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

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
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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";
var fs = require("fs-extra");
var os = require("os");
var path = require("path");
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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();
this.createDir = n.createDir || false;
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var node = this;
node.wstream = null;
node.data = [];
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this.on("input",function(msg) {
var filename = node.filename || msg.filename || "";
if ((!node.filename) && (!node.tout)) {
node.tout = setTimeout(function() {
node.status({fill:"grey",shape:"dot",text:filename});
clearTimeout(node.tout);
node.tout = null;
},333);
}
if (filename === "") { node.warn(RED._("file.errors.nofilename")); }
else if (node.overwriteFile === "delete") {
fs.unlink(filename, function (err) {
if (err) { node.error(RED._("file.errors.deletefail",{error:err.toString()}),msg); }
else if (RED.settings.verbose) { node.log(RED._("file.status.deletedfile",{file:filename})); }
});
}
else if (msg.hasOwnProperty("payload") && (typeof msg.payload !== "undefined")) {
var dir = path.dirname(filename);
if (node.createDir) {
fs.ensureDir(dir, function(err) {
if (err) { node.error(RED._("file.errors.createfail",{error:err.toString()}),msg); }
});
}
var data = msg.payload;
if ((typeof data === "object") && (!Buffer.isBuffer(data))) {
data = JSON.stringify(data);
}
if (typeof data === "boolean") { data = data.toString(); }
if (typeof data === "number") { data = data.toString(); }
if ((this.appendNewline) && (!Buffer.isBuffer(data))) { data += os.EOL; }
node.data.push(Buffer.from(data));
while (node.data.length > 0) {
if (this.overwriteFile === "true") {
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node.wstream = fs.createWriteStream(filename, { encoding:'binary', flags:'w', autoClose:true });
node.wstream.on("error", function(err) {
node.error(RED._("file.errors.writefail",{error:err.toString()}),msg);
});
node.wstream.end(node.data.shift());
}
else {
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if ((!node.wstream) || (!node.filename)) {
node.wstream = fs.createWriteStream(filename, { encoding:'binary', flags:'a', autoClose:true });
node.wstream.on("error", function(err) {
node.error(RED._("file.errors.appendfail",{error:err.toString()}),msg);
});
}
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if (node.filename) { node.wstream.write(node.data.shift()); }
else { node.wstream.end(node.data.shift()); }
}
}
}
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});
this.on('close', function() {
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if (node.wstream) { node.wstream.end(); }
if (node.tout) { clearTimeout(node.tout); }
node.status({});
});
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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;
this.chunk = false;
if (this.format === "lines") { this.chunk = true; }
if (this.format === "stream") { this.chunk = true; }
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var node = this;
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this.on("input",function(msg) {
var filename = node.filename || msg.filename || "";
if (!node.filename) {
node.status({fill:"grey",shape:"dot",text:filename});
}
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if (filename === "") {
node.warn(RED._("file.errors.nofilename"));
}
else {
msg.filename = filename;
var lines = Buffer.from([]);
var spare = "";
var count = 0;
var type = "buffer";
var ch = "";
if (node.format === "lines") {
ch = "\n";
type = "string";
}
var hwm;
var getout = false;
var rs = fs.createReadStream(filename)
.on('readable', function () {
var chunk;
var hwm = rs._readableState.highWaterMark;
while (null !== (chunk = rs.read())) {
if (node.chunk === true) {
getout = true;
if (node.format === "lines") {
spare += chunk.toString();
var bits = spare.split("\n");
for (var i=0; i < bits.length - 1; i++) {
var m = {
payload:bits[i],
topic:msg.topic,
filename:msg.filename,
parts:{index:count, ch:ch, type:type, id:msg._msgid}
}
count += 1;
if ((chunk.length < hwm) && (bits[i+1].length === 0)) {
m.parts.count = count;
}
node.send(m);
}
spare = bits[i];
if (chunk.length !== hwm) { getout = false; }
//console.log("LEFT",bits[i].length,bits[i]);
}
if (node.format === "stream") {
var m = {
payload:chunk,
topic:msg.topic,
filename:msg.filename,
parts:{index:count, ch:ch, type:type, id:msg._msgid}
}
count += 1;
if (chunk.length < hwm) { // last chunk is smaller that high water mark = eof
getout = false;
m.parts.count = count;
}
node.send(m);
}
}
else {
lines = Buffer.concat([lines,chunk]);
}
}
})
.on('error', function(err) {
node.error('Error while reading file.', msg);
})
.on('end', function() {
if (node.chunk === false) {
if (node.format === "utf8") { msg.payload = lines.toString(); }
else { msg.payload = lines; }
node.send(msg);
}
else if (getout) { // last chunk same size as high water mark - have to send empty extra packet.
var m = { parts:{index:count, count:count, ch:ch, type:type, id:msg._msgid} };
node.send(m);
}
});
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}
});
this.on('close', function() {
node.status({});
});
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}
RED.nodes.registerType("file in",FileInNode);
}