background.js

var uploader = require('./lib/flash');

// when the webpage sends a message and we receive it, pass on the info to the uploader and request a flash to the device.
chrome.runtime.onConnectExternal.addListener(function(port) {
	port.onMessage.addListener(function(msg) {
		// call flash process
		uploader.flash(msg.board, msg.port, msg.file, function(error) {
			// prepare the response object
			var message = error ? {error: error.message} : {success: true};
			// send back the status of the flash to the webpage so it knows when it's done/errored.
			port.postMessage(message);
		});
	});
});

// Webpage sends normal message to check if extension is installed. Respond to this message.
chrome.runtime.onMessageExternal.addListener(
	(message, sender, sendResponse) => {
		if (message == 'check') {
			sendResponse({
				type: 'success'
			});
			return true;
		} else if (message == 'ports') {
			uploader.listPorts(function(error, ports) {
				var message = error ? {error: error.message} : ports;				
				sendResponse({message});
			});
			return true;		
		}
	}
);