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node-red/red/runtime/nodes/context/memory.js

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var util = require("../../util");
function Memory(config){
this.data = {};
}
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Memory.prototype.open = function(){
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return Promise.resolve();
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};
Memory.prototype.close = function(){
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return Promise.resolve();
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};
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Memory.prototype.get = function(scope, key, callback) {
var value;
try{
if(this.data[scope]){
value = util.getMessageProperty(this.data[scope], key);
}
}catch(err){
if(callback){
callback(err);
}else{
throw err;
}
}
if(callback){
callback(null, value);
} else {
return value;
}
};
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Memory.prototype.set =function(scope, key, value, callback) {
if(!this.data[scope]){
this.data[scope] = {};
}
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try{
util.setMessageProperty(this.data[scope],key,value);
}catch(err){
if(callback){
callback(err);
}else{
throw err;
}
}
if(callback){
callback(null);
}
};
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Memory.prototype.keys = function(scope, callback){
var values = [];
try{
if(this.data[scope]){
if (scope !== "global") {
values = Object.keys(this.data[scope]);
} else {
values = Object.keys(this.data[scope]).filter(function (key) {
return key !== "set" && key !== "get" && key !== "keys";
});
}
}
}catch(err){
if(callback){
callback(err);
}else{
throw err;
}
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}
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if(callback){
callback(null, values);
} else {
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return values;
}
};
Memory.prototype.delete = function(scope){
delete this.data[scope];
return Promise.resolve();
};
Memory.prototype.clean = function(activeNodes){
for(var id in this.data){
if(this.data.hasOwnProperty(id) && id !== "global"){
var idParts = id.split(":");
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if(activeNodes.indexOf(idParts[0]) === -1){
delete this.data[id];
}
}
}
return Promise.resolve();
}
Memory.prototype._export = function() {
return this.data;
}
module.exports = function(config){
return new Memory(config);
};