118 lines
2.7 KiB
JavaScript
118 lines
2.7 KiB
JavaScript
/**
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* The Group Manager provides functions to manage groups in the database
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*/
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/*
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* 2011 Peter 'Pita' Martischka
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var db = require("./DB").db;
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var async = require("async");
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exports.doesGroupExist = function(groupID, callback)
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{
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//try to get the group entry
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db.get("group:" + groupID, function (err, group)
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{
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callback(err, group != null);
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});
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}
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exports.createGroup = function(callback)
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{
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//search for non existing groupID
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var groupID;
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var foundNonExistingGroupID = false;
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async.whilst(
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function () { return !foundNonExistingGroupID; },
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function (callback)
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{
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//generate a random 10 digit groupID
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groupID = "";
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for(var i=0;i<10;i++)
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{
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groupID+=Math.floor(Math.random()*10);
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}
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//check if this groupID already exisits
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exports.doesGroupExist(groupID, function(err, exists)
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{
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foundNonExistingGroupID = !exists;
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callback(err);
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})
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},
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//we found a non existing groupID or an error happend
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function (err)
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{
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//check for errors
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if(err)
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{
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callback(err);
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return;
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}
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//create the group
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db.set("group:" + groupID, {pads: {}});
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callback(null, {groupID: groupID});
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}
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);
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}
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exports.getMappedGroup4 = function(groupMapper, callback)
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{
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//ensure mapper is optional
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if(typeof groupMapper != "string")
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{
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callback({stop: "groupMapper is no string"});
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return;
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}
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//try to get a group for this mapper
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db.get("mapper2group:"+groupMapper, function(err, groupID)
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{
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if(err)
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{
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callback(err);
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return;
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}
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//there is no group for this mapper, let's create a group
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if(groupID == null)
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{
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exports.createGroup(function(err, responseObj)
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{
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//check for errors
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if(err)
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{
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callback(err);
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return;
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}
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//create the mapper entry for this group
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db.set("mapper2group:"+groupMapper, responseObj.groupID);
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callback(null, responseObj);
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});
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}
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//there is a group for this mapper, let's return it
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else
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{
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callback(err, {groupID: groupID});
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}
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});
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}
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