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node-red/red/nodes/registry/loader.js

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/**
* Copyright 2015 IBM Corp.
*
* 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 when = require("when");
var fs = require("fs");
var path = require("path");
var semver = require("semver");
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var events = require("../../events");
var localfilesystem = require("./localfilesystem");
var registry = require("./registry");
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var RED;
var settings;
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var i18n = require("../../i18n");
events.on("node-locales-dir", function(info) {
i18n.registerMessageCatalog(info.namespace,info.dir,info.file);
});
function init(_settings) {
settings = _settings;
localfilesystem.init(settings);
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RED = require('../../red');
}
function load(defaultNodesDir,disableNodePathScan) {
// To skip node scan, the following line will use the stored node list.
// We should expose that as an option at some point, although the
// performance gains are minimal.
//return loadNodeFiles(registry.getModuleList());
var nodeFiles = localfilesystem.getNodeFiles(defaultNodesDir,disableNodePathScan);
return loadNodeFiles(nodeFiles);
}
function loadNodeFiles(nodeFiles) {
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var promises = [];
for (var module in nodeFiles) {
/* istanbul ignore else */
if (nodeFiles.hasOwnProperty(module)) {
if (nodeFiles[module].redVersion &&
!semver.satisfies(RED.version().replace("-git",""), nodeFiles[module].redVersion)) {
//TODO: log it
continue;
}
if (module == "node-red" || !registry.getModuleInfo(module)) {
var first = true;
for (var node in nodeFiles[module].nodes) {
/* istanbul ignore else */
if (nodeFiles[module].nodes.hasOwnProperty(node)) {
if (module != "node-red" && first) {
// Check the module directory exists
first = false;
var fn = nodeFiles[module].nodes[node].file;
var parts = fn.split("/");
var i = parts.length-1;
for (;i>=0;i--) {
if (parts[i] == "node_modules") {
break;
}
}
var moduleFn = parts.slice(0,i+2).join("/");
try {
var stat = fs.statSync(moduleFn);
} catch(err) {
// Module not found, don't attempt to load its nodes
break;
}
}
try {
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promises.push(loadNodeConfig(nodeFiles[module].nodes[node]))
} catch(err) {
//
}
}
}
}
}
}
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return when.settle(promises).then(function(results) {
var nodes = results.map(function(r) {
registry.addNodeSet(r.value.id,r.value,r.value.version);
return r.value;
});
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return loadNodeSetList(nodes);
});
}
function loadNodeConfig(fileInfo) {
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return when.promise(function(resolve) {
var file = fileInfo.file;
var module = fileInfo.module;
var name = fileInfo.name;
var version = fileInfo.version;
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var id = module + "/" + name;
var info = registry.getNodeInfo(id);
var isEnabled = true;
if (info) {
if (info.hasOwnProperty("loaded")) {
throw new Error(file+" already loaded");
}
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isEnabled = info.enabled;
}
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var node = {
id: id,
module: module,
name: name,
file: file,
template: file.replace(/\.js$/,".html"),
enabled: isEnabled,
loaded:false,
version: version
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};
if (fileInfo.hasOwnProperty("types")) {
node.types = fileInfo.types;
}
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fs.readFile(node.template,'utf8', function(err,content) {
if (err) {
node.types = [];
if (err.code === 'ENOENT') {
if (!node.types) {
node.types = [];
}
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node.err = "Error: "+file+" does not exist";
} else {
node.types = [];
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node.err = err.toString();
}
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resolve(node);
} else {
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var types = [];
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var regExp = /<script ([^>]*)data-template-name=['"]([^'"]*)['"]/gi;
var match = null;
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while((match = regExp.exec(content)) !== null) {
types.push(match[2]);
}
node.types = types;
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var langRegExp = /^<script[^>]* data-lang=['"](.+?)['"]/i;
regExp = /(<script[^>]* data-help-name=[\s\S]*?<\/script>)/gi;
match = null;
var mainContent = "";
