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Added feature to try and cache the CSS and Javascript files by default.

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This reduces the total number of HTTP requests (and hopefully
allows the site to load faster).
This commit is contained in:
green-ponies (jgen) 2011-09-11 21:24:18 -04:00
parent 808e477f34
commit 6e7789c40b
1 changed files with 114 additions and 11 deletions
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125
core/page.class.php
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@ -200,29 +200,132 @@ class Page {
break;
}
}
protected function add_auto_html_headers() {
$data_href = get_base_href();
foreach(glob("lib/*.css") as $css) {
$this->add_html_header("<link rel='stylesheet' href='$data_href/$css' type='text/css'>");
/* Attempt to cache the CSS & JavaScript files */
if ($this->add_cached_auto_html_headers() === FALSE) {
// caching failed, add all files to html_headers.
foreach(glob("lib/*.css") as $css) {
$this->add_html_header("<link rel='stylesheet' href='$data_href/$css' type='text/css'>");
}
$css_files = glob("ext/*/style.css");
if($css_files) {
foreach($css_files as $css_file) {
$this->add_html_header("<link rel='stylesheet' href='$data_href/$css_file' type='text/css'>");
}
}
foreach(glob("lib/*.js") as $js) {
$this->add_html_header("<script src='$data_href/$js' type='text/javascript'></script>");
}
$js_files = glob("ext/*/script.js");
if($js_files) {
foreach($js_files as $js_file) {
$this->add_html_header("<script src='$data_href/$js_file' type='text/javascript'></script>");
}
}
}
$css_files = glob("ext/*/style.css");
if($css_files) {
foreach($css_files as $css_file) {
$this->add_html_header("<link rel='stylesheet' href='$data_href/$css_file' type='text/css'>");
}
/*
This function caches the CSS and JavaScript files.
This is done to reduce the number of HTTP requests (recommended by
the Yahoo high-performance guidelines). It combines all of the CSS
and JavaScript files into one for each type, and stores them in
cached files to serve the client. Changes to the CSS or JavaScript
files are caught by taking the md5sum of the concatenated files.
*/
private function add_cached_auto_html_headers()
{
$cache_location = 'data/cache/';
$data_href = get_base_href();
if(!file_exists($cache_location)) {
if (!mkdir($cache_location, 0750, true)) {
return false; // failed to create directory
}
}
foreach(glob("lib/*.js") as $js) {
$this->add_html_header("<script src='$data_href/$js' type='text/javascript'></script>");
/* ----- CSS Files ----- */
// First get all the CSS from the lib directory
$data_1 = '';
$css_files = glob("lib/*.css");
if($css_files) {
foreach($css_files as $css_file) {
$data_1 .= file_get_contents($css_file);
}
// Can't directly cache the CSS files, as they might have relative locations to images, etc. in them.
// We have to adjust the URLs accordingly before saving the cached file.
$pattern = '/url[\s]*\([\s]*["\']?([^"\'\)]+)["\']?[\s]*\)/';
$replace = 'url("../../lib/${1}")';
$data_1 = preg_replace($pattern, $replace, $data_1);
}
// Next get all the CSS from the extensions
$data_2 = '';
$css_files = glob("ext/*/style.css");
if($css_files) {
foreach($css_files as $css_file) {
$data_2 .= file_get_contents($css_file);
}
// Can't directly cache the CSS files, as they might have relative locations to images, etc. in them.
// We have to adjust the URLs accordingly before saving the cached file.
$pattern = '/url[\s]*\([\s]*["\']?([^"\'\)]+)["\']?[\s]*\)/';
$replace = 'url("../../${1}")';
$data_2 = preg_replace($pattern, $replace, $data_2);
}
// Combine the two
$data = $data_1 . $data_2;
// compute the MD5 sum of the concatenated CSS files
$md5sum = md5($data);
if (!file_exists($cache_location.$md5sum.'.css')) {
// remove any old cached CSS files.
$mask = '*.css';
array_map( 'unlink', glob( $mask ) );
// output the combined file
if (file_put_contents($cache_location.$md5sum.'.css', $data, LOCK_EX) === FALSE) {
return false;
}
}
// tell the client where to get the css cache file
$this->add_html_header('<link rel="stylesheet" href="'.$data_href.'/'.$cache_location.$md5sum.'.css'.'" type="text/css">');
/* ----- JavaScript Files ----- */
$data = '';
$js_files = glob("lib/*.js");
if($js_files) {
foreach($js_files as $js_file) {
$data .= file_get_contents($js_file);
}
}
$js_files = glob("ext/*/script.js");
if($js_files) {
foreach($js_files as $js_file) {
$this->add_html_header("<script src='$data_href/$js_file' type='text/javascript'></script>");
$data .= file_get_contents($js_file);
}
}
// compute the MD5 sum of the concatenated JavaScript files
$md5sum = md5($data);
if (!file_exists($cache_location.$md5sum.'.js')) {
// remove any old cached js files.
$mask = '*.js';
array_map( 'unlink', glob( $mask ) );
// output the combined file
if (file_put_contents($cache_location.$md5sum.'.js', $data, LOCK_EX) === FALSE) {
return false;
}
}
// tell the client where to get the js cache file
$this->add_html_header('<script src="'.$data_href.'/'.$cache_location.$md5sum.'.js'.'" type="text/javascript"></script>');
return true;
}
}
?>