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node-red/red/nodes.js

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2013-09-05 16:02:48 +02:00
/**
* Copyright 2013 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 events = require("events");
var fs = require("fs");
function getCallerFilename(type) {
//if (type == "summary") {
// var err = new Error();
// console.log(err.stack);
// return null;
//}
// Save original Error.prepareStackTrace
var origPrepareStackTrace = Error.prepareStackTrace;
// Override with function that just returns `stack`
Error.prepareStackTrace = function (_, stack) {
return stack;
}
// Create a new `Error`, which automatically gets `stack`
var err = new Error();
// Evaluate `err.stack`, which calls our new `Error.prepareStackTrace`
var stack = err.stack;
// Restore original `Error.prepareStackTrace`
Error.prepareStackTrace = origPrepareStackTrace;
// Remove superfluous function call on stack
stack.shift();
stack.shift();
return stack[0].getFileName();
}
var registry = (function() {
var nodes = {};
var logHandlers = [];
var obj = {
add: function(n) {
nodes[n.id] = n;
n.on("log",function(msg) {
for (var i in logHandlers) {
logHandlers[i].emit("log",msg);
}
});
},
get: function(i) {
return nodes[i];
},
clear: function() {
for (var n in nodes) {
nodes[n].close();
}
nodes = {};
},
addLogHandler: function(handler) {
logHandlers.push(handler);
}
}
return obj;
})();
var ConsoleLogHandler = new events.EventEmitter();
ConsoleLogHandler.on("log",function(msg) {
util.log("["+msg.level+"] ["+msg.type+":"+(msg.name||msg.id)+"] "+msg.msg);
});
registry.addLogHandler(ConsoleLogHandler);
var node_type_registry = (function() {
var node_types = {};
var node_configs = {};
var obj = {
register: function(type,node) {
util.inherits(node, Node);
var callerFilename = getCallerFilename(type);
if (callerFilename == null) {
util.log("["+type+"] unable to determine filename");
} else {
var configFilename = callerFilename.replace(/\.js$/,".html");
if (fs.existsSync(configFilename)) {
node_types[type] = node;
if (! node_configs[configFilename]) {
node_configs[configFilename] = fs.readFileSync(configFilename,'utf8');
}
} else {
util.log("["+type+"] missing template file: "+configFilename);
}
}
},
get: function(type) {
return node_types[type];
},
registerNodeConfig: function(type,config) {
node_configs[type] = config;
},
getNodeConfigs: function() {
var result = "";
for (var nt in node_configs) {
result += node_configs[nt];
}
return result;
}
}
return obj;
})();
function Node(n) {
this.id = n.id;
registry.add(this);
this.type = n.type;
if (n.name) {
this.name = n.name;
}
this.wires = n.wires||[];
}
util.inherits(Node,events.EventEmitter);
Node.prototype.close = function() {
// called when a node is removed
}
Node.prototype.send = function(msg) {
// instanceof doesn't work for some reason here
if (msg == null) {
msg = [];
} else if (!util.isArray(msg)) {
msg = [msg];
}
for (var i in this.wires) {
var wires = this.wires[i];
if (i < msg.length) {
for (var j in wires) {
if (msg[i] != null) {
var msgs = msg[i];
if (!util.isArray(msg[i])) {
msgs = [msg[i]];
}
for (var k in msgs) {
var mm = msgs[k];
var m = {};
for (var p in mm) {
if (mm.hasOwnProperty(p)) {
m[p] = mm[p];
}
}
var node = registry.get(wires[j]);
if (node) {
node.receive(m);
}
}
}
}
}
}
}
module.exports.Node = Node;
Node.prototype.receive = function(msg) {
this.emit("input",msg);
}
Node.prototype.log = function(msg) {
var o = {level:'log',id:this.id, type:this.type, msg:msg};
if (this.name) o.name = this.name;
this.emit("log",o);
}
Node.prototype.warn = function(msg) {
var o = {level:'warn',id:this.id, type:this.type, msg:msg};
if (this.name) o.name = this.name;
this.emit("log",o);
}
Node.prototype.error = function(msg) {
var o = {level:'error',id:this.id, type:this.type, msg:msg};
if (this.name) o.name = this.name;
this.emit("log",o);
}
var credentials = {};
var credentialsFile = "credentials.json";
if (fs.existsSync(credentialsFile)) {
credentials = JSON.parse(fs.readFileSync(credentialsFile,'utf8'));
}
function saveCredentialsFile() {
fs.writeFile(credentialsFile, JSON.stringify(credentials), function(err) {
if(err) {
util.log(err);
}
});
}
module.exports.addCredentials = function(id,creds) {
credentials[id] = creds;
saveCredentialsFile();
}
module.exports.getCredentials = function(id) {
return credentials[id];
}
module.exports.deleteCredentials = function(id) {
delete credentials[id];
saveCredentialsFile();
}
module.exports.createNode = function(node,def) {
Node.call(node,def);
}
module.exports.registerType = node_type_registry.register;
module.exports.getNodeConfigs = node_type_registry.getNodeConfigs;
module.exports.addLogHandler = registry.addLogHandler;
module.exports.load = function() {
function loadNodes(dir) {
fs.readdirSync(dir).sort().filter(function(fn){
var stats = fs.statSync(dir+"/"+fn);
if (stats.isFile()) {
if (/\.js$/.test(fn)) {
try {
require("../"+dir+"/"+fn);
} catch(err) {
util.log("["+fn+"] "+err);
//console.log(err.stack);
}
}
} else if (stats.isDirectory()) {
// Ignore /.dirs/ and /lib/
if (!/^(\..*|lib)$/.test(fn)) {
loadNodes(dir+"/"+fn);
}
}
});
}
loadNodes("nodes");
}
module.exports.getNode = function(nid) {
return registry.get(nid);
}
module.exports.parseConfig = function(conf) {
registry.clear();
for (var i in conf) {
var nn = null;
var nt = node_type_registry.get(conf[i].type);
if (nt) {
nn = new nt(conf[i]);
}
// console.log(nn);
if (nn == null) {
util.log("[red] unknown type: "+conf[i].type);
}
}
// Clean up any orphaned credentials
var deletedCredentials = false;
for (var c in credentials) {
var n = registry.get(c);
if (!n) {
deletedCredentials = true;
delete credentials[c];
}
}
if (deletedCredentials) {
saveCredentialsFile();
}
}