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node-red/red/runtime/nodes/context/index.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 log = require("../../log");
var memory = require("./memory");
var settings;
// A map of scope id to context instance
var contexts = {};
// A map of store name to instance
var stores = {};
var storeList = [];
var defaultStore;
// Whether there context storage has been configured or left as default
var hasConfiguredStore = false;
function init(_settings) {
settings = _settings;
stores = {};
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var seed = settings.functionGlobalContext || {};
contexts['global'] = createContext("global",seed);
stores["_"] = new memory();
defaultStore = "memory";
}
function load() {
return new Promise(function(resolve,reject) {
// load & init plugins in settings.contextStorage
var plugins = settings.contextStorage || {};
var defaultIsAlias = false;
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var promises = [];
if (plugins && Object.keys(plugins).length > 0) {
var hasDefault = plugins.hasOwnProperty('default');
var defaultName;
for (var pluginName in plugins) {
if (plugins.hasOwnProperty(pluginName)) {
// "_" is a reserved name - do not allow it to be overridden
if (pluginName === "_") {
continue;
}
// Check if this is setting the 'default' context to be a named plugin
if (pluginName === "default" && typeof plugins[pluginName] === "string") {
// Check the 'default' alias exists before initialising anything
if (!plugins.hasOwnProperty(plugins[pluginName])) {
return reject(new Error(log._("context.error-invalid-default-module", {storage:plugins["default"]})));
}
defaultIsAlias = true;
continue;
}
if (!hasDefault && !defaultName) {
defaultName = pluginName;
}
var plugin;
if (plugins[pluginName].hasOwnProperty("module")) {
// Get the provided config and copy in the 'approved' top-level settings (eg userDir)
var config = plugins[pluginName].config || {};
copySettings(config, settings);
if (typeof plugins[pluginName].module === "string") {
// This config identifies the module by name - assume it is a built-in one
// TODO: check it exists locally, if not, try to require it as-is
try {
plugin = require("./"+plugins[pluginName].module);
} catch(err) {
return reject(new Error(log._("context.error-module-not-loaded", {module:plugins[pluginName].module})));
}
} else {
// Assume `module` is an already-required module we can use
plugin = plugins[pluginName].module;
}
try {
// Create a new instance of the plugin by calling its module function
stores[pluginName] = plugin(config);
} catch(err) {
return reject(new Error(log._("context.error-loading-module",{module:pluginName,message:err.toString()})));
}
} else {
// Plugin does not specify a 'module'
return reject(new Error(log._("context.error-module-not-defined", {storage:pluginName})));
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}
}
}
// Open all of the configured contexts
for (var plugin in stores) {
if (stores.hasOwnProperty(plugin)) {
promises.push(stores[plugin].open());
}
}
// There is a 'default' listed in the configuration
if (hasDefault) {
// If 'default' is an alias, point it at the right module - we have already
// checked that it exists. If it isn't an alias, then it will
// already be set to a configured store
if (defaultIsAlias) {
stores["_"] = stores[plugins["default"]];
defaultStore = plugins["default"];
} else {
stores["_"] = stores["default"];
defaultStore = "default";
}
} else if (defaultName) {
// No 'default' listed, so pick first in list as the default
stores["_"] = stores[defaultName];
defaultStore = defaultName;
defaultIsAlias = true;
} else {
// else there were no stores list the config object - fall through
// to below where we default to a memory store
storeList = ["memory"];
defaultStore = "memory";
}
hasConfiguredStore = true;
storeList = Object.keys(stores).filter(n=>!(defaultIsAlias && n==="default") && n!== "_");
} else {
// No configured plugins
promises.push(stores["_"].open())
storeList = ["memory"];
defaultStore = "memory";
}
return resolve(Promise.all(promises));
});
}
function copySettings(config, settings){
var copy = ["userDir"]
config.settings = {};
copy.forEach(function(setting){
config.settings[setting] = clone(settings[setting]);
});
}
function getContextStorage(storage) {
if (stores.hasOwnProperty(storage)) {
// A known context
return stores[storage];
} else if (stores.hasOwnProperty("_")) {
// Not known, but we have a default to fall back to
return stores["_"];
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} else {
// Not known and no default configured
var contextError = new Error(log._("context.error-use-undefined-storage", {storage:storage}));
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contextError.name = "ContextError";
throw contextError;
}
}
function createContext(id,seed) {
// Seed is only set for global context - sourced from functionGlobalContext
var scope = id;
var obj = seed || {};
var seedKeys;
if (seed) {
seedKeys = Object.keys(seed);
}
obj.get = function(key, storage, callback) {
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var context;
if (!storage && !callback) {
context = stores["_"];
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} else {
if (typeof storage === 'function') {
callback = storage;
storage = "_";
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}
if (typeof callback !== 'function'){
throw new Error("Callback must be a function");
}
context = getContextStorage(storage);
}
if (seed) {
// Get the value from the underlying store. If it is undefined,
// check the seed for a default value.
