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| /*
* Copyright 2014 Telefonica Investigación y Desarrollo, S.A.U
*
* This file is part of iotagent-lwm2m-lib
*
* iotagent-lwm2m-lib is free software: you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the License,
* or (at your option) any later version.
*
* iotagent-lwm2m-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with iotagent-lwm2m-lib.
* If not, seehttp://www.gnu.org/licenses/.
*
* For those usages not covered by the GNU Affero General Public License
* please contact with::[contacto@tid.es]
*/
'use strict';
var libcoap = require('coap'),
logger = require('logops'),
context = {
op: 'LWM2MLib.COAPRouter'
};
/**
* Handles the arrival of a request to the LWTM2M Server. To do so, it loops through the routes table, trying to match
* the pathname and method of the request to an existing route. If a route matches, and the route has a handler,
* the handler is invoked with the request, response and user handler for that operation. Otherwise, a 4.04 error is
* returned.
*
* @param {Object} serverInfo Object containing all the information of the current server.
*/
function dataHandler(serverInfo) {
return function(req, res) {
logger.debug(context, 'Handling request with method [%s] on url [%s]', req.method, req.url);
req.urlObj = require('url').parse(req.url);
for (var i in serverInfo.routes) {
if (req.method === serverInfo.routes[i][0] && req.urlObj.pathname.match(serverInfo.routes[i][1])) {
serverInfo.handlers[serverInfo.routes[i][2]]
.lib(req, res, serverInfo.handlers[serverInfo.routes[i][2]].user);
return;
}
}
res.code = '4.04';
res.end('');
};
}
function defaultHandler() {
var callback = null;
for (var i=0; i < arguments.length; i++) {
if (arguments[i] instanceof Function) {
callback = arguments[i];
}
}
callback();
}
/**
* Start the Lightweight M2M Server. This server module is a singleton, no multiple instances can be started (invoking
* start multiple times without invoking stop can have unexpected results).
*
* @param {Object} config Configuration object including all the information needed for starting the server.
*/
function startCoap(config, callback) {
var serverInfo = {
server: null,
routes: [],
handlers: null
};
logger.info(context, 'Starting COAP Server on port [%d]', config.port);
serverInfo.server = libcoap.createServer();
serverInfo.server.on('request', dataHandler(serverInfo));
serverInfo.server.listen(config.port, function (error) {
Iif (error) {
logger.error(context, 'Couldn\'t start COAP server: %s', error);
} else {
logger.info(context, 'COAP Server started successfully');
}
callback(error, serverInfo);
});
}
/**
* Stops the LWTM2M Server.
*
* @param {Object} serverInfo Object containing all the information of the current server.
*/
function stopCoap(serverInfo, callback) {
logger.info(context, 'Stopping COAP Server');
serverInfo.server.close(callback);
}
/**
* Sets the handler callback for a given type of operation. If for a given type no handler is provided, a default
* dummy handler will be used.
*
* The signature of the handler will depend on the operation being handled. The complete list of operations and the
* signature of its handlers can be found in the online documentation.
*
* @param {Object} serverInfo Object containing all the information of the current server.
* @param {String} type Name of the operation to be handled.
* @param {Function} handler Operation handler.
*/
function setHandler(serverInfo, type, handler) {
logger.debug(context, 'Setting [%s] handler', type);
serverInfo.handlers[type].user = handler;
}
exports.start = startCoap;
exports.setHandler = setHandler;
exports.stop = stopCoap;
exports.defaultHandler = defaultHandler;
|