laps/examples/async/app.js

Simple flow-control lib for Node.js: combine sync/async steps, organize your spaghetti-code

var dns = require('dns');
var Laps = require('../../lib');

function testLapsFull(){
    console.log('TEST LAPS FULL');
    new Laps().lap(function() {
        this.exec('host', 'unknown');
        dns.resolve4('unknown.unk', this.cb('resolve', 'unknown'));
        this.exec('host', 'microsoft');
        dns.resolve4('microsoft.com', this.cb('resolve', 'microsoft'));
        this.exec('host', 'google');
        dns.resolve4('google.com', this.cb('resolve', 'google'));   
        setImmediate(this.cb('wait'));
    }).on('start', function() {
        console.log('Start test');
    }).on('begin', function() {
        console.log('Lap started, lap: ' + this.lap());
    }).cmd('wait', function() {
        console.log('Waiting callbacks, lap: ' + this.lap());
    }).cmd('host', function(type) {
        console.log('Start host processing, host: ' + type);
    }).cmd('resolve', function(type, err, addresses) {
        if (err) throw err;
        for (var i = 0; i < addresses.length; i++) {
            var adr = addresses[i];
            dns.reverse(adr, this.cb('reverse', type, adr));            
        };
    }).cmd('reverse', function(type, adr, err, data) {
        if (err) throw err;
        console.log(type + ', reverse for ' + adr + ': ' + JSON.stringify(data));
    }).on('error', function(err) {
        console.log('Error: ' + err.message);
        //this.cancel();
    }).on('end', function() {
        var err = this.err(), errStr = (err) ? (', error: ' + err.message) : ('');
        console.log('Lap ended: ' + this.lap() + errStr);
        //if (err) this.cancel();
    }).on('finish', function() {
        console.log('End test');
    })
    .run()
    .run();
}

function testLaps(){
    console.log('TEST LAPS');
    new Laps().lap(function() {
        dns.resolve4('unknown.unk', this.cb('resolve', 'unknown'));
        dns.resolve4('microsoft.com', this.cb('resolve', 'microsoft'));
        dns.resolve4('google.com', this.cb('resolve', 'google'));
    }).cmd('resolve', function(type, err, addresses) {
        if (err) throw err;
        for (var i = 0; i < addresses.length; i++) {
            var adr = addresses[i];
            dns.reverse(adr, this.cb('reverse', type, adr));            
        };
    }).cmd('reverse', function(type, adr, err, data) {
        if (err) throw err;
        console.log(type + ', reverse for ' + adr + ': ' + JSON.stringify(data));
    }).on('error', function(err) {
        console.log('Error: ' + err.message);
    }).run();
}

function testNode(){
    console.log('TEST NODE');
    var error = function(err) {
        console.log('Error: ' + err.message);
    };
    var reverse = function(type, adr) {
        return function(err, data) {
            if (err) return error(err);
            console.log(type + ', reverse for ' + adr + ': ' + JSON.stringify(data));
        }
    };
    var resolve = function(type) {
        return function(err, addresses) {
            if (err) return error(err);
            for (var i = 0; i < addresses.length; i++) {
                var adr = addresses[i];
                dns.reverse(adr, reverse(type, adr));            
            };
        }
    };
    dns.resolve4('unknown.unk', resolve('unknown'));
    dns.resolve4('microsoft.com', resolve('microsoft'));
    dns.resolve4('google.com', resolve('google'));
}

testLapsFull();
//testLaps();
//testNode();