('mymachine', 'Config for single host from command line', function (args) {
return configure([args.shift()]); // From command line arguments rewriting
});
// note that many sshd configs default to a low number of allowed connections
// run like: node controls.js many 5 test
task('many', 'Config n controllers', function (args) {
var controllers = [], shared, controller, i, l = args.shift();
shared = Object.create(control.controller);
shared.user = process.env.USER;
for (i = 0; i < l; i += 1) {
controller = Object.create(shared);
controller.address = 'localhost';
controllers.push(controller);
}
return controllers;
});
function doTest(controller, code, callback, exitCallback) {
code = code || 0;
controller.ssh('node ' + script + ' myhost arbexit ' + code,
callback, exitCallback);
}
// Task to perform 'remote' call requesting 'remote' to exit arbitrarily
task('test', 'Test task', function (controller, code) {
if (controller.tags) {
console.log(' Tags for ' + controller.address + ' are: ' +
controller.tags);
}
function callback() {
console.log(' Regular callback activated for ' + controller.address);
}
function exitCallback(exit) {
console.log(' Exit callback activated for ' + controller.address +
' with exit code ' + exit);
}
doTest(controller, code, callback, exitCallback);
});
// Task that will run on 'remote' to exit with an arbitrary code
task('arbexit', 'Arbitrary exit', function (controller, code) {
code = code || 0;
console.log(' (stdout) Exiting with code ' + code);
console.error(' (stderr) Exiting with code ' + code);
process.exit(code);
});
task('scp', 'Test scp options', function (controller) {
controller.scp(script, scpTest);
});
task('clean', 'Remove file transferred in scp testing', function (controller) {
controller.ssh('rm ' + scpTest);
});
task('listeners', 'Custom listener example', function (controller) {
var stdout, stderr;
controller.stdout.on('data', function (data) {
console.log(' Custom stdout listerner called for ' +
controller.address);
stdout = stdout || '';
stdout = stdout += data.toString();
});
controller.stderr.on('data', function (data) {
console.log(' Custom stderr listerner called for ' +
controller.address);
stderr = stderr || '';
stderr = stderr += data.toString();
});
doTest(controller, 0, function () {
console.log(' Response gathered by custom stdout listener for ' +
controller.id() + ': \n' + stdout);
console.log(' Response gatehered by custom stderr listener for ' +
controller.id() + ': \n' + stderr);
doTest(controller, 0); // Custom listeners are now cleared
});
});
task('echo', 'Stdin to stdout echo until "end"', function (controller) {
console.log('Enter data to echo ("end" to stop echoing): ');
process.stdin.resume();
process.stdin.on('data', function (chunk) {
process.stdout.write(chunk);
chunk = chunk.toString();
if (chunk.match('end')) {
process.stdin.pause();
}
});
});
task('stdin', 'Test controller stdin usage', function (controller) {
var stdout;
controller.stdout.on('data', function (chunk) {
chunk = chunk.toString();
if (chunk.match('^Enter data')) {
controller.stdin.write('hello\n');
controller.stdin.write('end');
}
});
controller.ssh('node ' + script + ' myhost echo');
});
task('ondate', 'Different logic paths based on date', function (controller) {
var datestring = '';
controller.stdout.on('data', function (chunk) {
datestring += chunk.toString();
});
controller.ssh('date', function () {
console.log(' Date string is ' + datestring);
// Further logic dependent on value of datestring
});
});
task('logchange', 'Call date two times, changing log path before second call',
function (controller) {
controller.ssh('date', function () {
controller.logPath = 'alt.log';
controller.ssh('date -r 1');
});
});
control.begin();