升级到 GAE3 时替换 google.appengine.api 导入模块

Question

We're moving from GAE 2 (standard) to 3. On GAE2 we used:

from google.appengine.api import modules

CountryClient.COUNTRY_REALTIME_HOST = modules.get_hostname('api-country')

How can I do it on GAE3, considering that google.appengine.api not is available?

Answer 1

There is no direct equivalent to the google.appengine.api.modules libraries in the Python 3 runtime for App Engine Standard.

However, as a workaround, you can use a combination of the App Engine Admin API and the default runtime environment variables .

As stated here :

The Modules API is not supported on Python 3. You can use a combination of environment variables and the App Engine Admin API to obtain information about and modify your application's running services:

As you are calling the modules.get_hostname with a module name (or service name, as now modules are usually referred as services), you could use the apps.services.get API call to retrieve which is the version handling all of the traffic, and then the apps.services.versions.instances.list API call to retrieve which is the instance name handling all of the traffic. Then you could build the Hosname as such:

<Instance-ID>.<version.ID>.<service-ID>.<App-ID>.appspot.com

(Or if you are using a custom domain, you can replace the appspot.com domain with it.)