rgarcia/domain-errors.js

## domain-errors.js
var util = require("util");
var domain = require("domain");
var express = require("express");

var defaultErrHandler = express.errorHandler();

module.exports = function totallyUseless(error, req, res, next) {
  console.error("in error handler", error.stack)
  if (domain.active) {
    domain.active.emit("error", error);
  } else {
    defaultErrHandler(error, req, res, next);
  }
};

## server.js
"use strict";

var http         = require("http");
var domain       = require("domain");
var path         = require("path");
var express      = require("express");
var domainErrors = require("./domain-errors.js");

function databaseCall() {
  throw new Error("oh no the database exploded");
}

var app = express();

app.set("port", process.env.PORT || 1337);
app.set("views", __dirname + "/views");
app.set("view engine", "jade");
app.enable('verbose errors');
app.use(express.favicon());
app.use(express.logger("dev"));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, "public")));
app.use(domainErrors);

app.get("/", function (req, res) {
  res.render("index", {title : "Express"});
});

app.get("/throw", function (req, res) {
  void res; // shut up, jshint
  throw new Error("Imagine I'm deeper in the code");
});

app.get("/database", function (req, res, next) {
  setTimeout(function () {
    databaseCall();
    next();
  }, 500);
});

// route-specific domains for errors we can intercept and not crash on
app.get("/handle", function (req, res) {
  var subDomain = domain.create();
  subDomain.on("error", function (error) {
    res.send(500, "<html><head><title>whoops</title></head><body>" +
             "<p>Got error: '" + error.message + "'. Ignoring.</p>" +
             "</body></html>");
  });

  subDomain.run(databaseCall);
});

// maindomain is for "unknown" errors, just bail

var mainDomain = domain.create();
mainDomain.on("error", function (error) {
  console.error("caught %s in main domain, shutting down", error.message);
  process.exit(1);
});

mainDomain.run(function () {
  http.createServer(app).listen(app.get("port"), function () {
    console.log("Express server listening on port " + app.get("port"));
  });
});
	var util = require("util");
	var domain = require("domain");
	var express = require("express");

	var defaultErrHandler = express.errorHandler();

	module.exports = function totallyUseless(error, req, res, next) {
	console.error("in error handler", error.stack)
	if (domain.active) {
	domain.active.emit("error", error);
	} else {
	defaultErrHandler(error, req, res, next);
	}
	};
	"use strict";

	var http = require("http");
	var domain = require("domain");
	var path = require("path");
	var express = require("express");
	var domainErrors = require("./domain-errors.js");

	function databaseCall() {
	throw new Error("oh no the database exploded");
	}

	var app = express();

	app.set("port", process.env.PORT \|\| 1337);
	app.set("views", __dirname + "/views");
	app.set("view engine", "jade");
	app.enable('verbose errors');
	app.use(express.favicon());
	app.use(express.logger("dev"));
	app.use(express.bodyParser());
	app.use(express.methodOverride());
	app.use(app.router);
	app.use(express.static(path.join(__dirname, "public")));
	app.use(domainErrors);

	app.get("/", function (req, res) {
	res.render("index", {title : "Express"});
	});

	app.get("/throw", function (req, res) {
	void res; // shut up, jshint
	throw new Error("Imagine I'm deeper in the code");
	});

	app.get("/database", function (req, res, next) {
	setTimeout(function () {
	databaseCall();
	next();
	}, 500);
	});

	// route-specific domains for errors we can intercept and not crash on
	app.get("/handle", function (req, res) {
	var subDomain = domain.create();
	subDomain.on("error", function (error) {
	res.send(500, "<html><head><title>whoops</title></head><body>" +
	"<p>Got error: '" + error.message + "'. Ignoring.</p>" +
	"</body></html>");
	});

	subDomain.run(databaseCall);
	});

	// maindomain is for "unknown" errors, just bail

	var mainDomain = domain.create();
	mainDomain.on("error", function (error) {
	console.error("caught %s in main domain, shutting down", error.message);
	process.exit(1);
	});

	mainDomain.run(function () {
	http.createServer(app).listen(app.get("port"), function () {
	console.log("Express server listening on port " + app.get("port"));
	});
	});