问题描述

I want google.appengine.ext.blobstore and google.appengine.api.images to work outside of App Engine. Do these modules require App Engine in order to work? I want to create public but not guessable URLs of my images on Google Cloud Storage and serve them via Django.

I read that this is done with google.appengine.ext.blobstore.create_gs_key() and google.appengine.api.images.get_serving_url(). This is what I have so far:

from google.appengine.api import images
from google.appengine.ext import blobstore

bucketname = 'mybucket'

gcs_object_name = '/gs/mybucket/vincent-van-gogh/the-starry-night.jpg'
blob_key = blobstore.create_gs_key(gcs_object_name)
image_url = images.get_serving_url(blob_key)

And image_url is supposed to be a public but not guessable URL of my image. If I run this code, the error is

AssertionError: No api proxy found for service "blobstore"

This suggests blobstore needs a proxy, aka App Engine, in order to work its magic. Can App Engine modules work outside of App Engine? The docs say the above is a powerful way to serve images because I can generate a URL for each image and also resize the image dynamically.

Will this strategy work or is there a better way to serve images from Google Cloud Storage with Django?

The blobstore and images APIs are available only within the App Engine runtime environment. To run them inside compute engine you can:

• Run them inside Managed VMs (the GAE runtime environment on GCE)

• Run them on your own infrastructure or GCE using a GAE API emulator (such as AppScale)

• Use public APIs (such as Google Cloud Storage) instead

Some App Engine services (such as Datastore) now also expose public APIs that you can use from GCE.

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