summaryrefslogtreecommitdiffstats
path: root/policyhandler/onap/health.py
blob: eefa7d2da8f4606d1b727bc4defab15c89dded06 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
"""generic class to keep track of app health"""

# org.onap.dcae
# ================================================================================
# Copyright (c) 2017 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=========================================================
#
# ECOMP is a trademark and service mark of AT&T Intellectual Property.

import uuid
from threading import Lock
from datetime import datetime

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.iteritems())

        return stats