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MDL-32825 try to improve atomicity of cache file operations in themes and javascript

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This commit is contained in:
Petr Skoda 2012-05-07 17:35:09 +02:00
parent 4dd63b6d70
commit 979d320722
6 changed files with 105 additions and 39 deletions
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36
theme/image.php
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@ -135,24 +135,36 @@ if (empty($imagefile) or !is_readable($imagefile)) {
image_not_found();
}
if ($rev > -1) {
$pathinfo = pathinfo($imagefile);
$cacheimage = "$candidatelocation/$image.".$pathinfo['extension'];
if (!file_exists($cacheimage)) {
if (!file_exists(dirname($cacheimage))) {
// Sometimes there was a race condition in check_dir_exists(),
// so let the next copy() log errors instead.
@mkdir(dirname($cacheimage), $CFG->directorypermissions, true);
}
copy($imagefile, $cacheimage);
}
send_cached_image($cacheimage, $etag);
} else {
send_uncached_image($imagefile);
clearstatcache();
if (!file_exists(dirname($cacheimage))) {
@mkdir(dirname($cacheimage), $CFG->directorypermissions, true);
}
// Prevent serving of incomplete file from concurrent request,
// the rename() should be more atomic than copy().
ignore_user_abort(true);
if (@copy($imagefile, $cacheimage.'.tmp')) {
rename($cacheimage.'.tmp', $cacheimage);
@chmod($cacheimage, $CFG->filepermissions);
@unlink($cacheimage.'.tmp'); // just in case anything fails
}
ignore_user_abort(false);
if (connection_aborted()) {
die;
}
// make sure nothing failed
clearstatcache();
if (file_exists($cacheimage)) {
send_cached_image($cacheimage, $etag);
}
}
send_uncached_image($imagefile);
//=================================================================================
//=== utility functions ==