105 lines
3.5 KiB
JavaScript
105 lines
3.5 KiB
JavaScript
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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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var Tail = require('tail').Tail;
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function TailNode(n) {
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RED.nodes.createNode(this,n);
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this.filename = n.filename || "";
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this.filetype = n.filetype || "text";
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this.split = new RegExp(n.split.replace(/\\r/g,'\r').replace(/\\n/g,'\n').replace(/\\t/g,'\t') || "[\r]{0,1}\n");
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var node = this;
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node.tout = null;
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var fileTail = function() {
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if (fs.existsSync(node.filename)) {
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node.status({ });
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if (node.filetype === "text") {
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node.tail = new Tail(node.filename,{separator:node.split, flushAtEOF:true});
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}
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else {
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node.tail = new Tail(node.filename,{separator:null, flushAtEOF:true, encoding:"binary"});
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}
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node.tail.on("line", function(data) {
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if (data.length > 0) {
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var msg = { topic:node.filename };
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if (node.filetype === "text") {
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msg.payload = data.toString();
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node.send(msg);
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}
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else {
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msg.payload = Buffer.from(data,"binary");
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node.send(msg);
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}
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}
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});
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node.tail.on("error", function(err) {
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node.status({ fill: "red",shape:"ring", text: "node-red:common.status.error" });
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node.error(err.toString());
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if (err.code ==="ENOENT") { scheduleRestart(); }
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});
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}
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else {
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scheduleRestart();
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node.warn(RED._("tail.errors.filenotfound") + ": "+node.filename);
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}
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}
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var scheduleRestart = function() {
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node.tout = setTimeout(function() {
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node.tout = null;
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if (node.tail) { node.tail.unwatch(); }
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delete node.tail;
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fileTail();
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}, 10000);
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};
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var cancelRestart = function() {
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if (isRestartPending()) {
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clearTimeout(node.tout);
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node.tout = null;
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}
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};
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var isRestartPending = function() {
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return node.tout !== null;
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};
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if (node.filename !== "") {
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node.status({});
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fileTail();
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} else {
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node.status({ fill: "grey", text: "tail.state.stopped" });
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node.on('input', function (msg) {
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if (!msg.hasOwnProperty("filename")) {
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node.error(RED._("tail.state.nofilename"));
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} else if (msg.filename === "") {
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node.filename = "";
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if (node.tail) { node.tail.unwatch(); }
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cancelRestart();
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node.status({ fill: "grey", text: "tail.state.stopped" });
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} else {
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node.filename = msg.filename;
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if (node.tail) { node.tail.unwatch(); }
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if (!isRestartPending()) { fileTail(); }
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node.status({ fill: "green", text: node.filename });
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}
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});
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}
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node.on("close", function() {
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/* istanbul ignore else */
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if (node.tail) { node.tail.unwatch(); }
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delete node.tail;
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cancelRestart();
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});
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}
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RED.nodes.registerType("tail",TailNode);
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}
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