Pagination on Google App Engine Standard

Datastore (Google App Engine) does not let you lock the database. So how do you map across every element in Datastore? Here is a very rough and tumble solution to that problem.

Usage

Assume you have a ndb.Model named Widget

Begin pagination using the following (note that Widget is case sensitive)

curl https://example-domain.appspot.com/paginate/Widget
# => {'keys': [<URLSAFEKEYS>], 'cursor': <CURSOR_VALUE>}`.

Use <CURSOR_VALUE> to continue pagination across all Widget's

curl https://example-domain.appspot.com/paginate/Widget/<CURSOR_VALUE>

Code

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