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http.js
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http.js
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/*!
* Connect - HTTPServer
* Copyright(c) 2010 Sencha Inc.
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Module dependencies.
*/
var http = require('http')
, parse = require('url').parse
, assert = require('assert')
, utils = require('./utils');
// environment
var env = process.env.NODE_ENV || 'development';
/**
* Initialize a new `Server` with the given `middleware`.
*
* Examples:
*
* var server = connect.createServer(
* connect.favicon()
* , connect.logger()
* , connect.static(__dirname + '/public')
* );
*
* @params {Array} middleware
* @return {Server}
* @api public
*/
var Server = exports.Server = function HTTPServer(middleware) {
this.stack = [];
middleware.forEach(function(fn){
this.use(fn);
}, this);
http.Server.call(this, this.handle);
};
/**
* Inherit from `http.Server.prototype`.
*/
Server.prototype.__proto__ = http.Server.prototype;
/**
* Utilize the given middleware `handle` to the given `route`,
* defaulting to _/_. This "route" is the mount-point for the
* middleware, when given a value other than _/_ the middleware
* is only effective when that segment is present in the request's
* pathname.
*
* For example if we were to mount a function at _/admin_, it would
* be invoked on _/admin_, and _/admin/settings_, however it would
* not be invoked for _/_, or _/posts_.
*
* This is effectively the same as passing middleware to `connect.createServer()`,
* however provides a progressive api.
*
* Examples:
*
* var server = connect.createServer();
* server.use(connect.favicon());
* server.use(connect.logger());
* server.use(connect.static(__dirname + '/public'));
*
* If we wanted to prefix static files with _/public_, we could
* "mount" the `static()` middleware:
*
* server.use('/public', connect.static(__dirname + '/public'));
*
* This api is chainable, meaning the following is valid:
*
* connect.createServer()
* .use(connect.favicon())
* .use(connect.logger())
* .use(connect.static(__dirname + '/public'))
* .listen(3000);
*
* @param {String|Function} route or handle
* @param {Function} handle
* @return {Server}
* @api public
*/
Server.prototype.use = function(route, handle){
this.route = '/';
// default route to '/'
if ('string' != typeof route) {
handle = route;
route = '/';
}
// wrap sub-apps
if ('function' == typeof handle.handle) {
var server = handle;
server.route = route;
handle = function(req, res, next) {
server.handle(req, res, next);
};
}
// wrap vanilla http.Servers
if (handle instanceof http.Server) {
handle = handle.listeners('request')[0];
}
// normalize route to not trail with slash
if ('/' == route[route.length - 1]) {
route = route.substr(0, route.length - 1);
}
// add the middleware
this.stack.push({ route: route, handle: handle });
// allow chaining
return this;
};
/**
* Handle server requests, punting them down
* the middleware stack.
*
* @api private
*/
Server.prototype.handle = function(req, res, out) {
var writeHead = res.writeHead
, stack = this.stack
, removed = ''
, index = 0;
function next(err) {
var layer, path, c;
req.url = removed + req.url;
req.originalUrl = req.originalUrl || req.url;
removed = '';
layer = stack[index++];
// all done
if (!layer || res.headerSent) {
// but wait! we have a parent
if (out) return out(err);
// error
if (err) {
var msg = 'production' == env
? 'Internal Server Error'
: err.stack || err.toString();
// output to stderr in a non-test env
if ('test' != env) console.error(err.stack || err.toString());
// unable to respond
if (res.headerSent) return req.socket.destroy();
res.statusCode = 500;
res.setHeader('Content-Type', 'text/plain');
if ('HEAD' == req.method) return res.end();
res.end(msg);
} else {
res.statusCode = 404;
res.setHeader('Content-Type', 'text/plain');
if ('HEAD' == req.method) return res.end();
res.end('Cannot ' + req.method + ' ' + utils.escape(req.originalUrl));
}
return;
}
try {
path = parse(req.url).pathname;
if (undefined == path) path = '/';
// skip this layer if the route doesn't match.
if (0 != path.indexOf(layer.route)) return next(err);
c = path[layer.route.length];
if (c && '/' != c && '.' != c) return next(err);
// Call the layer handler
// Trim off the part of the url that matches the route
removed = layer.route;
req.url = req.url.substr(removed.length);
// Ensure leading slash
if ('/' != req.url[0]) req.url = '/' + req.url;
var arity = layer.handle.length;
if (err) {
if (arity === 4) {
layer.handle(err, req, res, next);
} else {
next(err);
}
} else if (arity < 4) {
layer.handle(req, res, next);
} else {
next();
}
} catch (e) {
if (e instanceof assert.AssertionError) {
console.error(e.stack + '\n');
next(e);
} else {
next(e);
}
}
}
next();
};