[英]check if object exists in Cloud Files (PHP API)
I've just started working with the PHP API for Rackspace Cloud Files.我刚刚开始为 Rackspace 云文件使用 PHP API。 So far so good-- but I am using it as sort of a poor man's memcache, storing key/value pairs of serialized data.
到目前为止一切都很好——但我将它用作一种穷人的内存缓存,存储序列化数据的键/值对。
My app attempts to grab the existing cached object by its key ('name' in the API language) using something like this:我的应用程序尝试使用以下内容通过其键(API 语言中的“名称”)获取现有缓存的 object:
$obj = $this->container->get_object($key);
The problem is, if the object doesn't exist, the API throws a fatal error rather than simply returning false
.问题是,如果 object 不存在,则 API 会引发致命错误,而不是简单地返回
false
。 The "right" way to do this by the API would probably be to do a API 执行此操作的“正确”方法可能是执行
$objs = $this->container->list_objects();
and then check for my $key
value in that list.然后在该列表中检查我的
$key
值。 However, this seems way more time/CPU intensive than just returning false
from the get_object
request.但是,这似乎比仅从
get_object
请求返回false
更耗费时间/CPU。
Is there a way to do a "search for object" or "check if object exists" in Cloud Files?有没有办法在云文件中进行“搜索对象”或“检查 object 是否存在”?
Thanks谢谢
I sent them a pull request and hope it'll get included.我向他们发送了一个拉取请求,并希望它会被包括在内。
https://github.com/rackspace/php-cloudfiles/pull/35 https://github.com/rackspace/php-cloudfiles/pull/35
My pull-request includes an example, for you it would be similar to this:我的拉取请求包含一个示例,对您而言,它类似于:
$object = new CF_Object($this->container, 'key');
if ($object->exists() === false) {
echo "The object '{$object->name}' does not exist.";
}
I have more general way to check if object exists:我有更通用的方法来检查 object 是否存在:
try {
$this->_container->get_object($path);
$booExists = true;
} catch (Exception $e) {
$booExists = false;
}
If you dump the $object, you'll see that content_length is zero.如果您转储 $object,您将看到 content_length 为零。 Or, last modified will be a zero length string.
或者,最后修改的将是一个零长度的字符串。
Example:例子:
$object = new CF_Object($container, 'thisdocaintthere.pdf');
print_r($object->content_length);
There is also, deep in the dumped parent object, a 404 that will return, but it's private, so you'd need to some hackin' to get at it.还有,在倾倒的父 object 的深处,一个 404 会返回,但它是私有的,所以你需要一些 hackin 才能得到它。
To see this, do the following:要查看此内容,请执行以下操作:
$object = new CF_Object($container, 'thisdocaintthere.pdf');
print_r($object->container->cfs_http);
You'll see inside that object a response_status that is 404你会在里面看到 object 的 response_status 是 404
[response_status:CF_Http:private] => 404
I know I'm a little late to the party, but hopefully this will help someone in the future: you can use the objectExists()
method to test if an object is available.我知道我参加聚会有点晚了,但希望这对将来的某人有所帮助:您可以使用
objectExists()
方法来测试 object 是否可用。
public static function getObject($container, $filename, $expirationTime = false)
{
if ($container->objectExists($filename)) {
$object = $container->getPartialObject($filename);
// return a private, temporary url
if ($expirationTime) {
return $object->getTemporaryUrl($expirationTime, 'GET');
}
// return a public url
return $object->getPublicUrl();
}
// object does not exist
return '';
}
Use like...像使用...
// public CDN file
$photo = self::getObject($container, 'myPublicfile.jpg');
// private file; temporary link expires after 60 seconds
$photo = self::getObject($container, 'myPrivatefile.jpg', 60);
If you do not want to import opencloud to perform this check you can use the following:如果您不想导入 opencloud 来执行此检查,您可以使用以下命令:
$url = 'YOUR CDN URL';
$code = FALSE;
$options['http'] = array(
'method' => "HEAD",
'ignore_errors' => 1,
'max_redirects' => 0
);
$body = file_get_contents($url, NULL, stream_context_create($options));
sscanf($http_response_header[0], 'HTTP/%*d.%*d %d', $code);
if($code!='200') {
echo 'failed';
} else {
echo 'exists';
}
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