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

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
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*
* 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 clone = require("clone");
var when = require("when");
var util = require("../util");
function createContext(id,seed) {
var data = seed || {};
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var obj = seed || {};
obj.get = function get(key) {
return util.getMessageProperty(data,key);
};
obj.set = function set(key, value) {
util.setMessageProperty(data,key,value);
}
obj.keys = function() {
var keysData = Object.keys(data);
if (seed == null) {
return keysData;
} else {
return keysData.filter(function (key) {
return key !== "set" && key !== "get" && key !== "keys";
});
}
}
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return obj;
}
var contexts = {};
var globalContext = null;
function getContext(localId,flowId) {
var contextId = localId;
if (flowId) {
contextId = localId+":"+flowId;
}
if (contexts.hasOwnProperty(contextId)) {
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return contexts[contextId];
}
var newContext = createContext(contextId);
if (flowId) {
newContext.flow = getContext(flowId);
}
if (globalContext) {
newContext.global = globalContext;
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}
contexts[contextId] = newContext;
return newContext;
}
function deleteContext(id,flowId) {
var contextId = id;
if (flowId) {
contextId = id+":"+flowId;
}
delete contexts[contextId];
}
function clean(flowConfig) {
var activeIds = {};
var contextId;
var node;
for (var id in contexts) {
if (contexts.hasOwnProperty(id)) {
var idParts = id.split(":");
if (!flowConfig.allNodes.hasOwnProperty(idParts[0])) {
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delete contexts[id];
}
}
}
}
module.exports = {
init: function(settings) {
globalContext = createContext("global",settings.functionGlobalContext || {});
},
get: getContext,
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delete: deleteContext,
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clean:clean
};