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taktos/Log.php

Created May 22, 2012 02:15
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PHP tail viewer
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Log.php
<?php
/**
* Require the library
*/
require 'PHPTail.php';
/**
* Initilize a new instance of PHPTail
* @var PHPTail
*/
$tail = new PHPTail("/path/to/log");
/**
* We're getting an AJAX call
*/
if(isset($_GET['ajax'])) {
echo $tail->getNewLines($_GET['lastsize'], $_GET['grep'], $_GET['invert']);
die();
}
/**
* Regular GET/POST call, print out the GUI
*/
$tail->generateGUI();
Raw
PHPTail.php
<?php
class PHPTail {
/**
* Location of the log file we're tailing
* @var string
*/
private $log = "";
/**
* The time between AJAX requests to the server.
*
* Setting this value too high with an extremly fast-filling log will cause your PHP application to hang.
* @var integer
*/
private $updateTime;
/**
* This variable holds the maximum amount of bytes this application can load into memory (in bytes).
* @var string
*/
private $maxSizeToLoad;
/**
*
* PHPTail constructor
* @param string $log the location of the log file
* @param integer $defaultUpdateTime The time between AJAX requests to the server.
* @param integer $maxSizeToLoad This variable holds the maximum amount of bytes this application can load into memory (in bytes). Default is 2 Megabyte = 2097152 byte
*/
public function __construct($log, $defaultUpdateTime = 2000, $maxSizeToLoad = 2097152) {
$this->log = $log;
$this->updateTime = $defaultUpdateTime;
$this->maxSizeToLoad = $maxSizeToLoad;
}
/**
* This function is in charge of retrieving the latest lines from the log file
* @param string $lastFetchedSize The size of the file when we lasted tailed it.
* @param string $grepKeyword The grep keyword. This will only return rows that contain this word
* @return Returns the JSON representation of the latest file size and appended lines.
*/
public function getNewLines($lastFetchedSize, $grepKeyword, $invert) {
/**
* Clear the stat cache to get the latest results
*/
clearstatcache();
/**
* Define how much we should load from the log file
* @var
*/
$fsize = filesize($this->log);
$maxLength = ($fsize - $lastFetchedSize);
/**
* Verify that we don't load more data then allowed.
*/
if($maxLength > $this->maxSizeToLoad) {
return json_encode(array("size" => $fsize, "data" => array("ERROR: PHPTail attempted to load more (".round(($maxLength / 1048576), 2)."MB) then the maximum size (".round(($this->maxSizeToLoad / 1048576), 2)."MB) of bytes into memory. You should lower the defaultUpdateTime to prevent this from happening. ")));
}
/**
* Actually load the data
*/
$data = array();
if($maxLength > 0) {
$fp = fopen($this->log, 'r');
fseek($fp, -$maxLength , SEEK_END);
$data = explode("\n", fread($fp, $maxLength));
}
/**
* Run the grep function to return only the lines we're interested in.
*/
if($invert == 0) {
$data = preg_grep("/$grepKeyword/",$data);
}
else {
$data = preg_grep("/$grepKeyword/",$data, PREG_GREP_INVERT);
}
/**
* If the last entry in the array is an empty string lets remove it.
*/
if(end($data) == "") {
array_pop($data);
}
return json_encode(array("size" => $fsize, "data" => $data));
}
/**
* This function will print out the required HTML/CSS/JS
*/
public function generateGUI() {
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title><?php echo basename($this->log); ?></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<link type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/themes/flick/jquery-ui.css" rel="stylesheet"></link>
<style type="text/css">
#grepKeyword, #settings {
font-size: 80%;
}
.float {
background: white;
border-bottom: 1px solid black;
padding: 10px 0 10px 0;
margin: 0px;
height: 30px;
width: 100%;
text-align: left;
}
#results {
padding-bottom: 10px;
font-family: monospace;
font-size: small;
white-space: pre;
}
</style>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/jquery-ui.min.js"></script>
<script type="text/javascript">
/* <![CDATA[ */
//Last know size of the file
lastSize = <?php echo filesize($this->log); ?>;
//Grep keyword
grep = "";
//Should the Grep be inverted?
