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| Viewing file: Select action/file-type: /**
* Copyright JS Foundation and other contributors, http://js.foundation
*
* 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-extra");
var os = require("os");
var path = require("path");
var iconv = require("iconv-lite")
function encode(data, enc) {
if (enc !== "none") {
return iconv.encode(data, enc);
}
return Buffer.from(data);
}
function decode(data, enc) {
if (enc !== "none") {
return iconv.decode(data, enc);
}
return data.toString();
}
function FileNode(n) {
// Write/delete a file
RED.nodes.createNode(this,n);
this.filename = n.filename;
this.appendNewline = n.appendNewline;
this.overwriteFile = n.overwriteFile.toString();
this.createDir = n.createDir || false;
this.encoding = n.encoding || "none";
var node = this;
node.wstream = null;
node.msgQueue = [];
node.closing = false;
node.closeCallback = null;
function processMsg(msg,nodeSend, done) {
var filename = node.filename || msg.filename || "";
var fullFilename = filename;
if (filename && RED.settings.fileWorkingDirectory && !path.isAbsolute(filename)) {
fullFilename = path.resolve(path.join(RED.settings.fileWorkingDirectory,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"));
done();
} else if (node.overwriteFile === "delete") {
fs.unlink(fullFilename, 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}));
}
nodeSend(msg);
}
done();
});
} else if (msg.hasOwnProperty("payload") && (typeof msg.payload !== "undefined")) {
var dir = path.dirname(fullFilename);
if (node.createDir) {
try {
fs.ensureDirSync(dir);
}
catch(err) {
node.error(RED._("file.errors.createfail",{error:err.toString()}),msg);
done();
return;
}
}
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 ((node.appendNewline) && (!Buffer.isBuffer(data))) { data += os.EOL; }
var buf;
if (node.encoding === "setbymsg") {
buf = encode(data, msg.encoding || "none");
}
else { buf = encode(data, node.encoding); }
if (node.overwriteFile === "true") {
var wstream = fs.createWriteStream(fullFilename, { encoding:'binary', flags:'w', autoClose:true });
node.wstream = wstream;
wstream.on("error", function(err) {
node.error(RED._("file.errors.writefail",{error:err.toString()}),msg);
done();
});
wstream.on("open", function() {
wstream.once("close", function() {
nodeSend(msg);
done();
});
wstream.end(buf);
})
return;
}
else {
// Append mode
var recreateStream = !node.wstream || !node.filename;
if (node.wstream && node.wstreamIno) {
// There is already a stream open and we have the inode
// of the file. Check the file hasn't been deleted
// or deleted and recreated.
try {
var stat = fs.statSync(fullFilename);
// File exists - check the inode matches
if (stat.ino !== node.wstreamIno) {
// The file has been recreated. Close the current
// stream and recreate it
recreateStream = true;
node.wstream.end();
delete node.wstream;
delete node.wstreamIno;
}
}
catch(err) {
// File does not exist
recreateStream = true;
node.wstream.end();
delete node.wstream;
delete node.wstreamIno;
}
}
if (recreateStream) {
node.wstream = fs.createWriteStream(fullFilename, { encoding:'binary', flags:'a', autoClose:true });
node.wstream.on("open", function(fd) {
try {
var stat = fs.statSync(fullFilename);
node.wstreamIno = stat.ino;
} catch(err) {
}
});
node.wstream.on("error", function(err) {
node.error(RED._("file.errors.appendfail",{error:err.toString()}),msg);
done();
});
}
if (node.filename) {
// Static filename - write and reuse the stream next time
node.wstream.write(buf, function() {
nodeSend(msg);
done();
});
}
else {
// Dynamic filename - write and close the stream
node.wstream.once("close", function() {
nodeSend(msg);
delete node.wstream;
delete node.wstreamIno;
done();
});
node.wstream.end(buf);
}
}
}
else {
done();
}
}
function processQueue(queue) {
var event = queue[0];
