Demonstrates how to fork a process within an express server in response to a valid command.

process-attack-with-fork.js

/**
 * Processes an authorized admin's attack request and launches the attack
 *
 * Handles tracking the attack child process at the app-level so it can be referenced later / stopped
 * 
 * @param  {String} requesting_admin - The phone number of the requesting admin
 * @param  {String} target - The phone number of the target to be attacked
 * 
 * @return void
 */
handleAdminAttackRequest = function(requesting_admin, target) {
	//Ensure target is not already being attacked (we have some degree of decency - no?)
	if (!isTargetBeingAttacked(target)) {
		//Fork a new attack process - passing the requesting admin's phone number and target phone number as string arguments
		var CatfactsAttack = child_process.fork('./attack.js', [requesting_admin, target]); 
		//Handle messages sent back from child processes
		CatfactsAttack.on('message', function(m){
			switch(m.status){
				case 'invalid_status':
					CatfactsAttack.kill(); 
					//Send invalid target sms back to admin
					sendResponseSMS(m.requesting_admin, 'Oops! ' + target + ' doesn\'t appear to be a valid number. Attack NOT Launched!');
					break; 
				case 'starting_attack': 
					//Tag the attack child_process with its target number
					CatfactsAttack.target_number = m.child_target;					
					//Add child_process to app-level array of current attacks
					beginTrackingAttack(CatfactsAttack); 
					//Send sms confirming attack back to admin
					sendResponseSMS(m.requesting_admin, 'Attack Vector Confirmed: CatFacts Bombardment Underway! - Text: "downboy ' + m.child_target + '" to stop attack.'); 
					break;
				case 'exhausted': 
					//Remove number from app-level array of numbers being attacked
					stopTrackingAttack(m.child_target);
					//Send exhaustion notification sms back to admin 
					sendResponseSMS(m.requesting_admin, 'CatFacts Attack on ' + target + ' ran out of facts! Attack Complete.');  
					CatfactsAttack.kill();
					break;
			}
		}); 
	}
}