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node-red/red/nodes/registry.js
2014-08-03 21:17:24 +01:00

420 lines
13 KiB
JavaScript

/**
* Copyright 2014 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 util = require("util");
var when = require("when");
var whenNode = require('when/node');
var fs = require("fs");
var path = require("path");
var crypto = require("crypto");
var cheerio = require("cheerio");
var UglifyJS = require("uglify-js");
var events = require("../events");
var Node;
var settings;
function filterNodeInfo(n) {
var r = {
id: n.id,
types: n.types,
name: n.name,
enabled: n.enabled
}
if (n.err) {
r.err = n.err.toString();
}
return r;
}
var registry = (function() {
var nodeConfigCache = null;
var nodeConfigs = {};
var nodeList = [];
var nodeConstructors = {};
return {
addNodeSet: function(id,set) {
nodeConfigs[id] = set;
nodeList.push(id);
},
getNodeSet: function(id) {
return nodeConfigs[id];
},
getNodeList: function() {
return nodeList.map(function(id) {
var n = nodeConfigs[id];
return filterNodeInfo(n);
});
},
registerNodeConstructor: function(type,constructor) {
if (nodeConstructors[type]) {
throw new Error(type+" already registered");
}
util.inherits(constructor,Node);
nodeConstructors[type] = constructor;
events.emit("type-registered",type);
},
/**
* Gets all of the node template configs
* @return all of the node templates in a single string
*/
getAllNodeConfigs: function() {
if (!nodeConfigCache) {
var result = "";
var script = "";
for (var i=0;i<nodeList.length;i++) {
var config = nodeConfigs[nodeList[i]];
if (config.enabled) {
result += config.config;
script += config.script;
}
}
result += '<script type="text/javascript">';
result += UglifyJS.minify(script, {fromString: true}).code;
result += '</script>';
nodeConfigCache = result;
}
return nodeConfigCache;
},
getNodeConfig: function(id) {
var config = nodeConfigs[id];
if (config) {
var result = config.config;
result += '<script type="text/javascript">'+config.script+'</script>';
return result;
} else {
return null;
}
},
getNodeConstructor: function(type) {
return nodeConstructors[type];
},
clear: function() {
nodeConfigCache = null;
nodeConfigs = {};
nodeList = [];
nodeConstructors = {};
}
}
})();
function init(_settings) {
Node = require("./Node");
settings = _settings;
}
/**
* Synchronously walks the directory looking for node files.
* Emits 'node-icon-dir' events for an icon dirs found
* @param dir the directory to search
* @return an array of fully-qualified paths to .js files
*/
function getNodeFiles(dir) {
var result = [];
var files = [];
try {
files = fs.readdirSync(dir);
} catch(err) {
return result;
}
files.sort();
files.forEach(function(fn) {
var stats = fs.statSync(path.join(dir,fn));
if (stats.isFile()) {
if (/\.js$/.test(fn)) {
var valid = true;
if (settings.nodesExcludes) {
for (var i=0;i<settings.nodesExcludes.length;i++) {
if (settings.nodesExcludes[i] == fn) {
valid = false;
break;
}
}
}
if (valid) {
result.push(path.join(dir,fn));
}
}
} else if (stats.isDirectory()) {
// Ignore /.dirs/, /lib/ /node_modules/
if (!/^(\..*|lib|icons|node_modules|test)$/.test(fn)) {
result = result.concat(getNodeFiles(path.join(dir,fn)));
} else if (fn === "icons") {
events.emit("node-icon-dir",path.join(dir,fn));
}
}
});
return result;
}
/**
* Scans the node_modules path for nodes
* @param moduleName the name of the module to be found
* @return a list of node modules: {dir,package}
*/
function scanTreeForNodesModules(moduleName) {
var dir = __dirname+"/../../nodes";
var results = [];
var up = path.resolve(path.join(dir,".."));
while (up !== dir) {
var pm = path.join(dir,"node_modules");
try {
var files = fs.readdirSync(pm);
files.forEach(function(fn) {
if (!moduleName || fn == moduleName) {
var pkgfn = path.join(pm,fn,"package.json");
try {
var pkg = require(pkgfn);
if (pkg['node-red']) {
var moduleDir = path.join(pm,fn);
results.push({dir:moduleDir,package:pkg});
}
} catch(err) {
if (err.code != "MODULE_NOT_FOUND") {
// TODO: handle unexpected error
}
}
}
});
} catch(err) {
}
dir = up;
up = path.resolve(path.join(dir,".."));
}
return results;
}
/**
* Loads the nodes provided in an npm package.
