I'm upload multiple images inside Picture(like folder) under Google Cloud Storage bucket.
Eg. Picture/a.jpg, Picture/b.jpg, Pictuer/c.jpg, .....
Now, I want to directly show those multiple images from Cloud Storage into my cakephp 2.x web application as a list.
According to Google Cloud Storage documentation, to access each object inside bucket, Signed URLs must be generated. So, I created signed URLs for each object based on my selecting data from database. Following is my sample code.
<?php
# Imports the Google Cloud client library
use Google\Cloud\Storage\StorageClient;
use Google\Cloud\Core\Exception\GoogleException;
function index() {
//$rsl = 'select data from database';
for($i=0; $i<$count; $i++) {
# create url to access image from google cloud storage
$file_path = $rsl[$i]['pic']['file_path'];
if(!empty($file_path)) {
$rsl[$i]['pic']['real_path'] = $this->get_object_v4_signed_url($file_path);
} else {
$rsl[$i]['pic']['real_path'] = '';
}
}
}
/**
* Generate a v4 signed URL for downloading an object.
*
* @param string $bucketName the name of your Google Cloud bucket.
* @param string $objectName the name of your Google Cloud object.
*
* @return void
*/
function get_object_v4_signed_url($objectName) {
$cloud = parent::connect_to_google_cloud_storage();
$storage = $cloud[0];
$bucketName = $cloud[1];
$bucket = $storage->bucket($bucketName);
$object = $bucket->object($objectName);
if($object->exists()) {
$url = $object->signedUrl(
# This URL is valid for 1 minutes
new \DateTime('1 min'),
[
'version' => 'v4'
]
);
} else {
$url = '';
}
return $url;
}
?>
The problem is, it takes too long to generate because each file is generated to v4 signed URL. When I read Google Cloud Storage documentation, I didn't see to generate v4 signed URL of multiple objects at once(may be I'm wrong). So, is there anyway to speed it up this generating process?
As you mention there is no explanation in the Google Cloud Storage documentation on how to generate signed URLs for multiple objects using PHP as you do. However, I have found that using the gsutil signurl command, you can specify multiple paths or even use a wildcard:
gsutil signurl -d 1m ~/sandbox/key.json gs://bucket_name/object_1.jpg gs://bucket_name/object_2.jpg ...
gsutil signurl -d 1m ~/sandbox/key.json gs://bucket_name/*
This is specified in the gsutil help signurl page: "Multiple gs:// urls may be provided and may contain wildcards. A signed url will be produced for each provided url, authorized for the specified HTTP method and valid for the given duration."
Another option could be using multi-threading in your APP, here you'll find how to perform multi-threading using the pthreads API. If you choose to use this API you should bear in mind (from the documentation):
Warning The pthreads extension cannot be used in a web server environment. Threading in PHP is therefore restricted to CLI-based applications only.
Warning pthreads (v3) can only be used with PHP 7.2+: This is due to ZTS mode being unsafe in 7.0 and 7.1.
But since you have a web APP, I think that neither of those solutions would be useful for you. Besides that you could try using Cloud Functions to generate the signed URLs.