How to access datastore in another project?

[haotung]

I tried to access datastore in another project. I have downloaded credentials JSON file and put it into credentials folder.

Here is my code:

putenv('GOOGLE_APPLICATION_CREDENTIALS=credentials/my-another-project.json');
require_once('php-gds-master/vendor/autoload.php');
$obj_gateway_remote = new \GDS\Gateway\RESTv1('my-another-project');

$obj_store = new GDS\Store('device', $obj_gateway_remote);
$deviceEntities = $obj_store->fetchPage(20);
print_r($deviceEntities);

And I got the error:

PHP Fatal error: Uncaught exception 'InvalidArgumentException' with message 'json key is missing the type field' in /base/data/home/apps/s~ht-courses/1.396256133006308724/php-gds-master/vendor/google/auth/src/CredentialsLoader.php:118

Please tell me any steps I missed. Thank you.

[haotung]

I found that I downloaded wrong JSON file.
The correct JSON file should be downloaded from "IAM & Admin -> Server Accounts -> App Engine default service account -> Create Key
Furthermore, "php_sapi_name" function should be enabled in php.ini

However, the program always gets no errors but "exceeded the maximum execution time".

Does anyone have the same experience?

[tomwalder]

Where are you running the code?

App Engine? Compute Engine?

[haotung]

I run it on App Engine.

[tomwalder]

Sounds like this is related to #135

Generally, running on AppEngine, you would be expected to use the Protocol Buffer API & Gateway.

And also, access the "current" project - although I have not tried to access a different project with the Protocol Buffer API, it may well be possible.