if (callback) {
if (!Array.isArray(key)) {
context.get(scope,key,function(err, v) {
if (v === undefined) {
callback(err, seed[key]);
} else {
callback(err, v);
}
});
} else {
// If key is an array, get the value of each key.
var storeValues = [];
var keys = key.slice();
var _key = keys.shift();
var cb = function(err, v) {
if (err) {
callback(err);
} else {
if (v === undefined) {
storeValues.push(seed[_key]);
} else {
storeValues.push(v);
}
if (keys.length === 0) {
callback.apply(null, [null].concat(storeValues));
} else {
_key = keys.shift();
context.get(scope, _key, cb);
}
}
};
context.get(scope, _key, cb);
}
} else {
// No callback, attempt to do this synchronously
var storeValue = context.get(scope,key);
if (storeValue === undefined) {
return seed[key];
} else {
return storeValue;
}
}
} else {
if (!Array.isArray(key)) {
return context.get(scope, key, callback);
} else {
var storeValues = [];
var keys = key.slice();
var cb = function(err, v) {
if (err) {
callback(err);
} else {
storeValues.push(v);
if (keys.length === 0) {
callback.apply(null, [null].concat(storeValues));
} else {
context.get(scope, keys.shift(), cb);
}
}
};
context.get(scope, keys.shift(), cb);
}
}
};
obj.set = function(key, value, storage, callback) {
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var context;
if (!storage && !callback) {
context = stores["_"];
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} else {
if (typeof storage === 'function') {
callback = storage;
storage = "_";
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}
if (callback && typeof callback !== 'function') {
throw new Error("Callback must be a function");
}
context = getContextStorage(storage);
}
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context.set(scope, key, value, callback);
};
obj.keys = function(storage, callback) {
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var context;
if (!storage && !callback) {
context = stores["_"];
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} else {
if (typeof storage === 'function') {
callback = storage;
storage = "_";
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}
if (typeof callback !== 'function') {
throw new Error("Callback must be a function");
}
context = getContextStorage(storage);
}
if (seed) {
if (callback) {
context.keys(scope, function(err,keys) {
callback(err,Array.from(new Set(seedKeys.concat(keys)).keys()));
});
} else {
var keys = context.keys(scope);
return Array.from(new Set(seedKeys.concat(keys)).keys())
}
} else {
return context.keys(scope, callback);
}
};
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return obj;
}
function getContext(localId,flowId) {
var contextId = localId;
if (flowId) {
contextId = localId+":"+flowId;
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}
if (contexts.hasOwnProperty(contextId)) {
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return contexts[contextId];
}
var newContext = createContext(contextId);
if (flowId) {
newContext.flow = getContext(flowId);
}
newContext.global = contexts['global'];
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contexts[contextId] = newContext;
return newContext;
}
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function deleteContext(id,flowId) {
if(!hasConfiguredStore){
// only delete context if there's no configured storage.
var contextId = id;
if (flowId) {
contextId = id+":"+flowId;
}
delete contexts[contextId];
return stores["_"].delete(contextId);
}else{
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return Promise.resolve();
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}
}
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function clean(flowConfig) {
var promises = [];
for(var plugin in stores){
if(stores.hasOwnProperty(plugin)){
promises.push(stores[plugin].clean(Object.keys(flowConfig.allNodes)));
}
}
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for (var id in contexts) {
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if (contexts.hasOwnProperty(id) && id !== "global") {
var idParts = id.split(":");
if (!flowConfig.allNodes.hasOwnProperty(idParts[0])) {
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delete contexts[id];
}
}
}
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return Promise.all(promises);
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}
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function close() {
var promises = [];
for(var plugin in stores){
if(stores.hasOwnProperty(plugin)){
promises.push(stores[plugin].close());
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}
}
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return Promise.all(promises);
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}
function listStores() {
return {default:defaultStore,stores:storeList};
}
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module.exports = {
init: init,
load: load,
listStores: listStores,
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get: getContext,
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delete: deleteContext,
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clean: clean,
close: close
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};