mirror of
https://github.com/node-red/node-red.git
synced 2023-10-10 13:36:53 +02:00
66 lines
2.0 KiB
JavaScript
66 lines
2.0 KiB
JavaScript
/**
|
|
* Copyright 2013 IBM Corp.
|
|
*
|
|
* 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");
|
|
var spawn = require('child_process').spawn;
|
|
|
|
function TailNode(n) {
|
|
RED.nodes.createNode(this,n);
|
|
|
|
this.filename = n.filename;
|
|
this.split = n.split;
|
|
var node = this;
|
|
|
|
var err = "";
|
|
// TODO: rewrite to use node-tail
|
|
var tail = spawn("tail", ["-F", "-n", "0", this.filename]);
|
|
tail.stdout.on("data", function (data) {
|
|
if (node.split) {
|
|
// TODO: allow customisation of the line break - as we do elsewhere
|
|
var strings = data.toString().split("\n");
|
|
for (var s in strings) {
|
|
//TODO: should we really filter blanks? Is that expected?
|
|
if (strings[s] !== "") {
|
|
node.send({
|
|
topic: node.filename,
|
|
payload: strings[s]
|
|
});
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
var msg = {
|
|
topic:node.filename,
|
|
payload: data.toString()
|
|
};
|
|
node.send(msg);
|
|
}
|
|
});
|
|
|
|
tail.stderr.on("data", function(data) {
|
|
node.warn(data.toString());
|
|
});
|
|
|
|
this.on("close", function() {
|
|
if (tail) { tail.kill(); }
|
|
});
|
|
}
|
|
|
|
RED.nodes.registerType("tail",TailNode);
|
|
}
|