firewatch/lib/index.js

Firefox OS memory watch

#!/usr/bin/env node

var clivas = require('clivas');
var exec = require('child_process').exec;

var opts = require('nomnom')
	.option('app', {
		abbr: 'a',
		help: 'Filter list to one app (regexp format)'
	})
	.option('throttle', {
		abbr: 't',
		default: 0,
		help: 'Throttling b2g-info polling'
	})
	.parse();

var filter = null;
if (opts.app) {
	filter = new RegExp(opts.app, 'i');
}

var Snapshot = require('./snapshot');

var device = null;

clivas.cursor(false);

function watch(done) {
	if (!device) {
		exec('adb devices', function(err, stdout, strerr) {
			var devices = stdout.split('\n').slice(1).filter(function(line, idx) {
				return line.trim() != '' && /\w+\t\w+/.test(line);
			}).map(function(line) {
				return line.split(/[\s]+/);
			});
			if (!devices.length) {
				done();
				return;
			}
			clivas.clear();
			device = devices[0][0];
			done();
		});
		return;
	}

	var started = Date.now();
	exec('adb shell b2g-info', function(err, stdout, strerr) {
		if (err) {
			done('disconnected');
			return;
		}
		if (stdout.toString().indexOf('b2g-info: not found') > -1) {
			clivas.clear();
			clivas.line('{red:device "' + device + '" doesn\'t have b2g-info}');
			done();
			return;
		}

		var lag = Date.now() - started;
		var snapshot = new Snapshot(stdout);
		var running = Object.keys(snapshot.apps).length;

		if (running == 0) {
			done('empty snapshot');
			return;
		}

		clivas.clear();
		clivas.line('{yellow:{11:device:}} ' + device + ' {italic:(' + lag + ' ms)}');
		clivas.line('{yellow:{11:free (mb):}} {bold:{8:' +
			(snapshot.mem.free || '-') + '}}');
		clivas.line('{yellow:{11:cache (mb):}} {bold:{8:' +
			(snapshot.mem.cache || '-') + '}}');
		clivas.line('{yellow:{6:pid} {15:app} {8:uss} pss} (mb)');

		Object.keys(snapshot.apps).forEach(function(pid) {
			var app = snapshot.apps[pid];
			if (app.name.charAt(0) == '(') {
				return;
			}
			if (filter && (!filter.test(app.pid) && !filter.test(app.name))) {
				return;
			}
			clivas.line('{6:' + app.pid + '} {15:' + app.name + '} {bold:{8:' +
				app.uss + '} {8:' + app.pss + '}}');
		});

		done();
	});
};

function nextWatch(err) {
	if (err) {
		clivas.line('{red:device "' + device + '"" disconnected}');
		device = null;
	}
	var bound = watch.bind(null, nextWatch);
	if (!opts.throttle) {
		process.nextTick(bound);
	} else {
		setTimeout(bound, opts.throttle);
	}
};

clivas.line('{yellow:waiting for device}');

watch(nextWatch);