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from landscape.lib.fetch import fetch_async EC2_HOST = "169.254.169.254" EC2_API = "http://%s/latest" % (EC2_HOST,) MAX_LENGTH = 64 def fetch_ec2_meta_data(fetch=None): """Fetch EC2 information about the cloud instance. The fetch parameter provided above is for non-mocked testing purposes. """ cloud_data = [] # We're not using a DeferredList here because we want to keep the # number of connections to the backend minimal. See lp:567515. deferred = _fetch_ec2_item("instance-id", cloud_data, fetch) deferred.addCallback( lambda ignore: _fetch_ec2_item("instance-type", cloud_data, fetch)) deferred.addCallback( lambda ignore: _fetch_ec2_item("ami-id", cloud_data, fetch)) def return_result(ignore): """Record the instance data returned by the EC2 API.""" def _process_result(value): if value is not None: if isinstance(value, bytes): value = value.decode("utf-8") return value[:MAX_LENGTH] (instance_id, instance_type, ami_id) = cloud_data return { "instance-id": _process_result(instance_id), "ami-id": _process_result(ami_id), "instance-type": _process_result(instance_type)} deferred.addCallback(return_result) return deferred def _fetch_ec2_item(path, accumulate, fetch=None): """ Get data at C{path} on the EC2 API endpoint, and add the result to the C{accumulate} list. The C{fetch} parameter is provided for testing only. """ url = EC2_API + "/meta-data/" + path if fetch is None: fetch = fetch_async return fetch(url, follow=False).addCallback(accumulate.append)