invert = 0;
//Last known document height
documentHeight = 0;
//Last known scroll position
scrollPosition = 0;
//Should we scroll to the bottom?
scroll = true;
$(document).ready(function(){
// Setup the settings dialog
$( "#settings" ).dialog({
modal: true,
resizable: false,
draggable: false,
autoOpen: false,
width: 590,
height: 270,
buttons: {
Close: function() {
$( this ).dialog( "close" );
}
},
close: function(event, ui) {
grep = $("#grep").val();
invert = $('#invert input:radio:checked').val();
$("#grepspan").html("Grep keyword: \"" + grep + "\"");
$("#invertspan").html("Inverted: " + (invert == 1 ? 'true' : 'false'));
}
});
//Close the settings dialog after a user hits enter in the textarea
$('#grep').keyup(function(e) {
if(e.keyCode == 13) {
$( "#settings" ).dialog('close');
}
});
//Focus on the textarea
$("#grep").focus();
//Settings button into a nice looking button with a theme
$("#grepKeyword").button();
//Settings button opens the settings dialog
$("#grepKeyword").click(function(){
$( "#settings" ).dialog('open');
$("#grepKeyword").removeClass('ui-state-focus');
});
//Set up an interval for updating the log. Change updateTime in the PHPTail contstructor to change this
setInterval ( "updateLog()", <?php echo $this->updateTime; ?> );
//Some window scroll event to keep the menu at the top
$(window).scroll(function(e) {
if ($(window).scrollTop() > 0) {
$('.float').css({
position: 'fixed',
top: '0',
left: 'auto'
});
} else {
$('.float').css({
position: 'static'
});
}
});
//If window is resized should we scroll to the bottom?
$(window).resize(function(){
if(scroll) {
scrollToBottom();
}
});
//Handle if the window should be scrolled down or not
$(window).scroll(function(){
documentHeight = $(document).height();
scrollPosition = $(window).height() + $(window).scrollTop();
if(documentHeight <= scrollPosition) {
scroll = true;
}
else {
scroll = false;
}
});
scrollToBottom();
});
//This function scrolls to the bottom
function scrollToBottom() {
$('.ui-widget-overlay').width($(document).width());
$('.ui-widget-overlay').height($(document).height());
$("html, body").scrollTop($(document).height());
if($( "#settings" ).dialog("isOpen")) {
$('.ui-widget-overlay').width($(document).width());
$('.ui-widget-overlay').height($(document).height());
$( "#settings" ).dialog("option", "position", "center");
}
}
//This function queries the server for updates.
function updateLog() {
$.getJSON('?ajax=1&lastsize='+lastSize + '&grep='+grep + '&invert='+invert, function(data) {
lastSize = data.size;
$.each(data.data, function(key, value) {
$("#results").append('' + value + '<br/>');
});
if(scroll) {
scrollToBottom();
}
});
}
/* ]]> */
</script>
</head>
<body>
<div id="settings" title="PHPTail settings">
<p>Grep keyword (return results that contain this keyword)</p>
<input id="grep" type="text" value=""/>
<p>Should the grep keyword be inverted? (Return results that do NOT contain the keyword)</p>
<div id="invert">
<input type="radio" value="1" id="invert1" name="invert" /><label for="invert1">Yes</label>
<input type="radio" value="0" id="invert2" name="invert" checked="checked" /><label for="invert2">No</label>
</div>
</div>
<div class="float">
<button id="grepKeyword">Settings</button>
<span>Tailing file: <?php echo $this->log; ?></span> | <span id="grepspan">Grep keyword: ""</span> | <span id="invertspan">Inverted: false</span>
</div>
<div id="results">
</div>
</body>
</html>
<?php
}
}
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