* @param moduleDir the root directory of the package
* @param pkg the module's package.json object
*/
function loadNodesFromModule(moduleDir,pkg) {
var nodes = pkg['node-red'].nodes||{};
var results = [];
var iconDirs = [];
for (var n in nodes) {
if (nodes.hasOwnProperty(n)) {
var file = path.join(moduleDir,nodes[n]);
results.push(loadNodeConfig(file,pkg.name+":"+n));
var iconDir = path.join(moduleDir,path.dirname(nodes[n]),"icons");
if (iconDirs.indexOf(iconDir) == -1) {
if (fs.existsSync(iconDir)) {
events.emit("node-icon-dir",iconDir);
iconDirs.push(iconDir);
}
}
}
}
return results;
}
/**
* Loads a node's configuration
* @param file the fully qualified path of the node's .js file
* @param name the name of the node
* @return the node object
* {
* id: a unqiue id for the node file
* name: the name of the node file, or label from the npm module
* file: the fully qualified path to the node's .js file
* template: the fully qualified path to the node's .html file
* config: the non-script parts of the node's .html file
* script: the script part of the node's .html file
* types: an array of node type names in this file
* }
*/
function loadNodeConfig(file,name) {
var id = crypto.createHash('sha1').update(file).digest("hex");
if (registry.getNodeSet(id)) {
throw new Error(file+" already loaded");
}
var node = {
id: id,
file: file,
name: name||path.basename(file),
template: file.replace(/\.js$/,".html"),
enabled: true
}
var content = fs.readFileSync(node.template,'utf8');
var $ = cheerio.load(content);
var template = "";
var script = "";
var types = [];
$("*").each(function(i,el) {
if (el.type == "script" && el.attribs.type == "text/javascript") {
script += el.children[0].data;
} else if (el.name == "script" || el.name == "style") {
if (el.attribs.type == "text/x-red" && el.attribs['data-template-name']) {
types.push(el.attribs['data-template-name'])
}
var openTag = "<"+el.name;
var closeTag = "</"+el.name+">";
for (var j in el.attribs) {
if (el.attribs.hasOwnProperty(j)) {
openTag += " "+j+'="'+el.attribs[j]+'"';
}
}
openTag += ">";
template += openTag+$(el).text()+closeTag;
}
});
node.types = types;
node.config = template;
node.script = script;
registry.addNodeSet(id,node);
return node;
}
/**
* Loads all palette nodes
* @param defaultNodesDir optional parameter, when set, it overrides the default
* location of nodeFiles - used by the tests
* @return a promise that resolves on completion of loading
*/
function load(defaultNodesDir,disableNodePathScan) {
return when.promise(function(resolve,reject) {
// Find all of the nodes to load
var nodeFiles;
if(defaultNodesDir) {
nodeFiles = getNodeFiles(path.resolve(defaultNodesDir));
} else {
nodeFiles = getNodeFiles(__dirname+"/../../nodes");
}
if (settings.nodesDir) {
var dir = settings.nodesDir;
if (typeof settings.nodesDir == "string") {
dir = [dir];
}
for (var i=0;i<dir.length;i++) {
nodeFiles = nodeFiles.concat(getNodeFiles(dir[i]));
}
}
var nodes = [];
nodeFiles.forEach(function(file) {
nodes.push(loadNodeConfig(file));
});
// TODO: disabling npm module loading if defaultNodesDir set
// This indicates a test is being run - don't want to pick up
// unexpected nodes.
// Urgh.
if (!disableNodePathScan) {
// Find all of the modules containing nodes
var moduleFiles = scanTreeForNodesModules();
moduleFiles.forEach(function(moduleFile) {
nodes = nodes.concat(loadNodesFromModule(moduleFile.dir,moduleFile.package));
});
}
var promises = [];
nodes.forEach(function(node) {
promises.push(loadNodeModule(node));
});
//resolve([]);
when.settle(promises).then(function(results) {
// Trigger a load of the configs to get it precached
registry.getAllNodeConfigs();
resolve();
});
});
}
/**
* 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 loadNodeModule(node) {
var nodeDir = path.dirname(node.file);
var nodeFn = path.basename(node.file);
try {
var loadPromise = null;
var r = require(node.file);
if (typeof r === "function") {
var promise = r(require('../red'));
if (promise != null && typeof promise.then === "function") {
loadPromise = promise.then(function() {
node.enabled = true;
return node;
}).otherwise(function(err) {
node.err = err;
node.enabled = false;
return node;
});
}
}
if (loadPromise == null) {
node.enabled = true;
loadPromise = when.resolve(node);
}
return loadPromise;
} catch(err) {
node.err = err;
node.enabled = false;
return when.resolve(node);
}
}
function loadNode(file) {
var info = null;
try {
info = loadNodeConfig(file);
} catch(err) {
return when.reject(err);
}
return loadNodeModule(info).then(function(info) {
return filterNodeInfo(info);
});
}
module.exports = {
init:init,
load:load,
clear: registry.clear,
registerType: registry.registerNodeConstructor,
get: registry.getNodeConstructor,
getNodeList: registry.getNodeList,
getNodeConfigs: registry.getAllNodeConfigs,
getNodeConfig: registry.getNodeConfig,
loadNode: loadNode
}