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0d9abbb8b6
Specifically: * in the error case, set msg.filename to be the name of the file used (as is done in the non-error case), * in the error case, delete msg.payload so that subsequent nodes only need check for a msg.payload to act upon if they don't care about error cases, and * in the non-error case, delete msg.error to avoid passing through errors from earlier nodes to a subsequent node that does care about error cases Messages sent will now always have well-defined behaviour with respect to the payload, filename, and error in both error and non-error cases.
96 lines
3.6 KiB
JavaScript
96 lines
3.6 KiB
JavaScript
/**
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* Copyright 2013, 2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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var fs = require("fs");
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function FileNode(n) {
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RED.nodes.createNode(this,n);
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this.filename = n.filename || "";
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this.appendNewline = n.appendNewline;
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this.overwriteFile = n.overwriteFile;
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var node = this;
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this.on("input",function(msg) {
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var filename = msg.filename || this.filename;
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if (filename === "") {
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node.warn('No filename specified');
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} else if (msg.hasOwnProperty('delete')) {
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fs.unlink(filename, function (err) {
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if (err) { node.warn('Failed to delete file : '+err); }
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//console.log('Deleted file",filename);
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});
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} else if (typeof msg.payload != "undefined") {
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var data = msg.payload;
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if (typeof data === "object") {
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if (!Buffer.isBuffer(data)) {
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data = JSON.stringify(data);
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}
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}
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if (typeof data === "boolean") { data = data.toString(); }
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if ((this.appendNewline)&&(!Buffer.isBuffer(data))) { data += "\n"; }
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if (this.overwriteFile) {
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// using "binary" not {encoding:"binary"} to be 0.8 compatible for a while
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fs.writeFile(filename, data, "binary", function (err) {
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if (err) { node.warn('Failed to write to file : '+err); }
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//console.log('Message written to file',filename);
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});
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}
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else {
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// using "binary" not {encoding:"binary"} to be 0.8 compatible for a while
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fs.appendFile(filename, data, "binary", function (err) {
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if (err) { node.warn('Failed to append to file : '+err); }
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//console.log('Message appended to file',filename);
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});
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}
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}
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});
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}
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RED.nodes.registerType("file",FileNode);
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function FileInNode(n) {
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RED.nodes.createNode(this,n);
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this.filename = n.filename || "";
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this.format = n.format;
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var node = this;
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var options = {};
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if (this.format) {
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options['encoding'] = this.format;
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}
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this.on("input",function(msg) {
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var filename = msg.filename || this.filename;
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if (filename === "") {
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node.warn('No filename specified');
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} else {
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msg.filename = filename;
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fs.readFile(filename,options,function(err,data) {
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if (err) {
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node.warn(err);
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msg.error = err;
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delete msg.payload;
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} else {
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msg.payload = data;
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delete msg.error;
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}
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node.send(msg);
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});
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}
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});
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}
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RED.nodes.registerType("file in",FileInNode);
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}
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