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node-red/nodes/core/storage/50-file.js

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/**
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* Copyright 2013, 2014 IBM Corp.
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*
* 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.
**/
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module.exports = function(RED) {
"use strict";
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var fs = require("fs");
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function FileNode(n) {
RED.nodes.createNode(this,n);
this.filename = n.filename || "";
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this.appendNewline = n.appendNewline;
this.overwriteFile = n.overwriteFile.toString();
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var node = this;
this.on("input",function(msg) {
var filename;
if (msg.filename) {
if (n.filename) {
node.warn("Deprecated: msg properties should not override set node properties. See bit.ly/nr-override-msg-props");
}
filename = msg.filename;
} else {
filename = this.filename;
}
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if (filename === "") {
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node.warn('No filename specified');
} else if (msg.hasOwnProperty('delete')) {
node.warn("Deprecated: please use specific delete option in config dialog.");
fs.unlink(filename, function (err) {
if (err) { node.warn('Failed to delete file : '+err); }
});
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} else if (typeof msg.payload != "undefined") {
var data = msg.payload;
if ((typeof data === "object")&&(!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 === "true") {
// using "binary" not {encoding:"binary"} to be 0.8 compatible for a while
//fs.writeFile(filename, data, {encoding:"binary"}, function (err) {
fs.writeFile(filename, data, "binary", function (err) {
if (err) { node.warn('Failed to write to file : '+err); }
else if (RED.settings.verbose) { node.log('wrote to file: '+filename); }
});
}
else if (this.overwriteFile === "delete") {
fs.unlink(filename, function (err) {
if (err) { node.warn('Failed to delete file : '+err); }
else if (RED.settings.verbose) { node.log("deleted file: "+filename); }
});
}
else {
// using "binary" not {encoding:"binary"} to be 0.8 compatible for a while longer
//fs.appendFile(filename, data, {encoding:"binary"}, function (err) {
fs.appendFile(filename, data, "binary", function (err) {
if (err) { node.warn('Failed to append to file : '+err); }
else if (RED.settings.verbose) { node.log('appended to file: '+filename); }
});
}
}
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});
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}
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RED.nodes.registerType("file",FileNode);
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function FileInNode(n) {
RED.nodes.createNode(this,n);
this.filename = n.filename || "";
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this.format = n.format;
var node = this;
var options = {};
if (this.format) {
options['encoding'] = this.format;
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}
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this.on("input",function(msg) {
var filename;
if (msg.filename) {
if (n.filename) {
node.warn("Deprecated: msg properties should not override set node properties. See bit.ly/nr-override-msg-props");
}
filename = msg.filename;
} else {
filename = this.filename;
}
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if (filename === "") {
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node.warn('No filename specified');
} else {
msg.filename = filename;
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fs.readFile(filename,options,function(err,data) {
if (err) {
node.warn(err);
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msg.error = err;
delete msg.payload;
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} else {
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msg.payload = data;
delete msg.error;
}
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node.send(msg);
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});
}
});
}
RED.nodes.registerType("file in",FileInNode);
}