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Modify Tail node to only send new messages

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Now with test that works with it.
Part of Issue #326
Now need to redo with libs that support windows.
This commit is contained in:
Dave C-J
2014-08-22 12:44:40 +01:00
parent a8ade083d4
commit ecbf4add6b
4 changed files with 58 additions and 19 deletions
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8
nodes/core/storage/28-tail.html
View File

@@ -16,7 +16,7 @@
<script type="text/x-red" data-template-name="tail">
<div class="form-row node-input-filename">
<label for="node-input-filename"><i class="icon-file"></i> Filename</label>
<label for="node-input-filename"><i class="fa fa-file"></i> Filename</label>
<input type="text" id="node-input-filename" placeholder="Filename">
</div>
<div class="form-row">
@@ -25,15 +25,15 @@
<label for="node-input-split" style="width: 70%;">Split lines if we see \n ?</label>
</div>
<div class="form-row">
<label for="node-input-name"><i class="icon-tag"></i> Name</label>
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
<div class="form-tips">WON'T work on Windows.</div>
<!-- <div class="form-tips">WON'T work on Windows.</div> -->
</script>
<script type="text/x-red" data-help-name="tail">
<p>Tails (watches for things to be added) to the configured file. (Linux/Mac ONLY)</p>
<p>This won't work on Windows filesystems (as it relies on the tail -F command) so we will probably have to hide it in future.</p>
<p>This won't work on Windows filesystems, as it relies on the tail -F command.</p>
</script>
<script type="text/javascript">

9
nodes/core/storage/28-tail.js
View File

@@ -1,5 +1,5 @@
/**
* Copyright 2013 IBM Corp.
* Copyright 2013, 2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -18,6 +18,11 @@ module.exports = function(RED) {
"use strict";
var fs = require("fs");
var spawn = require('child_process').spawn;
var plat = require('os').platform();
if (plat.match(/^win/)) {
throw "Info : Currently not supported on Windows.";
}
function TailNode(n) {
RED.nodes.createNode(this,n);
@@ -28,7 +33,7 @@ module.exports = function(RED) {
var err = "";
// TODO: rewrite to use node-tail
var tail = spawn("tail", ["-F", this.filename]);
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