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output-handler.server.js
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/
output-handler.server.js
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/*
* Copyright (c) 2011-2013, Yahoo! Inc. All rights reserved.
* Copyrights licensed under the New BSD License.
* See the accompanying LICENSE file for terms.
*/
/*jslint anon:true, sloppy:true, nomen:true*/
/**
* This is an object used as the single pathway for data to leave a mojit
* action execution. It is used as a component of the ActionContext object,
* which uses it to call <em>done</em> and <em>flush</em> in order to complete.
*
* There are two versions of this object, one for the client, and one for the
* server. This is the server version, which is more complex than the client
* version.
*
* @class OutputHandler
* @param {Object} req The Request object.
* @param {Object} res The Response object.
* @param {Function} next The next function, which should be invokable.
* @constructor
*/
var NAME = 'OutputHandler.server',
libutil = require('util'),
OutputHandler = function(req, res, next) {
this.req = req;
this.res = res;
this.next = next;
this.headers = {};
this.page = {};
};
OutputHandler.prototype = {
setLogger: function(logger) {
this.logger = logger;
},
flush: function(data, meta) {
this._readMeta(meta);
this._writeHeaders();
this.res.write(data);
},
done: function(data, meta) {
var name,
obj,
size,
memDebug = {};
this.logger.log('done', 'mojito', NAME);
this._readMeta(meta);
this._writeHeaders();
if (!data ||
(typeof data !== 'string' && Object.keys(data).length === 0)) {
data = '';
}
this.res.end(data);
this.logger.log('END', 'mojito', NAME);
},
error: function(err) {
err = err || new Error('Unknown error occurred');
if (!err.code) {
err.code = 500;
}
if (err.code === 404) {
// FUTURE: [Issue 96] default Mojito 404 page
this.logger.log(err, 'warn', NAME);
} else {
this.logger.log(err, 'error', NAME);
}
var out = '<html>' +
'<body><h1>Error: ' + err.code + '</h1>' +
// The following line that includes the error message has been
// removed because the Paranoids don't want this data to be
// revealed in production environments. Once the bug having
// to do with different development environments has been
// fixed, we will be able to conditionally display the error
// details.
// "<p>" + err.message + "</p>" +
'<p>Error details are not available.</p>' +
'</body>' +
'</html>';
// TODO: [Issue 96] If YUI._mojito.DEBUG, add stack.
this.done(out, {
http: {
code: err.code,
reasonPhrase: err.reasonPhrase,
headers: {
'content-type': 'text/html'
}
}
});
},
_readMeta: function(meta) {
if (!meta || !meta.http) { return; }
var header;
for (header in meta.http.headers) {
if (meta.http.headers.hasOwnProperty(header)) {
this.headers[header] = meta.http.headers[header];
}
}
this.statusCode = meta.http.code;
this.reasonPhrase = meta.http.reasonPhrase;
},
_writeHeaders: function() {
if (!this.headersSent) {
// passing a falsy reason phrase would break, because node uses every non-string arguments[1]
// as header object/array
if (this.reasonPhrase && typeof this.reasonPhrase === 'string') {
this.res.writeHead(this.statusCode || 200, this.reasonPhrase, this.headers);
} else {
this.res.writeHead(this.statusCode || 200, this.headers);
}
this.headersSent = true;
}
}
};
/**
*/
module.exports = OutputHandler;