mirror of
https://github.com/node-red/node-red.git
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275 lines
9.1 KiB
JavaScript
275 lines
9.1 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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/**
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* Local file-system based context storage
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*
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* Configuration options:
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* {
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* base: "contexts", // the base directory to use
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* // default: "contexts"
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* dir: "/path/to/storage", // the directory to create the base directory in
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* // default: settings.userDir
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* cache: true // whether to cache contents in memory
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* // default: true
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* }
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*
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*
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* $HOME/.node-red/contexts
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* ├── global
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* │ └── global_context.json
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* ├── <id of Flow 1>
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* │ ├── flow_context.json
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* │ ├── <id of Node a>.json
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* │ └── <id of Node b>.json
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* └── <id of Flow 2>
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* ├── flow_context.json
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* ├── <id of Node x>.json
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* └── <id of Node y>.json
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*/
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var fs = require('fs-extra');
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var path = require("path");
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var util = require("../../util");
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var MemoryStore = require("./memory");
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function getStoragePath(storageBaseDir, scope) {
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if(scope.indexOf(":") === -1){
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if(scope === "global"){
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return path.join(storageBaseDir,"global",scope);
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}else{ // scope:flow
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return path.join(storageBaseDir,scope,"flow");
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}
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}else{ // scope:local
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var ids = scope.split(":")
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return path.join(storageBaseDir,ids[1],ids[0]);
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}
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}
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function getBasePath(config) {
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var base = config.base || "contexts";
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var storageBaseDir;
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if (!config.dir) {
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if(config.settings && config.settings.userDir){
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storageBaseDir = path.join(config.settings.userDir, base);
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}else{
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try {
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fs.statSync(path.join(process.env.NODE_RED_HOME,".config.json"));
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storageBaseDir = path.join(process.env.NODE_RED_HOME, base);
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} catch(err) {
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try {
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// Consider compatibility for older versions
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if (process.env.HOMEPATH) {
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fs.statSync(path.join(process.env.HOMEPATH,".node-red",".config.json"));
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storageBaseDir = path.join(process.env.HOMEPATH, ".node-red", base);
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}
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} catch(err) {
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}
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if (!storageBaseDir) {
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storageBaseDir = path.join(process.env.HOME || process.env.USERPROFILE || process.env.HOMEPATH || process.env.NODE_RED_HOME,".node-red", base);
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}
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}
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}
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}else{
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storageBaseDir = path.join(config.dir, base);
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}
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return storageBaseDir;
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}
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function loadFile(storagePath){
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return fs.pathExists(storagePath).then(function(exists){
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if(exists === true){
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return fs.readFile(storagePath, "utf8");
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}else{
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return Promise.resolve(undefined);
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}
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}).catch(function(err){
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throw Promise.reject(err);
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});
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}
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function LocalFileSystem(config){
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this.config = config;
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this.storageBaseDir = getBasePath(this.config);
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if (config.hasOwnProperty('cache')?config.cache:true) {
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this.cache = MemoryStore({});
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}
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}
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LocalFileSystem.prototype.open = function(){
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var self = this;
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if (this.cache) {
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var scopes = [];
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var promises = [];
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var subdirs = [];
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var subdirPromises = [];
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return fs.readdir(self.storageBaseDir).then(function(dirs){
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dirs.forEach(function(fn) {
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var p = getStoragePath(self.storageBaseDir ,fn)+".json";
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scopes.push(fn);
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promises.push(loadFile(p));
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subdirs.push(path.join(self.storageBaseDir,fn));
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subdirPromises.push(fs.readdir(path.join(self.storageBaseDir,fn)));
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})
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return Promise.all(subdirPromises);
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}).then(function(dirs) {
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dirs.forEach(function(files,i) {
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files.forEach(function(fn) {
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if (fn !== 'flow.json' && fn !== 'global.json') {
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scopes.push(fn.substring(0,fn.length-5)+":"+scopes[i]);
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promises.push(loadFile(path.join(subdirs[i],fn)))
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}
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});
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})
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return Promise.all(promises);
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}).then(function(res) {
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scopes.forEach(function(scope,i) {
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var data = res[i]?JSON.parse(res[i]):{};
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Object.keys(data).forEach(function(key) {
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self.cache.set(scope,key,data[key]);
