mirror of https://github.com/node-red/node-red.git
275 lines
12 KiB
JavaScript
275 lines
12 KiB
JavaScript
/**
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* Copyright JS Foundation and other contributors, http://js.foundation
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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-extra");
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var os = require("os");
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var path = require("path");
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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.toString();
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this.createDir = n.createDir || false;
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var node = this;
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node.wstream = null;
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node.data = [];
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this.on("input",function(msg) {
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var filename = node.filename || msg.filename || "";
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if ((!node.filename) && (!node.tout)) {
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node.tout = setTimeout(function() {
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node.status({fill:"grey",shape:"dot",text:filename});
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clearTimeout(node.tout);
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node.tout = null;
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},333);
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}
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if (filename === "") {
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node.warn(RED._("file.errors.nofilename"));
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} else if (node.overwriteFile === "delete") {
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fs.unlink(filename, function (err) {
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if (err) {
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node.error(RED._("file.errors.deletefail",{error:err.toString()}),msg);
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} else {
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if (RED.settings.verbose) {
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node.log(RED._("file.status.deletedfile",{file:filename}));
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}
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node.send(msg);
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}
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});
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} else if (msg.hasOwnProperty("payload") && (typeof msg.payload !== "undefined")) {
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var dir = path.dirname(filename);
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if (node.createDir) {
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try {
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fs.ensureDirSync(dir);
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} catch(err) {
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node.error(RED._("file.errors.createfail",{error:err.toString()}),msg);
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return;
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}
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}
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var data = msg.payload;
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if ((typeof data === "object") && (!Buffer.isBuffer(data))) {
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data = JSON.stringify(data);
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}
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if (typeof data === "boolean") { data = data.toString(); }
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if (typeof data === "number") { data = data.toString(); }
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if ((node.appendNewline) && (!Buffer.isBuffer(data))) { data += os.EOL; }
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node.data.push({msg:msg,data:Buffer.from(data)});
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while (node.data.length > 0) {
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if (node.overwriteFile === "true") {
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(function(packet) {
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node.wstream = fs.createWriteStream(filename, { encoding:'binary', flags:'w', autoClose:true });
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node.wstream.on("error", function(err) {
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node.error(RED._("file.errors.writefail",{error:err.toString()}),msg);
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});
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node.wstream.on("open", function() {
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node.wstream.end(packet.data, function() {
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node.send(packet.msg);
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});
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})
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})(node.data.shift());
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}
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else {
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// Append mode
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var recreateStream = !node.wstream || !node.filename;
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if (node.wstream && node.wstreamIno) {
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// There is already a stream open and we have the inode
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// of the file. Check the file hasn't been deleted
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// or deleted and recreated.
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try {
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var stat = fs.statSync(filename);
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// File exists - check the inode matches
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if (stat.ino !== node.wstreamIno) {
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// The file has been recreated. Close the current
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// stream and recreate it
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recreateStream = true;
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node.wstream.end();
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delete node.wstream;
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delete node.wstreamIno;
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}
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} catch(err) {
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// File does not exist
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recreateStream = true;
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node.wstream.end();
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delete node.wstream;
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delete node.wstreamIno;
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}
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}
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if (recreateStream) {
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node.wstream = fs.createWriteStream(filename, { encoding:'binary', flags:'a', autoClose:true });
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node.wstream.on("open", function(fd) {
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try {
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var stat = fs.statSync(filename);
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node.wstreamIno = stat.ino;
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} catch(err) {
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}
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});
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node.wstream.on("error", function(err) {
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node.error(RED._("file.errors.appendfail",{error:err.toString()}),msg);
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});
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}
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if (node.filename) {
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// Static filename - write and reuse the stream next time
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var packet = node.data.shift()
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node.wstream.write(packet.data, function() {
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node.send(packet.msg);
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});
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} else {
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// Dynamic filename - write and close the stream
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var packet = node.data.shift()
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node.wstream.end(packet.data, function() {
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node.send(packet.msg);
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});
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delete node.wstream;
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delete node.wstreamIno;
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}
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}
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}
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}
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});
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this.on('close', function() {
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if (node.wstream) { node.wstream.end(); }
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if (node.tout) { clearTimeout(node.tout); }
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node.status({});
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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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this.chunk = false;
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if (n.sendError === undefined) {
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this.sendError = true;
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} else {
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this.sendError = n.sendError;
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}
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if (this.format === "lines") { this.chunk = true; }
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if (this.format === "stream") { this.chunk = true; }
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var node = this;
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this.on("input",function(msg) {
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var filename = node.filename || msg.filename || "";
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if (!node.filename) {
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node.status({fill:"grey",shape:"dot",text:filename});
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}
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if (filename === "") {
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node.warn(RED._("file.errors.nofilename"));
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}
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else {
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msg.filename = filename;
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var lines = Buffer.from([]);
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var spare = "";
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var count = 0;
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var type = "buffer";
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var ch = "";
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if (node.format === "lines") {
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ch = "\n";
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type = "string";
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}
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var hwm;
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var getout = false;
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var rs = fs.createReadStream(filename)
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.on('readable', function () {
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var chunk;
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var hwm = rs._readableState.highWaterMark;
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while (null !== (chunk = rs.read())) {
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if (node.chunk === true) {
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getout = true;
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if (node.format === "lines") {
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spare += chunk.toString();
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var bits = spare.split("\n");
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for (var i=0; i < bits.length - 1; i++) {
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var m = {
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payload:bits[i],
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topic:msg.topic,
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filename:msg.filename,
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parts:{index:count, ch:ch, type:type, id:msg._msgid}
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}
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count += 1;
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node.send(m);
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}
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spare = bits[i];
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}
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if (node.format === "stream") {
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var m = {
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payload:chunk,
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topic:msg.topic,
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filename:msg.filename,
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parts:{index:count, ch:ch, type:type, id:msg._msgid}
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}
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count += 1;
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if (chunk.length < hwm) { // last chunk is smaller that high water mark = eof
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getout = false;
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m.parts.count = count;
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}
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node.send(m);
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}
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}
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else {
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lines = Buffer.concat([lines,chunk]);
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}
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}
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})
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.on('error', function(err) {
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node.error(err, msg);
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if (node.sendError) {
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var sendMessage = RED.util.cloneMessage(msg);
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delete sendMessage.payload;
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sendMessage.error = err;
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node.send(sendMessage);
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}
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})
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.on('end', function() {
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if (node.chunk === false) {
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if (node.format === "utf8") { msg.payload = lines.toString(); }
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else { msg.payload = lines; }
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node.send(msg);
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}
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else if (node.format === "lines") {
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var m = { payload: spare,
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parts: {
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index: count,
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count: count+1,
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ch: ch,
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type: type,
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id: msg._msgid
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}
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};
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node.send(m);
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}
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else if (getout) { // last chunk same size as high water mark - have to send empty extra packet.
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var m = { parts:{index:count, count:count, ch:ch, type:type, id:msg._msgid} };
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node.send(m);
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}
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});
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}
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});
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this.on('close', function() {
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node.status({});
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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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