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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'),
registryBus = new (require('events')).EventEmitter(),
registry = {},
attributesRegistry = {},
OBJECT_URI_REGEX = /^\/\d+\/\d+$/;
registryBus.setMaxListeners(0);
/**
* Parse a string containing an Object URI. If the URI is not well-formed or if it contains anything beyond the Object
* ID, an error is raised.
*
* @param {String} objectUri String representation of an OMA LWTM2M Object URI (with object Type and Id)
*/
function parseUri(objectUri, callback) {
if (objectUri && objectUri.match && objectUri.match(OBJECT_URI_REGEX)) {
var parsedUri = objectUri.split('/'),
object = {
objectType: parsedUri[1],
objectId: parsedUri[2],
objectUri: objectUri
};
callback(null, object);
} else {
callback(new errors.WrongObjectUri(objectUri));
}
}
/**
* Get the object of the registry represented by the given String URI.
*
* @param {String} objectUri String representation of an OMA LWTM2M Object URI (with object Type and Id)
*/
function getObject(objectUri, callback) {
parseUri(objectUri, function(error, parsedObject) {
Iif (error) {
callback(error);
} else if (registry[objectUri]) {
callback(null, registry[objectUri]);
} else {
callback(new errors.ObjectNotFound(objectUri));
}
});
}
/**
* Create a new object in the registry with the given URI. If there already is an object in that URI, it is overwritten.
*
* @param {String} objectUri String representation of an OMA LWTM2M Object URI (with object Type and Id)
*/
function create(objectUri, callback) {
parseUri(objectUri, function(error, parsedObject) {
if (error) {
callback(error);
} else {
registry[objectUri] = parsedObject;
registry[objectUri].attributes = {};
callback(null, parsedObject);
}
});
}
/**
* Removes the object identified by the URI from the registry.
*
* @param {String} objectUri String representation of an OMA LWTM2M Object URI (with object Type and Id)
*/
function remove(objectUri, callback) {
parseUri(objectUri, function(error, parsedObject){
Iif (error) {
callback(error);
} else if (registry[objectUri]) {
var removedObj = registry[objectUri];
delete registry[objectUri];
callback(null, removedObj);
} else {
callback(new errors.ObjectNotFound(objectUri));
}
});
}
/**
* List all the objects in the object registry.
*/
function list(callback) {
var keyList = Object.keys(registry),
result = [];
for (var i=0; i < keyList.length; i++) {
result.push(registry[keyList[i]]);
}
callback(null, result);
}
/**
* Modify the object represented by the given URI, by setting the selected resource to the given value. If the resource
* doesn't exist it is created. If it does exist, its value is overwritten.
*
* @param {String} objectUri String representation of an OMA LWTM2M Object URI
* (with object Type and Id)
* @param {Integer} resourceId Id of the resource to set
* @param {String} resourceValue New value of the resource
*/
function setResource(objectUri, resourceId, resourceValue, callback) {
getObject(objectUri, function(error, retrievedObject) {
if (error) {
callback(error);
} else {
registryBus.emit(objectUri, 'setResource', resourceId, resourceValue);
retrievedObject.attributes[resourceId] = resourceValue;
callback(null, retrievedObject);
}
});
}
/**
* Modify the object represented by the given URI, by removing the selected resource.
*
* @param objectUri String representation of an OMA LWTM2M Object URI (with object Type and Id)
* @param {Integer} resourceId Id of the resource to remove
*/
function unsetResource(objectUri, resourceId, callback) {
getObject(objectUri, function(error, retrievedObject) {
Iif (error) {
callback(error);
} else {
delete retrievedObject.attributes[resourceId];
callback(null, retrievedObject);
}
});
}
/**
* Removes all information an handlers from the registry, setting it back to its original state.
*/
function resetRegistry(callback) {
registryBus.removeAllListeners();
registry = {};
attributesRegistry = {};
Eif (callback) {
callback();
} else {
return;
}
}
/**
* Set the attribute set passed as a parameter as the attributes for the object type, instance or resource indicated.
* The set of attributes is completely overwritten by the new one.
*
* @param {String} uri URI of an object type, instance or resource.
* @param {String} attributes Object containing the new set of attributes for the selected entity.
*/
function setAttributes(uri, attributes, callback) {
attributesRegistry[uri] = attributes;
Eif (callback) {
callback();
} else {
return;
}
}
/**
* Get the current set of attributes for the given entity (object type, instance or resource).
*
* @param {String} uri URI of an object type, instance or resource.
* @returns {Object} An object containing the current attributes or undefined if there are no attributes.
*/
function getAttributes(uri, callback) {
Eif (callback) {
callback(null, attributesRegistry[uri]);
} else {
return attributesRegistry[uri];
}
}
exports.create = create;
exports.remove = remove;
exports.get = getObject;
exports.setResource = setResource;
exports.unsetResource = unsetResource;
exports.setAttributes = setAttributes;
exports.getAttributes = getAttributes;
exports.list = list;
exports.bus = registryBus;
exports.reset = resetRegistry; |