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Caching credentials
===================
You can speed up your API operations by caching your credentials in a
(semi-)permanent location, such as your DB or local filesystem. This
enable subsequent requests to access a shared resource, instead of
repetitively having to re-authenticate on every thread of execution.
Tokens are valid for 24 hours, so you can effectively re-use the same
cached value for that period. If you try to use a cached version that
has expired, an authentication request will be made.
Filesystem example
------------------
In this example, credentials will be saved to a file in the local
filesystem. Be sure to exclude it from your VCS.
.. code-block:: php
use OpenCloud\Rackspace;
$client = new Rackspace(Rackspace::US_IDENTITY_ENDPOINT, array(
'username' => 'foo',
'apiKey' => 'bar'
));
$cacheFile = __DIR__ . '/.opencloud_token';
// If the cache file exists, try importing it into the client
if (file_exists($cacheFile)) {
$data = unserialize(file_get_contents($cacheFile));
$client->importCredentials($data);
}
$token = $client->getTokenObject();
// If no token exists, or the current token is expired, re-authenticate and save the new token to disk
if (!$token || ($token && $token->hasExpired())) {
$client->authenticate();
file_put_contents($cacheFile, serialize($client->exportCredentials()));
}
In tests, the above code shaved about 1-2s off the execution time.