var helpContent = {};
var index = 0;
while((match = regExp.exec(content)) !== null) {
mainContent += content.substring(index,regExp.lastIndex-match[1].length);
index = regExp.lastIndex;
var help = content.substring(regExp.lastIndex-match[1].length,regExp.lastIndex);
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var lang = "en-US";
if ((match = langRegExp.exec(help)) !== null) {
lang = match[1];
}
if (!helpContent.hasOwnProperty(lang)) {
helpContent[lang] = "";
}
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helpContent[lang] += help;
}
mainContent += content.substring(index);
node.config = mainContent;
node.help = helpContent;
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// TODO: parse out the javascript portion of the template
//node.script = "";
for (var i=0;i<node.types.length;i++) {
if (registry.getTypeId(node.types[i])) {
node.err = node.types[i]+" already registered";
break;
}
}
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fs.stat(path.join(path.dirname(file),"locales"),function(err,stat) {
if (!err) {
node.namespace = node.id;
i18n.registerMessageCatalog(node.id,
path.join(path.dirname(file),"locales"),
path.basename(file,".js")+".json")
.then(function() {
resolve(node);
});
} else {
node.namespace = node.module;
resolve(node);
}
});
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}
});
});
}
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//function getAPIForNode(node) {
// var red = {
// nodes: RED.nodes,
// library: RED.library,
// credentials: RED.credentials,
// events: RED.events,
// log: RED.log,
//
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// }
//
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//}
/**
* Loads the specified node into the runtime
* @param node a node info object - see loadNodeConfig
* @return a promise that resolves to an update node info object. The object
* has the following properties added:
* err: any error encountered whilst loading the node
*
*/
function loadNodeSet(node) {
var nodeDir = path.dirname(node.file);
var nodeFn = path.basename(node.file);
if (!node.enabled) {
return when.resolve(node);
} else {
}
try {
var loadPromise = null;
var r = require(node.file);
if (typeof r === "function") {
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var red = {};
for (var i in RED) {
if (RED.hasOwnProperty(i) && !/^(init|start|stop)$/.test(i)) {
var propDescriptor = Object.getOwnPropertyDescriptor(RED,i);
Object.defineProperty(red,i,propDescriptor);
}
}
red["_"] = function() {
var args = Array.prototype.slice.call(arguments, 0);
args[0] = node.namespace+":"+args[0];
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return i18n._.apply(null,args);
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}
var promise = r(red);
if (promise != null && typeof promise.then === "function") {
loadPromise = promise.then(function() {
node.enabled = true;
node.loaded = true;
return node;
}).otherwise(function(err) {
node.err = err;
return node;
});
}
}
if (loadPromise == null) {
node.enabled = true;
node.loaded = true;
loadPromise = when.resolve(node);
}
return loadPromise;
} catch(err) {
node.err = err;
return when.resolve(node);
}
}
function loadNodeSetList(nodes) {
var promises = [];
nodes.forEach(function(node) {
if (!node.err) {
promises.push(loadNodeSet(node));
} else {
promises.push(node);
}
});
return when.settle(promises).then(function() {
if (settings.available()) {
return registry.saveNodeList();
} else {
return;
}
});
}
function addModule(module) {
if (!settings.available()) {
throw new Error("Settings unavailable");
}
var nodes = [];
if (registry.getModuleInfo(module)) {
// TODO: nls
var e = new Error("module_already_loaded");
e.code = "module_already_loaded";
return when.reject(e);
}
try {
var moduleFiles = localfilesystem.getModuleFiles(module);
return loadNodeFiles(moduleFiles);
} catch(err) {
return when.reject(err);
}
}
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function loadNodeHelp(node,lang) {
var dir = path.dirname(node.template);
var base = path.basename(node.template);
var localePath = path.join(dir,"locales",lang,base);
try {
// TODO: make this async
var content = fs.readFileSync(localePath, "utf8")
return content;
} catch(err) {
return null;
}
}
function getNodeHelp(node,lang) {
if (!node.help[lang]) {
var help = loadNodeHelp(node,lang);
if (help == null) {
var langParts = lang.split("-");
if (langParts.length == 2) {
help = loadNodeHelp(node,langParts[0]);
}
}
if (help) {
node.help[lang] = help;
} else {
node.help[lang] = node.help["en-US"];
}
}
return node.help[lang];
}
module.exports = {
init: init,
load: load,
addModule: addModule,
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loadNodeSet: loadNodeSet,
getNodeHelp: getNodeHelp
}