[CCSDK-28] populated the seed code for dgbuilder

[ccsdk/distribution.git] / dgbuilder / core_nodes / storage / 50-file.js

diff --git a/dgbuilder/core_nodes/storage/50-file.js b/dgbuilder/core_nodes/storage/50-file.js
new file mode 100644 (file)
index 0000000..d6cc441
--- /dev/null
+++ b/dgbuilder/core_nodes/storage/50-file.js
@@ -0,0 +1,93 @@
+/**
+ * Copyright 2013, 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.
+ **/
+
+module.exports = function(RED) {
+    "use strict";
+    var fs = require("fs");
+
+    function FileNode(n) {
+        RED.nodes.createNode(this,n);
+        this.filename = n.filename || "";
+        this.appendNewline = n.appendNewline;
+        this.overwriteFile = n.overwriteFile;
+        var node = this;
+        this.on("input",function(msg) {
+            var filename = msg.filename || this.filename;
+            if (filename === "") {
+                node.warn('No filename specified');
+            } else if (msg.hasOwnProperty('delete')) {
+                fs.unlink(filename, function (err) {
+                    if (err) { node.warn('Failed to delete file : '+err); }
+                    //console.log('Deleted file",filename);
+                });
+            } else if (typeof msg.payload != "undefined") {
+                var data = msg.payload;
+                if (typeof data === "object") {
+                    if (!Buffer.isBuffer(data)) {
+                        data = JSON.stringify(data);
+                    }
+                }
+                if (typeof data === "boolean") { data = data.toString(); }
+                if ((this.appendNewline)&&(!Buffer.isBuffer(data))) { data += "\n"; }
+                if (this.overwriteFile) {
+                    // using "binary" not {encoding:"binary"} to be 0.8 compatible for a while
+                    fs.writeFile(filename, data, "binary", function (err) {
+                        if (err) { node.warn('Failed to write to file : '+err); }
+                        //console.log('Message written to file',filename);
+                    });
+                }
+                else {
+                    // using "binary" not {encoding:"binary"} to be 0.8 compatible for a while
+                    fs.appendFile(filename, data, "binary", function (err) {
+                        if (err) { node.warn('Failed to append to file : '+err); }
+                        //console.log('Message appended to file',filename);
+                    });
+                }
+            }
+        });
+    }
+    RED.nodes.registerType("file",FileNode);
+
+    function FileInNode(n) {
+        RED.nodes.createNode(this,n);
+
+        this.filename = n.filename || "";
+        this.format = n.format;
+        var node = this;
+        var options = {};
+        if (this.format) {
+            options['encoding'] = this.format;
+        }
+        this.on("input",function(msg) {
+            var filename = msg.filename || this.filename;
+            if (filename === "") {
+                node.warn('No filename specified');
+            } else {
+                fs.readFile(filename,options,function(err,data) {
+                    if (err) {
+                        node.warn(err);
+                        msg.error = err;
+                    } else {
+                        msg.filename = filename;
+                        msg.payload = data;
+                    }
+                    node.send(msg);
+                });
+            }
+        });
+    }
+    RED.nodes.registerType("file in",FileInNode);
+}