google_cloud_storage_example.py

from google.appengine.api import urlfetch, files
from google.appengine.api.urlfetch_errors import ResponseTooLargeError, DeadlineExceededError

GS_PICTURES_BUCKET = 's-pictures/'
GS_FULL = 'http://commondatastorage.googleapis.com/'
GS_FULL_PICTURES = GS_FULL + GS_PICTURES_BUCKET
GS_PATH = '/gs/'
GS_PICTURES_PATH = GS_PATH + GS_PICTURES_BUCKET


def create_gs(url, name, mime='application/octet-stream'):
    try:
        result = urlfetch.fetch(url, deadline=30)
    except ResponseTooLargeError:
        logging.warning("u fetch fail for %s" % url)
        return None
    except DeadlineExceededError:
        return create_gs(url, name, mime)
        # Create a file that writes to Cloud Storage and is readable by everyone
    # in the project.
    write_path = files.gs.create(GS_PICTURES_PATH + name, mime_type=mime, acl='public-read')
    # Write to the file.
    with files.open(write_path, 'a') as fp:
        fp.write(result.content)

    # Finalize the file so it is readable in Google Cloud Storage.
    files.finalize(write_path)
    return GS_FULL_PICTURES + name