processMsg(event.msg, event.send, function() {
event.done();
queue.shift();
if (queue.length > 0) {
processQueue(queue);
}
else if (node.closing) {
closeNode();
}
});
}
this.on("input", function(msg,nodeSend,nodeDone) {
var msgQueue = node.msgQueue;
msgQueue.push({
msg: msg,
send: nodeSend,
done: nodeDone
})
if (msgQueue.length > 1) {
// pending write exists
return;
}
try {
processQueue(msgQueue);
}
catch (e) {
node.msgQueue = [];
if (node.closing) {
closeNode();
}
throw e;
}
});
function closeNode() {
if (node.wstream) { node.wstream.end(); }
if (node.tout) { clearTimeout(node.tout); }
node.status({});
var cb = node.closeCallback;
node.closeCallback = null;
node.closing = false;
if (cb) {
cb();
}
}
this.on('close', function(done) {
if (node.closing) {
// already closing
return;
}
node.closing = true;
if (done) {
node.closeCallback = done;
}
if (node.msgQueue.length > 0) {
// close after queue processed
return;
}
else {
closeNode();
}
});
}
RED.nodes.registerType("file",FileNode);
function FileInNode(n) {
// Read a file
RED.nodes.createNode(this,n);
this.filename = n.filename;
this.format = n.format;
this.chunk = false;
this.encoding = n.encoding || "none";
this.allProps = n.allProps || false;
if (n.sendError === undefined) {
this.sendError = true;
} else {
this.sendError = n.sendError;
}
if (this.format === "lines") { this.chunk = true; }
if (this.format === "stream") { this.chunk = true; }
var node = this;
this.on("input",function(msg, nodeSend, nodeDone) {
var filename = (node.filename || msg.filename || "").replace(/\t|\r|\n/g,'');
var fullFilename = filename;
if (filename && RED.settings.fileWorkingDirectory && !path.isAbsolute(filename)) {
fullFilename = path.resolve(path.join(RED.settings.fileWorkingDirectory,filename));
}
if (!node.filename) {
node.status({fill:"grey",shape:"dot",text:filename});
}
if (filename === "") {
node.warn(RED._("file.errors.nofilename"));
nodeDone();
}
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 getout = false;
var rs = fs.createReadStream(fullFilename)
.on('readable', function () {
var chunk;
var m;
var hwm = rs._readableState.highWaterMark;
while (null !== (chunk = rs.read())) {
if (node.chunk === true) {
getout = true;
if (node.format === "lines") {
spare += decode(chunk, node.encoding);
var bits = spare.split("\n");
for (var i=0; i < bits.length - 1; i++) {
m = {};
if (node.allProps == true) {
m = RED.util.cloneMessage(msg);
}
else {
m.topic = msg.topic;
m.filename = msg.filename;
}
m.payload = bits[i];
m.parts= {index:count, ch:ch, type:type, id:msg._msgid}
count += 1;
nodeSend(m);
}
spare = bits[i];
}
if (node.format === "stream") {
m = {};
if (node.allProps == true) {
m = RED.util.cloneMessage(msg);
}
else {
m.topic = msg.topic;
m.filename = msg.filename;
}
m.payload = chunk;
m.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;
}
nodeSend(m);
}
}
else {
lines = Buffer.concat([lines,chunk]);
}
}
})
.on('error', function(err) {
node.error(err, msg);
if (node.sendError) {
var sendMessage = RED.util.cloneMessage(msg);
delete sendMessage.payload;
sendMessage.error = err;
nodeSend(sendMessage);
}
nodeDone();
})
.on('end', function() {
if (node.chunk === false) {
if (node.format === "utf8") {
msg.payload = decode(lines, node.encoding);
}
else { msg.payload = lines; }
nodeSend(msg);
}
else if (node.format === "lines") {
var m = {};
if (node.allProps) {
m = RED.util.cloneMessage(msg);
}
else {
m.topic = msg.topic;
m.filename = msg.filename;
}
m.payload = spare;
m.parts = {
index: count,
count: count + 1,
ch: ch,
type: type,
id: msg._msgid
}
nodeSend(m);
}
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} };
nodeSend(m);
}
nodeDone();
});
}
});
this.on('close', function() {
node.status({});
});
}
RED.nodes.registerType("file in",FileInNode);
}
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