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1 | /*
* 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 errors = require('../../errors'),
dbService = require('../model/dbConn'),
Device = require('../model/Device');
/**
* Generic function to retrieve a device based on a parameter value. This is an auxiliary function meant to abstract
* all the getBySomething functions.
*
* @param {String} parameterName Name of the parameter that is used to identify the device.
* @param {String} parameterValue Value of the parameter to check.
*/
function getByParameter(parameterName, parameterValue, callback) {
var query,
filter = {};
filter[parameterName] = parameterValue;
query = Device.model.findOne(filter);
query.select({__v: 0});
query.exec(function handleGet(error, data) {
Iif (error) {
callback(errors.InternalDbError(error));
} else if (data) {
callback(null, data);
} else {
callback(new errors.DeviceNotFound(parameterValue));
}
});
}
/**
* Auxiliary function to transform a Mongoose DAO to a plain JS Object as part of the callback process. It returns a
* function that will invoke the callback passed as a parameter transforming the received model object before.
*/
function toObject(callback) {
return function (error, result) {
if (error) {
callback(error);
} else {
callback(null, result.toObject());
}
};
}
/**
* Retrieves from the registry the object identified by the given id.
*
* @param {String} id Id of the object to be retrieved.
*/
function getObject(id, callback) {
getByParameter('id', id, toObject(callback));
}
/**
* Gets the device that has the device name passed as a parameter (should be unique) or return a DeviceNotFound error
* in case none exist.
*
* @param {String} deviceName Name of the device to retrieve.
*/
function getByName(deviceName, callback) {
getByParameter('name', deviceName, toObject(callback));
}
/**
* Inserts the given object in the registry. The generated ID is returned through the callback.
*
* @param {Object} object Object to insert into the registry.
*/
function register(object, callback) {
function saveDeviceHandler(error, deviceDAO) {
Iif (error) {
callback(errors.InternalDbError(error));
} else {
callback(null, deviceDAO.id);
}
}
function mongoStore(innerCb) {
var deviceObj = new Device.model();
deviceObj.address = object.address;
deviceObj.lifetime = object.lifetime;
deviceObj.name = object.name;
deviceObj.type = object.type;
deviceObj.save(innerCb);
}
mongoStore(saveDeviceHandler);
}
/**
* Removes the object identified by this id from the registry. The removed object is passed as the first callback
* parameter.
*
* @param {Integer} id Identifier of the object to be removed.
*/
function unregister(id, callback) {
Device.model.findOneAndRemove({ id: id }, function(error, device) {
if (error) {
callback(errors.InternalDbError(error));
} else if (device) {
callback(null, device.toObject());
} else {
callback(errors.DeviceNotFound(id));
}
});
}
/**
* Remove all the objects from the registry.
*/
function clean(callback) {
Device.model.remove({}, function(error, number) {
Iif (error) {
callback(errors.InternalDbError(error));
} else {
callback(null);
}
});
}
/**
* Update the object identified with the given id with the object value passed as a parameter.
*
* @param {String} id Id of the object to update.
* @param {Object} obj New object value to insert in the registry.
*/
function update(id, obj, callback) {
getByParameter('id', id, function(error, objDAO) {
if (error) {
callback(error);
} else {
objDAO.id = obj.id;
objDAO.type = objDAO.type;
objDAO.save(toObject(callback));
}
});
}
/**
* Returns an array of all the devices as the parameter of the callback.
*/
function list(callback) {
var condition = {},
query;
query = Device.model.find(condition).sort();
query.exec(callback);
}
/**
* Initializes the device registry based on the parameter found in the configuration. The MongoDB config object should
* contain at least the host string needed to connect to MongoDB and the database name where to store the device info.
* The configuration object to use should be the one corresponding to the general server configuration, although all
* the Mongo specific information should be stored under the 'deviceRegistry' section.
*
* @param {Object} config Configuration object containing a deviceRegistry attribute with the info.
*/
function init(newConfig, callback) {
dbService.init(newConfig.deviceRegistry.host, newConfig.deviceRegistry.db, callback);
}
exports.register = register;
exports.unregister = unregister;
exports.get = getObject;
exports.update = update;
exports.clean = clean;
exports.list = list;
exports.getByName = getByName;
exports.init = init; |