woba-consola/web/target.js

(function() {

var id = document.currentScript.src.split("?")[1];
var state = "connecting"

var conn = new WebSocket(
	location.protocol.replace("http", "ws") + "//" +
	location.host);

function toString(val) {
	if (typeof val == "string" || typeof val == "function")
		return val.toString();

	try {
		return JSON.stringify(val);
	} catch (err) {
		return val.toString();
	}
}

var logq = [];

function sendLog() {
	var str = "";
	for (var i in arguments) {
		if (i != 0)
			str += " ";
		str += toString(arguments[i]);
	}

	if (state == "ready")
		conn.send(JSON.stringify({ type: "log", log: str }));
	else
		logq.push(str);
}

conn.onmessage = function(msg) {
	var obj;
	try {
		obj = JSON.parse(msg.data);
	} catch (err) {
		alert("Woba Consola: Failed to parse JSON '" + msg.data + "'");
		return;
	}

	switch (obj.type) {
	case "identify-response":
		if (obj.err != null) {
			alert("Woba Consola: Error: " + obj.err);
			state = "error";
		} else {
			state = "waiting-for-master";
		}
		break;

	case "master-connect":
		state = "ready";

		for (var i in logq)
			conn.send(JSON.stringify({ type: "log", log: logq[i] }));
		logq = [];
		break;

	case "master-disconnect":
		state = "waiting-for-master";
		break;

	case "run-js":
		var res;
		try {
			res = toString(eval(obj.js));
		} catch (err) {
			conn.send(JSON.stringify({
				type: "js-result",
				err: err.toString(),
			}));
			return;
		}

		conn.send(JSON.stringify({
			type: "js-result",
			result: res,
		}));
		break;

	case "ping":
		conn.send(JSON.stringify({ type: "pong" }));
		break;

	default:
		alert("Woba Consola: Unknown message type: " + obj.type);
	}
};

conn.onopen = function() {
	state = "identifying";
	conn.send(JSON.stringify({ type: "identify-target", id: id }));
};

conn.onclose = function(evt) {
	state = "closed";
	alert("Woba Consola: Connction closed (" + evt.code + ")");
};

var origCons = console;
var newCons = {};

function logProxy(name) {
	return function() {
		var arr = Array.prototype.slice.call(arguments);
		origCons[name].apply(origCons, arr);
		arr.unshift(name + ":");
		sendLog.apply(null, arr);
	}
}

for (var i in origCons) {
	if (origCons.hasOwnProperty(i)) {
		newCons[i] = logProxy(i);
	}
}

window.addEventListener("error", function(evt) {
	sendLog("error: " + evt.filename + " : " + evt.lineno + ":", evt.message);
});

window.console = newCons;

})();