Code Examples

The Python Downloader has two architectural pieces. The first are a set of methods to manipulate metadata about files and generate a Cartd friendly metadata document. The second is a set of methods to interact with the Cartd service to wait and download the files.

Download Transaction Info

The download setup described below creates a temporary directory to download the data to.

from tempfile import mkdtemp

down_path = mkdtemp()
down = Downloader(cart_api_url='')
resp = requests.get('')
assert resp.status_code == 200
down.transactioninfo(down_path, resp.json())

Download Cloud Event

Often CloudEvents are handled in web server frameworks. Here’s an example of using the downloader in CherryPy. This example can be launched as a consumer of CloudEvents sent by the Pacifica Notifications service.

from tempfile import mkdtemp
import cherrypy

class Root(object):
    exposed = True
    def POST(self):
        """Accept the cloud event data and return the local download path."""
        down_path = mkdtemp()
        down = Downloader(cart_api_url='')
        down.cloudevent(down_path, cherrpy.request.json)
        return { 'download_path': down_path }

cherrypy.quickstart(Root(), '/', {
    '/': {
        'request.dispatch': cherrypy.dispatch.MethodDispatcher()