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# ================================================================================
# Copyright (c) 2019-2020 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# 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.
# ============LICENSE_END=========================================================
"""generic class to keep track of app health"""
import uuid
from datetime import datetime
from threading import Lock
class HealthStats(object):
"""keep track of stats for calls"""
def __init__(self, name):
"""keep track of stats for metrics calls"""
self._name = name or "stats_" + str(uuid.uuid4())
self._lock = Lock()
self._call_count = 0
self._error_count = 0
self._longest_timer = 0
self._total_timer = 0
self._last_success = None
self._last_error = None
def dump(self):
"""returns dict of stats"""
dump = None
with self._lock:
dump = {
"call_count" : self._call_count,
"error_count" : self._error_count,
"last_success" : str(self._last_success),
"last_error" : str(self._last_error),
"longest_timer_millisecs" : self._longest_timer,
"ave_timer_millisecs" : (float(self._total_timer)/self._call_count \
if self._call_count else 0)
}
return dump
def success(self, timer):
"""records the successful execution"""
with self._lock:
self._call_count += 1
self._last_success = datetime.now()
self._total_timer += timer
if not self._longest_timer or self._longest_timer < timer:
self._longest_timer = timer
def error(self, timer):
"""records the errored execution"""
with self._lock:
self._call_count += 1
self._error_count += 1
self._last_error = datetime.now()
self._total_timer += timer
if not self._longest_timer or self._longest_timer < timer:
self._longest_timer = timer
class Health(object):
"""Health stats for multiple requests"""
def __init__(self):
"""Health stats for application"""
self._all_stats = {}
self._lock = Lock()
def _add_or_get_stats(self, stats_name):
"""add to or get from the ever growing dict of HealthStats"""
stats = None
with self._lock:
stats = self._all_stats.get(stats_name)
if not stats:
self._all_stats[stats_name] = stats = HealthStats(stats_name)
return stats
def success(self, stats_name, timer):
"""records the successful execution on stats_name"""
stats = self._add_or_get_stats(stats_name)
stats.success(timer)
def error(self, stats_name, timer):
"""records the error execution on stats_name"""
stats = self._add_or_get_stats(stats_name)
stats.error(timer)
def dump(self):
"""returns dict of stats"""
with self._lock:
stats = dict((k, v.dump()) for (k, v) in self._all_stats.items())
return stats
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