2013-08-17 07:15:57 +00:00
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/**
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* Module dependencies.
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*/
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var debug = require('debug')('koa:app');
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var Emitter = require('events').EventEmitter;
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var compose = require('koa-compose');
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2013-08-17 22:36:51 +00:00
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var context = require('./context');
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2013-08-17 07:15:57 +00:00
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var Stream = require('stream');
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var http = require('http');
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var co = require('co');
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/**
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* Application prototype.
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*/
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var app = Application.prototype;
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/**
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* Expose `Application`.
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*/
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exports = module.exports = Application;
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/**
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* Initialize a new `Application`.
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*
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* @api public
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*/
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function Application() {
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if (!(this instanceof Application)) return new Application;
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this.env = process.env.NODE_ENV || 'development';
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this.outputErrors = 'development' == this.env;
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this.subdomainOffset = 2;
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this.poweredBy = true;
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this.jsonSpaces = 2;
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this.middleware = [];
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2013-08-18 18:14:01 +00:00
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this.Context = createContext();
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2013-08-17 22:36:51 +00:00
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this.context(context);
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2013-08-17 07:15:57 +00:00
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}
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/**
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* Inherit from `Emitter.prototype`.
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*/
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Application.prototype.__proto__ = Emitter.prototype;
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/**
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* Shorthand for:
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*
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* http.createServer(app.callback()).listen(...)
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*
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* @param {Mixed} ...
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* @return {Server}
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* @api public
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*/
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app.listen = function(){
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var server = http.createServer(this.callback());
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return server.listen.apply(server, arguments);
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};
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/**
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* Use the given middleware `fn`.
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*
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* @param {Function} fn
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* @return {Application} self
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* @api public
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*/
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app.use = function(fn){
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debug('use %s', fn.name || 'unnamed');
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this.middleware.push(fn);
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return this;
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};
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2013-08-17 22:36:51 +00:00
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/**
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2013-08-18 18:15:22 +00:00
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* Mixin `obj` to this app's context.
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2013-08-17 22:36:51 +00:00
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*
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2013-08-18 18:15:22 +00:00
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* app.context({
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* get something(){
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* return 'hi';
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* },
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*
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* set something(val){
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* this._something = val;
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* },
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*
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* render: function(){
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* this.body = '<html></html>';
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* }
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* });
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2013-08-17 22:36:51 +00:00
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*
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* @param {Object} obj
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* @return {Application} self
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* @api public
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*/
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app.context = function(obj){
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2013-08-18 18:14:01 +00:00
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var ctx = this.Context.prototype;
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2013-08-17 22:36:51 +00:00
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Object.getOwnPropertyNames(obj).forEach(function(name){
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var descriptor = Object.getOwnPropertyDescriptor(obj, name);
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Object.defineProperty(ctx, name, descriptor);
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});
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return this;
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};
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2013-08-17 07:15:57 +00:00
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/**
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* Return a request handler callback
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* for node's native htto server.
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*
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* @return {Function}
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* @api public
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*/
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app.callback = function(){
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var mw = [respond].concat(this.middleware);
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var fn = compose(mw)(downstream);
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var self = this;
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return function(req, res){
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2013-08-18 18:14:01 +00:00
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var ctx = new self.Context(self, req, res);
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2013-08-17 07:15:57 +00:00
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function done(err) {
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if (err) ctx.error(err);
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}
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co.call(ctx, function *(){
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yield fn;
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}, done);
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}
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};
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/**
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* Response middleware.
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*/
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function respond(next){
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return function *(){
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yield next;
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var res = this.res;
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var body = this.body;
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var head = 'HEAD' == this.method;
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var ignore = 204 == this.status || 304 == this.status;
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// 404
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if (null == body && 200 == this.status) {
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this.status = 404;
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}
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// ignore body
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if (ignore) return res.end();
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// status body
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if (null == body) {
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this.set('Content-Type', 'text/plain');
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body = http.STATUS_CODES[this.status];
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}
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2013-08-17 22:36:51 +00:00
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2013-08-17 07:15:57 +00:00
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// Buffer body
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if (Buffer.isBuffer(body)) {
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var ct = this.responseHeader['content-type'];
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if (!ct) this.set('Content-Type', 'application/octet-stream');
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this.set('Content-Length', body.length);
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if (head) return res.end();
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return res.end(body);
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}
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// string body
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if ('string' == typeof body) {
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var ct = this.responseHeader['content-type'];
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if (!ct) this.set('Content-Type', 'text/plain; charset=utf-8');
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this.set('Content-Length', Buffer.byteLength(body));
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if (head) return res.end();
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return res.end(body);
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}
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// Stream body
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if (body instanceof Stream) {
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body.on('error', this.error.bind(this));
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if (head) return res.end();
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return body.pipe(res);
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}
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2013-08-17 22:36:51 +00:00
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2013-08-17 07:15:57 +00:00
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// body: json
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body = JSON.stringify(body, null, this.app.jsonSpaces);
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this.set('Content-Length', body.length);
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this.set('Content-Type', 'application/json');
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if (head) return res.end();
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res.end(body);
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}
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}
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/**
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* Default downstream middleware.
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2013-08-18 18:14:01 +00:00
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*
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* @api private
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2013-08-17 07:15:57 +00:00
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*/
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function *downstream() {
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this.status = 200;
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if (this.app.poweredBy) this.set('X-Powered-By', 'koa');
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}
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2013-08-18 18:14:01 +00:00
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/**
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* Create a new `Context` constructor.
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*
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* @return {Function}
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* @api private
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*/
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function createContext() {
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return function Context(app, req, res){
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this.app = app;
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this.req = req;
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this.res = res;
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}
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}
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