mirror of https://github.com/node-red/node-red.git
76 lines
2.4 KiB
JavaScript
76 lines
2.4 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 spawn = require('child_process').spawn;
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var plat = require('os').platform();
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if (plat.match(/^win/)) {
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throw RED._("tail.errors.windowsnotsupport");
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}
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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 = n.split || false;
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var node = this;
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var err = "";
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// TODO: rewrite to use node-tail
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var tail = spawn("tail", ["-F", "-n", "0", this.filename]);
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tail.stdout.on("data", function (data) {
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var msg = { topic:node.filename };
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if (node.filetype === "text") {
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if (node.split) {
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// TODO: allow customisation of the line break - as we do elsewhere
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var strings = data.toString().split("\n");
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for (var s in strings) {
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//TODO: should we really filter blanks? Is that expected?
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if (strings[s] !== "") {
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node.send({
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topic: node.filename,
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payload: strings[s]
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});
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}
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}
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}
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else {
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msg.payload = data.toString();
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node.send(msg);
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}
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}
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else {
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msg.payload = data;
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node.send(msg);
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}
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});
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tail.stderr.on("data", function(data) {
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node.error(data.toString());
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});
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this.on("close", function() {
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/* istanbul ignore else */
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if (tail) { tail.kill(); }
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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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