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node-red/nodes/core/storage/28-tail.js

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/**
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* Copyright 2013,2016 IBM Corp.
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*
* 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.
**/
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module.exports = function(RED) {
"use strict";
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var spawn = require('child_process').spawn;
var plat = require('os').platform();
if (plat.match(/^win/)) {
throw RED._("tail.errors.windowsnotsupport");
}
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function TailNode(n) {
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 = "";
// TODO: rewrite to use node-tail
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) {
// 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]
});
}
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}
}
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else {
msg.payload = data.toString();
node.send(msg);
}
}
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else {
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msg.payload = data;
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node.send(msg);
}
});
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tail.stderr.on("data", function(data) {
node.error(data.toString());
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});
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this.on("close", function() {
/* istanbul ignore else */
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if (tail) { tail.kill(); }
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});
}
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RED.nodes.registerType("tail",TailNode);
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}