def _fetch_data(self, uri, cursor, page_size):
# If not cursor there is nothing to retrieve
if cursor:
if cursor == "start":
cursor = None
# Chunk size tuning might, in some conditions, make it larger
# than 5,000, which is the maximum page size allowed by the NVP
# API. In this case the request should be split in multiple
# requests. This is not ideal, and therefore a log warning will
# be emitted.
num_requests = page_size / (MAX_PAGE_SIZE + 1) + 1
if num_requests > 1:
LOG.warn(
_(
"Requested page size is %(cur_chunk_size)d."
"It might be necessary to do %(num_requests)d "
"round-trips to NVP for fetching data. Please "
"tune sync parameters to ensure chunk size "
"is less than %(max_page_size)d"
),
{"cur_chunk_size": page_size, "num_requests": num_requests, "max_page_size": MAX_PAGE_SIZE},
)
# Only the first request might return the total size,
# subsequent requests will definetely not
results, cursor, total_size = nsxlib.get_single_query_page(
uri, self._cluster, cursor, min(page_size, MAX_PAGE_SIZE)
)
for _req in range(num_requests - 1):
# If no cursor is returned break the cycle as there is no
# actual need to perform multiple requests (all fetched)
# This happens when the overall size of resources exceeds
# the maximum page size, but the number for each single
# resource type is below this threshold
if not cursor:
break
req_results, cursor = nsxlib.get_single_query_page(
uri, self._cluster, cursor, min(page_size, MAX_PAGE_SIZE)
)[:2]
results.extend(req_results)
# reset cursor before returning if we queried just to
# know the number of entities
return results, cursor if page_size else "start", total_size
return [], cursor, None
def _fetch_data(self, uri, cursor, page_size):
# If not cursor there is nothing to retrieve
if cursor:
if cursor == 'start':
cursor = None
# Chunk size tuning might, in some conditions, make it larger
# than 5,000, which is the maximum page size allowed by the NSX
# API. In this case the request should be split in multiple
# requests. This is not ideal, and therefore a log warning will
# be emitted.
num_requests = page_size / (MAX_PAGE_SIZE + 1) + 1
if num_requests > 1:
LOG.warn(
_("Requested page size is %(cur_chunk_size)d."
"It might be necessary to do %(num_requests)d "
"round-trips to NSX for fetching data. Please "
"tune sync parameters to ensure chunk size "
"is less than %(max_page_size)d"), {
'cur_chunk_size': page_size,
'num_requests': num_requests,
'max_page_size': MAX_PAGE_SIZE
})
# Only the first request might return the total size,
# subsequent requests will definetely not
results, cursor, total_size = nsxlib.get_single_query_page(
uri, self._cluster, cursor, min(page_size, MAX_PAGE_SIZE))
for _req in range(num_requests - 1):
# If no cursor is returned break the cycle as there is no
# actual need to perform multiple requests (all fetched)
# This happens when the overall size of resources exceeds
# the maximum page size, but the number for each single
# resource type is below this threshold
if not cursor:
break
req_results, cursor = nsxlib.get_single_query_page(
uri, self._cluster, cursor, min(page_size,
MAX_PAGE_SIZE))[:2]
results.extend(req_results)
# reset cursor before returning if we queried just to
# know the number of entities
return results, cursor if page_size else 'start', total_size
return [], cursor, None