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})
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});
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}).catch(function(err){
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if(err.code == 'ENOENT') {
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return fs.ensureDir(self.storageBaseDir);
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}else{
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return Promise.reject(err);
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}
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});
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} else {
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return Promise.resolve();
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}
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}
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LocalFileSystem.prototype.close = function(){
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return Promise.resolve();
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}
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LocalFileSystem.prototype.get = function(scope, key, callback) {
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if (this.cache) {
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return this.cache.get(scope,key,callback);
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}
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if(typeof callback !== "function"){
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throw new Error("Callback must be a function");
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}
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var storagePath = getStoragePath(this.storageBaseDir ,scope);
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loadFile(storagePath + ".json").then(function(data){
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if(data){
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callback(null, util.getMessageProperty(JSON.parse(data),key));
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}else{
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callback(null, undefined);
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}
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}).catch(function(err){
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callback(err);
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});
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};
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LocalFileSystem.prototype._set = function(scope, key, value, callback) {
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var storagePath = getStoragePath(this.storageBaseDir ,scope);
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loadFile(storagePath + ".json").then(function(data){
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var obj = data ? JSON.parse(data) : {}
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util.setMessageProperty(obj,key,value);
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return fs.outputFile(storagePath + ".json", JSON.stringify(obj, undefined, 4), "utf8");
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}).then(function(){
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if(typeof callback === "function"){
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callback(null);
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}
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}).catch(function(err){
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if(typeof callback === "function"){
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callback(err);
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}
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});
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}
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LocalFileSystem.prototype.set = function(scope, key, value, callback) {
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if (this.cache) {
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this.cache.set(scope,key,value,callback);
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// With cache enabled, no need to re-read the file prior to writing.
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var newContext = this.cache._export()[scope];
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var storagePath = getStoragePath(this.storageBaseDir ,scope);
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fs.outputFile(storagePath + ".json", JSON.stringify(newContext, undefined, 4), "utf8").catch(function(err) {
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});
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} else if (callback && typeof callback !== 'function') {
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throw new Error("Callback must be a function");
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} else {
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this._set(scope,key,value,callback);
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}
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};
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LocalFileSystem.prototype.keys = function(scope, callback){
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if (this.cache) {
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return this.cache.keys(scope,callback);
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}
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if(typeof callback !== "function"){
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throw new Error("Callback must be a function");
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}
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var storagePath = getStoragePath(this.storageBaseDir ,scope);
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loadFile(storagePath + ".json").then(function(data){
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if(data){
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callback(null, Object.keys(JSON.parse(data)));
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}else{
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callback(null, []);
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}
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}).catch(function(err){
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callback(err);
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});
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};
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LocalFileSystem.prototype.delete = function(scope){
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var cachePromise;
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if (this.cache) {
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cachePromise = this.cache.delete(scope);
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} else {
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cachePromise = Promise.resolve();
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}
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var that = this;
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return cachePromise.then(function() {
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var storagePath = getStoragePath(that.storageBaseDir,scope);
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return fs.remove(storagePath + ".json");
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});
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}
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LocalFileSystem.prototype.clean = function(activeNodes){
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var self = this;
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var cachePromise;
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if (this.cache) {
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cachePromise = this.cache.clean(activeNodes);
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} else {
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cachePromise = Promise.resolve();
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}
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return cachePromise.then(function() {
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return fs.readdir(self.storageBaseDir).then(function(dirs){
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return Promise.all(dirs.reduce(function(result, item){
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if(item !== "global" && activeNodes.indexOf(item) === -1){
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result.push(fs.remove(path.join(self.storageBaseDir,item)));
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}
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return result;
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},[]));
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}).catch(function(err){
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if(err.code == 'ENOENT') {
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return Promise.resolve();
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}else{
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return Promise.reject(err);
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}
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});
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});
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}
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module.exports = function(config){
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return new LocalFileSystem(config);
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};
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