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# Copyright 2022-2023 ETSI TeraFlowSDN - TFS OSG (https://tfs.etsi.org/)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
def compute_delta_sample(previous_sample, previous_timestamp, current_sample, current_timestamp):
if previous_sample is None: return None
if previous_timestamp is None: return None
if current_sample is None: return None
if current_timestamp is None: return None
delay = current_timestamp - previous_timestamp
field_keys = set(previous_sample.keys()).union(current_sample.keys())
field_keys.discard('name')
delta_sample = {'name': previous_sample['name']}
for field_key in field_keys:
previous_sample_value = previous_sample[field_key]
if not isinstance(previous_sample_value, (int, float)): continue
current_sample_value = current_sample[field_key]
if not isinstance(current_sample_value, (int, float)): continue
delta_value = current_sample_value - previous_sample_value
if delta_value < 0: continue
delta_sample[field_key] = delta_value / delay
return delta_sample
class SamplesCache:
def __init__(self, netconf_handler : NetconfSessionHandler) -> None:
self.__netconf_handler = netconf_handler
self.__lock = threading.Lock()
self.__timestamp = None
self.__absolute_samples = {}
self.__delta_samples = {}
def _refresh_samples(self) -> None:
with self.__lock:
try:
now = datetime.timestamp(datetime.utcnow())
if self.__timestamp is not None and (now - self.__timestamp) < SAMPLE_EVICTION_SECONDS: return
str_filter = get_filter(SAMPLE_RESOURCE_KEY)
xml_data = self.__netconf_handler.get(filter=str_filter).data_ele
interface_samples = parse(SAMPLE_RESOURCE_KEY, xml_data)
for interface,samples in interface_samples:
match = RE_GET_ENDPOINT_FROM_INTERFACE_KEY.match(interface)
if match is None: continue
interface = match.group(1)
delta_sample = compute_delta_sample(
self.__absolute_samples.get(interface), self.__timestamp, samples, now)
if delta_sample is not None: self.__delta_samples[interface] = delta_sample
self.__absolute_samples[interface] = samples
self.__timestamp = now
except: # pylint: disable=bare-except
LOGGER.exception('Error collecting samples')
def get(self, resource_key : str) -> Tuple[float, Dict]:
self._refresh_samples()
match = RE_GET_ENDPOINT_FROM_INTERFACE_XPATH.match(resource_key)
with self.__lock:
if match is None: return self.__timestamp, {}
interface = match.group(1)
return self.__timestamp, copy.deepcopy(self.__delta_samples.get(interface, {}))