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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 objRegistry = require('./services/client/objectRegistry'),
coap = require('coap'),
errors = require('./errors'),
async = require('async'),
apply = async.apply,
readService = require('./services/client/read'),
coapRouter = require('./services/coapRouter'),
Readable = require('stream').Readable,
logger = require('logops'),
config = require('../config'),
context = {
op: 'LWM2MLib.Client'
};
/**
* Load the internal handlers for each kind of operation. Each handler is implemented in a separated module. This
* module will be, in time, in charge of executing the user handler for that operation with all the data extracted
* from the request (and completed with internal data if needed).
*
* @param {Object} serverInfo Object containing all the information of the current server.
*/
function loadHandlers(serverInfo) {
serverInfo.handlers = {
write: {
lib: require('./services/client/write').handle,
user: coapRouter.defaultHandler
},
read: {
lib: readService.handle,
user: coapRouter.defaultHandler
}
};
}
/**
* Load the tables of available routes. For each route, the method, a regexp for the path and the name of the operation
* is indicated (the name of the operation will be used to select the internal and user handlers to execute for each
* route).
*
* @param {Object} serverInfo Object containing all the information of the current server.
*/
function loadRoutes(serverInfo) {
serverInfo.routes = [
['PUT', /(\/\d+)+/, 'write'],
['GET', /(\/\d+)+/, 'read']
];
}
function startListener(host, port, callback) {
coapRouter.start(config.client, function (error, serverInfo) {
Iif (error) {
logger.error(context, 'Failed to start COAP Router for client.');
callback(error);
} else {
logger.debug(context, 'COAP Router started successfully');
var deviceInformation = {
currentHost: host,
currentPort: port,
location: '',
serverInfo: serverInfo
};
loadHandlers(deviceInformation.serverInfo);
loadRoutes(deviceInformation.serverInfo);
callback(null, deviceInformation);
}
});
}
function createRegisterResponseHandler(deviceInformation, callback) {
return function responseHandler(res) {
Eif (res.code === '2.01') {
logger.debug(context, 'Registration succeeded to host [%s] and port [%s]',
deviceInformation.host, deviceInformation.port);
for (var i = 0; i < res.options.length; i++) {
Eif (res.options[i].name === 'Location-Path') {
deviceInformation.location = res.options[i].value;
}
}
callback(null, deviceInformation);
} else {
logger.error(context, 'Registration failed with code: ' + res.code);
callback(new errors.RegistrationFailed(res.code));
}
};
}
/**
* Creates a COAP Text representation of the objects passed as a parameter.
*
* @param {Array} objects Array containing LWM2M Object instances.
*/
function generatePayload(objects, innerCallback) {
var result = objects.reduce(function(previous, current, index, array) {
var result = previous + '<' + current.objectUri + '>';
if (index !== array.length -1) {
result += ',';
}
return result;
}, '');
logger.debug(context, 'Object list generated:\n%s', objects);
innerCallback(null, result);
}
/**
* Register the client in the Lightweight M2M Server in the seleted host and port, with the given endpoint name. If the
* registration is successful, a deviceInformation object is returned with the host and port of the connected server
* and the device location in that server (usually with the form '/rd/<deviceId>').
*
* @param {String} host Host of the LWTM2M Server
* @param {String} port Port of the LWTM2M Server
* @param {String} url URL of the LWTM2M Server (optional)
* @param {String} endpointName Name the client will be registered under
*/
function register(host, port, url, endpointName, callback) {
var rs = new Readable(),
errorEmitted = false,
creationRequest = {
host: host,
port: port,
method: 'POST',
pathname: ((url)? url : '') + '/rd',
query: 'ep=' + endpointName + '<=' + config.client.lifetime + '&lwm2m=' + config.client.version + '&b=U'
},
req = coap.request(creationRequest);
Iif (config.logLevel) {
logger.setLevel(config.client.logLevel);
}
function sendRequest(payload, innerCallback) {
logger.debug(context, 'Sending registration request');
rs.push(payload);
rs.push(null);
rs.pipe(req);
innerCallback(null);
}
function registerResponseListener(deviceInformation, innerCallback) {
req.on('response', createRegisterResponseHandler(deviceInformation, callback));
innerCallback();
}
startListener(host, port, function (error, deviceInformation) {
async.waterfall([
apply(registerResponseListener, deviceInformation),
objRegistry.list,
generatePayload,
sendRequest
]);
req.on('error', function (error) {
logger.error(context, 'Registration response finished with an error:\n%s', error);
coapRouter.stop(deviceInformation.serverInfo, function (error) {
logger.error('COAP Router stopped with result: ' + error);
});
if (!errorEmitted) {
errorEmitted = true;
callback(new errors.ServerNotFound(host + ':' + port));
}
});
});
}
/**
* Unregisters the client from the given server.
*
* @param {Object} deviceInformation Device information object retrieved during the connection
*/
function unregister(deviceInformation, callback) {
var creationRequest = {
host: deviceInformation.currentHost,
port: deviceInformation.currentPort,
method: 'DELETE',
pathname: deviceInformation.location,
agent: false
},
req = coap.request(creationRequest);
logger.debug(context, 'Unregistration request:\n%s', JSON.stringify(creationRequest, null, 4));
req.on('response', function(res) {
logger.debug(context, 'Unregistration response code:\n%s', res.code);
coapRouter.stop(deviceInformation.serverInfo, callback);
});
req.end();
}
function updateRegistration(deviceInformation, callback) {
var rs = new Readable(),
creationRequest = {
host: deviceInformation.currentHost,
port: deviceInformation.currentPort,
method: 'PUT',
pathname: deviceInformation.location,
query: 'lt=' + config.client.lifetime + '&lwm2m=' + config.client.version + '&b=U'
},
req = coap.request(creationRequest);
logger.debug(context, 'Update registration request:\n%s', JSON.stringify(creationRequest, null, 4));
function sendRequest(payload, callback) {
rs.push(payload);
rs.push(null);
rs.pipe(req);
}
req.on('response', function(res) {
logger.debug(context, 'Update registration response code:\n%s', res.code);
callback(null, deviceInformation);
});
async.waterfall([
objRegistry.list,
generatePayload,
sendRequest
]);
}
exports.registry = objRegistry;
exports.register = register;
exports.unregister = unregister;
exports.update = updateRegistration;
exports.setHandler = coapRouter.setHandler;
exports.cancelObserver = readService.cancel;
exports.cancellAllObservers = readService.cancelAll;
exports.listObservers = readService.list;
|