def shuffle_partial_view(self):
logger.debug("Shuffling", partialView=self.partialView)
# 1) Increase by one the age of all neighbors
logger.debug("Increase by one the age of all neighbors.")
self.partialView.increment()
logger.debug("Increment", partialView=self.partialView)
# 2) Select neighbor Q with the highest age among all neighbors.
logger.debug(
"Select neighbor Q with the highest age among all neighbors.")
oldest_peer = self.partialView.get_oldest_peer()
logger.debug("SelectOldest", oldest_peer=oldest_peer)
# 3) Select l - 1 other random neighbors (meaning avoid oldest).
logger.debug(
"Select l - 1 other random neighbors (meaning avoid oldest).")
neighbors = self.partialView.select_neighbors_for_request(oldest_peer)
logger.debug("SelectNeighbors", neighbors=neighbors)
# 4) Replace Q's entry with a new entry of age 0 and with P's address.
logger.debug(
"Replace Q's entry with a new entry of age 0 and with P's address."
)
neighbors.add_peer_ip(self.ip, allow_self_ip=True)
logger.debug("AddMyself", neighbors=neighbors)
try:
# 5) Send the updated subset to peer Q.
logger.debug("Send the updated subset to peer Q (oldest_peer).",
oldest_peer=oldest_peer.ip)
response = json.loads(
self.send_message(oldest_peer.ip, 'exchange-view', neighbors))
received_partial_view = PartialView.from_dict(response.get('data'))
logger.debug("Received",
received_partial_view=received_partial_view)
# 6) I remove the oldest peer from my view
logger.debug("I remove the oldest peer from my view.",
oldest_peer=oldest_peer.ip)
self.partialView.remove_peer(oldest_peer)
logger.debug("RemovedOldest", partialView=self.partialView)
# 7) I merge my view with the one just received
logger.debug("I merge my view with the one just received.")
self.partialView.merge(neighbors, received_partial_view)
logger.debug("Merged", partialView=self.partialView)
except Timeout:
logger.error("TimeoutException: Request to " +
str(oldest_peer.ip) + " timed out.")
def test_unmarshal_partial_view(self):
for ip in self.ips:
self.partialView.add_peer_ip(ip)
jsonized = self.partialView.to_json()
partial_view = PartialView.from_dict(jsonized)
self.assertIsInstance(partial_view, PartialView)
for peer in partial_view.peer_list:
self.assertIsInstance(peer, PodDescriptor)
self.assertEqual(partial_view.ip, self.partialView.ip)
self.assertEqual(partial_view.size, 3)
self.assertEqual(partial_view.limit, 3)
for i in range(self.partialView.limit):
self.assertEqual(partial_view.peer_list[i].ip,
self.descriptors[i].ip)
self.assertEqual(partial_view.peer_list[i].age,
self.descriptors[i].age)
def exchange_view(request):
if request.method == 'POST':
logger.info("ExchangeView")
logger.debug("ExchangeView",
request=request,
partialView=cyclon.partialView)
# 1) I cast the received json into a PartialView
logger.debug(
"ExchangeView: I cast the received json into a PartialView.")
message = json.loads(request.body)
received_partial_view = PartialView.from_dict(message.get('data'))
# 2) I send a subset of my partial view no matter if the source ip is contained in it
logger.debug(
"ExchangeView: I send a subset of my partial view no matter if the source ip is contained in it."
)
to_send = cyclon.partialView.select_neighbors_for_reply()
# 3) I merge current partial view with the one just received
logger.debug(
"ExchangeView: I merge current partial view with the one just received."
)
cyclon.partialView.merge(to_send, received_partial_view)
logger.debug("ExchangeView", partialView=cyclon.partialView)
m = Message(format_address(my_ip(), 5000), message.get('source'),
to_send)
logger.debug("ExchangeView",
response=m.to_json(),
to=message.get('source'))
return JsonResponse(m.to_json())
else:
return JsonResponse(
{"error": {
"message": "Only the POST method is allowed."
}},
status=403)