[CCSDK-28] populated the seed code for dgbuilder

[ccsdk/distribution.git] / dgbuilder / core_nodes / core / 80-function.js

diff --git a/dgbuilder/core_nodes/core/80-function.js b/dgbuilder/core_nodes/core/80-function.js
new file mode 100644 (file)
index 0000000..e1413a7
--- /dev/null
+++ b/dgbuilder/core_nodes/core/80-function.js
@@ -0,0 +1,79 @@
+/**
+ * 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.
+ **/
+
+module.exports = function(RED) {
+    "use strict";
+    var util = require("util");
+    var vm = require("vm");
+
+    function FunctionNode(n) {
+        RED.nodes.createNode(this,n);
+        this.name = n.name;
+        this.func = n.func;
+        var functionText = "var results = null; results = (function(msg){"+this.func+"\n})(msg);";
+        this.topic = n.topic;
+        var sandbox = {
+            console:console,
+            util:util,
+            Buffer:Buffer,
+            context: {
+                global:RED.settings.functionGlobalContext || {}
+            }
+        };
+        var context = vm.createContext(sandbox);
+        try {
+            this.script = vm.createScript(functionText);
+            this.on("input", function(msg) {
+                try {
+                    var start = process.hrtime();
+                    context.msg = msg;
+                    this.script.runInContext(context);
+                    var results = context.results;
+                    if (results == null) {
+                        results = [];
+                    } else if (results.length == null) {
+                        results = [results];
+                    }
+                    if (msg._topic) {
+                        for (var m in results) {
+                            if (results[m]) {
+                                if (util.isArray(results[m])) {
+                                    for (var n=0; n < results[m].length; n++) {
+                                        results[m][n]._topic = msg._topic;
+                                    }
+                                } else {
+                                    results[m]._topic = msg._topic;
+                                }
+                            }
+                        }
+                    }
+                    this.send(results);
+                    var duration = process.hrtime(start);
+                    if (process.env.NODE_RED_FUNCTION_TIME) {
+                        this.status({fill:"yellow",shape:"dot",text:""+Math.floor((duration[0]* 1e9 +  duration[1])/10000)/100});
+                    }
+                } catch(err) {
+                    this.error(err.toString());
+                }
+            });
+        } catch(err) {
+            this.error(err);
+        }
+    }
+
+    RED.nodes.registerType("function",FunctionNode);
+    RED.library.register("functions");
+}