mirror of
https://github.com/node-red/node-red.git
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- Implement `delete` function - Swap default easily - Change memory context as a plugin - Update localfilesystem plugin - Change file/folder structure
195 lines
5.7 KiB
JavaScript
195 lines
5.7 KiB
JavaScript
/**
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* Copyright JS Foundation and other contributors, http://js.foundation
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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 clone = require("clone");
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var util = require("../../util");
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var settings;
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var contexts = {};
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var globalContext = null;
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var externalContexts = {};
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function init(_settings) {
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settings = _settings;
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externalContexts = {};
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// init meomory plugin
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externalContexts["_"] = require("./memory");
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externalContexts["_"].init();
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globalContext = createContext("global",settings.functionGlobalContext || {});
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}
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function load() {
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// load & init plugins in settings.contextStorage
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var plugins = settings.contextStorage;
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var alias = null;
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if (plugins) {
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for(var pluginName in plugins){
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if(pluginName === "_"){
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continue;
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}
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if(pluginName === "default" && typeof plugins[pluginName] === "string"){
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alias = plugins[pluginName];
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continue;
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}
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var plugin;
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if(plugins[pluginName].hasOwnProperty("module")){
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var config = plugins[pluginName].config || {};
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copySettings(config, settings);
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try{
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plugin = require("./"+plugins[pluginName].module);
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}catch(err){
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throw new Error(plugins[pluginName].module + " could not be loaded");
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}
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plugin.init(config);
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externalContexts[pluginName] = plugin;
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}else{
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throw new Error("module is is not defined in settings.contextStorage." + plugins[pluginName] );
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}
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}
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if(alias){
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if(externalContexts.hasOwnProperty(alias)){
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externalContexts["default"] = externalContexts[alias];
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}else{
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throw new Error("default is invalid" + plugins["default"])
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}
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}
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}
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}
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function copySettings(config, settings){
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var copy = ["userDir"]
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config.settings = {};
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copy.forEach(function(setting){
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config.settings[setting] = clone(settings[setting]);
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});
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}
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function createContext(id,seed) {
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var scope = id;
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var obj = seed || {};
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obj.get = function(key) {
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var result = parseKey(key);
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if(!result){
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return externalContexts["_"].get(key, scope);
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}
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if(externalContexts.hasOwnProperty(result[0])){
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return externalContexts[result[0]].get(result[1], scope);
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}else if(externalContexts.hasOwnProperty("defalut")){
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return externalContexts["defalut"].get(result[1], scope);
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}else{
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throw new Error(result[0] + " is not defined in setting.js");
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}
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};
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obj.set = function(key, value) {
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var result = parseKey(key);
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if(!result){
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return externalContexts["_"].set(key, value, scope);
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}
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if(externalContexts.hasOwnProperty(result[0])){
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externalContexts[result[0]].set(result[1], value, scope);
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}else if(externalContexts.hasOwnProperty("defalut")){
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externalContexts["defalut"].set(result[1], value, scope);
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}else{
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throw new Error(result[0] + " is not defined in setting.js");
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}
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};
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obj.keys = function() {
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//TODO: discuss about keys() behavior
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var keys = [];
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for(var plugin in externalContexts){
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keys.concat(externalContexts[plugin].keys(scope));
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}
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return keys;
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};
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if(id === "global"){
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externalContexts["_"].setGlobalContext(seed);
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}
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return obj;
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}
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function getContext(localId,flowId) {
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var contextId = localId;
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if (flowId) {
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contextId = localId+":"+flowId;
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}
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if (contexts.hasOwnProperty(contextId)) {
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return contexts[contextId];
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}
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var newContext = createContext(contextId);
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if (flowId) {
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newContext.flow = getContext(flowId);
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}
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if (globalContext) {
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newContext.global = globalContext;
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}
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contexts[contextId] = newContext;
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return newContext;
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}
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function deleteContext(id,flowId) {
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var contextId = id;
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if (flowId) {
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contextId = id+":"+flowId;
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}
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for(var plugin in externalContexts){
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externalContexts[plugin].delete(contextId);
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}
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delete contexts[contextId];
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}
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function clean(flowConfig) {
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var activeIds = {};
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var contextId;
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var node;
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for (var id in contexts) {
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if (contexts.hasOwnProperty(id)) {
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var idParts = id.split(":");
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if (!flowConfig.allNodes.hasOwnProperty(idParts[0])) {
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for(var plugin in externalContexts){
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externalContexts[plugin].delete(id);
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}
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delete contexts[id];
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}
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}
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}
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}
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function parseKey(key){
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var keys = null;
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if(!key){
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return null;
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}
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var index_$ = key.indexOf("$");
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var index_dot = key.indexOf(".", 1);
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if(index_$ === 0 && index_dot){
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keys = [];
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keys[0] = key.substring(1,index_dot);
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keys[1] = key.substring(index_dot + 1);
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keys[0] = keys[0] || "default";
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}
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return keys;
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}
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module.exports = {
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init: init,
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load: load,
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get: getContext,
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delete: deleteContext,
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clean:clean
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};
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